456 lines
40 KiB
JavaScript
456 lines
40 KiB
JavaScript
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this.innerHTML = '<ol class="chapter"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="title-page.html">The Rust Programming Language</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="foreword.html">Foreword</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch00-00-introduction.html">Introduction</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch01-00-getting-started.html"><strong aria-hidden="true">1.</strong> Getting Started</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch01-01-installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch01-02-hello-world.html"><strong aria-hidden="true">1.2.</strong> Hello, World!</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch01-03-hello-cargo.html"><strong aria-hidden="true">1.3.</strong> Hello, Cargo!</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch02-00-guessing-game-tutorial.html"><strong aria-hidden="true">2.</strong> Programming a Guessing Game</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-00-common-programming-concepts.html"><strong aria-hidden="true">3.</strong> Common Programming Concepts</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-01-variables-and-mutability.html"><strong aria-hidden="true">3.1.</strong> Variables and Mutability</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-02-data-types.html"><strong aria-hidden="true">3.2.</strong> Data Types</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-03-how-functions-work.html"><strong aria-hidden="true">3.3.</strong> Functions</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-04-comments.html"><strong aria-hidden="true">3.4.</strong> Comments</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch03-05-control-flow.html"><strong aria-hidden="true">3.5.</strong> Control Flow</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch04-00-understanding-ownership.html"><strong aria-hidden="true">4.</strong> Understanding Ownership</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch04-01-what-is-ownership.html"><strong aria-hidden="true">4.1.</strong> What is Ownership?</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch04-02-references-and-borrowing.html"><strong aria-hidden="true">4.2.</strong> References and Borrowing</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch04-03-slices.html"><strong aria-hidden="true">4.3.</strong> The Slice Type</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch05-00-structs.html"><strong aria-hidden="true">5.</strong> Using Structs to Structure Related Data</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch05-01-defining-structs.html"><strong aria-hidden="true">5.1.</strong> Defining and Instantiating Structs</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch05-02-example-structs.html"><strong aria-hidden="true">5.2.</strong> An Example Program Using Structs</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch05-03-method-syntax.html"><strong aria-hidden="true">5.3.</strong> Methods</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch06-00-enums.html"><strong aria-hidden="true">6.</strong> Enums and Pattern Matching</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch06-01-defining-an-enum.html"><strong aria-hidden="true">6.1.</strong> Defining an Enum</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch06-02-match.html"><strong aria-hidden="true">6.2.</strong> The match Control Flow Construct</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch06-03-if-let.html"><strong aria-hidden="true">6.3.</strong> Concise Control Flow with if let and let...else</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-00-managing-growing-projects-with-packages-crates-and-modules.html"><strong aria-hidden="true">7.</strong> Packages, Crates, and Modules</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-01-packages-and-crates.html"><strong aria-hidden="true">7.1.</strong> Packages and Crates</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-02-defining-modules-to-control-scope-and-privacy.html"><strong aria-hidden="true">7.2.</strong> Control Scope and Privacy with Modules</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html"><strong aria-hidden="true">7.3.</strong> Paths for Referring to an Item in the Module Tree</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-04-bringing-paths-into-scope-with-the-use-keyword.html"><strong aria-hidden="true">7.4.</strong> Bringing Paths Into Scope with the use Keyword</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch07-05-separating-modules-into-different-files.html"><strong aria-hidden="true">7.5.</strong> Separating Modules into Different Files</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch08-00-common-collections.html"><strong aria-hidden="true">8.</strong> Common Collections</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch08-01-vectors.html"><strong aria-hidden="true">8.1.</strong> Storing Lists of Values with Vectors</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch08-02-strings.html"><strong aria-hidden="true">8.2.</strong> Storing UTF-8 Encoded Text with Strings</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch08-03-hash-maps.html"><strong aria-hidden="true">8.3.</strong> Storing Keys with Associated Values in Hash Maps</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch09-00-error-handling.html"><strong aria-hidden="true">9.</strong> Error Handling</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch09-01-unrecoverable-errors-with-panic.html"><strong aria-hidden="true">9.1.</strong> Unrecoverable Errors with panic!</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch09-02-recoverable-errors-with-result.html"><strong aria-hidden="true">9.2.