import re

import commands
from tab import StackTabber
from mode import Fundamental
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule, OverridePatternRule
from method import Method
from method.shell import Interact

char  = '[a-zA-Z0-9_]'
word  = char + '+'
pname = '[.a-zA-Z0-9_]+'

class StringGrammar1(Grammar): pass
class StringGrammar2(Grammar): pass
class HereGrammar(Grammar): pass
class EvalGrammar(Grammar): pass
class NevalGrammar(Grammar): pass
class StanzaGrammar(Grammar): pass
class CaseGrammar(Grammar): pass
class TestGrammar(Grammar): pass
class ShGrammar(Grammar): pass

StringGrammar1.rules = [
    PatternRule(r'data', r'[^\']+'),
]

StringGrammar2.rules = [
    PatternRule(r'escaped', r'\\.'),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    PatternRule(r'variable', r"\$(?=\()"),
    PatternRule(r'data', r'[^\\$"]+'),
]

HereGrammar.rules = [
    PatternRule(r'escaped', r'\\.'),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    PatternRule(r'variable', r"\$(?=\()"),
    PatternRule(r'data', r'[^\\$]+'),
]        

EvalGrammar.rules = [
    RegionRule(r'string', "'", StringGrammar1, "'"),
    RegionRule(r'string', '"', StringGrammar2, '"'),
    PatternRule(r'escaped', r'\\.'),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    PatternRule(r'variable', r"\$(?=\()"),
    PatternRule(r'data', r'[^\\`$\'"]+'),
]

NevalGrammar.rules = [
    RegionRule(r'string', "'", Grammar, "'"),
    RegionRule(r'string', '"', StringGrammar2, '"'),
    PatternRule(r'escaped', r'\\.'),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    PatternRule(r'variable', r"\$(?=\()"),
    PatternRule(r'data', r'[^\\)$]+'),
]

StanzaGrammar.rules = [
    PatternRule(r'spaces', r' +'),
    PatternRule(r'start_cont', r'.+\\'),
    PatternRule(r'eol', r'\n'),
]

CaseGrammar.rules = [
    PatternRule(r'comment', r'#.*$'),
    PatternRule(r'spaces', r' +'),
    RegionRule(r'stanza', r'.+\\\n$', StanzaGrammar, r'.+\)', ShGrammar, r';;'),
    RegionRule(r'stanza', r'.+?\)', ShGrammar, r';;'),
    PatternRule(r'eol', r'\n'),
]

TestGrammar.rules = [
    PatternRule(r'spaces', r' +'),
    PatternRule(r'sh_builtin', r"(?<![-a-zA-Z0-9_=/])(?:source|alias|bg|bind|break|builtin|cd|command|compgen|complete|declare|dirs|disown|echo|enable|eval|exec|exit|export|fc|fg|getops|hash|help|history|jobs|kill|let|local|logout|popd|printf|pushd|pwd|readonly|read|return|set|shift|shopt|suspend|times|trap|type|ulimit|umask|unalias|unset|wait)(?![a-zA-Z0-9_=/])"),
    PatternRule(r'sh_reserved', r"(?:done|do|elif|else|esac|fi|for|function|if|in|select|then|until|while|time)(?![a-zA-Z0-9_=/])"),
    PatternRule(r'binop', r'==|=|!='),
    PatternRule(r'binop', r'-(?:nt|ot|ef|eq|ne|lt|gt|le|ge)(?!' + char + ')'),
    PatternRule(r'unop', r'-[a-zA-Z](?!' + char + ')'),
    PatternRule(r'continuation', r'\\\n$'),
    PatternRule(r'redirect', r'<|>'),
    PatternRule(r'delimiter', r";;|[();{}|&><]"),
    RegionRule(r'test', r'(?<![^ \t])test(?![a-zA-Z0-9_=/])', None, r';|\n'),
    RegionRule(r'test2', r'\[\[', None, r'\]\]'),
    RegionRule(r'test3', r'\[', None, r'\]'),
    RegionRule(r'eval', r'`', EvalGrammar, r'`'),
    RegionRule(r'neval', r'\$\(', NevalGrammar, r'\)'),
    PatternRule(r'variable', r"(?:^|(?<= ))" + word + "(?==)"),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    PatternRule(r'variable', r"\$(?=\()"),
    RegionRule(r'string', "'", StringGrammar1, "'"),
    RegionRule(r'string', '"', StringGrammar2, '"'),
    PatternRule(r'sh_bareword', r'[-a-zA-Z0-9_.]+'),
]

