forked from zhurui/management
185 lines
6.2 KiB
JavaScript
185 lines
6.2 KiB
JavaScript
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/*!
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Copyright (C) 2013 by WebReflection
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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var
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// should be a not so common char
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// possibly one JSON does not encode
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// possibly one encodeURIComponent does not encode
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// right now this char is '~' but this might change in the future
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specialChar = '~',
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safeSpecialChar = '\\x' + (
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'0' + specialChar.charCodeAt(0).toString(16)
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).slice(-2),
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escapedSafeSpecialChar = '\\' + safeSpecialChar,
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specialCharRG = new RegExp(safeSpecialChar, 'g'),
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safeSpecialCharRG = new RegExp(escapedSafeSpecialChar, 'g'),
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safeStartWithSpecialCharRG = new RegExp('(?:^|([^\\\\]))' + escapedSafeSpecialChar),
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indexOf = [].indexOf || function(v){
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for(var i=this.length;i--&&this[i]!==v;);
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return i;
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},
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$String = String // there's no way to drop warnings in JSHint
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// about new String ... well, I need that here!
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// faked, and happy linter!
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;
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function generateReplacer(value, replacer, resolve) {
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var
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path = [],
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all = [value],
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seen = [value],
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mapp = [resolve ? specialChar : '[Circular]'],
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last = value,
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lvl = 1,
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i
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;
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return function(key, value) {
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// the replacer has rights to decide
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// if a new object should be returned
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// or if there's some key to drop
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// let's call it here rather than "too late"
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if (replacer) value = replacer.call(this, key, value);
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// did you know ? Safari passes keys as integers for arrays
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// which means if (key) when key === 0 won't pass the check
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if (key !== '') {
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if (last !== this) {
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i = lvl - indexOf.call(all, this) - 1;
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lvl -= i;
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all.splice(lvl, all.length);
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path.splice(lvl - 1, path.length);
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last = this;
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}
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// console.log(lvl, key, path);
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if (typeof value === 'object' && value) {
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// if object isn't referring to parent object, add to the
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// object path stack. Otherwise it is already there.
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if (indexOf.call(all, value) < 0) {
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all.push(last = value);
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}
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lvl = all.length;
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i = indexOf.call(seen, value);
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if (i < 0) {
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i = seen.push(value) - 1;
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if (resolve) {
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// key cannot contain specialChar but could be not a string
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path.push(('' + key).replace(specialCharRG, safeSpecialChar));
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mapp[i] = specialChar + path.join(specialChar);
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} else {
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mapp[i] = mapp[0];
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}
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} else {
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value = mapp[i];
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}
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} else {
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if (typeof value === 'string' && resolve) {
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// ensure no special char involved on deserialization
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// in this case only first char is important
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// no need to replace all value (better performance)
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value = value .replace(safeSpecialChar, escapedSafeSpecialChar)
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.replace(specialChar, safeSpecialChar);
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}
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}
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}
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return value;
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};
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}
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function retrieveFromPath(current, keys) {
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for(var i = 0, length = keys.length; i < length; current = current[
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// keys should be normalized back here
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keys[i++].replace(safeSpecialCharRG, specialChar)
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]);
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return current;
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}
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function generateReviver(reviver) {
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return function(key, value) {
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var isString = typeof value === 'string';
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if (isString && value.charAt(0) === specialChar) {
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return new $String(value.slice(1));
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}
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if (key === '') value = regenerate(value, value, {});
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// again, only one needed, do not use the RegExp for this replacement
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// only keys need the RegExp
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if (isString) value = value .replace(safeStartWithSpecialCharRG, '$1' + specialChar)
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.replace(escapedSafeSpecialChar, safeSpecialChar);
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return reviver ? reviver.call(this, key, value) : value;
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};
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}
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function regenerateArray(root, current, retrieve) {
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for (var i = 0, length = current.length; i < length; i++) {
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current[i] = regenerate(root, current[i], retrieve);
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}
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return current;
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}
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function regenerateObject(root, current, retrieve) {
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for (var key in current) {
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if (current.hasOwnProperty(key)) {
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current[key] = regenerate(root, current[key], retrieve);
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}
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}
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return current;
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}
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function regenerate(root, current, retrieve) {
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return current instanceof Array ?
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// fast Array reconstruction
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regenerateArray(root, current, retrieve) :
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(
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current instanceof $String ?
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(
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// root is an empty string
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current.length ?
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(
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retrieve.hasOwnProperty(current) ?
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retrieve[current] :
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retrieve[current] = retrieveFromPath(
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root, current.split(specialChar)
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)
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) :
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root
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) :
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(
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current instanceof Object ?
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// dedicated Object parser
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regenerateObject(root, current, retrieve) :
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// value as it is
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current
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)
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)
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;
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}
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function stringifyRecursion(value, replacer, space, doNotResolve) {
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return JSON.stringify(value, generateReplacer(value, replacer, !doNotResolve), space);
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}
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function parseRecursion(text, reviver) {
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return JSON.parse(text, generateReviver(reviver));
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}
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this.stringify = stringifyRecursion;
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this.parse = parseRecursion;
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