pmacs3/mode/javascript.py

import color, mode, tab
from lex import Grammar, PatternRule, RegionRule
from point import Point
from mode.python import StringGrammar

class JavascriptGrammar(Grammar):
    rules = [
        PatternRule(r'comment', r'//.*$'),
        RegionRule(r'comment', '/\*', Grammar, '\*/'),
        PatternRule(r'continuation', r'\\(?= *$)'),
        PatternRule(r'js_function', r"(?<=function )[a-zA-Z_][a-zA-Z0-9_]*"),
        PatternRule(r'js_class', r"(?<=class )[a-zA-Z_][a-zA-Z0-9_]*"),
        
        PatternRule(r'js_reserved', 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(r'js_reserved', r'(?:abstract|debugger|enum|goto|implements|interface|native|protected|synchronized|throws|transient|volatile)(?![a-zA-Z0-9_])'),
        PatternRule(r'js_nonreserved', r'(?:get|include|set)(?![a-zA-Z0-9_])'),

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

        PatternRule(r'integer', r"(?:0|[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),
        PatternRule(r'float', 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(r'delimiter', r'%=|&&=|&=|\(|\)|\*=|\+=|,|-=|\.{3}|\.|/=(?= |$)|::|:|;|<<=|>>=|>>>=|\?|\[|\]|^=|^^=|\{|\}|\|=|\|\|='),
        PatternRule(r'operator', r'!==|!=|!|%|&&|&|\*|\+\+|\+|--|-|/(?= |$)|<<=|<<|<=|<|===|==|=|>>>=|>>>|>>=|>>|>=|>|\\'),

        RegionRule('js_regex', "/", StringGrammar, "/"),
        RegionRule('string', "'", StringGrammar, "'"),
        RegionRule('string', '"', StringGrammar, '"'),
    ]

class JavascriptTabber(tab.StackTabber):
    def is_base(self, y):
        if y == 0:
            return True
        highlighter = self.mode.window.buffer.highlights[self.mode.name()]
        if not highlighter.tokens[y]:
            return False
        t = highlighter.tokens[y][0]
        return t.name == 'reserved' and t.string == 'function'
    def _handle_other_token(self, currlvl, y, i):
        token  = self.get_token(y, i)
        fqname = token.fqname()
        if token.name == 'operator' and token.string == '=':
            self._opt_append("cont", currlvl + 4)
        elif token.name == 'delimiter' and token.string == ";":
            self._opt_pop("cont")
        return currlvl

class Javascript(mode.Fundamental):
    modename    = 'Javascript'
    extensions  = ['.js']
    grammar     = JavascriptGrammar
    tabbercls   = JavascriptTabber
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    colors      = {
        'js_function':      ('blue', 'default'),
        'js_class':         ('green', 'default'),
        'js_reserved':      ('cyan', 'default'),
        'js_nonreserved':   ('cyan', 'default'),
        'js_regex.start':   ('cyan', 'default'),
        'js_regex.null':    ('cyan', 'default'),
        'js_regex.octal':   ('magenta', 'default'),
        'js_regex.escaped': ('magenta', 'default'),
        'js_regex.end':     ('cyan', 'default'),
    }
    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.add_bindings('close-paren', (')',))
        self.add_bindings('close-brace', ('}',))
        self.add_bindings('close-bracket', (']',))

install = Javascript.install