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105 lines
3.9 KiB
105 lines
3.9 KiB
'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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