379 lines
11 KiB
JavaScript
379 lines
11 KiB
JavaScript
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var Uni = require('./unicode')
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// Fix Function#name on browsers that do not support it (IE)
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// http://stackoverflow.com/questions/6903762/function-name-not-supported-in-ie
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if (!(function f(){}).name) {
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Object.defineProperty((function(){}).constructor.prototype, 'name', {
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get: function() {
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var name = this.toString().match(/^\s*function\s*(\S*)\s*\(/)[1]
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// For better performance only parse once, and then cache the
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// result through a new accessor for repeated access.
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Object.defineProperty(this, 'name', { value: name })
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return name
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}
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})
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}
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var special_chars = {
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0: '\\0', // this is not an octal literal
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8: '\\b',
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9: '\\t',
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10: '\\n',
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11: '\\v',
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12: '\\f',
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13: '\\r',
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92: '\\\\',
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}
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// for oddballs
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var hasOwnProperty = Object.prototype.hasOwnProperty
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// some people escape those, so I'd copy this to be safe
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var escapable = /[\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/
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function _stringify(object, options, recursiveLvl, currentKey) {
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var json5 = (options.mode === 'json5' || !options.mode)
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/*
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* Opinionated decision warning:
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*
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* Objects are serialized in the following form:
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* { type: 'Class', data: DATA }
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*
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* Class is supposed to be a function, and new Class(DATA) is
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* supposed to be equivalent to the original value
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*/
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/*function custom_type() {
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return stringify({
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type: object.constructor.name,
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data: object.toString()
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})
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}*/
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// if add, it's an internal indentation, so we add 1 level and a eol
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// if !add, it's an ending indentation, so we just indent
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function indent(str, add) {
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var prefix = options._prefix ? options._prefix : ''
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if (!options.indent) return prefix + str
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var result = ''
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var count = recursiveLvl + (add || 0)
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for (var i=0; i<count; i++) result += options.indent
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return prefix + result + str + (add ? '\n' : '')
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}
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function _stringify_key(key) {
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if (options.quote_keys) return _stringify_str(key)
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if (String(Number(key)) == key && key[0] != '-') return key
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if (key == '') return _stringify_str(key)
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var result = ''
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for (var i=0; i<key.length; i++) {
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if (i > 0) {
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if (!Uni.isIdentifierPart(key[i]))
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return _stringify_str(key)
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} else {
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if (!Uni.isIdentifierStart(key[i]))
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return _stringify_str(key)
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}
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var chr = key.charCodeAt(i)
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if (options.ascii) {
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if (chr < 0x80) {
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result += key[i]
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} else {
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result += '\\u' + ('0000' + chr.toString(16)).slice(-4)
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}
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} else {
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if (escapable.exec(key[i])) {
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result += '\\u' + ('0000' + chr.toString(16)).slice(-4)
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} else {
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result += key[i]
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}
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}
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}
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return result
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}
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function _stringify_str(key) {
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var quote = options.quote
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var quoteChr = quote.charCodeAt(0)
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var result = ''
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for (var i=0; i<key.length; i++) {
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var chr = key.charCodeAt(i)
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if (chr < 0x10) {
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if (chr === 0 && json5) {
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result += '\\0'
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} else if (chr >= 8 && chr <= 13 && (json5 || chr !== 11)) {
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result += special_chars[chr]
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} else if (json5) {
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result += '\\x0' + chr.toString(16)
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} else {
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result += '\\u000' + chr.toString(16)
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}
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} else if (chr < 0x20) {
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if (json5) {
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result += '\\x' + chr.toString(16)
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} else {
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result += '\\u00' + chr.toString(16)
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}
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} else if (chr >= 0x20 && chr < 0x80) {
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// ascii range
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if (chr === 47 && i && key[i-1] === '<') {
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// escaping slashes in </script>
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result += '\\' + key[i]
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} else if (chr === 92) {
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result += '\\\\'
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} else if (chr === quoteChr) {
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result += '\\' + quote
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} else {
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result += key[i]
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}
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} else if (options.ascii || Uni.isLineTerminator(key[i]) || escapable.exec(key[i])) {
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if (chr < 0x100) {
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if (json5) {
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result += '\\x' + chr.toString(16)
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} else {
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result += '\\u00' + chr.toString(16)
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}
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} else if (chr < 0x1000) {
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result += '\\u0' + chr.toString(16)
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} else if (chr < 0x10000) {
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result += '\\u' + chr.toString(16)
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} else {
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throw Error('weird codepoint')
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}
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} else {
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result += key[i]
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}
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}
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return quote + result + quote
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}
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function _stringify_object() {
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if (object === null) return 'null'
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var result = []
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, len = 0
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, braces
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if (Array.isArray(object)) {
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braces = '[]'
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for (var i=0; i<object.length; i++) {
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var s = _stringify(object[i], options, recursiveLvl+1, String(i))
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if (s === undefined) s = 'null'
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len += s.length + 2
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result.push(s + ',')
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}
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} else {
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braces = '{}'
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var fn = function(key) {
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var t = _stringify(object[key], options, recursiveLvl+1, key)
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if (t !== undefined) {
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t = _stringify_key(key) + ':' + (options.indent ? ' ' : '') + t + ','
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len += t.length + 1
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result.push(t)
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}
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}
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if (Array.isArray(options.replacer)) {
