3 The Scanner package for the SCons software construction utility.
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30 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
42 # This is used instead of None as a default argument value so None can be
43 # used as an actual argument value.
46 def Scanner(function, *args, **kw):
47 """Public interface factory function for creating different types
48 of Scanners based on the different types of "functions" that may
50 if SCons.Util.is_Dict(function):
51 return apply(Selector, (function,) + args, kw)
53 return apply(Base, (function,) + args, kw)
56 """A class to bind a specific *PATH variable name and the fs object
57 to a function that will return all of the *path directories."""
58 def __init__(self, variable, fs):
59 self.variable = variable
61 def __call__(self, env, dir, argument=None):
63 path = env[self.variable]
67 return tuple(self.fs.Rsearchall(env.subst_path(path),
69 clazz = SCons.Node.FS.Dir,
74 The base class for dependency scanners. This implements
75 straightforward, single-pass scanning of a single file.
84 node_class = SCons.Node.FS.Entry,
85 node_factory = SCons.Node.FS.default_fs.File,
89 Construct a new scanner object given a scanner function.
91 'function' - a scanner function taking two or three
92 arguments and returning a list of strings.
94 'name' - a name for identifying this scanner object.
96 'argument' - an optional argument that, if specified, will be
97 passed to both the scanner function and the path_function.
99 'skeys' - an optional list argument that can be used to determine
100 which scanner should be used for a given Node. In the case of File
101 nodes, for example, the 'skeys' would be file suffixes.
103 'path_function' - a function that takes one to three arguments
104 (a construction environment, optional directory, and optional
105 argument for this instance) and returns a tuple of the
106 directories that can be searched for implicit dependency files.
108 'node_class' - the class of Nodes which this scan will return.
109 If node_class is None, then this scanner will not enforce any
110 Node conversion and will return the raw results from the
111 underlying scanner function.
113 'node_factory' - the factory function to be called to translate
114 the raw results returned by the scanner function into the
115 expected node_class objects.
117 'scan_check' - a function to be called to first check whether
118 this node really needs to be scanned.
120 'recursive' - specifies that this scanner should be invoked
121 recursively on the implicit dependencies it returns (the
122 canonical example being #include lines in C source files).
124 The scanner function's first argument will be the name of a file
125 that should be scanned for dependencies, the second argument will
126 be an Environment object, the third argument will be the value
127 passed into 'argument', and the returned list should contain the
128 Nodes for all the direct dependencies of the file.
132 s = Scanner(my_scanner_function)
134 s = Scanner(function = my_scanner_function)
136 s = Scanner(function = my_scanner_function, argument = 'foo')
140 # Note: this class could easily work with scanner functions that take
141 # something other than a filename as an argument (e.g. a database
142 # node) and a dependencies list that aren't file names. All that
143 # would need to be changed is the documentation.
145 self.function = function
146 self.path_function = path_function
148 self.argument = argument
150 self.node_class = node_class
151 self.node_factory = node_factory
152 self.scan_check = scan_check
153 self.recursive = recursive
155 def path(self, env, dir = None):
156 if not self.path_function:
158 if not self.argument is _null:
159 return self.path_function(env, dir, self.argument)
161 return self.path_function(env, dir)
163 def __call__(self, node, env, path = ()):
165 This method scans a single object. 'node' is the node
166 that will be passed to the scanner function, and 'env' is the
167 environment that will be passed to the scanner function. A list of
168 direct dependency nodes for the specified node will be returned.
