comparison mercurial/revset.py @ 29073:81bac118f9e2

revset: factor out common parsing function

29072:f86fa7168059

# the set of valid characters for the initial letter of symbols in
# alias declarations and definitions
_aliassyminitletters = set(c for c in [chr(i) for i in xrange(256)]
                           if c.isalnum() or c in '._@$' or ord(c) > 127)

def _parsealias(spec):
    """Parse alias declaration/definition ``spec``

    This allows symbol names to use also ``$`` as an initial letter
    (for backward compatibility), and callers of this function should
    examine whether ``$`` is used also for unexpected symbols or not.

    >>> _parsealias('foo($1)')
    ('func', ('symbol', 'foo'), ('symbol', '$1'))
    >>> _parsealias('foo bar')
    Traceback (most recent call last):
      ...
    ParseError: ('invalid token', 4)
    """
    p = parser.parser(elements)
    tree, pos = p.parse(tokenize(spec, syminitletters=_aliassyminitletters))
    if pos != len(spec):
        raise error.ParseError(_('invalid token'), pos)
    return parser.simplifyinfixops(tree, ('list', 'or'))

class _aliasrules(parser.basealiasrules):
    """Parsing and expansion rule set of revset aliases"""
    _section = _('revset alias')
    _parse = staticmethod(_parsealias)

        return ('string', ''.join(l))
    else:
        return tuple(foldconcat(t) for t in tree)

def parse(spec, lookup=None):
    p = parser.parser(elements)
    tree, pos = p.parse(tokenize(spec, lookup=lookup))
    if pos != len(spec):
        raise error.ParseError(_("invalid token"), pos)
    return parser.simplifyinfixops(tree, ('list', 'or'))

def posttreebuilthook(tree, repo):
    # hook for extensions to execute code on the optimized tree
    pass

29073:81bac118f9e2

# the set of valid characters for the initial letter of symbols in
# alias declarations and definitions
_aliassyminitletters = set(c for c in [chr(i) for i in xrange(256)]
                           if c.isalnum() or c in '._@$' or ord(c) > 127)

def _parsewith(spec, lookup=None, syminitletters=None):
    """Generate a parse tree of given spec with given tokenizing options

    >>> _parsewith('foo($1)', syminitletters=_aliassyminitletters)
    ('func', ('symbol', 'foo'), ('symbol', '$1'))
    >>> _parsewith('$1')
    Traceback (most recent call last):
      ...
    ParseError: ("syntax error in revset '$1'", 0)
    >>> _parsewith('foo bar')
    Traceback (most recent call last):
      ...
    ParseError: ('invalid token', 4)
    """
    p = parser.parser(elements)
    tree, pos = p.parse(tokenize(spec, lookup=lookup,
                                 syminitletters=syminitletters))
    if pos != len(spec):
        raise error.ParseError(_('invalid token'), pos)
    return parser.simplifyinfixops(tree, ('list', 'or'))

def _parsealias(spec):
    """Parse alias declaration/definition ``spec``

    This allows symbol names to use also ``$`` as an initial letter
    (for backward compatibility), and callers of this function should
    examine whether ``$`` is used also for unexpected symbols or not.
    """
    return _parsewith(spec, syminitletters=_aliassyminitletters)

class _aliasrules(parser.basealiasrules):
    """Parsing and expansion rule set of revset aliases"""
    _section = _('revset alias')
    _parse = staticmethod(_parsealias)

        return ('string', ''.join(l))
    else:
        return tuple(foldconcat(t) for t in tree)

def parse(spec, lookup=None):
    return _parsewith(spec, lookup=lookup)

def posttreebuilthook(tree, repo):
    # hook for extensions to execute code on the optimized tree
    pass