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Filename :
index.js
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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 }