use std::time::{Instant, SystemTime, UNIX_EPOCH};
use tree_sitter::{Node as TsNode, Parser, Tree};
use crate::types::{
generate_node_id, Edge, EdgeKind, ExtractionResult, Node, NodeKind, UnresolvedRef, Visibility,
};
pub struct ErlangExtractor;
struct ExtractionState {
nodes: Vec<Node>,
edges: Vec<Edge>,
unresolved_refs: Vec<UnresolvedRef>,
errors: Vec<String>,
file_path: String,
source: Vec<u8>,
file_node_id: String,
timestamp: u64,
}
impl ExtractionState {
fn new(file_path: &str, source: &str) -> Self {
let timestamp = SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap_or_default()
.as_secs();
let file_node_id = generate_node_id(file_path, &NodeKind::File, file_path, 0);
Self {
nodes: Vec::new(),
edges: Vec::new(),
unresolved_refs: Vec::new(),
errors: Vec::new(),
file_path: file_path.to_string(),
source: source.as_bytes().to_vec(),
file_node_id,
timestamp,
}
}
fn node_text(&self, node: TsNode<'_>) -> String {
node.utf8_text(&self.source)
.unwrap_or("<invalid utf8>")
.to_string()
}
}
impl ErlangExtractor {
pub fn extract_erlang(file_path: &str, source: &str) -> ExtractionResult {
let start = Instant::now();
let mut state = ExtractionState::new(file_path, source);
let tree = match Self::parse_source(source) {
Ok(t) => t,
Err(msg) => {
state.errors.push(msg);
return Self::build_result(state, start);
}
};
let file_node = Node {
id: state.file_node_id.clone(),
kind: NodeKind::File,
name: file_path.to_string(),
qualified_name: file_path.to_string(),
file_path: file_path.to_string(),
start_line: 0,
end_line: source.lines().count().saturating_sub(1) as u32,
start_column: 0,
end_column: 0,
signature: None,
docstring: None,
visibility: Visibility::Pub,
is_async: false,
branches: 0,
loops: 0,
returns: 0,
max_nesting: 0,
unsafe_blocks: 0,
unchecked_calls: 0,
assertions: 0,
updated_at: state.timestamp,
};
state.nodes.push(file_node);
let root = tree.root_node();
Self::visit_children(&mut state, root);
Self::build_result(state, start)
}
fn parse_source(source: &str) -> Result<Tree, String> {
let mut parser = Parser::new();
let language = crate::extraction::ts_provider::language("erlang");
parser
.set_language(&language)
.map_err(|e| format!("failed to load Erlang grammar: {e}"))?;
parser
.parse(source, None)
.ok_or_else(|| "tree-sitter parse returned None".to_string())
}
fn visit_children(state: &mut ExtractionState, node: TsNode<'_>) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
Self::visit_node(state, cursor.node());
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_node(state: &mut ExtractionState, node: TsNode<'_>) {
match node.kind() {
"fun_decl" => Self::visit_fun_decl(state, node),
"module_attribute" => Self::visit_module_attr(state, node),
"type_alias" | "opaque" => Self::visit_type(state, node),
"spec" => Self::visit_spec(state, node),
_ => Self::visit_children(state, node),
}
}
fn visit_fun_decl(state: &mut ExtractionState, node: TsNode<'_>) {
let Some(first_clause) = Self::find_child(node, "function_clause") else {
return;
};
let name = Self::extract_atom_name(state, first_clause)
.unwrap_or_else(|| "<anonymous>".to_string());
let sig = Self::first_line(state, node);
let start_line = node.start_position().row as u32;
let arity = Self::count_arity(first_clause);
let full_name = format!("{}/{}", name, arity);
let qualified_name = format!("{}::{}", state.file_path, full_name);
let id = generate_node_id(
&state.file_path,
&NodeKind::Function,
&full_name,
start_line,
);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Function,
name: full_name,
qualified_name,
file_path: state.file_path.clone(),
start_line,
end_line: node.end_position().row as u32,
start_column: node.start_position().column as u32,
end_column: node.end_position().column as u32,
signature: sig,
docstring: None,
visibility: Visibility::Pub,
is_async: false,
branches: 0,
loops: 0,
returns: 0,
max_nesting: 0,
unsafe_blocks: 0,
unchecked_calls: 0,
assertions: 0,
updated_at: state.timestamp,
};
state.nodes.push(graph_node);
state.edges.push(Edge {
source: state.file_node_id.clone(),
target: id.clone(),
kind: EdgeKind::Contains,
line: Some(start_line),
});
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "function_clause" {
if let Some(body) = child.child_by_field_name("body") {
Self::extract_calls(state, body, &id);
}
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_module_attr(state: &mut ExtractionState, node: TsNode<'_>) {
let text = state.node_text(node);
if !text.starts_with("-module") {
return;
}
let name = Self::extract_attr_value(state, node).unwrap_or_else(|| "?".to_string());
let start_line = node.start_position().row as u32;
let id = generate_node_id(&state.file_path, &NodeKind::Module, &name, start_line);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Module,
