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| author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-09-01 19:57:37 +0900 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-09-16 12:23:56 -0400 |
| commit | f219e01311b27b9c723e4f94aa6c3b51de9c0cd9 (patch) | |
| tree | 2122b450f28c80279ad3bbf057e1396e931b441a /tools | |
| parent | c25a1784d022b8b8b82ec7e1bc28716c213ce80c (diff) | |
| download | u-boot-imx-f219e01311b27b9c723e4f94aa6c3b51de9c0cd9.zip u-boot-imx-f219e01311b27b9c723e4f94aa6c3b51de9c0cd9.tar.gz u-boot-imx-f219e01311b27b9c723e4f94aa6c3b51de9c0cd9.tar.bz2 | |
tools: Import Kconfiglib
Kconfiglib is the flexible Python Kconfig parser and library
created by Ulf Magnusson.
(https://github.com/ulfalizer/Kconfiglib)
This commit imports kconfiglib.py from
commit ce84c22e58fa59cb93679d4ead03c3cd1387965e,
with ISC SPDX-License-Identifier.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Cc: Ulf Magnusson <ulfalizer@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/buildman/kconfiglib.py | 3799 |
1 files changed, 3799 insertions, 0 deletions
diff --git a/tools/buildman/kconfiglib.py b/tools/buildman/kconfiglib.py new file mode 100644 index 0000000..31fd3c9 --- /dev/null +++ b/tools/buildman/kconfiglib.py @@ -0,0 +1,3799 @@ +# +# SPDX-License-Identifier: GPL-2.0+ +# +# Author: Ulf Magnusson +# https://github.com/ulfalizer/Kconfiglib + +# This is Kconfiglib, a Python library for scripting, debugging, and extracting +# information from Kconfig-based configuration systems. To view the +# documentation, run +# +# $ pydoc kconfiglib +# +# or, if you prefer HTML, +# +# $ pydoc -w kconfiglib +# +# The examples/ subdirectory contains examples, to be run with e.g. +# +# $ make scriptconfig SCRIPT=Kconfiglib/examples/print_tree.py +# +# Look in testsuite.py for the test suite. + +""" +Kconfiglib is a Python library for scripting and extracting information from +Kconfig-based configuration systems. Features include the following: + + - Symbol values and properties can be looked up and values assigned + programmatically. + - .config files can be read and written. + - Expressions can be evaluated in the context of a Kconfig configuration. + - Relations between symbols can be quickly determined, such as finding all + symbols that reference a particular symbol. + - Highly compatible with the scripts/kconfig/*conf utilities. The test suite + automatically compares outputs between Kconfiglib and the C implementation + for a large number of cases. + +For the Linux kernel, scripts are run using + + $ make scriptconfig SCRIPT=<path to script> [SCRIPT_ARG=<arg>] + +Running scripts via the 'scriptconfig' target ensures that required environment +variables (SRCARCH, ARCH, srctree, KERNELVERSION, etc.) are set up correctly. +Alternative architectures can be specified like for other 'make *config' +targets: + + $ make scriptconfig ARCH=mips SCRIPT=<path to script> [SCRIPT_ARG=<arg>] + +The script will receive the name of the Kconfig file to load in sys.argv[1]. +(As of Linux 3.7.0-rc8 this is always "Kconfig" from the kernel top-level +directory.) If an argument is provided with SCRIPT_ARG, it will appear in +sys.argv[2]. + +To get an interactive Python prompt with Kconfiglib preloaded and a Config +object 'c' created, use + + $ make iscriptconfig [ARCH=<architecture>] + +Kconfiglib requires Python 2. For (i)scriptconfig the command to run the Python +interpreter can be passed in the environment variable PYTHONCMD (defaults to +'python'; PyPy works too and is a bit faster). + +Look in the examples/ subdirectory for examples, which can be run with e.g. + + $ make scriptconfig SCRIPT=Kconfiglib/examples/print_tree.py + +or + + $ make scriptconfig SCRIPT=Kconfiglib/examples/help_grep.py SCRIPT_ARG="kernel" + +Look in testsuite.py for the test suite. + +Credits: Written by Ulf "Ulfalizer" Magnusson + +Send bug reports, suggestions and other feedback to kconfiglib@gmail.com . +Don't wrestle with internal APIs. Tell me what you need and I might add it in a +safe way as a client API instead.""" + +# If you have Psyco installed (32-bit installations, Python <= 2.6 only), +# setting this to True (right here, not at runtime) might give a nice speedup. +# (22% faster for parsing arch/x86/Kconfig and 58% faster for evaluating all +# symbols in it without a .config on my Core Duo.) +use_psyco = False + +import os +import re +import string +import sys + +class Config(): + + """Represents a Kconfig configuration, e.g. for i386 or ARM. This is the + set of symbols and other items appearing in the configuration together with + their values. Creating any number of Config objects -- including for + different architectures -- is safe; Kconfiglib has no global state.""" + + # + # Public interface + # + + def __init__(self, + filename = "Kconfig", + base_dir = "$srctree", + print_warnings = True, + print_undef_assign = False): + """Creates a new Config object, representing a Kconfig configuration. + Raises Kconfig_Syntax_Error on syntax errors. + + filename (default: "Kconfig") -- The base Kconfig file of the + configuration. For the Linux kernel, this should usually be be + "Kconfig" from the top-level directory, as environment + variables will make sure the right Kconfig is included from + there (usually arch/<architecture>/Kconfig). If you are using + kconfiglib via 'make scriptconfig' the filename of the + correct Kconfig will be in sys.argv[1]. + + base_dir (default: "$srctree") -- The base directory relative to which + 'source' statements within Kconfig files will work. For the + Linux kernel this should be the top-level directory of the + kernel tree. $-references to environment variables will be + expanded. + + The environment variable 'srctree' is set by the Linux makefiles + to the top-level kernel directory. A default of "." would not + work if an alternative build directory is used. + + print_warnings (default: True) -- Set to True if warnings related to + this configuration should be printed to stderr. This can + be changed later with Config.set_print_warnings(). It is + provided as a constructor argument since warnings might + be generated during parsing. + + print_undef_assign (default: False) -- Set to True if informational + messages related to assignments to undefined symbols + should be printed to stderr for this configuration. + Can be changed later with + Config.set_print_undef_assign().""" + + # The set of all symbols, indexed by name (a string) + self.syms = {} + + # The set of all defined symbols in the configuration in the order they + # appear in the Kconfig files. This excludes the special symbols n, m, + # and y as well as symbols that are referenced but never defined. + self.kconfig_syms = [] + + # The set of all named choices (yes, choices can have names), indexed + # by name (a string) + self.named_choices = {} + + def register_special_symbol(type, name, value): + sym = Symbol() + sym.is_special_ = True + sym.is_defined_ = True + sym.config = self + sym.name = name + sym.type = type + sym.cached_value = value + self.syms[name] = sym + return sym + + # The special symbols n, m and y, used as shorthand for "n", "m" and + # "y" + self.n = register_special_symbol(TRISTATE, "n", "n") + self.m = register_special_symbol(TRISTATE, "m", "m") + self.y = register_special_symbol(TRISTATE, "y", "y") + + # DEFCONFIG_LIST uses this + register_special_symbol(STRING, "UNAME_RELEASE", os.uname()[2]) + + # The symbol with "option defconfig_list" set, containing a list of + # default .config files + self.defconfig_sym = None + + # See Symbol.get_(src)arch() + self.arch = os.environ.get("ARCH") + self.srcarch = os.environ.get("SRCARCH") + + # See Config.__init__(). We need this for get_defconfig_filename(). + self.srctree = os.environ.get("srctree") + if self.srctree is None: + self.srctree = "." + + self.filename = filename + self.base_dir = _strip_trailing_slash(os.path.expandvars(base_dir)) + + # The 'mainmenu' text + self.mainmenu_text = None + + # The filename of the most recently loaded .config file + self.config_filename = None + + # The textual header of the most recently loaded .config, uncommented + self.config_header = None + + self.print_warnings = print_warnings + self.print_undef_assign = print_undef_assign + + # Lists containing all choices, menus and comments in the configuration + + self.choices = [] + self.menus = [] + self.comments = [] + + # For parsing routines that stop when finding a line belonging to a + # different construct, these holds that line and the tokenized version + # of that line. The purpose is to avoid having to re-tokenize the line, + # which is inefficient and causes problems when recording references to + # symbols. + self.end_line = None + self.end_line_tokens = None + + # See the comment in _parse_expr(). + self.parse_expr_cur_sym_or_choice = None + self.parse_expr_line = None + self.parse_expr_filename = None + self.parse_expr_linenr = None + self.parse_expr_transform_m = None + + # Parse the Kconfig files + self.top_block = self._parse_file(filename, None, None, None) + + # Build Symbol.dep for all symbols + self._build_dep() + + def load_config(self, filename, replace = True): + """Loads symbol values from a file in the familiar .config format. + Equivalent to calling Symbol.set_user_value() to set each of the + values. + + filename -- The .config file to load. $-references to environment + variables will be expanded. For scripts to work even + when an alternative build directory is used with the + Linux kernel, you need to refer to the top-level kernel + directory with "$srctree". + + replace (default: True) -- True if the configuration should replace + the old configuration; False if it should add to it.""" + + def warn_override(filename, linenr, name, old_user_val, new_user_val): + self._warn("overriding the value of {0}. " + 'Old value: "{1}", new value: "{2}".' + .format(name, old_user_val, new_user_val), + filename, + linenr) + + filename = os.path.expandvars(filename) + + # Put this first so that a missing file doesn't screw up our state + line_feeder = _FileFeed(_get_lines(filename), filename) + + self.config_filename = filename + + # Invalidate everything. This is usually faster than finding the + # minimal set of symbols that needs to be invalidated, as nearly all + # symbols will tend to be affected anyway. + if replace: + self.unset_user_values() + else: + self._invalidate_all() + + # Read header + + self.config_header = None + + def is_header_line(line): + return line.startswith("#") and \ + not unset_re.match(line) + + first_line = line_feeder.get_next() + + if first_line is None: + return + + if not is_header_line(first_line): + line_feeder.go_back() + else: + self.config_header = first_line[1:] + + # Read remaining header lines + while 1: + line = line_feeder.get_next() + + if line is None: + break + + if not is_header_line(line): + line_feeder.go_back() + break + + self.config_header += line[1:] + + # Remove trailing newline + if self.config_header.endswith("\n"): + self.config_header = self.config_header[:-1] + + # Read assignments + + filename = line_feeder.get_filename() + + while 1: + line = line_feeder.get_next() + if line is None: + return + + linenr = line_feeder.get_linenr() + + line = line.strip() + + set_re_match = set_re.match(line) + if set_re_match: + name, val = set_re_match.groups() + # The unescaping producedure below should be safe since " can + # only appear as \" inside the string + val = _strip_quotes(val, line, filename, linenr)\ + .replace('\\"', '"').replace("\\\\", "\\") + if name in self.syms: + sym = self.syms[name] + + old_user_val = sym.user_val + if old_user_val is not None: + warn_override(filename, linenr, name, old_user_val, val) + + if sym.is_choice_symbol_: + user_mode = sym.parent.user_mode + if user_mode is not None and user_mode != val: + self._warn("assignment to {0} changes mode of containing " + 'choice from "{1}" to "{2}".' + .format(name, val, user_mode), + filename, + linenr) + + sym._set_user_value_no_invalidate(val, True) + + else: + self._undef_assign('attempt to assign the value "{0}" to the ' + "undefined symbol {1}." + .format(val, name), + filename, + linenr) + + else: + unset_re_match = unset_re.match(line) + if unset_re_match: + name = unset_re_match.group(1) + if name in self.syms: + sym = self.syms[name] + + old_user_val = sym.user_val + if old_user_val is not None: + warn_override(filename, linenr, name, old_user_val, "n") + + sym._set_user_value_no_invalidate("n", True) + + def write_config(self, filename, header = None): + """Writes out symbol values in the familiar .config format. + + filename -- The filename under which to save the configuration. + + header (default: None) -- A textual header that will appear at the + beginning of the file, with each line commented out + automatically. None means no header.""" + + # already_written is set when _make_conf() is called on a symbol, so + # that symbols defined in multiple locations only get one entry in the + # .config. We need to reset it prior to writing out a new .config. + for sym in self.syms.itervalues(): + sym.already_written = False + + with open(filename, "w") as f: + # Write header + if header is not None: + f.write(_comment(header)) + f.write("\n") + + # Write configuration. + # (You'd think passing a list around to all the nodes and appending + # to it to avoid copying would be faster, but it's actually a lot + # slower with PyPy, and about as fast with Python. Passing the file + # around is slower too.) + f.write("\n".join(self.top_block._make_conf())) + f.write("\n") + + def get_kconfig_filename(self): + """Returns the name of the (base) kconfig file this configuration was + loaded from.""" + return self.filename + + def get_arch(self): + """Returns the value the environment variable ARCH had at the time the + Config instance was created, or None if ARCH was not set. For the + kernel, this corresponds to the architecture being built for, with + values such as "i386" or "mips".""" + return self.arch + + def get_srcarch(self): + """Returns the value the environment variable SRCARCH had at the time + the Config instance was created, or None if SRCARCH was not set. For + the kernel, this corresponds to the arch/ subdirectory containing + architecture-specific source code.""" + return self.srcarch + + def get_srctree(self): + """Returns the value the environment variable srctree had at the time + the Config instance was created, or None if srctree was not defined. + This variable points to the source directory and is used when building + in a separate directory.""" + return self.srctree + + def get_config_filename(self): + """Returns the name of the most recently loaded configuration file, or + None if no configuration has been loaded.""" + return self.config_filename + + def get_mainmenu_text(self): + """Returns the text of the 'mainmenu' statement (with $-references to + symbols replaced by symbol values), or None if the configuration has no + 'mainmenu' statement.""" + return None if self.mainmenu_text is None else \ + self._expand_sym_refs(self.mainmenu_text) + + def get_defconfig_filename(self): + """Returns the name of the defconfig file, which is the first existing + file in the list given in a symbol having 'option defconfig_list' set. + $-references to symbols will be expanded ("$FOO bar" -> "foo bar" if + FOO has the value "foo"). Returns None in case of no defconfig file. + Setting 'option defconfig_list' on multiple symbols currently results + in undefined behavior. + + If the environment variable 'srctree' was set when the Config was + created, get_defconfig_filename() will first look relative to that + directory before looking in the current directory; see + Config.