chore: import upstream snapshot with attribution

components/document/parser/interface.go

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 CloudWeGo Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package parser
+
+import (
+	"context"
+	"io"
+
+	"github.com/cloudwego/eino/schema"
+)
+
+// Parser converts raw content from an [io.Reader] into [schema.Document] values.
+//
+// Parse may return multiple documents from a single reader (e.g. a PDF with
+// per-page splitting). The reader is consumed during Parse and must not be
+// reused.
+//
+// Parsers are typically not called directly — they are configured on a
+// [document.Loader] and invoked via [document.WithParserOptions].
+type Parser interface {
+	Parse(ctx context.Context, reader io.Reader, opts ...Option) ([]*schema.Document, error)
+}