use crate::parser::language::{
Export, Import, LanguageSupport, ParseResult, Symbol, SymbolKind, Visibility,
};
use tree_sitter::Language as TsLanguage;
pub struct KotlinLanguage;
impl KotlinLanguage {
fn node_text<'a>(node: &tree_sitter::Node, source: &'a [u8]) -> &'a str {
node.utf8_text(source).unwrap_or("")
}
fn first_line(node: &tree_sitter::Node, source: &[u8]) -> String {
let text = Self::node_text(node, source);
text.lines().next().unwrap_or("").trim().to_string()
}
fn extract_name(node: &tree_sitter::Node, source: &[u8]) -> String {
if let Some(name_node) = node.child_by_field_name("name") {
return Self::node_text(&name_node, source).to_string();
}
let mut cursor = node.walk();
for child in node.children(&mut cursor) {
if child.kind() == "identifier" || child.kind() == "simple_identifier" {
return Self::node_text(&child, source).to_string();
}
}
String::new()
}
fn extract_visibility(node: &tree_sitter::Node, source: &[u8]) -> Visibility {
let mut cursor = node.walk();
for child in node.children(&mut cursor) {
if child.kind() == "modifiers" {
let text = Self::node_text(&child, source);
if text.contains("private")
|| text.contains("protected")
|| text.contains("internal")
{
return Visibility::Private;
}
}
}
Visibility::Public
}
fn extract_fn_body(node: &tree_sitter::Node, source: &[u8]) -> String {
let mut cursor = node.walk();
for child in node.children(&mut cursor) {
if child.kind() == "function_body" || child.kind() == "block" {
let text = &source[child.start_byte()..child.end_byte()];
return String::from_utf8_lossy(text).into_owned();
}
}
String::new()
}
fn extract_fn_signature(node: &tree_sitter::Node, source: &[u8]) -> String {
let full_text = Self::node_text(node, source);
let mut cursor = node.walk();
for child in node.children(&mut cursor) {
if child.kind() == "function_body" || child.kind() == "block" {
let body_start = child.start_byte() - node.start_byte();
return full_text[..body_start].trim().to_string();
}
}
full_text.lines().next().unwrap_or("").trim().to_string()
}
fn extract_import(node: &tree_sitter::Node, source: &[u8]) -> Option<Import> {
let text = Self::node_text(node, source);
let inner = text
.trim_start_matches("import")
.trim()
.trim_end_matches(';')
.trim();
if inner.is_empty() {
return None;
}
if inner.ends_with(".*") {
let source_path = inner.trim_end_matches(".*").to_string();
return Some(Import {
source: source_path,
names: vec!["*".to_string()],
});
}
if let Some(sep) = inner.rfind('.') {
let source_path = inner[..sep].to_string();
let name = inner[sep + 1..].to_string();
Some(Import {
source: source_path,
names: vec![name],
})
} else {
Some(Import {
source: String::new(),
names: vec![inner.to_string()],
})
}
}
}
impl LanguageSupport for KotlinLanguage {
fn ts_language(&self) -> TsLanguage {
tree_sitter_kotlin_ng::LANGUAGE.into()
}
fn name(&self) -> &str {
"kotlin"
}
fn extract(&self, source: &str, tree: &tree_sitter::Tree) -> ParseResult {
let source_bytes = source.as_bytes();
let root = tree.root_node();
let mut symbols: Vec<Symbol> = Vec::new();
let mut imports: Vec<Import> = Vec::new();
let mut exports: Vec<Export> = Vec::new();
let mut stack: Vec<tree_sitter::Node> = root.children(&mut root.walk()).collect();
while let Some(node) = stack.pop() {
match node.kind() {
