1 files changed, 41 insertions, 89 deletions
diff --git a/deps/v8/tools/turbolizer/selection.js b/deps/v8/tools/turbolizer/selection.js
index 26f1bde197..9bd937c84a 100644
--- a/deps/v8/tools/turbolizer/selection.js
+++ b/deps/v8/tools/turbolizer/selection.js
@@ -2,107 +2,59 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var Selection = function(handler) {
-  this.handler = handler;
-  this.selectionBase = null;
-  this.lastSelection = null;
-  this.selection = new Set();
-}
-
-
-Selection.prototype.isEmpty = function() {
-  return this.selection.size == 0;
-}
-
-
-Selection.prototype.clear = function() {
-  var handler = this.handler;
-  this.selectionBase = null;
-  this.lastSelection = null;
-  handler.select(this.selection, false);
-  handler.clear();
-  this.selection = new Set();
-}
+class Selection {
+  constructor(stringKeyFnc) {
+    this.selection = new Map();
+    this.stringKey = stringKeyFnc;
+  }
 
+  isEmpty() {
+    return this.selection.size == 0;
+  }
 
-count = 0;
+  clear() {
+    this.selection = new Map();
+  }
 
-Selection.prototype.select = function(s, isSelected) {
-  var handler = this.handler;
-  if (!(Symbol.iterator in Object(s))) { s = [s]; }
-  if (isSelected) {
-    let first = true;
-    for (let i of s) {
-      if (first) {
-        this.selectionBase = i;
-        this.lastSelection = i;
-        first = false;
+  select(s, isSelected) {
+    if (!isIterable(s)) { s = [s]; }
+    for (const i of s) {
+      if (!i) continue;
+      if (isSelected == undefined) {
+        isSelected = !this.selection.has(this.stringKey(i));
       }
-      this.selection.add(i);
-    }
-    handler.select(this.selection, true);
-  } else {
-    let unselectSet = new Set();
-    for (let i of s) {
-      if (this.selection.has(i)) {
-        unselectSet.add(i);
-        this.selection.delete(i);
+      if (isSelected) {
+        this.selection.set(this.stringKey(i), i);
+      } else {
+        this.selection.delete(this.stringKey(i));
       }
     }
-    handler.select(unselectSet, false);
   }
-}
 
+  isSelected(i) {
+    return this.selection.has(this.stringKey(i));
+  }
 
-Selection.prototype.extendTo = function(pos) {
-  if (pos == this.lastSelection || this.lastSelection === null) return;
+  isKeySelected(key) {
+    return this.selection.has(key);
+  }
 
-  var handler = this.handler;
-  var pos_diff = handler.selectionDifference(pos, true, this.lastSelection, false);
-  var unselect_diff = [];
-  if (pos_diff.length == 0) {
-    pos_diff = handler.selectionDifference(this.selectionBase, false, pos, true);
-    if (pos_diff.length != 0) {
-      unselect_diff = handler.selectionDifference(this.lastSelection, true, this.selectionBase, false);
-      this.selection = new Set();
-      this.selection.add(this.selectionBase);
-      for (var d of pos_diff) {
-        this.selection.add(d);
-      }
-    } else {
-      unselect_diff = handler.selectionDifference(this.lastSelection, true, pos, false);
-      for (var d of unselect_diff) {
-        this.selection.delete(d);
-      }
-    }
-  } else {
-    unselect_diff = handler.selectionDifference(this.selectionBase, false, this.lastSelection, true);
-    if (unselect_diff != 0) {
-      pos_diff = handler.selectionDifference(pos, true, this.selectionBase, false);
-      if (pos_diff.length == 0) {
-        unselect_diff = handler.selectionDifference(pos, false, this.lastSelection, true);
-      }
-      for (var d of unselect_diff) {
-        this.selection.delete(d);
-      }
-    }
-    if (pos_diff.length != 0) {
-      for (var d of pos_diff) {
-        this.selection.add(d);
-      }
+  selectedKeys() {
+    var result = new Set();
+    for (var i of this.selection.keys()) {
+      result.add(i);
     }
+    return result;
   }
-  handler.select(unselect_diff, false);
-  handler.select(pos_diff, true);
-  this.lastSelection = pos;
-}
 
-
-Selection.prototype.detachSelection = function() {
-  var result = new Set();
-  for (var i of this.selection) {
-    result.add(i);
+  detachSelection() {
+    var result = new Set();
+    for (var i of this.selection.keys()) {
+      result.add(i);
+    }
+    this.clear();
+    return result;
   }
-  this.clear();
-  return result;
+
+  [Symbol.iterator]() { return this.selection.values() }
 }