[209] | 1 | // Copyright Benoit Blanchon 2014-2016
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| 2 | // MIT License
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| 3 | //
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| 4 | // Arduino JSON library
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| 5 | // https://github.com/bblanchon/ArduinoJson
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| 6 | // If you like this project, please add a star!
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| 7 |
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| 8 | #include "../../include/ArduinoJson/Internals/JsonParser.hpp"
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| 9 |
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| 10 | #include "../../include/ArduinoJson/Internals/Comments.hpp"
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| 11 | #include "../../include/ArduinoJson/Internals/Encoding.hpp"
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| 12 | #include "../../include/ArduinoJson/JsonArray.hpp"
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| 13 | #include "../../include/ArduinoJson/JsonBuffer.hpp"
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| 14 | #include "../../include/ArduinoJson/JsonObject.hpp"
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| 15 |
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| 16 | using namespace ArduinoJson;
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| 17 | using namespace ArduinoJson::Internals;
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| 18 |
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| 19 | bool JsonParser::skip(char charToSkip) {
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| 20 | const char *ptr = skipSpacesAndComments(_readPtr);
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| 21 | if (*ptr != charToSkip) return false;
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| 22 | ptr++;
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| 23 | _readPtr = skipSpacesAndComments(ptr);
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| 24 | return true;
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| 25 | }
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| 26 |
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| 27 | bool JsonParser::parseAnythingTo(JsonVariant *destination) {
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| 28 | if (_nestingLimit == 0) return false;
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| 29 | _nestingLimit--;
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| 30 | bool success = parseAnythingToUnsafe(destination);
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| 31 | _nestingLimit++;
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| 32 | return success;
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| 33 | }
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| 34 |
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| 35 | inline bool JsonParser::parseAnythingToUnsafe(JsonVariant *destination) {
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| 36 | _readPtr = skipSpacesAndComments(_readPtr);
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| 37 |
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| 38 | switch (*_readPtr) {
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| 39 | case '[':
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| 40 | return parseArrayTo(destination);
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| 41 |
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| 42 | case '{':
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| 43 | return parseObjectTo(destination);
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| 44 |
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| 45 | default:
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| 46 | return parseStringTo(destination);
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | JsonArray &JsonParser::parseArray() {
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| 51 | // Create an empty array
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| 52 | JsonArray &array = _buffer->createArray();
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| 53 |
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| 54 | // Check opening braket
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| 55 | if (!skip('[')) goto ERROR_MISSING_BRACKET;
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| 56 | if (skip(']')) goto SUCCESS_EMPTY_ARRAY;
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| 57 |
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| 58 | // Read each value
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| 59 | for (;;) {
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| 60 | // 1 - Parse value
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| 61 | JsonVariant value;
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| 62 | if (!parseAnythingTo(&value)) goto ERROR_INVALID_VALUE;
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| 63 | if (!array.add(value)) goto ERROR_NO_MEMORY;
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| 64 |
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| 65 | // 2 - More values?
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| 66 | if (skip(']')) goto SUCCES_NON_EMPTY_ARRAY;
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| 67 | if (!skip(',')) goto ERROR_MISSING_COMMA;
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| 68 | }
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| 69 |
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| 70 | SUCCESS_EMPTY_ARRAY:
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| 71 | SUCCES_NON_EMPTY_ARRAY:
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| 72 | return array;
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| 73 |
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| 74 | ERROR_INVALID_VALUE:
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| 75 | ERROR_MISSING_BRACKET:
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| 76 | ERROR_MISSING_COMMA:
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| 77 | ERROR_NO_MEMORY:
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| 78 | return JsonArray::invalid();
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| 79 | }
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| 80 |
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| 81 | bool JsonParser::parseArrayTo(JsonVariant *destination) {
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| 82 | JsonArray &array = parseArray();
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| 83 | if (!array.success()) return false;
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| 84 |
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| 85 | *destination = array;
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| 86 | return true;
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| 87 | }
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| 88 |
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| 89 | JsonObject &JsonParser::parseObject() {
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| 90 | // Create an empty object
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| 91 | JsonObject &object = _buffer->createObject();
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| 92 |
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| 93 | // Check opening brace
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| 94 | if (!skip('{')) goto ERROR_MISSING_BRACE;
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| 95 | if (skip('}')) goto SUCCESS_EMPTY_OBJECT;
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| 96 |
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| 97 | // Read each key value pair
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| 98 | for (;;) {
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| 99 | // 1 - Parse key
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| 100 | const char *key = parseString();
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| 101 | if (!key) goto ERROR_INVALID_KEY;
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| 102 | if (!skip(':')) goto ERROR_MISSING_COLON;
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| 103 |
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| 104 | // 2 - Parse value
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| 105 | JsonVariant value;
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| 106 | if (!parseAnythingTo(&value)) goto ERROR_INVALID_VALUE;
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| 107 | if (!object.set(key, value)) goto ERROR_NO_MEMORY;
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| 108 |
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| 109 | // 3 - More keys/values?
