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-/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
- * full list of contributors). Published under the 2-clause BSD license.
- * See license.txt in the OpenLayers distribution or repository for the
- * full text of the license. */
-
-/**
- * Note:
- * This work draws heavily from the public domain JSON serializer/deserializer
- * at http://www.json.org/json.js. Rewritten so that it doesn't modify
- * basic data prototypes.
- */
-
-/**
- * @requires OpenLayers/Format.js
- */
-
-/**
- * Class: OpenLayers.Format.JSON
- * A parser to read/write JSON safely. Create a new instance with the
- * <OpenLayers.Format.JSON> constructor.
- *
- * Inherits from:
- * - <OpenLayers.Format>
- */
-OpenLayers.Format.JSON = OpenLayers.Class(OpenLayers.Format, {
-
- /**
- * APIProperty: indent
- * {String} For "pretty" printing, the indent string will be used once for
- * each indentation level.
- */
- indent: " ",
-
- /**
- * APIProperty: space
- * {String} For "pretty" printing, the space string will be used after
- * the ":" separating a name/value pair.
- */
- space: " ",
-
- /**
- * APIProperty: newline
- * {String} For "pretty" printing, the newline string will be used at the
- * end of each name/value pair or array item.
- */
- newline: "\n",
-
- /**
- * Property: level
- * {Integer} For "pretty" printing, this is incremented/decremented during
- * serialization.
- */
- level: 0,
-
- /**
- * Property: pretty
- * {Boolean} Serialize with extra whitespace for structure. This is set
- * by the <write> method.
- */
- pretty: false,
-
- /**
- * Property: nativeJSON
- * {Boolean} Does the browser support native json?
- */
- nativeJSON: (function() {
- return !!(window.JSON && typeof JSON.parse == "function" && typeof JSON.stringify == "function");
- })(),
-
- /**
- * Constructor: OpenLayers.Format.JSON
- * Create a new parser for JSON.
- *
- * Parameters:
- * options - {Object} An optional object whose properties will be set on
- * this instance.
- */
-
- /**
- * APIMethod: read
- * Deserialize a json string.
- *
- * Parameters:
- * json - {String} A JSON string
- * filter - {Function} A function which will be called for every key and
- * value at every level of the final result. Each value will be
- * replaced by the result of the filter function. This can be used to
- * reform generic objects into instances of classes, or to transform
- * date strings into Date objects.
- *
- * Returns:
- * {Object} An object, array, string, or number .
- */
- read: function(json, filter) {
- var object;
- if (this.nativeJSON) {
- object = JSON.parse(json, filter);
- } else try {
- /**
- * Parsing happens in three stages. In the first stage, we run the
- * text against a regular expression which looks for non-JSON
- * characters. We are especially concerned with '()' and 'new'
- * because they can cause invocation, and '=' because it can
- * cause mutation. But just to be safe, we will reject all
- * unexpected characters.
- */
- if (/^[\],:{}\s]*$/.test(json.replace(/\\["\\\/bfnrtu]/g, '@').
- replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
- replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
-
- /**
- * In the second stage we use the eval function to compile the
- * text into a JavaScript structure. The '{' operator is
- * subject to a syntactic ambiguity in JavaScript - it can
- * begin a block or an object literal. We wrap the text in
- * parens to eliminate the ambiguity.
- */
- object = eval('(' + json + ')');
-
- /**
- * In the optional third stage, we recursively walk the new
- * structure, passing each name/value pair to a filter
- * function for possible transformation.
- */
- if(typeof filter === 'function') {
- function walk(k, v) {
- if(v && typeof v === 'object') {
- for(var i in v) {
- if(v.hasOwnProperty(i)) {
- v[i] = walk(i, v[i]);
- }
- }
- }
- return filter(k, v);
- }
- object = walk('', object);
- }
- }
- } catch(e) {
- // Fall through if the regexp test fails.
- }
-
- if(this.keepData) {
- this.data = object;
- }
-
- return object;
- },
-
- /**
- * APIMethod: write
- * Serialize an object into a JSON string.
- *
- * Parameters:
- * value - {String} The object, array, string, number, boolean or date
- * to be serialized.
- * pretty - {Boolean} Structure the output with newlines and indentation.
- * Default is false.
- *
- * Returns:
- * {String} The JSON string representation of the input value.
- */
- write: function(value, pretty) {
- this.pretty = !!pretty;
- var json = null;
- var type = typeof value;
- if(this.serialize[type]) {
- try {
- json = (!this.pretty && this.nativeJSON) ?
- JSON.stringify(value) :
- this.serialize[type].apply(this, [value]);
- } catch(err) {
- OpenLayers.Console.error("Trouble serializing: " + err);
- }
- }
- return json;
- },
-
- /**
- * Method: writeIndent
- * Output an indentation string depending on the indentation level.
- *
- * Returns:
- * {String} An appropriate indentation string.
- */
- writeIndent: function() {
- var pieces = [];
- if(this.pretty) {
- for(var i=0; i<this.level; ++i) {
- pieces.push(this.indent);
- }
- }
- return pieces.join('');
- },
-
- /**
- * Method: writeNewline
- * Output a string representing a newline if in pretty printing mode.
