8 # Copyright (c) 2001, 2002 Steven Knight
10 # Permission is hereby granted, free of charge, to any person obtaining
11 # a copy of this software and associated documentation files (the
12 # "Software"), to deal in the Software without restriction, including
13 # without limitation the rights to use, copy, modify, merge, publish,
14 # distribute, sublicense, and/or sell copies of the Software, and to
15 # permit persons to whom the Software is furnished to do so, subject to
16 # the following conditions:
18 # The above copyright notice and this permission notice shall be included
19 # in all copies or substantial portions of the Software.
21 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
22 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
23 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
61 except AttributeError:
64 def SetCommandHandler(func, escape = lambda x: x):
65 raise SCons.Errors.UserError("SetCommandHandler() is no longer supported, use the SPAWN and ESCAPE construction variables.")
67 def GetCommandHandler():
68 raise SCons.Errors.UserError("GetCommandHandler() is no longer supported, use the SPAWN construction variable.")
70 class CommandGenerator:
72 Wraps a command generator function so the Action() factory
73 function can tell a generator function from a function action.
75 def __init__(self, generator):
76 self.generator = generator
78 def _do_create_action(act, strfunction=_null):
79 """This is the actual "implementation" for the
80 Action factory method, below. This handles the
81 fact that passing lists to Action() itself has
82 different semantics than passing lists as elements
85 The former will create a ListAction, the latter
86 will create a CommandAction by converting the inner
87 list elements to strings."""
89 if isinstance(act, ActionBase):
91 elif SCons.Util.is_List(act):
92 return CommandAction(act)
93 elif isinstance(act, CommandGenerator):
94 return CommandGeneratorAction(act.generator)
96 return FunctionAction(act, strfunction=strfunction)
97 elif SCons.Util.is_String(act):
98 var=SCons.Util.get_environment_var(act)
100 # This looks like a string that is purely an Environment
101 # variable reference, like "$FOO" or "${FOO}". We do
102 # something special here...we lazily evaluate the contents
103 # of that Environment variable, so a user could but something
104 # like a function or a CommandGenerator in that variable
105 # instead of a string.
106 return CommandGeneratorAction(LazyCmdGenerator(var))
107 listCmds = map(lambda x: CommandAction(string.split(x)),
108 string.split(act, '\n'))
109 if len(listCmds) == 1:
112 return ListAction(listCmds)
116 def Action(act, strfunction=_null):
117 """A factory for action objects."""
118 if SCons.Util.is_List(act):
119 acts = map(lambda x, s=strfunction: _do_create_action(x, s), act)
120 acts = filter(lambda x: not x is None, acts)
124 return ListAction(acts)
126 return _do_create_action(act, strfunction=strfunction)
129 """Base class for actions that create output objects."""
130 def __cmp__(self, other):
131 return cmp(self.__dict__, other.__dict__)
133 def show(self, string):
136 def get_actions(self):
139 def subst_dict(self, target, source, env):
140 """Create a dictionary for substitution of construction
143 This translates the following special arguments:
145 env - the construction environment itself,
146 the values of which (CC, CCFLAGS, etc.)
147 are copied straight into the dictionary
149 target - the target (object or array of objects),
150 used to generate the TARGET and TARGETS
151 construction variables
153 source - the source (object or array of objects),
154 used to generate the SOURCES and SOURCE
155 construction variables
160 for k,v in env.items(): dict[k] = v
162 if not SCons.Util.is_List(target):
165 dict['TARGETS'] = SCons.Util.PathList(map(os.path.normpath, map(str, target)))
167 dict['TARGET'] = dict['TARGETS'][0]
172 except AttributeError:
174 if not SCons.Util.is_List(source):
176 dict['SOURCES'] = SCons.Util.PathList(map(os.path.normpath, map(rstr, source)))
178 dict['SOURCE'] = dict['SOURCES'][0]
182 def _string_from_cmd_list(cmd_list):
183 """Takes a list of command line arguments and returns a pretty
184 representation for printing."""
186 for arg in map(str, cmd_list):
187 if ' ' in arg or '\t' in arg:
188 arg = '"' + arg + '"'
190 return string.join(cl)
192 _rm = re.compile(r'\$[()]')
193 _remove = re.compile(r'\$\(([^\$]|\$[^\(])*?\$\)')
195 class CommandAction(ActionBase):
196 """Class for command-execution actions."""
197 def __init__(self, cmd):
200 def __call__(self, target, source, env):
201 """Execute a command action.
203 This will handle lists of commands as well as individual commands,
204 because construction variable substitution may turn a single
205 "command" into a list. This means that this class can actually
206 handle lists of commands, even though that's not how we use it
211 escape = env.get('ESCAPE', lambda x: x)
213 if env.has_key('SHELL'):
216 raise SCons.Errors.UserError('Missing SHELL construction variable.')
218 if env.has_key('SPAWN'):
221 raise SCons.Errors.UserError('Missing SPAWN construction variable.')
