source: trip-planner-front/node_modules/jsonparse/jsonparse.js@ 6fe77af

Last change on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit
  • Property mode set to 100644
File size: 15.2 KB
Line 
1/*global Buffer*/
2// Named constants with unique integer values
3var C = {};
4// Tokens
5var LEFT_BRACE = C.LEFT_BRACE = 0x1;
6var RIGHT_BRACE = C.RIGHT_BRACE = 0x2;
7var LEFT_BRACKET = C.LEFT_BRACKET = 0x3;
8var RIGHT_BRACKET = C.RIGHT_BRACKET = 0x4;
9var COLON = C.COLON = 0x5;
10var COMMA = C.COMMA = 0x6;
11var TRUE = C.TRUE = 0x7;
12var FALSE = C.FALSE = 0x8;
13var NULL = C.NULL = 0x9;
14var STRING = C.STRING = 0xa;
15var NUMBER = C.NUMBER = 0xb;
16// Tokenizer States
17var START = C.START = 0x11;
18var STOP = C.STOP = 0x12;
19var TRUE1 = C.TRUE1 = 0x21;
20var TRUE2 = C.TRUE2 = 0x22;
21var TRUE3 = C.TRUE3 = 0x23;
22var FALSE1 = C.FALSE1 = 0x31;
23var FALSE2 = C.FALSE2 = 0x32;
24var FALSE3 = C.FALSE3 = 0x33;
25var FALSE4 = C.FALSE4 = 0x34;
26var NULL1 = C.NULL1 = 0x41;
27var NULL2 = C.NULL2 = 0x42;
28var NULL3 = C.NULL3 = 0x43;
29var NUMBER1 = C.NUMBER1 = 0x51;
30var NUMBER3 = C.NUMBER3 = 0x53;
31var STRING1 = C.STRING1 = 0x61;
32var STRING2 = C.STRING2 = 0x62;
33var STRING3 = C.STRING3 = 0x63;
34var STRING4 = C.STRING4 = 0x64;
35var STRING5 = C.STRING5 = 0x65;
36var STRING6 = C.STRING6 = 0x66;
37// Parser States
38var VALUE = C.VALUE = 0x71;
39var KEY = C.KEY = 0x72;
40// Parser Modes
41var OBJECT = C.OBJECT = 0x81;
42var ARRAY = C.ARRAY = 0x82;
43// Character constants
44var BACK_SLASH = "\\".charCodeAt(0);
45var FORWARD_SLASH = "\/".charCodeAt(0);
46var BACKSPACE = "\b".charCodeAt(0);
47var FORM_FEED = "\f".charCodeAt(0);
48var NEWLINE = "\n".charCodeAt(0);
49var CARRIAGE_RETURN = "\r".charCodeAt(0);
50var TAB = "\t".charCodeAt(0);
51
52var STRING_BUFFER_SIZE = 64 * 1024;
53
54function Parser() {
55 this.tState = START;
56 this.value = undefined;
57
58 this.string = undefined; // string data
59 this.stringBuffer = Buffer.alloc ? Buffer.alloc(STRING_BUFFER_SIZE) : new Buffer(STRING_BUFFER_SIZE);
60 this.stringBufferOffset = 0;
61 this.unicode = undefined; // unicode escapes
62 this.highSurrogate = undefined;
63
64 this.key = undefined;
65 this.mode = undefined;
66 this.stack = [];
67 this.state = VALUE;
68 this.bytes_remaining = 0; // number of bytes remaining in multi byte utf8 char to read after split boundary
69 this.bytes_in_sequence = 0; // bytes in multi byte utf8 char to read
70 this.temp_buffs = { "2": new Buffer(2), "3": new Buffer(3), "4": new Buffer(4) }; // for rebuilding chars split before boundary is reached
71
72 // Stream offset
73 this.offset = -1;
74}
75
76// Slow code to string converter (only used when throwing syntax errors)
77Parser.toknam = function (code) {
78 var keys = Object.keys(C);
79 for (var i = 0, l = keys.length; i < l; i++) {
80 var key = keys[i];
81 if (C[key] === code) { return key; }
82 }
83 return code && ("0x" + code.toString(16));
84};
85
86var proto = Parser.prototype;
87proto.onError = function (err) { throw err; };
88proto.charError = function (buffer, i) {
89 this.tState = STOP;
90 this.onError(new Error("Unexpected " + JSON.stringify(String.fromCharCode(buffer[i])) + " at position " + i + " in state " + Parser.toknam(this.tState)));
91};
92proto.appendStringChar = function (char) {
93 if (this.stringBufferOffset >= STRING_BUFFER_SIZE) {
