PaddleX/paddlex/inference/pipelines/layout_parsing/result_v2.py

# Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
#
# 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.
from __future__ import annotations

import copy
import re
from pathlib import Path
from typing import List

import numpy as np
from PIL import Image, ImageDraw

from ...common.result import (
    BaseCVResult,
    HtmlMixin,
    JsonMixin,
    MarkdownMixin,
    XlsxMixin,
)


class LayoutParsingResultV2(BaseCVResult, HtmlMixin, XlsxMixin, MarkdownMixin):
    """Layout Parsing Result V2"""

    def __init__(self, data) -> None:
        """Initializes a new instance of the class with the specified data."""
        super().__init__(data)
        HtmlMixin.__init__(self)
        XlsxMixin.__init__(self)
        MarkdownMixin.__init__(self)
        JsonMixin.__init__(self)
        self.title_pattern = self._build_title_pattern()

    def _build_title_pattern(self):
        # Precompiled regex pattern for matching numbering at the beginning of the title
        numbering_pattern = (
            r"(?:"
            + r"[1-9][0-9]*(?:\.[1-9][0-9]*)*[\.、]?|"
            + r"[\(\（](?:[1-9][0-9]*|["
            r"一二三四五六七八九十百千万亿零壹贰叁肆伍陆柒捌玖拾]+)[\)\）]|" + r"["
            r"一二三四五六七八九十百千万亿零壹贰叁肆伍陆柒捌玖拾]+"
            r"[、\.]?|" + r"(?:I|II|III|IV|V|VI|VII|VIII|IX|X)\.?" + r")"
        )
        return re.compile(r"^\s*(" + numbering_pattern + r")(\s*)(.*)$")

    def _get_input_fn(self):
        fn = super()._get_input_fn()
        if (page_idx := self["page_index"]) is not None:
            fp = Path(fn)
            stem, suffix = fp.stem, fp.suffix
            return f"{stem}_{page_idx}{suffix}"
        else:
            return fn

    def _to_img(self) -> dict[str, np.ndarray]:
        from .utils import get_show_color

        res_img_dict = {}
        model_settings = self["model_settings"]
        if model_settings["use_doc_preprocessor"]:
            for key, value in self["doc_preprocessor_res"].img.items():
                res_img_dict[key] = value
        res_img_dict["layout_det_res"] = self["layout_det_res"].img["res"]

        if model_settings["use_general_ocr"] or model_settings["use_table_recognition"]:
            res_img_dict["overall_ocr_res"] = self["overall_ocr_res"].img["ocr_res_img"]

        if model_settings["use_table_recognition"] and len(self["table_res_list"]) > 0:
            table_cell_img = Image.fromarray(
                copy.deepcopy(self["doc_preprocessor_res"]["output_img"])
            )
            table_draw = ImageDraw.Draw(table_cell_img)
            rectangle_color = (255, 0, 0)
            for sno in range(len(self["table_res_list"])):
                table_res = self["table_res_list"][sno]
                cell_box_list = table_res["cell_box_list"]
                for box in cell_box_list:
                    x1, y1, x2, y2 = [int(pos) for pos in box]
                    table_draw.rectangle(
                        [x1, y1, x2, y2], outline=rectangle_color, width=2
                    )
            res_img_dict["table_cell_img"] = table_cell_img

        if model_settings["use_seal_recognition"] and len(self["seal_res_list"]) > 0:
            for sno in range(len(self["seal_res_list"])):
                seal_res = self["seal_res_list"][sno]
                seal_region_id = seal_res["seal_region_id"]
                sub_seal_res_dict = seal_res.img
                key = f"seal_res_region{seal_region_id}"
                res_img_dict[key] = sub_seal_res_dict["ocr_res_img"]

        # for layout ordering image
        image = Image.fromarray(self["doc_preprocessor_res"]["output_img"][:, :, ::-1])
        draw = ImageDraw.Draw(image, "RGBA")
        parsing_result: List[LayoutParsingBlock] = self["parsing_res_list"]
        for block in parsing_result:
            bbox = block.bbox
            index = block.index
            label = block.label
            fill_color = get_show_color(label)
            draw.rectangle(bbox, fill=fill_color)
            if index is not None:
                text_position = (bbox[2] + 2, bbox[1] - 10)
                draw.text(text_position, str(index), fill="red")

        res_img_dict["layout_order_res"] = image

        return res_img_dict

    def _to_str(self, *args, **kwargs) -> dict[str, str]:
        """Converts the instance's attributes to a dictionary and then to a string.

