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use super::{add_contains_edge, add_node_if_missing, make_file_node};
use crate::error::Result;
use crate::extract::{make_id, ImportNode, LanguageExtractor};
use crate::types::{Edge, ExtractionFragment, Node};
use std::collections::HashMap;
use std::path::Path;
pub struct TsKotlinExtractor;
fn kt_node(id: String, label: String, file_type: &str, path: &Path) -> Node {
Node {
id,
label,
file_type: file_type.to_string(),
source_file: path.to_string_lossy().to_string(),
source_location: None,
community: None,
rationale: None,
docstring: None,
metadata: HashMap::new(),
}
}
/// Parse Kotlin delegation specifiers string (after the `:`) into (name, is_class) pairs.
/// "BaseProcessor(), Loggable" → [("BaseProcessor", true), ("Loggable", false)]
fn parse_delegation_specs(specs_str: &str) -> Vec<(String, bool)> {
let mut result = Vec::new();
let mut depth = 0i32;
let mut angle = 0i32;
let mut current = String::new();
for ch in specs_str.chars() {
match ch {
'<' => {
angle += 1;
current.push(ch);
}
'>' => {
angle -= 1;
if angle < 0 {
angle = 0;
}
current.push(ch);
}
'(' if angle == 0 => {
depth += 1;
current.push(ch);
}
')' if angle == 0 => {
depth -= 1;
if depth < 0 {
depth = 0;
}
current.push(ch);
}
',' if depth == 0 && angle == 0 => {
let spec = current.trim().to_string();
if !spec.is_empty() {
let is_class = spec.contains('(');
let name = spec
.split('<')
.next()
.unwrap_or(&spec)
.split('(')
.next()
.unwrap_or(&spec)
.trim()
.to_string();
if !name.is_empty() {
result.push((name, is_class));
}
}
current = String::new();
}
_ => {
current.push(ch);
}
}
}
if !current.trim().is_empty() {
let spec = current.trim().to_string();
let is_class = spec.contains('(');
let name = spec
.split('<')
.next()
.unwrap_or(&spec)
.split('(')
.next()
.unwrap_or(&spec)
.trim()
.to_string();
if !name.is_empty() {
result.push((name, is_class));
}
}
result
}
/// Extract a Kotlin type from a type annotation string like "Result<DataProcessor>".
/// Returns (bare_type, vec_of_generic_args)
fn parse_kotlin_type(type_str: &str) -> (String, Vec<String>) {
let trimmed = type_str.trim().trim_end_matches('?');
if let Some(lt) = trimmed.find('<') {
let base = trimmed[..lt].trim().to_string();
let args_str = trimmed[lt + 1..].trim_end_matches('>');
let args: Vec<String> = args_str
.split(',')
.map(|s| s.trim().trim_end_matches('?').to_string())
.filter(|s| !s.is_empty())
.collect();
(base, args)
} else {
(trimmed.to_string(), vec![])
}
}
impl TsKotlinExtractor {
pub fn extract(source: &[u8], path: &Path) -> Result<ExtractionFragment> {
let (file_id, _, file_node) = make_file_node(path);
let mut fragment = ExtractionFragment {
nodes: vec![file_node],
edges: vec![],
};
let content = std::str::from_utf8(source).unwrap_or("");
let stem = file_id.clone();
let mut current_class: Option<String> = None;
for line in content.lines() {
let trimmed = line.trim();
// import header
if let Some(rest) = trimmed.strip_prefix("import ") {
let full = rest.split_whitespace().next().unwrap_or("").trim();
let leaf = full.split('.').next_back().unwrap_or(full).to_string();
if !leaf.is_empty() {
let id = make_id(&[&leaf]);
add_node_if_missing(&mut fragment, kt_node(id.clone(), leaf, "module", path));
fragment.edges.push(Edge {
source: file_id.clone(),
target: id,
relation: "imports".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: Some("import".to_string()),
});
}
continue;
}
// class / interface / object / data class declaration
let is_class_line = {
let mut kw = None;
for prefix in &[
"class ",
"data class ",
"open class ",
"abstract class ",
"sealed class ",
"interface ",
"object ",
"enum class ",
] {
if let Some(rest) = trimmed.strip_prefix(prefix) {
kw = Some((*prefix, rest));
break;
}
}
kw
};
if let Some((kw, rest)) = is_class_line {
// Extract name (up to ':', '(', '<', '{', ' ')
let class_name = rest
.split([':', '(', '<', '{'])
.next()
.unwrap_or("")
.trim()
.to_string();
let class_file_type = match kw {
"interface " => "interface",
"enum class " => "enum",
_ => "class",
};
if !class_name.is_empty() {
let class_id = make_id(&[&stem, &class_name]);
add_node_if_missing(
&mut fragment,
kt_node(class_id.clone(), class_name.clone(), class_file_type, path),
);
add_contains_edge(&mut fragment, &file_id, class_id.clone(), path);
current_class = Some(class_id.clone());
// Parse delegation specifiers (after ':')
if let Some(colon_pos) = trimmed.find(':') {
let after_colon = &trimmed[colon_pos + 1..];
// Strip trailing '{', '{'
let specs_str = after_colon.split('{').next().unwrap_or(after_colon).trim();
for (base_name, is_class_base) in parse_delegation_specs(specs_str) {
let base_id = make_id(&[&stem, &base_name]);
add_node_if_missing(
&mut fragment,
kt_node(base_id.clone(), base_name, "code", path),
);
let relation = if is_class_base {
"inherits"
} else {
"implements"
};
fragment.edges.push(Edge {
source: class_id.clone(),
