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			680 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			680 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
| "use strict";
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| 
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| // Fix back button cache problem
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| window.onunload = function () { };
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| 
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| // Global variable, shared between modules
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| function playground_text(playground) {
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|     let code_block = playground.querySelector("code");
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| 
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|     if (window.ace && code_block.classList.contains("editable")) {
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|         let editor = window.ace.edit(code_block);
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|         return editor.getValue();
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|     } else {
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|         return code_block.textContent;
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|     }
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| }
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| 
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| (function codeSnippets() {
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|     function fetch_with_timeout(url, options, timeout = 6000) {
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|         return Promise.race([
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|             fetch(url, options),
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|             new Promise((_, reject) => setTimeout(() => reject(new Error('timeout')), timeout))
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|         ]);
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|     }
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| 
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|     var playgrounds = Array.from(document.querySelectorAll(".playground"));
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|     if (playgrounds.length > 0) {
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|         fetch_with_timeout("https://play.rust-lang.org/meta/crates", {
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|             headers: {
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|                 'Content-Type': "application/json",
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|             },
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|             method: 'POST',
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|             mode: 'cors',
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|         })
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|         .then(response => response.json())
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|         .then(response => {
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|             // get list of crates available in the rust playground
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|             let playground_crates = response.crates.map(item => item["id"]);
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|             playgrounds.forEach(block => handle_crate_list_update(block, playground_crates));
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|         });
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|     }
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| 
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|     function handle_crate_list_update(playground_block, playground_crates) {
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|         // update the play buttons after receiving the response
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|         update_play_button(playground_block, playground_crates);
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| 
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|         // and install on change listener to dynamically update ACE editors
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|         if (window.ace) {
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|             let code_block = playground_block.querySelector("code");
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|             if (code_block.classList.contains("editable")) {
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|                 let editor = window.ace.edit(code_block);
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|                 editor.addEventListener("change", function (e) {
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|                     update_play_button(playground_block, playground_crates);
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|                 });
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|                 // add Ctrl-Enter command to execute rust code
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|                 editor.commands.addCommand({
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|                     name: "run",
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|                     bindKey: {
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|                         win: "Ctrl-Enter",
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|                         mac: "Ctrl-Enter"
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|                     },
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|                     exec: _editor => run_rust_code(playground_block)
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|                 });
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|             }
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|         }
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|     }
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| 
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|     // updates the visibility of play button based on `no_run` class and
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|     // used crates vs ones available on http://play.rust-lang.org
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|     function update_play_button(pre_block, playground_crates) {
