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Diffstat (limited to 'engine/SCons/Scanner/__init__.py')
| -rw-r--r-- | engine/SCons/Scanner/__init__.py | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/engine/SCons/Scanner/__init__.py b/engine/SCons/Scanner/__init__.py new file mode 100644 index 0000000..7e72504 --- /dev/null +++ b/engine/SCons/Scanner/__init__.py @@ -0,0 +1,415 @@ +"""SCons.Scanner + +The Scanner package for the SCons software construction utility. + +""" + +# +# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be included +# in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY +# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE +# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +# + +__revision__ = "src/engine/SCons/Scanner/__init__.py 4577 2009/12/27 19:43:56 scons" + +import re +import string + +import SCons.Node.FS +import SCons.Util + + +class _Null: + pass + +# This is used instead of None as a default argument value so None can be +# used as an actual argument value. +_null = _Null + +def Scanner(function, *args, **kw): + """ + Public interface factory function for creating different types + of Scanners based on the different types of "functions" that may + be supplied. + + TODO: Deprecate this some day. We've moved the functionality + inside the Base class and really don't need this factory function + any more. It was, however, used by some of our Tool modules, so + the call probably ended up in various people's custom modules + patterned on SCons code. + """ + if SCons.Util.is_Dict(function): + return apply(Selector, (function,) + args, kw) + else: + return apply(Base, (function,) + args, kw) + + + +class FindPathDirs: + """A class to bind a specific *PATH variable name to a function that + will return all of the *path directories.""" + def __init__(self, variable): + self.variable = variable + def __call__(self, env, dir=None, target=None, source=None, argument=None): + import SCons.PathList + try: + path = env[self.variable] + except KeyError: + return () + + dir = dir or env.fs._cwd + path = SCons.PathList.PathList(path).subst_path(env, target, source) + return tuple(dir.Rfindalldirs(path)) + + + +class Base: + """ + The base class for dependency scanners. This implements + straightforward, single-pass scanning of a single file. + """ + + def __init__(self, + function, + name = "NONE", + argument = _null, + skeys = _null, + path_function = None, + node_class = SCons.Node.FS.Entry, + node_factory = None, + scan_check = None, + recursive = None): + """ + Construct a new scanner object given a scanner function. + + 'function' - a scanner function taking two or three + arguments and returning a list of strings. + + 'name' - a name for identifying this scanner object. + + 'argument' - an optional argument that, if specified, will be + passed to both the scanner function and the path_function. + + 'skeys' - an optional list argument that can be used to determine + which scanner should be used for a given Node. In the case of File + nodes, for example, the 'skeys' would be file suffixes. + + 'path_function' - a function that takes four or five arguments + (a construction environment, Node for the directory containing + the SConscript file that defined the primary target, list of + target nodes, list of source nodes, and optional argument for + this instance) and returns a tuple of the directories that can + be searched for implicit dependency files. May also return a + callable() which is called with no args and returns the tuple + (supporting Bindable class). + + 'node_class' - the class of Nodes which this scan will return. + If node_class is None, then this scanner will not enforce any + Node conversion and will return the raw results from the + underlying scanner function. + + 'node_factory' - the factory function to be called to translate + the raw results returned by the scanner function into the + expected node_class objects. + + 'scan_check' - a function to be called to first check whether + this node really needs to be scanned. + + 'recursive' - specifies that this scanner should be invoked + recursively on all of the implicit dependencies it returns + (the canonical example being #include lines in C source files). + May be a callable, which will be called to filter the list + of nodes found to select a subset for recursive scanning + (the canonical example being only recursively scanning + subdirectories within a directory). + + The scanner function's first argument will be a Node that should + be scanned for dependencies, the second argument will be an + Environment object, the third argument will be the tuple of paths + returned by the path_function, and the fourth argument will be + the value passed into 'argument', and the returned list should + contain the Nodes for all the direct dependencies of the file. + + Examples: + + s = Scanner(my_scanner_function) + + s = Scanner(function = my_scanner_function) + + s = Scanner(function = my_scanner_function, argument = 'foo') + + """ + + # Note: this class could easily work with scanner functions that take + # something other than a filename as an argument (e.g. a database + # node) and a dependencies list that aren't file names. All that + # would need to be changed is the documentation. + + self.function = function + self.path_function = path_function + self.name = name + self.argument = argument + + if skeys is _null: + if SCons.Util.is_Dict(function): + skeys = function.keys() + else: + skeys = [] + self.skeys = skeys + + self.node_class = node_class + self.node_factory = node_factory + self.scan_check = scan_check + if callable(recursive): + self.recurse_nodes = recursive + elif recursive: + self.recurse_nodes = self._recurse_all_nodes + else: + self.recurse_nodes = self._recurse_no_nodes + + def path(self, env, dir=None, target=None, source=None): + if not self.path_function: + return () + if not self.argument is _null: + return self.path_function(env, dir, target, source, self.argument) + else: + return self.path_function(env, dir, target, source) + + def __call__(self, node, env, path = ()): + """ + This method scans a single object. 