2 use rustc_hir::intravisit::FnKind;
3 use rustc_lint::{LateContext, LintContext};
4 use rustc_middle::lint::in_external_macro;
7 use clippy_utils::diagnostics::span_lint;
8 use clippy_utils::source::snippet_opt;
10 use super::TOO_MANY_LINES;
12 pub(super) fn check_fn(
17 too_many_lines_threshold: u64,
19 // Closures must be contained in a parent body, which will be checked for `too_many_lines`.
20 // Don't check closures for `too_many_lines` to avoid duplicated lints.
21 if matches!(kind, FnKind::Closure) || in_external_macro(cx.sess(), span) {
25 let Some(code_snippet) = snippet_opt(cx, body.value.span) else {
28 let mut line_count: u64 = 0;
29 let mut in_comment = false;
32 let function_lines = if matches!(body.value.kind, hir::ExprKind::Block(..))
33 && code_snippet.as_bytes().first().copied() == Some(b'{')
34 && code_snippet.as_bytes().last().copied() == Some(b'}')
36 // Removing the braces from the enclosing block
37 &code_snippet[1..code_snippet.len() - 1]
41 .trim() // Remove leading and trailing blank lines
44 for mut line in function_lines {
47 line = line.trim_start();
52 if let Some(i) = line.find("*/") {
53 line = &line[i + 2..];
58 let multi_idx = line.find("/*").unwrap_or(line.len());
59 let single_idx = line.find("//").unwrap_or(line.len());
60 code_in_line |= multi_idx > 0 && single_idx > 0;
61 // Implies multi_idx is below line.len()
62 if multi_idx < single_idx {
63 line = &line[multi_idx + 2..];
75 if line_count > too_many_lines_threshold {
80 &format!("this function has too many lines ({line_count}/{too_many_lines_threshold})"),