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update repr

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Sami Samhuri 2011-05-29 23:47:10 -07:00
parent f03c8084d7
commit 6ca19ad0cd
1 changed files with 34 additions and 21 deletions
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35
lib/repr.js
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@ -2,32 +2,45 @@
// Copyright 2010 - 2011 Sami Samhuri <sami@samhuri.net>
// readable string representations of values
exports.repr = function(x) {
exports.repr = repr;
function repr(x) {
if (x !== null && x !== undefined && typeof x.repr === 'function') return x.repr();
if (x === null || x === undefined ||
x instanceof Number || typeof x === 'number' ||
x instanceof Boolean || typeof x === 'boolean' ||
x instanceof RegExp || x.constructor === RegExp)
{
var nativeToStringIsReadable =
x === null
|| x === undefined
|| x instanceof Number
|| typeof x === 'number'
|| x instanceof Boolean
|| typeof x === 'boolean'
|| x instanceof RegExp
|| x.constructor === RegExp;
if (nativeToStringIsReadable) {
return String(x);
}
if (x instanceof String || typeof x === 'string')
if (x instanceof String || typeof x === 'string') {
return '"' + x.replace(/"/g, '\\"') + '"';
}
if (x instanceof Date || x.toUTCString)
if (x instanceof Date || x.toUTCString) {
return 'new Date(' + (+x) + ')'; // lame
}
if (Array.isArray(x))
if (Array.isArray(x)) {
return '[' + x.map(repr).join(',') + ']';
}
if (x instanceof Function || typeof x === 'function')
if (x instanceof Function || typeof x === 'function') {
return x.toString();
}
// TODO determine how far to go with this. should we include non-enumerable props too?
if (x instanceof Object || typeof x === 'object')
if (x instanceof Object || typeof x === 'object') {
return '{' + Object.keys(x).map(function(k) { return repr(k) + ':' + repr(x[k]); }).join(',') + '}';
}
throw new Error("don't know how to represent " + x);
};