aaac7fed
 liuqimichale
add
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'use strict'
function isArguments (thingy) {
return thingy != null && typeof thingy === 'object' && thingy.hasOwnProperty('callee')
}
var types = {
'*': {label: 'any', check: function () { return true }},
A: {label: 'array', check: function (thingy) { return Array.isArray(thingy) || isArguments(thingy) }},
S: {label: 'string', check: function (thingy) { return typeof thingy === 'string' }},
N: {label: 'number', check: function (thingy) { return typeof thingy === 'number' }},
F: {label: 'function', check: function (thingy) { return typeof thingy === 'function' }},
O: {label: 'object', check: function (thingy) { return typeof thingy === 'object' && thingy != null && !types.A.check(thingy) && !types.E.check(thingy) }},
B: {label: 'boolean', check: function (thingy) { return typeof thingy === 'boolean' }},
E: {label: 'error', check: function (thingy) { return thingy instanceof Error }},
Z: {label: 'null', check: function (thingy) { return thingy == null }}
}
function addSchema (schema, arity) {
var group = arity[schema.length] = arity[schema.length] || []
if (group.indexOf(schema) === -1) group.push(schema)
}
var validate = module.exports = function (rawSchemas, args) {
if (arguments.length !== 2) throw wrongNumberOfArgs(['SA'], arguments.length)
if (!rawSchemas) throw missingRequiredArg(0, 'rawSchemas')
if (!args) throw missingRequiredArg(1, 'args')
if (!types.S.check(rawSchemas)) throw invalidType(0, ['string'], rawSchemas)
if (!types.A.check(args)) throw invalidType(1, ['array'], args)
var schemas = rawSchemas.split('|')
var arity = {}
schemas.forEach(function (schema) {
for (var ii = 0; ii < schema.length; ++ii) {
var type = schema[ii]
if (!types[type]) throw unknownType(ii, type)
}
if (/E.*E/.test(schema)) throw moreThanOneError(schema)
addSchema(schema, arity)
if (/E/.test(schema)) {
addSchema(schema.replace(/E.*$/, 'E'), arity)
addSchema(schema.replace(/E/, 'Z'), arity)
if (schema.length === 1) addSchema('', arity)
}
})
var matching = arity[args.length]
if (!matching) {
throw wrongNumberOfArgs(Object.keys(arity), args.length)
}
for (var ii = 0; ii < args.length; ++ii) {
var newMatching = matching.filter(function (schema) {
var type = schema[ii]
var typeCheck = types[type].check
return typeCheck(args[ii])
})
if (!newMatching.length) {
var labels = matching.map(function (schema) {
return types[schema[ii]].label
}).filter(function (schema) { return schema != null })
throw invalidType(ii, labels, args[ii])
}
matching = newMatching
}
}
function missingRequiredArg (num) {
return newException('EMISSINGARG', 'Missing required argument #' + (num + 1))
}
function unknownType (num, type) {
return newException('EUNKNOWNTYPE', 'Unknown type ' + type + ' in argument #' + (num + 1))
}
function invalidType (num, expectedTypes, value) {
var valueType
Object.keys(types).forEach(function (typeCode) {
if (types[typeCode].check(value)) valueType = types[typeCode].label
})
return newException('EINVALIDTYPE', 'Argument #' + (num + 1) + ': Expected ' +
englishList(expectedTypes) + ' but got ' + valueType)
}
function englishList (list) {
return list.join(', ').replace(/, ([^,]+)$/, ' or $1')
}
function wrongNumberOfArgs (expected, got) {
var english = englishList(expected)
var args = expected.every(function (ex) { return ex.length === 1 })
? 'argument'
: 'arguments'
return newException('EWRONGARGCOUNT', 'Expected ' + english + ' ' + args + ' but got ' + got)
}
function moreThanOneError (schema) {
return newException('ETOOMANYERRORTYPES',
'Only one error type per argument signature is allowed, more than one found in "' + schema + '"')
}
function newException (code, msg) {
var e = new Error(msg)
e.code = code
if (Error.captureStackTrace) Error.captureStackTrace(e, validate)
return e
}
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