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pub(super) fn extract_doc_comment(source: &str, function_start_row: usize) -> Option<String> {
let lines = source.lines().collect::<Vec<_>>();
if function_start_row == 0 || function_start_row > lines.len() {
return None;
}
let mut index = function_start_row;
let mut comment_lines = Vec::new();
while index > 0 {
index -= 1;
let trimmed = lines[index].trim();
if trimmed.is_empty() {
break;
}
if trimmed.starts_with("//") {
comment_lines.push(trimmed.trim_start_matches("//").trim().to_string());
continue;
}
if trimmed.ends_with("*/") {
let mut block_lines = vec![trimmed.to_string()];
while index > 0 {
index -= 1;
block_lines.push(lines[index].trim().to_string());
if lines[index].trim().starts_with("/*") {
break;
}
}
block_lines.reverse();
let normalized = block_lines
.into_iter()
.map(|line| {
line.trim_start_matches("/*")
.trim_end_matches("*/")
.trim_start_matches('*')
.trim()
.to_string()
})
.filter(|line| !line.is_empty())
.collect::<Vec<_>>();
if normalized.is_empty() {
return None;
}
return Some(normalized.join("\n"));
}
break;
}
if comment_lines.is_empty() {
None
} else {
comment_lines.reverse();
Some(comment_lines.join("\n"))
}
}