chore: import upstream snapshot with attribution

graphify/extractors/elixir.py

@@ -0,0 +1,228 @@
+"""Elixir extractor. Moved verbatim from graphify/extract.py."""
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from graphify.extractors.base import _LANGUAGE_BUILTIN_GLOBALS, _file_stem, _make_id
+
+
+def extract_elixir(path: Path) -> dict:
+    """Extract modules, functions, imports, and calls from a .ex/.exs file."""
+    try:
+        import tree_sitter_elixir as tselixir
+        from tree_sitter import Language, Parser
+    except ImportError:
+        return {"nodes": [], "edges": [], "error": "tree_sitter_elixir not installed"}
+
+    try:
+        language = Language(tselixir.language())
+        parser = Parser(language)
+        source = path.read_bytes()
+        tree = parser.parse(source)
+        root = tree.root_node
+    except Exception as e:
+        return {"nodes": [], "edges": [], "error": str(e)}
+
+    stem = _file_stem(path)
+    str_path = str(path)
+    nodes: list[dict] = []
+    edges: list[dict] = []
+    seen_ids: set[str] = set()
+    function_bodies: list[tuple[str, Any]] = []
+
+    def add_node(nid: str, label: str, line: int) -> None:
+        if nid not in seen_ids:
+            seen_ids.add(nid)
+            nodes.append({"id": nid, "label": label, "file_type": "code",
+                          "source_file": str_path, "source_location": f"L{line}"})
+
+    def add_edge(src: str, tgt: str, relation: str, line: int,
+                 confidence: str = "EXTRACTED", weight: float = 1.0,
+                 context: str | None = None) -> None:
+        edge = {"source": src, "target": tgt, "relation": relation,
+                "confidence": confidence, "source_file": str_path,
+                "source_location": f"L{line}", "weight": weight}
+        if context:
+            edge["context"] = context
+        edges.append(edge)
+
+    file_nid = _make_id(str(path))
+    add_node(file_nid, path.name, 1)
+
+    _IMPORT_KEYWORDS = frozenset({"alias", "import", "require", "use"})
+
+    def _get_alias_text(node) -> str | None:
+        for child in node.children:
+            if child.type == "alias":
+                return source[child.start_byte:child.end_byte].decode("utf-8", errors="replace")
+        return None
+
+    def _get_alias_modules(node) -> list[str]:
+        """Every module named by an alias/import/require/use argument.
+
+        Handles the single form (``alias Foo.Bar`` -> ``["Foo.Bar"]``) and the
+        multi-alias brace form (``alias Foo.{Bar, Baz}`` ->
+        ``["Foo.Bar", "Foo.Baz"]``), which the grammar represents as a ``dot``
+        node holding the base alias and a trailing ``tuple`` of member aliases.
+        """
+        def _text(n) -> str:
+            return source[n.start_byte:n.end_byte].decode("utf-8", errors="replace")
+
+        for child in node.children:
+            if child.type == "alias":
+                return [_text(child)]
+            if child.type == "dot":
+                base = None
+                tuple_node = None
+                for sub in child.children:
+                    if sub.type == "alias" and base is None:
+                        base = _text(sub)
+                    elif sub.type == "tuple":
+                        tuple_node = sub
+                if base and tuple_node is not None:
+                    members = [_text(m) for m in tuple_node.children if m.type == "alias"]
+                    if members:
+                        return [f"{base}.{m}" for m in members]
+                return [_text(child)]
+        return []
+
+    def walk(node, parent_module_nid: str | None = None) -> None:
+        if node.type != "call":
+            for child in node.children:
+                walk(child, parent_module_nid)
+            return
+
+        identifier_node = None
+        arguments_node = None
+        do_block_node = None
+        for child in node.children:
+            if child.type == "identifier":
+                identifier_node = child
+            elif child.type == "arguments":
+                arguments_node = child
+            elif child.type == "do_block":
+                do_block_node = child
+
+        if identifier_node is None:
+            for child in node.children:
+                walk(child, parent_module_nid)
+            return
+
+        keyword = source[identifier_node.start_byte:identifier_node.end_byte].decode("utf-8", errors="replace")
+        line = node.start_point[0] + 1
+
+        if keyword == "defmodule":
+            module_name = _get_alias_text(arguments_node) if arguments_node else None
+            if not module_name:
+                return
+            module_nid = _make_id(stem, module_name)
+            add_node(module_nid, module_name, line)
