1 // Copyright 2017 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 class BaseArgumentsProcessor { 6 constructor(args) { 7 this.args_ = args; 8 this.result_ = this.getDefaultResults(); 9 console.assert(this.result_ !== undefined) 10 console.assert(this.result_.logFileName !== undefined); 11 this.argsDispatch_ = this.getArgsDispatch(); 12 console.assert(this.argsDispatch_ !== undefined); 13 } 14 15 getDefaultResults() { 16 throw "Implement in getDefaultResults in subclass"; 17 } 18 19 getArgsDispatch() { 20 throw "Implement getArgsDispatch in subclass"; 21 } 22 23 result() { return this.result_ } 24 25 printUsageAndExit() { 26 print('Cmdline args: [options] [log-file-name]\n' + 27 'Default log file name is "' + 28 this.result_.logFileName + '".\n'); 29 print('Options:'); 30 for (var arg in this.argsDispatch_) { 31 var synonyms = [arg]; 32 var dispatch = this.argsDispatch_[arg]; 33 for (var synArg in this.argsDispatch_) { 34 if (arg !== synArg && dispatch === this.argsDispatch_[synArg]) { 35 synonyms.push(synArg); 36 delete this.argsDispatch_[synArg]; 37 } 38 } 39 print(' ' + synonyms.join(', ').padEnd(20) + " " + dispatch[2]); 40 } 41 quit(2); 42 } 43 44 parse() { 45 while (this.args_.length) { 46 var arg = this.args_.shift(); 47 if (arg.charAt(0) != '-') { 48 this.result_.logFileName = arg; 49 continue; 50 } 51 var userValue = null; 52 var eqPos = arg.indexOf('='); 53 if (eqPos != -1) { 54 userValue = arg.substr(eqPos + 1); 55 arg = arg.substr(0, eqPos); 56 } 57 if (arg in this.argsDispatch_) { 58 var dispatch = this.argsDispatch_[arg]; 59 var property = dispatch[0]; 60 var defaultValue = dispatch[1]; 61 if (typeof defaultValue == "function") { 62 userValue = defaultValue(userValue); 63 } else if (userValue == null) { 64 userValue = defaultValue; 65 } 66 this.result_[property] = userValue; 67 } else { 68 return false; 69 } 70 } 71 return true; 72 } 73 } 74 75 function parseBool(str) { 76 if (str == "true" || str == "1") return true; 77 return false; 78 } 79