223 dict = self.subst_dict(target, source, env)
224 cmd_list = SCons.Util.scons_subst_list(self.cmd_list, dict, {}, _rm)
225 for cmd_line in cmd_list:
228 self.show(_string_from_cmd_list(cmd_line))
235 import SCons.Environment
236 default_ENV = SCons.Environment.Environment()['ENV']
238 # Escape the command line for the command
239 # interpreter we are using
240 map(lambda x, e=escape: x.escape(e), cmd_line)
241 cmd_line = map(str, cmd_line)
242 ret = spawn(shell, escape, cmd_line[0], cmd_line, ENV)
247 def _sig_dict(self, target, source, env):
248 """Supply a dictionary for use in computing signatures.
250 For signature purposes, it doesn't matter what targets or
251 sources we use, so long as we use the same ones every time
252 so the signature stays the same. We supply an array of two
253 of each to allow for distinction between TARGET and TARGETS.
255 return self.subst_dict(['__t1__', '__t2__'], ['__s1__', '__s2__'], env)
257 def get_raw_contents(self, target, source, env):
258 """Return the complete contents of this action's command line.
260 return SCons.Util.scons_subst(string.join(self.cmd_list),
261 self._sig_dict(target, source, env), {})
263 def get_contents(self, target, source, env):
264 """Return the signature contents of this action's command line.
266 This strips $(-$) and everything in between the string,
267 since those parts don't affect signatures.
269 return SCons.Util.scons_subst(string.join(map(str, self.cmd_list)),
270 self._sig_dict(target, source, env), {}, _remove)
272 class CommandGeneratorAction(ActionBase):
273 """Class for command-generator actions."""
274 def __init__(self, generator):
275 self.generator = generator
277 def __generate(self, target, source, env, for_signature):
278 # ensure that target is a list, to make it easier to write
279 # generator functions:
280 if not SCons.Util.is_List(target):
283 ret = self.generator(target=target, source=source, env=env, for_signature=for_signature)
284 gen_cmd = Action(ret)
286 raise SCons.Errors.UserError("Object returned from command generator: %s cannot be used to create an Action." % repr(ret))
289 def __call__(self, target, source, env):
290 if not SCons.Util.is_List(source):
292 rsources = map(rfile, source)
293 act = self.__generate(target, source, env, 0)
294 return act(target, rsources, env)
296 def get_contents(self, target, source, env):
297 """Return the signature contents of this action's command line.
299 This strips $(-$) and everything in between the string,
300 since those parts don't affect signatures.
302 return self.__generate(target, source, env, 1).get_contents(target, source, env)
304 class LazyCmdGenerator:
305 """This is a simple callable class that acts as a command generator.
306 It holds on to a key into an Environment dictionary, then waits
307 until execution time to see what type it is, then tries to
308 create an Action out of it."""
309 def __init__(self, var):
310 self.var = SCons.Util.to_String(var)
312 def __call__(self, target, source, env, for_signature):
313 if env.has_key(self.var):
316 # The variable reference substitutes to nothing.
319 class FunctionAction(ActionBase):
320 """Class for Python function actions."""
322 def __init__(self, execfunction, strfunction=_null):
323 self.execfunction = execfunction
324 if strfunction is _null:
325 def strfunction(target, source, execfunction=execfunction):
327 return '"' + str(s) + '"'
329 name = execfunction.__name__
330 except AttributeError:
332 name = execfunction.__class__.__name__
333 except AttributeError:
334 name = "unknown_python_function"
336 tstr = quote(target[0])
338 tstr = str(map(lambda x, q=quote: q(x), target))
340 sstr = quote(source[0])
342 sstr = str(map(lambda x, q=quote: q(x), source))
343 return "%s(%s, %s)" % (name, tstr, sstr)
344 self.strfunction = strfunction
346 def __call__(self, target, source, env):
348 if not SCons.Util.is_List(target):
350 if not SCons.Util.is_List(source):
352 if print_actions and self.strfunction:
353 s = self.strfunction(target, source)
357 rsources = map(rfile, source)
358 r = self.execfunction(target=target, source=rsources, env=env)
361 def get_contents(self, target, source, env):
362 """Return the signature contents of this callable action.
364 By providing direct access to the code object of the
365 function, Python makes this extremely easy. Hooray!
367 #XXX DOES NOT ACCOUNT FOR CHANGES IN ENVIRONMENT VARIABLES
368 #THE FUNCTION MAY USE
370 # "self.execfunction" is a function.
371 code = self.execfunction.func_code.co_code
373 # "self.execfunction" is a callable object.
374 code = self.execfunction.__call__.im_func.func_code.co_code
377 class ListAction(ActionBase):
378 """Class for lists of other actions."""
379 def __init__(self, list):
380 self.list = map(lambda x: Action(x), list)
382 def get_actions(self):
385 def __call__(self, target, source, env):
387 r = l(target, source, env)
392 def get_contents(self, target, source, env):
393 """Return the signature contents of this action list.
395 Simple concatenation of the signatures of the elements.
397 return string.join(map(lambda x, t=target, s=source, e=env:
398 x.get_contents(t, s, e),