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SCons / src / engine / SCons / Scanner / Prog.py

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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

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"""
    ps = SCons.Scanner.Base(scan, "ProgScan", fs, path_function = path)
    return ps

def path(env, dir, fs = SCons.Node.FS.default_fs):
    try:
        libpath = env['LIBPATH']
    except KeyError:
        return ()
    return tuple(fs.Rsearchall(SCons.Util.mapPaths(libpath, dir, env),
                               clazz = SCons.Node.FS.Dir,
                               must_exist = 0))

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)

    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 = [ '' ]

    ret = []
    for suf in map(env.subst, suffix):
        for pref in map(env.subst, prefix):
            ret.extend(map(lambda x, s=suf, p=pref: p + x + s, libs))
    return SCons.Node.FS.find_files(ret, libpath, fs.File)