mbed.org implementation of the abstract SmartREST library for the Cumulocity Platform SmartREST protocol.
Dependents: MbedSmartRestMain MbedSmartRestMain
Parser.cpp
- Committer:
- Cumulocity
- Date:
- 2014-11-15
- Revision:
- 13:aba98ad2ac1b
- Parent:
- 11:e1bee9a77652
File content as of revision 13:aba98ad2ac1b:
/* * 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" #include <assert.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) { int status = -1; char read; reset(); record.clear(); while ((_state < STATE_COMPLETE) && (((read = source.read()) > 0) || ((status = source.status()) == DS_STATUS_OK))) parse(read); // successfully read record if (_state == STATE_COMPLETE) { if (!record.set(_buffer, _count)) return PARSER_INTERNAL_ERROR; return PARSER_SUCCESS; } if (_state == STATE_BLANK) { assert(status >= 0); if (status == DS_STATUS_CLOSED) return PARSER_END_OF_RESPONSE; else if (status == DS_STATUS_TIMEOUT) return PARSER_TIMEOUT_ERROR; else return PARSER_INTERNAL_ERROR; } assert(status >= 0); if (status == DS_STATUS_TIMEOUT) return PARSER_TIMEOUT_ERROR; else if (status == DS_STATUS_ERROR) return PARSER_INTERNAL_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; } /*-------------------------------------------------------------------------*/