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"""SCons.Environment
XXX
"""
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import copy
import re
import types
import SCons.Util
def Command():
pass # XXX
def Install():
pass # XXX
def InstallAs():
pass # XXX
_cv = re.compile(r'%([_a-zA-Z]\w*|{[_a-zA-Z]\w*})')
def _deepcopy_atomic(x, memo):
return x
copy._deepcopy_dispatch[types.ModuleType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.ClassType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.FunctionType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.MethodType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.TracebackType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.FrameType] = _deepcopy_atomic
copy._deepcopy_dispatch[types.FileType] = _deepcopy_atomic
class Environment:
"""Base class for construction Environments. These are
the primary objects used to communicate dependency and
construction information to the build engine.
Keyword arguments supplied when the construction Environment
is created are construction variables used to initialize the
Environment.
"""
def __init__(self, **kw):
self.Dictionary = {}
if kw.has_key('BUILDERS'):
builders = kw['BUILDERS']
if not type(builders) is types.ListType:
kw['BUILDERS'] = [builders]
else:
import SCons.Defaults
kw['BUILDERS'] = SCons.Defaults.Builders[:]
self.Dictionary.update(copy.deepcopy(kw))
class BuilderWrapper:
"""Wrapper class that allows an environment to
be associated with a Builder at instantiation.
"""
def __init__(self, env, builder):
self.env = env
self.builder = builder
def __call__(self, target = None, source = None):
return self.builder(self.env, target, source)
def execute(self, **kw):
apply(self.builder.execute, (), kw)
for b in kw['BUILDERS']:
setattr(self, b.name, BuilderWrapper(self, b))
def __cmp__(self, other):
return cmp(self.Dictionary, other.Dictionary)
def Builders(self):
pass # XXX
def Copy(self, **kw):
"""Return a copy of a construction Environment. The
copy is like a Python "deep copy"--that is, independent
copies are made recursively of each objects--except that
a reference is copied when an object is not deep-copyable
(like a function). There are no references to any mutable
objects in the original Environment.
"""
clone = copy.deepcopy(self)
apply(clone.Update, (), kw)
return clone
def Scanners(self):
pass # XXX
def Update(self, **kw):
"""Update an existing construction Environment with new
construction variables and/or values.
"""
self.Dictionary.update(copy.deepcopy(kw))
def Depends(self, target, dependency):
"""Explicity specify that 'target's depend on 'dependency'."""
tlist = SCons.Util.scons_str2nodes(target)
dlist = SCons.Util.scons_str2nodes(dependency)
for t in tlist:
t.add_dependency(dlist)
if len(tlist) == 1:
tlist = tlist[0]
return tlist
def subst(self, string):
"""Recursively interpolates construction variables from the
Environment into the specified string, returning the expanded
result. Construction variables are specified by a % prefix
in the string and begin with an initial underscore or
alphabetic character followed by any number of underscores
or alphanumeric characters. The construction variable names
may be surrounded by curly braces to separate the name from
trailing characters.
"""
def repl(m, _self=self):
key = m.group(1)
if key[:1] == '{' and key[-1:] == '}':
key = key[1:-1]
if _self.Dictionary.has_key(key): return _self.Dictionary[key]
else: return ''
n = 1
while n != 0:
string, n = _cv.subn(repl, string)
return string
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