pmacs3/mode/haskell.py

import commands, os.path, string, sys, traceback
import color, completer, default, mode, method, regex, tab
from point import Point
from lex import Grammar, PatternRule, RegionRule, OverridePatternRule, NocasePatternRule

class CommentGrammar(Grammar): pass
CommentGrammar.rules = [
    RegionRule(r'comment', r'{-', CommentGrammar, r'-}'),
    PatternRule(r'data', r'(?:[^{-]|{(?!-)|-(?!}))+'),
]

class StringGrammar(Grammar):
    rules = [
        RegionRule(r'gap', r'\\ *\n$', Grammar, r'^ *[^ \n]'),
        NocasePatternRule(r'escaped', r'\\(?:NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|[&abfnrtv\\"\']|\^[a-z]|\d{1,3}|o[0-7]{0,3}|x(?:[0-9a-f]){0,2})'),
        PatternRule(r'data', r'[^\\"]+'),
    ]

class HaskellGrammar(Grammar):
    rules = [
        PatternRule(r'comment', r'--(?!>).*$'),
        RegionRule(r'comment', r'{-', CommentGrammar, r'-}'),

        PatternRule(r'integer', r'[0-9]+|0[oO][0-7]+|0[xX][0-7]+'),
        PatternRule(r'float', r'[0-9]+\.[0-9]+(?:[eE][+-]?[0-9]+)?|[0-9]+[eE][+-]?[0-9]+'),
        PatternRule(r'char', r"'[^'\\]'"),
        PatternRule(r'char', r"'(?:[^'\\]|\\(?:NUL|SOH|STX|ETX|EOT|ENQ|ACK|BEL|BS|HT|LF|VT|FF|CR|SO|SI|DLE|DC1|DC2|DC3|DC4|NAK|SYN|ETB|CAN|EM|SUB|ESC|FS|GS|RS|US|SP|DEL|[&abfnrtv\\\"\']|\^[a-z]|\d{1,3}|o[0-7]{0,3}|x(?:[0-9a-f]){0,2}))'"),

        PatternRule(r'spaces', r' +'),
        PatternRule(r'eol', r'\n'),
        PatternRule(r'delimiter', r'[\[\](){};]'),

        RegionRule(r'string', r'"', StringGrammar, r'"'),
        PatternRule(r'reserved', r"(?:_|where|type|then|of|newtype|module|let|instance|infixr|infixl|infix|in|import|if|else|do|deriving|default|data|class|case)(?![a-zA-Z0-9_'])"),
        PatternRule(r'hs_declaration', r"^[a-z_][a-zA-Z0-9_']*"),
        PatternRule(r'hs_variable', r"[a-z_][a-zA-Z0-9_']*"),
        PatternRule(r'hs_constructor', r"[A-Z][a-zA-Z0-9_']*"),
        PatternRule(r'hs_operator', r'`[a-z_][a-zA-Z0-9_\']*`'),
        PatternRule(r'operator', r'@|!|>@>|>>=|>>|=>|::|->|;|<-|\\\\|\.\.|!!|:|\+\+|\||\.|\\|>=|>|/=|==|<=|<|\|\||&&|\^\^|\*\*|##|\^|/|\*|-|\+|='),
    ]

class HaskellTabber(tab.Tabber):
    pass

class Haskell(mode.Fundamental):
    modename     = 'Haskell'
    extensions   = ['.hs']
    tabwidth     = 4
    commentc     = '--'
    #tabbercls   = mode.lisp.LispTabber
    grammar      = HaskellGrammar
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '{': '}', '[': ']'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', '}': '{', ']': '['}
    colors       = {
        'hs_constructor':   ('magenta', 'default', 'bold'),
        'hs_declaration':   ('blue', 'default', 'bold'),
        'hs_variable':      ('yellow', 'default', 'bold'),
        'hs_operator':      ('cyan', 'default', 'bold'),
        'string.gap.start': ('red', 'default', 'bold'),
        'string.gap.null':  ('red', 'default', 'bold'),
        'string.gap.end':   ('red', 'default', 'bold'),
    }
    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 = Haskell.install