// Copyright 2017 the V8 project authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

export class BaseArgumentsProcessor {

constructor(args) {

this.args_ = args.slice();

this.result_ = this.getDefaultResults();

console.assert(this.result_ !== undefined)

console.assert(this.result_.logFileName !== undefined);

this.argsDispatch_ = this.getArgsDispatch();

console.assert(this.argsDispatch_ !== undefined);

}

getDefaultResults() {

throw "Implement in getDefaultResults in subclass";

}

getArgsDispatch() {

throw "Implement getArgsDispatch in subclass";

}

result() { return this.result_ }

static process(args) {

const processor = new this(args);

if (processor.parse()) {

return processor.result();

} else {

processor.printUsageAndExit();

return false;

}

}

printUsageAndExit() {

console.log('Cmdline args: [options] [log-file-name]\n' +

'Default log file name is "' +

this.result_.logFileName + '".\n');

console.log('Options:');

for (const arg in this.argsDispatch_) {

const synonyms = [arg];

const dispatch = this.argsDispatch_[arg];

for (const synArg in this.argsDispatch_) {

if (arg !== synArg && dispatch === this.argsDispatch_[synArg]) {

synonyms.push(synArg);

delete this.argsDispatch_[synArg];

}

}

console.log(` ${synonyms.join(', ').padEnd(20)} ${dispatch[2]}`);

}

quit(2);

}

parse() {

while (this.args_.length) {

let arg = this.args_.shift();

if (arg.charAt(0) != '-') {

this.result_.logFileName = arg;

continue;

}

let userValue = null;

const eqPos = arg.indexOf('=');

if (eqPos != -1) {

userValue = arg.substr(eqPos + 1);

arg = arg.substr(0, eqPos);

}

if (arg in this.argsDispatch_) {

const dispatch = this.argsDispatch_[arg];

const property = dispatch[0];

const defaultValue = dispatch[1];

if (typeof defaultValue == "function") {

userValue = defaultValue(userValue);

} else if (userValue == null) {

userValue = defaultValue;

}

this.result_[property] = userValue;

} else {

return false;

}

}

return true;

}

}

export function parseBool(str) {

if (str == "true" || str == "1") return true;

return false;

}