mirror of https://gitee.com/bigwinds/arangodb
208 lines
6.6 KiB
C++
208 lines
6.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, query context
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "Aql/Query.h"
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#include "Aql/Parser.h"
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#include "BasicsC/json.h"
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#include "VocBase/vocbase.h"
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using namespace triagens::aql;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates a query
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////////////////////////////////////////////////////////////////////////////////
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Query::Query (TRI_vocbase_t* vocbase,
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char const* queryString,
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size_t queryLength,
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TRI_json_t* bindParameters)
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: _vocbase(vocbase),
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_queryString(queryString),
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_queryLength(queryLength),
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_type(AQL_QUERY_READ),
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_bindParameters(bindParameters),
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_error(),
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_ast() {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroys a query
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////////////////////////////////////////////////////////////////////////////////
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Query::~Query () {
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if (_bindParameters != nullptr) {
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TRI_FreeJson(TRI_UNKNOWN_MEM_ZONE, _bindParameters);
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief extract a region from the query
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////////////////////////////////////////////////////////////////////////////////
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std::string Query::extractRegion (int line,
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int column) const {
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// note: line numbers reported by bison/flex start at 1, columns start at 0
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int currentLine = 1;
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int currentColumn = 0;
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char c;
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char const* p = _queryString;
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while ((c = *p)) {
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if (currentLine > line ||
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(currentLine >= line && currentColumn >= column)) {
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break;
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}
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if (c == '\n') {
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++p;
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++currentLine;
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currentColumn = 0;
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}
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else if (c == '\r') {
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++p;
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++currentLine;
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currentColumn = 0;
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// eat a following newline
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if (*p == '\n') {
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++p;
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}
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}
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else {
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++currentColumn;
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++p;
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}
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}
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// p is pointing at the position in the query the parse error occurred at
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TRI_ASSERT(p >= _queryString);
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size_t offset = static_cast<size_t>(p - _queryString);
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static int const SNIPPET_LENGTH = 32;
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static char const* SNIPPET_SUFFIX = "...";
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if (_queryLength < offset + SNIPPET_LENGTH) {
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// return a copy of the region
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return std::string(_queryString + offset, _queryLength - offset);
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}
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// copy query part
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std::string result(_queryString + offset, SNIPPET_LENGTH);
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result.append(SNIPPET_SUFFIX);
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief register an error
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////////////////////////////////////////////////////////////////////////////////
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void Query::registerError (int errorCode,
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std::string const& explanation) {
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TRI_ASSERT(errorCode != TRI_ERROR_NO_ERROR);
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_error.code = errorCode;
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_error.explanation = explanation;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief register an error
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////////////////////////////////////////////////////////////////////////////////
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void Query::registerError (int errorCode) {
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TRI_ASSERT(errorCode != TRI_ERROR_NO_ERROR);
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_error.code = errorCode;
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_error.explanation = "";
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief execute an AQL query - TODO: implement and determine return type
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////////////////////////////////////////////////////////////////////////////////
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void Query::execute () {
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parseQuery();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief parse an AQL query - TODO: implement and determine return type
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////////////////////////////////////////////////////////////////////////////////
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void Query::parse () {
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parseQuery();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief explain an AQL query - TODO: implement and determine return type
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////////////////////////////////////////////////////////////////////////////////
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void Query::explain () {
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parseQuery();
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief parse an AQL query - TODO: implement and determine return type
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////////////////////////////////////////////////////////////////////////////////
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void Query::parseQuery () {
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Parser parser(this);
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bool result = parser.parse();
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if (! result) {
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std::cout << "PARSE ERROR IN QUERY" << std::endl;
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}
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else {
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std::cout << "QUERY PARSED SUCCESSFULLY" << std::endl;
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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