target: base_id,
relation: relation.to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: None,
});
}
}
}
continue;
}
// fun declaration inside or outside class
if let Some(rest) = trimmed.strip_prefix("fun ").or_else(|| {
// modifiers before fun
let stripped = trimmed
.trim_start_matches("override ")
.trim_start_matches("private ")
.trim_start_matches("public ")
.trim_start_matches("protected ")
.trim_start_matches("internal ")
.trim_start_matches("suspend ")
.trim_start_matches("inline ")
.trim_start_matches("abstract ");
if stripped.starts_with("fun ") {
stripped.strip_prefix("fun ")
} else {
None
}
}) {
// Extract function name and type info
let func_name = rest
.split(['(', '<', ':', ' '])
.next()
.unwrap_or("")
.trim()
.to_string();
if func_name.is_empty() {
continue;
}
let func_id = make_id(&[&stem, &func_name, "()"]);
let label = format!(".{}()", func_name);
let fn_file_type = if current_class.is_some() {
"method"
} else {
"function"
};
add_node_if_missing(
&mut fragment,
kt_node(func_id.clone(), label, fn_file_type, path),
);
let owner = current_class.as_deref().unwrap_or(&file_id);
fragment.edges.push(Edge {
source: owner.to_string(),
target: func_id.clone(),
relation: "method".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: None,
});
fragment.edges.push(Edge {
source: file_id.clone(),
target: func_id.clone(),
relation: "contains".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: None,
});
// Extract return type (after last `)`): `): Type`
if let Some(paren_end) = rest.rfind(')') {
let after_paren = rest[paren_end + 1..].trim();
if let Some(ret_str) = after_paren.strip_prefix(':') {
let ret_type_str = ret_str
.split('{')
.next()
.unwrap_or(ret_str)
.split('=')
.next()
.unwrap_or(ret_str)
.trim();
let (base_type, generic_args) = parse_kotlin_type(ret_type_str);
if !base_type.is_empty() && base_type != "Unit" {
let id = make_id(&[&base_type]);
add_node_if_missing(
&mut fragment,
kt_node(id.clone(), base_type, "code", path),
);
fragment.edges.push(Edge {
source: func_id.clone(),
target: id,
relation: "references".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: Some("return_type".to_string()),
});
}
for arg in generic_args {
if !arg.is_empty() {
let id = make_id(&[&arg]);
add_node_if_missing(
&mut fragment,
kt_node(id.clone(), arg, "code", path),
);
fragment.edges.push(Edge {
source: func_id.clone(),
target: id,
relation: "references".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: Some("generic_arg".to_string()),
});
}
}
}
}
// Extract parameter types from `(param: Type, ...)`
if let Some(paren_start) = rest.find('(') {
let paren_end = rest.rfind(')').unwrap_or(rest.len());
if paren_end > paren_start {
let params_str = &rest[paren_start + 1..paren_end];
for param in params_str.split(',') {
let param = param.trim();
if let Some(colon_pos) = param.find(':') {
let type_str = param[colon_pos + 1..].trim();
let (base_type, _generic_args) = parse_kotlin_type(type_str);
if !base_type.is_empty()
&& !matches!(
base_type.as_str(),
"String"
| "Int"
| "Boolean"
| "Long"
| "Double"
| "Float"
| "Any"
)
{
let id = make_id(&[&base_type]);
add_node_if_missing(
&mut fragment,
kt_node(id.clone(), base_type.clone(), "code", path),
);
fragment.edges.push(Edge {
source: func_id.clone(),
target: id,
relation: "references".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: Some("parameter_type".to_string()),
});
}
}
}
}
}
continue;
}
// Property/field declaration: `var name: Type` or `val name: Type`
if let Some(rest) = trimmed
.strip_prefix("var ")
.or_else(|| trimmed.strip_prefix("val "))
{
if let Some(owner) = ¤t_class {
if let Some(colon_pos) = rest.find(':') {
let type_str = rest[colon_pos + 1..].split('=').next().unwrap_or("").trim();
let (base_type, _) = parse_kotlin_type(type_str);
if !base_type.is_empty()
&& !matches!(
base_type.as_str(),
"String" | "Int" | "Boolean" | "Long" | "Double" | "Float"
)
{
let id = make_id(&[&base_type]);
add_node_if_missing(
&mut fragment,
kt_node(id.clone(), base_type, "code", path),
);
fragment.edges.push(Edge {
source: owner.clone(),
target: id,
relation: "references".to_string(),
confidence: "EXTRACTED".to_string(),
source_file: Some(path.to_string_lossy().to_string()),
weight: 1.0,
context: Some("field".to_string()),
});
}
}
}
continue;
}
// Track closing of class body (simple heuristic: line with just "}")
if trimmed == "}" {
// Don't pop current_class on every '}' - keep it for the whole file
// since Kotlin functions can be nested inside class body
}
}
Ok(fragment)
}
}
impl LanguageExtractor for TsKotlinExtractor {
fn file_extensions(&self) -> Vec<&'static str> {
vec!["kt", "kts"]
}
fn extract(&self, source: &[u8], path: &Path) -> Result<ExtractionFragment> {
Self::extract(source, path)
}
fn resolve_imports(&self, _imports: &[ImportNode]) -> Vec<Edge> {
vec![]
}
fn collect_type_refs(&self, _fragment: &mut ExtractionFragment) {}
}