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1
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""" |
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2
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Rust AST parser — extracts functions, methods (from impl blocks), |
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3
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structs/enums/traits, use declarations, and call edges from .rs files. |
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4
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""" |
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5
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6
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import logging |
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7
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from pathlib import Path |
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8
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9
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from navegador.graph.schema import EdgeType, NodeLabel |
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10
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from navegador.graph.store import GraphStore |
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11
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from navegador.ingestion.parser import LanguageParser |
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12
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13
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logger = logging.getLogger(__name__) |
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14
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15
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16
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def _get_rust_language(): |
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17
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try: |
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18
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import tree_sitter_rust as tsrust # type: ignore[import] |
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19
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from tree_sitter import Language |
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20
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21
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return Language(tsrust.language()) |
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22
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except ImportError as e: |
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23
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raise ImportError("Install tree-sitter-rust: pip install tree-sitter-rust") from e |
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24
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25
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26
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def _node_text(node, source: bytes) -> str: |
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27
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return source[node.start_byte : node.end_byte].decode("utf-8", errors="replace") |
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28
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29
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30
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def _doc_comment(node, source: bytes) -> str: |
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31
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"""Collect preceding /// doc-comment lines from siblings.""" |
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32
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parent = node.parent |
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33
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if not parent: |
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34
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return "" |
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35
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siblings = list(parent.children) |
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36
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idx = next((i for i, c in enumerate(siblings) if c.id == node.id), -1) |
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37
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if idx <= 0: |
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38
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return "" |
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39
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lines: list[str] = [] |
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40
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for i in range(idx - 1, -1, -1): |
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sib = siblings[i] |
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raw = _node_text(sib, source) |
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if sib.type == "line_comment" and raw.startswith("///"): |
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lines.insert(0, raw.lstrip("/").strip()) |
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else: |
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break |
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47
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return " ".join(lines) |
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48
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49
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50
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class RustParser(LanguageParser): |
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51
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"""Parses Rust source files into the navegador graph.""" |
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52
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53
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def __init__(self) -> None: |
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54
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from tree_sitter import Parser # type: ignore[import] |
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55
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56
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self._parser = Parser(_get_rust_language()) |
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57
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58
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def parse_file(self, path: Path, repo_root: Path, store: GraphStore) -> dict[str, int]: |
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59
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source = path.read_bytes() |
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60
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tree = self._parser.parse(source) |
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61
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rel_path = str(path.relative_to(repo_root)) |
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62
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63
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store.create_node( |
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64
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NodeLabel.File, |
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65
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{ |
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66
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"name": path.name, |
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"path": rel_path, |
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68
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"language": "rust", |
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69
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"line_count": source.count(b"\n"), |
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70
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}, |
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71
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) |
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72
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73
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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, impl_type=None) |
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75
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return stats |
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76
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77
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# ── AST walker ──────────────────────────────────────────────────────────── |
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78
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79
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def _walk( |
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80
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self, |
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81
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node, |
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82
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source: bytes, |
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83
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file_path: str, |
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84
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store: GraphStore, |
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85
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stats: dict, |
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86
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impl_type: str | None, |
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87
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) -> None: |
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88
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if node.type == "function_item": |