ShGrammar.rules = [
    PatternMatchRule('x', '( *)(' + word + ')(=)',
                     'spaces', 'variable', 'delimiter'),
    PatternMatchRule('x', '(alias|export)( +)(' + word + ')(=)',
                     'sh_builtin', 'spaces', 'variable', 'delimiter'),
    PatternMatchRule('x', '(unset)( +)(' + word + ')',
                     'sh_builtin', 'spaces', 'variable'),

    PatternRule(r'spaces', r' +'),
    RegionRule(r'heredoc', r"<<[<\\]?(?P<heredoc>" + word + ")", None, "\n", HereGrammar, r'^%(heredoc)s$'),
    RegionRule(r'heredoc', r"<<-(?P<heredoc>" + word + ")", None, "\n", HereGrammar, r'^ *%(heredoc)s$'),
    PatternRule(r'sh_function', word + r'(?= *\(\))'),
    PatternRule(r'sh_reserved', r"(?:done|do|elif|else|esac|fi|for|function|if|in|select|then|until|while|time)(?![a-zA-Z0-9_=/])"),
    RegionRule(r'case', r'case', None, 'in', CaseGrammar, r'esac'),
    PatternRule(r'sh_builtin', r"(?<![-a-zA-Z0-9_])(?:source|alias|bg|bind|break|builtin|cd|command|compgen|complete|declare|dirs|disown|echo|enable|eval|exec|exit|export|fc|fg|getops|hash|help|history|jobs|kill|let|local|logout|popd|printf|pushd|pwd|readonly|read|return|set|shift|shopt|suspend|times|trap|type|ulimit|umask|unalias|unset|wait)(?![a-zA-Z0-9_=/])(?![-a-zA-Z0-9_])"),
    RegionRule(r'test', r'(?<![^ \t])test(?![a-zA-Z0-9_=/])', TestGrammar, r';|\n'),
    RegionRule(r'test2', r'\[\[', TestGrammar, r'\]\]'),
    RegionRule(r'test3', r'\[', TestGrammar, r'\]'),
    PatternRule(r'redirect', r'<|>'),
    PatternRule(r'delimiter', r";;|[();{}|&><:=/]"),
    RegionRule(r'eval', r'`', EvalGrammar, r'`'),
    RegionRule(r'neval', r'\$\(', NevalGrammar, r'\)'),
    PatternRule(r'variable', r"\${(?:" + word + "|\?\$)}"),
    PatternRule(r"variable", r"\$" + word),
    #PatternRule(r'variable', r"\$(?=\()"),
    RegionRule(r'string', "'", StringGrammar1, "'"),
    RegionRule(r'string', '"', StringGrammar2, '"'),
    OverridePatternRule(r'comment', r'#@@:(?P<token>' + pname + '):(?P<mode>' + pname + ') *$'),
    PatternRule(r'comment', r'#.*$'),
    PatternRule(r'sh_bareword', r'(?:[-a-zA-Z0-9_.]|\\.)+'),
    PatternRule(r'continuation', r'\\\n$'),
    PatternRule(r'eol', r'\n$'),
]