        Args:
            *args: Additional positional arguments passed to the base class method.
            **kwargs: Additional keyword arguments passed to the base class method.

        Returns:
            Dict[str, str]: A dictionary with the instance's attributes converted to strings.
        """
        data = {}
        data["input_path"] = self["input_path"]
        data["page_index"] = self["page_index"]
        model_settings = self["model_settings"]
        data["model_settings"] = model_settings
        if self["model_settings"]["use_doc_preprocessor"]:
            data["doc_preprocessor_res"] = self["doc_preprocessor_res"].str["res"]
        data["layout_det_res"] = self["layout_det_res"].str["res"]
        if model_settings["use_general_ocr"] or model_settings["use_table_recognition"]:
            data["overall_ocr_res"] = self["overall_ocr_res"].str["res"]
        if model_settings["use_table_recognition"] and len(self["table_res_list"]) > 0:
            data["table_res_list"] = []
            for sno in range(len(self["table_res_list"])):
                table_res = self["table_res_list"][sno]
                data["table_res_list"].append(table_res.str["res"])
        if model_settings["use_seal_recognition"] and len(self["seal_res_list"]) > 0:
            data["seal_res_list"] = []
            for sno in range(len(self["seal_res_list"])):
                seal_res = self["seal_res_list"][sno]
                data["seal_res_list"].append(seal_res.str["res"])
        if (
            model_settings["use_formula_recognition"]
            and len(self["formula_res_list"]) > 0
        ):
            data["formula_res_list"] = []
            for sno in range(len(self["formula_res_list"])):
                formula_res = self["formula_res_list"][sno]
                data["formula_res_list"].append(formula_res.str["res"])

        return JsonMixin._to_str(data, *args, **kwargs)

    def _to_json(self, *args, **kwargs) -> dict[str, str]:
        """
        Converts the object's data to a JSON dictionary.

        Args:
            *args: Positional arguments passed to the JsonMixin._to_json method.
            **kwargs: Keyword arguments passed to the JsonMixin._to_json method.

        Returns:
            Dict[str, str]: A dictionary containing the object's data in JSON format.
        """
        data = {}
        data["input_path"] = self["input_path"]
        data["page_index"] = self["page_index"]
        model_settings = self["model_settings"]
        data["model_settings"] = model_settings
        parsing_res_list = self["parsing_res_list"]
        parsing_res_list = [
            {
                "block_label": parsing_res.label,
                "block_content": parsing_res.content,
                "block_bbox": parsing_res.bbox,
            }
            for parsing_res in parsing_res_list
        ]
        data["parsing_res_list"] = parsing_res_list
        if self["model_settings"]["use_doc_preprocessor"]:
            data["doc_preprocessor_res"] = self["doc_preprocessor_res"].json["res"]
        data["layout_det_res"] = self["layout_det_res"].json["res"]
        if model_settings["use_general_ocr"] or model_settings["use_table_recognition"]:
            data["overall_ocr_res"] = self["overall_ocr_res"].json["res"]
        if model_settings["use_table_recognition"] and len(self["table_res_list"]) > 0:
            data["table_res_list"] = []
            for sno in range(len(self["table_res_list"])):
                table_res = self["table_res_list"][sno]
                data["table_res_list"].append(table_res.json["res"])
        if model_settings["use_seal_recognition"] and len(self["seal_res_list"]) > 0:
            data["seal_res_list"] = []
            for sno in range(len(self["seal_res_list"])):
                seal_res = self["seal_res_list"][sno]
                data["seal_res_list"].append(seal_res.json["res"])
        if (
            model_settings["use_formula_recognition"]
            and len(self["formula_res_list"]) > 0
        ):
            data["formula_res_list"] = []
            for sno in range(len(self["formula_res_list"])):
                formula_res = self["formula_res_list"][sno]
                data["formula_res_list"].append(formula_res.json["res"])
        return JsonMixin._to_json(data, *args, **kwargs)

