diff options
Diffstat (limited to 'node_modules/bluebird/js/main/promisify.js')
| -rw-r--r-- | node_modules/bluebird/js/main/promisify.js | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/node_modules/bluebird/js/main/promisify.js b/node_modules/bluebird/js/main/promisify.js new file mode 100644 index 000000000..0b3354222 --- /dev/null +++ b/node_modules/bluebird/js/main/promisify.js @@ -0,0 +1,294 @@ +"use strict"; +module.exports = function(Promise, INTERNAL) { +var THIS = {}; +var util = require("./util.js"); +var nodebackForPromise = require("./promise_resolver.js") + ._nodebackForPromise; +var withAppended = util.withAppended; +var maybeWrapAsError = util.maybeWrapAsError; +var canEvaluate = util.canEvaluate; +var TypeError = require("./errors").TypeError; +var defaultSuffix = "Async"; +var defaultPromisified = {__isPromisified__: true}; +var noCopyPropsPattern = + /^(?:length|name|arguments|caller|callee|prototype|__isPromisified__)$/; +var defaultFilter = function(name) { + return util.isIdentifier(name) && + name.charAt(0) !== "_" && + name !== "constructor"; +}; + +function propsFilter(key) { + return !noCopyPropsPattern.test(key); +} + +function isPromisified(fn) { + try { + return fn.__isPromisified__ === true; + } + catch (e) { + return false; + } +} + +function hasPromisified(obj, key, suffix) { + var val = util.getDataPropertyOrDefault(obj, key + suffix, + defaultPromisified); + return val ? isPromisified(val) : false; +} +function checkValid(ret, suffix, suffixRegexp) { + for (var i = 0; i < ret.length; i += 2) { + var key = ret[i]; + if (suffixRegexp.test(key)) { + var keyWithoutAsyncSuffix = key.replace(suffixRegexp, ""); + for (var j = 0; j < ret.length; j += 2) { + if (ret[j] === keyWithoutAsyncSuffix) { + throw new TypeError("Cannot promisify an API that has normal methods with '%s'-suffix\u000a\u000a See http://goo.gl/iWrZbw\u000a" + .replace("%s", suffix)); + } + } + } + } +} + +function promisifiableMethods(obj, suffix, suffixRegexp, filter) { + var keys = util.inheritedDataKeys(obj); + var ret = []; + for (var i = 0; i < keys.length; ++i) { + var key = keys[i]; + var value = obj[key]; + var passesDefaultFilter = filter === defaultFilter + ? true : defaultFilter(key, value, obj); + if (typeof value === "function" && + !util.isNativeFunctionMethod(value) && + !isPromisified(value) && + !hasPromisified(obj, key, suffix) && + filter(key, value, obj, passesDefaultFilter)) { + ret.push(key, value); + } + } + checkValid(ret, suffix, suffixRegexp); + return ret; +} + +var escapeIdentRegex = function(str) { + return str.replace(/([$])/, "\\$"); +}; + +var makeNodePromisifiedEval; +if (!false) { +var switchCaseArgumentOrder = function(likelyArgumentCount) { + var ret = [likelyArgumentCount]; + var min = Math.max(0, likelyArgumentCount - 1 - 3); + for(var i = likelyArgumentCount - 1; i >= min; --i) { + ret.push(i); + } + for(var i = likelyArgumentCount + 1; i <= 3; ++i) { + ret.push(i); + } + return ret; +}; + +var argumentSequence = function(argumentCount) { + return util.filledRange(argumentCount, "_arg", ""); +}; + +var parameterDeclaration = function(parameterCount) { + return util.filledRange( + Math.max(parameterCount, 3), "_arg", ""); +}; + +var parameterCount = function(fn) { + if (typeof fn.length === "number") { + return Math.max(Math.min(fn.length, 1023 + 1), 0); + } + return 0; +}; + +makeNodePromisifiedEval = +function(callback, receiver, originalName, fn) { + var newParameterCount = Math.max(0, parameterCount(fn) - 1); + var argumentOrder = switchCaseArgumentOrder(newParameterCount); + var shouldProxyThis = typeof callback === "string" || receiver === THIS; + + function generateCallForArgumentCount(count) { + var args = argumentSequence(count).join(", "); + var comma = count > 0 ? ", " : ""; + var ret; + if (shouldProxyThis) { + ret = "ret = callback.call(this, {{args}}, nodeback); break;\n"; + } else { + ret = receiver === undefined + ? "ret = callback({{args}}, nodeback); break;\n" + : "ret = callback.call(receiver, {{args}}, nodeback); break;\n"; + } + return ret.replace("{{args}}", args).replace(", ", comma); + } + + function generateArgumentSwitchCase() { + var ret = ""; + for (var i = 0; i < argumentOrder.length; ++i) { + ret += "case " + argumentOrder[i] +":" + + generateCallForArgumentCount(argumentOrder[i]); + } + + ret += " \n\ + default: \n\ + var args = new Array(len + 1); \n\ + var i = 0; \n\ + for (var i = 0; i < len; ++i) { \n\ + args[i] = arguments[i]; \n\ + } \n\ + args[i] = nodeback; \n\ + [CodeForCall] \n\ + break; \n\ + ".replace("[CodeForCall]", (shouldProxyThis + ? "ret = callback.apply(this, args);\n" + : "ret = callback.apply(receiver, args);\n")); + return ret; + } + + var getFunctionCode = typeof callback === "string" + ? ("this != null ? this['"+callback+"'] : fn") + : "fn"; + + return new Function("Promise", + "fn", + "receiver", + "withAppended", + "maybeWrapAsError", + "nodebackForPromise", + "tryCatch", + "errorObj", + "notEnumerableProp", + "INTERNAL","'use strict'; \n\ + var ret = function (Parameters) { \n\ + 'use strict'; \n\ + var len = arguments.length; \n\ + var promise = new Promise(INTERNAL); \n\ + promise._captureStackTrace(); \n\ + var nodeback = nodebackForPromise(promise); \n\ + var ret; \n\ + var callback = tryCatch([GetFunctionCode]); \n\ + switch(len) { \n\ + [CodeForSwitchCase] \n\ + } \n\ + if (ret === errorObj) { \n\ + promise._rejectCallback(maybeWrapAsError(ret.e), true, true);\n\ + } \n\ + return promise; \n\ + }; \n\ + notEnumerableProp(ret, '__isPromisified__', true); \n\ + return ret; \n\ + " + .replace("Parameters", parameterDeclaration(newParameterCount)) + .replace("[CodeForSwitchCase]", generateArgumentSwitchCase()) + .replace("[GetFunctionCode]", getFunctionCode))( + Promise, + fn, + receiver, + withAppended, + maybeWrapAsError, + nodebackForPromise, + util.tryCatch, + util.errorObj, + util.notEnumerableProp, + INTERNAL + ); +}; +} + +function makeNodePromisifiedClosure(callback, receiver, _, fn) { + var defaultThis = (function() {return this;})(); + var method = callback; + if (typeof method === "string") { + callback = fn; + } + function promisified() { + var _receiver = receiver; + if (receiver === THIS) _receiver = this; + var promise = new Promise(INTERNAL); + promise._captureStackTrace(); + var cb = typeof method === "string" && this !== defaultThis + ? this[method] : callback; + var fn = nodebackForPromise(promise); + try { + cb.apply(_receiver, withAppended(arguments, fn)); + } catch(e) { + promise._rejectCallback(maybeWrapAsError(e), true, true); + } + return promise; + } + util.notEnumerableProp(promisified, "__isPromisified__", true); + return promisified; +} + +var makeNodePromisified = canEvaluate + ? makeNodePromisifiedEval + : makeNodePromisifiedClosure; + +function promisifyAll(obj, suffix, filter, promisifier) { + var suffixRegexp = new RegExp(escapeIdentRegex(suffix) + "$"); + var methods = + promisifiableMethods(obj, suffix, suffixRegexp, filter); + + for (var i = 0, len = methods.length; i < len; i+= 2) { + var key = methods[i]; + var fn = methods[i+1]; + var promisifiedKey = key + suffix; + obj[promisifiedKey] = promisifier === makeNodePromisified + ? makeNodePromisified(key, THIS, key, fn, suffix) + : promisifier(fn, function() { + return makeNodePromisified(key, THIS, key, fn, suffix); + }); + } + util.toFastProperties(obj); + return obj; +} + +function promisify(callback, receiver) { + return makeNodePromisified(callback, receiver, undefined, callback); +} + +Promise.promisify = function (fn, receiver) { + if (typeof fn !== "function") { + throw new TypeError("fn must be a function\u000a\u000a See http://goo.gl/916lJJ\u000a"); + } + if (isPromisified(fn)) { + return fn; + } + var ret = promisify(fn, arguments.length < 2 ? THIS : receiver); + util.copyDescriptors(fn, ret, propsFilter); + return ret; +}; + +Promise.promisifyAll = function (target, options) { + if (typeof target !== "function" && typeof target !== "object") { + throw new TypeError("the target of promisifyAll must be an object or a function\u000a\u000a See http://goo.gl/9ITlV0\u000a"); + } + options = Object(options); + var suffix = options.suffix; + if (typeof suffix !== "string") suffix = defaultSuffix; + var filter = options.filter; + if (typeof filter !== "function") filter = defaultFilter; + var promisifier = options.promisifier; + if (typeof promisifier !== "function") promisifier = makeNodePromisified; + + if (!util.isIdentifier(suffix)) { + throw new RangeError("suffix must be a valid identifier\u000a\u000a See http://goo.gl/8FZo5V\u000a"); + } + + var keys = util.inheritedDataKeys(target); + for (var i = 0; i < keys.length; ++i) { + var value = target[keys[i]]; + if (keys[i] !== "constructor" && + util.isClass(value)) { + promisifyAll(value.prototype, suffix, filter, promisifier); + promisifyAll(value, suffix, filter, promisifier); + } + } + + return promisifyAll(target, suffix, filter, promisifier); +}; +}; + |