comparison mercurial/revsetlang.py @ 32931:3292c0df64f7

revsetlang: check arguments passed to ancestors() before optimizing to only()

Future patches will add depth parameter to ancestors(), which isn't compatible
with only().

32930:c808507cfbf0

def _isnamedfunc(x, funcname):
    """Check if given tree matches named function"""
    return x and x[0] == 'func' and getsymbol(x[1]) == funcname

def _matchnamedfunc(x, funcname):
    """Return args tree if given tree matches named function; otherwise None

    This can't be used for testing a nullary function since its args tree
    is also None. Use _isnamedfunc() instead.

    >>> f('ancestors(A)', 'not ancestors(B)')
    ('list', ('symbol', 'A'), ('symbol', 'B'))
    """
    ta = _matchnamedfunc(revs, 'ancestors')
    tb = bases and bases[0] == 'not' and _matchnamedfunc(bases[1], 'ancestors')
    if ta and tb:
        return ('list', ta, tb)

def _fixops(x):
    """Rewrite raw parsed tree to resolve ambiguous syntax which cannot be
    handled well by our simple top-down parser"""

32931:3292c0df64f7

def _isnamedfunc(x, funcname):
    """Check if given tree matches named function"""
    return x and x[0] == 'func' and getsymbol(x[1]) == funcname

def _isposargs(x, n):
    """Check if given tree is n-length list of positional arguments"""
    l = getlist(x)
    return len(l) == n and all(y and y[0] != 'keyvalue' for y in l)

def _matchnamedfunc(x, funcname):
    """Return args tree if given tree matches named function; otherwise None

    This can't be used for testing a nullary function since its args tree
    is also None. Use _isnamedfunc() instead.

    >>> f('ancestors(A)', 'not ancestors(B)')
    ('list', ('symbol', 'A'), ('symbol', 'B'))
    """
    ta = _matchnamedfunc(revs, 'ancestors')
    tb = bases and bases[0] == 'not' and _matchnamedfunc(bases[1], 'ancestors')
    if _isposargs(ta, 1) and _isposargs(tb, 1):
        return ('list', ta, tb)

def _fixops(x):
    """Rewrite raw parsed tree to resolve ambiguous syntax which cannot be
    handled well by our simple top-down parser"""