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class DropReason:
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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
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USEFUL_BLOCK_HOR_OVERLAP = (
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'useful_block_horizontal_overlap' # 需保留的block水平覆盖
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)
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COMPLICATED_LAYOUT = 'complicated_layout' # 复杂的布局，暂时不支持
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TOO_MANY_LAYOUT_COLUMNS = 'too_many_layout_columns' # 目前不支持分栏超过2列的
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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。
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HIGH_COMPUTATIONAL_lOAD_BY_IMGS = (
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'high_computational_load_by_imgs' # 含特殊图片，计算量太大，从而丢弃
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)
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HIGH_COMPUTATIONAL_lOAD_BY_SVGS = (
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'high_computational_load_by_svgs' # 特殊的SVG图，计算量太大，从而丢弃
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)
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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
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MISS_DOC_LAYOUT_RESULT = 'missing doc_layout_result' # 版面分析失败
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Exception = '_exception' # 解析中发生异常
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ENCRYPTED = 'encrypted' # PDF是加密的
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EMPTY_PDF = 'total_page=0' # PDF页面总数为0
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NOT_IS_TEXT_PDF = 'not_is_text_pdf' # 不是文字版PDF，无法直接解析
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DENSE_SINGLE_LINE_BLOCK = 'dense_single_line_block' # 无法清晰的分段
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TITLE_DETECTION_FAILED = 'title_detection_failed' # 探测标题失败
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TITLE_LEVEL_FAILED = (
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'title_level_failed' # 分析标题级别失败（例如一级、二级、三级标题）
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)
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PARA_SPLIT_FAILED = 'para_split_failed' # 识别段落失败
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PARA_MERGE_FAILED = 'para_merge_failed' # 段落合并失败
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NOT_ALLOW_LANGUAGE = 'not_allow_language' # 不支持的语种
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SPECIAL_PDF = 'special_pdf'
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PSEUDO_SINGLE_COLUMN = 'pseudo_single_column' # 无法精确判断文字分栏
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CAN_NOT_DETECT_PAGE_LAYOUT = 'can_not_detect_page_layout' # 无法分析页面的版面
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NEGATIVE_BBOX_AREA = 'negative_bbox_area' # 缩放导致 bbox 面积为负
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OVERLAP_BLOCKS_CAN_NOT_SEPARATION = (
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'overlap_blocks_can_t_separation' # 无法分离重叠的block
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)
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