</strong> Recoverable Errors with Result</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch09-03-to-panic-or-not-to-panic.html"><strong aria-hidden="true">9.3.</strong> To panic! or Not to panic!</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch10-00-generics.html"><strong aria-hidden="true">10.</strong> Generic Types, Traits, and Lifetimes</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch10-01-syntax.html"><strong aria-hidden="true">10.1.</strong> Generic Data Types</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch10-02-traits.html"><strong aria-hidden="true">10.2.</strong> Defining Shared Behavior with Traits</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch10-03-lifetime-syntax.html"><strong aria-hidden="true">10.3.</strong> Validating References with Lifetimes</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch11-00-testing.html"><strong aria-hidden="true">11.</strong> Writing Automated Tests</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch11-01-writing-tests.html"><strong aria-hidden="true">11.1.</strong> How to Write Tests</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch11-02-running-tests.html"><strong aria-hidden="true">11.2.</strong> Controlling How Tests Are Run</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch11-03-test-organization.html"><strong aria-hidden="true">11.3.</strong> Test Organization</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-00-an-io-project.html"><strong aria-hidden="true">12.</strong> An I/O Project: Building a Command Line Program</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-01-accepting-command-line-arguments.html"><strong aria-hidden="true">12.1.</strong> Accepting Command Line Arguments</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-02-reading-a-file.html"><strong aria-hidden="true">12.2.</strong> Reading a File</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-03-improving-error-handling-and-modularity.html"><strong aria-hidden="true">12.3.</strong> Refactoring to Improve Modularity and Error Handling</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-04-testing-the-librarys-functionality.html"><strong aria-hidden="true">12.4.</strong> Adding Functionality with Test Driven Development</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-05-working-with-environment-variables.html"><strong aria-hidden="true">12.5.</strong> Working with Environment Variables</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch12-06-writing-to-stderr-instead-of-stdout.html"><strong aria-hidden="true">12.6.</strong> Redirecting Errors to Standard Error</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch13-00-functional-features.html"><strong aria-hidden="true">13.</strong> Functional Language Features: Iterators and Closures</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch13-01-closures.html"><strong aria-hidden="true">13.1.</strong> Closures</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch13-02-iterators.html"><strong aria-hidden="true">13.2.</strong> Processing a Series of Items with Iterators</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch13-03-improving-our-io-project.html"><strong aria-hidden="true">13.3.</strong> Improving Our I/O Project</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch13-04-performance.html"><strong aria-hidden="true">13.4.</strong> Performance in Loops vs. Iterators</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-00-more-about-cargo.html"><strong aria-hidden="true">14.</strong> More about Cargo and Crates.io</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-01-release-profiles.html"><strong aria-hidden="true">14.1.</strong> Customizing Builds with Release Profiles</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-02-publishing-to-crates-io.html"><strong aria-hidden="true">14.2.</strong> Publishing a Crate to Crates.io</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-03-cargo-workspaces.html"><strong aria-hidden="true">14.3.</strong> Cargo Workspaces</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-04-installing-binaries.html"><strong aria-hidden="true">14.4.</strong> Installing Binaries with cargo install</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch14-05-extending-cargo.html"><strong aria-hidden="true">14.5.</strong> Extending Cargo with Custom Commands</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-00-smart-pointers.html"><strong aria-hidden="true">15.</strong> Smart Pointers</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-01-box.html"><strong aria-hidden="true">15.1.</strong> Using Box<T> to Point to Data on the Heap</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-02-deref.html"><strong aria-hidden="true">15.2.</strong> Treating Smart Pointers Like Regular References</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-03-drop.html"><strong aria-hidden="true">15.3.</strong> Running Code on Cleanup with the Drop Trait</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-04-rc.html"><strong aria-hidden="true">15.4.</strong> Rc<T>, the Reference Counted Smart Pointer</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-05-interior-mutability.html"><strong aria-hidden="true">15.5.</strong> RefCell<T> and the Interior Mutability Pattern</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch15-06-reference-cycles.html"><strong aria-hidden="true">15.6.</strong> Reference Cycles Can Leak Memory</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch16-00-concurrency.html"><strong aria-hidden="true">16.</strong> Fearless Concurrency</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch16-01-threads.html"><strong aria-hidden="true">16.1.