from mode import Fundamental
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule
from mode.python import StringGrammar1, StringGrammar2, StringGrammar3, StringGrammar4

class CommentGrammar(Grammar):
    rules = [PatternRule('data', r'(?:[^\*]|\*(?!\)))+')]
class SequenceGrammar(Grammar):
    rules = [PatternRule('data', r'(?:\\.|[^?])+')]

class EbnfGrammar(Grammar):
    rules = [
        PatternRule('spaces', ' +'),
        PatternRule('eol', r'\n'),
        RegionRule('string', "'", StringGrammar1, "'"),
        RegionRule('string', '"', StringGrammar2, '"'),
        RegionRule('ebnf_sequence', r'\?', SequenceGrammar, r'\?'),
        RegionRule('comment', r'\(\*', CommentGrammar, r'\*\)'),
        PatternRule('delimiter', '[=,;|\[\]{}\(\)-]'),
        PatternRule('ebnf_nonterminal', r'[a-zA-Z_][-a-zA-Z0-9_ ]*[a-zA-Z0-9_]'),
        PatternRule('ebnf_nonterminal', r'[a-zA-Z_]'),
    ]

class Ebnf(Fundamental):
    name       = 'ebnf'
    extensions = ['.ebnf']
    grammar    = EbnfGrammar
    colors     = {
        'ebnf_sequence.start': ('magenta', 'default', 'bold'),
        'ebnf_sequence.data':  ('magenta', 'default', 'bold'),
        'ebnf_sequence.null':  ('magenta', 'default', 'bold'),
        'ebnf_sequence.end':   ('magenta', 'default', 'bold'),
        'ebnf_nonterminal':    ('cyan', 'default', 'bold'),
    }

install = Ebnf.install