__init__().""" + + if self.defconfig_sym is None: + return None + + for (filename, cond_expr) in self.defconfig_sym.def_exprs: + if self._eval_expr(cond_expr) == "y": + filename = self._expand_sym_refs(filename) + + # We first look in $srctree. os.path.join() won't work here as + # an absolute path in filename would override $srctree. + srctree_filename = os.path.normpath(self.srctree + "/" + filename) + if os.path.exists(srctree_filename): + return srctree_filename + + if os.path.exists(filename): + return filename + + return None + + def get_symbol(self, name): + """Returns the symbol with name 'name', or None if no such symbol + appears in the configuration. An alternative shorthand is conf[name], + where conf is a Config instance, though that will instead raise + KeyError if the symbol does not exist.""" + return self.syms.get(name) + + def get_top_level_items(self): + """Returns a list containing the items (symbols, menus, choice + statements and comments) at the top level of the configuration -- that + is, all items that do not appear within a menu or choice. The items + appear in the same order as within the configuration.""" + return self.top_block.get_items() + + def get_symbols(self, all_symbols = True): + """Returns a list of symbols from the configuration. An alternative for + iterating over all defined symbols (in the order of definition) is + + for sym in config: + ... + + which relies on Config implementing __iter__() and is equivalent to + + for sym in config.get_symbols(False): + ... + + all_symbols (default: True) -- If True, all symbols - including special + and undefined symbols - will be included in the result, in + an undefined order. If False, only symbols actually defined + and not merely referred to in the configuration will be + included in the result, and will appear in the order that + they are defined within the Kconfig configuration files.""" + return self.syms.values() if all_symbols else self.kconfig_syms + + def get_choices(self): + """Returns a list containing all choice statements in the + configuration, in the order they appear in the Kconfig files.""" + return self.choices + + def get_menus(self): + """Returns a list containing all menus in the configuration, in the + order they appear in the Kconfig files.""" + return self.menus + + def get_comments(self): + """Returns a list containing all comments in the configuration, in the + order they appear in the Kconfig files.""" + return self.comments + + def eval(self, s): + """Returns the value of the expression 's' -- where 's' is represented + as a string -- in the context of the configuration. Raises + Kconfig_Syntax_Error if syntax errors are detected in 's'. + + For example, if FOO and BAR are tristate symbols at least one of which + has the value "y", then config.eval("y && (FOO || BAR)") => "y" + + This functions always yields a tristate value. To get the value of + non-bool, non-tristate symbols, use Symbol.get_value(). + + The result of this function is consistent with how evaluation works for + conditional expressions in the configuration as well as in the C + implementation. "m" and m are rewritten as '"m" && MODULES' and 'm && + MODULES', respectively, and a result of "m" will get promoted to "y" if + we're running without modules.""" + return self._eval_expr(self._parse_expr(self._tokenize(s, True), # Feed + None, # Current symbol or choice + s)) # line + + def get_config_header(self): + """Returns the (uncommented) textual header of the .config file most + recently loaded with load_config(). Returns None if no .config file has + been loaded or if the most recently loaded .config file has no header. + The header comprises all lines up to but not including the first line + that either + + 1. Does not start with "#" + 2. Has the form "# CONFIG_FOO is not set." + """ + return self.config_header + + def get_base_dir(self): + """Returns the base directory relative to which 'source' statements + will work, passed as an argument to Config.__init__().""" + return self.base_dir + + def set_print_warnings(self, print_warnings): + """Determines whether warnings related to this configuration (for + things like attempting to assign illegal values to symbols with + Symbol.set_user_value()) should be printed to stderr. + + print_warnings -- True if warnings should be + printed, otherwise False.""" + self.print_warnings = print_warnings + + def set_print_undef_assign(self, print_undef_assign): + """Determines whether informational messages related to assignments to + undefined symbols should be printed to stderr for this configuration. + + print_undef_assign -- If True, such messages will be printed.""" + self.print_undef_assign = print_undef_assign + + def __getitem__(self, key): + """Returns the symbol with name 'name'. Raises KeyError if the symbol + does not appear in the configuration.""" + return self.syms[key] + + def __iter__(self): + """Convenience function for iterating over the set of all defined + symbols in the configuration, used like + + for sym in conf: + ... + + The iteration happens in the order of definition within the Kconfig + configuration files. Symbols only referred to but not defined will not + be included, nor will the special symbols n, m, and y. If you want to + include such symbols as well, see config.get_symbols().""" + return iter(self.kconfig_syms) + + def unset_user_values(self): + """Resets the values of all symbols, as if Config.load_config() or + Symbol.set_user_value() had never been called.""" + for sym in self.syms.itervalues(): + sym._unset_user_value_no_recursive_invalidate() + + def __str__(self): + """Returns a string containing various information about the Config.""" + return _sep_lines("Configuration", + "File : " + self.filename, + "Base directory : " + self.base_dir, + "Value of $ARCH at creation time : " + + ("(not set)" if self.arch is None else self.arch), + "Value of $SRCARCH at creation time : " + + ("(not set)" if self.srcarch is None else self.srcarch), + "Source tree (derived from $srctree;", + "defaults to '.' if $srctree isn't set) : " + self.srctree, + "Most recently loaded .config : " + + ("(no .config loaded)" if self.config_filename is None else + self.config_filename), + "Print warnings : " + + bool_str[self.print_warnings], + "Print assignments to undefined symbols : " + + bool_str[self.print_undef_assign]) + + + # + # Private methods + # + + def _invalidate_all(self): + for sym in self.syms.itervalues(): + sym._invalidate() + + def _tokenize(self, + s, + for_eval = False, + filename = None, + linenr = None): + """Returns a _Feed instance containing tokens derived from the string + 's'. Registers any new symbols encountered (via _sym_lookup()). + + (I experimented with a pure regular expression implementation, but it + came out slower, less readable, and wouldn't have been as flexible.) + + for_eval -- True when parsing an expression for a call to + Config.eval(), in which case we should not treat the first + token specially nor register new symbols.""" + s = s.lstrip() + if s == "" or s[0] == "#": + return _Feed([]) + + if for_eval: + i = 0 # The current index in the string being tokenized + previous = None # The previous token seen + tokens = [] + else: + # The initial word on a line is parsed specially. Let + # command_chars = [A-Za-z0-9_]. Then + # - leading non-command_chars characters on the line are ignored, and + # - the first token consists the following one or more command_chars + # characters. + # This is why things like "----help--" are accepted. + + initial_token_match = initial_token_re.match(s) + if initial_token_match is None: + return _Feed([]) + # The current index in the string being tokenized + i = initial_token_match.end() + + keyword = keywords.get(initial_token_match.group(1)) + if keyword is None: + # We expect a keyword as the first token + _tokenization_error(s, len(s), filename, linenr) + if keyword == T_HELP: + # Avoid junk after "help", e.g. "---", being registered as a + # symbol + return _Feed([T_HELP]) + tokens = [keyword] + previous = keyword + + # _tokenize() is a hotspot during parsing, and this speeds things up a + # bit + strlen = len(s) + append = tokens.append + + # Main tokenization loop. (Handles tokens past the first one.) + while i < strlen: + # Test for an identifier/keyword preceded by whitespace first; this + # is the most common case. + id_keyword_match = id_keyword_re.match(s, i) + if id_keyword_match: + # We have an identifier or keyword. The above also stripped any + # whitespace for us. + name = id_keyword_match.group(1) + # Jump past it + i = id_keyword_match.end() + + # Keyword? + keyword = keywords.get(name) + if keyword is not None: + append(keyword) + # What would ordinarily be considered a name is treated as a + # string after certain tokens. + elif previous in string_lex: + append(name) + else: + # We're dealing with a symbol. _sym_lookup() will take care + # of allocating a new Symbol instance if it's the first + # time we see it. + sym = self._sym_lookup(name, not for_eval) + + if previous == T_CONFIG or previous == T_MENUCONFIG: + # If the previous token is T_(MENU)CONFIG + # ("(menu)config"), we're tokenizing the first line of + # a symbol definition, and should remember this as a + # location where the symbol is defined. + sym.def_locations.append((filename, linenr)) + else: + # Otherwise, it's a reference to the symbol + sym.ref_locations.append((filename, linenr)) + + append(sym) + + else: + # This restrips whitespace that could have been stripped in the + # regex above, but it's worth it since identifiers/keywords are + # more common + s = s[i:].lstrip() + if s == "": + break + strlen = len(s) + i = 0 + c = s[0] + + # String literal (constant symbol) + if c == '"' or c == "'": + i += 1 + + if "\\" in s: + # Slow path: This could probably be sped up, but it's a + # very unusual case anyway. + quote = c + value = "" + while 1: + if i >= strlen: + _tokenization_error(s, strlen, filename, + linenr) + c = s[i] + if c == quote: + break + if c == "\\": + if i + 1 >= strlen: + _tokenization_error(s, strlen, filename, + linenr) + value += s[i + 1] + i += 2 + else: + value += c + i += 1 + i += 1 + append(value) + else: + # Fast path: If the string contains no backslashes (almost + # always) we can simply look for the matching quote. + end = s.find(c, i) + if end == -1: + _tokenization_error(s, strlen, filename, linenr) + append(s[i:end]) + i = end + 1 + + elif c == "&": + if i + 1 >= strlen: + # Invalid characters are ignored + continue + if s[i + 1] != "&": + # Invalid characters are ignored + i += 1 + continue + append(T_AND) + i += 2 + + elif c == "|": + if i + 1 >= strlen: + # Invalid characters are ignored + continue + if s[i + 1] != "|": + # Invalid characters are ignored + i += 1 + continue + append(T_OR) + i += 2 + + elif c == "!": + if i + 1 >= strlen: + _tokenization_error(s, strlen, filename, linenr) + if s[i + 1] == "=": + append(T_UNEQUAL) + i += 2 + else: + append(T_NOT) + i += 1 + + elif c == "=": + append(T_EQUAL) + i += 1 + + elif c == "(": + append(T_OPEN_PAREN) + i += 1 + + elif c == ")": + append(T_CLOSE_PAREN) + i += 1 + + elif c == "#": + break + + else: + # Invalid characters are ignored + i += 1 + continue + + previous = tokens[-1] + + return _Feed(tokens) + + # + # Parsing + # + + # Expression grammar: + # + # <expr> -> <symbol> + # <symbol> '=' <symbol> + # <symbol> '!