"""SCons.Tool.yacc

Tool-specific initialization for yacc.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

"""

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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import os.path

import SCons.Defaults
import SCons.Tool
import SCons.Util

YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")

def _yaccEmitter(target, source, env, ysuf, hsuf):
    yaccflags = env.subst("$YACCFLAGS", target=target, source=source)
    flags = SCons.Util.CLVar(yaccflags)
    targetBase, targetExt = os.path.splitext(SCons.Util.to_String(target[0]))

    if '.ym' in ysuf:                # If using Objective-C
        target = [targetBase + ".m"] # the extension is ".m".


    # If -d is specified on the command line, yacc will emit a .h
    # or .hpp file with the same name as the .c or .cpp output file.
    if '-d' in flags:
        target.append(targetBase + env.subst(hsuf, target=target, source=source))

    # If -g is specified on the command line, yacc will emit a .vcg
    # file with the same base name as the .y, .yacc, .ym or .yy file.
    if "-g" in flags:
        base, ext = os.path.splitext(SCons.Util.to_String(source[0]))
        target.append(base + env.subst("$YACCVCGFILESUFFIX"))

    # If -v is specified yacc will create the output debug file
    # which is not really source for any process, but should
    # be noted and also be cleaned
    # Bug #2558
    if "-v" in flags:
        env.SideEffect(targetBase+'.output',target[0])
        env.Clean(target[0],targetBase+'.output')



    # With --defines and --graph, the name of the file is totally defined
    # in the options.
    fileGenOptions = ["--defines=", "--graph="]
    for option in flags:
        for fileGenOption in fileGenOptions:
            l = len(fileGenOption)
            if option[:l] == fileGenOption:
                # A file generating option is present, so add the file
                # name to the list of targets.
                fileName = option[l:].strip()
                target.append(fileName)

    return (target, source)

def yEmitter(target, source, env):
    return _yaccEmitter(target, source, env, ['.y', '.yacc'], '$YACCHFILESUFFIX')

def ymEmitter(target, source, env):
    return _yaccEmitter(target, source, env, ['.ym'], '$YACCHFILESUFFIX')

def yyEmitter(target, source, env):
    return _yaccEmitter(target, source, env, ['.yy'], '$YACCHXXFILESUFFIX')

def generate(env):
    """Add Builders and construction variables for yacc to an Environment."""
    c_file, cxx_file = SCons.Tool.createCFileBuilders(env)

    # C
    c_file.add_action('.y', YaccAction)
    c_file.add_emitter('.y', yEmitter)

    c_file.add_action('.yacc', YaccAction)
    c_file.add_emitter('.yacc', yEmitter)

    # Objective-C
    c_file.add_action('.ym', YaccAction)
    c_file.add_emitter('.ym', ymEmitter)

    # C++
    cxx_file.add_action('.yy', YaccAction)
    cxx_file.add_emitter('.yy', yyEmitter)

    env['YACC']      = env.Detect('bison') or 'yacc'
    env['YACCFLAGS'] = SCons.Util.CLVar('')
    env['YACCCOM']   = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
    env['YACCHFILESUFFIX'] = '.h'

    env['YACCHXXFILESUFFIX'] = '.hpp'

    env['YACCVCGFILESUFFIX'] = '.vcg'

def exists(env):
    return env.Detect(['bison', 'yacc'])

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