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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <axiom_xpath.h>
#include "xpath_streaming.h"
#include "xpath_internals.h"
#include "xpath_internals_engine.h"
axiom_xpath_streaming_t
axiom_xpath_streaming_check_operation(
const axutil_env_t *env,
axiom_xpath_expression_t* expr,
int op_p)
{
axiom_xpath_operation_t *op;
if(op_p == AXIOM_XPATH_PARSE_END)
{
return AXIOM_XPATH_STREAMING_CONSTANT;
}
op = AXIOM_XPATH_OPR_EXPR_GET(op_p);
switch(op->opr)
{
case AXIOM_XPATH_OPERATION_CONTEXT_NODE:
case AXIOM_XPATH_OPERATION_ROOT_NODE:
return axiom_xpath_streaming_combine_dependent(AXIOM_XPATH_CHECK(op->op1),
AXIOM_XPATH_STREAMING_CONSTANT);
case AXIOM_XPATH_OPERATION_STEP:
return axiom_xpath_streaming_combine_dependent(AXIOM_XPATH_CHECK(op->op1),
AXIOM_XPATH_CHECK(op->op2));
case AXIOM_XPATH_OPERATION_RESULT:
return AXIOM_XPATH_STREAMING_CONSTANT;
case AXIOM_XPATH_OPERATION_UNION:
return axiom_xpath_streaming_combine_independent(AXIOM_XPATH_CHECK(op->op1),
AXIOM_XPATH_CHECK(op->op2));
case AXIOM_XPATH_OPERATION_EQUAL_EXPR:
return axiom_xpath_streaming_combine_independent(AXIOM_XPATH_CHECK(op->op1),
AXIOM_XPATH_CHECK(op->op2));
case AXIOM_XPATH_OPERATION_LITERAL:
return AXIOM_XPATH_STREAMING_CONSTANT;
case AXIOM_XPATH_OPERATION_NUMBER:
return AXIOM_XPATH_STREAMING_CONSTANT;
case AXIOM_XPATH_OPERATION_PATH_EXPRESSION:
return axiom_xpath_streaming_combine_dependent(AXIOM_XPATH_CHECK(op->op1),
AXIOM_XPATH_CHECK(op->op2));
case AXIOM_XPATH_OPERATION_NODE_TEST:
return axiom_xpath_streaming_check_node_test(env, expr, op);
case AXIOM_XPATH_OPERATION_PREDICATE:
return axiom_xpath_streaming_check_predicate(env, expr, op_p);
default:
#ifdef AXIOM_XPATH_DEBUG
printf("Unidentified operation.\n");
#endif
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
}
axiom_xpath_streaming_t
axiom_xpath_streaming_check_predicate(
const axutil_env_t *env,
axiom_xpath_expression_t* expr,
int op_p)
{
axiom_xpath_operation_t *op;
if(op_p == AXIOM_XPATH_PARSE_END)
{
return AXIOM_XPATH_STREAMING_CONSTANT;
}
op = AXIOM_XPATH_OPR_EXPR_GET(op_p);
return axiom_xpath_streaming_combine_dependent(AXIOM_XPATH_CHECK(op->op1), AXIOM_XPATH_CHECK(
op->op2));
}
axiom_xpath_streaming_t
axiom_xpath_streaming_check_node_test(
const axutil_env_t *env,
axiom_xpath_expression_t* expr,
axiom_xpath_operation_t *op)
{
axiom_xpath_axis_t axis = AXIOM_XPATH_AXIS_NONE;
axiom_xpath_streaming_t r;
if(!op->par2)
{
#ifdef AXIOM_XPATH_DEBUG
printf("axis is NULL in the step operator\n");
#endif
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
axis = *((axiom_xpath_axis_t *)op->par2);
switch(axis)
{
case AXIOM_XPATH_AXIS_ATTRIBUTE:
case AXIOM_XPATH_AXIS_CHILD:
break;
default:
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
r = axiom_xpath_streaming_check_predicate(env, expr, op->op1);
if(r != AXIOM_XPATH_STREAMING_ATTRIBUTE && r != AXIOM_XPATH_STREAMING_CONSTANT)
{
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
if(axis == AXIOM_XPATH_AXIS_ATTRIBUTE)
{
return AXIOM_XPATH_STREAMING_ATTRIBUTE;
}
else
{
return AXIOM_XPATH_STREAMING_SUPPORTED;
}
}
axiom_xpath_streaming_t
axiom_xpath_streaming_combine_dependent(
axiom_xpath_streaming_t r1,
axiom_xpath_streaming_t r2)
{
if(r1 == AXIOM_XPATH_STREAMING_NOT_SUPPORTED || r2 == AXIOM_XPATH_STREAMING_NOT_SUPPORTED)
{
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
else if(r1 == AXIOM_XPATH_STREAMING_SUPPORTED || r2 == AXIOM_XPATH_STREAMING_SUPPORTED)
{
return AXIOM_XPATH_STREAMING_SUPPORTED;
}
else if(r1 == AXIOM_XPATH_STREAMING_ATTRIBUTE || r2 == AXIOM_XPATH_STREAMING_ATTRIBUTE)
{
return AXIOM_XPATH_STREAMING_ATTRIBUTE;
}
else
{
return AXIOM_XPATH_STREAMING_CONSTANT;
}
}
axiom_xpath_streaming_t
axiom_xpath_streaming_combine_independent(
axiom_xpath_streaming_t r1,
axiom_xpath_streaming_t r2)
{
if(r1 == AXIOM_XPATH_STREAMING_NOT_SUPPORTED || r2 == AXIOM_XPATH_STREAMING_NOT_SUPPORTED)
{
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
else if(r1 == AXIOM_XPATH_STREAMING_CONSTANT || r2 == AXIOM_XPATH_STREAMING_CONSTANT)
{
if(r1 == AXIOM_XPATH_STREAMING_SUPPORTED || r2 == AXIOM_XPATH_STREAMING_SUPPORTED)
{
return AXIOM_XPATH_STREAMING_SUPPORTED;
}
else if(r1 == AXIOM_XPATH_STREAMING_ATTRIBUTE || r2 == AXIOM_XPATH_STREAMING_ATTRIBUTE)
{
return AXIOM_XPATH_STREAMING_ATTRIBUTE;
}
else
{
return AXIOM_XPATH_STREAMING_CONSTANT;
}
}
else if(r1 == AXIOM_XPATH_STREAMING_ATTRIBUTE || r2 == AXIOM_XPATH_STREAMING_ATTRIBUTE)
{
if(r1 == AXIOM_XPATH_STREAMING_SUPPORTED || r2 == AXIOM_XPATH_STREAMING_SUPPORTED)
{
return AXIOM_XPATH_STREAMING_SUPPORTED;
}
else
{
return AXIOM_XPATH_STREAMING_ATTRIBUTE;
}
}
else
{
return AXIOM_XPATH_STREAMING_NOT_SUPPORTED;
}
}
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