</strong> Using Threads to Run Code Simultaneously</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch16-02-message-passing.html"><strong aria-hidden="true">16.2.</strong> Transfer Data Between Threads with Message Passing</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch16-03-shared-state.html"><strong aria-hidden="true">16.3.</strong> Shared-State Concurrency</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch16-04-extensible-concurrency-sync-and-send.html"><strong aria-hidden="true">16.4.</strong> Extensible Concurrency with Send and Sync</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-00-async-await.html"><strong aria-hidden="true">17.</strong> Fundamentals of Asynchronous Programming: Async, Await, Futures, and Streams</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-01-futures-and-syntax.html"><strong aria-hidden="true">17.1.</strong> Futures and the Async Syntax</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-02-concurrency-with-async.html"><strong aria-hidden="true">17.2.</strong> Applying Concurrency with Async</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-03-more-futures.html"><strong aria-hidden="true">17.3.</strong> Working With Any Number of Futures</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-04-streams.html"><strong aria-hidden="true">17.4.</strong> Streams: Futures in Sequence</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-05-traits-for-async.html"><strong aria-hidden="true">17.5.</strong> A Closer Look at the Traits for Async</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch17-06-futures-tasks-threads.html"><strong aria-hidden="true">17.6.</strong> Futures, Tasks, and Threads</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch18-00-oop.html"><strong aria-hidden="true">18.</strong> Object Oriented Programming Features</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch18-01-what-is-oo.html"><strong aria-hidden="true">18.1.</strong> Characteristics of Object-Oriented Languages</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch18-02-trait-objects.html"><strong aria-hidden="true">18.2.</strong> Using Trait Objects to Abstract over Shared Behavior</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch18-03-oo-design-patterns.html"><strong aria-hidden="true">18.3.</strong> Implementing an Object-Oriented Design Pattern</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch19-00-patterns.html"><strong aria-hidden="true">19.</strong> Patterns and Matching</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch19-01-all-the-places-for-patterns.html"><strong aria-hidden="true">19.1.</strong> All the Places Patterns Can Be Used</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch19-02-refutability.html"><strong aria-hidden="true">19.2.</strong> Refutability: Whether a Pattern Might Fail to Match</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch19-03-pattern-syntax.html"><strong aria-hidden="true">19.3.</strong> Pattern Syntax</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-00-advanced-features.html"><strong aria-hidden="true">20.</strong> Advanced Features</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-01-unsafe-rust.html"><strong aria-hidden="true">20.1.</strong> Unsafe Rust</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-02-advanced-traits.html"><strong aria-hidden="true">20.2.</strong> Advanced Traits</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-03-advanced-types.html"><strong aria-hidden="true">20.3.</strong> Advanced Types</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-04-advanced-functions-and-closures.html"><strong aria-hidden="true">20.4.</strong> Advanced Functions and Closures</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch20-05-macros.html"><strong aria-hidden="true">20.5.</strong> Macros</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch21-00-final-project-a-web-server.html"><strong aria-hidden="true">21.</strong> Final Project: Building a Multithreaded Web Server</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch21-01-single-threaded.html"><strong aria-hidden="true">21.1.</strong> Building a Single-Threaded Web Server</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch21-02-multithreaded.html"><strong aria-hidden="true">21.2.</strong> From Single-Threaded to Multithreaded Server</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="ch21-03-graceful-shutdown-and-cleanup.html"><strong aria-hidden="true">21.3.</strong> Graceful Shutdown and Cleanup</a></span></li></ol><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-00.html"><strong aria-hidden="true">22.</strong> Appendix</a></span><ol class="section"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-01-keywords.html"><strong aria-hidden="true">22.1.</strong> A - Keywords</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-02-operators.html"><strong aria-hidden="true">22.2.</strong> B - Operators and Symbols</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-03-derivable-traits.html"><strong aria-hidden="true">22.3.</strong> C - Derivable Traits</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-04-useful-development-tools.html"><strong aria-hidden="true">22.4.</strong> D - Useful Development Tools</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-05-editions.html"><strong aria-hidden="true">22.5.</strong> E - Editions</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-06-translation.html"><strong aria-hidden="true">22.6.</strong> F - Translations of the Book</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="appendix-07-nightly-rust.html"><strong aria-hidden="true">22.7.</strong> G - How Rust is Made and “Nightly Rust”</a></span></li></ol></li></ol>';
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// Support for dynamically adding headers to the sidebar.
