chrome-devtools-frontend
Version:
Chrome DevTools UI
123 lines (119 loc) • 2.92 kB
JavaScript
// Copyright 2023 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
const rule = require('../lib/canvas_context_tracking.js');
const ruleTester = new (require('eslint').RuleTester)({
parserOptions: {ecmaVersion: 9, sourceType: 'module'},
});
ruleTester.run('canvas_context_tracking_test', rule, {
valid: [
{
code: `function renderCanvas() {
context.save();
context.fillRect(0, 0, 100, 100);
context.restore()
}`,
filename: 'perf_ui/flamechart.js',
},
{
code: `function renderCanvas() {
context.save();
for(const event of events) {
context.save()
context.fillRect(0, 0, 100, 100);
context.restore()
}
context.restore();
}`,
filename: 'perf_ui/flamechart.js',
},
{
code: `function renderCanvas() {
context.save();
for(const event of events) {
context.save()
context.fillRect(0, 0, 100, 100);
for(const x of y) {
context.fillRect(0, 0, 100, 100);
}
context.restore()
}
context.restore();
}`,
filename: 'perf_ui/flamechart.js',
},
{
code: `function renderCanvas() {
context.save();
for(const event of events) {
context.save()
context.fillRect(0, 0, 100, 100);
for(const x of y) {
context.save()
context.fillRect(0, 0, 100, 100);
context.restore()
}
context.restore()
}
context.restore();
}`,
filename: 'perf_ui/flamechart.js',
}
],
invalid: [
{
code: `function renderCanvas() {
context.save();
context.fillRect(0, 0, 100, 100);
// Missing a context.restore()
}`,
filename: 'perf_ui/flamechart.js',
errors: [{messageId: 'saveNotRestored'}],
},
{
code: `function renderCanvas() {
// Restore and save are the wrong way round
context.restore()
context.fillRect(0, 0, 100, 100);
context.save();
}`,
filename: 'perf_ui/flamechart.js',
errors: [{messageId: 'uselessRestore'}, {messageId: 'saveNotRestored'}],
},
{
code: `function renderCanvas() {
// Missing a context.save()
context.fillRect(0, 0, 100, 100);
context.restore()
}`,
filename: 'perf_ui/flamechart.js',
errors: [{messageId: 'uselessRestore'}],
},
{
code: `function renderCanvas() {
context.save();
for(const event of events) {
context.save()
context.fillRect(0, 0, 100, 100);
// Missing a context.restore()
}
context.restore();
}`,
filename: 'perf_ui/flamechart.js',
errors: [{messageId: 'saveNotRestored'}],
},
{
code: `function renderCanvas() {
context.save();
for(const event in events) {
context.save()
context.fillRect(0, 0, 100, 100);
// Missing a context.restore()
}
context.restore();
}`,
filename: 'perf_ui/flamechart.js',
errors: [{messageId: 'saveNotRestored'}],
},
]
});