v8/tools/turbolizer/selection.js

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// Copyright 2015 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.
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();
}
count = 0;
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;
}
this.selection.add(i);
}
} else {
let unselectSet = new Set();
for (let i of s) {
if (this.selection.has(i)) {
unselectSet.add(i);
this.selection.delete(i);
}
}
}
handler.select(this.selection, isSelected);
}
Selection.prototype.extendTo = function(pos) {
if (pos == this.lastSelection || this.lastSelection === null) return;
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);
}
}
}
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);
}
this.clear();
return result;
}