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110 lines
2.6 KiB
110 lines
2.6 KiB
'use strict'
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function tryStringify (o) {
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try { return JSON.stringify(o) } catch(e) { return '"[Circular]"' }
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}
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module.exports = format
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function format(f, args, opts) {
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var ss = (opts && opts.stringify) || tryStringify
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var offset = 1
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if (typeof f === 'object' && f !== null) {
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var len = args.length + offset
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if (len === 1) return f
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var objects = new Array(len)
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objects[0] = ss(f)
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for (var index = 1; index < len; index++) {
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objects[index] = ss(args[index])
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}
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return objects.join(' ')
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}
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if (typeof f !== 'string') {
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return f
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}
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var argLen = args.length
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if (argLen === 0) return f
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var str = ''
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var a = 1 - offset
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var lastPos = -1
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var flen = (f && f.length) || 0
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for (var i = 0; i < flen;) {
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if (f.charCodeAt(i) === 37 && i + 1 < flen) {
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lastPos = lastPos > -1 ? lastPos : 0
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switch (f.charCodeAt(i + 1)) {
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case 100: // 'd'
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case 102: // 'f'
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if (a >= argLen)
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break
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if (args[a] == null) break
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if (lastPos < i)
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str += f.slice(lastPos, i)
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str += Number(args[a])
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lastPos = i + 2
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i++
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break
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case 105: // 'i'
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if (a >= argLen)
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break
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if (args[a] == null) break
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if (lastPos < i)
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str += f.slice(lastPos, i)
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str += Math.floor(Number(args[a]))
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lastPos = i + 2
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i++
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break
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case 79: // 'O'
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case 111: // 'o'
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case 106: // 'j'
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if (a >= argLen)
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break
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if (args[a] === undefined) break
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if (lastPos < i)
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str += f.slice(lastPos, i)
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var type = typeof args[a]
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if (type === 'string') {
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str += '\'' + args[a] + '\''
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lastPos = i + 2
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i++
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break
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}
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if (type === 'function') {
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str += args[a].name || '<anonymous>'
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lastPos = i + 2
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i++
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break
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}
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str += ss(args[a])
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lastPos = i + 2
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i++
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break
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case 115: // 's'
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if (a >= argLen)
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break
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if (lastPos < i)
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str += f.slice(lastPos, i)
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str += String(args[a])
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lastPos = i + 2
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i++
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break
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case 37: // '%'
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if (lastPos < i)
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str += f.slice(lastPos, i)
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str += '%'
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lastPos = i + 2
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i++
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a--
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break
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}
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++a
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}
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++i
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}
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if (lastPos === -1)
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return f
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else if (lastPos < flen) {
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str += f.slice(lastPos)
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}
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return str
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}
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