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PK!úཅ¨¨ CHANGELOG.mdnu„[µü¤2.0.0 * Drop support for 0.10 and 0.12. They haven't been in travis but still, since we _know_ we'll break with them now it's only polite to do a major bump. PK!Õ„Äü· · README.mdnu„[µü¤aproba ====== A ridiculously light-weight function argument validator ``` var validate = require("aproba") function myfunc(a, b, c) { // `a` must be a string, `b` a number, `c` a function validate('SNF', arguments) // [a,b,c] is also valid } myfunc('test', 23, function () {}) // ok myfunc(123, 23, function () {}) // type error myfunc('test', 23) // missing arg error myfunc('test', 23, function () {}, true) // too many args error ``` Valid types are: | type | description | :--: | :---------- | * | matches any type | A | `Array.isArray` OR an `arguments` object | S | typeof == string | N | typeof == number | F | typeof == function | O | typeof == object and not type A and not type E | B | typeof == boolean | E | `instanceof Error` OR `null` **(special: see below)** | Z | == `null` Validation failures throw one of three exception types, distinguished by a `code` property of `EMISSINGARG`, `EINVALIDTYPE` or `ETOOMANYARGS`. If you pass in an invalid type then it will throw with a code of `EUNKNOWNTYPE`. If an **error** argument is found and is not null then the remaining arguments are optional. That is, if you say `ESO` then that's like using a non-magical `E` in: `E|ESO|ZSO`. ### But I have optional arguments?! You can provide more than one signature by separating them with pipes `|`. If any signature matches the arguments then they'll be considered valid. So for example, say you wanted to write a signature for `fs.createWriteStream`. The docs for it describe it thusly: ``` fs.createWriteStream(path[, options]) ``` This would be a signature of `SO|S`. That is, a string and and object, or just a string. Now, if you read the full `fs` docs, you'll see that actually path can ALSO be a buffer. And options can be a string, that is: ``` path | options | ``` To reproduce this you have to fully enumerate all of the possible combinations and that implies a signature of `SO|SS|OO|OS|S|O`. The awkwardness is a feature: It reminds you of the complexity you're adding to your API when you do this sort of thing. ### Browser support This has no dependencies and should work in browsers, though you'll have noisier stack traces. ### Why this exists I wanted a very simple argument validator. It needed to do two things: 1. Be more concise and easier to use than assertions 2. Not encourage an infinite bikeshed of DSLs This is why types are specified by a single character and there's no such thing as an optional argument. This is not intended to validate user data. This is specifically about asserting the interface of your functions. If you need greater validation, I encourage you to write them by hand or look elsewhere. PK!ûð'Ù package.jsonnu„[µü¤{ "_from": "aproba@2.0.0", "_id": "aproba@2.0.0", "_inBundle": false, "_integrity": "sha512-lYe4Gx7QT+MKGbDsA+Z+he/Wtef0BiwDOlK/XkBrdfsh9J/jPPXbX0tE9x9cl27Tmu5gg3QUbUrQYa/y+KOHPQ==", "_location": "/aproba", "_phantomChildren": {}, "_requested": { "type": "version", "registry": true, "raw": "aproba@2.0.0", "name": "aproba", "escapedName": "aproba", "rawSpec": "2.0.0", "saveSpec": null, "fetchSpec": "2.0.0" }, "_requiredBy": [ "#USER", "/", "/npm-profile" ], "_resolved": "https://registry.npmjs.org/aproba/-/aproba-2.0.0.tgz", "_shasum": "52520b8ae5b569215b354efc0caa3fe1e45a8adc", "_spec": "aproba@2.0.0", "_where": "/Users/aeschright/code/cli", "author": { "name": "Rebecca Turner", "email": "me@re-becca.org" }, "bugs": { "url": "https://github.com/iarna/aproba/issues" }, "bundleDependencies": false, "dependencies": {}, "deprecated": false, "description": "A ridiculously light-weight argument validator (now browser friendly)", "devDependencies": { "standard": "^11.0.1", "tap": "^12.0.1" }, "directories": { "test": "test" }, "files": [ "index.js" ], "homepage": "https://github.com/iarna/aproba", "keywords": [ "argument", "validate" ], "license": "ISC", "main": "index.js", "name": "aproba", "repository": { "type": "git", "url": "git+https://github.com/iarna/aproba.git" }, "scripts": { "pretest": "standard", "test": "tap --100 -J test/*.js" }, "version": "2.0.0" } PK!Ì>Èý<<index.jsnu„[µü¤'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 } PK!vr«ððLICENSEnu„[µü¤Copyright (c) 2015, Rebecca Turner Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. PK!úཅ¨¨ CHANGELOG.mdnu„[µü¤PK!Õ„Äü· · äREADME.mdnu„[µü¤PK!ûð'Ù Ô package.jsonnu„[µü¤PK!Ì>Èý<<"index.jsnu„[µü¤PK!vr«ðð– LICENSEnu„[µü¤PKp½#