A client for the SmartREST protocol from Cumulocity.
Fork of MbedSmartRest by
Parser.cpp@0:f76673e7f275, 2014-01-23 (annotated)
- Committer:
- vwochnik
- Date:
- Thu Jan 23 14:36:46 2014 +0000
- Revision:
- 0:f76673e7f275
initial commit, only abstraction
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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vwochnik | 0:f76673e7f275 | 1 | /* |
vwochnik | 0:f76673e7f275 | 2 | * Parser.cpp |
vwochnik | 0:f76673e7f275 | 3 | * |
vwochnik | 0:f76673e7f275 | 4 | * Created on: Nov 1, 2013 |
vwochnik | 0:f76673e7f275 | 5 | * * Authors: Vincent Wochnik <v.wochnik@gmail.com> |
vwochnik | 0:f76673e7f275 | 6 | * |
vwochnik | 0:f76673e7f275 | 7 | * Copyright (c) 2013 Cumulocity GmbH |
vwochnik | 0:f76673e7f275 | 8 | * |
vwochnik | 0:f76673e7f275 | 9 | * Permission is hereby granted, free of charge, to any person obtaining |
vwochnik | 0:f76673e7f275 | 10 | * a copy of this software and associated documentation files (the |
vwochnik | 0:f76673e7f275 | 11 | * "Software"), to deal in the Software without restriction, including |
vwochnik | 0:f76673e7f275 | 12 | * without limitation the rights to use, copy, modify, merge, publish, |
vwochnik | 0:f76673e7f275 | 13 | * distribute, sublicense, and/or sell copies of the Software, and to |
vwochnik | 0:f76673e7f275 | 14 | * permit persons to whom the Software is furnished to do so, subject to |
vwochnik | 0:f76673e7f275 | 15 | * the following conditions: |
vwochnik | 0:f76673e7f275 | 16 | * |
vwochnik | 0:f76673e7f275 | 17 | * The above copyright notice and this permission notice shall be |
vwochnik | 0:f76673e7f275 | 18 | * included in all copies or substantial portions of the Software. |
vwochnik | 0:f76673e7f275 | 19 | * |
vwochnik | 0:f76673e7f275 | 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
vwochnik | 0:f76673e7f275 | 21 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
vwochnik | 0:f76673e7f275 | 22 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
vwochnik | 0:f76673e7f275 | 23 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
vwochnik | 0:f76673e7f275 | 24 | * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
vwochnik | 0:f76673e7f275 | 25 | * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
vwochnik | 0:f76673e7f275 | 26 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
vwochnik | 0:f76673e7f275 | 27 | */ |
vwochnik | 0:f76673e7f275 | 28 | |
vwochnik | 0:f76673e7f275 | 29 | #include "Parser.h" |
vwochnik | 0:f76673e7f275 | 30 | |
vwochnik | 0:f76673e7f275 | 31 | #define STATE_BLANK 0 |
vwochnik | 0:f76673e7f275 | 32 | #define STATE_STRUCTURE 1 |
vwochnik | 0:f76673e7f275 | 33 | #define STATE_VALUE 2 |
vwochnik | 0:f76673e7f275 | 34 | #define STATE_INQUOTES 3 |
vwochnik | 0:f76673e7f275 | 35 | #define STATE_AFTERQUOTE 4 |
vwochnik | 0:f76673e7f275 | 36 | #define STATE_COMPLETE 5 |
vwochnik | 0:f76673e7f275 | 37 | #define STATE_ERROR 6 |
vwochnik | 0:f76673e7f275 | 38 | |
vwochnik | 0:f76673e7f275 | 39 | Parser::Parser() |
vwochnik | 0:f76673e7f275 | 40 | { |
vwochnik | 0:f76673e7f275 | 41 | reset(); |
vwochnik | 0:f76673e7f275 | 42 | } |
vwochnik | 0:f76673e7f275 | 43 | |
vwochnik | 0:f76673e7f275 | 44 | uint8_t Parser::readFrom(AbstractDataSource& source, ParsedRecord& record) |
vwochnik | 0:f76673e7f275 | 45 | { |
