"""SCons.Tool

SCons tool selection.

This looks for modules that define a callable object that can modify
a construction environment as appropriate for a given tool (or tool
chain).

Note that because this subsystem just *selects* a callable that can
modify a construction environment, it's possible for people to define
their own "tool specification" in an arbitrary callable function.  No
one needs to use or tie in to this subsystem in order to roll their own
tool definition.
"""

#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
#
# 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__ = "src/engine/SCons/Tool/__init__.py 4043 2009/02/23 09:06:45 scons"

import imp
import sys

import SCons.Builder
import SCons.Errors
import SCons.Node.FS
import SCons.Scanner
import SCons.Scanner.C
import SCons.Scanner.D
import SCons.Scanner.LaTeX
import SCons.Scanner.Prog

DefaultToolpath=[]

CScanner = SCons.Scanner.C.CScanner()
DScanner = SCons.Scanner.D.DScanner()
LaTeXScanner = SCons.Scanner.LaTeX.LaTeXScanner()
PDFLaTeXScanner = SCons.Scanner.LaTeX.PDFLaTeXScanner()
ProgramScanner = SCons.Scanner.Prog.ProgramScanner()
SourceFileScanner = SCons.Scanner.Base({}, name='SourceFileScanner')

CSuffixes = [".c", ".C", ".cxx", ".cpp", ".c++", ".cc",
             ".h", ".H", ".hxx", ".hpp", ".hh",
             ".F", ".fpp", ".FPP",
             ".m", ".mm",
             ".S", ".spp", ".SPP"]

DSuffixes = ['.d']

IDLSuffixes = [".idl", ".IDL"]

LaTeXSuffixes = [".tex", ".ltx", ".latex"]

for suffix in CSuffixes:
    SourceFileScanner.add_scanner(suffix, CScanner)

for suffix in DSuffixes:
    SourceFileScanner.add_scanner(suffix, DScanner)

# FIXME: what should be done here? Two scanners scan the same extensions,
# but look for different files, e.g., "picture.eps" vs. "picture.pdf".
# The builders for DVI and PDF explicitly reference their scanners
# I think that means this is not needed???
for suffix in LaTeXSuffixes:
    SourceFileScanner.add_scanner(suffix, LaTeXScanner)
    SourceFileScanner.add_scanner(suffix, PDFLaTeXScanner)

class Tool:
    def __init__(self, name, toolpath=[], **kw):
        self.name = name
        self.toolpath = toolpath + DefaultToolpath
        # remember these so we can merge them into the call
        self.init_kw = kw

        module = self._tool_module()
        self.generate = module.generate
        self.exists = module.exists
        if hasattr(module, 'options'):
            self.options = module.options

    def _tool_module(self):
        # TODO: Interchange zipimport with normal initilization for better error reporting
        oldpythonpath = sys.path
        sys.path = self.toolpath + sys.path

        try:
            try:
                file, path, desc = imp.find_module(self.name, self.toolpath)
                try:
                    return imp.load_module(self.name, file, path, desc)
                finally:
                    if file:
                        file.close()
            except ImportError, e:
                if str(e)!="No module named %s"%self.name:
                    raise SCons.Errors.EnvironmentError, e
                try:
                    import zipimport
                except ImportError:
                    pass
                else:
                    for aPath in self.toolpath:
                        try:
                            importer = zipimport.zipimporter(aPath)
                            return importer.load_module(self.name)
                        except ImportError, e:
                            pass
        finally:
            sys.path = oldpythonpath

        full_name = 'SCons.Tool.' + self.name
        try:
            return sys.modules[full_name]
        except KeyError:
            try:
                smpath = sys.modules['SCons.Tool'].__path__
                try:
                    file, path, desc = imp.find_module(self.name, smpath)
                    module = imp.load_module(full_name, file, path, desc)
                    setattr(SCons.Tool, self.name, module)
                    if file:
                        file.close()
                    return module
                except ImportError, e:
                    if str(e)!="No module named %s"%self.name:
                        raise SCons.Errors.EnvironmentError, e
                    try:
                        import zipimport
                        importer = zipimport.zipimporter( sys.modules['SCons.Tool'].__path__[0] )