170 if self.scan_check and not self.scan_check(node, env):
173 if not self.argument is _null:
174 list = self.function(node, env, path, self.argument)
176 list = self.function(node, env, path)
178 if hasattr(node, 'dir'):
179 kw['directory'] = node.dir
182 if self.node_class and not isinstance(l, self.node_class):
183 l = apply(self.node_factory, (l,), kw)
187 def __cmp__(self, other):
188 return cmp(self.__dict__, other.__dict__)
191 return hash(repr(self))
193 def add_skey(self, skey):
194 """Add a skey to the list of skeys"""
195 self.skeys.append(skey)
197 def get_skeys(self, env=None):
198 if SCons.Util.is_String(self.skeys):
199 return env.subst_list(self.skeys)[0]
202 def select(self, node):
206 class Selector(Base):
208 A class for selecting a more specific scanner based on the
209 scanner_key() (suffix) for a specific Node.
211 def __init__(self, dict, *args, **kw):
212 Base.__init__(self, (None,)+args, kw)
215 def __call__(self, node, env, path = ()):
216 return self.select(node)(node, env, path)
218 def select(self, node):
220 return self.dict[node.scanner_key()]
224 def add_scanner(self, skey, scanner):
225 self.dict[skey] = scanner
230 A class for scanning files that are source files (have no builder)
231 or are derived files and are current (which implies that they exist,
232 either locally or in a repository).
235 def __init__(self, *args, **kw):
236 def current_check(node, env):
237 calc = env.get_calculator()
238 c = not node.has_builder() or node.current(env.get_calculator())
240 kw['scan_check'] = current_check
241 apply(Base.__init__, (self,) + args, kw)
243 class Classic(Current):
245 A Scanner subclass to contain the common logic for classic CPP-style
246 include scanning, but which can be customized to use different
247 regular expressions to find the includes.
249 Note that in order for this to work "out of the box" (without
250 overriding the find_include() method), the regular expression passed
251 to the constructor must return the name of the include file in group
255 def __init__(self, name, suffixes, path_variable, regex,
256 fs=SCons.Node.FS.default_fs, *args, **kw):
258 self.cre = re.compile(regex, re.M)
261 def _scan(node, env, path, self=self, fs=fs):
262 return self.scan(node, env, path)
264 kw['function'] = _scan
265 kw['path_function'] = FindPathDirs(path_variable, fs)
267 kw['skeys'] = suffixes
270 apply(Current.__init__, (self,) + args, kw)
272 def find_include(self, include, source_dir, path):
273 n = SCons.Node.FS.find_file(include, (source_dir,) + path, self.fs.File)
276 def scan(self, node, env, path=()):
279 if not node.exists():
282 # cache the includes list in node so we only scan it once:
283 if node.includes != None:
284 includes = node.includes
286 includes = self.cre.findall(node.get_contents())
287 node.includes = includes
290 source_dir = node.get_dir()
291 for include in includes:
292 n, i = self.find_include(include, source_dir, path)
297 SCons.Warnings.warn(SCons.Warnings.DependencyWarning,
298 "No dependency generated for file: %s (included from: %s) -- file not found" % (i, node))
300 # Schwartzian transform from the Python FAQ Wizard
301 def st(List, Metric):
302 def pairing(element, M = Metric):
303 return (M(element), element)
306 paired = map(pairing, List)
308 return map(stripit, paired)
311 # We don't want the order of includes to be
312 # modified by case changes on case insensitive OSes, so
313 # normalize the case of the filename here:
314 # (see test/win32pathmadness.py for a test of this)
315 return SCons.Node.FS._my_normcase(str(node))
317 transformed = st(nodes, normalize)
318 # print "Classic: " + str(node) + " => " + str(map(lambda x: str(x),list(transformed)))
321 class ClassicCPP(Classic):
323 A Classic Scanner subclass which takes into account the type of
324 bracketing used to include the file, and uses classic CPP rules
325 for searching for the files based on the bracketing.
327 Note that in order for this to work, the regular expression passed
328 to the constructor must return the leading bracket in group 0, and
329 the contained filename in group 1.
331 def find_include(self, include, source_dir, path):
332 if include[0] == '"':
333 n = SCons.Node.FS.find_file(include[1],
334 (source_dir,) + path,
337 n = SCons.Node.FS.find_file(include[1],
338 path + (source_dir,),