mdBook/editor.js

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JavaScript
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"use strict";
window.editors = [];
(function(editors) {
if (typeof(ace) === 'undefined' || !ace) {
return;
}
Array.from(document.querySelectorAll('.editable')).forEach(function(editable) {
let display_line_numbers = window.playground_line_numbers || false;
let editor = ace.edit(editable);
editor.setOptions({
highlightActiveLine: false,
showPrintMargin: false,
showLineNumbers: display_line_numbers,
showGutter: display_line_numbers,
maxLines: Infinity,
fontSize: "0.875em" // please adjust the font size of the code in general.css
});
editor.$blockScrolling = Infinity;
editor.getSession().setMode("ace/mode/rust");
editor.originalCode = editor.getValue();
editors.push(editor);
});
})(window.editors);