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Pradhan V
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Oct 27, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| 'use strict'; | ||
| // | ||
| const Chain = function Chain (delay, functionArray, callback) { | ||
| if (!(this instanceof Chain)) { | ||
| return new Chain(delay, functionArray); | ||
| } | ||
| if (delay) { | ||
| this.setDelay(delay); | ||
| } | ||
| if (functionArray) { | ||
| this.setFunctions(functionArray); | ||
| } | ||
| if (callback) { | ||
| this.setCallback(callback); | ||
| } | ||
| }; | ||
| // | ||
| Chain.prototype.setDelay = function (millis) { | ||
| this._delay = millis; | ||
| }; | ||
| // | ||
| Chain.prototype.setFunctionArgs = function (args) { | ||
| this._functionArgs = args; | ||
| }; | ||
| // | ||
| Chain.prototype.setFunctions = function (functionArray) { | ||
| this._functionArray = functionArray; | ||
| }; | ||
| // | ||
| Chain.prototype.setCallback = function (callback) { | ||
| this._callback = callback; | ||
| }; | ||
| // | ||
| Chain.prototype.startCalls = function (...args) { | ||
| if (args && args.length > 0) { | ||
| this.setFunctionArgs(args); | ||
| } | ||
| return this._callFunctions(...[this._delay, this._functionArray].concat(this._functionArgs)); | ||
| }; | ||
| // | ||
| // functionArguments will have the return value from the previous function call | ||
| // and the original function arguments which was set or passed to startCalls function. | ||
| Chain.prototype._callFunctions = function (delay, functions, ...args) { | ||
| // the last argument will be the return value | ||
| const [previousResult] = args.slice(-1); | ||
| if (!functions || functions.length === 0) { | ||
| // if there are no functions to invoke then callback | ||
| if (this._callback) { | ||
| this._callback(previousResult); | ||
| } | ||
| return; | ||
| } | ||
| let fnReturnValue = null; | ||
| try { | ||
| // invoke the function | ||
| fnReturnValue = functions[0].apply(functions[0], args); | ||
| } catch (err) { | ||
| if (this._callback) { | ||
| this._callback.apply(this._callback, err); | ||
| } | ||
| return; | ||
| } | ||
| // remove the invoked function from the array | ||
| const nextFunctions = functions.slice(1); | ||
| // check if return value is another chain | ||
| if (fnReturnValue && fnReturnValue instanceof Chain && fnReturnValue._functionArray && | ||
| fnReturnValue._functionArray[0]) { | ||
| // push the new chain's functions to the beginning of the original chain | ||
| nextFunctions.unshift(...fnReturnValue._functionArray); | ||
| // replace function arguments | ||
| if (fnReturnValue._functionArgs && fnReturnValue._functionArgs !== null && | ||
| fnReturnValue._functionArgs.length > 0) { | ||
| fnReturnValue = fnReturnValue._functionArgs; | ||
| } else { | ||
| // [retvalue] = args; | ||
| fnReturnValue = previousResult; | ||
| } | ||
| } | ||
| // prepare arguments for the next function call | ||
| let callargs = [delay, nextFunctions]; | ||
| // add original arguments | ||
| if (this._functionArgs) { | ||
| callargs = callargs.concat(this._functionArgs); | ||
| } | ||
| // then add the return value of the previous function. | ||
| callargs = callargs.concat(fnReturnValue); | ||
| // callargs, the parameters for the next function will have | ||
| // return value if previous function, original args | ||
| const that = this; | ||
| if (delay && delay > 0) { | ||
| setTimeout(() => { | ||
| that._callFunctions(...callargs); | ||
| }, delay); | ||
| } else { | ||
| // TODO: fix stackoverflow | ||
| that._callFunctions(...callargs); | ||
| } | ||
| }; | ||
| // | ||
| const create = function (delay, functionArray, callback, ...args) { | ||
| const fchain = new Chain(delay, functionArray, callback); | ||
| fchain.setFunctionArgs(args); | ||
| return fchain; | ||
| }; | ||
| // | ||
| module.exports = {create}; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,95 +1,42 @@ | ||
| 'use strict'; | ||
| // | ||
| const Chain = function Chain (timeout, functionArray, callback) { | ||
| if (!(this instanceof Chain)) { | ||
| return new Chain(timeout, functionArray); | ||
| } | ||
