CommentStripper/script.js at main · BaseMax/CommentStripper · GitHub

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
const elements = {
    inputCode: document.querySelector('#inputCode'),
    outputCode: document.querySelector('#outputCode'),
    lineComment: document.querySelector('#lineComment'),
    escapeSymbol: document.querySelector('#escapeSymbol'),
    blockStart: document.querySelector('#blockStart'),
    blockEnd: document.querySelector('#blockEnd'),
    trimWhitespace: document.querySelector('#trimWhitespace'),
    presetsContainer: document.querySelector('.presets')
};

const presets = {
    'C/C++/C#': { line: '//', escape: '\\', blockStart: '/*', blockEnd: '*/' },
    'PHP': { line: '//', escape: '\\', blockStart: '/*', blockEnd: '*/' },
    'Java': { line: '//', escape: '\\', blockStart: '/*', blockEnd: '*/' },
    'JavaScript': { line: '//', escape: '\\', blockStart: '/*', blockEnd: '*/' },
    'Python': { line: '#', escape: '\\', blockStart: '"""', blockEnd: '"""' },
    'HTML': { line: '', escape: '', blockStart: '<!--', blockEnd: '-->' },
    'CSS': { line: '', escape: '', blockStart: '/*', blockEnd: '*/' },
    'SQL': { line: '--', escape: '', blockStart: '/*', blockEnd: '*/' },
    'MATLAB': { line: '%', escape: '', blockStart: '/*', blockEnd: '*/' },
    'Ruby': { line: '#', escape: '\\', blockStart: '=begin', blockEnd: '=end' },
    'Swift': { line: '//', escape: '\\', blockStart: '/*', blockEnd: '*/' },
    'Assembly': { line: ';', escape: '', blockStart: '', blockEnd: '' }
};

function setPreset(lang) {
    const preset = presets[lang];
    elements.lineComment.value = preset.line;
    elements.escapeSymbol.value = preset.escape;
    elements.blockStart.value = preset.blockStart;
    elements.blockEnd.value = preset.blockEnd;
}

function generatePresetButtons() {
    for (const lang in presets) {
        const button = document.createElement('button');
        button.classList.add('preset-btn');
        button.textContent = lang;
        button.onclick = () => setPreset(lang);
        elements.presetsContainer.appendChild(button);
    }
}

function removeComments() {
    const input = elements.inputCode.value;
    const lineComment = elements.lineComment.value;
    const escapeSymbol = elements.escapeSymbol.value;
    const blockStart = elements.blockStart.value;
    const blockEnd = elements.blockEnd.value;
    const trimWhitespace = elements.trimWhitespace.checked;

    let output = '';
    let i = 0;
    let inString = false;
    let stringChar = '';

    while (i < input.length) {
        if (isInBlockComment(input, i, blockStart, blockEnd)) {
            i = handleBlockComment(input, i, blockStart, blockEnd);
            continue;
        }

        if (isInLineComment(input, i, lineComment)) {
            i = handleLineComment(input, i);
            continue;
        }

        if (isInString(input, i, stringChar, escapeSymbol, inString)) {
            i = handleString(input, i, escapeSymbol, stringChar, inString);
            continue;
        }

        output += input[i];
        i++;
    }

    if (trimWhitespace) {
        output = output.replace(/[ \t]+$/gm, '');
    }

    elements.outputCode.value = output.trim();
}

function isInBlockComment(input, i, blockStart, blockEnd) {
    return !inBlockComment && blockStart && input.startsWith(blockStart, i);
}

function handleBlockComment(input, i, blockStart, blockEnd) {
    if (!inBlockComment && blockStart && input.startsWith(blockStart, i)) {
        inBlockComment = true;
        i += blockStart.length;
    }
    if (inBlockComment && blockEnd && input.startsWith(blockEnd, i)) {
        inBlockComment = false;
        i += blockEnd.length;
    }
    return i;
}

function isInLineComment(input, i, lineComment) {
    return !inLineComment && lineComment && input.startsWith(lineComment, i);
}

function handleLineComment(input, i) {
    if (inLineComment && input[i] === '\n') {
        inLineComment = false;
        output += '\n';
        i++;
    }
    return i;
}

function isInString(input, i, stringChar, escapeSymbol, inString) {
    return !inString && (input[i] === '"' || input[i] === "'" || input[i] === "`");
}

function handleString(input, i, escapeSymbol, stringChar, inString) {
    if (inString) {
        output += input[i];
        if (input[i] === stringChar && (i === 0 || input[i - 1] !== escapeSymbol)) {
            inString = false;
            stringChar = '';
        }
    }
    return i + 1;
}

elements.inputCode.addEventListener('input', removeComments);

generatePresetButtons();