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Revision 1.1 - (hide annotations) (download) (as text)
Tue Feb 3 04:43:09 2009 UTC (16 years, 6 months ago) by wakaba
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clear-state attribute is now supported by all command elements

1 wakaba 1.1 /*
2     http://www.JSON.org/json2.js
3     2008-11-19
4    
5     Public Domain.
6    
7     NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
8    
9     See http://www.JSON.org/js.html
10    
11     This file creates a global JSON object containing two methods: stringify
12     and parse.
13    
14     JSON.stringify(value, replacer, space)
15     value any JavaScript value, usually an object or array.
16    
17     replacer an optional parameter that determines how object
18     values are stringified for objects. It can be a
19     function or an array of strings.
20    
21     space an optional parameter that specifies the indentation
22     of nested structures. If it is omitted, the text will
23     be packed without extra whitespace. If it is a number,
24     it will specify the number of spaces to indent at each
25     level. If it is a string (such as '\t' or ' '),
26     it contains the characters used to indent at each level.
27    
28     This method produces a JSON text from a JavaScript value.
29    
30     When an object value is found, if the object contains a toJSON
31     method, its toJSON method will be called and the result will be
32     stringified. A toJSON method does not serialize: it returns the
33     value represented by the name/value pair that should be serialized,
34     or undefined if nothing should be serialized. The toJSON method
35     will be passed the key associated with the value, and this will be
36     bound to the object holding the key.
37    
38     For example, this would serialize Dates as ISO strings.
39    
40     Date.prototype.toJSON = function (key) {
41     function f(n) {
42     // Format integers to have at least two digits.
43     return n < 10 ? '0' + n : n;
44     }
45    
46     return this.getUTCFullYear() + '-' +
47     f(this.getUTCMonth() + 1) + '-' +
48     f(this.getUTCDate()) + 'T' +
49     f(this.getUTCHours()) + ':' +
50     f(this.getUTCMinutes()) + ':' +
51     f(this.getUTCSeconds()) + 'Z';
52     };
53    
54     You can provide an optional replacer method. It will be passed the
55     key and value of each member, with this bound to the containing
56     object. The value that is returned from your method will be
57     serialized. If your method returns undefined, then the member will
58     be excluded from the serialization.
59    
60     If the replacer parameter is an array of strings, then it will be
61     used to select the members to be serialized. It filters the results
62     such that only members with keys listed in the replacer array are
63     stringified.
64    
65     Values that do not have JSON representations, such as undefined or
66     functions, will not be serialized. Such values in objects will be
67     dropped; in arrays they will be replaced with null. You can use
68     a replacer function to replace those with JSON values.
69     JSON.stringify(undefined) returns undefined.
70    
71     The optional space parameter produces a stringification of the
72     value that is filled with line breaks and indentation to make it
73     easier to read.
74    
75     If the space parameter is a non-empty string, then that string will
76     be used for indentation. If the space parameter is a number, then
77     the indentation will be that many spaces.
78    
79     Example:
80    
81     text = JSON.stringify(['e', {pluribus: 'unum'}]);
82     // text is '["e",{"pluribus":"unum"}]'
83    
84    
85     text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
86     // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
87    
88     text = JSON.stringify([new Date()], function (key, value) {
89     return this[key] instanceof Date ?
90     'Date(' + this[key] + ')' : value;
91     });
92     // text is '["Date(---current time---)"]'
93    
94    
95     JSON.parse(text, reviver)
96     This method parses a JSON text to produce an object or array.
97     It can throw a SyntaxError exception.
98    
99     The optional reviver parameter is a function that can filter and
100     transform the results. It receives each of the keys and values,
101     and its return value is used instead of the original value.
102     If it returns what it received, then the structure is not modified.
103     If it returns undefined then the member is deleted.
104    
105     Example:
106    
107     // Parse the text. Values that look like ISO date strings will
108     // be converted to Date objects.
109    
110     myData = JSON.parse(text, function (key, value) {
111     var a;
112     if (typeof value === 'string') {
113     a =
114     /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
115     if (a) {
116     return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
117     +a[5], +a[6]));
118     }
119     }
120     return value;
121     });
122    
123     myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
124     var d;
125     if (typeof value === 'string' &&
126     value.slice(0, 5) === 'Date(' &&
127     value.slice(-1) === ')') {
128     d = new Date(value.slice(5, -1));
129     if (d) {
130     return d;
131     }
132     }
133     return value;
134     });
135    
136    
137     This is a reference implementation. You are free to copy, modify, or
138     redistribute.