=' <symbol> + # '(' <expr> ')' + # '!' <expr> + # <expr> '&&' <expr> + # <expr> '||' <expr> + + def _parse_expr(self, + feed, + cur_sym_or_choice, + line, + filename = None, + linenr = None, + transform_m = True): + """Parse an expression from the tokens in 'feed' using a simple + top-down approach. The result has the form (<operator>, <list + containing parsed operands>). + + feed -- _Feed instance containing the tokens for the expression. + + cur_sym_or_choice -- The symbol or choice currently being parsed, or + None if we're not parsing a symbol or choice. + Used for recording references to symbols. + + line -- The line containing the expression being parsed. + + filename (default: None) -- The file containing the expression. + + linenr (default: None) -- The line number containing the expression. + + transform_m (default: False) -- Determines if 'm' should be rewritten to + 'm && MODULES' -- see + parse_val_and_cond().""" + + # Use instance variables to avoid having to pass these as arguments + # through the top-down parser in _parse_expr_2(), which is tedious and + # obfuscates the code. A profiler run shows no noticeable performance + # difference. + self.parse_expr_cur_sym_or_choice = cur_sym_or_choice + self.parse_expr_line = line + self.parse_expr_filename = filename + self.parse_expr_linenr = linenr + self.parse_expr_transform_m = transform_m + + return self._parse_expr_2(feed) + + def _parse_expr_2(self, feed): + or_terms = [self._parse_or_term(feed)] + # Keep parsing additional terms while the lookahead is '||' + while feed.check(T_OR): + or_terms.append(self._parse_or_term(feed)) + + return or_terms[0] if len(or_terms) == 1 else (OR, or_terms) + + def _parse_or_term(self, feed): + and_terms = [self._parse_factor(feed)] + # Keep parsing additional terms while the lookahead is '&&' + while feed.check(T_AND): + and_terms.append(self._parse_factor(feed)) + + return and_terms[0] if len(and_terms) == 1 else (AND, and_terms) + + def _parse_factor(self, feed): + if feed.check(T_OPEN_PAREN): + expr_parse = self._parse_expr_2(feed) + + if not feed.check(T_CLOSE_PAREN): + _parse_error(self.parse_expr_line, + "missing end parenthesis.", + self.parse_expr_filename, + self.parse_expr_linenr) + + return expr_parse + + if feed.check(T_NOT): + return (NOT, self._parse_factor(feed)) + + sym_or_string = feed.get_next() + + if not isinstance(sym_or_string, (Symbol, str)): + _parse_error(self.parse_expr_line, + "malformed expression.", + self.parse_expr_filename, + self.parse_expr_linenr) + + if self.parse_expr_cur_sym_or_choice is not None and \ + isinstance(sym_or_string, Symbol): + self.parse_expr_cur_sym_or_choice.referenced_syms.add(sym_or_string) + + next_token = feed.peek_next() + + # For conditional expressions ('depends on <expr>', '... if <expr>', + # etc.), "m" and m are rewritten to "m" && MODULES. + if next_token != T_EQUAL and next_token != T_UNEQUAL: + if self.parse_expr_transform_m and (sym_or_string is self.m or + sym_or_string == "m"): + return (AND, ["m", self._sym_lookup("MODULES")]) + return sym_or_string + + relation = EQUAL if (feed.get_next() == T_EQUAL) else UNEQUAL + sym_or_string_2 = feed.get_next() + + if self.parse_expr_cur_sym_or_choice is not None and \ + isinstance(sym_or_string_2, Symbol): + self.parse_expr_cur_sym_or_choice.referenced_syms.add(sym_or_string_2) + + if sym_or_string is self.m: + sym_or_string = "m" + + if sym_or_string_2 is self.m: + sym_or_string_2 = "m" + + return (relation, sym_or_string, sym_or_string_2) + + def _parse_file(self, filename, parent, deps, visible_if_deps, res = None): + """Parse the Kconfig file 'filename'. The result is a _Block with all + items from the file. See _parse_block() for the meaning of the + parameters.""" + line_feeder = _FileFeed(_get_lines(filename), filename) + return self._parse_block(line_feeder, None, parent, deps, visible_if_deps, res) + + def _parse_block(self, line_feeder, end_marker, parent, deps, + visible_if_deps = None, res = None): + """Parses a block, which is the contents of either a file or an if, + menu, or choice statement. The result is a _Block with the items from + the block. + + end_marker -- The token that ends the block, e.g. T_ENDIF ("endif") for + if's. None for files. + + parent -- The enclosing menu, choice or if, or None if we're at the top + level. + + deps -- Dependencies from enclosing menus, choices and if's. + + visible_if_deps (default: None) -- 'visible if' dependencies from + enclosing menus. + + res (default: None) -- The _Block to add items to. If None, a new + _Block is created to hold the items.""" + + block = _Block() if res is None else res + + filename = line_feeder.get_filename() + + while 1: + + # Do we already have a tokenized line that we determined wasn't + # part of whatever we were parsing earlier? See comment in + # Config.__init__(). + if self.end_line is not None: + assert self.end_line_tokens is not None + tokens = self.end_line_tokens + tokens.go_to_start() + + line = self.end_line + linenr = line_feeder.get_linenr() + + self.end_line = None + self.end_line_tokens = None + + else: + line = line_feeder.get_next() + if line is None: + if end_marker is not None: + raise Kconfig_Syntax_Error, ( + "Unexpected end of file {0}." + .format(line_feeder.get_filename())) + return block + + linenr = line_feeder.get_linenr() + + tokens = self._tokenize(line, False, filename, linenr) + + if tokens.is_empty(): + continue + + t0 = tokens.get_next() + + # Have we reached the end of the block? + if t0 == end_marker: + return block + + if t0 == T_CONFIG or t0 == T_MENUCONFIG: + # The tokenizer will automatically allocate a new Symbol object + # for any new names it encounters, so we don't need to worry + # about that here. + sym = tokens.get_next() + + # Symbols defined in multiple places get the parent of their + # first definition. However, for symbols whose parents are choice + # statements, the choice statement takes precedence. + if not sym.is_defined_ or isinstance(parent, Choice): + sym.parent = parent + + sym.is_defined_ = True + + self.kconfig_syms.append(sym) + block.add_item(sym) + + self._parse_properties(line_feeder, sym, deps, visible_if_deps) + + elif t0 == T_MENU: + menu = Menu() + self.menus.append(menu) + menu.config = self + menu.parent = parent + menu.title = tokens.get_next() + + menu.filename = filename + menu.linenr = linenr + + # Parse properties and contents + self._parse_properties(line_feeder, menu, deps, visible_if_deps) + menu.block = self._parse_block(line_feeder, + T_ENDMENU, + menu, + menu.dep_expr, + _make_and(visible_if_deps, + menu.visible_if_expr)) + + block.add_item(menu) + + elif t0 == T_IF: + # If statements are treated as syntactic sugar for adding + # dependencies to enclosed items and do not have an explicit + # object representation. + + dep_expr = self._parse_expr(tokens, None, line, filename, linenr) + self._parse_block(line_feeder, + T_ENDIF, + parent, + _make_and(dep_expr, deps), + visible_if_deps, + block) # Add items to the same block + + elif t0 == T_CHOICE: + # We support named choices + already_defined = False + name = None + if len(tokens) > 1 and isinstance(tokens[1], str): + name = tokens[1] + already_defined = name in self.named_choices + + if already_defined: + choice = self.named_choices[name] + else: + choice = Choice() + self.choices.append(choice) + if name is not None: + choice.name = name + self.named_choices[name] = choice + + choice.config = self + choice.parent = parent + + choice.def_locations.append((filename, linenr)) + + # Parse properties and contents + self._parse_properties(line_feeder, choice, deps, visible_if_deps) + choice.block = self._parse_block(line_feeder, + T_ENDCHOICE, + choice, + None, + visible_if_deps) + + choice._determine_actual_symbols() + + # If no type is set for the choice, its type is that of the first + # choice item + if choice.type == UNKNOWN: + for item in choice.get_symbols(): + if item.type != UNKNOWN: + choice.type = item.type + break + + # Each choice item of UNKNOWN type gets the type of the choice + for item in choice.get_symbols(): + if item.type == UNKNOWN: + item.type = choice.type + + # For named choices defined in multiple locations, only record + # at the first definition + if not already_defined: + block.add_item(choice) + + elif t0 == T_COMMENT: + comment = Comment() + comment.config = self + comment.parent = parent + + comment.filename = filename + comment.linenr = linenr + + comment.text = tokens.get_next() + self._parse_properties(line_feeder, comment, deps, visible_if_deps) + + block.add_item(comment) + self.comments.append(comment) + + elif t0 == T_SOURCE: + kconfig_file = tokens.get_next() + exp_kconfig_file = self._expand_sym_refs(kconfig_file) + f = os.path.join(self.base_dir, exp_kconfig_file) + + if not os.path.exists(f): + raise IOError, ('{0}:{1}: sourced file "{2}" (expands to\n' + '"{3}") not found. Perhaps base_dir\n' + '(argument to Config.__init__(), currently\n' + '"{4}") is set to the wrong value.' + .format(filename, + linenr, + kconfig_file, + exp_kconfig_file, + self.base_dir)) + + # Add items to the same block + self._parse_file(f, parent, deps, visible_if_deps, block) + + elif t0 == T_MAINMENU: + text = tokens.get_next() + + if self.mainmenu_text is not None: + self._warn("overriding 'mainmenu' text. " + 'Old value: "{0}", new value: "{1}".' + .format(self.mainmenu_text, text), + filename, + linenr) + + self.mainmenu_text = text + + else: + _parse_error(line, "unrecognized construct.", filename, linenr) + + def _parse_properties(self, line_feeder, stmt, deps, visible_if_deps): + """Parsing of properties for symbols, menus, choices, and comments.""" + + def parse_val_and_cond(tokens, line, filename, linenr): + """Parses '<expr1> if <expr2>' constructs, where the 'if' part is + optional. Returns a tuple containing the parsed expressions, with + None as the second element if the 'if' part is missing.""" + val = self._parse_expr(tokens, stmt, line, filename, linenr, False) + + if tokens.check(T_IF): + return (val, self._parse_expr(tokens, stmt, line, filename, linenr)) + + return (val, None) + + # In case the symbol is defined in multiple locations, we need to + # remember what prompts, defaults, and selects are new for this + # definition, as "depends on" should only apply to the local + # definition. + new_prompt = None + new_def_exprs = [] + new_selects = [] + + # Dependencies from 'depends on' statements + depends_on_expr = None + + while 1: + line = line_feeder.get_next() + if line is None: + break + + filename = line_feeder.get_filename() + linenr = line_feeder.get_linenr() + + tokens = self._tokenize(line, False, filename, linenr) + + if tokens.is_empty(): + continue + + t0 = tokens.get_next() + + if t0 == T_HELP: + # Find first non-empty line and get its indentation + + line_feeder.remove_while(str.isspace) + line = line_feeder.get_next() + + if line is None: + stmt.help = "" + break + + indent = _indentation(line) + + # If the first non-empty lines has zero indent, there is no + # help text + if indent == 0: + stmt.help = "" + line_feeder.go_back() + break + + help_lines = [_deindent(line, indent)] + + # The help text goes on till the first non-empty line with less + # indent + while 1: + line = line_feeder.get_next() + if (line is None) or \ + (not line.isspace() and _indentation(line) < indent): + stmt.help = "".join(help_lines) + break + + help_lines.append(_deindent(line, indent)) + + if line is None: + break + + line_feeder.go_back() + + elif t0 == T_PROMPT: + # 'prompt' properties override each other within a single + # definition of a symbol, but additional prompts can be added + # by defining the symbol multiple times; hence 'new_prompt' + # instead of 'prompt'. + new_prompt = parse_val_and_cond(tokens, line, filename, linenr) + + elif t0 == T_DEFAULT: + new_def_exprs.append(parse_val_and_cond(tokens, line, filename, linenr)) + + elif t0 == T_DEPENDS: + if not tokens.check(T_ON): + _parse_error(line, 'expected "on" after "depends".', filename, linenr) + + parsed_deps = self._parse_expr(tokens, stmt, line, filename, linenr) + + if isinstance(stmt, (Menu, Comment)): + stmt.dep_expr = _make_and(stmt.dep_expr, parsed_deps) + else: + depends_on_expr = _make_and(depends_on_expr, parsed_deps) + + elif t0 == T_VISIBLE: + if not tokens.check(T_IF): + _parse_error(line, 'expected "if" after "visible".', filename, linenr) + if not isinstance(stmt, Menu): + _parse_error(line, + "'visible if' is only valid for menus.", + filename, + linenr) + + parsed_deps = self._parse_expr(tokens, stmt, line, filename, linenr) + stmt.visible_if_expr = _make_and(stmt.visible_if_expr, parsed_deps) + + elif t0 == T_SELECT: + target = tokens.get_next() + + stmt.referenced_syms.add(target) + stmt.selected_syms.add(target) + + if tokens.check(T_IF): + new_selects.append((target, + self._parse_expr(tokens, stmt, line, filename, linenr))) + else: + new_selects.append((target, None)) + + elif t0 in (T_BOOL, T_TRISTATE, T_INT, T_HEX, T_STRING): + stmt.type = token_to_type[t0] + + if len(tokens) > 1: + new_prompt = parse_val_and_cond(tokens, line, filename, linenr) + + elif t0 == T_RANGE: + lower = tokens.get_next() + upper = tokens.get_next() + stmt.referenced_syms.add(lower) + stmt.referenced_syms.add(upper) + + if tokens.check(T_IF): + stmt.ranges.append((lower, upper, + self._parse_expr(tokens, stmt, line, filename, linenr))) + else: + stmt.ranges.append((lower, upper, None)) + + elif t0 == T_DEF_BOOL: + stmt.type = BOOL + + if len(tokens) > 1: + new_def_exprs.append(parse_val_and_cond(tokens, line, filename, linenr)) + + elif t0 == T_DEF_TRISTATE: + stmt.type = TRISTATE + + if len(tokens) > 1: + new_def_exprs.append(parse_val_and_cond(tokens, line, filename, linenr)) + + elif t0 == T_OPTIONAL: + if not isinstance(stmt, Choice): + _parse_error(line, + '"optional" is only valid for choices.', + filename, + linenr) + stmt.optional = True + + elif t0 == T_OPTION: + if tokens.check(T_ENV) and tokens.check(T_EQUAL): + env_var = tokens.get_next() + + stmt.is_special_ = True + stmt.is_from_env = True + + if env_var not in os.environ: + self._warn(""" +The symbol {0} references the non-existent environment variable {1} and will +get the empty string as its value. + +If you're using kconfiglib via 'make (i)scriptconfig' it should have set up the +environment correctly for you. If you still got this message, that might be an +error, and you should e-mail kconfiglib@gmail.com. +.""" .format(stmt.name, env_var), + filename, + linenr) + + stmt.cached_value = "" + else: + stmt.cached_value = os.environ[env_var] + + elif tokens.check(T_DEFCONFIG_LIST): + self.defconfig_sym = stmt + + elif tokens.check(T_MODULES): + self._warn("the 'modules' option is not supported. " + "Let me know if this is a problem for you; " + "it shouldn't be that hard to implement.", + filename, + linenr) + + else: + _parse_error(line, "unrecognized option.", filename, linenr) + + else: + # See comment in Config.