vwochnik | 0:f76673e7f275 | 46 | uint8_t status; char read; |
vwochnik | 0:f76673e7f275 | 47 | |
vwochnik | 0:f76673e7f275 | 48 | reset(); |
vwochnik | 0:f76673e7f275 | 49 | record.set(NULL, 0); |
vwochnik | 0:f76673e7f275 | 50 | |
vwochnik | 0:f76673e7f275 | 51 | while ((_state < STATE_COMPLETE) && |
vwochnik | 0:f76673e7f275 | 52 | (((read = source.read()) > 0 ) || |
vwochnik | 0:f76673e7f275 | 53 | ((status = source.status()) == DS_STATUS_OK))) |
vwochnik | 0:f76673e7f275 | 54 | parse(read); |
vwochnik | 0:f76673e7f275 | 55 | |
vwochnik | 0:f76673e7f275 | 56 | if (_state == STATE_COMPLETE) |
vwochnik | 0:f76673e7f275 | 57 | record.set(_buffer, _count); |
vwochnik | 0:f76673e7f275 | 58 | |
vwochnik | 0:f76673e7f275 | 59 | if (_state == STATE_COMPLETE) |
vwochnik | 0:f76673e7f275 | 60 | return PARSER_SUCCESS; |
vwochnik | 0:f76673e7f275 | 61 | else if (_state == STATE_BLANK) |
vwochnik | 0:f76673e7f275 | 62 | if (status == DS_STATUS_CLOSED) |
vwochnik | 0:f76673e7f275 | 63 | return PARSER_END_OF_RESPONSE; |
vwochnik | 0:f76673e7f275 | 64 | else |
vwochnik | 0:f76673e7f275 | 65 | return PARSER_TIMEOUT_ERROR; |
vwochnik | 0:f76673e7f275 | 66 | else |
vwochnik | 0:f76673e7f275 | 67 | if (status == DS_STATUS_TIMEOUT) |
vwochnik | 0:f76673e7f275 | 68 | return PARSER_TIMEOUT_ERROR; |
vwochnik | 0:f76673e7f275 | 69 | else |
vwochnik | 0:f76673e7f275 | 70 | return PARSER_PARSE_ERROR; |
vwochnik | 0:f76673e7f275 | 71 | } |
vwochnik | 0:f76673e7f275 | 72 | |
vwochnik | 0:f76673e7f275 | 73 | void Parser::parse(char c) |
vwochnik | 0:f76673e7f275 | 74 | { |
vwochnik | 0:f76673e7f275 | 75 | if (_ptr-_buffer >= PARSER_BUFFER_SIZE) { |
vwochnik | 0:f76673e7f275 | 76 | _state = STATE_ERROR; |
vwochnik | 0:f76673e7f275 | 77 | return; |
vwochnik | 0:f76673e7f275 | 78 | } |
vwochnik | 0:f76673e7f275 | 79 | |
vwochnik | 0:f76673e7f275 | 80 | switch (_state) { |
vwochnik | 0:f76673e7f275 | 81 | case STATE_BLANK: |
vwochnik | 0:f76673e7f275 | 82 | _state = STATE_STRUCTURE; |
vwochnik | 0:f76673e7f275 | 83 | case STATE_STRUCTURE: |
vwochnik | 0:f76673e7f275 | 84 | switch (c) { |
vwochnik | 0:f76673e7f275 | 85 | case ' ': |
vwochnik | 0:f76673e7f275 | 86 | case '\t': |
vwochnik | 0:f76673e7f275 | 87 | case '\r': |
vwochnik | 0:f76673e7f275 | 88 | break; |
vwochnik | 0:f76673e7f275 | 89 | case '"': |
vwochnik | 0:f76673e7f275 | 90 | _state = STATE_INQUOTES; |
vwochnik | 0:f76673e7f275 | 91 | break; |
vwochnik | 0:f76673e7f275 | 92 | case ',': |
vwochnik | 0:f76673e7f275 | 93 | close(); |
vwochnik | 0:f76673e7f275 | 94 | break; |
vwochnik | 0:f76673e7f275 | 95 | case '\0': |
vwochnik | 0:f76673e7f275 | 96 | case '\n': |
vwochnik | 0:f76673e7f275 | 97 | if ((_count == 0) && (_length == 0)) { |
vwochnik | 0:f76673e7f275 | 98 | _state = STATE_BLANK; |
vwochnik | 0:f76673e7f275 | 99 | } else { |
vwochnik | 0:f76673e7f275 | 100 | close(); |
vwochnik | 0:f76673e7f275 | 101 | _state = STATE_COMPLETE; |
vwochnik | 0:f76673e7f275 | 102 | } |
vwochnik | 0:f76673e7f275 | 103 | break; |
vwochnik | 0:f76673e7f275 | 104 | default: |
vwochnik | 0:f76673e7f275 | 105 | if (_length > 0) { |
vwochnik | 0:f76673e7f275 | 106 | _state = STATE_ERROR; |
vwochnik | 0:f76673e7f275 | 107 | } else { |
vwochnik | 0:f76673e7f275 | 108 | _state = STATE_VALUE; |
vwochnik | 0:f76673e7f275 | 109 | parse(c); |
vwochnik | 0:f76673e7f275 | 110 | } |
