def parse_segment(expr):
"""
Segments occur between the slashes...
"""
mtch = matchSegment.search(expr)
if not (mtch):
return (None, expr)
tok = mtch.group()
siz = len(tok)
if "/" == tok:
return (trav_seg(), expr)
elif "." == tok:
if len(expr) > 1 and "." == expr[1]:
seg = parent_seg()
siz = 2
else:
seg = self_seg()
elif "*" == tok:
seg = wild_seg()
elif '"' == tok or "'" == tok:
(cur, siz) = unquote(expr)
seg = match_seg(cur)
else:
seg = match_seg(tok)
return (seg, expr[siz:])
def parse_term(expr):
mtch = matchTerm.search(expr)
if not(mtch): return (None,expr)
tok = mtch.group(); siz = len(tok)
if '/' == tok or '.' == tok:
return parse(expr)
if '(' == tok:
(term,expr) = parse_predicate(expr)
assert ')' == expr[0]
return (term,expr[1:])
elif '"' == tok or "'" == tok:
(val,siz) = unquote(expr)
else:
val = tok; siz = len(tok)
return (scalar(val),expr[siz:])
def parse_term(expr):
mtch = matchTerm.search(expr)
if not (mtch): return (None, expr)
tok = mtch.group()
siz = len(tok)
if '/' == tok or '.' == tok:
return parse(expr)
if '(' == tok:
(term, expr) = parse_predicate(expr)
assert ')' == expr[0]
return (term, expr[1:])
elif '"' == tok or "'" == tok:
(val, siz) = unquote(expr)
else:
val = tok
siz = len(tok)
return (scalar(val), expr[siz:])
def parse_segment(expr):
"""
Segments occur between the slashes...
"""
mtch = matchSegment.search(expr)
if not (mtch): return (None, expr)
tok = mtch.group()
siz = len(tok)
if '/' == tok: return (trav_seg(), expr)
elif '.' == tok:
if len(expr) > 1 and '.' == expr[1]:
seg = parent_seg()
siz = 2
else:
seg = self_seg()
elif '*' == tok:
seg = wild_seg()
elif '"' == tok or "'" == tok:
(cur, siz) = unquote(expr)
seg = match_seg(cur)
else:
seg = match_seg(tok)
return (seg, expr[siz:])