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(function() {
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// This is used to detect which direction the page has scrolled since the
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// last scroll event.
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let lastKnownScrollPosition = 0;
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// This is the threshold in px from the top of the screen where it will
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// consider a header the "current" header when scrolling down.
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const defaultDownThreshold = 150;
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// Same as defaultDownThreshold, except when scrolling up.
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const defaultUpThreshold = 300;
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// The threshold is a virtual horizontal line on the screen where it
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// considers the "current" header to be above the line. The threshold is
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// modified dynamically to handle headers that are near the bottom of the
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// screen, and to slightly offset the behavior when scrolling up vs down.
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let threshold = defaultDownThreshold;
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// This is used to disable updates while scrolling. This is needed when
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// clicking the header in the sidebar, which triggers a scroll event. It
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// is somewhat finicky to detect when the scroll has finished, so this
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// uses a relatively dumb system of disabling scroll updates for a short
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// time after the click.
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let disableScroll = false;
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// Array of header elements on the page.
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let headers;
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// Array of li elements that are initially collapsed headers in the sidebar.
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// I'm not sure why eslint seems to have a false positive here.
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// eslint-disable-next-line prefer-const
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let headerToggles = [];
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// This is a debugging tool for the threshold which you can enable in the console.
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let thresholdDebug = false;
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// Updates the threshold based on the scroll position.
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function updateThreshold() {
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const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
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const windowHeight = window.innerHeight;
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const documentHeight = document.documentElement.scrollHeight;
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// The number of pixels below the viewport, at most documentHeight.
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// This is used to push the threshold down to the bottom of the page
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// as the user scrolls towards the bottom.
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const pixelsBelow = Math.max(0, documentHeight - (scrollTop + windowHeight));
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// The number of pixels above the viewport, at least defaultDownThreshold.
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// Similar to pixelsBelow, this is used to push the threshold back towards
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// the top when reaching the top of the page.
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const pixelsAbove = Math.max(0, defaultDownThreshold - scrollTop);
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// How much the threshold should be offset once it gets close to the
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// bottom of the page.
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const bottomAdd = Math.max(0, windowHeight - pixelsBelow - defaultDownThreshold);
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let adjustedBottomAdd = bottomAdd;
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// Adjusts bottomAdd for a small document. The calculation above
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// assumes the document is at least twice the windowheight in size. If
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// it is less than that, then bottomAdd needs to be shrunk
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// proportional to the difference in size.
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if (documentHeight < windowHeight * 2) {
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const maxPixelsBelow = documentHeight - windowHeight;
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const t = 1 - pixelsBelow / Math.max(1, maxPixelsBelow);
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const clamp = Math.max(0, Math.min(1, t));
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adjustedBottomAdd *= clamp;
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}
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let scrollingDown = true;
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if (scrollTop < lastKnownScrollPosition) {
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scrollingDown = false;
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}
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if (scrollingDown) {
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// When scrolling down, move the threshold up towards the default
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// downwards threshold position. If near the bottom of the page,
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// adjustedBottomAdd will offset the threshold towards the bottom
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// of the page.
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const amountScrolledDown = scrollTop - lastKnownScrollPosition;
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const adjustedDefault = defaultDownThreshold + adjustedBottomAdd;
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threshold = Math.max(adjustedDefault, threshold - amountScrolledDown);
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} else {
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// When scrolling up, move the threshold down towards the default
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// upwards threshold position. If near the bottom of the page,
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// quickly transition the threshold back up where it normally
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// belongs.
