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stringify.js
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stringify.js
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'use strict'
var ObjectID = require('mongodb').ObjectID,
Binary = require('mongodb').Binary
/**
* @param {*} value
* @param {boolean} [useColors=false]
* @param {string} [highlightPath]
* @returns {string}
*/
module.exports = function (value, useColors, highlightPath) {
var finalStr = '',
indentLevel = 0,
highlight = false
var hasBreak = true
var getNL = function () {
var i, nl = useColors && highlight ? '\x1b[0m\n\x1b[41m' : '\n'
for (i = 0; i < indentLevel; i++) {
nl += ' '
}
return nl
}
var escapeKey = function (key) {
if (key.match(/^[a-z_$][a-z_$0-9]*$/i)) {
return key
} else {
return '"' + key.replace(/"/g, '\\"') + '"'
}
}
var pushStr = function (str, breakBefore, breakAfter, color) {
if (!hasBreak && breakBefore) {
finalStr += getNL()
}
if (color && useColors) {
finalStr += '\x1b[3' + color + 'm' + str + '\x1b[37m'
} else {
finalStr += str
}
if (breakAfter) {
finalStr += getNL()
}
hasBreak = breakAfter
}
var colors = {
key: '4;1',
number: '3;1',
string: '2',
id: '5;1',
bin: '6;1',
date: '6',
regex: '1;1'
}
var pushJsonValue = function (value, path) {
var needComma, subpath
if (path === highlightPath) {
highlight = true
finalStr += '\x1b[41m'
}
if (value === false) {
pushStr('false', false, false, colors.key)
} else if (value === true) {
pushStr('true', false, false, colors.key)
} else if (value === undefined) {
pushStr('undefined', false, false, colors.key)
} else if (value === null) {
pushStr('null', false, false, colors.key)
} else if (typeof value === 'number') {
pushStr(String(value), false, false, colors.number)
} else if (typeof value === 'string') {
pushStr('\'' + value.replace(/'/g, '\\\'') + '\'', false, false, colors.string)
} else if (Array.isArray(value) && !value.length) {
pushStr('[]')
} else if (Array.isArray(value)) {
indentLevel++
pushStr('[', false, true)
value.forEach(function (value, i) {
var subpath = path ? path + '.' + i : String(i)
if (i) {
pushStr(',', false, true)
}
pushJsonValue(value, subpath)
})
indentLevel--
pushStr(']', true)
} else if (value instanceof ObjectID) {
pushStr(value.toString(), false, false, colors.id)
} else if (value instanceof Binary) {
pushStr(value.toString('base64'), false, false, colors.bin)
} else if (value instanceof Date) {
pushStr(value.toISOString(), false, false, colors.date)
} else if (value instanceof RegExp) {
pushStr(String(value), false, false, colors.regex)
} else if (typeof value === 'function') {
pushStr(value.name || String(value), false, false)
} else if (!Object.keys(value).length) {
pushStr('{}')
} else {
indentLevel++
pushStr('{', false, true)
needComma = false
Object.keys(value).sort().forEach(function (key) {
if (!needComma) {
needComma = true
} else {
pushStr(',', false, true)
}
subpath = path ? path + '.' + key : key
pushStr(escapeKey(key), false, false, colors.key)
pushStr(': ')
pushJsonValue(value[key], subpath)
})
indentLevel--
pushStr('}', true)
}
if (path === highlightPath) {
highlight = false
finalStr += '\x1b[0m'
}
}
pushJsonValue(value, '')
return finalStr
}