    def _to_html(self) -> dict[str, str]:
        """Converts the prediction to its corresponding HTML representation.

        Returns:
            Dict[str, str]: The str type HTML representation result.
        """
        model_settings = self["model_settings"]
        res_html_dict = {}
        if model_settings["use_table_recognition"] and len(self["table_res_list"]) > 0:
            for sno in range(len(self["table_res_list"])):
                table_res = self["table_res_list"][sno]
                table_region_id = table_res["table_region_id"]
                key = f"table_{table_region_id}"
                res_html_dict[key] = table_res.html["pred"]
        return res_html_dict

    def _to_xlsx(self) -> dict[str, str]:
        """Converts the prediction HTML to an XLSX file path.

        Returns:
            Dict[str, str]: The str type XLSX representation result.
        """
        model_settings = self["model_settings"]
        res_xlsx_dict = {}
        if model_settings["use_table_recognition"] and len(self["table_res_list"]) > 0:
            for sno in range(len(self["table_res_list"])):
                table_res = self["table_res_list"][sno]
                table_region_id = table_res["table_region_id"]
                key = f"table_{table_region_id}"
                res_xlsx_dict[key] = table_res.xlsx["pred"]
        return res_xlsx_dict

    def _to_markdown(self) -> dict:
        """
        Save the parsing result to a Markdown file.

        Returns:
            Dict
        """

        def _format_data(obj):

            def format_title(title):
                """
                Normalize chapter title.
                Add the '#' to indicate the level of the title.
                If numbering exists, ensure there's exactly one space between it and the title content.
                If numbering does not exist, return the original title unchanged.

                :param title: Original chapter title string.
                :return: Normalized chapter title string.
                """
                match = self.title_pattern.match(title)
                if match:
                    numbering = match.group(1).strip()
                    title_content = match.group(3).lstrip()
                    # Return numbering and title content separated by one space
                    title = numbering + " " + title_content

                title = title.rstrip(".")
                level = (
                    title.count(
                        ".",
                    )
                    + 1
                    if "." in title
                    else 1
                )
                return f"#{'#' * level} {title}".replace("-\n", "").replace(
                    "\n",
                    " ",
                )

            def format_centered_text():
                return (
                    f'<div style="text-align: center;">{block.content}</div>'.replace(
                        "-\n",
                        "",
                    ).replace("\n", " ")
                    + "\n"
                )

            def format_image():
                img_tags = []
                image_path = "".join(block.image.keys())
                img_tags.append(
                    '<div style="text-align: center;"><img src="{}" alt="Image" /></div>'.format(
                        image_path.replace("-\n", "").replace("\n", " "),
                    ),
                )
                return "\n".join(img_tags)

            def format_first_line(templates, format_func, spliter):
                lines = block.content.split(spliter)
                for idx in range(len(lines)):
                    line = lines[idx]
                    if line.strip() == "":
                        continue
                    if line.lower() in templates:
                        lines[idx] = format_func(line)
                    break
                return spliter.join(lines)

            def format_table():
                return "\n" + block.content

            def get_seg_flag(block: LayoutParsingBlock, prev_block: LayoutParsingBlock):

                seg_start_flag = True
                seg_end_flag = True

                block_box = block.bbox
                context_left_coordinate = block_box[0]
                context_right_coordinate = block_box[2]
                seg_start_coordinate = block.seg_start_coordinate
                seg_end_coordinate = block.seg_end_coordinate

                if prev_block is not None:
                    prev_block_bbox = prev_block.bbox
                    num_of_prev_lines = prev_block.num_of_lines
                    pre_block_seg_end_coordinate = prev_block.seg_end_coordinate
                    prev_end_space_small = (
                        context_right_coordinate - pre_block_seg_end_coordinate < 10
                    )
                    prev_lines_more_than_one = num_of_prev_lines > 1

                    overlap_blocks = context_left_coordinate < prev_block_bbox[2]

