__init__.py
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- """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 3057 2008/06/09 22:21:00 knight"
- 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))