summaryrefslogtreecommitdiff
path: root/ext/js/dom/text-source-element.js
blob: 11bf7eb0b3ca5d09c0ea4963b3841b7e363e0cea (plain)
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
/*
 * Copyright (C) 2016-2021  Yomichan Authors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

class TextSourceElement {
    constructor(element, fullContent=null, startOffset=0, endOffset=0) {
        this._element = element;
        this._fullContent = (typeof fullContent === 'string' ? fullContent : TextSourceElement.getElementContent(element));
        this._startOffset = startOffset;
        this._endOffset = endOffset;
        this._content = this._fullContent.substring(this._startOffset, this._endOffset);
    }

    get type() {
        return 'element';
    }

    get element() {
        return this._element;
    }

    get fullContent() {
        return this._fullContent;
    }

    get startOffset() {
        return this._startOffset;
    }

    get endOffset() {
        return this._endOffset;
    }

    get isConnected() {
        return this._element.isConnected;
    }

    clone() {
        return new TextSourceElement(this._element, this._fullContent, this._startOffset, this._endOffset);
    }

    cleanup() {
        // NOP
    }

    text() {
        return this._content;
    }

    setEndOffset(length, fromEnd=false) {
        if (fromEnd) {
            const delta = Math.min(this._fullContent.length - this._endOffset, length);
            this._endOffset += delta;
            this._content = this._fullContent.substring(this._startOffset, this._endOffset);
            return delta;
        } else {
            const delta = Math.min(this._fullContent.length - this._startOffset, length);
            this._endOffset = this._startOffset + delta;
            this._content = this._fullContent.substring(this._startOffset, this._endOffset);
            return delta;
        }
    }

    setStartOffset(length) {
        const delta = Math.min(this._startOffset, length);
        this._startOffset -= delta;
        this._content = this._fullContent.substring(this._startOffset, this._endOffset);
        return delta;
    }

    collapse(toStart) {
        if (toStart) {
            this._endOffset = this._startOffset;
        } else {
            this._startOffset = this._endOffset;
        }
        this._content = '';
    }

    getRect() {
        return this._element.getBoundingClientRect();
    }

    getWritingMode() {
        return 'horizontal-tb';
    }

    select() {
        // NOP
    }

    deselect() {
        // NOP
    }

    hasSameStart(other) {
        return (
            typeof other === 'object' &&
            other !== null &&
            other instanceof TextSourceElement &&
            this._element === other.element &&
            this._fullContent === other.fullContent &&
            this._startOffset === other.startOffset
        );
    }

    getNodesInRange() {
        return [this._element];
    }

    static getElementContent(element) {
        let content;
        switch (element.nodeName.toUpperCase()) {
            case 'BUTTON':
                content = element.textContent;
                break;
            case 'IMG':
                content = element.getAttribute('alt') || '';
                break;
            case 'SELECT':
                {
                    const {selectedIndex, options} = element;
                    const option = (selectedIndex >= 0 && selectedIndex < options.length ? options[selectedIndex] : null);
                    content = (option !== null ? option.textContent : '');
                }
                break;
            default:
                content = `${element.value}`;
                break;
        }

        // Remove zero-width space and zero-width non-joiner
        content = content.replace(/[\u200b\u200c]/g, '');

        return content;
    }
}