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""" |
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C# AST parser — extracts classes, interfaces, structs, methods, and |
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imports (using directives) from .cs files using tree-sitter. |
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""" |
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import logging |
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from pathlib import Path |
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from navegador.graph.schema import EdgeType, NodeLabel |
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from navegador.graph.store import GraphStore |
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from navegador.ingestion.parser import LanguageParser |
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logger = logging.getLogger(__name__) |
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def _get_csharp_language(): |
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try: |
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import tree_sitter_c_sharp as tscsharp # type: ignore[import] |
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from tree_sitter import Language |
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return Language(tscsharp.language()) |
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except ImportError as e: |
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raise ImportError("Install tree-sitter-c-sharp: pip install tree-sitter-c-sharp") from e |
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25
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def _node_text(node, source: bytes) -> str: |
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return source[node.start_byte : node.end_byte].decode("utf-8", errors="replace") |
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class CSharpParser(LanguageParser): |
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"""Parses C# source files into the navegador graph.""" |
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def __init__(self) -> None: |
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from tree_sitter import Parser # type: ignore[import] |
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self._parser = Parser(_get_csharp_language()) |
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def parse_file(self, path: Path, repo_root: Path, store: GraphStore) -> dict[str, int]: |
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source = path.read_bytes() |
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tree = self._parser.parse(source) |
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rel_path = str(path.relative_to(repo_root)) |
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store.create_node( |
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NodeLabel.File, |
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{ |
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"name": path.name, |
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"path": rel_path, |
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"language": "csharp", |
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"line_count": source.count(b"\n"), |
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}, |
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) |
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stats = {"functions": 0, "classes": 0, "edges": 0} |
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self._walk(tree.root_node, source, rel_path, store, stats, class_name=None) |
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return stats |
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# ── AST walker ──────────────────────────────────────────────────────────── |
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def _walk( |
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self, |
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node, |
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source: bytes, |
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file_path: str, |
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store: GraphStore, |
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stats: dict, |
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class_name: str | None, |
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) -> None: |
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if node.type in ( |
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"class_declaration", |
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"interface_declaration", |
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"struct_declaration", |
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"record_declaration", |
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): |
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self._handle_class(node, source, file_path, store, stats) |
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return |
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if node.type in ("method_declaration", "constructor_declaration"): |
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self._handle_method(node, source, file_path, store, stats, class_name) |
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return |
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if node.type == "using_directive": |
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self._handle_using(node, source, file_path, store, stats) |
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return |
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for child in node.children: |
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self._walk(child, source, file_path, store, stats, class_name) |
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# ── Handlers ────────────────────────────────────────────────────────────── |
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def _handle_class( |
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
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) -> None: |
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name_node = node.child_by_field_name("name") |
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if not name_node: |
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name_node = next((c for c in node.children if c.type == "identifier"), None) |
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if not name_node: |
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return |
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name = _node_text(name_node, source) |
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store.create_node( |
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NodeLabel.Class, |
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{ |
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"name": name, |
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"file_path": file_path, |
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"line_start": node.start_point[0] + 1, |
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"line_end": node.end_point[0] + 1, |
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"docstring": "", |
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}, |
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) |
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store.create_edge( |
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NodeLabel.File, |
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{"path": file_path}, |
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EdgeType.CONTAINS, |
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NodeLabel.Class, |
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{"name": name, "file_path": file_path}, |
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) |
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stats["classes"] += 1 |
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stats["edges"] += 1 |
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# Superclass / interfaces |
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bases = node.child_by_field_name("bases") |
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if bases: |
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for child in bases.children: |
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if child.type == "identifier": |
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parent_name = _node_text(child, source) |
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store.create_edge( |
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NodeLabel.Class, |
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{"name": name, "file_path": file_path}, |
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EdgeType.INHERITS, |
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NodeLabel.Class, |
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{"name": parent_name, "file_path": file_path}, |
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) |
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stats["edges"] += 1 |
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# Walk class body for methods |
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body = node.child_by_field_name("body") |
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if not body: |
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body = next((c for c in node.children if c.type == "declaration_list"), None) |
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if body: |
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for child in body.children: |
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if child.type in ("method_declaration", "constructor_declaration"): |
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self._handle_method(child, source, file_path, store, stats, class_name=name) |
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141
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def _handle_method( |
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self, |
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node, |
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source: bytes, |
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file_path: str, |
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store: GraphStore, |
