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class DropReason:
TEXT_BLCOK_HOR_OVERLAP = "text_block_horizontal_overlap" # 文字块有水平互相覆盖，导致无法准确定位文字顺序
USEFUL_BLOCK_HOR_OVERLAP = "useful_block_horizontal_overlap" # 需保留的block水平覆盖
COMPLICATED_LAYOUT = "complicated_layout" # 复杂的布局，暂时不支持
TOO_MANY_LAYOUT_COLUMNS = "too_many_layout_columns" # 目前不支持分栏超过2列的
COLOR_BACKGROUND_TEXT_BOX = "color_background_text_box" # 含有带色块的PDF，色块会改变阅读顺序，目前不支持带底色文字块的PDF。
HIGH_COMPUTATIONAL_lOAD_BY_IMGS = "high_computational_load_by_imgs" # 含特殊图片，计算量太大，从而丢弃
HIGH_COMPUTATIONAL_lOAD_BY_SVGS = "high_computational_load_by_svgs" # 特殊的SVG图，计算量太大，从而丢弃
HIGH_COMPUTATIONAL_lOAD_BY_TOTAL_PAGES = "high_computational_load_by_total_pages" # 计算量超过负荷，当前方法下计算量消耗过大
MISS_DOC_LAYOUT_RESULT = "missing doc_layout_result" # 版面分析失败
Exception = "_exception" # 解析中发生异常
ENCRYPTED = "encrypted" # PDF是加密的
EMPTY_PDF = "total_page=0" # PDF页面总数为0
NOT_IS_TEXT_PDF = "not_is_text_pdf" # 不是文字版PDF，无法直接解析
DENSE_SINGLE_LINE_BLOCK = "dense_single_line_block" # 无法清晰的分段
TITLE_DETECTION_FAILED = "title_detection_failed" # 探测标题失败
TITLE_LEVEL_FAILED = "title_level_failed" # 分析标题级别失败（例如一级、二级、三级标题）
PARA_SPLIT_FAILED = "para_split_failed" # 识别段落失败
PARA_MERGE_FAILED = "para_merge_failed" # 段落合并失败
NOT_ALLOW_LANGUAGE = "not_allow_language" # 不支持的语种
SPECIAL_PDF = "special_pdf"
PSEUDO_SINGLE_COLUMN = "pseudo_single_column" # 无法精确判断文字分栏
CAN_NOT_DETECT_PAGE_LAYOUT="can_not_detect_page_layout" # 无法分析页面的版面
NEGATIVE_BBOX_AREA = "negative_bbox_area" # 缩放导致 bbox 面积为负
OVERLAP_BLOCKS_CAN_NOT_SEPARATION = "overlap_blocks_can_t_separation" # 无法分离重叠的block
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