94 this.string += this.stringBuffer.toString('utf8');
95 this.stringBufferOffset = 0;
96 }
97
98 this.stringBuffer[this.stringBufferOffset++] = char;
99};
100proto.appendStringBuf = function (buf, start, end) {
101 var size = buf.length;
102 if (typeof start === 'number') {
103 if (typeof end === 'number') {
104 if (end < 0) {
105 // adding a negative end decreeses the size
106 size = buf.length - start + end;
107 } else {
108 size = end - start;
109 }
110 } else {
111 size = buf.length - start;
112 }
113 }
114
115 if (size < 0) {
116 size = 0;
117 }
118
119 if (this.stringBufferOffset + size > STRING_BUFFER_SIZE) {
120 this.string += this.stringBuffer.toString('utf8', 0, this.stringBufferOffset);
121 this.stringBufferOffset = 0;
122 }
123
124 buf.copy(this.stringBuffer, this.stringBufferOffset, start, end);
125 this.stringBufferOffset += size;
126};
127proto.write = function (buffer) {
128 if (typeof buffer === "string") buffer = new Buffer(buffer);
129 var n;
130 for (var i = 0, l = buffer.length; i < l; i++) {
131 if (this.tState === START){
132 n = buffer[i];
133 this.offset++;
134 if(n === 0x7b){ this.onToken(LEFT_BRACE, "{"); // {
135 }else if(n === 0x7d){ this.onToken(RIGHT_BRACE, "}"); // }
136 }else if(n === 0x5b){ this.onToken(LEFT_BRACKET, "["); // [
137 }else if(n === 0x5d){ this.onToken(RIGHT_BRACKET, "]"); // ]
138 }else if(n === 0x3a){ this.onToken(COLON, ":"); // :
139 }else if(n === 0x2c){ this.onToken(COMMA, ","); // ,
140 }else if(n === 0x74){ this.tState = TRUE1; // t
141 }else if(n === 0x66){ this.tState = FALSE1; // f
142 }else if(n === 0x6e){ this.tState = NULL1; // n
143 }else if(n === 0x22){ // "
144 this.string = "";
145 this.stringBufferOffset = 0;
146 this.tState = STRING1;
147 }else if(n === 0x2d){ this.string = "-"; this.tState = NUMBER1; // -
148 }else{
149 if (n >= 0x30 && n < 0x40) { // 1-9
150 this.string = String.fromCharCode(n); this.tState = NUMBER3;
151 } else if (n === 0x20 || n === 0x09 || n === 0x0a || n === 0x0d) {
152 // whitespace
153 } else {
154 return this.charError(buffer, i);
155 }
156 }
157 }else if (this.tState === STRING1){ // After open quote
158 n = buffer[i]; // get current byte from buffer
159 // check for carry over of a multi byte char split between data chunks
160 // & fill temp buffer it with start of this data chunk up to the boundary limit set in the last iteration
161 if (this.bytes_remaining > 0) {
162 for (var j = 0; j < this.bytes_remaining; j++) {
163 this.temp_buffs[this.bytes_in_sequence][this.bytes_in_sequence - this.bytes_remaining + j] = buffer[j];
164 }
165
166 this.appendStringBuf(this.temp_buffs[this.bytes_in_sequence]);
167 this.bytes_in_sequence = this.bytes_remaining = 0;
168 i = i + j - 1;
169 } else if (this.bytes_remaining === 0 && n >= 128) { // else if no remainder bytes carried over, parse multi byte (>=128) chars one at a time
170 if (n <= 193 || n > 244) {
171 return this.onError(new Error("Invalid UTF-8 character at position " + i + " in state " + Parser.toknam(this.tState)));
172 }
173 if ((n >= 194) && (n <= 223)) this.bytes_in_sequence = 2;
174 if ((n >= 224) && (n <= 239)) this.bytes_in_sequence = 3;
175 if ((n >= 240) && (n <= 244)) this.bytes_in_sequence = 4;
176 if ((this.bytes_in_sequence + i) > buffer.length) { // if bytes needed to complete char fall outside buffer length, we have a boundary split
