94 lines
2.4 KiB
JavaScript
94 lines
2.4 KiB
JavaScript
/* Copyright 2015 Mark Haines
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var escaped = /[\\\"\x00-\x1F]/g;
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var escapes = {};
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for (var i = 0; i < 0x20; ++i) {
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escapes[String.fromCharCode(i)] = (
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'\\U' + ('0000' + i.toString(16)).slice(-4).toUpperCase()
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);
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}
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escapes['\b'] = '\\b';
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escapes['\t'] = '\\t';
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escapes['\n'] = '\\n';
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escapes['\f'] = '\\f';
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escapes['\r'] = '\\r';
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escapes['\"'] = '\\\"';
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escapes['\\'] = '\\\\';
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function escapeString(value) {
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escaped.lastIndex = 0;
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return value.replace(escaped, function(c) { return escapes[c]; });
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}
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function stringify(value) {
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switch (typeof value) {
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case 'string':
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return '"' + escapeString(value) + '"';
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case 'number':
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return isFinite(value) ? value : 'null';
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case 'boolean':
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return value;
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case 'object':
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if (value === null) {
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return 'null';
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}
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if (Array.isArray(value)) {
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return stringifyArray(value);
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}
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return stringifyObject(value);
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default:
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throw new Error('Cannot stringify: ' + typeof value);
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}
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}
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function stringifyArray(array) {
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var sep = '[';
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var result = '';
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for (var i = 0; i < array.length; ++i) {
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result += sep;
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sep = ',';
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result += stringify(array[i]);
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}
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if (sep != ',') {
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return '[]';
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} else {
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return result + ']';
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}
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}
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function stringifyObject(object) {
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var sep = '{';
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var result = '';
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var keys = Object.keys(object);
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keys.sort();
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for (var i = 0; i < keys.length; ++i) {
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var key = keys[i];
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result += sep + '"' + escapeString(key) + '":';
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sep = ',';
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result += stringify(object[key]);
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}
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if (sep != ',') {
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return '{}';
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} else {
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return result + '}';
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}
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}
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/** */
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module.exports = {stringify: stringify};
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