mbed.org implementation of the abstract SmartREST library for the Cumulocity Platform SmartREST protocol.
Dependents: MbedSmartRestMain MbedSmartRestMain
Parser.cpp@4:059b8b90e0d9, 2014-07-09 (annotated)
- Committer:
- Cumulocity
- Date:
- Wed Jul 09 15:37:19 2014 +0200
- Revision:
- 4:059b8b90e0d9
- Parent:
- 0:099f76422485
- Child:
- 6:cd7ba1ddb664
Updated from revision b9c81426d0e6
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Cumulocity | 0:099f76422485 | 1 | /* |
Cumulocity | 0:099f76422485 | 2 | * Parser.cpp |
Cumulocity | 0:099f76422485 | 3 | * |
Cumulocity | 0:099f76422485 | 4 | * Created on: Nov 1, 2013 |
Cumulocity | 0:099f76422485 | 5 | * * Authors: Vincent Wochnik <v.wochnik@gmail.com> |
Cumulocity | 0:099f76422485 | 6 | * |
Cumulocity | 0:099f76422485 | 7 | * Copyright (c) 2013 Cumulocity GmbH |
Cumulocity | 0:099f76422485 | 8 | * |
Cumulocity | 0:099f76422485 | 9 | * Permission is hereby granted, free of charge, to any person obtaining |
Cumulocity | 0:099f76422485 | 10 | * a copy of this software and associated documentation files (the |
Cumulocity | 0:099f76422485 | 11 | * "Software"), to deal in the Software without restriction, including |
Cumulocity | 0:099f76422485 | 12 | * without limitation the rights to use, copy, modify, merge, publish, |
Cumulocity | 0:099f76422485 | 13 | * distribute, sublicense, and/or sell copies of the Software, and to |
Cumulocity | 0:099f76422485 | 14 | * permit persons to whom the Software is furnished to do so, subject to |
Cumulocity | 0:099f76422485 | 15 | * the following conditions: |
Cumulocity | 0:099f76422485 | 16 | * |
Cumulocity | 0:099f76422485 | 17 | * The above copyright notice and this permission notice shall be |
Cumulocity | 0:099f76422485 | 18 | * included in all copies or substantial portions of the Software. |
Cumulocity | 0:099f76422485 | 19 | * |
Cumulocity | 0:099f76422485 | 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
Cumulocity | 0:099f76422485 | 21 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
Cumulocity | 0:099f76422485 | 22 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
Cumulocity | 0:099f76422485 | 23 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
Cumulocity | 0:099f76422485 | 24 | * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
Cumulocity | 0:099f76422485 | 25 | * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
Cumulocity | 0:099f76422485 | 26 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
Cumulocity | 0:099f76422485 | 27 | */ |
Cumulocity | 0:099f76422485 | 28 | |
Cumulocity | 0:099f76422485 | 29 | #include "Parser.h" |
Cumulocity | 0:099f76422485 | 30 | |
Cumulocity | 0:099f76422485 | 31 | #define STATE_BLANK 0 |
Cumulocity | 0:099f76422485 | 32 | #define STATE_STRUCTURE 1 |
Cumulocity | 0:099f76422485 | 33 | #define STATE_VALUE 2 |
Cumulocity | 0:099f76422485 | 34 | #define STATE_INQUOTES 3 |
Cumulocity | 0:099f76422485 | 35 | #define STATE_AFTERQUOTE 4 |
Cumulocity | 0:099f76422485 | 36 | #define STATE_COMPLETE 5 |
Cumulocity | 0:099f76422485 | 37 | #define STATE_ERROR 6 |
Cumulocity | 0:099f76422485 | 38 | |
Cumulocity | 0:099f76422485 | 39 | Parser::Parser() |
Cumulocity | 0:099f76422485 | 40 | { |
Cumulocity | 0:099f76422485 | 41 | reset(); |
Cumulocity | 0:099f76422485 | 42 | } |
Cumulocity | 0:099f76422485 | 43 | |
Cumulocity | 0:099f76422485 | 44 | uint8_t Parser::readFrom(AbstractDataSource& source, ParsedRecord& record) |
Cumulocity | 0:099f76422485 | 45 | { |
Cumulocity | 0:099f76422485 | 46 | uint8_t status; char read; |
