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easy-types.js
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easy-types.js
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/*
MIT license
*/
'use strict';
module.exports.addTypes = addTypes;
var types = {
posInt: function(i) {
return ((typeof i === 'number') && (i % 1 === 0) && (i >= 0));
},
int: function(i) {
return ((typeof i === 'number') && (i % 1 === 0));
},
date: function(d) {
return Object.prototype.toString.call(d) === '[object Date]';
},
array: function(a) {
return Array.isArray(a);
},
null: function(e) {
return e === null;
},
object: function(obj) {
return typeof obj === 'object';
},
buffer: function(b) {
return Buffer.isBuffer(b);
}
}
function pretty(obj) {
return JSON.stringify(obj, null, ' ');
}
function is(obj, req) {
switch (typeof req) {
// Check for constructor, or arbitrary function to apply to obj
case 'function':
if (obj instanceof req) { return; }
if (!req(obj)) throw (pretty(obj) + ' failed ' + req);
break;
case 'string':
// optional types
var optReq = req.charAt(req.length - 1) === '?' ?
req.slice(0, -1) :
undefined;
// success if optional type and undefined value
if (optReq) {
if (obj === undefined) return;
req = optReq;
}
// user defined types
if (userTypes[req]) {
is(obj, userTypes[req]);
}
// default types
else if (types[req]) {
if (! types[req](obj)) {
throw pretty(obj)+' should be a ' + pretty(req);
}
}
// arrays : "[type]"
else if (req.charAt(0) === '[' && req.charAt(req.length-1) === ']') {
if (req.length === 2) throw 'Empty type array, should be "[type]".';
var typeName = req.slice(1, -1);
var type = userTypes[typeName] || types[typeName];
// optional type arrays
var optTypeName;
if (!type && typeName.charAt(typeName.length - 1) === '?') {
optTypeName = typeName.slice(0, -1);
type = userTypes[optTypeName] || types[optTypeName];
}
if (!type) throw 'Nonexistent type, '+typeName;
if (!Array.isArray(obj)) {
throw pretty(obj)+' should be an array of '+typeName;
}
if (obj.length === 0) {
return;
}
for (var i = 0; i < obj.length; i++) {
if (optTypeName && obj[i] === undefined) continue;
is(obj[i], type)
}
}
// primitive types : [boolean, number, undefined, string, object]
else if (typeof(obj) !== req) {
throw pretty(obj) + ' should be a(n) '+req;
}
break;
case 'object':
if (typeof obj !== 'object') throw pretty(obj)+' should be an object';
if (obj === null) throw pretty(obj)+' is not of type '+pretty(req);
// {} case
for(var e in req) {
if (!obj.hasOwnProperty(e) &&
req[e].charAt(req[e].length - 1) !== '?') {
throw pretty(obj)+' does not contain field '+e+
' for requirement '+pretty(req);
}
is(obj[e], req[e]);
}
break;
default:
throw 'Not a valid requirement: '+pretty(req) +' for '+ pretty(obj);
}
}
var userTypes = {};
function addTypes(obj) {
userTypes = obj;
return module.exports
}
module.exports = function(obj) {
return {
is: function(req){
try {
is(obj, req)
} catch(e) {
console.trace()
throw '{'+pretty(obj)+'} Fails to meet {'+pretty(req)+'}\nBecause ' + e
}
return true
}
}
}
module.exports.prototype.addTypes = function(obj) {
addTypes(obj)
}