use std::time::{Instant, SystemTime, UNIX_EPOCH};
use tree_sitter::{Node as TsNode, Parser, Tree};
use crate::extraction::complexity::{count_complexity, ComplexityMetrics, OCAML_COMPLEXITY};
use crate::types::{
generate_node_id, Edge, EdgeKind, ExtractionResult, Node, NodeKind, UnresolvedRef, Visibility,
};
pub struct OcamlExtractor;
struct ExtractionState {
nodes: Vec<Node>,
edges: Vec<Edge>,
unresolved_refs: Vec<UnresolvedRef>,
errors: Vec<String>,
node_stack: Vec<(String, String)>,
file_path: String,
source: Vec<u8>,
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();
Self {
nodes: Vec::new(),
edges: Vec::new(),
unresolved_refs: Vec::new(),
errors: Vec::new(),
node_stack: Vec::new(),
file_path: file_path.to_string(),
source: source.as_bytes().to_vec(),
timestamp,
}
}
fn qualified_prefix(&self) -> String {
let mut parts = vec![self.file_path.clone()];
for (name, _) in &self.node_stack {
parts.push(name.clone());
}
parts.join("::")
}
fn parent_node_id(&self) -> Option<&str> {
self.node_stack.last().map(|(_, id)| id.as_str())
}
fn node_text(&self, node: TsNode<'_>) -> String {
node.utf8_text(&self.source)
.unwrap_or("<invalid utf8>")
.to_string()
}
}
impl OcamlExtractor {
pub fn extract_ocaml(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: generate_node_id(file_path, &NodeKind::File, file_path, 0),
kind: NodeKind::File,
name: file_path.to_string(),
qualified_name: file_path.to_string(),
file_path: file_path.to_string(),
start_line: 0,
attrs_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,
};
let file_node_id = file_node.id.clone();
state.nodes.push(file_node);
state.node_stack.push((file_path.to_string(), file_node_id));
let root = tree.root_node();
Self::visit_children(&mut state, root);
state.node_stack.pop();
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("ocaml");
parser
.set_language(&language)
.map_err(|e| format!("failed to load OCaml 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() {
"value_definition" => Self::visit_value_definition(state, node),
"type_definition" => Self::visit_type_definition(state, node),
"module_definition" => Self::visit_module_definition(state, node),
"class_definition" => Self::visit_class_definition(state, node),
"open_module" => Self::visit_open(state, node),
"structure_item" | "signature_item" | "structure" | "signature" => {
Self::visit_children(state, node);
}
_ => {}
}
}
fn visit_value_definition(state: &mut ExtractionState, node: TsNode<'_>) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "let_binding" {
Self::visit_let_binding(state, child);
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_let_binding(state: &mut ExtractionState, node: TsNode<'_>) {
let Some(pattern) = node.child_by_field_name("pattern") else {
return;
};
let name = Self::extract_value_name(state, pattern);
let Some(name) = name else { return };
let is_fn = node.child_by_field_name("parameters").is_some()
|| node
.child_by_field_name("body")
.is_some_and(|b| matches!(b.kind(), "fun_expression" | "function_expression"));
let kind = if is_fn {
NodeKind::Function
} else {
NodeKind::Const
};
let docstring = Self::extract_docstring(state, node);
let sig = Self::first_line(state, node);
let start_line = node.start_position().row as u32;
let qualified_name = format!("{}::{}", state.qualified_prefix(), name);
let id = generate_node_id(&state.file_path, &kind, &name, start_line);
let metrics = if is_fn && node.child_count() > 0 {
count_complexity(node, &OCAML_COMPLEXITY, &state.source)
} else {
ComplexityMetrics::default()
};
let graph_node = Node {
id: id.clone(),
kind,
name: name.clone(),
qualified_name,
file_path: state.file_path.clone(),
start_line,
attrs_start_line: 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,
visibility: Visibility::Pub,
is_async: false,
branches: metrics.branches,
loops: metrics.loops,
returns: metrics.returns,
max_nesting: metrics.max_nesting,
unsafe_blocks: 0,
unchecked_calls: metrics.unchecked_calls,
assertions: metrics.assertions,
updated_at: state.timestamp,
};
state.nodes.push(graph_node);
if let Some(parent_id) = state.parent_node_id() {
state.edges.push(Edge {
source: parent_id.to_string(),
target: id.clone(),
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
if is_fn {
if let Some(body) = node.child_by_field_name("body") {
Self::extract_calls(state, body, &id);
}
}
}
fn visit_type_definition(state: &mut ExtractionState, node: TsNode<'_>) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "type_binding" {
if let Some(name_node) = child.child_by_field_name("name") {
let name = state.node_text(name_node);
let start_line = child.start_position().row as u32;
let qualified_name = format!("{}::{}", state.qualified_prefix(), name);
let id =
generate_node_id(&state.file_path, &NodeKind::Class, &name, start_line);
let sig = Self::first_line(state, child);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Class,