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stats: dict, |
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class_name: str | None, |
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149
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) -> None: |
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name_node = node.child_by_field_name("name") |
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if not name_node: |
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name_node = next((c for c in node.children if c.type == "identifier"), None) |
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if not name_node: |
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return |
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name = _node_text(name_node, source) |
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label = NodeLabel.Method if class_name else NodeLabel.Function |
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store.create_node( |
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label, |
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{ |
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"name": name, |
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"file_path": file_path, |
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"line_start": node.start_point[0] + 1, |
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"line_end": node.end_point[0] + 1, |
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"docstring": "", |
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166
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"class_name": class_name or "", |
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167
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}, |
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) |
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169
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170
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container_label = NodeLabel.Class if class_name else NodeLabel.File |
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container_key = ( |
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{"name": class_name, "file_path": file_path} if class_name else {"path": file_path} |
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) |
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store.create_edge( |
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container_label, |
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container_key, |
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EdgeType.CONTAINS, |
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label, |
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{"name": name, "file_path": file_path}, |
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) |
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181
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stats["functions"] += 1 |
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182
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stats["edges"] += 1 |
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183
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184
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self._extract_calls(node, source, file_path, name, label, store, stats) |
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185
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186
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def _handle_using( |
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187
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
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188
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) -> None: |
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189
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raw = _node_text(node, source).strip() |
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190
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# "using System.Collections.Generic;" or "using static ..." |
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191
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module = raw.removeprefix("using").removeprefix(" static").removesuffix(";").strip() |
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192
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if not module: |
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return |
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194
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store.create_node( |
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195
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NodeLabel.Import, |
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196
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{ |
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197
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"name": module, |
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198
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"file_path": file_path, |
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199
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"line_start": node.start_point[0] + 1, |
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200
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"module": module, |
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201
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}, |
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202
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) |
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203
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store.create_edge( |
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204
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NodeLabel.File, |
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205
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{"path": file_path}, |
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206
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EdgeType.IMPORTS, |
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207
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NodeLabel.Import, |
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208
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{"name": module, "file_path": file_path}, |
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) |
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210
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stats["edges"] += 1 |
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211
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212
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def _extract_calls( |
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213
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self, |
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214
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fn_node, |
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215
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source: bytes, |
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216
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file_path: str, |
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217
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fn_name: str, |
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218
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fn_label: str, |
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219
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store: GraphStore, |
|
220
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stats: dict, |
|
221
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) -> None: |
|
222
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def walk(node): |
|
223
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if node.type == "invocation_expression": |
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224
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func = node.child_by_field_name("function") |
|
225
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if not func: |
|
226
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func = next( |
|
227
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( |
|
228
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c |
|
229
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for c in node.children |
|
230
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if c.type in ("identifier", "member_access_expression") |
|
231
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), |
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232
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None, |
|
233
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) |
|
234
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if func: |
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235
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callee = _node_text(func, source).split(".")[-1] |
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236
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store.create_edge( |
|
237
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fn_label, |
|
238
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{"name": fn_name, "file_path": file_path}, |
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239
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EdgeType.CALLS, |
|
240
|
NodeLabel.Function, |
|
241
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{"name": callee, "file_path": file_path}, |
|
242
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) |
|
243
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stats["edges"] += 1 |
|
244
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for child in node.children: |
|
245
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walk(child) |
|
246
|
|
|
247
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body = fn_node.child_by_field_name("body") |
|
248
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if not body: |
|
249
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body = next((c for c in fn_node.children if c.type == "block"), None) |
|
250
|
if body: |
|
251
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walk(body) |
|
252
|
|