+            add_edge(file_nid, module_nid, "contains", line)
+            if do_block_node:
+                for child in do_block_node.children:
+                    walk(child, parent_module_nid=module_nid)
+            return
+
+        if keyword in ("def", "defp"):
+            func_name = None
+            if arguments_node:
+                for child in arguments_node.children:
+                    if child.type == "call":
+                        for sub in child.children:
+                            if sub.type == "identifier":
+                                func_name = source[sub.start_byte:sub.end_byte].decode("utf-8", errors="replace")
+                                break
+                    elif child.type == "identifier":
+                        func_name = source[child.start_byte:child.end_byte].decode("utf-8", errors="replace")
+                        break
+            if not func_name:
+                return
+            container = parent_module_nid or file_nid
+            func_nid = _make_id(container, func_name)
+            add_node(func_nid, f"{func_name}()", line)
+            if parent_module_nid:
+                add_edge(parent_module_nid, func_nid, "method", line)
+            else:
+                add_edge(file_nid, func_nid, "contains", line)
+            if do_block_node:
+                function_bodies.append((func_nid, do_block_node))
+            return
+
+        if keyword in _IMPORT_KEYWORDS and arguments_node:
+            for module_name in _get_alias_modules(arguments_node):
+                tgt_nid = _make_id(module_name)
+                add_edge(file_nid, tgt_nid, "imports", line, context="import")
+            return
+
+        for child in node.children:
+            walk(child, parent_module_nid)
+
+    walk(root)
+
+    label_to_nid: dict[str, str] = {}
+    for n in nodes:
+        normalised = n["label"].strip("()").lstrip(".")
+        label_to_nid[normalised] = n["id"]
+
+    seen_call_pairs: set[tuple[str, str]] = set()
+    raw_calls: list[dict] = []
+    _SKIP_KEYWORDS = frozenset({
+        "def", "defp", "defmodule", "defmacro", "defmacrop",
+        "defstruct", "defprotocol", "defimpl", "defguard",
+        "alias", "import", "require", "use",
+        "if", "unless", "case", "cond", "with", "for",
+    })
+
+    def walk_calls(node, caller_nid: str) -> None:
+        if node.type != "call":
+            for child in node.children:
+                walk_calls(child, caller_nid)
+            return
+        for child in node.children:
+            if child.type == "identifier":
+                kw = source[child.start_byte:child.end_byte].decode("utf-8", errors="replace")
+                if kw in _SKIP_KEYWORDS:
+                    for c in node.children:
+                        walk_calls(c, caller_nid)
+                    return
+                break
+        callee_name: str | None = None
+        is_member_call: bool = False
+        for child in node.children:
+            if child.type == "dot":
+                is_member_call = True
+                dot_text = source[child.start_byte:child.end_byte].decode("utf-8", errors="replace")
+                parts = dot_text.rstrip(".").split(".")
+                if parts:
+                    callee_name = parts[-1]
+                break
+            if child.type == "identifier":
+                callee_name = source[child.start_byte:child.end_byte].decode("utf-8", errors="replace")
+                break
+        if callee_name and callee_name not in _LANGUAGE_BUILTIN_GLOBALS:
+            tgt_nid = label_to_nid.get(callee_name)
+            if tgt_nid and tgt_nid != caller_nid:
+                pair = (caller_nid, tgt_nid)
+                if pair not in seen_call_pairs:
+                    seen_call_pairs.add(pair)
+                    add_edge(caller_nid, tgt_nid, "calls",
+                             node.start_point[0] + 1, confidence="EXTRACTED", weight=1.0,
+                             context="call")
+            else:
+                raw_calls.append({
+                    "caller_nid": caller_nid,
+                    "callee": callee_name,
+                    "is_member_call": is_member_call,
+                    "source_file": str_path,
+                    "source_location": f"L{node.start_point[0] + 1}",
+                })
+        for child in node.children:
+            walk_calls(child, caller_nid)
+
+    for caller_nid, body in function_bodies:
+        walk_calls(body, caller_nid)
+
+    clean_edges = [e for e in edges if e["source"] in seen_ids and
+                   (e["target"] in seen_ids or e["relation"] == "imports")]
+    return {"nodes": nodes, "edges": clean_edges, "raw_calls": raw_calls, "input_tokens": 0, "output_tokens": 0}