presentazione-papero/plugin/highlight/highlight.js

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/*! highlight.js v9.11.0 | BSD3 License | git.io/hljslicense */
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// START CUSTOM REVEAL.JS INTEGRATION
var RevealHighlight = (function() {
// Function to perform a better "data-trim" on code snippets
// Will slice an indentation amount on each line of the snippet (amount based on the line having the lowest indentation length)
function betterTrim(snippetEl) {
// Helper functions
function trimLeft(val) {
// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
return val.replace(/^[\s\uFEFF\xA0]+/g, '');
}
function trimLineBreaks(input) {
var lines = input.split('\n');
// Trim line-breaks from the beginning
for (var i = 0; i < lines.length; i++) {
if (lines[i].trim() === '') {
lines.splice(i--, 1);
} else break;
}
// Trim line-breaks from the end
for (var i = lines.length-1; i >= 0; i--) {
if (lines[i].trim() === '') {
lines.splice(i, 1);
} else break;
}
return lines.join('\n');
}
// Main function for betterTrim()
return (function(snippetEl) {
var content = trimLineBreaks(snippetEl.innerHTML);
var lines = content.split('\n');
// Calculate the minimum amount to remove on each line start of the snippet (can be 0)
var pad = lines.reduce(function(acc, line) {
if (line.length > 0 && trimLeft(line).length > 0 && acc > line.length - trimLeft(line).length) {
return line.length - trimLeft(line).length;
}
return acc;
}, Number.POSITIVE_INFINITY);
// Slice each line with this amount
return lines.map(function(line, index) {
return line.slice(pad);
})
.join('\n');
})(snippetEl);
}
return {
init: function() {
var hljs_nodes = document.querySelectorAll( 'pre code' );
for( var i = 0, len = hljs_nodes.length; i < len; i++ ) {
var element = hljs_nodes[i];
// trim whitespace if data-trim attribute is present
if( element.hasAttribute( 'data-trim' ) && typeof element.innerHTML.trim === 'function' ) {
element.innerHTML = betterTrim(element);
}
// Now escape html unless prevented by author
if( ! element.hasAttribute( 'data-noescape' )) {
element.innerHTML = element.innerHTML.replace(/</g,"&lt;").replace(/>/g,"&gt;");
}
// re-highlight when focus is lost (for edited code)
element.addEventListener( 'focusout', function( event ) {
hljs.highlightBlock( event.currentTarget );
}, false );
}
hljs.initHighlightingOnLoad();
// lofi xbrowser Promise.resolve()
return { then: function( resolve ) { resolve(); }};
}
}
})();
Reveal.registerPlugin( 'highlight', RevealHighlight );
// END CUSTOM REVEAL.JS INTEGRATION