"import" => {
if let Some(imp) = Self::extract_import(&node, source_bytes) {
imports.push(imp);
}
}
"function_declaration" => {
let name = Self::extract_name(&node, source_bytes);
let visibility = Self::extract_visibility(&node, source_bytes);
let is_pub = visibility == Visibility::Public;
let signature = Self::extract_fn_signature(&node, source_bytes);
let body = Self::extract_fn_body(&node, source_bytes);
let start_line = node.start_position().row + 1;
let end_line = node.end_position().row + 1;
if is_pub {
exports.push(Export {
name: name.clone(),
kind: SymbolKind::Function,
});
}
symbols.push(Symbol {
name,
kind: SymbolKind::Function,
visibility,
signature,
body,
start_line,
end_line,
});
}
"class_declaration" => {
let name = Self::extract_name(&node, source_bytes);
let visibility = Self::extract_visibility(&node, source_bytes);
let is_pub = visibility == Visibility::Public;
let signature = Self::first_line(&node, source_bytes);
let body = Self::node_text(&node, source_bytes).to_string();
let start_line = node.start_position().row + 1;
let end_line = node.end_position().row + 1;
if is_pub {
exports.push(Export {
name: name.clone(),
kind: SymbolKind::Class,
});
}
symbols.push(Symbol {
name,
kind: SymbolKind::Class,
visibility,
signature,
body,
start_line,
end_line,
});
let mut cursor = node.walk();
for child in node.children(&mut cursor) {
if child.kind() == "class_body" || child.kind() == "enum_class_body" {
let mut inner = child.walk();
for grandchild in child.children(&mut inner) {
stack.push(grandchild);
}
}
}
}
"object_declaration" => {
let name = Self::extract_name(&node, source_bytes);
let visibility = Self::extract_visibility(&node, source_bytes);
let is_pub = visibility == Visibility::Public;
let signature = Self::first_line(&node, source_bytes);
let body = Self::node_text(&node, source_bytes).to_string();
let start_line = node.start_position().row + 1;
let end_line = node.end_position().row + 1;
if is_pub {
exports.push(Export {
name: name.clone(),
kind: SymbolKind::Class,
});
}
symbols.push(Symbol {
name,
kind: SymbolKind::Class,
visibility,
signature,
body,
start_line,
end_line,
});
}
_ => {}
}
}
ParseResult {
symbols,
imports,
exports,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::parser::language::{SymbolKind, Visibility};
fn make_parser() -> tree_sitter::Parser {
let mut parser = tree_sitter::Parser::new();
parser
.set_language(&tree_sitter_kotlin_ng::LANGUAGE.into())
.expect("failed to set language");
parser
}
#[test]
fn test_extract_function_public_by_default() {
let source = r#"fun greet(name: String): String {
return "Hello, $name!"
}
"#;
let mut parser = make_parser();
let tree = parser.parse(source, None).expect("parse failed");
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let funcs: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Function)
.collect();
assert!(!funcs.is_empty(), "expected function symbol");
assert_eq!(funcs[0].name, "greet");
assert_eq!(funcs[0].visibility, Visibility::Public);
let exported: Vec<_> = result
.exports
.iter()
.filter(|e| e.name == "greet")
.collect();
assert!(!exported.is_empty(), "greet should be exported");
}
#[test]
fn test_extract_class() {
let source = r#"class Animal(val name: String) {
fun speak(): String = "..."