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|         var play_button = pre_block.querySelector(".play-button");
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| 
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|         // skip if code is `no_run`
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|         if (pre_block.querySelector('code').classList.contains("no_run")) {
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|             play_button.classList.add("hidden");
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|             return;
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|         }
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| 
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|         // get list of `extern crate`'s from snippet
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|         var txt = playground_text(pre_block);
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|         var re = /extern\s+crate\s+([a-zA-Z_0-9]+)\s*;/g;
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|         var snippet_crates = [];
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|         var item;
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|         while (item = re.exec(txt)) {
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|             snippet_crates.push(item[1]);
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|         }
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| 
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|         // check if all used crates are available on play.rust-lang.org
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|         var all_available = snippet_crates.every(function (elem) {
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|             return playground_crates.indexOf(elem) > -1;
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|         });
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| 
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|         if (all_available) {
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|             play_button.classList.remove("hidden");
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|         } else {
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|             play_button.classList.add("hidden");
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|         }
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|     }
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| 
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|     function run_rust_code(code_block) {
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|         var result_block = code_block.querySelector(".result");
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|         if (!result_block) {
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|             result_block = document.createElement('code');
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|             result_block.className = 'result hljs language-bash';
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| 
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|             code_block.append(result_block);
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|         }
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| 
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|         let text = playground_text(code_block);
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|         let classes = code_block.querySelector('code').classList;
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|         let edition = "2015";
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|         if(classes.contains("edition2018")) {
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|             edition = "2018";
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|         } else if(classes.contains("edition2021")) {
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|             edition = "2021";
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|         }
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|         var params = {
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|             version: "stable",
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|             optimize: "0",
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|             code: text,
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|             edition: edition
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|         };
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| 
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|         if (text.indexOf("#![feature") !== -1) {
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|             params.version = "nightly";
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|         }
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| 
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|         result_block.innerText = "Running...";
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| 
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|         fetch_with_timeout("https://play.rust-lang.org/evaluate.json", {
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|             headers: {
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|                 'Content-Type': "application/json",
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|             },
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|             method: 'POST',
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|             mode: 'cors',
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|             body: JSON.stringify(params)
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|         })
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|         .then(response => response.json())
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|         .then(response => {
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|             if (response.result.trim() === '') {
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|                 result_block.innerText = "No output";
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|                 result_block.classList.add("result-no-output");
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|             } else {
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|                 result_block.innerText = response.result;
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|                 result_block.classList.remove("result-no-output");