class ShTabber(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 == 'sh_function'
    def _handle_close_token(self, currlvl, y, i):
        s = self.get_token(y, i).string
        if s == ')' and self.markers and self._peek_name() == "case":
            # we have to ignore ) when used in "case" statements.
            return currlvl
        else:
            return StackTabber._handle_close_token(self, currlvl, y, i)
    def _handle_other_token(self, currlvl, y, i):
        w = self.mode.tabwidth
        token  = self.get_token(y, i)
        fqname = token.fqname()
        if token.name == 'continuation':
            self._opt_append("cont", currlvl + w)
        elif token.name == 'sh_reserved' and token.string == 'else':
            currlvl -= w
        elif token.name == 'eol':
            self._opt_pop("cont")
        return currlvl

class ShCheckSyntax(Method):
    '''Check the syntax of a shell script'''
    def _execute(self, w, **vargs):
        app = w.application
        cmd = "bash -n %r" % w.buffer.path
        (status, output) = commands.getstatusoutput(cmd)
        if status == 0:
            app.set_error("Syntax OK")
            app.data_buffer("*Sh-Check-Syntax*", output, switch_to=False)
        else:
            app.data_buffer("*Sh-Check-Syntax*", output)

class BashStart(Interact):
    args  = []
    reuse = True
    def _execute(self, w, **vargs):
        Interact._execute(self, w, bname='*Bash*', cmd='bash')
class BashLoadFile(Interact):
    args  = []
    reuse = True
    def _execute(self, w, **vargs):
        path = w.buffer.path
        cmd = 'bash %r' % path
        Interact._execute(self, w, bname='*Bash*', cmd=cmd)
        b = w.application.get_buffer_by_name('*Bash*')

class Sh(Fundamental):
    name       = 'sh'
    paths      = ['/etc/profile']
    basenames  = ['.bashrc', '.bash_profile', '.profile']
    extensions = ['.bash', '.sh']
    #detection  = ['sh', 'bash']
    detection  = [re.compile('^#!(?:.+/)sh'), re.compile('^#!(?:.+/)bash')]
    grammar    = ShGrammar
    tabbercls  = ShTabber
    opentokens = ('delimiter', 'sh_reserved', 'case.start')
    opentags   = {'(': ')', '[': ']', '{': '}', 'do': 'done', 'then': 'fi',
                   'case': 'esac'}
    closetokens = ('delimiter', 'sh_reserved', 'case.end') 
    closetags   = {')': '(', ']': '[', '}': '{', 'done': 'do', 'fi': 'then',
                   'esac': 'case'}
    colors = {
        'sh_builtin':  ('cyan', 'default', 'bold'),
        'sh_function': ('magenta', 'default', 'bold'),
        'sh_reserved': ('magenta', 'default', 'bold'),
        'variable':    ('yellow', 'default', 'bold'),

        # case statements
        'case.start':             ('magenta', 'default', 'bold'),
        'case.stanza.start':      ('cyan', 'default', 'bold'),
        'case.stanza.start_cont': ('cyan', 'default', 'bold'),
        'case.stanza.middle0':    ('cyan', 'default', 'bold'),
        'case.middle0':           ('magenta', 'default', 'bold'),
        'case.end':               ('magenta', 'default', 'bold'),

        'test.start': ('cyan', 'default', 'bold'),
        'binop':      ('magenta', 'default', 'bold'),
        'unop':       ('magenta', 'default', 'bold'),

        'eval.start':     ('cyan', 'default', 'bold'),
        'eval.variable':  ('yellow', 'default', 'bold'),
        'eval.data':      ('cyan', 'default', 'bold'),
        'eval.null':      ('cyan', 'default', 'bold'),
        'eval.end':       ('cyan', 'default', 'bold'),
        'neval.start':    ('yellow', 'default', 'bold'),
        'neval.variable': ('yellow', 'default', 'bold'),
        'neval.data':     ('cyan', 'default', 'bold'),
        'neval.null':     ('cyan', 'default', 'bold'),
        'neval.end':      ('yellow', 'default', 'bold'),
    }
    actions = [ShCheckSyntax, BashStart, BashLoadFile]
    _bindings = {
        'sh-check-syntax': ('C-c s',),
    }

install = Sh.install