__init__() + self.end_line = line + self.end_line_tokens = tokens + break + + # Propagate dependencies from enclosing menus and if's. + + # For menus and comments.. + if isinstance(stmt, (Menu, Comment)): + stmt.orig_deps = stmt.dep_expr + stmt.deps_from_containing = deps + stmt.dep_expr = _make_and(stmt.dep_expr, deps) + + stmt.all_referenced_syms = \ + stmt.referenced_syms | _get_expr_syms(deps) + + # For symbols and choices.. + else: + + # See comment for 'menu_dep' + stmt.menu_dep = depends_on_expr + + # Propagate dependencies specified with 'depends on' to any new + # default expressions, prompts, and selections. ("New" since a + # symbol might be defined in multiple places and the dependencies + # should only apply to the local definition.) + + new_def_exprs = [(val_expr, _make_and(cond_expr, depends_on_expr)) + for (val_expr, cond_expr) in new_def_exprs] + + new_selects = [(target, _make_and(cond_expr, depends_on_expr)) + for (target, cond_expr) in new_selects] + + if new_prompt is not None: + prompt, cond_expr = new_prompt + + # 'visible if' dependencies from enclosing menus get propagated + # to prompts + if visible_if_deps is not None: + cond_expr = _make_and(cond_expr, visible_if_deps) + + new_prompt = (prompt, _make_and(cond_expr, depends_on_expr)) + + # We save the original expressions -- before any menu and if + # conditions have been propagated -- so these can be retrieved + # later. + + stmt.orig_def_exprs.extend(new_def_exprs) + if new_prompt is not None: + stmt.orig_prompts.append(new_prompt) + + # Only symbols can select + if isinstance(stmt, Symbol): + stmt.orig_selects.extend(new_selects) + + # Save dependencies from enclosing menus and if's + stmt.deps_from_containing = deps + + # The set of symbols referenced directly by the symbol/choice plus + # all symbols referenced by enclosing menus and if's. + stmt.all_referenced_syms = \ + stmt.referenced_syms | _get_expr_syms(deps) + + # Propagate dependencies from enclosing menus and if's + + stmt.def_exprs.extend([(val_expr, _make_and(cond_expr, deps)) + for (val_expr, cond_expr) in new_def_exprs]) + + for (target, cond) in new_selects: + target.rev_dep = _make_or(target.rev_dep, + _make_and(stmt, + _make_and(cond, deps))) + + if new_prompt is not None: + prompt, cond_expr = new_prompt + stmt.prompts.append((prompt, _make_and(cond_expr, deps))) + + # + # Symbol table manipulation + # + + def _sym_lookup(self, name, add_sym_if_not_exists = True): + """Fetches the symbol 'name' from the symbol table, optionally adding + it if it does not exist (this is usually what we want).""" + if name in self.syms: + return self.syms[name] + + new_sym = Symbol() + new_sym.config = self + new_sym.name = name + + if add_sym_if_not_exists: + self.syms[name] = new_sym + else: + # This warning is generated while evaluating an expression + # containing undefined symbols using Config.eval() + self._warn("no symbol {0} in configuration".format(name)) + + return new_sym + + # + # Evaluation of symbols and expressions + # + + def _eval_expr(self, expr): + """Evaluates an expression and returns one of the tristate values "n", + "m" or "y".""" + res = self._eval_expr_2(expr) + + # Promote "m" to "y" if we're running without modules. Internally, "m" + # is often rewritten to "m" && MODULES by both the C implementation and + # kconfiglib, which takes care of cases where "m" should be false if + # we're running without modules. + if res == "m" and not self._has_modules(): + return "y" + + return res + + def _eval_expr_2(self, expr): + if expr is None: + return "y" + + if isinstance(expr, Symbol): + # Non-bool/tristate symbols are always "n" in a tristate sense, + # regardless of their value + if expr.type != BOOL and expr.type != TRISTATE: + return "n" + return expr.get_value() + + if isinstance(expr, str): + return expr if (expr == "y" or expr == "m") else "n" + + first_expr = expr[0] + + if first_expr == OR: + res = "n" + + for subexpr in expr[1]: + ev = self._eval_expr_2(subexpr) + + # Return immediately upon discovering a "y" term + if ev == "y": + return "y" + + if ev == "m": + res = "m" + + # 'res' is either "n" or "m" here; we already handled the + # short-circuiting "y" case in the loop. + return res + + if first_expr == AND: + res = "y" + + for subexpr in expr[1]: + ev = self._eval_expr_2(subexpr) + + # Return immediately upon discovering an "n" term + if ev == "n": + return "n" + + if ev == "m": + res = "m" + + # 'res' is either "m" or "y" here; we already handled the + # short-circuiting "n" case in the loop. + return res + + if first_expr == NOT: + ev = self._eval_expr_2(expr[1]) + + if ev == "y": + return "n" + + return "y" if (ev == "n") else "m" + + if first_expr == EQUAL: + return "y" if (self._get_str_value(expr[1]) == + self._get_str_value(expr[2])) else "n" + + if first_expr == UNEQUAL: + return "y" if (self._get_str_value(expr[1]) != + self._get_str_value(expr[2])) else "n" + + _internal_error("Internal error while evaluating expression: " + "unknown operation {0}.".format(first_expr)) + + def _get_str_value(self, obj): + if isinstance(obj, str): + return obj + # obj is a Symbol + return obj.get_value() + + def _eval_min(self, e1, e2): + e1_eval = self._eval_expr(e1) + e2_eval = self._eval_expr(e2) + + return e1_eval if tri_less(e1_eval, e2_eval) else e2_eval + + def _eval_max(self, e1, e2): + e1_eval = self._eval_expr(e1) + e2_eval = self._eval_expr(e2) + + return e1_eval if tri_greater(e1_eval, e2_eval) else e2_eval + + # + # Methods related to the MODULES symbol + # + + def _has_modules(self): + modules_sym = self.syms.get("MODULES") + return (modules_sym is not None) and (modules_sym.get_value() == "y") + + # + # Dependency tracking + # + + def _build_dep(self): + """Populates the Symbol.dep sets, linking the symbol to the symbols + that immediately depend on it in the sense that changing the value of + the symbol might affect the values of those other symbols. This is used + for caching/invalidation purposes. The calculated sets might be larger + than necessary as we don't do any complicated analysis of the + expressions.""" + for sym in self.syms.itervalues(): + sym.dep = set() + + # Adds 'sym' as a directly dependent symbol to all symbols that appear + # in the expression 'e' + def add_expr_deps(e, sym): + for s in _get_expr_syms(e): + s.dep.add(sym) + + # The directly dependent symbols of a symbol are: + # - Any symbols whose prompts, default values, rev_dep (select + # condition), or ranges depend on the symbol + # - Any symbols that belong to the same choice statement as the symbol + # (these won't be included in 'dep' as that makes the dependency + # graph unwieldy, but Symbol._get_dependent() will include them) + # - Any symbols in a choice statement that depends on the symbol + for sym in self.syms.itervalues(): + for (_, e) in sym.prompts: + add_expr_deps(e, sym) + + for (v, e) in sym.def_exprs: + add_expr_deps(v, sym) + add_expr_deps(e, sym) + + add_expr_deps(sym.rev_dep, sym) + + for (l, u, e) in sym.ranges: + add_expr_deps(l, sym) + add_expr_deps(u, sym) + add_expr_deps(e, sym) + + if sym.is_choice_symbol_: + choice = sym.parent + + for (_, e) in choice.prompts: + add_expr_deps(e, sym) + + for (_, e) in choice.def_exprs: + add_expr_deps(e, sym) + + def _expr_val_str(self, expr, no_value_str = "(none)", get_val_instead_of_eval = False): + # Since values are valid expressions, _expr_to_str() will get a nice + # string representation for those as well. + + if expr is None: + return no_value_str + + if get_val_instead_of_eval: + if isinstance(expr, str): + return _expr_to_str(expr) + val = expr.get_value() + else: + val = self._eval_expr(expr) + + return "{0} (value: {1})".format(_expr_to_str(expr), _expr_to_str(val)) + + def _expand_sym_refs(self, s): + """Expands $-references to symbols in 's' to symbol values, or to the + empty string for undefined symbols.""" + + while 1: + sym_ref_re_match = sym_ref_re.search(s) + if sym_ref_re_match is None: + return s + + sym_name = sym_ref_re_match.group(0)[1:] + sym = self.syms.get(sym_name) + expansion = "" if sym is None else sym.get_value() + + s = s[:sym_ref_re_match.start()] + \ + expansion + \ + s[sym_ref_re_match.end():] + + def _get_sym_or_choice_str(self, sc): + """Symbols and choices have many properties in common, so we factor out + common __str__() stuff here. "sc" is short for "symbol or choice".""" + + # As we deal a lot with string representations here, use some + # convenient shorthand: + s = _expr_to_str + + # + # Common symbol/choice properties + # + + user_value_str = "(no user value)" if sc.user_val is None else s(sc.user_val) + + visibility_str = s(sc.get_visibility()) + + # Build prompts string + if sc.prompts == []: + prompts_str = " (no prompts)" + else: + prompts_str_rows = [] + + for (prompt, cond_expr) in sc.orig_prompts: + if cond_expr is None: + prompts_str_rows.append(' "{0}"'.format(prompt)) + else: + prompts_str_rows.append(' "{0}" if '.format(prompt) + + self._expr_val_str(cond_expr)) + + prompts_str = "\n".join(prompts_str_rows) + + # Build locations string + if sc.def_locations == []: + locations_str = "(no locations)" + else: + locations_str = " ".join(["{0}:{1}".format(filename, linenr) for + (filename, linenr) in sc.def_locations]) + + # Build additional-dependencies-from-menus-and-if's string + additional_deps_str = " " + self._expr_val_str(sc.deps_from_containing, + "(no additional dependencies)") + + # + # Symbol-specific stuff + # + + if isinstance(sc, Symbol): + + # Build value string + value_str = s(sc.get_value()) + + # Build ranges string + if isinstance(sc, Symbol): + if sc.ranges == []: + ranges_str = " (no ranges)" + else: + ranges_str_rows = [] + + for (l, u, cond_expr) in sc.ranges: + if cond_expr is None: + ranges_str_rows.append(" [{0}, {1}]".format(s(l), s(u))) + else: + ranges_str_rows.append(" [{0}, {1}] if {2}" + .format(s(l), s(u), self._expr_val_str(cond_expr))) + + ranges_str = "\n".join(ranges_str_rows) + + # Build default values string + if sc.def_exprs == []: + defaults_str = " (no default values)" + else: + defaults_str_rows = [] + + for (val_expr, cond_expr) in sc.orig_def_exprs: + row_str = " " + self._expr_val_str(val_expr, "(none)", sc.type == STRING) + defaults_str_rows.append(row_str) + defaults_str_rows.append(" Condition: " + self._expr_val_str(cond_expr)) + + defaults_str = "\n".join(defaults_str_rows) + + # Build selects string + if sc.orig_selects == []: + selects_str = " (no selects)" + else: + selects_str_rows = [] + + for (target, cond_expr) in sc.orig_selects: + if cond_expr is None: + selects_str_rows.append(" {0}".format(target.name)) + else: + selects_str_rows.append(" {0} if ".format(target.name) + + self._expr_val_str(cond_expr)) + + selects_str = "\n".join(selects_str_rows) + + # Build reverse dependencies string + if sc.rev_dep == "n": + rev_dep_str = " (no reverse dependencies)" + else: + rev_dep_str = " " + self._expr_val_str(sc.rev_dep) + + res = _sep_lines("Symbol " + (sc.name if sc.name is not None else "(no name)"), + "Type : " + typename[sc.type], + "Value : " + value_str, + "User value : " + user_value_str, + "Visibility : " + visibility_str, + "Is choice item : " + bool_str[sc.is_choice_symbol_], + "Is defined : " + bool_str[sc.is_defined_], + "Is from env. : " + bool_str[sc.is_from_env], + "Is special : " + bool_str[sc.is_special_] + "\n") + + if sc.ranges != []: + res += _sep_lines("Ranges:", + ranges_str + "\n") + + res += _sep_lines("Prompts:", + prompts_str, + "Default values:", + defaults_str, + "Selects:", + selects_str, + "Reverse dependencies:", + rev_dep_str, + "Additional dependencies from enclosing menus and if's:", + additional_deps_str, + "Locations: " + locations_str) + + return res + + # + # Choice-specific stuff + # + + # Build name string (for named choices) + if sc.name is None: + name_str = "(no name)" + else: + name_str = sc.name + + # Build selected symbol string + sel = sc.get_selection() + if sel is None: + sel_str = "(no selection)" + else: + sel_str = sel.name + + # Build mode string + mode_str = s(sc.get_mode()) + + # Build default values string + if sc.def_exprs == []: + defaults_str = " (no default values)" + else: + defaults_str_rows = [] + + for (sym, cond_expr) in sc.orig_def_exprs: + if cond_expr is None: + defaults_str_rows.append(" {0}".format(sym.name)) + else: + defaults_str_rows.append(" {0} if ".format(sym.name) + + self._expr_val_str(cond_expr)) + + defaults_str = "\n".join(defaults_str_rows) + + # Build contained symbols string + names = [sym.name for sym in sc.get_symbols()] + + if names == []: + syms_string = "(empty)" + else: + syms_string = " ".join(names) + + return _sep_lines("Choice", + "Name (for named choices): " + name_str, + "Type : " + typename[sc.type], + "Selected symbol : " + sel_str, + "User value : " + user_value_str, + "Mode : " + mode_str, + "Visibility : " + visibility_str, + "Optional : " + bool_str[sc.optional], + "Prompts:", + prompts_str, + "Defaults:", + defaults_str, + "Choice symbols:", + " " + syms_string, + "Additional dependencies from enclosing menus and if's:", + additional_deps_str, + "Locations: " + locations_str) + + def _expr_depends_on(self, expr, sym): + """Reimplementation of expr_depends_symbol() from mconf.c. Used to + determine if a submenu should be implicitly created, which influences what + items inside choice statements are considered choice items.""" + if expr is None: + return False + + def rec(expr): + if isinstance(expr, str): + return False + + if isinstance(expr, Symbol): + return expr is sym + + e0 = expr[0] + + if e0 == EQUAL or e0 == UNEQUAL: + return self._eq_to_sym(expr) is sym + + if e0 == AND: + for and_expr in expr[1]: + if rec(and_expr): + return True + + return False + + return rec(expr) + + def _eq_to_sym(self, eq): + """_expr_depends_on() helper. For (in)equalities of the form sym = y/m + or sym != n, returns sym. For other (in)equalities, returns None.""" + relation, left, right = eq + + left = self._transform_n_m_y(left) + right = self._transform_n_m_y(right) + + # Make