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|             }
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|         })
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|         .catch(error => result_block.innerText = "Playground Communication: " + error.message);
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|     }
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| 
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|     // Syntax highlighting Configuration
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|     hljs.configure({
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|         tabReplace: '    ', // 4 spaces
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|         languages: [],      // Languages used for auto-detection
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|     });
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| 
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|     let code_nodes = Array
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|         .from(document.querySelectorAll('code'))
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|         // Don't highlight `inline code` blocks in headers.
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|         .filter(function (node) {return !node.parentElement.classList.contains("header"); });
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| 
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|     if (window.ace) {
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|         // language-rust class needs to be removed for editable
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|         // blocks or highlightjs will capture events
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|         code_nodes
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|             .filter(function (node) {return node.classList.contains("editable"); })
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|             .forEach(function (block) { block.classList.remove('language-rust'); });
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| 
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|         Array
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|         code_nodes
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|             .filter(function (node) {return !node.classList.contains("editable"); })
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|             .forEach(function (block) { hljs.highlightBlock(block); });
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|     } else {
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|         code_nodes.forEach(function (block) { hljs.highlightBlock(block); });
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|     }
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| 
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|     // Adding the hljs class gives code blocks the color css
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|     // even if highlighting doesn't apply
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|     code_nodes.forEach(function (block) { block.classList.add('hljs'); });
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| 
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|     Array.from(document.querySelectorAll("code.language-rust")).forEach(function (block) {
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| 
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|         var lines = Array.from(block.querySelectorAll('.boring'));
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|         // If no lines were hidden, return
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|         if (!lines.length) { return; }
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|         block.classList.add("hide-boring");
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| 
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|         var buttons = document.createElement('div');
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|         buttons.className = 'buttons';
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|         buttons.innerHTML = "<button class=\"fa fa-eye\" title=\"Show hidden lines\" aria-label=\"Show hidden lines\"></button>";
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| 
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|         // add expand button
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|         var pre_block = block.parentNode;
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|         pre_block.insertBefore(buttons, pre_block.firstChild);
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| 
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|         pre_block.querySelector('.buttons').addEventListener('click', function (e) {
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|             if (e.target.classList.contains('fa-eye')) {
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|                 e.target.classList.remove('fa-eye');
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|                 e.target.classList.add('fa-eye-slash');
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|                 e.target.title = 'Hide lines';
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|                 e.target.setAttribute('aria-label', e.target.title);
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| 
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|                 block.classList.remove('hide-boring');
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|             } else if (e.target.classList.contains('fa-eye-slash')) {
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|                 e.target.classList.remove('fa-eye-slash');
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|                 e.target.classList.add('fa-eye');
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|                 e.target.title = 'Show hidden lines';
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|                 e.target.setAttribute('aria-label', e.target.title);
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| 
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|                 block.classList.add('hide-boring');
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|             }
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|         });
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|     });
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| 
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|     if (window.playground_copyable) {
