import commands
import color, mode, tab
from lex import Grammar, PatternRule, RegionRule, PatternGroupRule, OverridePatternRule
from method import Method

class StringGrammar1(Grammar):
    rules = [
        PatternRule(r'data', r'[^\']+'),
    ]
class StringGrammar2(Grammar):
    rules = [
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        PatternRule(r'data', r'[^\\$"]+'),
    ]

class HereGrammar(Grammar):
    rules = [
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        PatternRule(r'data', r'[^\\$]+'),
    ]        

class EvalGrammar(Grammar):
    rules = [
        RegionRule(r'string', "'", StringGrammar1, "'"),
        RegionRule(r'string', '"', StringGrammar2, '"'),
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        PatternRule(r'data', r'[^\\`$]+'),
    ]
class NevalGrammar(Grammar):
    rules = [
        RegionRule(r'string', "'", Grammar, "'"),
        RegionRule(r'string', '"', StringGrammar2, '"'),
        PatternRule(r'escaped', r'\\.'),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        PatternRule(r'data', r'[^\\)$]+'),
    ]

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

class TestGrammar(Grammar):
    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|test|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)(?![a-zA-Z0-9_])'),
        PatternRule(r'unop', r'-[a-zA-Z](?![a-zA-Z0-9_])'),
        PatternRule(r'continuation', r'\\\n$'),
        PatternRule(r'redirect', r'<|>'),
        PatternRule(r'delimiter', r";;|[();{}|&><]"),
        RegionRule(r'test', r'test', 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"(?:^|(?<= ))[a-zA-Z_][a-zA-Z0-9_]*(?==)"),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        RegionRule(r'string', "'", StringGrammar1, "'"),
        RegionRule(r'string', '"', StringGrammar2, '"'),
        PatternRule(r'bareword', r'[-a-zA-Z0-9_.]+'),
    ]

class ShGrammar(Grammar):
    rules = [
        PatternGroupRule(r'vardecl', r'spaces', r'^ +', r'variable', r'[a-zA-Z_][a-zA-Z0-9_]*', r'delimiter', r'='),
        PatternGroupRule(r'vardecl', r'sh_builtin', r'(?:alias|export)', r'spaces', r' +', r'variable', r'[a-zA-Z_][a-zA-Z0-9_]*', r'delimiter', r'='),
        PatternRule(r'variable', r"^[a-zA-Z_][a-zA-Z0-9_]*(?==)"),

        PatternRule(r'spaces', r' +'),
        RegionRule(r'heredoc', r"<<[<\\]?(?P<heredoc>[a-zA-Z_][a-zA-Z0-9_]*)", None, "\n", HereGrammar, r'^%(heredoc)s$'),
        RegionRule(r'heredoc', r"<<-(?P<heredoc>[a-zA-Z_][a-zA-Z0-9_]*)", None, "\n", HereGrammar, r'^ *%(heredoc)s$'),
        PatternRule(r'sh_function', r'[a-zA-Z_][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_=/])"),
        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'test', 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"^[a-zA-Z_][a-zA-Z0-9_]*(?==)"),
        PatternRule(r'variable', r"\${(?:[a-zA-Z0-9_]+|\?\$)}"),
        PatternRule(r"variable", r"\$[a-zA-Z0-9_]*"),
        PatternRule(r'variable', r"\$(?=\()"),
        RegionRule(r'string', "'", StringGrammar1, "'"),
        RegionRule(r'string', '"', StringGrammar2, '"'),
        OverridePatternRule(r'comment', r'#@@:(?P<token>[.a-zA-Z0-9_]+):(?P<mode>[.a-zA-Z0-9_]+) *$'),
        PatternRule(r'comment', r'#.*$'),
        PatternRule(r'bareword', r'(?:[-a-zA-Z0-9_.]|\\.)+'),
        PatternRule(r'continuation', r'\\\n$'),
        PatternRule(r'eol', r'\n$'),
    ]

# hacks to get some circular grammar refs
rule = CaseGrammar.rules[2]
rule.pairs[1] = (ShGrammar, rule.pairs[1][1])
rule = CaseGrammar.rules[3]
rule.pairs[0] = (ShGrammar, rule.pairs[0][1])

class ShTabber(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 == '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 tab.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 Sh(mode.Fundamental):
    modename    = 'sh'
    paths       = ['/etc/profile']
    basenames   = ['.bashrc', '.bash_profile', '.profile']
    extensions  = ['.bash', '.sh']
    detection   = ['sh', '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]
    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.add_bindings('sh-check-syntax', ('C-c s',))

install = Sh.install