sure the symbol (if any) appears to the left + if not isinstance(left, Symbol): + left, right = right, left + + if not isinstance(left, Symbol): + return None + + if (relation == EQUAL and (right == "m" or right == "y")) or \ + (relation == UNEQUAL and right == "n"): + return left + + return None + + def _transform_n_m_y(self, item): + """_eq_to_sym() helper. Translates the symbols n, m, and y to their + string equivalents.""" + if item is self.n: + return "n" + if item is self.m: + return "m" + if item is self.y: + return "y" + return item + + def _warn(self, msg, filename = None, linenr = None): + """For printing warnings to stderr.""" + if self.print_warnings: + self._warn_or_undef_assign(msg, WARNING, filename, linenr) + + def _undef_assign(self, msg, filename = None, linenr = None): + """For printing informational messages related to assignments + to undefined variables to stderr.""" + if self.print_undef_assign: + self._warn_or_undef_assign(msg, UNDEF_ASSIGN, filename, linenr) + + def _warn_or_undef_assign(self, msg, msg_type, filename, linenr): + if filename is not None: + sys.stderr.write("{0}:".format(_clean_up_path(filename))) + if linenr is not None: + sys.stderr.write("{0}:".format(linenr)) + + if msg_type == WARNING: + sys.stderr.write("warning: ") + elif msg_type == UNDEF_ASSIGN: + sys.stderr.write("info: ") + else: + _internal_error('Internal error while printing warning: unknown warning type "{0}".' + .format(msg_type)) + + sys.stderr.write(msg + "\n") + +def _get_expr_syms(expr): + """Returns the set() of symbols appearing in expr.""" + res = set() + if expr is None: + return res + + def rec(expr): + if isinstance(expr, Symbol): + res.add(expr) + return + + if isinstance(expr, str): + return + + e0 = expr[0] + + if e0 == OR or e0 == AND: + for term in expr[1]: + rec(term) + + elif e0 == NOT: + rec(expr[1]) + + elif e0 == EQUAL or e0 == UNEQUAL: + _, v1, v2 = expr + + if isinstance(v1, Symbol): + res.add(v1) + + if isinstance(v2, Symbol): + res.add(v2) + + else: + _internal_error("Internal error while fetching symbols from an " + "expression with token stream {0}.".format(expr)) + + rec(expr) + return res + + +# +# Construction of expressions +# + +# These functions as well as the _eval_min/max() functions above equate +# None with "y", which is usually what we want, but needs to be kept in +# mind. + +def _make_or(e1, e2): + # Perform trivial simplification and avoid None's (which + # correspond to y's) + if e1 is None or e2 is None or \ + e1 == "y" or e2 == "y": + return "y" + + if e1 == "n": + return e2 + + if e2 == "n": + return e1 + + # Prefer to merge/update argument list if possible instead of creating + # a new OR node + + if isinstance(e1, tuple) and e1[0] == OR: + if isinstance(e2, tuple) and e2[0] == OR: + return (OR, e1[1] + e2[1]) + return (OR, e1[1] + [e2]) + + if isinstance(e2, tuple) and e2[0] == OR: + return (OR, e2[1] + [e1]) + + return (OR, [e1, e2]) + +# Note: returns None if e1 == e2 == None + +def _make_and(e1, e2): + if e1 == "n" or e2 == "n": + return "n" + + if e1 is None or e1 == "y": + return e2 + + if e2 is None or e2 == "y": + return e1 + + # Prefer to merge/update argument list if possible instead of creating + # a new AND node + + if isinstance(e1, tuple) and e1[0] == AND: + if isinstance(e2, tuple) and e2[0] == AND: + return (AND, e1[1] + e2[1]) + return (AND, e1[1] + [e2]) + + if isinstance(e2, tuple) and e2[0] == AND: + return (AND, e2[1] + [e1]) + + return (AND, [e1, e2]) + +# +# Constants and functions related to types, parsing, evaluation and printing, +# put globally to unclutter the Config class a bit. +# + +# Tokens +(T_OR, T_AND, T_NOT, + T_OPEN_PAREN, T_CLOSE_PAREN, + T_EQUAL, T_UNEQUAL, + T_MAINMENU, T_MENU, T_ENDMENU, + T_SOURCE, T_CHOICE, T_ENDCHOICE, + T_COMMENT, T_CONFIG, T_MENUCONFIG, + T_HELP, T_IF, T_ENDIF, T_DEPENDS, T_ON, + T_OPTIONAL, T_PROMPT, T_DEFAULT, + T_BOOL, T_TRISTATE, T_HEX, T_INT, T_STRING, + T_DEF_BOOL, T_DEF_TRISTATE, + T_SELECT, T_RANGE, T_OPTION, T_ENV, + T_DEFCONFIG_LIST, T_MODULES, T_VISIBLE) = range(0, 38) + +# Keyword to token map +keywords = { + "mainmenu" : T_MAINMENU, + "menu" : T_MENU, + "endmenu" : T_ENDMENU, + "endif" : T_ENDIF, + "endchoice" : T_ENDCHOICE, + "source" : T_SOURCE, + "choice" : T_CHOICE, + "config" : T_CONFIG, + "comment" : T_COMMENT, + "menuconfig" : T_MENUCONFIG, + "help" : T_HELP, + "if" : T_IF, + "depends" : T_DEPENDS, + "on" : T_ON, + "optional" : T_OPTIONAL, + "prompt" : T_PROMPT, + "default" : T_DEFAULT, + "bool" : T_BOOL, + "boolean" : T_BOOL, + "tristate" : T_TRISTATE, + "int" : T_INT, + "hex" : T_HEX, + "def_bool" : T_DEF_BOOL, + "def_tristate" : T_DEF_TRISTATE, + "string" : T_STRING, + "select" : T_SELECT, + "range" : T_RANGE, + "option" : T_OPTION, + "env" : T_ENV, + "defconfig_list" : T_DEFCONFIG_LIST, + "modules" : T_MODULES, + "visible" : T_VISIBLE } + +# Strings to use for True and False +bool_str = { False : "false", True : "true" } + +# Tokens after which identifier-like lexemes are treated as strings. T_CHOICE +# is included to avoid symbols being registered for named choices. +string_lex = frozenset((T_BOOL, T_TRISTATE, T_INT, T_HEX, T_STRING, T_CHOICE, + T_PROMPT, T_MENU, T_COMMENT, T_SOURCE, T_MAINMENU)) + +# Matches the initial token on a line; see _tokenize(). +initial_token_re = re.compile(r"[^\w]*(\w+)") + +# Matches an identifier/keyword optionally preceded by whitespace +id_keyword_re = re.compile(r"\s*([\w./-]+)") + +# Regular expressions for parsing .config files +set_re = re.compile(r"CONFIG_(\w+)=(.*)") +unset_re = re.compile(r"# CONFIG_(\w+) is not set") + +# Regular expression for finding $-references to symbols in strings +sym_ref_re = re.compile(r"\$[A-Za-z_]+") + +# Integers representing symbol types +UNKNOWN, BOOL, TRISTATE, STRING, HEX, INT = range(0, 6) + +# Strings to use for types +typename = { + UNKNOWN : "unknown", + BOOL : "bool", + TRISTATE : "tristate", + STRING : "string", + HEX : "hex", + INT : "int" } + +# Token to type mapping +token_to_type = { T_BOOL : BOOL, + T_TRISTATE : TRISTATE, + T_STRING : STRING, + T_INT : INT, + T_HEX : HEX } + +# Default values for symbols of different types (the value the symbol gets if +# it is not assigned a user value and none of its 'default' clauses kick in) +default_value = { BOOL : "n", + TRISTATE : "n", + STRING : "", + INT : "", + HEX : "" } + +# Indicates that no item is selected in a choice statement +NO_SELECTION = 0 + +# Integers representing expression types +OR, AND, NOT, EQUAL, UNEQUAL = range(0, 5) + +# Map from tristate values to integers +tri_to_int = { "n" : 0, "m" : 1, "y" : 2 } + +# Printing-related stuff + +op_to_str = { AND : " && ", + OR : " || ", + EQUAL : " = ", + UNEQUAL : " != " } + +precedence = { OR : 0, AND : 1, NOT : 2 } + +# Types of informational messages +WARNING = 0 +UNDEF_ASSIGN = 1 + +def _intersperse(lst, op): + """_expr_to_str() helper. Gets the string representation of each expression in lst + and produces a list where op has been inserted between the elements.""" + if lst == []: + return "" + + res = [] + + def handle_sub_expr(expr): + no_parens = isinstance(expr, (str, Symbol)) or \ + expr[0] in (EQUAL, UNEQUAL) or \ + precedence[op] <= precedence[expr[0]] + if not no_parens: + res.append("(") + res.extend(_expr_to_str_rec(expr)) + if not no_parens: + res.append(")") + + op_str = op_to_str[op] + + handle_sub_expr(lst[0]) + for expr in lst[1:]: + res.append(op_str) + handle_sub_expr(expr) + + return res + +def _expr_to_str(expr): + s = "".join(_expr_to_str_rec(expr)) + return s + +def _sym_str_string(sym_or_str): + if isinstance(sym_or_str, str): + return '"{0}"'.format(sym_or_str) + return sym_or_str.name + +def _expr_to_str_rec(expr): + if expr is None: + return [""] + + if isinstance(expr, (Symbol, str)): + return [_sym_str_string(expr)] + + e0 = expr[0] + + if e0 == OR or e0 == AND: + return _intersperse(expr[1], expr[0]) + + if e0 == NOT: + need_parens = not isinstance(expr[1], (str, Symbol)) + + res = ["!"] + if need_parens: + res.append("(") + res.extend(_expr_to_str_rec(expr[1])) + if need_parens: + res.append(")") + return res + + if e0 == EQUAL or e0 == UNEQUAL: + return [_sym_str_string(expr[1]), + op_to_str[expr[0]], + _sym_str_string(expr[2])] + +class _Block: + + """Represents a list of items (symbols, menus, choice statements and + comments) appearing at the top-level of a file or witin a menu, choice or + if statement.""" + + def __init__(self): + self.items = [] + + def get_items(self): + return self.items + + def add_item(self, item): + self.items.append(item) + + def _make_conf(self): + # Collect the substrings in a list and later use join() instead of += + # to build the final .config contents. With older Python versions, this + # yields linear instead of quadratic complexity. + strings = [] + for item in self.items: + strings.extend(item._make_conf()) + + return strings + + def add_depend_expr(self, expr): + for item in self.items: + item.add_depend_expr(expr) + +class Item(): + + """Base class for symbols and other Kconfig constructs. Subclasses are + Symbol, Choice, Menu, and Comment.""" + + def is_symbol(self): + """Returns True if the item is a symbol, otherwise False. Short for + isinstance(item, kconfiglib.Symbol).""" + return isinstance(self, Symbol) + + def is_choice(self): + """Returns True if the item is a choice, otherwise False. Short for + isinstance(item, kconfiglib.Choice).""" + return isinstance(self, Choice) + + def is_menu(self): + """Returns True if the item is a menu, otherwise False. Short for + isinstance(item, kconfiglib.Menu).""" + return isinstance(self, Menu) + + def is_comment(self): + """Returns True if the item is a comment, otherwise False. Short for + isinstance(item, kconfiglib.Comment).""" + return isinstance(self, Comment) + +class _HasVisibility(): + + """Base class for elements that have a "visibility" that acts as an upper + limit on the values a user can set for them. Subclasses are Symbol and + Choice (which supply some of the attributes).""" + + def __init__(self): + self.cached_visibility = None + self.prompts = [] + + def _invalidate(self): + self.cached_visibility = None + + def _get_visibility(self): + if self.cached_visibility is None: + vis = "n" + for (prompt, cond_expr) in self.prompts: + vis = self.config._eval_max(vis, cond_expr) + + if isinstance(self, Symbol) and self.is_choice_symbol_: + vis = self.config._eval_min(vis, self.parent._get_visibility()) + + # Promote "m" to "y" if we're dealing with a non-tristate + if vis == "m" and self.type != TRISTATE: + vis = "y" + + self.cached_visibility = vis + + return self.cached_visibility + +class Symbol(Item, _HasVisibility): + + """Represents a configuration symbol - e.g. FOO for + + config FOO + ...""" + + # + # Public interface + # + + def get_value(self): + """Calculate and return the value of the symbol. See also + Symbol.set_user_value().""" + + if self.cached_value is not None: + return self.cached_value + + self.write_to_conf = False + + # As a quirk of Kconfig, undefined symbols get their name as their + # value. This is why things like "FOO = bar" work for seeing if FOO has + # the value "bar". + if self.type == UNKNOWN: + self.cached_value = self.name + return self.name + + new_val = default_value[self.type] + + vis = self._get_visibility() + + if self.type == BOOL or self.type == TRISTATE: + # The visibility and mode (modules-only or single-selection) of + # choice items will be taken into account in self._get_visibility() + + if self.is_choice_symbol_: + if vis != "n": + choice = self.parent + mode = choice.get_mode() + + self.write_to_conf = (mode != "n") + + if mode == "y": + new_val = "y" if (choice.get_selection() is self) else "n" + elif mode == "m": + if self.user_val == "m" or self.user_val == "y": + new_val = "m" + + else: + use_defaults = True + + if vis != "n": + # If the symbol is visible and has a user value, use that. + # Otherwise, look at defaults. + self.write_to_conf = True + + if self.user_val is not None: + new_val = self.config._eval_min(self.user_val, vis) + use_defaults = False + + if use_defaults: + for (val_expr, cond_expr) in self.def_exprs: + cond_eval = self.config._eval_expr(cond_expr) + + if cond_eval != "n": + self.write_to_conf = True + new_val = self.config._eval_min(val_expr, cond_eval) + break + + # Reverse dependencies take precedence + rev_dep_val = self.config._eval_expr(self.rev_dep) + + if rev_dep_val != "n": + self.write_to_conf = True + new_val = self.config._eval_max(new_val, rev_dep_val) + + # Promote "m" to "y" for booleans + if new_val == "m" and self.type == BOOL: + new_val = "y" + + elif self.type == STRING: + use_defaults = True + + if vis != "n": + self.write_to_conf = True + if self.user_val is not None: + new_val = self.user_val + use_defaults = False + + if use_defaults: + for (val_expr, cond_expr) in self.def_exprs: + if self.config._eval_expr(cond_expr) != "n": + self.write_to_conf = True + new_val = self.config._get_str_value(val_expr) + break + + elif self.type == HEX or self.type == INT: + has_active_range = False + low = None + high = None + use_defaults = True + + base = 16 if self.type == HEX else 10 + + for(l, h, cond_expr) in self.ranges: + if self.config._eval_expr(cond_expr) != "n": + has_active_range = True + + low_str = self.config._get_str_value(l) + high_str = self.config._get_str_value(h) + + low = int(low_str, base) if \ + _is_base_n(low_str, base) else 0 + high = int(high_str, base) if \ + _is_base_n(high_str, base) else 0 + + break + + if vis != "n": + self.write_to_conf = True + + if self.user_val is not None and \ + _is_base_n(self.user_val, base) and \ + (not has_active_range or + low <= int(self.user_val, base) <= high): + + # If the user value is OK, it is stored in exactly the same + # form as specified in the assignment (with or without + # "0x", etc). + + use_defaults = False + new_val = self.user_val + + if use_defaults: + for (val_expr, cond_expr) in self.def_exprs: + if self.config._eval_expr(cond_expr) != "n": + self.write_to_conf = True + + # If the default value is OK, it is stored in exactly + # the same form as specified. Otherwise, it is clamped + # to the range, and the output has "0x" as appropriate + # for the type. + + new_val = self.config._get_str_value(val_expr) + + if _is_base_n(new_val, base): + new_val_num = int(new_val, base) + if has_active_range: + clamped_val = None + + if new_val_num < low: + clamped_val = low + elif new_val_num > high: + clamped_val = high + + if clamped_val is not None: + new_val = (hex(clamped_val) if \ + self.type == HEX else str(clamped_val)) + + break + else: # For the for loop + # If no user value or default kicks in but the hex/int has + # an active range, then the low end of the range is used, + # provided it's > 0, with "0x" prepended as appropriate. + + if has_active_range and low > 0: + new_val = (hex(low) if self.type == HEX else str(low)) + + self.cached_value = new_val + return new_val + + def set_user_value(self, v): + """Sets the user value of the symbol. + + Equal in effect to assigning the value to the symbol within a .config + file. Use get_lower/upper_bound() or get_assignable_values() to find + the range of currently assignable values for bool and tristate symbols; + setting values outside this range will cause the user value to differ + from the result of Symbol.get_value() (be truncated). Values that are + invalid for the type (such as a_bool.set_user_value("foo")) are + ignored, and a warning is emitted if an attempt is made to assign such + a value. + + For any type of symbol, is_modifiable() can be used to check if a user + value will currently have any effect on the symbol, as determined by + its visibility and range of assignable values. Any value that is valid + for the type (bool, tristate, etc.) will end up being reflected in + get_user_value() though, and might have an effect later if conditions + change. To get rid of the user value, use unset_user_value(). + + Any symbols dependent on the symbol are (recursively) invalidated, so + things will just work with regards to dependencies. + + v -- The user value to give to the symbol.""" + self._set_user_value_no_invalidate(v, False) + + # There might be something more efficient you could do here, but play + # it safe. + if self.name == "MODULES": + self.config._invalidate_all() + return + + self._invalidate() + self._invalidate_dependent() + + def unset_user_value(self): + """Resets the user value of the symbol, as if the symbol had never + gotten a user value via Config.load_config() or + Symbol.set_user_value().""" + self._unset_user_value_no_recursive_invalidate() + self._invalidate_dependent() + + def get_user_value(self): + """Returns the value assigned to the symbol in a .config or via + Symbol.set_user_value() (provided the value was valid for the type of the + symbol). Returns None in case of no user value.""" + return self.user_val + + def get_name(self): + """Returns the name of the symbol.""" + return self.name + + def get_prompts(self): + """Returns a list of prompts defined for the symbol, in the order they + appear in the configuration files. Returns the empty list for symbols + with no prompt. + + This list will have a single entry for the vast majority of symbols + having prompts, but having multiple prompts for a single symbol is + possible through having multiple 'config' entries for it.""" + return [prompt for prompt, _ in self.orig_prompts] + + def get_upper_bound(self): + """For string/hex/int symbols and for bool and tristate symbols that + cannot be modified (see is_modifiable()), returns None. + + Otherwise, returns the highest value the symbol can be set to with + Symbol.set_user_value() (that will not be truncated): one of "m" or "y", + arranged from lowest to highest. This corresponds to the highest value + the symbol could be given in e.g. the 'make menuconfig' interface. + + See also the tri_less*() and tri_greater*() functions, which could come + in handy.""" + if self.type != BOOL and self.type != TRISTATE: + return None + rev_dep = self.config._eval_expr(self.rev_dep) + # A bool selected to "m" gets promoted to "y" + if self.type == BOOL and rev_dep == "m": + rev_dep = "y" + vis = self._get_visibility() + if (tri_to_int[vis] - tri_to_int[rev_dep]) > 0: + return vis + return None + + def get_lower_bound(self): + """For string/hex/int symbols and for bool and tristate symbols that + cannot be modified (see is_modifiable()), returns None. + + Otherwise, returns the lowest value the symbol can be set to with + Symbol.set_user_value() (that will not be truncated): one of "n" or "m", + arranged from lowest to highest. This corresponds to the lowest value + the symbol could be given in e.g. the 'make menuconfig' interface. + + See also the tri_less*() and tri_greater*() functions, which could come + in handy.""" + if self.type != BOOL and self.type != TRISTATE: + return None + rev_dep = self.config._eval_expr(self.rev_dep) + # A bool selected to "m" gets promoted to "y" + if self.type == BOOL and rev_dep == "m": + rev_dep = "y" + if (tri_to_int[self._get_visibility()] - tri_to_int[rev_dep]) > 0: + return rev_dep + return None + + def get_assignable_values(self): + """For string/hex/int symbols and for bool and tristate symbols that + cannot be modified (see is_modifiable()), returns the empty list. + + Otherwise, returns a list containing the user values that can be + assigned to the symbol (that won't be truncated). Usage example: + + if "m" in sym.get_assignable_values(): + sym.set_user_value("m") + + This is basically a more convenient interface to + get_lower/upper_bound() when wanting to test if a particular tristate + value can be assigned.""" + if self.type != BOOL and self.type != TRISTATE: + return [] + rev_dep = self.config._eval_expr(self.rev_dep) + # A bool selected to "m" gets promoted to "y" + if self.type == BOOL and rev_dep == "m": + rev_dep = "y" + res = ["n", "m", "y"][tri_to_int[rev_dep] : + tri_to_int[self._get_visibility()] + 1] + return res if len(res) > 1 else [] + + def get_type(self): + """Returns the type of the symbol: one of UNKNOWN, BOOL, TRISTATE, + STRING, HEX, or INT. These are defined at the top level of the module, + so you'd do something like + + if sym.get_type() == kconfiglib.STRING: + ...""" + return self.type + + def get_visibility(self): + """Returns the visibility of the symbol: one of "n", "m" or "y". For + bool and tristate symbols, this is an upper bound on the value users + can set for the symbol. For other types of symbols, a visibility of "n" + means the user value will be ignored. A visibility of "n" corresponds + to not being visible in the 'make *config' interfaces. + + Example (assuming we're running with modules enabled -- i.e., MODULES + set to 'y'): + + # Assume this has been assigned 'n' + config N_SYM + tristate "N_SYM" + + # Assume this has been assigned 'm' + config M_SYM + tristate "M_SYM" + + # Has visibility 'n' + config A + tristate "A" + depends on N_SYM + + # Has visibility 'm' + config B + tristate "B" + depends on M_SYM + + # Has visibility 'y' + config C + tristate "C" + + # Has no prompt, and hence visibility 'n' + config D + tristate + + Having visibility be tri-valued ensures that e.g. a symbol cannot be + set to "y" by the user if it depends on a symbol with value "m", which + wouldn't be safe. + + You should probably look at get_lower/upper_bound(), + get_assignable_values() and is_modifiable() before using this.""" + return self._get_visibility() + + def get_parent(self): + """Returns the menu or choice statement that contains the symbol, or + None if the symbol is at the top level. Note that if statements are + treated as syntactic and do not have an explicit class + representation.""" + return self.parent + + def get_referenced_symbols(self, refs_from_enclosing = False): + """Returns the set() of all symbols referenced by this symbol. For + example, the symbol defined by + + config FOO + bool + prompt "foo" if A && B + default C if D + depends on E + select F if G + + references the symbols A through G. + + refs_from_enclosing (default: False) -- If True, the symbols + referenced by enclosing menus and if's will be + included in the result.""" + return self.all_referenced_syms if refs_from_enclosing else self.referenced_syms + + def get_selected_symbols(self): + """Returns the set() of all symbols X for which this symbol has a + 'select X' or 'select X if Y' (regardless of whether Y is satisfied or + not). This is a subset of the symbols returned by + get_referenced_symbols().""" + return self.selected_syms + + def get_help(self): + """Returns the help text of the symbol, or None if the symbol has no + help text.""" + return self.help + + def get_config(self): + """Returns the Config instance this symbol is from.""" + return self.config + + def get_def_locations(self): + """Returns a list of (filename, linenr) tuples, where filename (string) + and linenr (int) represent a location where the symbol is defined. For + the vast majority of symbols this list will only contain one element. + For the following Kconfig, FOO would get two entries: the lines marked + with *. + + config FOO * + bool "foo prompt 1" + + config FOO * + bool "foo prompt 2" + """ + return self.def_locations + + def get_ref_locations(self): + """Returns a list of (filename, linenr) tuples, where filename (string) + and linenr (int) represent a location where the symbol is referenced in + the configuration. For example, the lines marked by * would be included + for FOO below: + + config A + bool + default BAR || FOO * + + config B + tristate + depends on FOO * + default m if FOO * + + if FOO * + config A + bool "A" + endif + + config FOO (definition not included) + bool + """ + return self.ref_locations + + def is_modifiable(self): + """Returns True if the value of the symbol could be modified by calling + Symbol.set_user_value() and False otherwise. + + For bools and tristates, this corresponds to the symbol being visible + in the 'make menuconfig' interface and not already being pinned to a + specific value (e.g. because it is selected by another symbol). + + For strings and numbers, this corresponds to just being visible. (See + Symbol.get_visibility().)""" + if self.is_special_: + return False + if self.type == BOOL or self.type == TRISTATE: + rev_dep = self.config._eval_expr(self.rev_dep) + # A bool selected to "m" gets promoted to "y" + if self.type == BOOL and rev_dep == "m": + rev_dep = "y" + return (tri_to_int[self._get_visibility()] - + tri_to_int[rev_dep]) > 0 + return self._get_visibility() != "n" + + def is_defined(self): + """Returns False if the symbol is referred to in the Kconfig but never + actually defined, otherwise True.""" + return self.is_defined_ + + def is_special(self): + """Returns True if the symbol is one of the special symbols n, m, y, or + UNAME_RELEASE, or gets its value from the environment. Otherwise, + returns False.""" + return self.is_special_ + + def is_from_environment(self): + """Returns True if the symbol gets its value from the environment. + Otherwise, returns False.""" + return self.is_from_env + + def has_ranges(self): + """Returns True if the symbol is of type INT or HEX and has ranges that + limits what values it can take on, otherwise False.""" + return self.ranges != [] + + def is_choice_symbol(self): + """Returns True if the symbol is in a choice statement and is an actual + choice symbol (see Choice.get_symbols()); otherwise, returns + False.""" + return self.is_choice_symbol_ + + def is_choice_selection(self): + """Returns True if the symbol is contained in a choice statement and is + the selected item, otherwise False. Equivalent to 'sym.is_choice_symbol() + and sym.get_parent().get_selection() is sym'.""" + return self.is_choice_symbol_ and self.parent.get_selection() is self + + def __str__(self): + """Returns a string containing various information about the symbol.""" + return self.config._get_sym_or_choice_str(self) + + # + # Private methods + # + + def __init__(self): + """Symbol constructor -- not intended to be called directly by + kconfiglib clients.""" + + # Set default values + _HasVisibility.