You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
3.6 KiB
106 lines
3.6 KiB
'use strict'
|
|
module.exports = validate
|
|
|
|
function isArguments (thingy) {
|
|
return thingy != null && typeof thingy === 'object' && thingy.hasOwnProperty('callee')
|
|
}
|
|
|
|
const types = {
|
|
'*': {label: 'any', check: () => true},
|
|
A: {label: 'array', check: _ => Array.isArray(_) || isArguments(_)},
|
|
S: {label: 'string', check: _ => typeof _ === 'string'},
|
|
N: {label: 'number', check: _ => typeof _ === 'number'},
|
|
F: {label: 'function', check: _ => typeof _ === 'function'},
|
|
O: {label: 'object', check: _ => typeof _ === 'object' && _ != null && !types.A.check(_) && !types.E.check(_)},
|
|
B: {label: 'boolean', check: _ => typeof _ === 'boolean'},
|
|
E: {label: 'error', check: _ => _ instanceof Error},
|
|
Z: {label: 'null', check: _ => _ == null}
|
|
}
|
|
|
|
function addSchema (schema, arity) {
|
|
const group = arity[schema.length] = arity[schema.length] || []
|
|
if (group.indexOf(schema) === -1) group.push(schema)
|
|
}
|
|
|
|
function validate (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)
|
|
const schemas = rawSchemas.split('|')
|
|
const arity = {}
|
|
|
|
schemas.forEach(schema => {
|
|
for (let ii = 0; ii < schema.length; ++ii) {
|
|
const 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.*$/, 'E'), arity)
|
|
addSchema(schema.replace(/E/, 'Z'), arity)
|
|
if (schema.length === 1) addSchema('', arity)
|
|
}
|
|
})
|
|
let matching = arity[args.length]
|
|
if (!matching) {
|
|
throw wrongNumberOfArgs(Object.keys(arity), args.length)
|
|
}
|
|
for (let ii = 0; ii < args.length; ++ii) {
|
|
let newMatching = matching.filter(schema => {
|
|
const type = schema[ii]
|
|
const typeCheck = types[type].check
|
|
return typeCheck(args[ii])
|
|
})
|
|
if (!newMatching.length) {
|
|
const labels = matching.map(_ => types[_[ii]].label).filter(_ => _ != null)
|
|
throw invalidType(ii, labels, args[ii])
|
|
}
|
|
matching = newMatching
|
|
}
|
|
}
|
|
|
|
function missingRequiredArg (num) {
|
|
return newException('EMISSINGARG', 'Missing required argument #' + (num + 1))
|
|
}
|
|
|
|
function unknownType (num, type) {
|
|
return newException('EUNKNOWNTYPE', 'Unknown type ' + type + ' in argument #' + (num + 1))
|
|
}
|
|
|
|
function invalidType (num, expectedTypes, value) {
|
|
let valueType
|
|
Object.keys(types).forEach(typeCode => {
|
|
if (types[typeCode].check(value)) valueType = types[typeCode].label
|
|
})
|
|
return newException('EINVALIDTYPE', 'Argument #' + (num + 1) + ': Expected ' +
|
|
englishList(expectedTypes) + ' but got ' + valueType)
|
|
}
|
|
|
|
function englishList (list) {
|
|
return list.join(', ').replace(/, ([^,]+)$/, ' or $1')
|
|
}
|
|
|
|
function wrongNumberOfArgs (expected, got) {
|
|
const english = englishList(expected)
|
|
const args = expected.every(ex => 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) {
|
|
const err = new Error(msg)
|
|
err.code = code
|
|
/* istanbul ignore else */
|
|
if (Error.captureStackTrace) Error.captureStackTrace(err, validate)
|
|
return err
|
|
}
|