--- /dev/null
+"""SCons.Scanner
+
+The Scanner package for the SCons software construction utility.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 3842 2008/12/20 22:59:52 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_contents())
+
+ def scan(self, node, path=()):
+
+ # cache the includes list in node so we only scan it once:
+ if node.includes != None:
+ includes = node.includes
+ else:
+ includes = self.find_include_names (node)
+ node.includes = 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)
+
+ return n, include[1]
+
+ def sort_key(self, include):
+ return SCons.Node.FS._my_normcase(string.join(include))
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