json¶

JavaScript Object Notation parser.

Numbers become Number tokens, true, false and null become Name.Constant tokens, strings are yielded in string contexts, with String tokens and possibily String.Escape tokens for escaped characters.

Objects ({ ... }) become object contexts with alternating key and value child contexts. Arrays ([ ... ]) become array contexts.

class Json[source]¶

Bases: parce.language.Language

root¶

classmethod values()[source]¶

object¶

key¶

value¶

array¶

string¶

class JsonTransform[source]¶

Bases: parce.transform.Transform

Transforms a Json expression tree to the Python equivalent.

root(items)[source]¶

values(items)[source]¶: Yield values like the Json.values() classmethod generates.

object(items)[source]¶

key(items)[source]¶

value(items)[source]¶

array(items)[source]¶

string(items)[source]¶

Example:¶

Root lexicon Json.root and text:

{
  "comment": "JSON example",
  "title": "Frescobaldi",
  "background": "background.png",
  "icon-size": 80,
  "contents": [
    { "x": 449, "y": 320, "type": "link", "path": "/Applications"},
    { "x": 188, "y": 320, "type": "file", "path": "../dist/Frescobaldi.app"},
    { "x": 100, "y": 70, "type": "file", "path": "../README.txt" },
    { "x": 100, "y": 185, "type": "file", "path": "../ChangeLog.txt" },
    { "x": 540, "y": 70, "type": "file", "path": "../COPYING.txt" }
  ]
}

Result tree:

