pmacs3/mode_javascript.py

import color, mode2
from lex2 import Grammar, PatternRule, RegionRule
from point2 import Point

class StringGrammar(Grammar):
    rules = [
        PatternRule(name=r'octal', pattern=r'\\[0-7]{3}'),
        PatternRule(name=r'escaped', pattern=r'\\.'),
    ]

class JavascriptGrammar(Grammar):
    rules = [
        PatternRule(name=r'comment', pattern=r'//.*$'),
        RegionRule(name=r'comment', start='/\*', grammar=Grammar(), end='\*/'),
        PatternRule(name=r'continuation', pattern=r'\\(?= *$)'),
        PatternRule(name=r'function', pattern=r"(?<=function )[a-zA-Z_][a-zA-Z0-9_]*"),
        PatternRule(name=r'class', pattern=r"(?<=class )[a-zA-Z_][a-zA-Z0-9_]*"),
        
        PatternRule(name=r'reserved1', pattern=r'(?:as|break|case|catch|class|const|continue|default|delete|do|else|export|extends|false|finally|for|function|if|import|in|instanceof|is|namespace|new|null|package|private|public|return|super|switch|this|throw|true|try|typeof|use|var|void|while|with)(?![a-zA-Z0-9_])'),
        PatternRule(name=r'reserved2', pattern=r'(?:abstract|debugger|enum|goto|implements|interface|native|protected|synchronized|throws|transient|volatile)(?![a-zA-Z0-9_])'),
        PatternRule(name=r'nonreserved', pattern=r'(?:get|include|set)(?![a-zA-Z0-9_])'),

        PatternRule(name=r"method", pattern=r"(?<=\.)[a-zA-Z_][a-zA-Z0-9_]*(?= *\()"),
        PatternRule(name=r'identifier', pattern=r"[a-zA-Z_][a-zA-Z0-9_]*"),

        PatternRule(name=r'integer', pattern=r"(?:0|[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),
        PatternRule(name=r'float', pattern=r"[0-9]+\.[0-9]*|\.[0-9]+|(?:[0-9]|[0-9]+\.[0-9]*|\.[0-9]+)[eE][\+-]?[0-9]+"),

        # fucking javascript!
        # their lexer grammar requires one-token look-behind in order to know
        # whether a "/" starts a literal regex, or is part of a mathematical
        # expression/assignment. so for now we will require either a space or $
        # after / in order to *not* treat it as a regex. dammit!
        PatternRule(name=r'delimiter', pattern=r'%=|&&=|&=|\(|\)|\*=|\+=|,|-=|\.{3}|\.|/=(?= |$)|::|:|;|<<=|>>=|>>>=|\?|\[|\]|^=|^^=|\{|\}|\|=|\|\|='),
        PatternRule(name=r'operator', pattern=r'!==|!=|!|%|&&|&|\*|\+\+|\+|--|-|/(?= |$)|<<=|<<|<=|<|===|==|=|>>>=|>>>|>>=|>>|>=|>|\\'),

        RegionRule(name='regex', start="/", grammar=StringGrammar(), end="/"),
        RegionRule(name='string', start="'", grammar=StringGrammar(), end="'"),
        RegionRule(name='string', start='"', grammar=StringGrammar(), end='"'),
    ]

class Javascript(mode2.Fundamental):
    grammar = JavascriptGrammar()
    def __init__(self, w):
        mode2.Fundamental.__init__(self, w)
        self.add_bindings('close-paren', (')',))
        self.add_bindings('close-brace', ('}',))
        self.add_bindings('close-bracket', (']',))
        self.colors = {
            'comment':       color.build('red', 'default'),
            'comment.start': color.build('red', 'default'),
            'comment.null':  color.build('red', 'default'),
            'comment.end':   color.build('red', 'default'),
            'continuation':  color.build('red', 'default'),
            'function':      color.build('blue', 'default'),
            'class':         color.build('green', 'default'),

            'reserved1':    color.build('cyan', 'default'),
            'reserved2':    color.build('cyan', 'default'),
            'nonreserved': color.build('cyan', 'default'),

            'delimiter': color.build('default', 'default'),
            'operator':  color.build('default', 'default'),
            'integer':   color.build('default', 'default'),
            'float':     color.build('default', 'default'),

            'string.start':   color.build('green', 'default'),
            'string.null':    color.build('green', 'default'),
            'string.octal':   color.build('magenta', 'default'),
            'string.escaped': color.build('magenta', 'default'),
            'string.end':     color.build('green', 'default'),

            'regex.start':   color.build('cyan', 'default'),
            'regex.null':    color.build('cyan', 'default'),
            'regex.octal':   color.build('magenta', 'default'),
            'regex.escaped': color.build('magenta', 'default'),
            'regex.end':     color.build('cyan', 'default'),
        }
    def name(self):
        return "Javascript"