/* eslint-disable func-names, space-before-function-paren, no-var, prefer-rest-params, wrap-iife, no-use-before-define, no-underscore-dangle, no-param-reassign, prefer-template, quotes, comma-dangle, prefer-arrow-callback, consistent-return, one-var, one-var-declaration-per-line, no-else-return, max-len */ // LineHighlighter // // Handles single- and multi-line selection and highlight for blob views. // // // ### Example Markup // //
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// const LineHighlighter = function(options = {}) { options.highlightLineClass = options.highlightLineClass || 'hll'; options.fileHolderSelector = options.fileHolderSelector || '.file-holder'; options.scrollFileHolder = options.scrollFileHolder || false; options.hash = options.hash || location.hash; this.options = options; this._hash = options.hash; this.highlightLineClass = options.highlightLineClass; this.setHash = this.setHash.bind(this); this.highlightLine = this.highlightLine.bind(this); this.clickHandler = this.clickHandler.bind(this); this.highlightHash = this.highlightHash.bind(this); this.bindEvents(); this.highlightHash(); }; LineHighlighter.prototype.bindEvents = function() { const $fileHolder = $(this.options.fileHolderSelector); $fileHolder.on('click', 'a[data-line-number]', this.clickHandler); $fileHolder.on('highlight:line', this.highlightHash); }; LineHighlighter.prototype.highlightHash = function(newHash) { let range; if (newHash) this._hash = newHash; this.clearHighlight(); if (this._hash !== '') { range = this.hashToRange(this._hash); if (range[0]) { this.highlightRange(range); const lineSelector = `#L${range[0]}`; const scrollOptions = { // Scroll to the first highlighted line on initial load // Offset -50 for the sticky top bar, and another -100 for some context offset: -150 }; if (this.options.scrollFileHolder) { $(this.options.fileHolderSelector).scrollTo(lineSelector, scrollOptions); } else { $.scrollTo(lineSelector, scrollOptions); } } } }; LineHighlighter.prototype.clickHandler = function(event) { var current, lineNumber, range; event.preventDefault(); this.clearHighlight(); lineNumber = $(event.target).closest('a').data('line-number'); current = this.hashToRange(this._hash); if (!(current[0] && event.shiftKey)) { // If there's no current selection, or there is but Shift wasn't held, // treat this like a single-line selection. this.setHash(lineNumber); return this.highlightLine(lineNumber); } else if (event.shiftKey) { if (lineNumber < current[0]) { range = [lineNumber, current[0]]; } else { range = [current[0], lineNumber]; } this.setHash(range[0], range[1]); return this.highlightRange(range); } }; LineHighlighter.prototype.clearHighlight = function() { return $("." + this.highlightLineClass).removeClass(this.highlightLineClass); }; // Convert a URL hash String into line numbers // // hash - Hash String // // Examples: // // hashToRange('#L5') # => [5, null] // hashToRange('#L5-15') # => [5, 15] // hashToRange('#foo') # => [null, null] // // Returns an Array LineHighlighter.prototype.hashToRange = function(hash) { var first, last, matches; // ?L(\d+)(?:-(\d+))?$/) matches = hash.match(/^#?L(\d+)(?:-(\d+))?$/); if (matches && matches.length) { first = parseInt(matches[1], 10); last = matches[2] ? parseInt(matches[2], 10) : null; return [first, last]; } else { return [null, null]; } }; // Highlight a single line // // lineNumber - Line number to highlight LineHighlighter.prototype.highlightLine = function(lineNumber) { return $("#LC" + lineNumber).addClass(this.highlightLineClass); }; // Highlight all lines within a range // // range - Array containing the starting and ending line numbers LineHighlighter.prototype.highlightRange = function(range) { var i, lineNumber, ref, ref1, results; if (range[1]) { results = []; for (lineNumber = i = ref = range[0], ref1 = range[1]; ref <= ref1 ? i <= ref1 : i >= ref1; lineNumber = ref <= ref1 ? (i += 1) : (i -= 1)) { results.push(this.highlightLine(lineNumber)); } return results; } else { return this.highlightLine(range[0]); } }; // Set the URL hash string LineHighlighter.prototype.setHash = function(firstLineNumber, lastLineNumber) { var hash; if (lastLineNumber) { hash = "#L" + firstLineNumber + "-" + lastLineNumber; } else { hash = "#L" + firstLineNumber; } this._hash = hash; return this.__setLocationHash__(hash); }; // Make the actual hash change in the browser // // This method is stubbed in tests. LineHighlighter.prototype.__setLocationHash__ = function(value) { return history.pushState({ url: value // We're using pushState instead of assigning location.hash directly to // prevent the page from scrolling on the hashchange event }, document.title, value); }; window.LineHighlighter = LineHighlighter;