rrubocop 0.7.5

10x faster RuboCop drop-in. Same output format and configs, without maintaining RuboCop gems.
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

//! Style/StringLiteralsInInterpolation.

use tree_sitter::Node;

use crate::cop::shared::node_bytes;
use crate::cop::{Cop, CopConfig};
use crate::diagnostic::Diagnostic;
use crate::parse::source::SourceFile;

pub struct StringLiteralsInInterpolation;

impl Cop for StringLiteralsInInterpolation {
    fn name(&self) -> &'static str {
        "Style/StringLiteralsInInterpolation"
    }

    fn interested_node_kinds(&self) -> &'static [&'static str] {
        &["interpolation"]
    }

    fn check_node(
        &self,
        source: &SourceFile,
        node: Node<'_>,
        config: &CopConfig,
        diagnostics: &mut Vec<Diagnostic>,
        _corrections: Option<&mut Vec<crate::correction::Correction>>,
    ) {
        let style = config.get_str("EnforcedStyle", "single_quotes");
        let mut cur = node.walk();
        for child in node.named_children(&mut cur) {
            report_string(self, source, child, style, diagnostics);
        }
    }
}

fn report_string(
    cop: &StringLiteralsInInterpolation,
    source: &SourceFile,
    child: Node<'_>,
    style: &str,
    diagnostics: &mut Vec<Diagnostic>,
) {
    if child.kind() != "string" {
        return;
    }
    let b = node_bytes(source, child);
    let dq = b.starts_with(b"\"");
    let sq = b.starts_with(b"'");
    let bad = (style == "single_quotes" && dq) || (style == "double_quotes" && sq);
    if !bad {
        return;
    }
    let (line, col) = source.offset_to_line_col(child.start_byte());
    diagnostics.push(cop.diagnostic(
        source,
        line,
        col,
        format!("Prefer {style} for strings inside interpolations."),
    ));
}