name,
qualified_name,
file_path: state.file_path.clone(),
start_line,
attrs_start_line: start_line,
end_line: child.end_position().row as u32,
start_column: child.start_position().column as u32,
end_column: child.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);
if let Some(parent_id) = state.parent_node_id() {
state.edges.push(Edge {
source: parent_id.to_string(),
target: id,
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
}
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_module_definition(state: &mut ExtractionState, node: TsNode<'_>) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "module_binding" {
if let Some(name_node) = child.child_by_field_name("name") {
let name = state.node_text(name_node);
let start_line = child.start_position().row as u32;
let qualified_name = format!("{}::{}", state.qualified_prefix(), name);
let id = generate_node_id(
&state.file_path,
&NodeKind::Module,
&name,
start_line,
);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Module,
name: name.clone(),
qualified_name,
file_path: state.file_path.clone(),
start_line,
attrs_start_line: start_line,
end_line: child.end_position().row as u32,
start_column: child.start_position().column as u32,
end_column: child.end_position().column as u32,
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(graph_node);
if let Some(parent_id) = state.parent_node_id() {
state.edges.push(Edge {
source: parent_id.to_string(),
target: id.clone(),
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
state.node_stack.push((name, id));
if let Some(body) = child.child_by_field_name("body") {
Self::visit_children(state, body);
}
state.node_stack.pop();
}
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_class_definition(state: &mut ExtractionState, node: TsNode<'_>) {
let mut cursor = node.walk();
if cursor.goto_first_child() {
loop {
let child = cursor.node();
if child.kind() == "class_binding" {
if let Some(name_node) = child.child_by_field_name("name") {
let name = state.node_text(name_node);
let start_line = child.start_position().row as u32;
let qualified_name = format!("{}::{}", state.qualified_prefix(), name);
let id =
generate_node_id(&state.file_path, &NodeKind::Class, &name, start_line);
let sig = Self::first_line(state, child);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Class,
name,
qualified_name,
file_path: state.file_path.clone(),
start_line,
attrs_start_line: start_line,
end_line: child.end_position().row as u32,
start_column: child.start_position().column as u32,
end_column: child.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);
if let Some(parent_id) = state.parent_node_id() {
state.edges.push(Edge {
source: parent_id.to_string(),
target: id,
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
}
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn visit_open(state: &mut ExtractionState, node: TsNode<'_>) {
let text = state.node_text(node);
let name = text
.split_whitespace()
.nth(1)
.unwrap_or("?")
.trim_end_matches(';')
.to_string();
let start_line = node.start_position().row as u32;
let id = generate_node_id(&state.file_path, &NodeKind::Use, &name, start_line);
let graph_node = Node {
id: id.clone(),
kind: NodeKind::Use,
name,
qualified_name: format!("{}::open", state.file_path),
file_path: state.file_path.clone(),
start_line,
attrs_start_line: 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::Private,
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);
if let Some(parent_id) = state.parent_node_id() {
state.edges.push(Edge {
source: parent_id.to_string(),
target: id,
kind: EdgeKind::Contains,
line: Some(start_line),
});
}
}
fn extract_value_name(state: &ExtractionState, pattern: TsNode<'_>) -> Option<String> {
match pattern.kind() {
"value_name" => {
if let Some(inner) = pattern.child(0) {
return Some(state.node_text(inner));
}
Some(state.node_text(pattern))
}
"identifier" => Some(state.node_text(pattern)),
_ => 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() == "application_expression" {
if let Some(callee) = child.child(0) {
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 if !matches!(child.kind(), "let_binding" | "fun_expression") {
Self::extract_calls(state, child, fn_id);
}
if !cursor.goto_next_sibling() {
break;
}
}
}
}
fn extract_docstring(state: &ExtractionState, node: TsNode<'_>) -> Option<String> {
let prev = node.prev_named_sibling()?;
if prev.kind() == "attribute" {
let text = state.node_text(prev);
if text.contains("@doc") || text.contains("@ocaml.doc") {
return Some(text.trim_matches('[').trim_matches(']').trim().to_string());
}
}
None
}
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 OcamlExtractor {
fn extensions(&self) -> &[&str] {
&["ml", "mli"]
}
fn language_name(&self) -> &'static str {
"OCaml"
}
fn extract(&self, file_path: &str, source: &str) -> ExtractionResult {
Self::extract_ocaml(file_path, source)
}
}