Add type stubs

Author: andreypopp

setup.py

@@ -29,6 +29,9 @@
         "Topic :: Software Development :: Compilers",
         "Topic :: Text Processing :: Linguistic",
     ],
+    package_data={
+        "tree_sitter": ["__init__.pyi"],
+    },
     packages=["tree_sitter"],
     ext_modules=[
         Extension(

tree_sitter/__init__.pyi

@@ -0,0 +1,58 @@
+from typing import Optional, List, Iterator
+
+
+class Language:
+    def __init__(self, path: str, name: str): ...
+
+    def field_id_for_name(self, name: str) -> int: ...
+    def query(self, source) -> Query: ...
+
+
+class Parser:
+    def set_language(self, lang: Language) -> None: ...
+    def parse(self, src: bytes) -> Tree: ...
+
+
+class Node:
+    type: str
+    is_named: bool
+    is_missing: bool
+    has_changes: bool
+    has_error: bool
+    start_byte: int
+    end_byte: int
+    start_point: Point
+    end_point: Point
+    children: List[Node]
+    child_count: int
+    named_child_count: int
+    next_sibling: Optional[Node]
+    prev_sibling: Optional[Node]
+    next_named_sibling: Optional[Node]
+    prev_named_sibling: Optional[Node]
+    parent: Optional[Node]
+
+    def walk(self) -> TreeCursor: ...
+    def sexp(self) -> str: ...
+    def child_by_field_id(self, id: int) -> Optional[Node]: ...
+    def child_by_field_name(self, name: str) -> Optional[Node]: ...
+    def children_by_field_id(self, id: int) -> Iterator[Node]: ...
+    def children_by_field_name(self, name: str) -> Iterator[Node]: ...
+
+
+class Tree:
+    root_node: Node
+    walk(self): TreeCursor
+
+
+class TreeCursor:
+    node: Node
+
+    def current_field_name(self) -> str: ...
+    def goto_parent(self) -> bool: ...
+    def goto_first_child(self) -> bool: ...
+    def goto_next_sibling(self) -> bool: ...
+
+
+class Query:
+    def captures(self, node: Node) -> List[Tuple[Node, str]]