feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/knowledge/entity/strategy.go

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2025 coze-dev 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 entity
+
+import (
+	"github.com/coze-dev/coze-studio/backend/api/model/crossdomain/knowledge"
+	"github.com/coze-dev/coze-studio/backend/infra/contract/document/parser"
+)
+
+type RetrievalStrategy = knowledge.RetrievalStrategy
+
+// ParsingStrategy for document parse before indexing
+type ParsingStrategy struct {
+	ParsingType ParsingType `json:"parsing_type"` // 解析类型
+	// Doc
+	ExtractImage bool  `json:"extract_image"` // 提取图片元素
+	ExtractTable bool  `json:"extract_table"` // 提取表格元素
+	ImageOCR     bool  `json:"image_ocr"`     // 图片 ocr
+	FilterPages  []int `json:"filter_pages"`  // 过滤页数
+
+	// Sheet
+	SheetID       int64 `json:"sheet_id"`        // xlsx sheet id
+	HeaderLine    int   `json:"header_line"`     // 表头行
+	DataStartLine int   `json:"data_start_line"` // 数据起始行
+	RowsCount     int   `json:"rows_count"`      // 读取数据行数
+
+	// Image
+	CaptionType *parser.ImageAnnotationType `json:"caption_type"`
+}
+type ParsingType int64
+
+const (
+	ParsingType_FastParsing     ParsingType = 0
+	ParsingType_AccurateParsing ParsingType = 1
+)
+
+// ChunkingStrategy for document chunk before indexing
+type ChunkingStrategy struct {
+	ChunkType parser.ChunkType `json:"chunk_type"`
+	// custom chunk config
+	ChunkSize       int64  `json:"chunk_size"` // 分段最大长度
+	Separator       string `json:"separator"`  // 分段标识符
+	Overlap         int64  `json:"overlap"`    // 分段重叠
+	TrimSpace       bool   `json:"trim_space"`
+	TrimURLAndEmail bool   `json:"trim_url_and_email"`
+
+	// 按层级分段
+	MaxDepth  int64 `json:"max_depth"`  // 按层级分段时的最大层级
+	SaveTitle bool  `json:"save_title"` // 保留层级标题
+}