139    
140     This code should be minified before deployment.
141     See http://javascript.crockford.com/jsmin.html
142    
143     USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
144     NOT CONTROL.
145     */
146    
147     /*jslint evil: true */
148    
149     /*global JSON */
150    
151     /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
152     call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
153     getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
154     lastIndex, length, parse, prototype, push, replace, slice, stringify,
155     test, toJSON, toString, valueOf
156     */
157    
158     // Create a JSON object only if one does not already exist. We create the
159     // methods in a closure to avoid creating global variables.
160    
161     if (!this.JSON) {
162     JSON = {};
163     }
164     (function () {
165    
166     function f(n) {
167     // Format integers to have at least two digits.
168     return n < 10 ? '0' + n : n;
169     }
170    
171     if (typeof Date.prototype.toJSON !== 'function') {
172    
173     Date.prototype.toJSON = function (key) {
174    
175     return this.getUTCFullYear() + '-' +
176     f(this.getUTCMonth() + 1) + '-' +
177     f(this.getUTCDate()) + 'T' +
178     f(this.getUTCHours()) + ':' +
179     f(this.getUTCMinutes()) + ':' +
180     f(this.getUTCSeconds()) + 'Z';
181     };
182    
183     String.prototype.toJSON =
184     Number.prototype.toJSON =
185     Boolean.prototype.toJSON = function (key) {
186     return this.valueOf();
187     };
188     }
189    
190     var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
191     escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
192     gap,
193     indent,
194     meta = { // table of character substitutions
195     '\b': '\\b',
196     '\t': '\\t',
197     '\n': '\\n',
198     '\f': '\\f',
199     '\r': '\\r',
200     '"' : '\\"',
201     '\\': '\\\\'
202     },
203     rep;
204    
205    
206     function quote(string) {
207    
208     // If the string contains no control characters, no quote characters, and no
209     // backslash characters, then we can safely slap some quotes around it.
210     // Otherwise we must also replace the offending characters with safe escape
211     // sequences.
212    
213     escapable.lastIndex = 0;
214     return escapable.test(string) ?
215     '"' + string.replace(escapable, function (a) {
216     var c = meta[a];
217     return typeof c === 'string' ? c :
218     '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
219     }) + '"' :
220     '"' + string + '"';
221     }
222    
223    
224     function str(key, holder) {
225    
226     // Produce a string from holder[key].
227    
228     var i, // The loop counter.
229     k, // The member key.
230     v, // The member value.
231     length,
232     mind = gap,
233     partial,
234     value = holder[key];
235    
236     // If the value has a toJSON method, call it to obtain a replacement value.
237    
238     if (value && typeof value === 'object' &&
239     typeof value.toJSON === 'function') {
240     value = value.toJSON(key);
241     }
242    
243     // If we were called with a replacer function, then call the replacer to
244     // obtain a replacement value.
245    
246     if (typeof rep === 'function') {
247     value = rep.call(holder, key, value);
248     }
249    
250     // What happens next depends on the value's type.
251    
252     switch (typeof value) {
253     case 'string':
254     return quote(value);
255    
256     case 'number':
257    
258     // JSON numbers must be finite. Encode non-finite numbers as null.
259    
260     return isFinite(value) ? String(value) : 'null';
261    
262     case 'boolean':
263     case 'null':
264    
265     // If the value is a boolean or null, convert it to a string. Note:
266     // typeof null does not produce 'null'. The case is included here in
267     // the remote chance that this gets fixed someday.
268    
269     return String(value);
270    
271     // If the type is 'object', we might be dealing with an object or an array or
272     // null.
273    
274     case 'object':
275    
276     // Due to a specification blunder in ECMAScript, typeof null is 'object',
277     // so watch out for that case.
278    
279     if (!value) {
280     return 'null';
281     }
282    
283     // Make an array to hold the partial results of stringifying this object value.
284    
285     gap += indent;
286     partial = [];
287    
288     // Is the value an array?
289    
290     if (Object.prototype.toString.apply(value) === '[object Array]') {
291    
292     // The value is an array. Stringify every element. Use null as a placeholder
293     // for non-JSON values.
294    
295     length = value.length;
296     for (i = 0; i < length; i += 1) {
297     partial[i] = str(i, value) || 'null';
298     }
299    
300     // Join all of the elements together, separated with commas, and wrap them in
301     // brackets.
302    
303     v = partial.length === 0 ? '[]' :
304     gap ? '[\n' + gap +
305     partial.join(',\n' + gap) + '\n' +
306     mind + ']' :
307     '[' + partial.join(',') + ']';
308     gap = mind;
309     return v;
310     }
311    
312     // If the replacer is an array, use it to select the members to be stringified.
313    
314     if (rep && typeof rep === 'object') {
315     length = rep.length;
316     for (i = 0; i < length; i += 1) {
317     k = rep[i];
318     if (typeof k === 'string') {
319     v = str(k, value);
320     if (v) {
321     partial.push(quote(k) + (gap ? ': ' : ':') + v);
322     }
323     }
324     }
325     } else {
326    
327     // Otherwise, iterate through all of the keys in the object.
