copy-paste-bookmarks/plugin/highlight/highlight.js

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/*! highlight.js v9.11.0 | BSD3 License | git.io/hljslicense */
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/* highlightjs-line-numbers.js 2.6.0 | (C) 2018 Yauheni Pakala | MIT License | github.com/wcoder/highlightjs-line-numbers.js */
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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() {
[].slice.call( document.querySelectorAll( 'pre code' ) ).forEach( function( code ) {
// trim whitespace if data-trim attribute is present
if( code.hasAttribute( 'data-trim' ) && typeof code.innerHTML.trim === 'function' ) {
code.innerHTML = betterTrim(code);
}
// Now escape html unless prevented by author
if( ! code.hasAttribute( 'data-noescape' )) {
code.innerHTML = code.innerHTML.replace(/</g,"&lt;").replace(/>/g,"&gt;");
}
// re-highlight when focus is lost (for edited code)
code.addEventListener( 'focusout', function( event ) {
hljs.highlightBlock( event.currentTarget );
}, false );
RevealHighlight.highlightBlock( code );
} );
// lofi xbrowser Promise.resolve()
return { then: function( resolve ) { resolve(); }};
},
/**
* Highlights a code block. If the <code> node has the
* 'line-numbers' class we also generate slide numbers.
*/
highlightBlock: function( block ) {
hljs.highlightBlock( block );
if( block.classList.contains( 'line-numbers' ) ) {
hljs.lineNumbersBlock( block );
if( block.hasAttribute( 'data-highlight-lines' ) ) {
// hljs.lineNumbersBlock runs async code on the next cycle,
// so we need to do the same to execute after it's done
setTimeout( RevealHighlight.highlightLines.bind( this, block ), 0 )
}
}
},
/**
* Visually emphasize specific lines within a code block.
* This onnly works on blocks with line numbering turned on.
*
* @param {HTMLElement} block a <code> block
* @param {String} [linesToHighlight] The lines that should be
* highlighted in this format:
* "1" = highlights line 1
* "2,5" = highlights lines 2 & 5
* "2,5-7" = highlights lines 2, 5, 6 & 7
*/
highlightLines: function( block, linesToHighlight ) {
linesToHighlight = linesToHighlight || block.getAttribute( 'data-highlight-lines' );
if( typeof linesToHighlight === 'string' ) {
block.classList.add( 'highlight-lines' );
linesToHighlight.split( ',' ).forEach( function( lineNumbers ) {
lineNumbers = lineNumbers.split( '-' )
var lineStart = lineNumbers[0];
var lineEnd = lineNumbers[1] || lineStart;
[].slice.call( block.querySelectorAll( 'table tr:nth-child(n+'+lineStart+'):nth-child(-n+'+lineEnd+')' ) ).forEach( function( lineElement ) {
lineElement.classList.add( 'highlight-line' );
} );
} );
}
else {
block.classList.remove( 'highlight-lines' );
}
}
}
})();
Reveal.registerPlugin( 'highlight', RevealHighlight );
// END CUSTOM REVEAL.JS INTEGRATION