diff options
Diffstat (limited to 'node_modules/once')
-rw-r--r-- | node_modules/once/LICENSE | 15 | ||||
-rw-r--r-- | node_modules/once/README.md | 79 | ||||
-rw-r--r-- | node_modules/once/once.js | 42 | ||||
-rw-r--r-- | node_modules/once/package.json | 71 |
4 files changed, 207 insertions, 0 deletions
diff --git a/node_modules/once/LICENSE b/node_modules/once/LICENSE new file mode 100644 index 0000000..19129e3 --- /dev/null +++ b/node_modules/once/LICENSE @@ -0,0 +1,15 @@ +The ISC License + +Copyright (c) Isaac Z. Schlueter and Contributors + +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. diff --git a/node_modules/once/README.md b/node_modules/once/README.md new file mode 100644 index 0000000..1f1ffca --- /dev/null +++ b/node_modules/once/README.md @@ -0,0 +1,79 @@ +# once + +Only call a function once. + +## usage + +```javascript +var once = require('once') + +function load (file, cb) { + cb = once(cb) + loader.load('file') + loader.once('load', cb) + loader.once('error', cb) +} +``` + +Or add to the Function.prototype in a responsible way: + +```javascript +// only has to be done once +require('once').proto() + +function load (file, cb) { + cb = cb.once() + loader.load('file') + loader.once('load', cb) + loader.once('error', cb) +} +``` + +Ironically, the prototype feature makes this module twice as +complicated as necessary. + +To check whether you function has been called, use `fn.called`. Once the +function is called for the first time the return value of the original +function is saved in `fn.value` and subsequent calls will continue to +return this value. + +```javascript +var once = require('once') + +function load (cb) { + cb = once(cb) + var stream = createStream() + stream.once('data', cb) + stream.once('end', function () { + if (!cb.called) cb(new Error('not found')) + }) +} +``` + +## `once.strict(func)` + +Throw an error if the function is called twice. + +Some functions are expected to be called only once. Using `once` for them would +potentially hide logical errors. + +In the example below, the `greet` function has to call the callback only once: + +```javascript +function greet (name, cb) { + // return is missing from the if statement + // when no name is passed, the callback is called twice + if (!name) cb('Hello anonymous') + cb('Hello ' + name) +} + +function log (msg) { + console.log(msg) +} + +// this will print 'Hello anonymous' but the logical error will be missed +greet(null, once(msg)) + +// once.strict will print 'Hello anonymous' and throw an error when the callback will be called the second time +greet(null, once.strict(msg)) +``` diff --git a/node_modules/once/once.js b/node_modules/once/once.js new file mode 100644 index 0000000..2354067 --- /dev/null +++ b/node_modules/once/once.js @@ -0,0 +1,42 @@ +var wrappy = require('wrappy') +module.exports = wrappy(once) +module.exports.strict = wrappy(onceStrict) + +once.proto = once(function () { + Object.defineProperty(Function.prototype, 'once', { + value: function () { + return once(this) + }, + configurable: true + }) + + Object.defineProperty(Function.prototype, 'onceStrict', { + value: function () { + return onceStrict(this) + }, + configurable: true + }) +}) + +function once (fn) { + var f = function () { + if (f.called) return f.value + f.called = true + return f.value = fn.apply(this, arguments) + } + f.called = false + return f +} + +function onceStrict (fn) { + var f = function () { + if (f.called) + throw new Error(f.onceError) + f.called = true + return f.value = fn.apply(this, arguments) + } + var name = fn.name || 'Function wrapped with `once`' + f.onceError = name + " shouldn't be called more than once" + f.called = false + return f +} diff --git a/node_modules/once/package.json b/node_modules/once/package.json new file mode 100644 index 0000000..0e537fd --- /dev/null +++ b/node_modules/once/package.json @@ -0,0 +1,71 @@ +{ + "_args": [ + [ + "once@1.4.0", + "/home/dstaesse/git/website" + ] + ], + "_development": true, + "_from": "once@1.4.0", + "_id": "once@1.4.0", + "_inBundle": false, + "_integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=", + "_location": "/once", + "_phantomChildren": {}, + "_requested": { + "type": "version", + "registry": true, + "raw": "once@1.4.0", + "name": "once", + "escapedName": "once", + "rawSpec": "1.4.0", + "saveSpec": null, + "fetchSpec": "1.4.0" + }, + "_requiredBy": [ + "/glob", + "/inflight" + ], + "_resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz", + "_spec": "1.4.0", + "_where": "/home/dstaesse/git/website", + "author": { + "name": "Isaac Z. Schlueter", + "email": "i@izs.me", + "url": "http://blog.izs.me/" + }, + "bugs": { + "url": "https://github.com/isaacs/once/issues" + }, + "dependencies": { + "wrappy": "1" + }, + "description": "Run a function exactly one time", + "devDependencies": { + "tap": "^7.0.1" + }, + "directories": { + "test": "test" + }, + "files": [ + "once.js" + ], + "homepage": "https://github.com/isaacs/once#readme", + "keywords": [ + "once", + "function", + "one", + "single" + ], + "license": "ISC", + "main": "once.js", + "name": "once", + "repository": { + "type": "git", + "url": "git://github.com/isaacs/once.git" + }, + "scripts": { + "test": "tap test/*.js" + }, + "version": "1.4.0" +} |