1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/* eslint-disable func-names, no-underscore-dangle, no-param-reassign, consistent-return */
import $ from 'jquery';
import 'vendor/jquery.scrollTo';
// 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;
|
