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1
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""" |
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2
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Go AST parser — extracts functions, methods, struct/interface types, |
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3
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imports, and call edges from .go files using tree-sitter. |
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""" |
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6
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import logging |
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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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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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logger = logging.getLogger(__name__) |
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14
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15
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def _get_go_language(): |
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try: |
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import tree_sitter_go as tsgo # type: ignore[import] |
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from tree_sitter import Language |
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return Language(tsgo.language()) |
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22
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except ImportError as e: |
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raise ImportError("Install tree-sitter-go: pip install tree-sitter-go") from e |
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24
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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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29
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class GoParser(LanguageParser): |
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"""Parses Go source files into the navegador graph.""" |
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32
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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_go_language()) |
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37
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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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42
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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": "go", |
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"line_count": source.count(b"\n"), |
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}, |
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) |
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52
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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) |
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return stats |
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# ── AST walker ──────────────────────────────────────────────────────────── |
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59
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def _walk(self, node, source: bytes, file_path: str, store: GraphStore, stats: dict) -> None: |
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if node.type == "function_declaration": |
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self._handle_function(node, source, file_path, store, stats, receiver=None) |
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return |
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if node.type == "method_declaration": |
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self._handle_method(node, source, file_path, store, stats) |
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return |
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if node.type == "type_declaration": |
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self._handle_type(node, source, file_path, store, stats) |
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return |
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if node.type == "import_declaration": |
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self._handle_import(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) |
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# ── Handlers ────────────────────────────────────────────────────────────── |
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def _handle_function( |
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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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receiver: str | None, |
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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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return |
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name = _node_text(name_node, source) |
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label = NodeLabel.Method if receiver 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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"class_name": receiver or "", |
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}, |
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) |
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103
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104
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container_label = NodeLabel.Class if receiver else NodeLabel.File |
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container_key = ( |
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{"name": receiver, "file_path": file_path} if receiver 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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stats["functions"] += 1 |
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116
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stats["edges"] += 1 |
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117
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118
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self._extract_calls(node, source, file_path, name, label, store, stats) |
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119
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120
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def _handle_method( |
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121
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
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122
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) -> None: |
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123
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receiver_type = "" |
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124
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recv_node = node.child_by_field_name("receiver") |
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125
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if recv_node: |
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126
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for child in recv_node.children: |
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127
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if child.type == "parameter_declaration": |
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128
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for c in child.children: |
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129
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if c.type in ("type_identifier", "pointer_type"): |
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receiver_type = _node_text(c, source).lstrip("*").strip() |
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break |
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132
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self._handle_function(node, source, file_path, store, stats, receiver=receiver_type or None) |
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133
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134
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def _handle_type( |
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135
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
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136
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) -> None: |
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137
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for child in node.children: |
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138
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if child.type != "type_spec": |
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139
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continue |
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140
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name_node = child.child_by_field_name("name") |
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141
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type_node = child.child_by_field_name("type") |
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142
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if not name_node or not type_node: |
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143
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continue |
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144
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if type_node.type not in ("struct_type", "interface_type"): |
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145
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continue |
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146
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name = _node_text(name_node, source) |
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147
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kind = "struct" if type_node.type == "struct_type" else "interface" |
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148
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store.create_node( |
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NodeLabel.Class, |
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150
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{ |
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"name": name, |
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152
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"file_path": file_path, |
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153
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"line_start": node.start_point[0] + 1, |
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154
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"line_end": node.end_point[0] + 1, |
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155
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"docstring": kind, |
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156
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}, |
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157
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) |
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158
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store.create_edge( |
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159
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NodeLabel.File, |
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160
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{"path": file_path}, |
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161
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EdgeType.CONTAINS, |
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162
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NodeLabel.Class, |
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163
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{"name": name, "file_path": file_path}, |
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164
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) |
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165
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stats["classes"] += 1 |
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166
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stats["edges"] += 1 |
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167
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|
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168
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def _handle_import( |
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169
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self, node, source: bytes, file_path: str, store: GraphStore, stats: dict |
|
170
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) -> None: |
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171
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line_start = node.start_point[0] + 1 |
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172
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for child in node.children: |
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173
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if child.type == "import_spec": |
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174
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self._ingest_import_spec(child, source, file_path, line_start, store, stats) |
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175
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elif child.type == "import_spec_list": |
|
176
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for spec in child.children: |
|
177
|
if spec.type == "import_spec": |
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178
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self._ingest_import_spec(spec, source, file_path, line_start, store, stats) |
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179
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|
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180
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def _ingest_import_spec( |
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181
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self, spec, source: bytes, file_path: str, line_start: int, store: GraphStore, stats: dict |
|
182
|
) -> None: |
|
183
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path_node = spec.child_by_field_name("path") |
|
184
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if not path_node: |
|
185
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return |
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186
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module = _node_text(path_node, source).strip('"') |
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187
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store.create_node( |
|
188
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NodeLabel.Import, |
|
189
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{ |
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190
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"name": module, |
|
191
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"file_path": file_path, |
|
192
|
"line_start": line_start, |
|
193
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"module": module, |
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194
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}, |
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195
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) |
|
196
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store.create_edge( |
|
197
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NodeLabel.File, |
|
198
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{"path": file_path}, |
|
199
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EdgeType.IMPORTS, |
|
200
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NodeLabel.Import, |
|
201
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{"name": module, "file_path": file_path}, |
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202
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) |
|
203
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stats["edges"] += 1 |
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204
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|
|
205
|
def _extract_calls( |
|
206
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self, |
|
207
|
fn_node, |
|
208
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source: bytes, |
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209
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file_path: str, |
|
210
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fn_name: str, |
|
211
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fn_label: str, |
|
212
|
store: GraphStore, |
|
213
|
stats: dict, |
|
214
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) -> None: |
|
215
|
def walk(node): |
|
216
|
if node.type == "call_expression": |
|
217
|
func = node.child_by_field_name("function") |
|
218
|
if func: |
|
219
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callee = _node_text(func, source).split(".")[-1] |
|
220
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store.create_edge( |
|
221
|
fn_label, |
|
222
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{"name": fn_name, "file_path": file_path}, |
|
223
|
EdgeType.CALLS, |
|
224
|
NodeLabel.Function, |
|
225
|
{"name": callee, "file_path": file_path}, |
|
226
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) |
|
227
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stats["edges"] += 1 |
|
228
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for child in node.children: |
|
229
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walk(child) |
|
230
|
|
|
231
|
body = fn_node.child_by_field_name("body") |
|
232
|
if body: |
|
233
|
walk(body) |
|
234
|
|