name,
qualified_name: format!("{}::module", state.file_path),
file_path: state.file_path.clone(),
start_line,
end_line: node.end_position().row as u32,
start_column: node.start_position().column as u32,
end_column: node.end_position().column as u32,
signature: Some(text.trim().to_string()),
docstring: None,
visibility: Visibility::Pub,
is_async: false,
branches: 0,
loops: 0,
returns: 0,
max_nesting: 0,
unsafe_blocks: 0,
unchecked_calls: 0,
assertions: 0,
updated_at: state.timestamp,
};
state.nodes.push(graph_node);
state.edges.push(Edge {
source: state.file_node_id.clone(),
target: id,
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
fn visit_type(state: &mut ExtractionState, node: TsNode<'_>) {
let name = Self::extract_attr_value(state, node).unwrap_or_else(|| "?".to_string());
let start_line = node.start_position().row as u32;
let sig = Self::first_line(state, node);
let id = generate_node_id(&state.file_path, &NodeKind::Class, &name, start_line);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Class,
name,
qualified_name: format!("{}::type", state.file_path),
file_path: state.file_path.clone(),
start_line,
end_line: node.end_position().row as u32,
start_column: node.start_position().column as u32,
end_column: node.end_position().column as u32,
signature: sig,
docstring: None,
visibility: Visibility::Pub,
is_async: false,
branches: 0,
loops: 0,
returns: 0,
max_nesting: 0,
unsafe_blocks: 0,
unchecked_calls: 0,
assertions: 0,
updated_at: state.timestamp,
};
state.nodes.push(graph_node);
state.edges.push(Edge {
source: state.file_node_id.clone(),
target: id,
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
fn visit_spec(state: &mut ExtractionState, node: TsNode<'_>) {
let text = state.node_text(node);
let start_line = node.start_position().row as u32;
if let Some(name) = Self::extract_attr_value(state, node) {
state.unresolved_refs.push(UnresolvedRef {
from_node_id: state.file_node_id.clone(),
reference_name: name,
reference_kind: EdgeKind::Calls,
line: start_line,
column: 0,
file_path: state.file_path.clone(),
});
}
let _ = text;
}
fn find_child<'a>(node: TsNode<'a>, kind: &str) -> Option<TsNode<'a>> {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == kind {
return Some(child);
}
if !cursor.goto_next_sibling() {
break;
}
}
}
None
}
fn extract_atom_name(state: &ExtractionState, clause: TsNode<'_>) -> Option<String> {
if let Some(n) = clause.child_by_field_name("name") {
return Some(state.node_text(n));
}
let mut cursor = clause.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "atom" {
return Some(state.node_text(child));
}
if !cursor.goto_next_sibling() {
break;
}
}
}
None
}
fn count_arity(clause: TsNode<'_>) -> usize {
if let Some(args) = clause.child_by_field_name("args") {
return args.named_child_count();
}
let mut cursor = clause.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if matches!(
child.kind(),
"clause_args" | "argument_list" | "pat_argument_list"
) {
return child.named_child_count();
}
if !cursor.goto_next_sibling() {
break;
}
}
}
0
}
fn extract_attr_value(state: &ExtractionState, node: TsNode<'_>) -> Option<String> {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "atom" {
let text = state.node_text(child);
if !matches!(
text.as_str(),
"module" | "type" | "opaque" | "spec" | "callback"
) {
return Some(text);
}
}
if !cursor.goto_next_sibling() {
break;
}
}
}
None
}
fn extract_calls(state: &mut ExtractionState, node: TsNode<'_>, fn_id: &str) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "call" {
if let Some(callee) = child.child_by_field_name("function") {
let name = state.node_text(callee);
state.unresolved_refs.push(UnresolvedRef {
from_node_id: fn_id.to_string(),
reference_name: name,
reference_kind: EdgeKind::Calls,
line: child.start_position().row as u32,
column: child.start_position().column as u32,
file_path: state.file_path.clone(),
});
}
Self::extract_calls(state, child, fn_id);
} else {
Self::extract_calls(state, child, fn_id);
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn first_line(state: &ExtractionState, node: TsNode<'_>) -> Option<String> {
let text = state.node_text(node);
text.lines().next().map(|l| l.trim().to_string())
}
fn build_result(state: ExtractionState, start: Instant) -> ExtractionResult {
ExtractionResult {
nodes: state.nodes,
edges: state.edges,
unresolved_refs: state.unresolved_refs,
errors: state.errors,
duration_ms: start.elapsed().as_millis() as u64,
}
}
}
impl crate::extraction::LanguageExtractor for ErlangExtractor {
fn extensions(&self) -> &[&str] {
&["erl", "hrl"]
}
fn language_name(&self) -> &'static str {
"Erlang"
}
fn extract(&self, file_path: &str, source: &str) -> ExtractionResult {
Self::extract_erlang(file_path, source)
}
}