__init__(self) + + self.config = None + + self.parent = None + self.name = None + self.type = UNKNOWN + + self.def_exprs = [] + self.ranges = [] + self.rev_dep = "n" + + # The prompt, default value and select conditions without any + # dependencies from menus or if's propagated to them + + self.orig_prompts = [] + self.orig_def_exprs = [] + self.orig_selects = [] + + # Dependencies inherited from containing menus and if's + self.deps_from_containing = None + + self.help = None + + # The set of symbols referenced by this symbol (see + # get_referenced_symbols()) + self.referenced_syms = set() + + # The set of symbols selected by this symbol (see + # get_selected_symbols()) + self.selected_syms = set() + + # Like 'referenced_syms', but includes symbols from + # dependencies inherited from enclosing menus and if's + self.all_referenced_syms = set() + + # This is set to True for "actual" choice symbols. See + # Choice._determine_actual_symbols(). The trailing underscore avoids a + # collision with is_choice_symbol(). + self.is_choice_symbol_ = False + + # This records only dependencies specified with 'depends on'. Needed + # when determining actual choice items (hrrrr...). See also + # Choice._determine_actual_symbols(). + self.menu_dep = None + + # See Symbol.get_ref/def_locations(). + self.def_locations = [] + self.ref_locations = [] + + self.user_val = None + + # Flags + + # Should the symbol get an entry in .config? + self.write_to_conf = False + + # Caches the calculated value + self.cached_value = None + + # Note: An instance variable 'self.dep' gets set on the Symbol in + # Config._build_dep(), linking the symbol to the symbols that + # immediately depend on it (in a caching/invalidation sense). The total + # set of dependent symbols for the symbol (the transitive closure) is + # calculated on an as-needed basis in _get_dependent(). + + # Caches the total list of dependent symbols. Calculated in + # _get_dependent(). + self.cached_deps = None + + # Does the symbol have an entry in the Kconfig file? The trailing + # underscore avoids a collision with is_defined(). + self.is_defined_ = False + + # Does the symbol get its value in some special way, e.g. from the + # environment or by being one of the special symbols n, m, and y? If + # so, the value is stored in self.cached_value, which is never + # invalidated. The trailing underscore avoids a collision with + # is_special(). + self.is_special_ = False + + # Does the symbol get its value from the environment? + self.is_from_env = False + + def _invalidate(self): + if self.is_special_: + return + + if self.is_choice_symbol_: + self.parent._invalidate() + + _HasVisibility._invalidate(self) + + self.write_to_conf = False + self.cached_value = None + + def _invalidate_dependent(self): + for sym in self._get_dependent(): + sym._invalidate() + + def _set_user_value_no_invalidate(self, v, suppress_load_warnings): + """Like set_user_value(), but does not invalidate any symbols. + + suppress_load_warnings -- + some warnings are annoying when loading a .config that can be helpful + when manually invoking set_user_value(). This flag is set to True to + suppress such warnings. + + Perhaps this could be made optional for load_config() instead.""" + + if self.is_special_: + if self.is_from_env: + self.config._warn('attempt to assign the value "{0}" to the ' + 'symbol {1}, which gets its value from the ' + 'environment. Assignment ignored.' + .format(v, self.name)) + else: + self.config._warn('attempt to assign the value "{0}" to the ' + 'special symbol {1}. Assignment ignored.' + .format(v, self.name)) + + return + + + if not self.is_defined_: + filename, linenr = self.ref_locations[0] + + self.config._undef_assign('attempt to assign the value "{0}" to {1}, ' + "which is referenced at {2}:{3} but never " + "defined. Assignment ignored." + .format(v, self.name, filename, linenr)) + return + + # Check if the value is valid for our type + + if not (( self.type == BOOL and (v == "n" or v == "y") ) or + ( self.type == TRISTATE and (v == "n" or v == "m" or + v == "y") ) or + ( self.type == STRING ) or + ( self.type == INT and _is_base_n(v, 10) ) or + ( self.type == HEX and _is_base_n(v, 16) )): + + self.config._warn('the value "{0}" is invalid for {1}, which has type {2}. ' + "Assignment ignored." + .format(v, self.name, typename[self.type])) + return + + if self.prompts == [] and not suppress_load_warnings: + self.config._warn('assigning "{0}" to the symbol {1} which ' + 'lacks prompts and thus has visibility "n". ' + 'The assignment will have no effect.' + .format(v, self.name)) + + self.user_val = v + + if self.is_choice_symbol_ and (self.type == BOOL or + self.type == TRISTATE): + choice = self.parent + if v == "y": + choice.user_val = self + choice.user_mode = "y" + elif v == "m": + choice.user_val = None + choice.user_mode = "m" + + def _unset_user_value_no_recursive_invalidate(self): + self._invalidate() + self.user_val = None + + if self.is_choice_symbol_: + self.parent._unset_user_value() + + def _make_conf(self): + if self.already_written: + return [] + + self.already_written = True + + # Note: write_to_conf is determined in get_value() + val = self.get_value() + if not self.write_to_conf: + return [] + + if self.type == BOOL or self.type == TRISTATE: + if val == "m" or val == "y": + return ["CONFIG_{0}={1}".format(self.name, val)] + return ["# CONFIG_{0} is not set".format(self.name)] + + elif self.type == STRING: + # Escape \ and " + return ['CONFIG_{0}="{1}"' + .format(self.name, + val.replace("\\", "\\\\").replace('"', '\\"'))] + + elif self.type == INT or self.type == HEX: + return ["CONFIG_{0}={1}".format(self.name, val)] + + else: + _internal_error('Internal error while creating .config: unknown type "{0}".' + .format(self.type)) + + def _get_dependent(self): + """Returns the set of symbols that should be invalidated if the value + of the symbol changes, because they might be affected by the change. + Note that this is an internal API -- it's probably of limited + usefulness to clients.""" + if self.cached_deps is not None: + return self.cached_deps + + res = set() + + self._add_dependent_ignore_siblings(res) + if self.is_choice_symbol_: + for s in self.parent.get_symbols(): + if s is not self: + res.add(s) + s._add_dependent_ignore_siblings(res) + + self.cached_deps = res + return res + + def _add_dependent_ignore_siblings(self, to): + """Calculating dependencies gets a bit tricky for choice items as they + all depend on each other, potentially leading to infinite recursion. + This helper function calculates dependencies ignoring the other symbols + in the choice. It also works fine for symbols that are not choice + items.""" + for s in self.dep: + to.add(s) + to |= s._get_dependent() + + def _has_auto_menu_dep_on(self, on): + """See Choice._determine_actual_symbols().""" + if not isinstance(self.parent, Choice): + _internal_error("Attempt to determine auto menu dependency for symbol ouside of choice.") + + if self.prompts == []: + # If we have no prompt, use the menu dependencies instead (what was + # specified with 'depends on') + return self.menu_dep is not None and \ + self.config._expr_depends_on(self.menu_dep, on) + + for (_, cond_expr) in self.prompts: + if self.config._expr_depends_on(cond_expr, on): + return True + + return False + +class Menu(Item): + + """Represents a menu statement.""" + + # + # Public interface + # + + def get_config(self): + """Return the Config instance this menu is from.""" + return self.config + + def get_visibility(self): + """Returns the visibility of the menu. This also affects the visibility + of subitems. See also Symbol.get_visibility().""" + return self.config._eval_expr(self.dep_expr) + + def get_visible_if_visibility(self): + """Returns the visibility the menu gets from its 'visible if' + condition. "y" if the menu has no 'visible if' condition.""" + return self.config._eval_expr(self.visible_if_expr) + + def get_items(self, recursive = False): + """Returns a list containing the items (symbols, menus, choice + statements and comments) in in the menu, in the same order that the + items appear within the menu. + + recursive (default: False) -- True if items contained in items within + the menu should be included + recursively (preorder).""" + + if not recursive: + return self.block.get_items() + + res = [] + for item in self.block.get_items(): + res.append(item) + if isinstance(item, Menu): + res.extend(item.get_items(True)) + elif isinstance(item, Choice): + res.extend(item.get_items()) + return res + + def get_symbols(self, recursive = False): + """Returns a list containing the symbols in the menu, in the same order + that they appear within the menu. + + recursive (default: False) -- True if symbols contained in items within + the menu should be included + recursively.""" + + return [item for item in self.get_items(recursive) if isinstance(item, Symbol)] + + def get_title(self): + """Returns the title text of the menu.""" + return self.title + + def get_parent(self): + """Returns the menu or choice statement that contains the menu, or + None if the menu is at the top level. Note that if statements are + treated as syntactic sugar and do not have an explicit class + representation.""" + return self.parent + + def get_referenced_symbols(self, refs_from_enclosing = False): + """See Symbol.get_referenced_symbols().""" + return self.all_referenced_syms if refs_from_enclosing else self.referenced_syms + + def get_location(self): + """Returns the location of the menu as a (filename, linenr) tuple, + where filename is a string and linenr an int.""" + return (self.filename, self.linenr) + + def __str__(self): + """Returns a string containing various information about the menu.""" + depends_on_str = self.config._expr_val_str(self.orig_deps, + "(no dependencies)") + visible_if_str = self.config._expr_val_str(self.visible_if_expr, + "(no dependencies)") + + additional_deps_str = " " + self.config._expr_val_str(self.deps_from_containing, + "(no additional dependencies)") + + return _sep_lines("Menu", + "Title : " + self.title, + "'depends on' dependencies : " + depends_on_str, + "'visible if' dependencies : " + visible_if_str, + "Additional dependencies from enclosing menus and if's:", + additional_deps_str, + "Location: {0}:{1}".format(self.filename, self.linenr)) + + # + # Private methods + # + + def __init__(self): + """Menu constructor -- not intended to be called directly by + kconfiglib clients.""" + + self.config = None + + self.parent = None + self.title = None + self.block = None + self.dep_expr = None + + # Dependency expression without dependencies from enclosing menus and + # if's propagated + self.orig_deps = None + + # Dependencies inherited from containing menus and if's + self.deps_from_containing = None + + # The 'visible if' expression + self.visible_if_expr = None + + # The set of symbols referenced by this menu (see + # get_referenced_symbols()) + self.referenced_syms = set() + + # Like 'referenced_syms', but includes symbols from + # dependencies inherited from enclosing menus and if's + self.all_referenced_syms = None + + self.filename = None + self.linenr = None + + def _make_conf(self): + item_conf = self.block._make_conf() + + if self.config._eval_expr(self.dep_expr) != "n" and \ + self.config._eval_expr(self.visible_if_expr) != "n": + return ["\n#\n# {0}\n#".format(self.title)] + item_conf + return item_conf + +class Choice(Item, _HasVisibility): + + """Represents a choice statement. A choice can be in one of three modes: + + "n" - The choice is not visible and no symbols can be selected. + + "m" - Any number of symbols can be set to "m". The rest will be "n". This + is safe since potentially conflicting options don't actually get + compiled into the kernel simultaneously with "m". + + "y" - One symbol will be "y" while the rest are "n". + + Only tristate choices can be in "m" mode, and the visibility of the choice + is an upper bound on the mode, so that e.g. a choice that depends on a + symbol with value "m" will be in "m" mode. + + The mode changes automatically when a value is assigned to a symbol within + the choice. + + See Symbol.get_visibility() too.""" + + # + # Public interface + # + + def get_selection(self): + """Returns the symbol selected (either by the user or through + defaults), or None if either no symbol is selected or the mode is not + "y".""" + if self.cached_selection is not None: + if self.cached_selection == NO_SELECTION: + return None + return self.cached_selection + + if self.get_mode() != "y": + return self._cache_ret(None) + + # User choice available? + if self.user_val is not None and \ + self.user_val._get_visibility() == "y": + return self._cache_ret(self.user_val) + + if self.optional: + return self._cache_ret(None) + + return self._cache_ret(self.get_selection_from_defaults()) + + def get_selection_from_defaults(self): + """Like Choice.get_selection(), but acts as if no symbol has been + selected by the user and no 'optional' flag is in effect.""" + + if self.actual_symbols == []: + return None + + for (symbol, cond_expr) in self.def_exprs: + if self.config._eval_expr(cond_expr) != "n": + chosen_symbol = symbol + break + else: + chosen_symbol = self.actual_symbols[0] + + # Is the chosen symbol visible? + if chosen_symbol._get_visibility() != "n": + return chosen_symbol + # Otherwise, pick the first visible symbol + for sym in self.actual_symbols: + if sym._get_visibility() != "n": + return sym + return None + + def get_user_selection(self): + """If the choice is in "y" mode and has a user-selected symbol, returns + that symbol. Otherwise, returns None.""" + return self.user_val + + def get_config(self): + """Returns the Config instance this choice is from.""" + return self.config + + def get_name(self): + """For named choices, returns the name. Returns None for unnamed + choices. No named choices appear anywhere in the kernel Kconfig files + as of Linux 3.7.0-rc8.""" + return self.name + + def get_prompts(self): + """Returns a list of prompts defined for the choice, in the order they + appear in the configuration files. Returns the empty list for choices + with no prompt. + + This list will have a single entry for the vast majority of choices + having prompts, but having multiple prompts for a single choice is + possible through having multiple 'choice' entries for it (though I'm + not sure if that ever happens in practice).""" + return [prompt for prompt, _ in self.orig_prompts] + + def get_help(self): + """Returns the help text of the choice, or None if the choice has no + help text.""" + return self.help + + def get_type(self): + """Returns the type of the choice. See Symbol.get_type().""" + return self.type + + def get_items(self): + """Gets all items contained in the choice in the same order as within + the configuration ("items" instead of "symbols" since choices and + comments might appear within choices. This only happens in one place as + of Linux 3.7.0-rc8, in drivers/usb/gadget/Kconfig).""" + return self.block.get_items() + + def get_symbols(self): + """Returns a list containing the choice's symbols. + + A quirk (perhaps a bug) of Kconfig is that you can put items within a + choice that will not be considered members of the choice insofar as + selection is concerned. This happens for example if one symbol within a + choice 'depends on' the symbol preceding it, or if you put non-symbol + items within choices. + + As of Linux 3.7.0-rc8, this seems to be used intentionally in one + place: drivers/usb/gadget/Kconfig. + + This function returns the "proper" symbols of the choice in the order + they appear in the choice, excluding such items. If you want all items + in the choice, use get_items().""" + return self.actual_symbols + + def get_parent(self): + """Returns the menu or choice statement that contains the choice, or + None if the choice is at the top level. Note that if statements are + treated as syntactic sugar and do not have an explicit class + representation.""" + return self.parent + + def get_referenced_symbols(self, refs_from_enclosing = False): + """See Symbol.get_referenced_symbols().""" + return self.all_referenced_syms if refs_from_enclosing else self.referenced_syms + + def get_def_locations(self): + """Returns a list of (filename, linenr) tuples, where filename (string) + and linenr (int) represent a location where the choice is defined. For + the vast majority of choices (all of them as of Linux 3.7.0-rc8) this + list will only contain one element, but its possible for named choices + to be defined in multiple locations.""" + return self.def_locations + + def get_visibility(self): + """Returns the visibility of the choice statement: one of "n", "m" or + "y". This acts as an upper limit on the mode of the choice (though bool + choices can only have the mode "y"). See the class documentation for an + explanation of modes.""" + return self._get_visibility() + + def get_mode(self): + """Returns the mode of the choice. See the class documentation for + an explanation of modes.""" + minimum_mode = "n" if self.optional else "m" + mode = self.user_mode if self.user_mode is not None else minimum_mode + mode = self.config._eval_min(mode, self._get_visibility()) + + # Promote "m" to "y" for boolean choices + if mode == "m" and self.type == BOOL: + return "y" + + return mode + + def is_optional(self): + """Returns True if the symbol has the optional flag set (and so will default + to "n" mode). Otherwise, returns False.""" + return self.optional + + def __str__(self): + """Returns a string containing various information about the choice + statement.""" + return self.config._get_sym_or_choice_str(self) + + # + # Private methods + # + + def __init__(self): + """Choice constructor -- not intended to be called directly by + kconfiglib clients.""" + + _HasVisibility.