vwochnik | 0:f76673e7f275 | 111 | break; |
vwochnik | 0:f76673e7f275 | 112 | } |
vwochnik | 0:f76673e7f275 | 113 | break; |
vwochnik | 0:f76673e7f275 | 114 | case STATE_VALUE: |
vwochnik | 0:f76673e7f275 | 115 | switch (c) { |
vwochnik | 0:f76673e7f275 | 116 | case ',': |
vwochnik | 0:f76673e7f275 | 117 | case '\n': |
vwochnik | 0:f76673e7f275 | 118 | _state = STATE_STRUCTURE; |
vwochnik | 0:f76673e7f275 | 119 | parse(c); |
vwochnik | 0:f76673e7f275 | 120 | break; |
vwochnik | 0:f76673e7f275 | 121 | case '"': |
vwochnik | 0:f76673e7f275 | 122 | _state = STATE_ERROR; |
vwochnik | 0:f76673e7f275 | 123 | break; |
vwochnik | 0:f76673e7f275 | 124 | default: |
vwochnik | 0:f76673e7f275 | 125 | if ((c == ' ') || (c == '\t') || (c == '\r')) |
vwochnik | 0:f76673e7f275 | 126 | _trailing++; |
vwochnik | 0:f76673e7f275 | 127 | else |
vwochnik | 0:f76673e7f275 | 128 | _trailing = 0; |
vwochnik | 0:f76673e7f275 | 129 | append(c); |
vwochnik | 0:f76673e7f275 | 130 | break; |
vwochnik | 0:f76673e7f275 | 131 | } |
vwochnik | 0:f76673e7f275 | 132 | break; |
vwochnik | 0:f76673e7f275 | 133 | case STATE_INQUOTES: |
vwochnik | 0:f76673e7f275 | 134 | switch (c) { |
vwochnik | 0:f76673e7f275 | 135 | case '"': |
vwochnik | 0:f76673e7f275 | 136 | _state = STATE_AFTERQUOTE; |
vwochnik | 0:f76673e7f275 | 137 | break; |
vwochnik | 0:f76673e7f275 | 138 | default: |
vwochnik | 0:f76673e7f275 | 139 | append(c); |
vwochnik | 0:f76673e7f275 | 140 | break; |
vwochnik | 0:f76673e7f275 | 141 | } |
vwochnik | 0:f76673e7f275 | 142 | break; |
vwochnik | 0:f76673e7f275 | 143 | case STATE_AFTERQUOTE: |
vwochnik | 0:f76673e7f275 | 144 | switch (c) { |
vwochnik | 0:f76673e7f275 | 145 | case '"': |
vwochnik | 0:f76673e7f275 | 146 | append(c); |
vwochnik | 0:f76673e7f275 | 147 | _state = STATE_INQUOTES; |
vwochnik | 0:f76673e7f275 | 148 | break; |
vwochnik | 0:f76673e7f275 | 149 | default: |
vwochnik | 0:f76673e7f275 | 150 | _state = STATE_STRUCTURE; |
vwochnik | 0:f76673e7f275 | 151 | parse(c); |
vwochnik | 0:f76673e7f275 | 152 | break; |
vwochnik | 0:f76673e7f275 | 153 | } |
vwochnik | 0:f76673e7f275 | 154 | break; |
vwochnik | 0:f76673e7f275 | 155 | } |
vwochnik | 0:f76673e7f275 | 156 | } |
vwochnik | 0:f76673e7f275 | 157 | |
vwochnik | 0:f76673e7f275 | 158 | void Parser::append(char c) |
vwochnik | 0:f76673e7f275 | 159 | { |
vwochnik | 0:f76673e7f275 | 160 | *_ptr++ = c; |
vwochnik | 0:f76673e7f275 | 161 | _length++; |
vwochnik | 0:f76673e7f275 | 162 | } |
vwochnik | 0:f76673e7f275 | 163 | |
vwochnik | 0:f76673e7f275 | 164 | void Parser::close() |
vwochnik | 0:f76673e7f275 | 165 | { |
vwochnik | 0:f76673e7f275 | 166 | _ptr -= _trailing; |
vwochnik | 0:f76673e7f275 | 167 | *_ptr++ = 0; |
vwochnik | 0:f76673e7f275 | 168 | _trailing = 0; |
vwochnik | 0:f76673e7f275 | 169 | _length = 0; |
vwochnik | 0:f76673e7f275 | 170 | _count++; |
vwochnik | 0:f76673e7f275 | 171 | } |
vwochnik | 0:f76673e7f275 | 172 | |
vwochnik | 0:f76673e7f275 | 173 | void Parser::reset() |
vwochnik | 0:f76673e7f275 | 174 | { |
vwochnik | 0:f76673e7f275 | 175 | _state = STATE_BLANK; |
vwochnik | 0:f76673e7f275 | 176 | _ptr = _buffer; |
vwochnik | 0:f76673e7f275 | 177 | _count = 0; |
vwochnik | 0:f76673e7f275 | 178 | _trailing = 0; |
vwochnik | 0:f76673e7f275 | 179 | _length = 0; |
vwochnik | 0:f76673e7f275 | 180 | } |