mirror of https://github.com/aria2/aria2
122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2012 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_JSON_PARSER_H
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#define D_JSON_PARSER_H
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#include "common.h"
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#include <stack>
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namespace aria2 {
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class StructParserStateMachine;
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namespace json {
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enum JsonError {
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ERR_UNEXPECTED_CHAR_BEFORE_VAL = -1,
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ERR_UNEXPECTED_CHAR_BEFORE_OBJ_KEY = -2,
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ERR_UNEXPECTED_CHAR_BEFORE_OBJ_VAL = -3,
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ERR_UNEXPECTED_CHAR_BEFORE_OBJ_SEP = -4,
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ERR_INVALID_UNICODE_POINT = -5,
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ERR_INVALID_NUMBER = -6,
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ERR_NUMBER_OUT_OF_RANGE = -7,
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ERR_UNEXPECTED_CHAR_BEFORE_ARRAY_SEP = -8,
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ERR_UNEXPECTED_LITERAL = -9,
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ERR_PREMATURE_DATA = -10,
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ERR_STRUCTURE_TOO_DEEP = -11
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};
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class JsonParser {
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public:
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JsonParser(StructParserStateMachine* psm);
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~JsonParser();
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// Parses |size| bytes of data |data| and returns the number of
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// bytes processed. On error, one of the negative error codes is
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// returned.
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ssize_t parseUpdate(const char* data, size_t size);
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// Parses |size| bytes of data |data| and returns the number of
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// bytes processed. On error, one of the negative error codes is
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// returned. Call this function to signal the parser that this is
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// the last piece of data. This function does NOT reset the internal
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// state.
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ssize_t parseFinal(const char* data, size_t size);
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// Resets the internal state of the parser and makes it ready for
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// reuse.
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void reset();
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private:
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int pushState(int state);
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int stateTop() const;
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int popState();
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void runBeginCallback(int elementType);
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void runEndCallback(int elementType);
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void runCharactersCallback(const char* data, size_t len);
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void runNumberCallback(int64_t number, int frac, int exp);
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void runBoolCallback(bool bval);
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void onStringEnd();
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void onNumberEnd();
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void onObjectEnd();
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void onArrayEnd();
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void onValueEnd();
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void onBoolEnd();
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void onNullEnd();
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void consumeUnicode(char c);
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int consumeLowSurrogate(char c);
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StructParserStateMachine* psm_;
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std::stack<int> stateStack_;
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int currentState_;
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// Unicode codepoint
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uint16_t codepoint_;
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// For low-surrogate codepoint
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uint16_t codepoint2_;
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int numberSign_;
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int64_t number_;
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int frac_;
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int expSign_;
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int exp_;
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size_t numConsumed_;
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int lastError_;
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};
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} // namespace json
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} // namespace aria2
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#endif // D_JSON_PARSER_H
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