1 files changed, 78 insertions, 0 deletions
diff --git a/deps/v8/tools/arguments.mjs b/deps/v8/tools/arguments.mjs
new file mode 100644
index 0000000000..232ca6badb
--- /dev/null
+++ b/deps/v8/tools/arguments.mjs
@@ -0,0 +1,78 @@
+// 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;
+    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_ }
+
+  printUsageAndExit() {
+    print('Cmdline args: [options] [log-file-name]\n' +
+          'Default log file name is "' +
+          this.result_.logFileName + '".\n');
+    print('Options:');
+    for (var arg in this.argsDispatch_) {
+      var synonyms = [arg];
+      var dispatch = this.argsDispatch_[arg];
+      for (var synArg in this.argsDispatch_) {
+        if (arg !== synArg && dispatch === this.argsDispatch_[synArg]) {
+          synonyms.push(synArg);
+          delete this.argsDispatch_[synArg];
+        }
+      }
+      print('  ' + synonyms.join(', ').padEnd(20) + " " + dispatch[2]);
+    }
+    quit(2);
+  }
+
+  parse() {
+    while (this.args_.length) {
+      var arg = this.args_.shift();
+      if (arg.charAt(0) != '-') {
+        this.result_.logFileName = arg;
+        continue;
+      }
+      var userValue = null;
+      var eqPos = arg.indexOf('=');
+      if (eqPos != -1) {
+        userValue = arg.substr(eqPos + 1);
+        arg = arg.substr(0, eqPos);
+      }
+      if (arg in this.argsDispatch_) {
+        var dispatch = this.argsDispatch_[arg];
+        var property = dispatch[0];
+        var 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;
+}