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