'node' is the node + that will be passed to the scanner function, and 'env' is the + environment that will be passed to the scanner function. A list of + direct dependency nodes for the specified node will be returned. + """ + if self.scan_check and not self.scan_check(node, env): + return [] + + self = self.select(node) + + if not self.argument is _null: + list = self.function(node, env, path, self.argument) + else: + list = self.function(node, env, path) + + kw = {} + if hasattr(node, 'dir'): + kw['directory'] = node.dir + node_factory = env.get_factory(self.node_factory) + nodes = [] + for l in list: + if self.node_class and not isinstance(l, self.node_class): + l = apply(node_factory, (l,), kw) + nodes.append(l) + return nodes + + def __cmp__(self, other): + try: + return cmp(self.__dict__, other.__dict__) + except AttributeError: + # other probably doesn't have a __dict__ + return cmp(self.__dict__, other) + + def __hash__(self): + return id(self) + + def __str__(self): + return self.name + + def add_skey(self, skey): + """Add a skey to the list of skeys""" + self.skeys.append(skey) + + def get_skeys(self, env=None): + if env and SCons.Util.is_String(self.skeys): + return env.subst_list(self.skeys)[0] + return self.skeys + + def select(self, node): + if SCons.Util.is_Dict(self.function): + key = node.scanner_key() + try: + return self.function[key] + except KeyError: + return None + else: + return self + + def _recurse_all_nodes(self, nodes): + return nodes + + def _recurse_no_nodes(self, nodes): + return [] + + recurse_nodes = _recurse_no_nodes + + def add_scanner(self, skey, scanner): + self.function[skey] = scanner + self.add_skey(skey) + + +class Selector(Base): + """ + A class for selecting a more specific scanner based on the + scanner_key() (suffix) for a specific Node. + + TODO: This functionality has been moved into the inner workings of + the Base class, and this class will be deprecated at some point. + (It was never exposed directly as part of the public interface, + although it is used by the Scanner() factory function that was + used by various Tool modules and therefore was likely a template + for custom modules that may be out there.) + """ + def __init__(self, dict, *args, **kw): + apply(Base.__init__, (self, None,)+args, kw) + self.dict = dict + self.skeys = dict.keys() + + def __call__(self, node, env, path = ()): + return self.select(node)(node, env, path) + + def select(self, node): + try: + return self.dict[node.scanner_key()] + except KeyError: + return None + + def add_scanner(self, skey, scanner): + self.dict[skey] = scanner + self.add_skey(skey) + + +class Current(Base): + """ + A class for scanning files that are source files (have no builder) + or are derived files and are current (which implies that they exist, + either locally or in a repository). + """ + + def __init__(self, *args, **kw): + def current_check(node, env): + return not node.has_builder() or node.is_up_to_date() + kw['scan_check'] = current_check + apply(Base.__init__, (self,) + args, kw) + +class Classic(Current): + """ + A Scanner subclass to contain the common logic for classic CPP-style + include scanning, but which can be customized to use different + regular expressions to find the includes. + + Note that in order for this to work "out of the box" (without + overriding the find_include() and sort_key() methods), the regular + expression passed to the constructor must return the name of the + include file in group 0. + """ + + def __init__(self, name, suffixes, path_variable, regex, *args, **kw): + + self.cre = re.compile(regex, re.M) + + def _scan(node, env, path=(), self=self): + node = node.rfile() + if not node.exists(): + return [] + return self.scan(node, path) + + kw['function'] = _scan + kw['path_function'] = FindPathDirs(path_variable) + kw['recursive'] = 1 + kw['skeys'] = suffixes + kw['name'] = name + + apply(Current.__init__, (self,) + args, kw) + + def find_include(self, include, source_dir, path): + n = SCons.Node.FS.find_file(include, (source_dir,) + tuple(path)) + return n, include + + def sort_key(self, include): + return SCons.Node.FS._my_normcase(include) + + def find_include_names(self, node): + return self.cre.findall(node.get_text_contents()) + + def scan(self, node, path=()): + + # cache the includes list in node so we only scan it once: + if node.includes is not None: + includes = node.includes + else: + includes = self.find_include_names (node) + # Intern the names of the include files. Saves some memory + # if the same header is included many times. + node.includes = map(SCons.Util.silent_intern, includes) + + # This is a hand-coded DSU (decorate-sort-undecorate, or + # Schwartzian transform) pattern. The sort key is the raw name + # of the file as specifed on the #include line (including the + # " or <, since that may affect what file is found), which lets + # us keep the sort order constant regardless of whether the file + # is actually found in a Repository or locally. + nodes = [] + source_dir = node.get_dir() + if callable(path): + path = path() + for include in includes: + n, i = self.find_include(include, source_dir, path) + + if n is None: + SCons.Warnings.warn(SCons.Warnings.DependencyWarning, + "No dependency generated for file: %s (included from: %s) -- file not found" % (i, node)) + else: + sortkey = self.sort_key(include) + nodes.append((sortkey, n)) + + nodes.sort() + nodes = map(lambda pair: pair[1], nodes) + return nodes + +class ClassicCPP(Classic): + """ + A Classic Scanner subclass which takes into account the type of + bracketing used to include the file, and uses classic CPP rules + for searching for the files based on the bracketing. + + Note that in order for this to work, the regular expression passed + to the constructor must return the leading bracket in group 0, and + the contained filename in group 1. + """ + def find_include(self, include, source_dir, path): + if include[0] == '"': + paths = (source_dir,) + tuple(path) + else: + paths = tuple(path) + (source_dir,) + + n = SCons.Node.FS.find_file(include[1], paths) + + i = SCons.Util.silent_intern(include[1]) + return n, i + + def sort_key(self, include): + return SCons.Node.FS._my_normcase(string.join(include)) + +# Local Variables: +# tab-width:4 +# indent-tabs-mode:nil +# End: +# vim: set expandtab tabstop=4 shiftwidth=4: |