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