# This file is part of python-ly, https://pypi.python.org/pypi/python-ly
#
# Copyright (c) 2008 - 2015 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# See http://www.gnu.org/licenses/ for more information.

"""
Parses and tokenizes Texinfo input, recognizing LilyPond in Texinfo.
"""

from __future__ import unicode_literals

from . import _token
from . import Parser, FallthroughParser


class Comment(_token.Comment):
    pass


class LineComment(Comment, _token.LineComment):
    rx = r"@c\b.*$"


class BlockCommentStart(Comment, _token.BlockCommentStart):
    rx = r"@ignore\b"
    def update_state(self, state):
        state.enter(ParseComment())
        
        
class BlockCommentEnd(Comment, _token.Leaver, _token.BlockCommentEnd):
    rx = r"@end\s+ignore\b"


class Attribute(_token.Token):
    pass


class Keyword(_token.Token):
    rx = r"@[a-zA-Z]+"


class Block(_token.Token):
    pass


class BlockStart(Block):
    rx = r"@[a-zA-Z]+\{"
    def update_state(self, state):
        state.enter(ParseBlock())


class BlockEnd(Block, _token.Leaver):
    rx = r"\}"


class EscapeChar(_token.Character):
    rx = r"@[@{}]"
    

class Accent(EscapeChar):
    rx = "@['\"',=^`~](\\{[a-zA-Z]\\}|[a-zA-Z]\\b)"


class Verbatim(_token.Token):
    pass


class VerbatimStart(Keyword):
    rx = r"@verbatim\b"
    def update_state(self, state):
        state.enter(ParseVerbatim())


class VerbatimEnd(Keyword, _token.Leaver):
    rx = r"@end\s+verbatim\b"
    
    
class LilyPondBlockStart(Block):
    rx = r"@lilypond(?=(\[[a-zA-Z,=0-9\\\s]+\])?\{)"
    def update_state(self, state):
        state.enter(ParseLilyPondBlockAttr())


class LilyPondBlockStartBrace(Block):
    rx = r"\{"
    def update_state(self, state):
        state.replace(ParseLilyPondBlock())


class LilyPondBlockEnd(Block, _token.Leaver):
    rx = r"\}"
    
    
class LilyPondEnvStart(Keyword):
    rx = r"@lilypond\b"
    def update_state(self, state):
        state.enter(ParseLilyPondEnvAttr())
    
    
class LilyPondEnvEnd(Keyword, _token.Leaver):
    rx = r"@end\s+lilypond\b"


class LilyPondFileStart(Block):
    rx = r"@lilypondfile\b"
    def update_state(self, state):
        state.enter(ParseLilyPondFile())


class LilyPondFileStartBrace(Block):
    rx = r"\{"
    def update_state(self, state):
        state.replace(ParseBlock())


class LilyPondAttrStart(Attribute):
    rx = r"\["
    def update_state(self, state):
        state.enter(ParseLilyPondAttr())
    
    
class LilyPondAttrEnd(Attribute, _token.Leaver):
    rx = r"\]"


# Parsers:

class ParseTexinfo(Parser):
    mode = "texinfo"
    items = (
        LineComment,
        BlockCommentStart,
        Accent,
        EscapeChar,
        LilyPondBlockStart,
        LilyPondEnvStart,
        LilyPondFileStart,
        BlockStart,
        VerbatimStart,
        Keyword,
    )


class ParseComment(Parser):
    default = Comment
    items = (
        BlockCommentEnd,
    )


class ParseBlock(Parser):
    items = (
        BlockEnd,
        Accent,
        EscapeChar,
        BlockStart,
        Keyword,
    )


class ParseVerbatim(Parser):
    default = Verbatim
    items = (
        VerbatimEnd,
    )


class ParseLilyPondBlockAttr(Parser):
    items = (
        LilyPondAttrStart,
        LilyPondBlockStartBrace,
    )


class ParseLilyPondEnvAttr(FallthroughParser):
    items = (
        LilyPondAttrStart,
    )
    def fallthrough(self, state):
        state.replace(ParseLilyPondEnv())


class ParseLilyPondAttr(Parser):
    default = Attribute
    items = (
        LilyPondAttrEnd,
    )


class ParseLilyPondFile(Parser):
    items = (
        LilyPondAttrStart,
        LilyPondFileStartBrace,
    )


from . import lilypond

class ParseLilyPondBlock(lilypond.ParseGlobal):
    items = (
        LilyPondBlockEnd,
    ) + lilypond.ParseGlobal.items


class ParseLilyPondEnv(lilypond.ParseGlobal):
    items = (
        LilyPondEnvEnd,
    ) + lilypond.ParseGlobal.items
    

