Remove file_exists parameter from mypy.parse.parse() calls

Author: bzoracler

misc/dump-ast.py

@@ -19,7 +19,7 @@ def dump(fname: str, python_version: tuple[int, int], quiet: bool = False) -> No
     options.python_version = python_version
     with open(fname, "rb") as f:
         s = f.read()
-        tree = parse(s, fname, None, errors=Errors(options), options=options, file_exists=True)
+        tree = parse(s, fname, None, errors=Errors(options), options=options)
         if not quiet:
             print(tree)
 

mypy/build.py

@@ -1282,13 +1282,12 @@ def parse_file(
 
         Raise CompileError if there is a parse error.
         """
-        file_exists = self.fscache.exists(path, real_only=True)
         t0 = time.time()
         if raw_data:
             # If possible, deserialize from known binary data instead of parsing from scratch.
             tree = load_from_raw(path, id, raw_data, self.errors, options)
         else:
-            tree = parse(source, path, id, self.errors, options=options, file_exists=file_exists)
+            tree = parse(source, path, id, self.errors, options=options)
         tree._fullname = id
         if self.stats_enabled:
             with self.stats_lock:

mypy/checkstrformat.py

@@ -587,7 +587,6 @@ def apply_field_accessors(
             module=None,
             options=self.chk.options,
             errors=temp_errors,
-            file_exists=False,
             eager=True,
         )
         if temp_errors.is_errors():

mypy/parse.py

@@ -17,7 +17,6 @@ def parse(
     module: str | None,
     errors: Errors,
     options: Options,
-    file_exists: bool,
     eager: bool = False,
 ) -> MypyFile:
     """Parse a source file, without doing any semantic analysis.
@@ -29,25 +28,21 @@ def parse(
     the parse errors, use eager=True.
     """
     if options.native_parser:
-        # Native parser only works with actual files on disk
-        # Fall back to fastparse for in-memory source or non-existent files
-        if file_exists:
-            import mypy.nativeparse
-
-            ignore_errors = options.ignore_errors or fnam in errors.ignored_files
-            # If errors are ignored, we can drop many function bodies to speed up type checking.
-            strip_function_bodies = ignore_errors and not options.preserve_asts
-            tree, _, _ = mypy.nativeparse.native_parse(
-                fnam, options, skip_function_bodies=strip_function_bodies
-            )
-            # Set is_stub based on file extension
-            tree.is_stub = fnam.endswith(".pyi")
-            # Note: tree.imports is populated directly by load_from_raw() with deserialized
-            # import metadata, so we don't need to collect imports via AST traversal
-            if eager and tree.raw_data is not None:
-                tree = load_from_raw(fnam, module, tree.raw_data, errors, options)
-            return tree
-        # Fall through to fastparse for non-existent files
+        import mypy.nativeparse
+
+        ignore_errors = options.ignore_errors or fnam in errors.ignored_files
+        # If errors are ignored, we can drop many function bodies to speed up type checking.
+        strip_function_bodies = ignore_errors and not options.preserve_asts
+        tree, _, _ = mypy.nativeparse.native_parse(
+            fnam, options, source, skip_function_bodies=strip_function_bodies
+        )
+        # Set is_stub based on file extension
+        tree.is_stub = fnam.endswith(".pyi")
+        # Note: tree.imports is populated directly by load_from_raw() with deserialized
+        # import metadata, so we don't need to collect imports via AST traversal
+        if eager and tree.raw_data is not None:
+            tree = load_from_raw(fnam, module, tree.raw_data, errors, options)
+        return tree
 
     if options.transform_source is not None:
         source = options.transform_source(source)

mypy/stubgen.py

@@ -1750,7 +1750,6 @@ def parse_source_file(mod: StubSource, mypy_options: MypyOptions) -> None:
         module=mod.module,
         errors=errors,
         options=mypy_options,
-        file_exists=True,
         eager=True,
     )
     mod.ast._fullname = mod.module

mypy/test/testparse.py

@@ -66,7 +66,6 @@ def test_parser(testcase: DataDrivenTestCase) -> None:
             module="__main__",
             errors=errors,
             options=options,
-            file_exists=False,
             eager=True,
         )
         if errors.is_errors():
@@ -108,7 +107,6 @@ def test_parse_error(testcase: DataDrivenTestCase) -> None:
             "__main__",
             errors=errors,
             options=options,
-            file_exists=False,
             eager=True,
         )
         if errors.is_errors():