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89
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self._handle_function(node, source, file_path, store, stats, impl_type) |
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90
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return |
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91
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if node.type == "impl_item": |
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92
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self._handle_impl(node, source, file_path, store, stats) |
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93
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return |
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94
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if node.type in ("struct_item", "enum_item", "trait_item"): |
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95
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self._handle_type(node, source, file_path, store, stats) |
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96
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return |
|
97
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if node.type == "use_declaration": |
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98
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self._handle_use(node, source, file_path, store, stats) |
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99
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return |
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100
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for child in node.children: |
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101
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self._walk(child, source, file_path, store, stats, impl_type) |
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102
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|
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103
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# ── Handlers ────────────────────────────────────────────────────────────── |
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104
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105
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def _handle_function( |
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106
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self, |
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107
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node, |
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108
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source: bytes, |
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109
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file_path: str, |
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110
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store: GraphStore, |
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111
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stats: dict, |
|
112
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impl_type: str | None, |
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113
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) -> None: |
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114
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name_node = node.child_by_field_name("name") |
|
115
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if not name_node: |
|
116
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return |
|
117
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name = _node_text(name_node, source) |
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118
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docstring = _doc_comment(node, source) |
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119
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label = NodeLabel.Method if impl_type else NodeLabel.Function |
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120
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|
|
121
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store.create_node( |
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122
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label, |
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123
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{ |
|
124
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"name": name, |
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125
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"file_path": file_path, |
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126
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"line_start": node.start_point[0] + 1, |
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127
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"line_end": node.end_point[0] + 1, |
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128
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"docstring": docstring, |
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129
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"class_name": impl_type or "", |
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130
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}, |
|
131
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) |
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132
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133
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container_label = NodeLabel.Class if impl_type else NodeLabel.File |
|
134
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container_key = ( |
|
135
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{"name": impl_type, "file_path": file_path} if impl_type else {"path": file_path} |
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136
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) |
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137
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store.create_edge( |
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138
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container_label, |
|
139
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container_key, |
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140
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EdgeType.CONTAINS, |
|
141
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label, |
|
142
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{"name": name, "file_path": file_path}, |
|
143
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) |
|
144
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stats["functions"] += 1 |
|
145
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stats["edges"] += 1 |
|
146
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|
|
147
|
self._extract_calls(node, source, file_path, name, label, store, stats) |
|
148
|
|
|
149
|
def _handle_impl( |
|
150
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
|
151
|
) -> None: |
|
152
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type_node = node.child_by_field_name("type") |
|
153
|
impl_type_name = _node_text(type_node, source) if type_node else "" |
|
154
|
|
|
155
|
body = node.child_by_field_name("body") |
|
156
|
if body: |
|
157
|
for child in body.children: |
|
158
|
if child.type == "function_item": |
|
159
|
self._handle_function( |
|
160
|
child, source, file_path, store, stats, impl_type=impl_type_name or None |
|
161
|
) |
|
162
|
|
|
163
|
def _handle_type( |
|
164
|
self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
|
165
|
) -> None: |
|
166
|
name_node = node.child_by_field_name("name") |
|
167
|
if not name_node: |
|
168
|
return |
|
169
|
name = _node_text(name_node, source) |
|
170
|
kind = {"struct_item": "struct", "enum_item": "enum", "trait_item": "trait"}.get( |
|
171
|
node.type, "" |
|
172
|
) |
|
173
|
docstring = _doc_comment(node, source) |
|
174
|
|
|
175
|
store.create_node( |
|
176
|
NodeLabel.Class, |
|
177
|
{ |
|
178
|
"name": name, |
|
179
|
"file_path": file_path, |
|
180
|
"line_start": node.start_point[0] + 1, |
|
181
|
"line_end": node.end_point[0] + 1, |
|
182
|
"docstring": f"{kind}: {docstring}".strip(": ") if kind else docstring, |
|
183
|
}, |
|
184
|
) |
|
185
|
store.create_edge( |
|
186
|
NodeLabel.File, |
|
187
|
{"path": file_path}, |
|
188
|
EdgeType.CONTAINS, |
|
189
|
NodeLabel.Class, |
|
190
|
{"name": name, "file_path": file_path}, |
|
191
|
) |
|
192
|
stats["classes"] += 1 |
|
193
|
stats["edges"] += 1 |
|
194
|
|
|
195
|
def _handle_use( |
|
196
|
self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
|
197
|
) -> None: |
|
198
|
raw = _node_text(node, source) |
|
199
|
module = raw.removeprefix("use ").removesuffix(";").strip() |
|
200
|
store.create_node( |
|
201
|
NodeLabel.Import, |
|
202
|
{ |
|
203
|
"name": module, |
|
204
|
"file_path": file_path, |
|
205
|
"line_start": node.start_point[0] + 1, |
|
206
|
"module": module, |
|
207
|
}, |
|
208
|
) |
|
209
|
store.create_edge( |
|
210
|
NodeLabel.File, |
|
211
|
{"path": file_path}, |
|
212
|
EdgeType.IMPORTS, |
|
213
|
NodeLabel.Import, |
|
214
|
{"name": module, "file_path": file_path}, |
|
215
|
) |
|
216
|
stats["edges"] += 1 |
|
217
|
|
|
218
|
def _extract_calls( |
|
219
|
self, |
|
220
|
fn_node, |
|
221
|
source: bytes, |
|
222
|
file_path: str, |
|
223
|
fn_name: str, |
|
224
|
fn_label: str, |
|
225
|
store: GraphStore, |
|
226
|
stats: dict, |
|
227
|
) -> None: |
|
228
|
def walk(node): |
|
229
|
if node.type == "call_expression": |
|
230
|
func = node.child_by_field_name("function") |
|
231
|
if func: |
|
232
|
text = _node_text(func, source) |
|
233
|
# Handle Foo::bar() and obj.method() |
|
234
|
callee = text.replace("::", ".").split(".")[-1] |
|
235
|
store.create_edge( |
|
236
|
fn_label, |
|
237
|
{"name": fn_name, "file_path": file_path}, |
|
238
|
EdgeType.CALLS, |
|
239
|
NodeLabel.Function, |
|
240
|
{"name": callee, "file_path": file_path}, |
|
241
|
) |
|
242
|
stats["edges"] += 1 |
|
243
|
for child in node.children: |
|
244
|
walk(child) |
|
245
|
|
|
246
|
body = fn_node.child_by_field_name("body") |
|
247
|
if body: |
|
248
|
walk(body) |
|
249
|
|