| if (timeout) { | ||
| this.setTimeout(timeout); | ||
| } | ||
| if (functionArray) { | ||
| this.setFunctions(functionArray); | ||
| } | ||
| if (callback) { | ||
| this.setCallback(callback); | ||
| } | ||
| }; | ||
| // | ||
| Chain.prototype.setTimeout = function (millis) { | ||
| this._timeout = millis; | ||
| }; | ||
| // | ||
| Chain.prototype.setFunctionArgs = function (args) { | ||
| this._functionArgs = args; | ||
| }; | ||
| // | ||
| Chain.prototype.setFunctions = function (functionArray) { | ||
| this._functionArray = functionArray; | ||
| }; | ||
| // | ||
| Chain.prototype.setCallback = function (callback) { | ||
| this._callback = callback; | ||
| }; | ||
| // | ||
| Chain.prototype.startCalls = function (...args) { | ||
| if (args && args.length > 0) { | ||
| this.setFunctionArgs(args); | ||
| } | ||
| return this._callFunctions(...[this._timeout, this._functionArray].concat(this._functionArgs)); | ||
| }; | ||
| const chain = require('./chain'); | ||
| // | ||
| // functionArguments will have the return value from the previous function call | ||
| // and the original function arguments which was set or passed to startCalls function. | ||
| Chain.prototype._callFunctions = function (timeout, functions, ...args) { | ||
| // get arguments to the functiongs | ||
| if (!functions || functions.length === 0) { | ||
| // if there are no functions to invoke then callback | ||
| if (this._callback) { | ||
| this._callback.apply(this._callback, args); | ||
| } | ||
| return; | ||
| } | ||
| let retvalue = null; | ||
| const repeatFunction = function (actualFunction, continueCallback, ...args) { | ||
| let result = null; | ||
| try { | ||
| // invoke the function | ||
| retvalue = functions[0].apply(functions[0], args); | ||
| result = actualFunction(...args); | ||
| } catch (err) { | ||
| if (this._callback) { | ||
| this._callback.apply(this._callback, err); | ||
| if (continueCallback) { | ||
| // TODO: use the callback and decide to stop. | ||
| continueCallback(err, result); | ||
| } | ||
| return; | ||
| } | ||
| // remove the invoked function from the array | ||
| const nextFunctions = functions.slice(1); | ||
| // check if return value is another chain | ||
| if (retvalue && retvalue instanceof Chain && retvalue._functionArray && retvalue._functionArray[0]) { | ||
| // push the new chain's functions to the beginning of the original chain | ||
| nextFunctions.unshift(...retvalue._functionArray); | ||
| // replace function arguments | ||
| if (retvalue._functionArgs) { | ||
| retvalue = retvalue._functionArgs; | ||
| } else { | ||
| retvalue = args; | ||
| } | ||
| } | ||
| // prepare arguments for the next function call | ||
| let callargs = [timeout, nextFunctions]; | ||
| // add the return value of the previous function first | ||
| if (retvalue) { | ||
| callargs = callargs.concat(retvalue); | ||
| } | ||
| // then add original arguments | ||
| if (this._functionArgs) { | ||
| callargs = callargs.concat(this._functionArgs); | ||
| let repeat = false; | ||
| if (continueCallback) { | ||
| repeat = continueCallback(null, result); | ||
| } | ||
| const that = this; | ||
| if (timeout && timeout > 0) { | ||
| setTimeout(() => { | ||
| that._callFunctions(...callargs); | ||
| }, timeout); | ||
| } else { | ||
| that._callFunctions(...callargs); | ||
| if (repeat) { | ||
| const fcc = chain.create(); | ||
| fcc.setFunctions([repeatFunction]); | ||
| // args.unshift(actualFunction); | ||
| // fcc.setFunctionArgs([actualFunction, continueCallback, resultCallback].concat(result)); | ||
| fcc.setFunctionArgs([result]); | ||
| return fcc; | ||
| } | ||
| return result; | ||
| }; | ||
| // | ||
| module.exports = Chain; | ||
| const createRepeatFunctionChain = function (actualFunction, continueCallback, resultCallback, ...args) { | ||
| const fchain = chain.create( | ||
| -1, [repeatFunction], resultCallback, | ||
| actualFunction, continueCallback, ...args | ||
| ); | ||
| return fchain; | ||
| }; | ||
| // | ||
| module.exports = { | ||
| 'create': chain.create, | ||
| createRepeatFunctionChain, | ||
| repeatFunction | ||
| }; |
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