}
"#;
let mut parser = make_parser();
let tree = parser.parse(source, None).expect("parse failed");
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let classes: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Class)
.collect();
assert!(!classes.is_empty(), "expected class symbol");
assert_eq!(classes[0].name, "Animal");
assert_eq!(classes[0].visibility, Visibility::Public);
}
#[test]
fn test_extract_import() {
let source = r#"import kotlin.collections.List
import java.util.HashMap
"#;
let mut parser = make_parser();
let tree = parser.parse(source, None).expect("parse failed");
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
assert_eq!(
result.imports.len(),
2,
"expected 2 imports, got {:?}",
result.imports
);
let names: Vec<&str> = result
.imports
.iter()
.flat_map(|i| i.names.iter().map(|n| n.as_str()))
.collect();
assert!(
names.contains(&"List"),
"expected List import, got: {:?}",
names
);
assert!(
names.contains(&"HashMap"),
"expected HashMap import, got: {:?}",
names
);
}
#[test]
fn test_extract_data_class() {
let source = "data class User(val name: String, val age: Int)\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let classes: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Class)
.collect();
assert!(!classes.is_empty(), "expected data class symbol");
assert_eq!(classes[0].name, "User");
assert_eq!(classes[0].visibility, Visibility::Public);
}
#[test]
fn test_extract_object_declaration() {
let source = "object Singleton {\n val instance = 42\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let objects: Vec<_> = result
.symbols
.iter()
.filter(|s| s.name == "Singleton")
.collect();
assert!(!objects.is_empty(), "expected object symbol");
assert_eq!(objects[0].kind, SymbolKind::Class);
assert_eq!(objects[0].visibility, Visibility::Public);
}
#[test]
fn test_extract_private_function() {
let source = "private fun helper(): Int {\n return 42\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let funcs: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Function)
.collect();
assert!(!funcs.is_empty());
assert_eq!(funcs[0].name, "helper");
assert_eq!(funcs[0].visibility, Visibility::Private);
assert!(
result.exports.is_empty(),
"private function should not be exported"
);
}
#[test]
fn test_extract_extension_function() {
let source = "fun String.addExclamation(): String {\n return this + \"!\"\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let funcs: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Function)
.collect();
assert!(!funcs.is_empty(), "expected extension function");
}
#[test]
fn test_extract_sealed_class() {
let source = "sealed class Result {\n class Success(val data: String) : Result()\n class Error(val msg: String) : Result()\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let classes: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Class)
.collect();
assert!(!classes.is_empty(), "expected sealed class");
assert!(
classes.iter().any(|c| c.name == "Result"),
"expected Result class"
);
}
#[test]
fn test_extract_wildcard_import() {
let source = "import kotlin.collections.*\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
assert_eq!(result.imports.len(), 1);
assert!(result.imports[0].names.contains(&"*".to_string()));
assert_eq!(result.imports[0].source, "kotlin.collections");
}
#[test]
fn test_empty_source() {
let source = "";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
assert!(result.symbols.is_empty());
assert!(result.imports.is_empty());
assert!(result.exports.is_empty());
}
#[test]
fn test_extract_function_with_body() {
let source = "fun add(a: Int, b: Int): Int {\n return a + b\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let funcs: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Function)
.collect();
assert!(!funcs.is_empty());
assert!(!funcs[0].body.is_empty(), "expected function body");
assert!(
!funcs[0].signature.is_empty(),
"expected function signature"
);
}
#[test]
fn test_extract_multiple_functions() {
let source = "fun foo(): Unit {}\nfun bar(): Unit {}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let funcs: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Function)
.collect();
assert_eq!(funcs.len(), 2);
assert_eq!(result.exports.len(), 2);
}
#[test]
fn test_extract_bare_identifier_import() {
let source = "import SomeClass\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
assert_eq!(result.imports.len(), 1);
assert!(
result.imports[0].names.contains(&"SomeClass".to_string()),
"expected bare identifier import, got: {:?}",
result.imports[0]
);
}
#[test]
fn test_extract_interface() {
let source = "interface Drawable {\n fun draw()\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let classes: Vec<_> = result
.symbols
.iter()
.filter(|s| s.kind == SymbolKind::Class)
.collect();
assert!(
!classes.is_empty(),
"expected interface as class, got: {:?}",
result
.symbols
.iter()
.map(|s| (&s.name, &s.kind))
.collect::<Vec<_>>()
);
assert_eq!(classes[0].name, "Drawable");
}
#[test]
fn test_abstract_function_no_body() {
let source = "abstract class Base {\n abstract fun process(input: String): Boolean\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let _ = result;
}
#[test]
fn test_import_single_name() {
let source = "import SomeClass\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let _ = result;
}
#[test]
fn test_empty_import() {
let source = "import\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let _ = result;
}
#[test]
fn test_extract_name_fallback() {
let source = "class Foo {\n companion object {}\n}\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
let _ = result;
}
#[test]
fn test_wildcard_import() {
let source = "import kotlin.collections.*\n";
let mut parser = make_parser();
let tree = parser.parse(source, None).unwrap();
let lang = KotlinLanguage;
let result = lang.extract(source, &tree);
if !result.imports.is_empty() {
assert_eq!(result.imports[0].names, vec!["*".to_string()]);
}
}
}