+//! Rustdoc specific doc comment handling
+
+// stripped down version of https://github.com/rust-lang/rust/blob/392ba2ba1a7d6c542d2459fb8133bebf62a4a423/src/librustdoc/html/markdown.rs#L810-L933
+pub fn is_rust_fence(s: &str) -> bool {
+ let mut seen_rust_tags = false;
+ let mut seen_other_tags = false;
+
+ let tokens = s
+ .trim()
+ .split(|c| c == ',' || c == ' ' || c == '\t')
+ .map(str::trim)
+ .filter(|t| !t.is_empty());
+
+ for token in tokens {
+ match token {
+ "should_panic" | "no_run" | "ignore" | "allow_fail" => {
+ seen_rust_tags = !seen_other_tags
+ }
+ "rust" => seen_rust_tags = true,
+ "test_harness" | "compile_fail" => seen_rust_tags = !seen_other_tags || seen_rust_tags,
+ x if x.starts_with("edition") => {}
+ x if x.starts_with('E') && x.len() == 5 => {
+ if x[1..].parse::<u32>().is_ok() {
+ seen_rust_tags = !seen_other_tags || seen_rust_tags;
+ } else {
+ seen_other_tags = true;
+ }
+ }
+ _ => seen_other_tags = true,
+ }
+ }
+
+ !seen_other_tags || seen_rust_tags
+}