<Context Json.root at 0-485 (2 children)>
 ├╴<Token '{' at 0:1 (Delimiter)>
 ╰╴<Context Json.object at 4-485 (10 children)>
    ├╴<Context Json.key at 4-14 (3 children)>
    │  ├╴<Token '"' at 4:5 (Literal.String)>
    │  ├╴<Context Json.string at 5-13 (2 children)>
    │  │  ├╴<Token 'comment' at 5:12 (Literal.String)>
    │  │  ╰╴<Token '"' at 12:13 (Literal.String)>
    │  ╰╴<Token ':' at 13:14 (Delimiter)>
    ├╴<Context Json.value at 15-30 (3 children)>
    │  ├╴<Token '"' at 15:16 (Literal.String)>
    │  ├╴<Context Json.string at 16-29 (2 children)>
    │  │  ├╴<Token 'JSON example' at 16:28 (Literal.String)>
    │  │  ╰╴<Token '"' at 28:29 (Literal.String)>
    │  ╰╴<Token ',' at 29:30 (Delimiter)>
    ├╴<Context Json.key at 33-41 (3 children)>
    │  ├╴<Token '"' at 33:34 (Literal.String)>
    │  ├╴<Context Json.string at 34-40 (2 children)>
    │  │  ├╴<Token 'title' at 34:39 (Literal.String)>
    │  │  ╰╴<Token '"' at 39:40 (Literal.String)>
    │  ╰╴<Token ':' at 40:41 (Delimiter)>
    ├╴<Context Json.value at 42-56 (3 children)>
    │  ├╴<Token '"' at 42:43 (Literal.String)>
    │  ├╴<Context Json.string at 43-55 (2 children)>
    │  │  ├╴<Token 'Frescobaldi' at 43:54 (Literal.String)>
    │  │  ╰╴<Token '"' at 54:55 (Literal.String)>
    │  ╰╴<Token ',' at 55:56 (Delimiter)>
    ├╴<Context Json.key at 59-72 (3 children)>
    │  ├╴<Token '"' at 59:60 (Literal.String)>
    │  ├╴<Context Json.string at 60-71 (2 children)>
    │  │  ├╴<Token 'background' at 60:70 (Literal.String)>
    │  │  ╰╴<Token '"' at 70:71 (Literal.String)>
    │  ╰╴<Token ':' at 71:72 (Delimiter)>
    ├╴<Context Json.value at 73-90 (3 children)>
    │  ├╴<Token '"' at 73:74 (Literal.String)>
    │  ├╴<Context Json.string at 74-89 (2 children)>
    │  │  ├╴<Token 'background.png' at 74:88 (Literal.String)>
    │  │  ╰╴<Token '"' at 88:89 (Literal.String)>
    │  ╰╴<Token ',' at 89:90 (Delimiter)>
    ├╴<Context Json.key at 93-105 (3 children)>
    │  ├╴<Token '"' at 93:94 (Literal.String)>
    │  ├╴<Context Json.string at 94-104 (2 children)>
    │  │  ├╴<Token 'icon-size' at 94:103 (Literal.String)>
    │  │  ╰╴<Token '"' at 103:104 (Literal.String)>
    │  ╰╴<Token ':' at 104:105 (Delimiter)>
    ├╴<Context Json.value at 106-109 (2 children)>
    │  ├╴<Token '80' at 106:108 (Literal.Number)>
    │  ╰╴<Token ',' at 108:109 (Delimiter)>
    ├╴<Context Json.key at 112-123 (3 children)>
    │  ├╴<Token '"' at 112:113 (Literal.String)>
    │  ├╴<Context Json.string at 113-122 (2 children)>
    │  │  ├╴<Token 'contents' at 113:121 (Literal.String)>
    │  │  ╰╴<Token '"' at 121:122 (Literal.String)>
    │  ╰╴<Token ':' at 122:123 (Delimiter)>
    ╰╴<Context Json.value at 124-485 (3 children)>
       ├╴<Token '[' at 124:125 (Delimiter)>
       ├╴<Context Json.array at 130-483 (15 children)>
       │  ├╴<Token '{' at 130:131 (Delimiter)>
       │  ├╴<Context Json.object at 132-192 (8 children)>
       │  │  ├╴<Context Json.key at 132-136 (3 children)>
       │  │  │  ├╴<Token '"' at 132:133 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 133-135 (2 children)>
       │  │  │  │  ├╴<Token 'x' at 133:134 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 134:135 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 135:136 (Delimiter)>
       │  │  ├╴<Context Json.value at 137-141 (2 children)>
       │  │  │  ├╴<Token '449' at 137:140 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 140:141 (Delimiter)>
       │  │  ├╴<Context Json.key at 142-146 (3 children)>
       │  │  │  ├╴<Token '"' at 142:143 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 143-145 (2 children)>
       │  │  │  │  ├╴<Token 'y' at 143:144 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 144:145 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 145:146 (Delimiter)>
       │  │  ├╴<Context Json.value at 147-151 (2 children)>
       │  │  │  ├╴<Token '320' at 147:150 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 150:151 (Delimiter)>
       │  │  ├╴<Context Json.key at 152-159 (3 children)>
       │  │  │  ├╴<Token '"' at 152:153 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 153-158 (2 children)>
       │  │  │  │  ├╴<Token 'type' at 153:157 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 157:158 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 158:159 (Delimiter)>
       │  │  ├╴<Context Json.value at 160-167 (3 children)>
       │  │  │  ├╴<Token '"' at 160:161 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 161-166 (2 children)>
       │  │  │  │  ├╴<Token 'link' at 161:165 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 165:166 (Literal.String)>
       │  │  │  ╰╴<Token ',' at 166:167 (Delimiter)>
       │  │  ├╴<Context Json.key at 168-175 (3 children)>
       │  │  │  ├╴<Token '"' at 168:169 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 169-174 (2 children)>
       │  │  │  │  ├╴<Token 'path' at 169:173 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 173:174 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 174:175 (Delimiter)>
       │  │  ╰╴<Context Json.value at 176-192 (3 children)>
       │  │     ├╴<Token '"' at 176:177 (Literal.String)>
       │  │     ├╴<Context Json.string at 177-191 (2 children)>
       │  │     │  ├╴<Token '/Applications' at 177:190 (Literal.String)>
       │  │     │  ╰╴<Token '"' at 190:191 (Literal.String)>