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|         Array.from(document.querySelectorAll('pre code')).forEach(function (block) {
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|             var pre_block = block.parentNode;
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|             if (!pre_block.classList.contains('playground')) {
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|                 var buttons = pre_block.querySelector(".buttons");
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|                 if (!buttons) {
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|                     buttons = document.createElement('div');
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|                     buttons.className = 'buttons';
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|                     pre_block.insertBefore(buttons, pre_block.firstChild);
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|                 }
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| 
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|                 var clipButton = document.createElement('button');
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|                 clipButton.className = 'fa fa-copy clip-button';
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|                 clipButton.title = 'Copy to clipboard';
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|                 clipButton.setAttribute('aria-label', clipButton.title);
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|                 clipButton.innerHTML = '<i class=\"tooltiptext\"></i>';
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| 
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|                 buttons.insertBefore(clipButton, buttons.firstChild);
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|             }
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|         });
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|     }
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| 
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|     // Process playground code blocks
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|     Array.from(document.querySelectorAll(".playground")).forEach(function (pre_block) {
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|         // Add play button
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|         var buttons = pre_block.querySelector(".buttons");
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|         if (!buttons) {
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|             buttons = document.createElement('div');
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|             buttons.className = 'buttons';
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|             pre_block.insertBefore(buttons, pre_block.firstChild);
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|         }
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| 
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|         var runCodeButton = document.createElement('button');
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|         runCodeButton.className = 'fa fa-play play-button';
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|         runCodeButton.hidden = true;
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|         runCodeButton.title = 'Run this code';
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|         runCodeButton.setAttribute('aria-label', runCodeButton.title);
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| 
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|         buttons.insertBefore(runCodeButton, buttons.firstChild);
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|         runCodeButton.addEventListener('click', function (e) {
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|             run_rust_code(pre_block);
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|         });
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| 
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|         if (window.playground_copyable) {
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|             var copyCodeClipboardButton = document.createElement('button');
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|             copyCodeClipboardButton.className = 'fa fa-copy clip-button';
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|             copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
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|             copyCodeClipboardButton.title = 'Copy to clipboard';
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|             copyCodeClipboardButton.setAttribute('aria-label', copyCodeClipboardButton.title);
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| 
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|             buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);
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|         }
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| 
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|         let code_block = pre_block.querySelector("code");
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|         if (window.ace && code_block.classList.contains("editable")) {
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|             var undoChangesButton = document.createElement('button');
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|             undoChangesButton.className = 'fa fa-history reset-button';
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|             undoChangesButton.title = 'Undo changes';
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|             undoChangesButton.setAttribute('aria-label', undoChangesButton.title);
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| 
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|             buttons.insertBefore(undoChangesButton, buttons.firstChild);
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| 
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|             undoChangesButton.addEventListener('click', function () {
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|                 let editor = window.ace.edit(code_block);
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|                 editor.setValue(editor.originalCode);
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|                 editor.clearSelection();
