# 2.3 imports
from optparse import OptionParser

# our imports
import lex

class ShGrammar(lex.Grammar):
    GRAMMAR_LIST = [
        {'name': "method",
         'expr': r"""[a-zA-Z_][a-zA-Z0-9_]*(?=\(\))""",
         'action': lex.make_token},
        
        {'name': 'reserved',
         'expr': r"""(?:case|done|do|elif|else|esac|fi|for|function|if|in|select|then|until|while|time)(?![a-zA-Z0-9_=])""",
         'action': lex.make_token},

        {'name': 'builtin',
         'expr': 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_=/])""",
         'action': lex.make_token},

        {'name': 'operator',
         'expr': r"""(?:-eq|-ne|-gt|-lt|-ge|-le| = | != )""",
         'action': lex.make_token},

##         {'name': 'redirection',
##          'expr': r"(?:[1-6] *)?> *(?:&[1-6]|(?:\\.|[^\\\"';| ])+)",
##          'action': lex.make_token},

        {'name': 'delimiter',
         'expr': """[][\(\);\{\}|&><]""",
         'action': lex.make_token},

##         {'name': 'variable0',
##          'expr': r"""(?:(?<=\n)|^) *[a-zA-Z_][a-zA-Z0-9_]*(?=\=)""",
##          'action': lex.make_token},
        {'name': 'variable0',
         'expr': r"""(?:(?<=\n) *|^ *| +)[a-zA-Z_][a-zA-Z0-9_]*(?=\=)""",
         'action': lex.make_token},
        
        {'name': "variable1",
         'expr': r"\${(?:[a-zA-Z0-9_]+|\?\$)}",
         'action': lex.make_token},
        
        {'name': "variable2",
         'expr': r"\$[^({][a-zA-Z0-9_]*",
         'action': lex.make_token},

        {'name': "variable3",
         'expr': r"\$(?=\()",
         'action': lex.make_token},
        
        {'name': "eval",
         'expr': r'`(?:\\.|[^\\`])*(?:`|.?$)',
         'action': lex.make_token},

        {'name': "string1",
         'expr': r'"(?:\\.|[^\\"])*(?:"|.?$)',
         'action': lex.make_token},
        
        {'name': "string2",
         'expr': r"'(?:\\.|[^\\'])*(?:'|.?$)",
         'action': lex.make_token},

        {'name': 'continuation',
         'expr': r"""\\(?= *(\n|$))""",
         'action': lex.make_token},

        {'name': "comment",
         'expr': r'[#].*(?:\n|$)',
         'action': lex.make_token},

        {'name': 'bareword',
         'expr': r"""[a-zA-Z0-9_-]+""",
         'action': lex.make_token},
        
        {'name': "default",
         'expr': r'\\.|.|\n',
         'action': lex.silent}
        ]

    def _default_rules(self):
        """subclasses can override this to define defaults for a grammar"""
        for rdir in ShGrammar.GRAMMAR_LIST:
            self.add_rule(**rdir)