def tree_to_q (ast):
if ast.type == 'op':
myrpnRpnOp = z3950.RpnRpnOp ()
myrpnRpnOp.rpn1 = tree_to_q(ast.children[0])
myrpnRpnOp.rpn2 = tree_to_q(ast.children[1])
op = ast.leaf.lower ()
if op == 'not': op = 'and-not' # CCL spec of 'not' vs. Z39.50 spec of 'and-not'
myrpnRpnOp.op = (op, None)
return ('rpnRpnOp', myrpnRpnOp)
elif ast.type == 'relop':
# XXX but e.g. LC (http://lcweb.loc.gov/z3950/lcserver.html)
# doesn't support other relation attributes, either.
try:
relattr = relop_to_attrib [ast.leaf]
except(KeyError): # should never happen, how could we have lexed it?
raise UnimplError (ast.leaf)
def make_aelt (qual):
val = ('numeric', qual [1])
return z3950.AttributeElement (attributeType = qual[0],
attributeValue = val)
apt = z3950.AttributesPlusTerm ()
quallist = ast.children.quallist
if ast.leaf != '=':
quallist.append ((2,relattr)) # 2 is relation attribute
# see http://www.loc.gov/z3950/agency/markup/13.html ATR.1.1
apt.attributes = map (make_aelt, quallist)
apt.term = ('general', ast.children.val) # XXX update for V3?
return ('op', ('attrTerm', apt))
elif ast.type == 'set':
return ('op', ('resultSet', ast.leaf))
raise UnimplError("Bad ast type " + str(ast.type))
def toRPN(self, top=None):
"""rpnRpnOp"""
if not top:
top = self
op = z3950.RpnRpnOp()
op.rpn1 = self.leftOperand.toRPN(top)
op.rpn2 = self.rightOperand.toRPN(top)
op.op = self.boolean.toRPN(top)
return ('rpnRpnOp', op)
def query(self):
self.fetch_token()
left = self.subquery()
while 1:
if not self.currentToken:
break
bool = self.is_boolean()
if bool:
bool = self.boolean()
right = self.subquery()
# Put left into triple, make triple new left
op = z3950.RpnRpnOp()
op.rpn1 = left
op.rpn2 = right
op.op = bool
wrap = ('rpnRpnOp', op)
left = wrap
else:
break
return left
def complex(self):
op = z3950.RpnRpnOp()
op.op = self.boolean()
op.rpn1 = self.query_struct()
op.rpn2 = self.query_struct()
return ('rpnRpnOp', op)