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|             });
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|         }
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|     });
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| })();
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| 
 | |
| (function themes() {
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|     var html = document.querySelector('html');
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|     var themeToggleButton = document.getElementById('theme-toggle');
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|     var themePopup = document.getElementById('theme-list');
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|     var themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
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|     var stylesheets = {
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|         ayuHighlight: document.querySelector("[href$='ayu-highlight.css']"),
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|         tomorrowNight: document.querySelector("[href$='tomorrow-night.css']"),
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|         highlight: document.querySelector("[href$='highlight.css']"),
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|     };
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| 
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|     function showThemes() {
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|         themePopup.style.display = 'block';
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|         themeToggleButton.setAttribute('aria-expanded', true);
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|         themePopup.querySelector("button#" + get_theme()).focus();
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|     }
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| 
 | |
|     function hideThemes() {
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|         themePopup.style.display = 'none';
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|         themeToggleButton.setAttribute('aria-expanded', false);
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|         themeToggleButton.focus();
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|     }
 | |
| 
 | |
|     function get_theme() {
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|         var theme;
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|         try { theme = localStorage.getItem('mdbook-theme'); } catch (e) { }
 | |
|         if (theme === null || theme === undefined) {
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|             return default_theme;
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|         } else {
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|             return theme;
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|         }
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|     }
 | |
| 
 | |
|     function set_theme(theme, store = true) {
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|         let ace_theme;
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| 
 | |
|         if (theme == 'coal' || theme == 'navy') {
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|             stylesheets.ayuHighlight.disabled = true;
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|             stylesheets.tomorrowNight.disabled = false;
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|             stylesheets.highlight.disabled = true;
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| 
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|             ace_theme = "ace/theme/tomorrow_night";
 | |
|         } else if (theme == 'ayu') {
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|             stylesheets.ayuHighlight.disabled = false;
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|             stylesheets.tomorrowNight.disabled = true;
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|             stylesheets.highlight.disabled = true;
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|             ace_theme = "ace/theme/tomorrow_night";
 | |
|         } else {
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|             stylesheets.ayuHighlight.disabled = true;
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|             stylesheets.tomorrowNight.disabled = true;
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|             stylesheets.highlight.disabled = false;
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|             ace_theme = "ace/theme/dawn";
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|         }
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| 
 | |
|         setTimeout(function () {
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|             themeColorMetaTag.content = getComputedStyle(document.body).backgroundColor;
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|         }, 1);
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| 
 | |
|         if (window.ace && window.editors) {
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|             window.editors.forEach(function (editor) {
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|                 editor.setTheme(ace_theme);
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|             });
 | |
|         }
 | |
| 
 | |
|         var previousTheme = get_theme();
 | |
| 
 | |
|         if (store) {
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|             try { localStorage.setItem('mdbook-theme', theme); } catch (e) { }
 | |
|         }
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| 
 | |
|         html.classList.remove(previousTheme);
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|         html.classList.add(theme);
 | |
|     }
 | |
| 
 | |
|     // Set theme
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|     var theme = get_theme();
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| 
 | |
|     set_theme(theme, false);
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| 
 | |
|     themeToggleButton.addEventListener('click', function () {
 | |
|         if (themePopup.style.display === 'block') {
 | |
|             hideThemes();
 | |
|         } else {
 | |
|             showThemes();
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|         }
 | |
|     });
 | |
| 
 | |
|     themePopup.addEventListener('click', function (e) {
 | |
|         var theme;
 | |
|         if (e.target.className === "theme") {
 | |
