import os
import regex
from method import Method
from method.shell import Interact
from mode import Fundamental
from tab import StackTabber
from lex import Grammar, PatternRule, RegionRule
from mode.python import StringGrammar2

class LispGrammar(Grammar):
    rules = [
        PatternRule('comment', ';.*$'),
        PatternRule('delimiter', "[()']"),
        PatternRule('keyword', r'(?:or|not|list|let\*|let|lambda|if|cons|c[ad]+r|apply|and)(?![^\"\' \t()])'),
        PatternRule('lisp_word', r"[^\"' \t()]+"),
        RegionRule('string', '"', StringGrammar2, '"'),
        PatternRule('spaces', ' +'),
        PatternRule('eol', r'\n'),
    ]

class LispTabber(StackTabber):
    wsre = regex.whitespace
    wst  = ('spaces', 'null', 'eol',)
    sre  = regex.space
    st   = ('spaces', 'null',)
    def _handle_open_token(self, currlvl, y, i):
        token  = self.get_token(y, i)
        rtoken = self.get_next_right_token(y, i)
        if rtoken is None:
            level = self.get_curr_level() + self.mode.tabwidth
        elif rtoken.string not in ('(', 'define', 'lambda'):
            rtoken = self.get_next_right_token(y, i + 1)
            if rtoken is None or rtoken.string != '(':
                level = self.get_curr_level() + self.mode.tabwidth
            else:
                level = rtoken.x
        else:
            level = self.get_curr_level() + self.mode.tabwidth
        self._append(token.string, level)
        return currlvl

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

class Lisp(Fundamental):
    name        = 'Lisp'
    extensions  = ['.lisp']
    tabwidth    = 2
    tabbercls   = LispTabber
    grammar     = LispGrammar
    commentc    = ';'
    opentokens  = ('delimiter',)
    opentags    = {'(': ')'}
    closetokens = ('delimiter',)
    closetags   = {')': '('}
    actions     = [ClispStart, ClispLoadFile]
    _bindings   = {
        'close-paren': (')',),
    }
    commentc = ';'

install = Lisp.install