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| 110 | if (skip('}')) goto SUCCESS_NON_EMPTY_OBJECT;
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| 111 | if (!skip(',')) goto ERROR_MISSING_COMMA;
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| 112 | }
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| 113 |
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| 114 | SUCCESS_EMPTY_OBJECT:
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| 115 | SUCCESS_NON_EMPTY_OBJECT:
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| 116 | return object;
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| 117 |
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| 118 | ERROR_INVALID_KEY:
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| 119 | ERROR_INVALID_VALUE:
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| 120 | ERROR_MISSING_BRACE:
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| 121 | ERROR_MISSING_COLON:
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| 122 | ERROR_MISSING_COMMA:
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| 123 | ERROR_NO_MEMORY:
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| 124 | return JsonObject::invalid();
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| 125 | }
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| 126 |
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| 127 | bool JsonParser::parseObjectTo(JsonVariant *destination) {
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| 128 | JsonObject &object = parseObject();
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| 129 | if (!object.success()) return false;
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| 130 |
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| 131 | *destination = object;
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| 132 | return true;
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| 133 | }
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| 134 |
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| 135 | static inline bool isInRange(char c, char min, char max) {
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| 136 | return min <= c && c <= max;
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| 137 | }
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| 138 |
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| 139 | static inline bool isLetterOrNumber(char c) {
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| 140 | return isInRange(c, '0', '9') || isInRange(c, 'a', 'z') ||
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| 141 | isInRange(c, 'A', 'Z') || c == '-' || c == '.';
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| 142 | }
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| 143 |
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| 144 | static inline bool isQuote(char c) { return c == '\'' || c == '\"'; }
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| 145 |
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| 146 | const char *JsonParser::parseString() {
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| 147 | const char *readPtr = _readPtr;
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| 148 | char *writePtr = _writePtr;
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| 149 |
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| 150 | char c = *readPtr;
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| 151 |
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| 152 | if (isQuote(c)) { // quotes
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| 153 | char stopChar = c;
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| 154 | for (;;) {
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| 155 | c = *++readPtr;
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| 156 | if (c == '\0') break;
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| 157 |
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| 158 | if (c == stopChar) {
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| 159 | readPtr++;
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| 160 | break;
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| 161 | }
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| 162 |
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| 163 | if (c == '\\') {
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| 164 | // replace char
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| 165 | c = Encoding::unescapeChar(*++readPtr);
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| 166 | if (c == '\0') break;
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| 167 | }
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| 168 |
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| 169 | *writePtr++ = c;
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| 170 | }
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| 171 | } else { // no quotes
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| 172 | for (;;) {
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| 173 | if (!isLetterOrNumber(c)) break;
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| 174 | *writePtr++ = c;
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| 175 | c = *++readPtr;
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| 176 | }
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| 177 | }
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| 178 | // end the string here
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| 179 | *writePtr++ = '\0';
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| 180 |
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| 181 | const char *startPtr = _writePtr;
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| 182 |
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| 183 | // update end ptr
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| 184 | _readPtr = readPtr;
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| 185 | _writePtr = writePtr;
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| 186 |
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| 187 | // return pointer to unquoted string
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| 188 | return startPtr;
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| 189 | }
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| 190 |
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| 191 | bool JsonParser::parseStringTo(JsonVariant *destination) {
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| 192 | bool hasQuotes = isQuote(_readPtr[0]);
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| 193 | const char *value = parseString();
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| 194 | if (value == NULL) return false;
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| 195 | if (hasQuotes) {
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| 196 | *destination = value;
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| 197 | } else {
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| 198 | *destination = Unparsed(value);
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| 199 | }
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| 200 | return true;
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| 201 | }
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