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