'use strict';
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const isRegexp = require('is-regexp');
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const isObj = require('is-obj');
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const getOwnEnumPropSymbols = require('get-own-enumerable-property-symbols').default;
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module.exports = (val, opts, pad) => {
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const seen = [];
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return (function stringify(val, opts, pad) {
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opts = opts || {};
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opts.indent = opts.indent || '\t';
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pad = pad || '';
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let tokens;
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if (opts.inlineCharacterLimit === undefined) {
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tokens = {
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newLine: '\n',
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newLineOrSpace: '\n',
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pad,
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indent: pad + opts.indent
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};
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} else {
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tokens = {
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newLine: '@@__STRINGIFY_OBJECT_NEW_LINE__@@',
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newLineOrSpace: '@@__STRINGIFY_OBJECT_NEW_LINE_OR_SPACE__@@',
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pad: '@@__STRINGIFY_OBJECT_PAD__@@',
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indent: '@@__STRINGIFY_OBJECT_INDENT__@@'
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};
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}
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const expandWhiteSpace = string => {
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if (opts.inlineCharacterLimit === undefined) {
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return string;
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}
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const oneLined = string
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.replace(new RegExp(tokens.newLine, 'g'), '')
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.replace(new RegExp(tokens.newLineOrSpace, 'g'), ' ')
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.replace(new RegExp(tokens.pad + '|' + tokens.indent, 'g'), '');
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if (oneLined.length <= opts.inlineCharacterLimit) {
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return oneLined;
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}
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return string
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.replace(new RegExp(tokens.newLine + '|' + tokens.newLineOrSpace, 'g'), '\n')
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.replace(new RegExp(tokens.pad, 'g'), pad)
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.replace(new RegExp(tokens.indent, 'g'), pad + opts.indent);
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};
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if (seen.indexOf(val) !== -1) {
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return '"[Circular]"';
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}
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if (val === null ||
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val === undefined ||
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typeof val === 'number' ||
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typeof val === 'boolean' ||
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typeof val === 'function' ||
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typeof val === 'symbol' ||
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isRegexp(val)) {
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return String(val);
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}
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if (val instanceof Date) {
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return `new Date('${val.toISOString()}')`;
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}
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if (Array.isArray(val)) {
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if (val.length === 0) {
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return '[]';
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}
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seen.push(val);
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const ret = '[' + tokens.newLine + val.map((el, i) => {
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const eol = val.length - 1 === i ? tokens.newLine : ',' + tokens.newLineOrSpace;
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let value = stringify(el, opts, pad + opts.indent);
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if (opts.transform) {
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value = opts.transform(val, i, value);
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}
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return tokens.indent + value + eol;
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}).join('') + tokens.pad + ']';
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seen.pop();
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return expandWhiteSpace(ret);
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}
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if (isObj(val)) {
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let objKeys = Object.keys(val).concat(getOwnEnumPropSymbols(val));
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if (opts.filter) {
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objKeys = objKeys.filter(el => opts.filter(val, el));
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}
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if (objKeys.length === 0) {
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return '{}';
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}
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seen.push(val);
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const ret = '{' + tokens.newLine + objKeys.map((el, i) => {
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const eol = objKeys.length - 1 === i ? tokens.newLine : ',' + tokens.newLineOrSpace;
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const isSymbol = typeof el === 'symbol';
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const isClassic = !isSymbol && /^[a-z$_][a-z$_0-9]*$/i.test(el);
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const key = isSymbol || isClassic ? el : stringify(el, opts);
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let value = stringify(val[el], opts, pad + opts.indent);
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if (opts.transform) {
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value = opts.transform(val, el, value);
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}
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return tokens.indent + String(key) + ': ' + value + eol;
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}).join('') + tokens.pad + '}';
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seen.pop();
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return expandWhiteSpace(ret);
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}
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val = String(val).replace(/[\r\n]/g, x => x === '\n' ? '\\n' : '\\r');
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if (opts.singleQuotes === false) {
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val = val.replace(/"/g, '\\"');
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return `"${val}"`;
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}
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val = val.replace(/\\?'/g, '\\\'');
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return `'${val}'`;
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})(val, opts, pad);
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};
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