diff options
Diffstat (limited to 'axiom/src/xpath/xpath_streaming.c')
| -rwxr-xr-x | axiom/src/xpath/xpath_streaming.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/axiom/src/xpath/xpath_streaming.c b/axiom/src/xpath/xpath_streaming.c new file mode 100755 index 0000000..0488d5f --- /dev/null +++ b/axiom/src/xpath/xpath_streaming.c @@ -0,0 +1,213 @@ +/* + * 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; + } +} + |