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const amountScrolledUp = lastKnownScrollPosition - scrollTop;
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const adjustedDefault = defaultUpThreshold - pixelsAbove
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+ Math.max(0, adjustedBottomAdd - defaultDownThreshold);
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threshold = Math.min(adjustedDefault, threshold + amountScrolledUp);
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}
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if (documentHeight <= windowHeight) {
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threshold = 0;
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}
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if (thresholdDebug) {
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const id = 'mdbook-threshold-debug-data';
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let data = document.getElementById(id);
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if (data === null) {
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data = document.createElement('div');
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data.id = id;
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data.style.cssText = `
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position: fixed;
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top: 50px;
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right: 10px;
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background-color: 0xeeeeee;
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z-index: 9999;
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pointer-events: none;
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`;
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document.body.appendChild(data);
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}
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data.innerHTML = `
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<table>
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<tr><td>documentHeight</td><td>${documentHeight.toFixed(1)}</td></tr>
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<tr><td>windowHeight</td><td>${windowHeight.toFixed(1)}</td></tr>
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<tr><td>scrollTop</td><td>${scrollTop.toFixed(1)}</td></tr>
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<tr><td>pixelsAbove</td><td>${pixelsAbove.toFixed(1)}</td></tr>
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<tr><td>pixelsBelow</td><td>${pixelsBelow.toFixed(1)}</td></tr>
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<tr><td>bottomAdd</td><td>${bottomAdd.toFixed(1)}</td></tr>
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<tr><td>adjustedBottomAdd</td><td>${adjustedBottomAdd.toFixed(1)}</td></tr>
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<tr><td>scrollingDown</td><td>${scrollingDown}</td></tr>
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<tr><td>threshold</td><td>${threshold.toFixed(1)}</td></tr>
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</table>
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`;
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drawDebugLine();
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}
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lastKnownScrollPosition = scrollTop;
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}
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function drawDebugLine() {
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if (!document.body) {
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return;
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}
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const id = 'mdbook-threshold-debug-line';
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const existingLine = document.getElementById(id);
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if (existingLine) {
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existingLine.remove();
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}
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const line = document.createElement('div');
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line.id = id;
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line.style.cssText = `
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position: fixed;
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top: ${threshold}px;
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left: 0;
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width: 100vw;
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height: 2px;
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background-color: red;
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z-index: 9999;
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pointer-events: none;
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`;
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document.body.appendChild(line);
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}
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function mdbookEnableThresholdDebug() {
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thresholdDebug = true;
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updateThreshold();
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drawDebugLine();
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}
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window.mdbookEnableThresholdDebug = mdbookEnableThresholdDebug;
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// Updates which headers in the sidebar should be expanded. If the current
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// header is inside a collapsed group, then it, and all its parents should
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// be expanded.
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function updateHeaderExpanded(currentA) {
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// Add expanded to all header-item li ancestors.
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let current = currentA.parentElement;
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while (current) {
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if (current.tagName === 'LI' && current.classList.contains('header-item')) {
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current.classList.add('expanded');
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}
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current = current.parentElement;
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}
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}
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// Updates which header is marked as the "current" header in the sidebar.
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// This is done with a virtual Y threshold, where headers at or below
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// that line will be considered the current one.
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function updateCurrentHeader() {
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if (!headers || !headers.length) {
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return;
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}
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// Reset the classes, which will be rebuilt below.
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const els = document.getElementsByClassName('current-header');
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for (const el of els) {
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el.classList.remove('current-header');
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}
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for (const toggle of headerToggles) {
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toggle.classList.remove('expanded');
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}
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// Find the last header that is above the threshold.
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let lastHeader = null;
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for (const header of headers) {
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const rect = header.getBoundingClientRect();
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if (rect.top <= threshold) {
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lastHeader = header;
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} else {
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break;
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}
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}
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if (lastHeader === null) {
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lastHeader = headers[0];
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const rect = lastHeader.getBoundingClientRect();
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const windowHeight = window.innerHeight;
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if (rect.top >= windowHeight) {
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return;
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}
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}
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// Get the anchor in the summary.
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const href = '#' + lastHeader.id;
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const a = [...document.querySelectorAll('.header-in-summary')]
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.find(element => element.getAttribute('href') === href);
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if (!a) {
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return;
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}
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a.classList.add('current-header');
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updateHeaderExpanded(a);
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}
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// Updates which header is "current" based on the threshold line.
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function reloadCurrentHeader() {
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if (disableScroll) {
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return;
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}
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updateThreshold();
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updateCurrentHeader();
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}
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// When clicking on a header in the sidebar, this adjusts the threshold so
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// that it is located next to the header. This is so that header becomes
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// "current".
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function headerThresholdClick(event) {
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// See disableScroll description why this is done.
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disableScroll = true;
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setTimeout(() => {
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disableScroll = false;
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}, 100);
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// requestAnimationFrame is used to delay the update of the "current"
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// header until after the scroll is done, and the header is in the new
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// position.
