mirror of https://gitee.com/antv-l7/antv-l7
61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
'use strict';
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var keyList = Object.keys;
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var native_stringify = JSON.stringify;
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function stringify(val, allowUndefined) {
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var i, max, str, keys, key, propVal, tipeof;
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tipeof = typeof val;
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if (tipeof === 'string') return native_stringify(val);
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if (val === true) return 'true';
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if (val === false) return 'false';
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if (val === null) return 'null';
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if (val instanceof Array) {
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str = '[';
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max = val.length - 1;
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for(i = 0; i < max; i++)
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str += stringify(val[i], false) + ',';
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if (max > -1) {
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str += stringify(val[i], false);
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}
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return str + ']';
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}
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if (val instanceof Object) {
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if (typeof val.toJSON === 'function')
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return stringify(val.toJSON(), allowUndefined);
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// only object is left
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keys = keyList(val).sort();
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max = keys.length;
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str = '';
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i = 0;
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while (i < max) {
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key = keys[i];
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propVal = stringify(val[key], true);
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if (propVal !== undefined) {
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if (i) {
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str += ',';
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}
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str += native_stringify(key) + ':' + propVal;
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}
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i++;
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}
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return '{' + str + '}';
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}
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switch (tipeof) {
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case 'function':
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case 'undefined':
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return allowUndefined ? undefined : null;
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default:
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return isFinite(val) ? val : null;
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}
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}
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module.exports = function(obj) { return '' + stringify(obj, false); };
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