                    # update context_left_coordinate and context_right_coordinate
                    if overlap_blocks:
                        context_left_coordinate = min(
                            prev_block_bbox[0], context_left_coordinate
                        )
                        context_right_coordinate = max(
                            prev_block_bbox[2], context_right_coordinate
                        )
                        prev_end_space_small = (
                            prev_block_bbox[2] - pre_block_seg_end_coordinate < 10
                        )

                    current_start_space_small = (
                        seg_start_coordinate - context_left_coordinate < 10
                    )

                    if (
                        prev_end_space_small
                        and current_start_space_small
                        and prev_lines_more_than_one
                    ):
                        seg_start_flag = False
                else:
                    if seg_start_coordinate - context_left_coordinate < 10:
                        seg_start_flag = False

                if context_right_coordinate - seg_end_coordinate < 10:
                    seg_end_flag = False

                return seg_start_flag, seg_end_flag

            handlers = {
                "paragraph_title": lambda: format_title(block.content),
                "doc_title": lambda: f"# {block.content}".replace(
                    "-\n",
                    "",
                ).replace("\n", " "),
                "table_title": lambda: format_centered_text(),
                "figure_title": lambda: format_centered_text(),
                "chart_title": lambda: format_centered_text(),
                "text": lambda: block.content.replace("-\n", " ").replace("\n", " "),
                "abstract": lambda: format_first_line(
                    ["摘要", "abstract"], lambda l: f"## {l}\n", " "
                ),
                "content": lambda: block.content.replace("-\n", "  \n").replace(
                    "\n", "  \n"
                ),
                "image": lambda: format_image(),
                "chart": lambda: format_image(),
                "formula": lambda: f"$${block.content}$$",
                "table": format_table,
                "reference": lambda: format_first_line(
                    ["参考文献", "references"], lambda l: f"## {l}", "\n"
                ),
                "algorithm": lambda: block.content.strip("\n"),
                "seal": lambda: f"Words of Seals:\n{block.content}",
            }
            parsing_res_list = obj["parsing_res_list"]
            markdown_content = ""
            last_label = None
            seg_start_flag = None
            seg_end_flag = None
            prev_block = None
            page_first_element_seg_start_flag = None
            page_last_element_seg_end_flag = None
            for block in parsing_res_list:
                seg_start_flag, seg_end_flag = get_seg_flag(block, prev_block)

                label = block.label
                page_first_element_seg_start_flag = (
                    seg_start_flag
                    if (page_first_element_seg_start_flag is None)
                    else page_first_element_seg_start_flag
                )
                handler = handlers.get(label)
                if handler:
                    prev_block = block
                    if label == last_label == "text" and seg_start_flag == False:
                        last_char_of_markdown = (
                            markdown_content[-1] if markdown_content else ""
                        )
                        first_char_of_handler = handler()[0] if handler() else ""
                        last_is_chinese_char = (
                            re.match(r"[\u4e00-\u9fff]", last_char_of_markdown)
                            if last_char_of_markdown
                            else False
                        )
                        first_is_chinese_char = (
                            re.match(r"[\u4e00-\u9fff]", first_char_of_handler)
                            if first_char_of_handler
                            else False
                        )
                        if not (last_is_chinese_char or first_is_chinese_char):
                            markdown_content += " " + handler()
                        else:
                            markdown_content += handler()
                    else:
                        markdown_content += (
                            "\n\n" + handler() if markdown_content else handler()
                        )
                    last_label = label
            page_last_element_seg_end_flag = seg_end_flag