177 for (var k = 0; k <= (buffer.length - 1 - i); k++) {
178 this.temp_buffs[this.bytes_in_sequence][k] = buffer[i + k]; // fill temp buffer of correct size with bytes available in this chunk
179 }
180 this.bytes_remaining = (i + this.bytes_in_sequence) - buffer.length;
181 i = buffer.length - 1;
182 } else {
183 this.appendStringBuf(buffer, i, i + this.bytes_in_sequence);
184 i = i + this.bytes_in_sequence - 1;
185 }
186 } else if (n === 0x22) {
187 this.tState = START;
188 this.string += this.stringBuffer.toString('utf8', 0, this.stringBufferOffset);
189 this.stringBufferOffset = 0;
190 this.onToken(STRING, this.string);
191 this.offset += Buffer.byteLength(this.string, 'utf8') + 1;
192 this.string = undefined;
193 }
194 else if (n === 0x5c) {
195 this.tState = STRING2;
196 }
197 else if (n >= 0x20) { this.appendStringChar(n); }
198 else {
199 return this.charError(buffer, i);
200 }
201 }else if (this.tState === STRING2){ // After backslash
202 n = buffer[i];
203 if(n === 0x22){ this.appendStringChar(n); this.tState = STRING1;
204 }else if(n === 0x5c){ this.appendStringChar(BACK_SLASH); this.tState = STRING1;
205 }else if(n === 0x2f){ this.appendStringChar(FORWARD_SLASH); this.tState = STRING1;
206 }else if(n === 0x62){ this.appendStringChar(BACKSPACE); this.tState = STRING1;
207 }else if(n === 0x66){ this.appendStringChar(FORM_FEED); this.tState = STRING1;
208 }else if(n === 0x6e){ this.appendStringChar(NEWLINE); this.tState = STRING1;
209 }else if(n === 0x72){ this.appendStringChar(CARRIAGE_RETURN); this.tState = STRING1;
210 }else if(n === 0x74){ this.appendStringChar(TAB); this.tState = STRING1;
211 }else if(n === 0x75){ this.unicode = ""; this.tState = STRING3;
212 }else{
213 return this.charError(buffer, i);
214 }
215 }else if (this.tState === STRING3 || this.tState === STRING4 || this.tState === STRING5 || this.tState === STRING6){ // unicode hex codes
216 n = buffer[i];
217 // 0-9 A-F a-f
218 if ((n >= 0x30 && n < 0x40) || (n > 0x40 && n <= 0x46) || (n > 0x60 && n <= 0x66)) {
219 this.unicode += String.fromCharCode(n);
220 if (this.tState++ === STRING6) {
221 var intVal = parseInt(this.unicode, 16);
222 this.unicode = undefined;
223 if (this.highSurrogate !== undefined && intVal >= 0xDC00 && intVal < (0xDFFF + 1)) { //<56320,57343> - lowSurrogate
224 this.appendStringBuf(new Buffer(String.fromCharCode(this.highSurrogate, intVal)));
225 this.highSurrogate = undefined;
226 } else if (this.highSurrogate === undefined && intVal >= 0xD800 && intVal < (0xDBFF + 1)) { //<55296,56319> - highSurrogate
227 this.highSurrogate = intVal;
228 } else {
229 if (this.highSurrogate !== undefined) {
230 this.appendStringBuf(new Buffer(String.fromCharCode(this.highSurrogate)));
231 this.highSurrogate = undefined;
232 }
233 this.appendStringBuf(new Buffer(String.fromCharCode(intVal)));
234 }
235 this.tState = STRING1;
236 }
237 } else {
238 return this.charError(buffer, i);
239 }
240 } else if (this.tState === NUMBER1 || this.tState === NUMBER3) {
241 n = buffer[i];
242
243 switch (n) {
244 case 0x30: // 0
245 case 0x31: // 1
246 case 0x32: // 2
247 case 0x33: // 3
248 case 0x34: // 4
249 case 0x35: // 5
250 case 0x36: // 6
251 case 0x37: // 7
252 case 0x38: // 8
253 case 0x39: // 9
254 case 0x2e: // .
