import color, mode
from lex import Grammar, PatternRule, NocasePatternRule, RegionRule, NocaseRegionRule
from point import Point

class StringGrammar1(Grammar):
    rules = [
        PatternRule(r'octal', r'\\[0-7]{3}'),
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'data', r"[^']+"),
    ]
class StringGrammar2(Grammar):
    rules = [
        PatternRule(r'octal', r'\\[0-7]{3}'),
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'data', r'[^"]+'),
    ]

class CommentGrammar1(Grammar):
    rules = [PatternRule(r'data', r'(?:[^*]|\*(?!/))+')]
class CommentGrammar2(Grammar):
    rules = [PatternRule(r'data', r'(?:[^-]|-(?!-)|--(?!>))+')]

class KeywordGrammar(Grammar):
    rules = [
        PatternRule(r'octal', r'\\[0-7]{3}'),
        PatternRule(r'escaped', r'\\.'),
        RegionRule(r'string', "'", StringGrammar1, r"'"),
        RegionRule(r'string', '"', StringGrammar2, r'"'),
    ]

class CSSGrammar(Grammar):
    rules = [
        RegionRule(r'comment', '/\*', CommentGrammar1, '\*/'),
        RegionRule(r'comment', '<!--', CommentGrammar2, '-->'),
        NocasePatternRule(r'css_dimension', r'[+-]?(?:[0-9]+|[0-9]*\.[0-9]+)[-a-z_][-a-z0-9_]*'),
        NocasePatternRule(r'css_percentage', r'[+-]?(?:[0-9]+|[0-9]*\.[0-9]+)%%'),
        NocasePatternRule(r'css_length', r'[+-]?(?:[0-9]+|[0-9]*\.[0-9]+)(?:em|ex|px|in|cm|mm|pt|pc)'),
        NocasePatternRule(r'css_hash', r'#[-a-z0-9_]+'),
        NocasePatternRule(r'css_real', r'[+-]?[0-9]*\.[0-9]+'),
        NocasePatternRule(r'css_int', r'[+-]?[0-9]+'),
        NocasePatternRule(r'css_rule', r'@(?:page|media|import)'),
        NocasePatternRule(r'css_color', r'(?:aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|orange|purple|red|silver|teal|white|yellow|#[0-9]{6}|#[0-9]{3})'),

        NocasePatternRule(r'css_keyword', r'(?:url|rgb|counter)'),
        NocaseRegionRule(r'css_keyword', '(?:(?<=url)|(?<=rgb)|(?<=counter))\(', KeywordGrammar, '\)'),

        NocasePatternRule(r'css_label', r"\.?[-a-zA-Z0-9_]+(?= *{)"),
        NocasePatternRule(r'css_ident', r"-?[a-z_][-a-z0-9_]*"),
        NocasePatternRule(r'css_name', r"[-a-z0-9_]+"),
        NocasePatternRule(r'delimiter', r'[:;,{}()\[\]]|~=|\|=|='),
        RegionRule(r'string', "'", StringGrammar1, r"'"),
        RegionRule(r'string', '"', StringGrammar2, r'"'),
    ]

class CSS(mode.Fundamental):
    modename   = 'CSS'
    extensions = ['.css']
    grammar    = CSSGrammar
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    colors     = {
        'css_dimension':       ('magenta', 'default', 'bold'),
        'css_percentage':      ('magenta', 'default', 'bold'),
        'css_length':          ('magenta', 'default', 'bold'),
        'css_real':            ('magenta', 'default', 'bold'),
        'css_int':             ('magenta', 'default', 'bold'),
        'css_color':           ('magenta', 'default', 'bold'),
        'css_hash':            ('cyan', 'default', 'bold'),
        'css_rule':            ('cyan', 'default', 'bold'),
        'css_label':           ('cyan', 'default', 'bold'),
        'css_keyword':         ('cyan', 'default', 'bold'),
        'css_ident':           ('default', 'default', 'bold'),
        'css_name':            ('default', 'default', 'bold'),
        'css_keyword':         ('cyan', 'default', 'bold'),
        'css_keyword.start':   ('default', 'default', 'bold'),
        'css_keyword.null':    ('cyan', 'default', 'bold'),
        'css_keyword.octal':   ('magenta', 'default', 'bold'),
        'css_keyword.escaped': ('magenta', 'default', 'bold'),
        'css_keyword.end':     ('default', 'default', 'bold'),
    }
    _bindings = {
        'close-paren': (')',),
        'close-brace': ('}',),
        'close-bracket': (']',),
    }

install = CSS.install