            return markdown_content, (
                page_first_element_seg_start_flag,
                page_last_element_seg_end_flag,
            )

        markdown_info = dict()
        markdown_info["markdown_texts"], (
            page_first_element_seg_start_flag,
            page_last_element_seg_end_flag,
        ) = _format_data(self)
        markdown_info["page_continuation_flags"] = (
            page_first_element_seg_start_flag,
            page_last_element_seg_end_flag,
        )

        markdown_info["markdown_images"] = {}
        for img in self["imgs_in_doc"]:
            markdown_info["markdown_images"][img["path"]] = img["img"]

        return markdown_info


class LayoutParsingBlock:

    def __init__(self, label, bbox, content="") -> None:
        self.label = label
        self.region_label = "other"
        self.bbox = [int(item) for item in bbox]
        self.content = content
        self.seg_start_coordinate = float("inf")
        self.seg_end_coordinate = float("-inf")
        self.width = bbox[2] - bbox[0]
        self.height = bbox[3] - bbox[1]
        self.area = self.width * self.height
        self.num_of_lines = 1
        self.image = None
        self.index = None
        self.visual_index = None
        self.direction = self.get_bbox_direction()
        self.child_blocks = []
        self.update_direction_info()

    def __str__(self) -> str:
        return f"{self.__dict__}"

    def __repr__(self) -> str:
        _str = f"\n\n#################\nlabel:\t{self.label}\nregion_label:\t{self.region_label}\nbbox:\t{self.bbox}\ncontent:\t{self.content}\n#################"
        return _str

    def to_dict(self) -> dict:
        return self.__dict__

    def update_direction_info(self) -> None:
        if self.region_label == "vision":
            self.direction = "horizontal"
        if self.direction == "horizontal":
            self.secondary_direction = "vertical"
            self.short_side_length = self.height
            self.long_side_length = self.width
            self.start_coordinate = self.bbox[0]
            self.end_coordinate = self.bbox[2]
            self.secondary_direction_start_coordinate = self.bbox[1]
            self.secondary_direction_end_coordinate = self.bbox[3]
        else:
            self.secondary_direction = "horizontal"
            self.short_side_length = self.width
            self.long_side_length = self.height
            self.start_coordinate = self.bbox[1]
            self.end_coordinate = self.bbox[3]
            self.secondary_direction_start_coordinate = self.bbox[0]
            self.secondary_direction_end_coordinate = self.bbox[2]

    def append_child_block(self, child_block: LayoutParsingBlock) -> None:
        if not self.child_blocks:
            self.ori_bbox = self.bbox.copy()
        x1, y1, x2, y2 = self.bbox
        x1_child, y1_child, x2_child, y2_child = child_block.bbox
        union_bbox = (
            min(x1, x1_child),
            min(y1, y1_child),
            max(x2, x2_child),
            max(y2, y2_child),
        )
        self.bbox = union_bbox
        self.update_direction_info()
        child_blocks = [child_block]
        if child_block.child_blocks:
            child_blocks.extend(child_block.get_child_blocks())
        self.child_blocks.extend(child_blocks)

    def get_child_blocks(self) -> list:
        self.bbox = self.ori_bbox
        child_blocks = self.child_blocks.copy()
        self.child_blocks = []
        return child_blocks

    def get_centroid(self) -> tuple:
        x1, y1, x2, y2 = self.bbox
        centroid = ((x1 + x2) / 2, (y1 + y2) / 2)
        return centroid

    def get_bbox_direction(self, orientation_ratio: float = 1.0) -> bool:
        """
        Determine if a bounding box is horizontal or vertical.

        Args:
            bbox (List[float]): Bounding box [x_min, y_min, x_max, y_max].
            orientation_ratio (float): Ratio for determining orientation. Default is 1.0.

        Returns:
            str: "horizontal" or "vertical".
        """
        return (
            "horizontal"
            if self.width * orientation_ratio >= self.height
            else "vertical"
        )