       │  │     ╰╴<Token '}' at 191:192 (Delimiter)>
       │  ├╴<Token ',' at 192:193 (Delimiter)>
       │  ├╴<Token '{' at 198:199 (Delimiter)>
       │  ├╴<Context Json.object at 200-270 (8 children)>
       │  │  ├╴<Context Json.key at 200-204 (3 children)>
       │  │  │  ├╴<Token '"' at 200:201 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 201-203 (2 children)>
       │  │  │  │  ├╴<Token 'x' at 201:202 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 202:203 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 203:204 (Delimiter)>
       │  │  ├╴<Context Json.value at 205-209 (2 children)>
       │  │  │  ├╴<Token '188' at 205:208 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 208:209 (Delimiter)>
       │  │  ├╴<Context Json.key at 210-214 (3 children)>
       │  │  │  ├╴<Token '"' at 210:211 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 211-213 (2 children)>
       │  │  │  │  ├╴<Token 'y' at 211:212 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 212:213 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 213:214 (Delimiter)>
       │  │  ├╴<Context Json.value at 215-219 (2 children)>
       │  │  │  ├╴<Token '320' at 215:218 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 218:219 (Delimiter)>
       │  │  ├╴<Context Json.key at 220-227 (3 children)>
       │  │  │  ├╴<Token '"' at 220:221 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 221-226 (2 children)>
       │  │  │  │  ├╴<Token 'type' at 221:225 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 225:226 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 226:227 (Delimiter)>
       │  │  ├╴<Context Json.value at 228-235 (3 children)>
       │  │  │  ├╴<Token '"' at 228:229 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 229-234 (2 children)>
       │  │  │  │  ├╴<Token 'file' at 229:233 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 233:234 (Literal.String)>
       │  │  │  ╰╴<Token ',' at 234:235 (Delimiter)>
       │  │  ├╴<Context Json.key at 236-243 (3 children)>
       │  │  │  ├╴<Token '"' at 236:237 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 237-242 (2 children)>
       │  │  │  │  ├╴<Token 'path' at 237:241 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 241:242 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 242:243 (Delimiter)>
       │  │  ╰╴<Context Json.value at 244-270 (3 children)>
       │  │     ├╴<Token '"' at 244:245 (Literal.String)>
       │  │     ├╴<Context Json.string at 245-269 (2 children)>
       │  │     │  ├╴<Token '../dist/Frescobaldi.app' at 245:268 (Literal.String)>
       │  │     │  ╰╴<Token '"' at 268:269 (Literal.String)>
       │  │     ╰╴<Token '}' at 269:270 (Delimiter)>
       │  ├╴<Token ',' at 270:271 (Delimiter)>
       │  ├╴<Token '{' at 276:277 (Delimiter)>
       │  ├╴<Context Json.object at 278-338 (8 children)>
       │  │  ├╴<Context Json.key at 278-282 (3 children)>
       │  │  │  ├╴<Token '"' at 278:279 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 279-281 (2 children)>
       │  │  │  │  ├╴<Token 'x' at 279:280 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 280:281 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 281:282 (Delimiter)>
       │  │  ├╴<Context Json.value at 283-287 (2 children)>
       │  │  │  ├╴<Token '100' at 283:286 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 286:287 (Delimiter)>
       │  │  ├╴<Context Json.key at 288-292 (3 children)>
       │  │  │  ├╴<Token '"' at 288:289 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 289-291 (2 children)>
       │  │  │  │  ├╴<Token 'y' at 289:290 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 290:291 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 291:292 (Delimiter)>
       │  │  ├╴<Context Json.value at 293-296 (2 children)>
       │  │  │  ├╴<Token '70' at 293:295 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 295:296 (Delimiter)>
       │  │  ├╴<Context Json.key at 297-304 (3 children)>
       │  │  │  ├╴<Token '"' at 297:298 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 298-303 (2 children)>
       │  │  │  │  ├╴<Token 'type' at 298:302 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 302:303 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 303:304 (Delimiter)>
       │  │  ├╴<Context Json.value at 305-312 (3 children)>
       │  │  │  ├╴<Token '"' at 305:306 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 306-311 (2 children)>
       │  │  │  │  ├╴<Token 'file' at 306:310 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 310:311 (Literal.String)>
       │  │  │  ╰╴<Token ',' at 311:312 (Delimiter)>
       │  │  ├╴<Context Json.key at 313-320 (3 children)>
       │  │  │  ├╴<Token '"' at 313:314 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 314-319 (2 children)>
       │  │  │  │  ├╴<Token 'path' at 314:318 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 318:319 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 319:320 (Delimiter)>
       │  │  ╰╴<Context Json.value at 321-338 (3 children)>
       │  │     ├╴<Token '"' at 321:322 (Literal.String)>
       │  │     ├╴<Context Json.string at 322-336 (2 children)>
       │  │     │  ├╴<Token '../README.txt' at 322:335 (Literal.String)>
       │  │     │  ╰╴<Token '"' at 335:336 (Literal.String)>
       │  │     ╰╴<Token '}' at 337:338 (Delimiter)>
       │  ├╴<Token ',' at 338:339 (Delimiter)>