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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// Closest is needed because if it has child elements like <code>.
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const a = event.target.closest('a');
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const href = a.getAttribute('href');
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const targetId = href.substring(1);
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const targetElement = document.getElementById(targetId);
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if (targetElement) {
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threshold = targetElement.getBoundingClientRect().bottom;
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updateCurrentHeader();
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}
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});
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});
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}
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// Takes the nodes from the given head and copies them over to the
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// destination, along with some filtering.
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function filterHeader(source, dest) {
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const clone = source.cloneNode(true);
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clone.querySelectorAll('mark').forEach(mark => {
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mark.replaceWith(...mark.childNodes);
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});
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dest.append(...clone.childNodes);
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}
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// Scans page for headers and adds them to the sidebar.
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document.addEventListener('DOMContentLoaded', function() {
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const activeSection = document.querySelector('#mdbook-sidebar .active');
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if (activeSection === null) {
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return;
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}
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const main = document.getElementsByTagName('main')[0];
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headers = Array.from(main.querySelectorAll('h2, h3, h4, h5, h6'))
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.filter(h => h.id !== '' && h.children.length && h.children[0].tagName === 'A');
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if (headers.length === 0) {
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return;
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}
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// Build a tree of headers in the sidebar.
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const stack = [];
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const firstLevel = parseInt(headers[0].tagName.charAt(1));
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for (let i = 1; i < firstLevel; i++) {
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const ol = document.createElement('ol');
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ol.classList.add('section');
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if (stack.length > 0) {
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stack[stack.length - 1].ol.appendChild(ol);
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}
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stack.push({level: i + 1, ol: ol});
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}
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// The level where it will start folding deeply nested headers.
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const foldLevel = 3;
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for (let i = 0; i < headers.length; i++) {
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const header = headers[i];
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const level = parseInt(header.tagName.charAt(1));
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const currentLevel = stack[stack.length - 1].level;
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if (level > currentLevel) {
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// Begin nesting to this level.
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for (let nextLevel = currentLevel + 1; nextLevel <= level; nextLevel++) {
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const ol = document.createElement('ol');
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ol.classList.add('section');
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const last = stack[stack.length - 1];
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const lastChild = last.ol.lastChild;
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// Handle the case where jumping more than one nesting
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// level, which doesn't have a list item to place this new
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// list inside of.
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if (lastChild) {
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lastChild.appendChild(ol);
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} else {
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last.ol.appendChild(ol);
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}
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stack.push({level: nextLevel, ol: ol});
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}
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} else if (level < currentLevel) {
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while (stack.length > 1 && stack[stack.length - 1].level > level) {
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stack.pop();
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}
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}
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const li = document.createElement('li');
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li.classList.add('header-item');
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li.classList.add('expanded');
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if (level < foldLevel) {
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li.classList.add('expanded');
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}
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const span = document.createElement('span');
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span.classList.add('chapter-link-wrapper');
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const a = document.createElement('a');
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span.appendChild(a);
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a.href = '#' + header.id;
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a.classList.add('header-in-summary');
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filterHeader(header.children[0], a);
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a.addEventListener('click', headerThresholdClick);
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const nextHeader = headers[i + 1];
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if (nextHeader !== undefined) {
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const nextLevel = parseInt(nextHeader.tagName.charAt(1));
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if (nextLevel > level && level >= foldLevel) {
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const toggle = document.createElement('a');
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toggle.classList.add('chapter-fold-toggle');
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toggle.classList.add('header-toggle');
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toggle.addEventListener('click', () => {
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li.classList.toggle('expanded');
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});
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const toggleDiv = document.createElement('div');
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toggleDiv.textContent = '❱';
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toggle.appendChild(toggleDiv);
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span.appendChild(toggle);
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headerToggles.push(li);
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}
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}
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li.appendChild(span);
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const currentParent = stack[stack.length - 1];
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currentParent.ol.appendChild(li);
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}
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const onThisPage = document.createElement('div');
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onThisPage.classList.add('on-this-page');
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onThisPage.append(stack[0].ol);
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const activeItemSpan = activeSection.parentElement;
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activeItemSpan.after(onThisPage);
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});
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document.addEventListener('DOMContentLoaded', reloadCurrentHeader);
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document.addEventListener('scroll', reloadCurrentHeader, { passive: true });
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})();
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