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/* eslint-disable func-names, no-underscore-dangle, no-param-reassign, consistent-return */
import $ from 'jquery';
// LineHighlighter
//
// Handles single- and multi-line selection and highlight for blob views.
//
//
// ### Example Markup
//
// <div id="blob-content-holder">
// <div class="file-content">
// <div class="line-numbers">
// <a href="#L1" id="L1" data-line-number="1">1</a>
// <a href="#L2" id="L2" data-line-number="2">2</a>
// <a href="#L3" id="L3" data-line-number="3">3</a>
// <a href="#L4" id="L4" data-line-number="4">4</a>
// <a href="#L5" id="L5" data-line-number="5">5</a>
// </div>
// <pre class="code highlight">
// <code>
// <span id="LC1" class="line">...</span>
// <span id="LC2" class="line">...</span>
// <span id="LC3" class="line">...</span>
// <span id="LC4" class="line">...</span>
// <span id="LC5" class="line">...</span>
// </code>
// </pre>
// </div>
// </div>
//
const LineHighlighter = function(options = {}) {
options.highlightLineClass = options.highlightLineClass || 'hll';
options.fileHolderSelector = options.fileHolderSelector || '.file-holder';
options.scrollFileHolder = options.scrollFileHolder || false;
options.hash = options.hash || window.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);
$fileHolder.on('highlight:line', this.highlightHash);
window.addEventListener('hashchange', e => this.highlightHash(e.target.location.hash));
};
LineHighlighter.prototype.highlightHash = function(newHash) {
let range;
if (newHash && typeof newHash === 'string') this._hash = newHash;
this.clearHighlight();
if (this._hash !== '') {
range = this.hashToRange(this._hash);
if (range[0]) {
this.highlightRange(range);
const lineSelector = `#L${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) {
let range;
event.preventDefault();
this.clearHighlight();
const lineNumber = $(event.target)
.closest('a')
.data('lineNumber');
const 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) {
// ?L(\d+)(?:-(\d+))?$/)
const matches = hash.match(/^#?L(\d+)(?:-(\d+))?$/);
if (matches && matches.length) {
const first = parseInt(matches[1], 10);
const last = matches[2] ? parseInt(matches[2], 10) : null;
return [first, last];
}
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) {
if (range[1]) {
const results = [];
const ref = range[0] <= range[1] ? range : range.reverse();
for (let lineNumber = range[0]; lineNumber <= ref[1]; lineNumber += 1) {
results.push(this.highlightLine(lineNumber));
}
return results;
}
return this.highlightLine(range[0]);
};
// Set the URL hash string
LineHighlighter.prototype.setHash = function(firstLineNumber, lastLineNumber) {
let 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 window.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,
);
};
export default LineHighlighter;
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