pmacs3/mode/haskell.py

import os.path
from method.shell import Interact
from mode import Fundamental
from lex import Grammar, PatternRule, RegionRule, OverridePatternRule, NocasePatternRule
from tab import Tabber

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 HugsStart(Interact):
    args = []
    reuse = True
    def _execute(self, w, **vargs):
        Interact._execute(self, w, bname='*Hugs*', cmd='hugs')
class HugsLoadFile(Interact):
    args = []
    reuse = True
    def _execute(self, w, **vargs):
        Interact._execute(self, w, bname='*Hugs*', cmd='hugs')
        b = w.application.get_buffer_by_name('*Hugs*')
        path = os.path.realpath(w.buffer.path)
        b.pipe_write(':load "%s"\n' % path)

class HaskellTabber(Tabber):
    pass

class Haskell(Fundamental):
    name        = 'Haskell'
    extensions  = ['.hs']
    tabwidth    = 4
    commentc    = '--'
    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'),
    }
    _bindings = {
        'close-paren':   (')',),
        'close-brace':   ('}',),
        'close-bracket': (']',),
    }
    actions  = [HugsStart, HugsLoadFile]

install = Haskell.install