__init__(self) + + self.config = None + + self.parent = None + self.name = None # Yes, choices can be named + self.type = UNKNOWN + self.def_exprs = [] + self.help = None + self.optional = False + self.block = None + + # The prompts and default values without any dependencies from + # enclosing menus or if's propagated + + self.orig_prompts = [] + self.orig_def_exprs = [] + + # Dependencies inherited from containing menus and if's + self.deps_from_containing = None + + # We need to filter out symbols that appear within the choice block but + # are not considered choice items (see + # Choice._determine_actual_symbols()) This list holds the "actual" choice + # items. + self.actual_symbols = [] + + # The set of symbols referenced by this choice (see + # get_referenced_symbols()) + self.referenced_syms = set() + + # Like 'referenced_syms', but includes symbols from + # dependencies inherited from enclosing menus and if's + self.all_referenced_syms = set() + + # See Choice.get_def_locations() + self.def_locations = [] + + self.user_val = None + self.user_mode = None + + self.cached_selection = None + + def _determine_actual_symbols(self): + """If a symbol's visibility depends on the preceding symbol within a + choice, it is no longer viewed as a choice item (quite possibly a bug, + but some things consciously use it.. ugh. It stems from automatic + submenu creation). In addition, it's possible to have choices and + comments within choices, and those shouldn't be considered as choice + items either. Only drivers/usb/gadget/Kconfig seems to depend on any of + this. This method computes the "actual" items in the choice and sets + the is_choice_symbol_ flag on them (retrieved via is_choice_symbol()). + + Don't let this scare you: an earlier version simply checked for a + sequence of symbols where all symbols after the first appeared in the + 'depends on' expression of the first, and that worked fine. The added + complexity is to be future-proof in the event that + drivers/usb/gadget/Kconfig turns even more sinister. It might very well + be overkilling things (especially if that file is refactored ;).""" + + items = self.block.get_items() + + # Items might depend on each other in a tree structure, so we need a + # stack to keep track of the current tentative parent + stack = [] + + for item in items: + if not isinstance(item, Symbol): + stack = [] + continue + + while stack != []: + if item._has_auto_menu_dep_on(stack[-1]): + # The item should not be viewed as a choice item, so don't + # set item.is_choice_symbol_. + stack.append(item) + break + else: + stack.pop() + else: + item.is_choice_symbol_ = True + self.actual_symbols.append(item) + stack.append(item) + + def _cache_ret(self, selection): + # As None is used to indicate the lack of a cached value we can't use + # that to cache the fact that the choice has no selection. Instead, we + # use the symbolic constant NO_SELECTION. + if selection is None: + self.cached_selection = NO_SELECTION + else: + self.cached_selection = selection + + return selection + + def _invalidate(self): + _HasVisibility._invalidate(self) + self.cached_selection = None + + def _unset_user_value(self): + self._invalidate() + self.user_val = None + self.user_mode = None + + def _make_conf(self): + return self.block._make_conf() + +class Comment(Item): + + """Represents a comment statement.""" + + # + # Public interface + # + + def get_config(self): + """Returns the Config instance this comment is from.""" + return self.config + + def get_visibility(self): + """Returns the visibility of the comment. See also + Symbol.get_visibility().""" + return self.config._eval_expr(self.dep_expr) + + def get_text(self): + """Returns the text of the comment.""" + return self.text + + def get_parent(self): + """Returns the menu or choice statement that contains the comment, or + None if the comment is at the top level. Note that if statements are + treated as syntactic sugar and do not have an explicit class + representation.""" + return self.parent + + def get_referenced_symbols(self, refs_from_enclosing = False): + """See Symbol.get_referenced_symbols().""" + return self.all_referenced_syms if refs_from_enclosing else self.referenced_syms + + def get_location(self): + """Returns the location of the comment as a (filename, linenr) tuple, + where filename is a string and linenr an int.""" + return (self.filename, self.linenr) + + def __str__(self): + """Returns a string containing various information about the comment.""" + dep_str = self.config._expr_val_str(self.orig_deps, "(no dependencies)") + + additional_deps_str = " " + self.config._expr_val_str(self.deps_from_containing, + "(no additional dependencies)") + + return _sep_lines("Comment", + "Text: " + str(self.text), + "Dependencies: " + dep_str, + "Additional dependencies from enclosing menus and if's:", + additional_deps_str, + "Location: {0}:{1}".format(self.filename, self.linenr)) + + # + # Private methods + # + + def __init__(self): + """Comment constructor -- not intended to be called directly by + kconfiglib clients.""" + + self.config = None + + self.parent = None + self.text = None + self.dep_expr = None + + # Dependency expression without dependencies from enclosing menus and + # if's propagated + self.orig_deps = None + + # Dependencies inherited from containing menus and if's + self.deps_from_containing = None + + # The set of symbols referenced by this comment (see + # get_referenced_symbols()) + self.referenced_syms = set() + + # Like 'referenced_syms', but includes symbols from + # dependencies inherited from enclosing menus and if's + self.all_referenced_syms = None + + self.filename = None + self.linenr = None + + def _make_conf(self): + if self.config._eval_expr(self.dep_expr) != "n": + return ["\n#\n# {0}\n#".format(self.text)] + return [] + +class _Feed: + + """Class for working with sequences in a stream-like fashion; handy for tokens.""" + + def __init__(self, items): + self.items = items + self.length = len(self.items) + self.i = 0 + + def get_next(self): + if self.i >= self.length: + return None + + item = self.items[self.i] + self.i += 1 + return item + + def peek_next(self): + return None if self.i >= self.length else self.items[self.i] + + def go_to_start(self): + self.i = 0 + + def __getitem__(self, index): + return self.items[index] + + def __len__(self): + return len(self.items) + + def is_empty(self): + return self.items == [] + + def check(self, token): + """Check if the next token is 'token'. If so, remove it from the token + feed and return True. Otherwise, leave it in and return False.""" + if self.i >= self.length: + return None + + if self.items[self.i] == token: + self.i += 1 + return True + + return False + + def remove_while(self, pred): + while self.i < self.length and pred(self.items[self.i]): + self.i += 1 + + def go_back(self): + if self.i <= 0: + _internal_error("Attempt to move back in Feed while already at the beginning.") + self.i -= 1 + +class _FileFeed(_Feed): + + """Feed subclass that keeps track of the current filename and line + number.""" + + def __init__(self, lines, filename): + self.filename = _clean_up_path(filename) + _Feed.__init__(self, lines) + + def get_filename(self): + return self.filename + + def get_linenr(self): + return self.i + +# +# Misc. public global utility functions +# + +def tri_less(v1, v2): + """Returns True if the tristate v1 is less than the tristate v2, where "n", + "m" and "y" are ordered from lowest to highest. Otherwise, returns + False.""" + return tri_to_int[v1] < tri_to_int[v2] + +def tri_less_eq(v1, v2): + """Returns True if the tristate v1 is less than or equal to the tristate + v2, where "n", "m" and "y" are ordered from lowest to highest. Otherwise, + returns False.""" + return tri_to_int[v1] <= tri_to_int[v2] + +def tri_greater(v1, v2): + """Returns True if the tristate v1 is greater than the tristate v2, where + "n", "m" and "y" are ordered from lowest to highest. Otherwise, returns + False.""" + return tri_to_int[v1] > tri_to_int[v2] + +def tri_greater_eq(v1, v2): + """Returns True if the tristate v1 is greater than or equal to the tristate + v2, where "n", "m" and "y" are ordered from lowest to highest. Otherwise, + returns False.""" + return tri_to_int[v1] >= tri_to_int[v2] + +# +# Helper functions, mostly related to text processing +# + +def _strip_quotes(s, line, filename, linenr): + """Removes any quotes surrounding 's' if it has them; otherwise returns 's' + unmodified.""" + s = s.strip() + if not s: + return "" + if s[0] == '"' or s[0] == "'": + if len(s) < 2 or s[-1] != s[0]: + _parse_error(line, + "malformed string literal", + filename, + linenr) + return s[1:-1] + return s + +def _indentation(line): + """Returns the indentation of the line, treating tab stops as being spaced + 8 characters apart.""" + if line.isspace(): + _internal_error("Attempt to take indentation of blank line.") + indent = 0 + for c in line: + if c == " ": + indent += 1 + elif c == "\t": + # Go to the next tab stop + indent = (indent + 8) & ~7 + else: + return indent + +def _deindent(line, indent): + """Deindent 'line' by 'indent' spaces.""" + line = line.expandtabs() + if len(line) <= indent: + return line + return line[indent:] + +def _is_base_n(s, n): + try: + int(s, n) + return True + except ValueError: + return False + +def _sep_lines(*args): + """Returns a string comprised of all arguments, with newlines inserted + between them.""" + return "\n".join(args) + +def _comment(s): + """Returns a new string with "#" inserted before each line in 's'.""" + if not s: + return "#" + res = "".join(["#" + line for line in s.splitlines(True)]) + if s.endswith("\n"): + return res + "#" + return res + +def _get_lines(filename): + """Returns a list of lines from 'filename', joining any line ending in \\ + with the following line.""" + with open(filename, "r") as f: + lines = [] + accum = "" + while 1: + line = f.readline() + + if line == "": + return lines + + if line.endswith("\\\n"): + accum += line[:-2] + else: + accum += line + lines.append(accum) + accum = "" + +def _strip_trailing_slash(path): + """Removes any trailing slash from 'path'.""" + return path[:-1] if path.endswith("/") else path + +def _clean_up_path(path): + """Strips any initial "./" and trailing slash from 'path'.""" + if path.startswith("./"): + path = path[2:] + return _strip_trailing_slash(path) + +# +# Error handling +# + +class Kconfig_Syntax_Error(Exception): + """Exception raised for syntax errors.""" + pass + +class Internal_Error(Exception): + """Exception raised for internal errors.""" + pass + +def _tokenization_error(s, index, filename, linenr): + if filename is not None: + assert linenr is not None + sys.stderr.write("{0}:{1}:\n".format(filename, linenr)) + + if s.endswith("\n"): + s = s[:-1] + + # Calculate the visual offset corresponding to index 'index' in 's' + # assuming tabstops are spaced 8 characters apart + vis_index = 0 + for c in s[:index]: + if c == "\t": + vis_index = (vis_index + 8) & ~7 + else: + vis_index += 1 + + # Don't output actual tabs to be independent of how the terminal renders + # them + s = s.expandtabs() + + raise Kconfig_Syntax_Error, ( + _sep_lines("Error during tokenization at location indicated by caret.\n", + s, + " " * vis_index + "^\n")) + +def _parse_error(s, msg, filename, linenr): + error_str = "" + + if filename is not None: + assert linenr is not None + error_str += "{0}:{1}: ".format(filename, linenr) + + if s.endswith("\n"): + s = s[:-1] + + error_str += 'Error while parsing "{0}"'.format(s) + \ + ("." if msg is None else ": " + msg) + + raise Kconfig_Syntax_Error, error_str + +def _internal_error(msg): + msg += "\nSorry! You may want to send an email to kconfiglib@gmail.com " \ + "to tell me about this. Include the message above and the stack " \ + "trace and describe what you were doing." + + raise Internal_Error, msg + +if use_psyco: + import psyco + + Config._tokenize = psyco.proxy(Config._tokenize) + Config._eval_expr = psyco.proxy(Config._eval_expr) + + _indentation = psyco.proxy(_indentation) + _get_lines = psyco.proxy(_get_lines) |