Cumulocity | 0:099f76422485 | 47 | |
Cumulocity | 0:099f76422485 | 48 | reset(); |
Cumulocity | 4:059b8b90e0d9 | 49 | record.clear(); |
Cumulocity | 0:099f76422485 | 50 | |
Cumulocity | 0:099f76422485 | 51 | while ((_state < STATE_COMPLETE) && |
Cumulocity | 0:099f76422485 | 52 | (((read = source.read()) > 0 ) || |
Cumulocity | 0:099f76422485 | 53 | ((status = source.status()) == DS_STATUS_OK))) |
Cumulocity | 0:099f76422485 | 54 | parse(read); |
Cumulocity | 0:099f76422485 | 55 | |
Cumulocity | 4:059b8b90e0d9 | 56 | if (_state == STATE_COMPLETE) { |
Cumulocity | 4:059b8b90e0d9 | 57 | if (!record.set(_buffer, _count)) |
Cumulocity | 4:059b8b90e0d9 | 58 | return PARSER_INTERNAL_ERROR; |
Cumulocity | 4:059b8b90e0d9 | 59 | } |
Cumulocity | 0:099f76422485 | 60 | |
Cumulocity | 0:099f76422485 | 61 | if (_state == STATE_COMPLETE) |
Cumulocity | 0:099f76422485 | 62 | return PARSER_SUCCESS; |
Cumulocity | 0:099f76422485 | 63 | else if (_state == STATE_BLANK) |
Cumulocity | 0:099f76422485 | 64 | if (status == DS_STATUS_CLOSED) |
Cumulocity | 0:099f76422485 | 65 | return PARSER_END_OF_RESPONSE; |
Cumulocity | 0:099f76422485 | 66 | else |
Cumulocity | 0:099f76422485 | 67 | return PARSER_TIMEOUT_ERROR; |
Cumulocity | 0:099f76422485 | 68 | else |
Cumulocity | 0:099f76422485 | 69 | if (status == DS_STATUS_TIMEOUT) |
Cumulocity | 0:099f76422485 | 70 | return PARSER_TIMEOUT_ERROR; |
Cumulocity | 0:099f76422485 | 71 | else |
Cumulocity | 0:099f76422485 | 72 | return PARSER_PARSE_ERROR; |
Cumulocity | 0:099f76422485 | 73 | } |
Cumulocity | 0:099f76422485 | 74 | |
Cumulocity | 0:099f76422485 | 75 | void Parser::parse(char c) |
Cumulocity | 0:099f76422485 | 76 | { |
Cumulocity | 0:099f76422485 | 77 | if (_ptr-_buffer >= SMARTREST_PARSER_BUFFER_SIZE) { |
Cumulocity | 0:099f76422485 | 78 | _state = STATE_ERROR; |
Cumulocity | 0:099f76422485 | 79 | return; |
Cumulocity | 0:099f76422485 | 80 | } |
Cumulocity | 0:099f76422485 | 81 | |
Cumulocity | 0:099f76422485 | 82 | switch (_state) { |
Cumulocity | 0:099f76422485 | 83 | case STATE_BLANK: |
Cumulocity | 0:099f76422485 | 84 | _state = STATE_STRUCTURE; |
Cumulocity | 0:099f76422485 | 85 | case STATE_STRUCTURE: |
Cumulocity | 0:099f76422485 | 86 | switch (c) { |
Cumulocity | 0:099f76422485 | 87 | case ' ': |
Cumulocity | 0:099f76422485 | 88 | case '\t': |
Cumulocity | 0:099f76422485 | 89 | case '\r': |
Cumulocity | 0:099f76422485 | 90 | break; |
Cumulocity | 0:099f76422485 | 91 | case '"': |
Cumulocity | 0:099f76422485 | 92 | _state = STATE_INQUOTES; |
Cumulocity | 0:099f76422485 | 93 | break; |
Cumulocity | 0:099f76422485 | 94 | case ',': |
Cumulocity | 0:099f76422485 | 95 | close(); |
Cumulocity | 0:099f76422485 | 96 | break; |
Cumulocity | 0:099f76422485 | 97 | case '\0': |
Cumulocity | 0:099f76422485 | 98 | case '\n': |
Cumulocity | 0:099f76422485 | 99 | if ((_count == 0) && (_length == 0)) { |
Cumulocity | 0:099f76422485 | 100 | _state = STATE_BLANK; |
Cumulocity | 0:099f76422485 | 101 | } else { |
Cumulocity | 0:099f76422485 | 102 | close(); |
Cumulocity | 0:099f76422485 | 103 | _state = STATE_COMPLETE; |
Cumulocity | 0:099f76422485 | 104 | } |
Cumulocity | 0:099f76422485 | 105 | break; |
Cumulocity | 0:099f76422485 | 106 | default: |
Cumulocity | 0:099f76422485 | 107 | if (_length > 0) { |
Cumulocity | 0:099f76422485 | 108 | _state = STATE_ERROR; |
Cumulocity | 0:099f76422485 | 109 | } else { |
Cumulocity | 0:099f76422485 | 110 | _state = STATE_VALUE; |
Cumulocity | 0:099f76422485 | 111 | parse(c); |