|             theme = e.target.id;
 | |
|         } else if (e.target.parentElement.className === "theme") {
 | |
|             theme = e.target.parentElement.id;
 | |
|         } else {
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|             return;
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|         }
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|         set_theme(theme);
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|     });
 | |
| 
 | |
|     themePopup.addEventListener('focusout', function(e) {
 | |
|         // e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
 | |
|         if (!!e.relatedTarget && !themeToggleButton.contains(e.relatedTarget) && !themePopup.contains(e.relatedTarget)) {
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|             hideThemes();
 | |
|         }
 | |
|     });
 | |
| 
 | |
|     // Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang/mdBook/issues/628
 | |
|     document.addEventListener('click', function(e) {
 | |
|         if (themePopup.style.display === 'block' && !themeToggleButton.contains(e.target) && !themePopup.contains(e.target)) {
 | |
|             hideThemes();
 | |
|         }
 | |
|     });
 | |
| 
 | |
|     document.addEventListener('keydown', function (e) {
 | |
|         if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
 | |
|         if (!themePopup.contains(e.target)) { return; }
 | |
| 
 | |
|         switch (e.key) {
 | |
|             case 'Escape':
 | |
|                 e.preventDefault();
 | |
|                 hideThemes();
 | |
|                 break;
 | |
|             case 'ArrowUp':
 | |
|                 e.preventDefault();
 | |
|                 var li = document.activeElement.parentElement;
 | |
|                 if (li && li.previousElementSibling) {
 | |
|                     li.previousElementSibling.querySelector('button').focus();
 | |
|                 }
 | |
|                 break;
 | |
|             case 'ArrowDown':
 | |
|                 e.preventDefault();
 | |
|                 var li = document.activeElement.parentElement;
 | |
|                 if (li && li.nextElementSibling) {
 | |
|                     li.nextElementSibling.querySelector('button').focus();
 | |
|                 }
 | |
|                 break;
 | |
|             case 'Home':
 | |
|                 e.preventDefault();
 | |
|                 themePopup.querySelector('li:first-child button').focus();
 | |
|                 break;
 | |
|             case 'End':
 | |
|                 e.preventDefault();
 | |
|                 themePopup.querySelector('li:last-child button').focus();
 | |
|                 break;
 | |
|         }
 | |
|     });
 | |
| })();
 | |
| 
 | |
| (function sidebar() {
 | |
|     var html = document.querySelector("html");
 | |
|     var sidebar = document.getElementById("sidebar");
 | |
|     var sidebarLinks = document.querySelectorAll('#sidebar a');
 | |
|     var sidebarToggleButton = document.getElementById("sidebar-toggle");
 | |
|     var sidebarResizeHandle = document.getElementById("sidebar-resize-handle");
 | |
|     var firstContact = null;
 | |
| 
 | |
|     function showSidebar() {
 | |
|         html.classList.remove('sidebar-hidden')
 | |
|         html.classList.add('sidebar-visible');
 | |
|         Array.from(sidebarLinks).forEach(function (link) {
 | |
|             link.setAttribute('tabIndex', 0);
 | |
|         });
 | |
|         sidebarToggleButton.setAttribute('aria-expanded', true);
 | |
|         sidebar.setAttribute('aria-hidden', false);
 | |
|         try { localStorage.setItem('mdbook-sidebar', 'visible'); } catch (e) { }
 | |
|     }
 | |
| 
 | |
| 
 | |
|     var sidebarAnchorToggles = document.querySelectorAll('#sidebar a.toggle');
 | |
| 
 | |
|     function toggleSection(ev) {
 | |
|         ev.currentTarget.parentElement.classList.toggle('expanded');
 | |
|     }
 | |
| 
 | |
|     Array.from(sidebarAnchorToggles).forEach(function (el) {
 | |
|         el.addEventListener('click', toggleSection);
 | |
|     });
 | |
| 
 | |
|     function hideSidebar() {
 | |
|         html.classList.remove('sidebar-visible')
 | |
|         html.classList.add('sidebar-hidden');
 | |
|         Array.from(sidebarLinks).forEach(function (link) {
 | |
|             link.setAttribute('tabIndex', -1);
 | |
|         });
 | |
|         sidebarToggleButton.setAttribute('aria-expanded', false);
 | |
|         sidebar.setAttribute('aria-hidden', true);
 | |
|         try { localStorage.setItem('mdbook-sidebar', 'hidden'); } catch (e) { }
 | |
|     }
 | |
| 
 | |
|     // Toggle sidebar
 | |
|     sidebarToggleButton.addEventListener('click', function sidebarToggle() {
 | |
|         if (html.classList.contains("sidebar-hidden")) {
 | |
|             var current_width = parseInt(
 | |
|                 document.documentElement.style.getPropertyValue('--sidebar-width'), 10);
 | |
|             if (current_width < 150) {
 | |
|                 document.documentElement.style.setProperty('--sidebar-width', '150px');
 | |
|             }
 | |
|             showSidebar();
 | |
|         } else if (html.classList.contains("sidebar-visible")) {
 | |
|             hideSidebar();
 | |
|         } else {
 | |
|             if (getComputedStyle(sidebar)['transform'] === 'none') {
 | |
|                 hideSidebar();
 | |
|             } else {
 | |
|                 showSidebar();
 | |
|             }
 | |
|         }
 | |
|     });
 | |
| 
 | |
|     sidebarResizeHandle.addEventListener('mousedown', initResize, false);
 | |
| 
 | |
|     function initResize(e) {
 | |
|         window.addEventListener('mousemove', resize, false);
 | |
|         window.addEventListener('mouseup', stopResize, false);
 | |
|         html.classList.add('sidebar-resizing');
 | |
|     }
 | |
|     function resize(e) {
 | |
|         var pos = (e.clientX - sidebar.offsetLeft);
 | |
|         if (pos < 20) {
 | |
|             hideSidebar();
 | |
|         } else {
 | |
|             if (html.classList.contains("sidebar-hidden")) {
 | |
|                 showSidebar();
 | |
|             }
 | |
|             pos = Math.min(pos, window.innerWidth - 100);
 | |
|             document.documentElement.style.setProperty('--sidebar-width', pos + 'px');
 | |
|         }
 | |
|     }
 | |
|     //on mouseup remove windows functions mousemove & mouseup
 | |
|     function stopResize(e) {
 | |
|         html.classList.remove('sidebar-resizing');
 | |
|         window.removeEventListener('mousemove', resize, false);
 | |
|         window.removeEventListener('mouseup', stopResize, false);
 | |
|     }
 | |
| 
 | |