255 case 0x65: // e
256 case 0x45: // E
257 case 0x2b: // +
258 case 0x2d: // -
259 this.string += String.fromCharCode(n);
260 this.tState = NUMBER3;
261 break;
262 default:
263 this.tState = START;
264 var result = Number(this.string);
265
266 if (isNaN(result)){
267 return this.charError(buffer, i);
268 }
269
270 if ((this.string.match(/[0-9]+/) == this.string) && (result.toString() != this.string)) {
271 // Long string of digits which is an ID string and not valid and/or safe JavaScript integer Number
272 this.onToken(STRING, this.string);
273 } else {
274 this.onToken(NUMBER, result);
275 }
276
277 this.offset += this.string.length - 1;
278 this.string = undefined;
279 i--;
280 break;
281 }
282 }else if (this.tState === TRUE1){ // r
283 if (buffer[i] === 0x72) { this.tState = TRUE2; }
284 else { return this.charError(buffer, i); }
285 }else if (this.tState === TRUE2){ // u
286 if (buffer[i] === 0x75) { this.tState = TRUE3; }
287 else { return this.charError(buffer, i); }
288 }else if (this.tState === TRUE3){ // e
289 if (buffer[i] === 0x65) { this.tState = START; this.onToken(TRUE, true); this.offset+= 3; }
290 else { return this.charError(buffer, i); }
291 }else if (this.tState === FALSE1){ // a
292 if (buffer[i] === 0x61) { this.tState = FALSE2; }
293 else { return this.charError(buffer, i); }
294 }else if (this.tState === FALSE2){ // l
295 if (buffer[i] === 0x6c) { this.tState = FALSE3; }
296 else { return this.charError(buffer, i); }
297 }else if (this.tState === FALSE3){ // s
298 if (buffer[i] === 0x73) { this.tState = FALSE4; }
299 else { return this.charError(buffer, i); }
300 }else if (this.tState === FALSE4){ // e
301 if (buffer[i] === 0x65) { this.tState = START; this.onToken(FALSE, false); this.offset+= 4; }
302 else { return this.charError(buffer, i); }
303 }else if (this.tState === NULL1){ // u
304 if (buffer[i] === 0x75) { this.tState = NULL2; }
305 else { return this.charError(buffer, i); }
306 }else if (this.tState === NULL2){ // l
307 if (buffer[i] === 0x6c) { this.tState = NULL3; }
308 else { return this.charError(buffer, i); }
309 }else if (this.tState === NULL3){ // l
310 if (buffer[i] === 0x6c) { this.tState = START; this.onToken(NULL, null); this.offset += 3; }
311 else { return this.charError(buffer, i); }
312 }
313 }
314};
315proto.onToken = function (token, value) {
316 // Override this to get events
317};
318
319proto.parseError = function (token, value) {
320 this.tState = STOP;
321 this.onError(new Error("Unexpected " + Parser.toknam(token) + (value ? ("(" + JSON.stringify(value) + ")") : "") + " in state " + Parser.toknam(this.state)));
322};
323proto.push = function () {
324 this.stack.push({value: this.value, key: this.key, mode: this.mode});
325};
326proto.pop = function () {
327 var value = this.value;
328 var parent = this.stack.pop();
329 this.value = parent.value;
330 this.key = parent.key;
331 this.mode = parent.mode;
332 this.emit(value);
333 if (!this.mode) { this.state = VALUE; }
334};
335proto.emit = function (value) {
336 if (this.mode) { this.state = COMMA; }
337 this.onValue(value);
338};
339proto.onValue = function (value) {
340 // Override me
341};
342proto.onToken = function (token, value) {
343 if(this.state === VALUE){
344 if(token === STRING || token === NUMBER || token === TRUE || token === FALSE || token === NULL){
345 if (this.value) {
346 this.value[this.key] = value;
347 }
348 this.emit(value);
349 }else if(token === LEFT_BRACE){
350 this.push();
351 if (this.value) {
352 this.value = this.value[this.key] = {};
353 } else {
354 this.value = {};
355 }
356 this.key = undefined;
357 this.state = KEY;
358 this.mode = OBJECT;
359 }else if(token === LEFT_BRACKET){
360 this.push();
361 if (this.value) {
362 this.value = this.value[this.key] = [];
363 } else {
364 this.value = [];
365 }
366 this.key = 0;
367 this.mode = ARRAY;
368 this.state = VALUE;
369 }else if(token === RIGHT_BRACE){
370 if (this.mode === OBJECT) {
371 this.pop();
372 } else {
373 return this.parseError(token, value);
374 }
375 }else if(token === RIGHT_BRACKET){
376 if (this.mode === ARRAY) {
377 this.pop();
378 } else {
379 return this.parseError(token, value);
380 }
381 }else{
382 return this.parseError(token, value);
383 }
384 }else if(this.state === KEY){
385 if (token === STRING) {
386 this.key = value;
387 this.state = COLON;
388 } else if (token === RIGHT_BRACE) {
389 this.pop();
390 } else {
391 return this.parseError(token, value);
392 }
393 }else if(this.state === COLON){
394 if (token === COLON) { this.state = VALUE; }
395 else { return this.parseError(token, value); }
396 }else if(this.state === COMMA){
397 if (token === COMMA) {
398 if (this.mode === ARRAY) { this.key++; this.state = VALUE; }
399 else if (this.mode === OBJECT) { this.state = KEY; }
400
401 } else if (token === RIGHT_BRACKET && this.mode === ARRAY || token === RIGHT_BRACE && this.mode === OBJECT) {
402 this.pop();
403 } else {
404 return this.parseError(token, value);
405 }
406 }else{
407 return this.parseError(token, value);
408 }
409};
410
411Parser.C = C;
412
413module.exports = Parser;
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