import color, mode2, tab2
from lex3 import Grammar, PatternRule, RegionRule

class StringGrammar(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"\$(?=\()"),
    ]

class ShGrammar(Grammar):
    rules = [
        PatternRule(r'function', r'[a-zA-Z_][a-zA-Z0-9_]*(?= *\(\))'),
        PatternRule(r'reserved', r"(?:case|done|do|elif|else|esac|fi|for|function|if|in|select|then|until|while|time)(?![a-zA-Z0-9_=/])"),
        PatternRule(r'builtin', r"(?: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'operator', r"(?:-eq|-ne|-gt|-lt|-ge|-le| = | != )"),
        PatternRule(r'delimiter', r";;|[\[\]\(\);\{\}|&><]"),
        RegionRule(r'eval', '`', StringGrammar, '`'),
        #RegionRule(r'neval', r'\$\(', None, r'\)'),
        RegionRule(r'neval', r'\$\(', StringGrammar, r'\)'),
        PatternRule(r'variable', r"(?:^|(?<= ))[a-zA-Z_][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', "'", Grammar(), "'"),
        RegionRule(r'string', '"', StringGrammar, '"'),
        PatternRule(r'comment', r'#.*$'),
        PatternRule(r'bareword', r'[a-zA-Z0-9_-]+'),
        PatternRule(r'continuation', r'\\\n$'),
        PatternRule(r'eol', r'\n$'),
    ]

class ShTabber(tab2.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 == '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 tab2.StackTabber._handle_close_token(self, currlvl, y, i)
    def _handle_other_token(self, currlvl, y, i):
        token  = self.get_token(y, i)
        fqname = token.fqname()
        if token.name == 'continuation':
            self._opt_append("cont", currlvl + 4)
        elif token.name == 'eol':
            self._opt_pop("cont")
        return currlvl

class Sh(mode2.Fundamental):
    grammar     = ShGrammar
    tabbercls   = ShTabber
    opentokens  = ('delimiter', 'reserved',)
    opentags    = {'(': ')', '[': ']', '{': '}',
                   'do': 'done', 'then': 'fi', 'case': 'esac'}
    closetokens = ('delimiter', 'reserved',)
    closetags   = {')': '(', ']': '[', '}': '{',
                   'done': 'do', 'fi': 'then', 'esac': 'case'}
    def __init__(self, w):
        mode2.Fundamental.__init__(self, w)
        self.colors = {
            'builtin':         color.build('cyan', 'default', 'bold'),
            'function':        color.build('magenta', 'default', 'bold'),
            'reserved':        color.build('magenta', 'default', 'bold'),
            'variable':        color.build('yellow', 'default', 'bold'),

            'delimiter':       color.build('default', 'default', 'bold'),
            'operator':        color.build('magenta', 'default', 'bold'),

            'string.start':    color.build('green', 'default'),
            'string.variable': color.build('yellow', 'default'),
            'string.null':     color.build('green', 'default'),
            'string.end':      color.build('green', 'default'),

            'eval.start':      color.build('cyan', 'default'),
            'eval.variable':   color.build('yellow', 'default'),
            'eval.null':       color.build('cyan', 'default'),
            'eval.end':        color.build('cyan', 'default'),

            #'neval.start':      color.build('cyan', 'default'),
            #'neval.end':        color.build('cyan', 'default'),
            'neval.start':      color.build('yellow', 'default'),
            'neval.variable':   color.build('yellow', 'default'),
            'neval.null':       color.build('cyan', 'default'),
            'neval.end':        color.build('yellow', 'default'),

            'comment':         color.build('red', 'default'),
            'continuation':    color.build('red', 'default'),
        }
    def name(self):
        return "Sh"