#
# Copyright (c) 2001, 2002, 2003, 2004 The SCons Foundation
#
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# "Software"), to deal in the Software without restriction, including
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# 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.
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Scanner/Prog.py 0.96.1.D001 2004/08/23 09:55:29 knight"

import string

import SCons.Node
import SCons.Node.FS
import SCons.Scanner
import SCons.Util

def ProgScan(fs = SCons.Node.FS.default_fs):
    """Return a prototype Scanner instance for scanning executable
    files for static-lib dependencies"""
    pf = SCons.Scanner.FindPathDirs('LIBPATH', fs)
    ps = SCons.Scanner.Base(scan, "ProgScan", path_function = pf)
    return ps

def scan(node, env, libpath = (), fs = SCons.Node.FS.default_fs):
    """
    This scanner scans program files for static-library
    dependencies.  It will search the LIBPATH environment variable
    for libraries specified in the LIBS variable, returning any
    files it finds as dependencies.
    """

    try:
        libs = env.Dictionary('LIBS')
    except KeyError:
        # There are no LIBS in this environment, so just return a null list:
        return []
    if SCons.Util.is_String(libs):
        libs = string.split(libs)
    elif not SCons.Util.is_List(libs):
        libs = [libs]

    try:
        prefix = env.Dictionary('LIBPREFIXES')
        if not SCons.Util.is_List(prefix):
            prefix = [ prefix ]
    except KeyError:
        prefix = [ '' ]

    try:
        suffix = env.Dictionary('LIBSUFFIXES')
        if not SCons.Util.is_List(suffix):
            suffix = [ suffix ]
    except KeyError:
        suffix = [ '' ]

    find_file = SCons.Node.FS.find_file
    adjustixes = SCons.Util.adjustixes
    result = []
    for suf in map(env.subst, suffix):
        for pref in map(env.subst, prefix):
            for lib in libs:
                if SCons.Util.is_String(lib):
                    lib = env.subst(lib)
                    lib = adjustixes(lib, pref, suf)
                    lib = find_file(lib, libpath, fs.File)
                    if lib:
                        result.append(lib)
                else:
                    result.append(lib)
    return result