omena-scss-eval 0.3.0

Oracle-first SCSS and Less value evaluator rail for Omena CSS
Documentation 
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

use omena_parser::LexedToken;
use omena_syntax::SyntaxKind;

pub(super) fn tokens_between_are_trivia(tokens: &[LexedToken], start: usize, end: usize) -> bool {
    start <= end
        && end <= tokens.len()
        && tokens[start..end]
            .iter()
            .all(|token| is_trivia_token(token.kind))
}

pub(super) fn token_range_start(token: &LexedToken) -> usize {
    token.range.start().into()
}

pub(super) fn token_range_end(token: &LexedToken) -> usize {
    token.range.end().into()
}

pub(super) fn matching_right_paren_token_index(
    tokens: &[LexedToken],
    left_paren_index: usize,
) -> Option<usize> {
    let mut depth = 0usize;
    for (index, token) in tokens.iter().enumerate().skip(left_paren_index) {
        match token.kind {
            SyntaxKind::LeftParen => depth += 1,
            SyntaxKind::RightParen => {
                depth = depth.checked_sub(1)?;
                if depth == 0 {
                    return Some(index);
                }
            }
            _ => {}
        }
    }
    None
}

pub(super) fn matching_right_brace_token_index(
    tokens: &[LexedToken],
    left_brace_index: usize,
) -> Option<usize> {
    let mut depth = 0usize;
    for (index, token) in tokens.iter().enumerate().skip(left_brace_index) {
        match token.kind {
            SyntaxKind::LeftBrace => depth += 1,
            SyntaxKind::RightBrace => {
                depth = depth.checked_sub(1)?;
                if depth == 0 {
                    return Some(index);
                }
            }
            _ => {}
        }
    }
    None
}

pub(super) fn matching_block_end_token_index(
    tokens: &[LexedToken],
    block_start_index: usize,
) -> Option<usize> {
    match tokens.get(block_start_index)?.kind {
        SyntaxKind::LeftBrace => matching_right_brace_token_index(tokens, block_start_index),
        SyntaxKind::SassIndent => matching_sass_dedent_token_index(tokens, block_start_index),
        _ => None,
    }
}

pub(super) fn next_block_start_token_index(
    tokens: &[LexedToken],
    mut index: usize,
) -> Option<usize> {
    while index < tokens.len() {
        match tokens[index].kind {
            SyntaxKind::LeftBrace | SyntaxKind::SassIndent => return Some(index),
            SyntaxKind::Semicolon | SyntaxKind::SassOptionalSemicolon => return None,
            _ => index += 1,
        }
    }
    None
}

fn matching_sass_dedent_token_index(
    tokens: &[LexedToken],
    sass_indent_index: usize,
) -> Option<usize> {
    let mut depth = 0usize;
    for (index, token) in tokens.iter().enumerate().skip(sass_indent_index) {
        match token.kind {
            SyntaxKind::SassIndent => depth += 1,
            SyntaxKind::SassDedent => {
                depth = depth.checked_sub(1)?;
                if depth == 0 {
                    return Some(index);
                }
            }
            _ => {}
        }
    }
    None
}

pub(super) fn next_non_trivia_token_index(
    tokens: &[LexedToken],
    mut index: usize,
) -> Option<usize> {
    while tokens
        .get(index)
        .is_some_and(|token| is_trivia_token(token.kind))
    {
        index += 1;
    }
    (index < tokens.len()).then_some(index)
}

pub(super) fn declaration_end_token_index(
    tokens: &[LexedToken],
    mut index: usize,
) -> Option<usize> {
    let mut paren_depth = 0usize;
    while index < tokens.len() {
        match tokens[index].kind {
            SyntaxKind::LeftParen => paren_depth += 1,
            SyntaxKind::RightParen => paren_depth = paren_depth.checked_sub(1)?,
            SyntaxKind::Semicolon | SyntaxKind::SassOptionalSemicolon | SyntaxKind::SassIndent
                if paren_depth == 0 =>
            {
                return Some(index);
            }
            _ => {}
        }
        index += 1;
    }
    None
}

const fn is_trivia_token(kind: SyntaxKind) -> bool {
    matches!(
        kind,
        SyntaxKind::Whitespace
            | SyntaxKind::LineComment
            | SyntaxKind::BlockComment
            | SyntaxKind::ScssSilentComment
            | SyntaxKind::SassIndentedNewline
    )
}