mbed.org implementation of the abstract SmartREST library for the Cumulocity Platform SmartREST protocol.
Dependents: MbedSmartRestMain MbedSmartRestMain
Diff: Parser.cpp
- Revision:
- 0:099f76422485
- Child:
- 4:059b8b90e0d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Parser.cpp Thu Jul 03 20:38:04 2014 +0200 @@ -0,0 +1,180 @@ +/* + * Parser.cpp + * + * Created on: Nov 1, 2013 + * * Authors: Vincent Wochnik <v.wochnik@gmail.com> + * + * Copyright (c) 2013 Cumulocity GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include "Parser.h" + +#define STATE_BLANK 0 +#define STATE_STRUCTURE 1 +#define STATE_VALUE 2 +#define STATE_INQUOTES 3 +#define STATE_AFTERQUOTE 4 +#define STATE_COMPLETE 5 +#define STATE_ERROR 6 + +Parser::Parser() +{ + reset(); +} + +uint8_t Parser::readFrom(AbstractDataSource& source, ParsedRecord& record) +{ + uint8_t status; char read; + + reset(); + record.set(NULL, 0); + + while ((_state < STATE_COMPLETE) && + (((read = source.read()) > 0 ) || + ((status = source.status()) == DS_STATUS_OK))) + parse(read); + + if (_state == STATE_COMPLETE) + record.set(_buffer, _count); + + if (_state == STATE_COMPLETE) + return PARSER_SUCCESS; + else if (_state == STATE_BLANK) + if (status == DS_STATUS_CLOSED) + return PARSER_END_OF_RESPONSE; + else + return PARSER_TIMEOUT_ERROR; + else + if (status == DS_STATUS_TIMEOUT) + return PARSER_TIMEOUT_ERROR; + else + return PARSER_PARSE_ERROR; +} + +void Parser::parse(char c) +{ + if (_ptr-_buffer >= SMARTREST_PARSER_BUFFER_SIZE) { + _state = STATE_ERROR; + return; + } + + switch (_state) { + case STATE_BLANK: + _state = STATE_STRUCTURE; + case STATE_STRUCTURE: + switch (c) { + case ' ': + case '\t': + case '\r': + break; + case '"': + _state = STATE_INQUOTES; + break; + case ',': + close(); + break; + case '\0': + case '\n': + if ((_count == 0) && (_length == 0)) { + _state = STATE_BLANK; + } else { + close(); + _state = STATE_COMPLETE; + } + break; + default: + if (_length > 0) { + _state = STATE_ERROR; + } else { + _state = STATE_VALUE; + parse(c); + } + break; + } + break; + case STATE_VALUE: + switch (c) { + case ',': + case '\n': + _state = STATE_STRUCTURE; + parse(c); + break; + case '"': + _state = STATE_ERROR; + break; + default: + if ((c == ' ') || (c == '\t') || (c == '\r')) + _trailing++; + else + _trailing = 0; + append(c); + break; + } + break; + case STATE_INQUOTES: + switch (c) { + case '"': + _state = STATE_AFTERQUOTE; + break; + default: + append(c); + break; + } + break; + case STATE_AFTERQUOTE: + switch (c) { + case '"': + append(c); + _state = STATE_INQUOTES; + break; + default: + _state = STATE_STRUCTURE; + parse(c); + break; + } + break; + } +} + +void Parser::append(char c) +{ + *_ptr++ = c; + _length++; +} + +void Parser::close() +{ + _ptr -= _trailing; + *_ptr++ = 0; + _trailing = 0; + _length = 0; + _count++; +} + +void Parser::reset() +{ + _state = STATE_BLANK; + _ptr = _buffer; + _count = 0; + _trailing = 0; + _length = 0; +}