Supported Languages

symtrace v0.5.0 provides first-class AST parsing and structural analysis for 13 programming languages and data formats.

Language Support Matrix

Language	Extensions	Key Entity Identifiers Analyzed
Rust	.rs (Rust 2021 & 2024 Edition)	function_item, struct_item, enum_item, impl_item, trait_item, macro_definition
JavaScript	.js, .jsx, .mjs, .cjs	function_declaration, class_declaration, method_definition, arrow_function
TypeScript / TSX	.ts, .tsx	function_declaration, class_declaration, interface_declaration, type_alias, jsx_element
Python	.py, .pyi	function_definition, class_definition, async_function_definition
Java	.java	method_declaration, class_declaration, interface_declaration, constructor_declaration
C	.c, .h	function_definition, struct_specifier, enum_specifier, type_definition
C++	.cpp, .hpp, .cc, .cxx, .h++	function_definition, class_specifier, namespace_definition, template_declaration
Go	.go	function_declaration, method_declaration, type_declaration, type_spec
C#	.cs	method_declaration, class_declaration, interface_declaration, property_declaration
Ruby	.rb	method, class, module
PHP	.php	method_declaration, class_declaration, function_definition
JSON	.json, .jsonc	pair, object, array

Custom Query DSL Rules (.scm)

In addition to built-in entity node types, you can define custom AST query targets using standard Tree-Sitter .scm rules placed in .symtrace/queries/. See Custom Query DSL Guide →.

Mixed-Language Repositories

Files with unsupported file extensions are skipped gracefully: zero errors, zero clutter. You can safely run symtrace against any repository regardless of content.

Language Detection Logic

Language mapping is determined strictly by file extension. There is no runtime shebang parsing or content sniffing, guaranteeing fast and deterministic detection.