- *
- * Returns:
- * {String} A string representing a new line.
- */
- writeNewline: function() {
- return (this.pretty) ? this.newline : '';
- },
-
- /**
- * Method: writeSpace
- * Output a string representing a space if in pretty printing mode.
- *
- * Returns:
- * {String} A space.
- */
- writeSpace: function() {
- return (this.pretty) ? this.space : '';
- },
-
- /**
- * Property: serialize
- * Object with properties corresponding to the serializable data types.
- * Property values are functions that do the actual serializing.
- */
- serialize: {
- /**
- * Method: serialize.object
- * Transform an object into a JSON string.
- *
- * Parameters:
- * object - {Object} The object to be serialized.
- *
- * Returns:
- * {String} A JSON string representing the object.
- */
- 'object': function(object) {
- // three special objects that we want to treat differently
- if(object == null) {
- return "null";
- }
- if(object.constructor == Date) {
- return this.serialize.date.apply(this, [object]);
- }
- if(object.constructor == Array) {
- return this.serialize.array.apply(this, [object]);
- }
- var pieces = ['{'];
- this.level += 1;
- var key, keyJSON, valueJSON;
-
- var addComma = false;
- for(key in object) {
- if(object.hasOwnProperty(key)) {
- // recursive calls need to allow for sub-classing
- keyJSON = OpenLayers.Format.JSON.prototype.write.apply(this,
- [key, this.pretty]);
- valueJSON = OpenLayers.Format.JSON.prototype.write.apply(this,
- [object[key], this.pretty]);
- if(keyJSON != null && valueJSON != null) {
- if(addComma) {
- pieces.push(',');
- }
- pieces.push(this.writeNewline(), this.writeIndent(),
- keyJSON, ':', this.writeSpace(), valueJSON);
- addComma = true;
- }
- }
- }
-
- this.level -= 1;
- pieces.push(this.writeNewline(), this.writeIndent(), '}');
- return pieces.join('');
- },
-
- /**
- * Method: serialize.array
- * Transform an array into a JSON string.
- *
- * Parameters:
- * array - {Array} The array to be serialized
- *
- * Returns:
- * {String} A JSON string representing the array.
- */
- 'array': function(array) {
- var json;
- var pieces = ['['];
- this.level += 1;
-
- for(var i=0, len=array.length; i<len; ++i) {
- // recursive calls need to allow for sub-classing
- json = OpenLayers.Format.JSON.prototype.write.apply(this,
- [array[i], this.pretty]);
- if(json != null) {
- if(i > 0) {
- pieces.push(',');
- }
- pieces.push(this.writeNewline(), this.writeIndent(), json);
- }
- }
-
- this.level -= 1;
- pieces.push(this.writeNewline(), this.writeIndent(), ']');
- return pieces.join('');
- },
-
- /**
- * Method: serialize.string
- * Transform a string into a JSON string.
- *
- * Parameters:
- * string - {String} The string to be serialized
- *
- * Returns:
- * {String} A JSON string representing the string.
- */
- 'string': function(string) {
- // If the string contains no control characters, no quote characters, and no
- // backslash characters, then we can simply slap some quotes around it.
- // Otherwise we must also replace the offending characters with safe
- // sequences.
- var m = {
- '\b': '\\b',
- '\t': '\\t',
- '\n': '\\n',
- '\f': '\\f',
- '\r': '\\r',
- '"' : '\\"',
- '\\': '\\\\'
- };
- if(/["\\\x00-\x1f]/.test(string)) {
- return '"' + string.replace(/([\x00-\x1f\\"])/g, function(a, b) {
- var c = m[b];
- if(c) {
- return c;
- }
- c = b.charCodeAt();
- return '\\u00' +
- Math.floor(c / 16).toString(16) +
- (c % 16).toString(16);
- }) + '"';
- }
- return '"' + string + '"';
- },
-
- /**
- * Method: serialize.number
- * Transform a number into a JSON string.
- *
- * Parameters:
- * number - {Number} The number to be serialized.
- *
- * Returns:
- * {String} A JSON string representing the number.
- */
- 'number': function(number) {
- return isFinite(number) ? String(number) : "null";
- },
-
- /**
- * Method: serialize.boolean
- * Transform a boolean into a JSON string.
- *
- * Parameters:
- * bool - {Boolean} The boolean to be serialized.
- *
- * Returns:
- * {String} A JSON string representing the boolean.
- */
- 'boolean': function(bool) {
- return String(bool);
- },
-
- /**
- * Method: serialize.object
- * Transform a date into a JSON string.
- *
- * Parameters:
- * date - {Date} The date to be serialized.
- *
- * Returns:
- * {String} A JSON string representing the date.
- */
- 'date': function(date) {
- function format(number) {
- // Format integers to have at least two digits.
- return (number < 10) ? '0' + number : number;
- }
- return '"' + date.getFullYear() + '-' +
- format(date.getMonth() + 1) + '-' +
- format(date.getDate()) + 'T' +
- format(date.getHours()) + ':' +
- format(date.getMinutes()) + ':' +
- format(date.getSeconds()) + '"';
- }
- },
-
- CLASS_NAME: "OpenLayers.Format.JSON"
-
-});
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