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@@ -0,0 +1,679 @@
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+"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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+
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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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+
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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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+ }
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+
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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) { }
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+ 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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+ }
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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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+
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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";
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+ } 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";
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+ } 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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+
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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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+
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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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+ });
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+ }
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+
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+ var previousTheme = get_theme();
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+
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+ if (store) {
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+ try { localStorage.setItem('mdbook-theme', theme); } catch (e) { }
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+ }
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+
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+ html.classList.remove(previousTheme);
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+ html.classList.add(theme);
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+ }
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+
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+ // Set theme
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+ var theme = get_theme();
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+
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+ set_theme(theme, false);
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+
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+ themeToggleButton.addEventListener('click', function () {
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+ if (themePopup.style.display === 'block') {
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+ hideThemes();
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+ } else {
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+ showThemes();
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+ }
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+ });
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+
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+ themePopup.addEventListener('click', function (e) {
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+ var theme;
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+ if (e.target.className === "theme") {
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+ theme = e.target.id;
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+ } else if (e.target.parentElement.className === "theme") {
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+ theme = e.target.parentElement.id;
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+ } else {
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+ return;
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+ }
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+ set_theme(theme);
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+ });
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+
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+ themePopup.addEventListener('focusout', function(e) {
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+ // e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
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+ if (!!e.relatedTarget && !themeToggleButton.contains(e.relatedTarget) && !themePopup.contains(e.relatedTarget)) {
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+ hideThemes();
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+ }
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+ });
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+
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+ // Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang/mdBook/issues/628
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+ document.addEventListener('click', function(e) {
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+ if (themePopup.style.display === 'block' && !themeToggleButton.contains(e.target) && !themePopup.contains(e.target)) {
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+ hideThemes();
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+ }
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+ });
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+
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+ document.addEventListener('keydown', function (e) {
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+ if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
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+ if (!themePopup.contains(e.target)) { return; }
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+
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+ switch (e.key) {
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+ case 'Escape':
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+ e.preventDefault();
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+ 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 });
|
|
|
+ })();
|
|
|
+})();
|
bhikkhu-kosalla-china