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for (var i=0; i<options.replacer.length; i++)
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if (hasOwnProperty.call(object, options.replacer[i]))
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fn(options.replacer[i])
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} else {
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var keys = Object.keys(object)
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if (options.sort_keys)
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keys = keys.sort(typeof(options.sort_keys) === 'function'
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? options.sort_keys : undefined)
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keys.forEach(fn)
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}
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}
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// objects shorter than 30 characters are always inlined
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// objects longer than 60 characters are always splitted to multiple lines
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// anything in the middle depends on indentation level
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len -= 2
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if (options.indent && (len > options._splitMax - recursiveLvl * options.indent.length || len > options._splitMin) ) {
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// remove trailing comma in multiline if asked to
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if (options.no_trailing_comma && result.length) {
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result[result.length-1] = result[result.length-1].substring(0, result[result.length-1].length-1)
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}
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var innerStuff = result.map(function(x) {return indent(x, 1)}).join('')
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return braces[0]
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+ (options.indent ? '\n' : '')
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+ innerStuff
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+ indent(braces[1])
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} else {
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// always remove trailing comma in one-lined arrays
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if (result.length) {
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result[result.length-1] = result[result.length-1].substring(0, result[result.length-1].length-1)
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}
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var innerStuff = result.join(options.indent ? ' ' : '')
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return braces[0]
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+ innerStuff
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+ braces[1]
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}
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}
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function _stringify_nonobject(object) {
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if (typeof(options.replacer) === 'function') {
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object = options.replacer.call(null, currentKey, object)
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}
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switch(typeof(object)) {
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case 'string':
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return _stringify_str(object)
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case 'number':
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if (object === 0 && 1/object < 0) {
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// Opinionated decision warning:
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//
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// I want cross-platform negative zero in all js engines
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// I know they're equal, but why lose that tiny bit of
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// information needlessly?
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return '-0'
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}
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if (!json5 && !Number.isFinite(object)) {
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// json don't support infinity (= sucks)
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return 'null'
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}
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return object.toString()
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case 'boolean':
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return object.toString()
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case 'undefined':
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return undefined
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case 'function':
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// return custom_type()
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default:
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// fallback for something weird
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return JSON.stringify(object)
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}
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}
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if (options._stringify_key) {
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return _stringify_key(object)
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}
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if (typeof(object) === 'object') {
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if (object === null) return 'null'
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var str
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if (typeof(str = object.toJSON5) === 'function' && options.mode !== 'json') {
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object = str.call(object, currentKey)
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} else if (typeof(str = object.toJSON) === 'function') {
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object = str.call(object, currentKey)
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}
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if (object === null) return 'null'
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if (typeof(object) !== 'object') return _stringify_nonobject(object)
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if (object.constructor === Number || object.constructor === Boolean || object.constructor === String) {
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object = object.valueOf()
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return _stringify_nonobject(object)
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} else if (object.constructor === Date) {
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// only until we can't do better
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return _stringify_nonobject(object.toISOString())
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} else {
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if (typeof(options.replacer) === 'function') {
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object = options.replacer.call(null, currentKey, object)
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if (typeof(object) !== 'object') return _stringify_nonobject(object)
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}
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return _stringify_object(object)
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}
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} else {
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return _stringify_nonobject(object)
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}
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}
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/*
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* stringify(value, options)
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* or
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* stringify(value, replacer, space)
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*
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* where:
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* value - anything
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* options - object
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* replacer - function or array
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* space - boolean or number or string
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*/
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module.exports.stringify = function stringifyJSON(object, options, _space) {
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// support legacy syntax
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if (typeof(options) === 'function' || Array.isArray(options)) {
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options = {
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replacer: options
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}
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} else if (typeof(options) === 'object' && options !== null) {
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// nothing to do
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} else {
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options = {}
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}
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if (_space != null) options.indent = _space
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if (options.indent == null) options.indent = '\t'
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if (options.quote == null) options.quote = "'"
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if (options.ascii == null) options.ascii = false
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if (options.mode == null) options.mode = 'json5'
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if (options.mode === 'json' || options.mode === 'cjson') {
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// json only supports double quotes (= sucks)
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options.quote = '"'
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// json don't support trailing commas (= sucks)
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options.no_trailing_comma = true
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// json don't support unquoted property names (= sucks)
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options.quote_keys = true
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}
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// why would anyone use such objects?
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if (typeof(options.indent) === 'object') {
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if (options.indent.constructor === Number
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|| options.indent.constructor === Boolean
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|| options.indent.constructor === String)
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options.indent = options.indent.valueOf()
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}
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// gap is capped at 10 characters
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if (typeof(options.indent) === 'number') {
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if (options.indent >= 0) {
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options.indent = Array(Math.min(~~options.indent, 10) + 1).join(' ')
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} else {
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options.indent = false
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}
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} else if (typeof(options.indent) === 'string') {
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options.indent = options.indent.substr(0, 10)
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}
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if (options._splitMin == null) options._splitMin = 50
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if (options._splitMax == null) options._splitMax = 70
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return _stringify(object, options, 0, '')
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}
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