Cumulocity | 0:099f76422485 | 112 | } |
Cumulocity | 0:099f76422485 | 113 | break; |
Cumulocity | 0:099f76422485 | 114 | } |
Cumulocity | 0:099f76422485 | 115 | break; |
Cumulocity | 0:099f76422485 | 116 | case STATE_VALUE: |
Cumulocity | 0:099f76422485 | 117 | switch (c) { |
Cumulocity | 0:099f76422485 | 118 | case ',': |
Cumulocity | 0:099f76422485 | 119 | case '\n': |
Cumulocity | 0:099f76422485 | 120 | _state = STATE_STRUCTURE; |
Cumulocity | 0:099f76422485 | 121 | parse(c); |
Cumulocity | 0:099f76422485 | 122 | break; |
Cumulocity | 0:099f76422485 | 123 | case '"': |
Cumulocity | 0:099f76422485 | 124 | _state = STATE_ERROR; |
Cumulocity | 0:099f76422485 | 125 | break; |
Cumulocity | 0:099f76422485 | 126 | default: |
Cumulocity | 0:099f76422485 | 127 | if ((c == ' ') || (c == '\t') || (c == '\r')) |
Cumulocity | 0:099f76422485 | 128 | _trailing++; |
Cumulocity | 0:099f76422485 | 129 | else |
Cumulocity | 0:099f76422485 | 130 | _trailing = 0; |
Cumulocity | 0:099f76422485 | 131 | append(c); |
Cumulocity | 0:099f76422485 | 132 | break; |
Cumulocity | 0:099f76422485 | 133 | } |
Cumulocity | 0:099f76422485 | 134 | break; |
Cumulocity | 0:099f76422485 | 135 | case STATE_INQUOTES: |
Cumulocity | 0:099f76422485 | 136 | switch (c) { |
Cumulocity | 0:099f76422485 | 137 | case '"': |
Cumulocity | 0:099f76422485 | 138 | _state = STATE_AFTERQUOTE; |
Cumulocity | 0:099f76422485 | 139 | break; |
Cumulocity | 0:099f76422485 | 140 | default: |
Cumulocity | 0:099f76422485 | 141 | append(c); |
Cumulocity | 0:099f76422485 | 142 | break; |
Cumulocity | 0:099f76422485 | 143 | } |
Cumulocity | 0:099f76422485 | 144 | break; |
Cumulocity | 0:099f76422485 | 145 | case STATE_AFTERQUOTE: |
Cumulocity | 0:099f76422485 | 146 | switch (c) { |
Cumulocity | 0:099f76422485 | 147 | case '"': |
Cumulocity | 0:099f76422485 | 148 | append(c); |
Cumulocity | 0:099f76422485 | 149 | _state = STATE_INQUOTES; |
Cumulocity | 0:099f76422485 | 150 | break; |
Cumulocity | 0:099f76422485 | 151 | default: |
Cumulocity | 0:099f76422485 | 152 | _state = STATE_STRUCTURE; |
Cumulocity | 0:099f76422485 | 153 | parse(c); |
Cumulocity | 0:099f76422485 | 154 | break; |
Cumulocity | 0:099f76422485 | 155 | } |
Cumulocity | 0:099f76422485 | 156 | break; |
Cumulocity | 0:099f76422485 | 157 | } |
Cumulocity | 0:099f76422485 | 158 | } |
Cumulocity | 0:099f76422485 | 159 | |
Cumulocity | 0:099f76422485 | 160 | void Parser::append(char c) |
Cumulocity | 0:099f76422485 | 161 | { |
Cumulocity | 0:099f76422485 | 162 | *_ptr++ = c; |
Cumulocity | 0:099f76422485 | 163 | _length++; |
Cumulocity | 0:099f76422485 | 164 | } |
Cumulocity | 0:099f76422485 | 165 | |
Cumulocity | 0:099f76422485 | 166 | void Parser::close() |
Cumulocity | 0:099f76422485 | 167 | { |
Cumulocity | 0:099f76422485 | 168 | _ptr -= _trailing; |
Cumulocity | 0:099f76422485 | 169 | *_ptr++ = 0; |
Cumulocity | 0:099f76422485 | 170 | _trailing = 0; |
Cumulocity | 0:099f76422485 | 171 | _length = 0; |
Cumulocity | 0:099f76422485 | 172 | _count++; |
Cumulocity | 0:099f76422485 | 173 | } |
Cumulocity | 0:099f76422485 | 174 | |
Cumulocity | 0:099f76422485 | 175 | void Parser::reset() |
Cumulocity | 0:099f76422485 | 176 | { |
Cumulocity | 0:099f76422485 | 177 | _state = STATE_BLANK; |
Cumulocity | 0:099f76422485 | 178 | _ptr = _buffer; |
Cumulocity | 0:099f76422485 | 179 | _count = 0; |
Cumulocity | 0:099f76422485 | 180 | _trailing = 0; |
Cumulocity | 0:099f76422485 | 181 | _length = 0; |
Cumulocity | 0:099f76422485 | 182 | } |