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// LineHighlighter
//
// Handles single- and multi-line selection and highlight for blob views.
//
/*= require jquery.scrollTo */
//
// ### 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>
//
(function() {
var bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
this.LineHighlighter = (function() {
// CSS class applied to highlighted lines
LineHighlighter.prototype.highlightClass = 'hll';
// Internal copy of location.hash so we're not dependent on `location` in tests
LineHighlighter.prototype._hash = '';
function LineHighlighter(hash) {
var range;
if (hash == null) {
// Initialize a LineHighlighter object
//
// hash - String URL hash for dependency injection in tests
hash = location.hash;
}
this.setHash = bind(this.setHash, this);
this.highlightLine = bind(this.highlightLine, this);
this.clickHandler = bind(this.clickHandler, this);
this._hash = hash;
this.bindEvents();
if (hash !== '') {
range = this.hashToRange(hash);
if (range[0]) {
this.highlightRange(range);
$.scrollTo("#L" + range[0], {
// Scroll to the first highlighted line on initial load
// Offset -50 for the sticky top bar, and another -100 for some context
offset: -150
});
}
}
}
LineHighlighter.prototype.bindEvents = function() {
$('#blob-content-holder').on('mousedown', 'a[data-line-number]', this.clickHandler);
// While it may seem odd to bind to the mousedown event and then throw away
// the click event, there is a method to our madness.
//
// If not done this way, the line number anchor will sometimes keep its
// active state even when the event is cancelled, resulting in an ugly border
// around the link and/or a persisted underline text decoration.
return $('#blob-content-holder').on('click', 'a[data-line-number]', function(event) {
return event.preventDefault();
});
};
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 $("." + this.highlightClass).removeClass(this.highlightClass);
// Unhighlight previously highlighted lines
};
// Convert a URL hash String into line numbers
//
// hash - Hash String
//
// Examples:
//
// hashToRange('#L5') # => [5, null]
// hashToRange('#L5-15') # => [5, 15]
// hashToRange('#foo') # => [null, null]
//
// Returns an Array
LineHighlighter.prototype.hashToRange = function(hash) {
var first, last, matches;
//?L(\d+)(?:-(\d+))?$/)
matches = hash.match(/^#?L(\d+)(?:-(\d+))?$/);
if (matches && matches.length) {
first = parseInt(matches[1]);
last = matches[2] ? parseInt(matches[2]) : 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.highlightClass);
};
// 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 : --i) {
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({
turbolinks: false,
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);
};
return LineHighlighter;
})();
}).call(this);
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