       │  ├╴<Token '{' at 344:345 (Delimiter)>
       │  ├╴<Context Json.object at 346-410 (8 children)>
       │  │  ├╴<Context Json.key at 346-350 (3 children)>
       │  │  │  ├╴<Token '"' at 346:347 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 347-349 (2 children)>
       │  │  │  │  ├╴<Token 'x' at 347:348 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 348:349 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 349:350 (Delimiter)>
       │  │  ├╴<Context Json.value at 351-355 (2 children)>
       │  │  │  ├╴<Token '100' at 351:354 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 354:355 (Delimiter)>
       │  │  ├╴<Context Json.key at 356-360 (3 children)>
       │  │  │  ├╴<Token '"' at 356:357 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 357-359 (2 children)>
       │  │  │  │  ├╴<Token 'y' at 357:358 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 358:359 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 359:360 (Delimiter)>
       │  │  ├╴<Context Json.value at 361-365 (2 children)>
       │  │  │  ├╴<Token '185' at 361:364 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 364:365 (Delimiter)>
       │  │  ├╴<Context Json.key at 366-373 (3 children)>
       │  │  │  ├╴<Token '"' at 366:367 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 367-372 (2 children)>
       │  │  │  │  ├╴<Token 'type' at 367:371 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 371:372 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 372:373 (Delimiter)>
       │  │  ├╴<Context Json.value at 374-381 (3 children)>
       │  │  │  ├╴<Token '"' at 374:375 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 375-380 (2 children)>
       │  │  │  │  ├╴<Token 'file' at 375:379 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 379:380 (Literal.String)>
       │  │  │  ╰╴<Token ',' at 380:381 (Delimiter)>
       │  │  ├╴<Context Json.key at 382-389 (3 children)>
       │  │  │  ├╴<Token '"' at 382:383 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 383-388 (2 children)>
       │  │  │  │  ├╴<Token 'path' at 383:387 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 387:388 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 388:389 (Delimiter)>
       │  │  ╰╴<Context Json.value at 390-410 (3 children)>
       │  │     ├╴<Token '"' at 390:391 (Literal.String)>
       │  │     ├╴<Context Json.string at 391-408 (2 children)>
       │  │     │  ├╴<Token '../ChangeLog.txt' at 391:407 (Literal.String)>
       │  │     │  ╰╴<Token '"' at 407:408 (Literal.String)>
       │  │     ╰╴<Token '}' at 409:410 (Delimiter)>
       │  ├╴<Token ',' at 410:411 (Delimiter)>
       │  ├╴<Token '{' at 416:417 (Delimiter)>
       │  ├╴<Context Json.object at 418-479 (8 children)>
       │  │  ├╴<Context Json.key at 418-422 (3 children)>
       │  │  │  ├╴<Token '"' at 418:419 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 419-421 (2 children)>
       │  │  │  │  ├╴<Token 'x' at 419:420 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 420:421 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 421:422 (Delimiter)>
       │  │  ├╴<Context Json.value at 423-427 (2 children)>
       │  │  │  ├╴<Token '540' at 423:426 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 426:427 (Delimiter)>
       │  │  ├╴<Context Json.key at 428-432 (3 children)>
       │  │  │  ├╴<Token '"' at 428:429 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 429-431 (2 children)>
       │  │  │  │  ├╴<Token 'y' at 429:430 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 430:431 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 431:432 (Delimiter)>
       │  │  ├╴<Context Json.value at 433-436 (2 children)>
       │  │  │  ├╴<Token '70' at 433:435 (Literal.Number)>
       │  │  │  ╰╴<Token ',' at 435:436 (Delimiter)>
       │  │  ├╴<Context Json.key at 437-444 (3 children)>
       │  │  │  ├╴<Token '"' at 437:438 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 438-443 (2 children)>
       │  │  │  │  ├╴<Token 'type' at 438:442 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 442:443 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 443:444 (Delimiter)>
       │  │  ├╴<Context Json.value at 445-452 (3 children)>
       │  │  │  ├╴<Token '"' at 445:446 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 446-451 (2 children)>
       │  │  │  │  ├╴<Token 'file' at 446:450 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 450:451 (Literal.String)>
       │  │  │  ╰╴<Token ',' at 451:452 (Delimiter)>
       │  │  ├╴<Context Json.key at 453-460 (3 children)>
       │  │  │  ├╴<Token '"' at 453:454 (Literal.String)>
       │  │  │  ├╴<Context Json.string at 454-459 (2 children)>
       │  │  │  │  ├╴<Token 'path' at 454:458 (Literal.String)>
       │  │  │  │  ╰╴<Token '"' at 458:459 (Literal.String)>
       │  │  │  ╰╴<Token ':' at 459:460 (Delimiter)>
       │  │  ╰╴<Context Json.value at 461-479 (3 children)>
       │  │     ├╴<Token '"' at 461:462 (Literal.String)>
       │  │     ├╴<Context Json.string at 462-477 (2 children)>
       │  │     │  ├╴<Token '../COPYING.txt' at 462:476 (Literal.String)>
       │  │     │  ╰╴<Token '"' at 476:477 (Literal.String)>
       │  │     ╰╴<Token '}' at 478:479 (Delimiter)>
       │  ╰╴<Token ']' at 482:483 (Delimiter)>
       ╰╴<Token '}' at 484:485 (Delimiter)>

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