328    
329     for (k in value) {
330     if (Object.hasOwnProperty.call(value, k)) {
331     v = str(k, value);
332     if (v) {
333     partial.push(quote(k) + (gap ? ': ' : ':') + v);
334     }
335     }
336     }
337     }
338    
339     // Join all of the member texts together, separated with commas,
340     // and wrap them in braces.
341    
342     v = partial.length === 0 ? '{}' :
343     gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
344     mind + '}' : '{' + partial.join(',') + '}';
345     gap = mind;
346     return v;
347     }
348     }
349    
350     // If the JSON object does not yet have a stringify method, give it one.
351    
352     if (typeof JSON.stringify !== 'function') {
353     JSON.stringify = function (value, replacer, space) {
354    
355     // The stringify method takes a value and an optional replacer, and an optional
356     // space parameter, and returns a JSON text. The replacer can be a function
357     // that can replace values, or an array of strings that will select the keys.
358     // A default replacer method can be provided. Use of the space parameter can
359     // produce text that is more easily readable.
360    
361     var i;
362     gap = '';
363     indent = '';
364    
365     // If the space parameter is a number, make an indent string containing that
366     // many spaces.
367    
368     if (typeof space === 'number') {
369     for (i = 0; i < space; i += 1) {
370     indent += ' ';
371     }
372    
373     // If the space parameter is a string, it will be used as the indent string.
374    
375     } else if (typeof space === 'string') {
376     indent = space;
377     }
378    
379     // If there is a replacer, it must be a function or an array.
380     // Otherwise, throw an error.
381    
382     rep = replacer;
383     if (replacer && typeof replacer !== 'function' &&
384     (typeof replacer !== 'object' ||
385     typeof replacer.length !== 'number')) {
386     throw new Error('JSON.stringify');
387     }
388    
389     // Make a fake root object containing our value under the key of ''.
390     // Return the result of stringifying the value.
391    
392     return str('', {'': value});
393     };
394     }
395    
396    
397     // If the JSON object does not yet have a parse method, give it one.
398    
399     if (typeof JSON.parse !== 'function') {
400     JSON.parse = function (text, reviver) {
401    
402     // The parse method takes a text and an optional reviver function, and returns
403     // a JavaScript value if the text is a valid JSON text.
404    
405     var j;
406    
407     function walk(holder, key) {
408    
409     // The walk method is used to recursively walk the resulting structure so
410     // that modifications can be made.
411    
412     var k, v, value = holder[key];
413     if (value && typeof value === 'object') {
414     for (k in value) {
415     if (Object.hasOwnProperty.call(value, k)) {
416     v = walk(value, k);
417     if (v !== undefined) {
418     value[k] = v;
419     } else {
420     delete value[k];
421     }
422     }
423     }
424     }
425     return reviver.call(holder, key, value);
426     }
427    
428    
429     // Parsing happens in four stages. In the first stage, we replace certain
430     // Unicode characters with escape sequences. JavaScript handles many characters
431     // incorrectly, either silently deleting them, or treating them as line endings.
432    
433     cx.lastIndex = 0;
434     if (cx.test(text)) {
435     text = text.replace(cx, function (a) {
436     return '\\u' +
437     ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
438     });
439     }
440    
441     // In the second stage, we run the text against regular expressions that look
442     // for non-JSON patterns. We are especially concerned with '()' and 'new'
443     // because they can cause invocation, and '=' because it can cause mutation.
444     // But just to be safe, we want to reject all unexpected forms.
445    
446     // We split the second stage into 4 regexp operations in order to work around
447     // crippling inefficiencies in IE's and Safari's regexp engines. First we
448     // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
449     // replace all simple value tokens with ']' characters. Third, we delete all
450     // open brackets that follow a colon or comma or that begin the text. Finally,
451     // we look to see that the remaining characters are only whitespace or ']' or
452     // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
453    
454     if (/^[\],:{}\s]*$/.
455     test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
456     replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
457     replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
458    
459     // In the third stage we use the eval function to compile the text into a
460     // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
461     // in JavaScript: it can begin a block or an object literal. We wrap the text
462     // in parens to eliminate the ambiguity.
463    
464     j = eval('(' + text + ')');
465    
466     // In the optional fourth stage, we recursively walk the new structure, passing
467     // each name/value pair to a reviver function for possible transformation.
468    
469     return typeof reviver === 'function' ?
470     walk({'': j}, '') : j;
471     }
472    
473     // If the text is not JSON parseable, then a SyntaxError is thrown.
474    
475     throw new SyntaxError('JSON.parse');
476     };
477     }
478     })();

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