rrubocop 0.8.15

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

use tree_sitter::Tree;

use crate::cop::layout::report;
use crate::cop::{Cop, CopConfig};
use crate::correction::Correction;
use crate::diagnostic::Diagnostic;
use crate::parse::codemap::CodeMap;
use crate::parse::source::SourceFile;

pub struct IndentationStyle;

fn indent_bad(style: &str, indent: &[u8]) -> bool {
    let has_tab = indent.contains(&b'\t');
    let has_space = indent.contains(&b' ');
    if style == "tabs" { has_space } else { has_tab }
}

fn tabs_replacement(indent: &[u8], width: usize) -> String {
    let spaces = indent.iter().filter(|&&b| b == b' ').count() / width.max(1);
    "\t".repeat(spaces + indent.iter().filter(|&&b| b == b'\t').count())
}

fn spaces_replacement(indent: &[u8], width: usize) -> String {
    " ".repeat(
        indent.iter().filter(|&&b| b == b'\t').count() * width
            + indent.iter().filter(|&&b| b == b' ').count(),
    )
}

fn replacement_for(style: &str, indent: &[u8], width: usize) -> String {
    if style == "tabs" {
        tabs_replacement(indent, width)
    } else {
        spaces_replacement(indent, width)
    }
}

fn check_line(
    cop: &dyn Cop, source: &SourceFile, code_map: &CodeMap, style: &str, width: usize,
    offset: usize, line: &[u8],
    diagnostics: &mut Vec<Diagnostic>, corrections: &mut Option<&mut Vec<Correction>>,
) {
    let indent_end = line.iter().position(|&b| b != b' ' && b != b'\t').unwrap_or(line.len());
    let indent = &line[..indent_end];
    if indent.is_empty() || !indent_bad(style, indent) || code_map.covers(offset) { return; }
    let ty = if style == "tabs" { "Space" } else { "Tab" };
    report::report_fix(
        cop, source, offset, format!("{ty} detected in indentation."),
        diagnostics, corrections, offset, offset + indent_end, replacement_for(style, indent, width),
    );
}

impl Cop for IndentationStyle {
    fn name(&self) -> &'static str { "Layout/IndentationStyle" }
    fn supports_autocorrect(&self) -> bool { true }

    fn uses_source_phase(&self) -> bool {
        true
    }

    fn check_source(
        &self, source: &SourceFile, _tree: &Tree, code_map: &CodeMap,
        config: &CopConfig, diagnostics: &mut Vec<Diagnostic>,
        mut corrections: Option<&mut Vec<Correction>>,
    ) {
        let style = config.get_str("EnforcedStyle", "spaces");
        let width = config.get_usize("IndentationWidth", 2);
        let mut offset = 0usize;
        for line in source.lines() {
            check_line(self, source, code_map, style, width, offset, line, diagnostics, &mut corrections);
            offset += line.len() + 1;
        }
    }
}