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"""engine.SCons.SConscript
This module defines the Python API provided to SConscript and SConstruct
files.
"""
#
# Copyright (c) 2001, 2002 Steven Knight
#
# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import SCons.Builder
import SCons.Defaults
import SCons.Environment
import SCons.Errors
import SCons.Node
import SCons.Node.FS
import SCons.Util
import os
import os.path
import string
import sys
default_targets = []
print_help = 0
arguments = {}
# global exports set by Export():
global_exports = {}
# chdir flag
sconscript_chdir = 0
def SConscriptChdir(flag):
global sconscript_chdir
sconscript_chdir = flag
def _scons_add_args(alist):
global arguments
for arg in alist:
a, b = string.split(arg, '=', 2)
arguments[a] = b
class Frame:
"""A frame on the SConstruct/SConscript call stack"""
def __init__(self, exports):
self.globals = BuildDefaultGlobals()
self.retval = None
self.prev_dir = SCons.Node.FS.default_fs.getcwd()
self.exports = {} # exports from the calling SConscript
try:
if SCons.Util.is_List(exports):
for export in exports:
self.exports[export] = stack[-1].globals[export]
else:
for export in string.split(exports):
self.exports[export] = stack[-1].globals[export]
except KeyError, x:
raise SCons.Errors.UserError, "Export of non-existant variable '%s'"%x
# the SConstruct/SConscript call stack:
stack = []
# For documentation on the methods in this file, see the scons man-page
def Return(*vars):
retval = []
try:
for var in vars:
for v in string.split(var):
retval.append(stack[-1].globals[v])
except KeyError, x:
raise SCons.Errors.UserError, "Return of non-existant variable '%s'"%x
if len(retval) == 1:
stack[-1].retval = retval[0]
else:
stack[-1].retval = tuple(retval)
# This function is responsible for converting the parameters passed to
# SConscript() calls into a list of files and export variables. If
# the parameters are invalid, throws SCons.Errors.UserError. Returns a
# tuple (l, e) where l is a list of filenames and e is a list of
# exports.
def GetSConscriptFilenames(ls, kw):
files = []
exports = []
if len(ls) == 0:
try:
dirs = map(str, SCons.Util.argmunge(kw["dirs"]))
except KeyError:
raise SCons.Errors.UserError, \
"Invalid SConscript usage - no parameters"
name = kw.get('name', 'SConscript')
if kw.get('exports'):
exports = SCons.Util.argmunge(kw['exports'])
files = map(lambda n, name = name: os.path.join(n, name), dirs)
elif len(ls) == 1:
files = SCons.Util.argmunge(ls[0])
if kw.get('exports'):
exports = SCons.Util.argmunge(kw['exports'])
elif len(ls) == 2:
files = SCons.Util.argmunge(ls[0])
exports = SCons.Util.argmunge(ls[1])
if kw.get('exports'):
exports.extend(SCons.Util.argmunge(kw.get('exports')))
else:
raise SCons.Errors.UserError, \
"Invalid SConscript() usage - too many arguments"
return (files, exports)
def SConscript(*ls, **kw):
files, exports = GetSConscriptFilenames(ls, kw)
# evaluate each SConscript file
results = []
for fn in files:
stack.append(Frame(exports))
old_dir = None
old_sys_path = sys.path
try:
if fn == "-":
exec sys.stdin in stack[-1].globals
else:
if isinstance(fn, SCons.Node.Node):
f = fn
else:
f = SCons.Node.FS.default_fs.File(str(fn))
if f.exists():
file = open(str(f), "r")
SCons.Node.FS.default_fs.chdir(f.dir)
if sconscript_chdir:
old_dir = os.getcwd()
os.chdir(str(f.dir))
# prepend the SConscript directory to sys.path so
# that Python modules in the SConscript directory can
# be easily imported
sys.path = [os.path.abspath(str(f.dir))] + sys.path
exec file in stack[-1].globals
else:
sys.stderr.write("Ignoring missing SConscript '%s'\n" %
f.path)
finally:
sys.path = old_sys_path
frame = stack.pop()
SCons.Node.FS.default_fs.chdir(frame.prev_dir)
if old_dir:
os.chdir(old_dir)
results.append(frame.retval)
# if we only have one script, don't return a tuple
if len(results) == 1:
return results[0]
else:
return tuple(results)
def Default(*targets):
for t in targets:
if isinstance(t, SCons.Node.Node):
default_targets.append(t)
else:
default_targets.extend(SCons.Node.arg2nodes(t,
SCons.Node.FS.default_fs.Entry))
def Help(text):
if print_help:
print text
print "Use scons -H for help about command-line options."
sys.exit(0)
def BuildDir(build_dir, src_dir, duplicate=1):
SCons.Node.FS.default_fs.BuildDir(build_dir, src_dir, duplicate)
def GetBuildPath(files):
nodes = SCons.Node.arg2nodes(files, SCons.Node.FS.default_fs.Entry)
ret = map(str, nodes)
if len(ret) == 1:
return ret[0]
return ret
def Export(*vars):
try:
for var in vars:
for v in string.split(var):
global_exports[v] = stack[-1].globals[v]
except KeyError, x:
raise SCons.Errors.UserError, "Export of non-existant variable '%s'"%x
def Import(*vars):
try:
for var in vars:
for v in string.split(var):
if stack[-1].exports.has_key(v):
stack[-1].globals[v] = stack[-1].exports[v]
else:
stack[-1].globals[v] = global_exports[v]
except KeyError,x:
raise SCons.Errors.UserError, "Import of non-existant variable '%s'"%x
def BuildDefaultGlobals():
"""
Create a dictionary containing all the default globals for
SConscruct and SConscript files.
"""
globals = {}
globals['Action'] = SCons.Action.Action
globals['ARGUMENTS'] = arguments
globals['BuildDir'] = BuildDir
globals['Builder'] = SCons.Builder.Builder
globals['CScan'] = SCons.Defaults.CScan
globals['Default'] = Default
globals['Dir'] = SCons.Node.FS.default_fs.Dir
globals['Environment'] = SCons.Environment.Environment
globals['Export'] = Export
globals['File'] = SCons.Node.FS.default_fs.File
globals['GetBuildPath'] = GetBuildPath
globals['GetCommandHandler'] = SCons.Action.GetCommandHandler
globals['Help'] = Help
globals['Import'] = Import
globals['Library'] = SCons.Defaults.Library
globals['Object'] = SCons.Defaults.Object
globals['Program'] = SCons.Defaults.Program
globals['Return'] = Return
globals['Scanner'] = SCons.Scanner.Base
globals['SConscript'] = SConscript
globals['SConscriptChdir'] = SConscriptChdir
globals['SetCommandHandler'] = SCons.Action.SetCommandHandler
globals['Split'] = SCons.Util.Split
globals['WhereIs'] = SCons.Util.WhereIs
return globals
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