"""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 sys

import SCons.Defaults
import SCons.Tool
import SCons.Util
from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
from SCons.Platform.win32 import CHOCO_DEFAULT_PATH

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

if sys.platform == 'win32':
    BINS = ['bison', 'yacc', 'win_bison']
else:
    BINS = ["bison", "yacc"]


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 get_yacc_path(env, append_paths=False):
    """
    Find the path to the yacc tool, searching several possible names

    Only called in the Windows case, so the default_path
    can be Windows-specific

    :param env: current construction environment
    :param append_paths: if set, add the path to the tool to PATH
    :return: path to yacc tool, if found
    """
    for prog in BINS:
        bin_path = SCons.Tool.find_program_path(
            env,
            prog,
            default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS)
        if bin_path:
            if append_paths:
                env.AppendENVPath('PATH', os.path.dirname(bin_path))
            return bin_path
    SCons.Warnings.SConsWarning('yacc tool requested, but yacc or bison binary not found in ENV PATH')


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)

    if sys.platform == 'win32':
        # ignore the return, all we need is for the path to be added
        _ = get_yacc_path(env, append_paths=True)

    if 'YACC' not in env:
        env["YACC"] = env.Detect(BINS)

    env['YACCFLAGS'] = SCons.Util.CLVar('')
    env['YACCCOM'] = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
    env['YACCHFILESUFFIX'] = '.h'
    env['YACCHXXFILESUFFIX'] = '.hpp'
    env['YACCVCGFILESUFFIX'] = '.vcg'


def exists(env):
    if 'YACC' in env:
        return env.Detect(env['YACC'])

    if sys.platform == 'win32':
        return get_yacc_path(env)
    else:
        return env.Detect(BINS)

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