|     document.addEventListener('touchstart', function (e) {
 | |
|         firstContact = {
 | |
|             x: e.touches[0].clientX,
 | |
|             time: Date.now()
 | |
|         };
 | |
|     }, { passive: true });
 | |
| 
 | |
|     document.addEventListener('touchmove', function (e) {
 | |
|         if (!firstContact)
 | |
|             return;
 | |
| 
 | |
|         var curX = e.touches[0].clientX;
 | |
|         var xDiff = curX - firstContact.x,
 | |
|             tDiff = Date.now() - firstContact.time;
 | |
| 
 | |
|         if (tDiff < 250 && Math.abs(xDiff) >= 150) {
 | |
|             if (xDiff >= 0 && firstContact.x < Math.min(document.body.clientWidth * 0.25, 300))
 | |
|                 showSidebar();
 | |
|             else if (xDiff < 0 && curX < 300)
 | |
|                 hideSidebar();
 | |
| 
 | |
|             firstContact = null;
 | |
|         }
 | |
|     }, { passive: true });
 | |
| 
 | |
|     // Scroll sidebar to current active section
 | |
|     var activeSection = document.getElementById("sidebar").querySelector(".active");
 | |
|     if (activeSection) {
 | |
|         // https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
 | |
|         activeSection.scrollIntoView({ block: 'center' });
 | |
|     }
 | |
| })();
 | |
| 
 | |
| (function chapterNavigation() {
 | |
|     document.addEventListener('keydown', function (e) {
 | |
|         if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
 | |
|         if (window.search && window.search.hasFocus()) { return; }
 | |
| 
 | |
|         switch (e.key) {
 | |
|             case 'ArrowRight':
 | |
|                 e.preventDefault();
 | |
|                 var nextButton = document.querySelector('.nav-chapters.next');
 | |
|                 if (nextButton) {
 | |
|                     window.location.href = nextButton.href;
 | |
|                 }
 | |
|                 break;
 | |
|             case 'ArrowLeft':
 | |
|                 e.preventDefault();
 | |
|                 var previousButton = document.querySelector('.nav-chapters.previous');
 | |
|                 if (previousButton) {
 | |
|                     window.location.href = previousButton.href;
 | |
|                 }
 | |
|                 break;
 | |
|         }
 | |
|     });
 | |
| })();
 | |
| 
 | |
| (function clipboard() {
 | |
|     var clipButtons = document.querySelectorAll('.clip-button');
 | |
| 
 | |
|     function hideTooltip(elem) {
 | |
|         elem.firstChild.innerText = "";
 | |
|         elem.className = 'fa fa-copy clip-button';
 | |
|     }
 | |
| 
 | |
|     function showTooltip(elem, msg) {
 | |
|         elem.firstChild.innerText = msg;
 | |
|         elem.className = 'fa fa-copy tooltipped';
 | |
|     }
 | |
| 
 | |
|     var clipboardSnippets = new ClipboardJS('.clip-button', {
 | |
|         text: function (trigger) {
 | |
|             hideTooltip(trigger);
 | |
|             let playground = trigger.closest("pre");
 | |
|             return playground_text(playground);
 | |
|         }
 | |
|     });
 | |
| 
 | |
|     Array.from(clipButtons).forEach(function (clipButton) {
 | |
|         clipButton.addEventListener('mouseout', function (e) {
 | |
|             hideTooltip(e.currentTarget);
 | |
|         });
 | |
|     });
 | |
| 
 | |
|     clipboardSnippets.on('success', function (e) {
 | |
|         e.clearSelection();
 | |
|         showTooltip(e.trigger, "Copied!");
 | |
|     });
 | |
| 
 | |
|     clipboardSnippets.on('error', function (e) {
 | |
|         showTooltip(e.trigger, "Clipboard error!");
 | |
|     });
 | |
| })();
 | |
| 
 | |
| (function scrollToTop () {
 | |
|     var menuTitle = document.querySelector('.menu-title');
 | |
| 
 | |
|     menuTitle.addEventListener('click', function () {
 | |
|         document.scrollingElement.scrollTo({ top: 0, behavior: 'smooth' });
 | |
|     });
 | |
| })();
 | |
| 
 | |
| (function controllMenu() {
 | |
|     var menu = document.getElementById('menu-bar');
 | |
| 
 | |
|     (function controllPosition() {
 | |
|         var scrollTop = document.scrollingElement.scrollTop;
 | |
|         var prevScrollTop = scrollTop;
 | |
|         var minMenuY = -menu.clientHeight - 50;
 | |
|         // When the script loads, the page can be at any scroll (e.g. if you reforesh it).
 | |
|         menu.style.top = scrollTop + 'px';
 | |
|         // Same as parseInt(menu.style.top.slice(0, -2), but faster
 | |
|         var topCache = menu.style.top.slice(0, -2);
 | |
|         menu.classList.remove('sticky');
 | |
|         var stickyCache = false; // Same as menu.classList.contains('sticky'), but faster
 | |
|         document.addEventListener('scroll', function () {
 | |
|             scrollTop = Math.max(document.scrollingElement.scrollTop, 0);
 | |
|             // `null` means that it doesn't need to be updated
 | |
|             var nextSticky = null;
 | |
|             var nextTop = null;
 | |
|             var scrollDown = scrollTop > prevScrollTop;
 | |
|             var menuPosAbsoluteY = topCache - scrollTop;
 | |
|             if (scrollDown) {
 | |
|                 nextSticky = false;
 | |
|                 if (menuPosAbsoluteY > 0) {
 | |
|                     nextTop = prevScrollTop;
 | |
|                 }
 | |
|             } else {
 | |
|                 if (menuPosAbsoluteY > 0) {
 | |
|                     nextSticky = true;
 | |
|                 } else if (menuPosAbsoluteY < minMenuY) {
 | |
|                     nextTop = prevScrollTop + minMenuY;
 | |
|                 }
 | |
|             }
 | |
|             if (nextSticky === true && stickyCache === false) {
 | |
|                 menu.classList.add('sticky');
 | |
|                 stickyCache = true;
 | |
|             } else if (nextSticky === false && stickyCache === true) {
 | |
|                 menu.classList.remove('sticky');
 | |
|                 stickyCache = false;
 | |
|             }
 | |
|             if (nextTop !== null) {
 | |
|                 menu.style.top = nextTop + 'px';
 | |
|                 topCache = nextTop;
 | |
|             }
 | |
|             prevScrollTop = scrollTop;
 | |
|         }, { passive: true });
 | |
|     })();
 | |
|     (function controllBorder() {
 | |
|         menu.classList.remove('bordered');
 | |
|         document.addEventListener('scroll', function () {
 | |
|             if (menu.offsetTop === 0) {
 | |
|                 menu.classList.remove('bordered');
 | |
|             } else {
 | |
|                 menu.classList.add('bordered');
 | |
|             }
 | |
|         }, { passive: true });
 | |
|     })();
 | |
| })();
 |