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					106 lines
				
				3.9 KiB
			
		
		
			
		
	
	
					106 lines
				
				3.9 KiB
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											4 years ago
										 
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								'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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