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#
# SPDX-License-Identifier: ISC
#
# 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__().
WARNING: A wart here is that scripts/kconfig/Makefile sometimes uses the
--defconfig=<defconfig> option when calling the C implementation of e.g.
'make defconfig'. This option overrides the 'option defconfig_list'
symbol, meaning the result from get_defconfig_filename() might not
match what 'make defconfig' would use. That probably ought to be worked
around somehow, so that this function always gives the "expected"
result."""
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 function 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,
deps,
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. "
"(Note that modules are still supported -- "
"Kconfiglib just assumes the symbol name "
"MODULES.)",
filename,
linenr)
elif tokens.check(T_ALLNOCONFIG_Y):
if not isinstance(stmt, Symbol):
_parse_error(line,
"the 'allnoconfig_y' option is only valid for symbols.",
filename,
linenr)
stmt.allnoconfig_y = True
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_ALLNOCONFIG_Y, T_ENV,
T_DEFCONFIG_LIST, T_MODULES, T_VISIBLE) = range(0, 39)
# 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,
"allnoconfig_y" : T_ALLNOCONFIG_Y,
"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-z0-9_]+")
# 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 is_allnoconfig_y(self):
"""Returns True if the symbol has the 'allnoconfig_y' option set;
otherwise, returns False."""
return self.allnoconfig_y
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
# Does the symbol have the 'allnoconfig_y' option set?
self.allnoconfig_y = 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)