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"""SCons.Builder
XXX
"""
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import os
import SCons.Node.FS
import SCons.Util
import string
import types
class Builder:
"""Base class for Builders, objects that create output
nodes (files) from input nodes (files).
"""
def __init__(self, name = None,
action = None,
input_suffix = None,
output_suffix = None,
node_factory = SCons.Node.FS.default_fs.File):
self.name = name
self.action = Action(action)
self.insuffix = input_suffix
self.outsuffix = output_suffix
self.node_factory = node_factory
if not self.insuffix is None and self.insuffix[0] != '.':
self.insuffix = '.' + self.insuffix
if not self.outsuffix is None and self.outsuffix[0] != '.':
self.outsuffix = '.' + self.outsuffix
def __cmp__(self, other):
return cmp(self.__dict__, other.__dict__)
def __call__(self, env, target = None, source = None):
tlist = SCons.Util.scons_str2nodes(target)
slist = SCons.Util.scons_str2nodes(source)
for t in tlist:
t.builder_set(self)
t.env_set(env)
t.derived = 1
t.add_source(slist)
if len(tlist) == 1:
tlist = tlist[0]
return tlist
def execute(self, **kw):
"""Execute a builder's action to create an output object.
"""
return apply(self.action.execute, (), kw)
print_actions = 1;
execute_actions = 1;
def Action(act):
"""A factory for action objects."""
if type(act) == types.StringType:
l = string.split(act, "\n")
if len(l) > 1:
act = l
if type(act) == types.FunctionType:
return FunctionAction(act)
elif type(act) == types.StringType:
return CommandAction(act)
elif type(act) == types.ListType:
return ListAction(act)
else:
return None
class ActionBase:
"""Base class for actions that create output objects.
We currently expect Actions will only be accessible through
Builder objects, so they don't yet merit their own module."""
def __cmp__(self, other):
return cmp(self.__dict__, other.__dict__)
def show(self, string):
print string
class CommandAction(ActionBase):
"""Class for command-execution actions."""
def __init__(self, string):
self.command = string
def execute(self, **kw):
cmd = self.command % kw
if print_actions:
self.show(cmd)
ret = 0
if execute_actions:
pid = os.fork()
if not pid:
# Child process.
args = string.split(cmd)
try:
ENV = kw['ENV']
except:
import SCons.Defaults
ENV = SCons.Defaults.ENV
os.execvpe(args[0], args, ENV)
else:
# Parent process.
pid, stat = os.waitpid(pid, 0)
ret = stat >> 8
return ret
class FunctionAction(ActionBase):
"""Class for Python function actions."""
def __init__(self, function):
self.function = function
def execute(self, **kw):
# if print_actions:
# XXX: WHAT SHOULD WE PRINT HERE?
if execute_actions:
return self.function(kw)
class ListAction(ActionBase):
"""Class for lists of other actions."""
def __init__(self, list):
self.list = map(lambda x: Action(x), list)
def execute(self, **kw):
for l in self.list:
r = apply(l.execute, (), kw)
if r != 0:
return r
return 0
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