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- 'use strict'
- function isArguments (thingy) {
- return typeof thingy === 'object' && thingy.hasOwnProperty('callee')
- }
- var types = {
- '*': ['any', function () { return true }],
- A: ['array', function (thingy) { return Array.isArray(thingy) || isArguments(thingy) }],
- S: ['string', function (thingy) { return typeof thingy === 'string' }],
- N: ['number', function (thingy) { return typeof thingy === 'number' }],
- F: ['function', function (thingy) { return typeof thingy === 'function' }],
- O: ['object', function (thingy) { return typeof thingy === 'object' && !types.A[1](thingy) && !types.E[1](thingy) }],
- B: ['boolean', function (thingy) { return typeof thingy === 'boolean' }],
- E: ['error', function (thingy) { return thingy instanceof Error }]
- }
- var validate = module.exports = function (schema, args) {
- if (!schema) throw missingRequiredArg(0, 'schema')
- if (!args) throw missingRequiredArg(1, 'args')
- if (!types.S[1](schema)) throw invalidType(0, 'string', schema)
- if (!types.A[1](args)) throw invalidType(1, 'array', args)
- for (var ii = 0; ii < schema.length; ++ii) {
- var type = schema[ii]
- if (!types[type]) throw unknownType(ii, type)
- var typeLabel = types[type][0]
- var typeCheck = types[type][1]
- if (type === 'E' && args[ii] == null) continue
- if (args[ii] == null) throw missingRequiredArg(ii)
- if (!typeCheck(args[ii])) throw invalidType(ii, typeLabel, args[ii])
- if (type === 'E') return
- }
- if (schema.length < args.length) throw tooManyArgs(schema.length, args.length)
- }
- function missingRequiredArg (num) {
- return newException('EMISSINGARG', 'Missing required argument #' + (num + 1))
- }
- function unknownType (num, type) {
- return newException('EUNKNOWNTYPE', 'Unknown type ' + type + ' in argument #' + (num + 1))
- }
- function invalidType (num, expectedType, value) {
- var valueType
- Object.keys(types).forEach(function (typeCode) {
- if (types[typeCode][1](value)) valueType = types[typeCode][0]
- })
- return newException('EINVALIDTYPE', 'Argument #' + (num + 1) + ': Expected ' +
- expectedType + ' but got ' + valueType)
- }
- function tooManyArgs (expected, got) {
- return newException('ETOOMANYARGS', 'Too many arguments, expected ' + expected + ' and got ' + got)
- }
- function newException (code, msg) {
- var e = new Error(msg)
- e.code = code
- Error.captureStackTrace(e, validate)
- return e
- }
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