Add column_layout: infer columns from whitespace (borderless tables)#377
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ocr/structure detects a table only when every row's cell-left-x matches, so it fails on ragged / borderless / right-aligned columns; edge_lines.find_grid needs ruling lines a whitespace table has none of. Find columns by the gaps: project OCR boxes onto the x-axis, read the persistent empty vertical bands as gutters, assign column indices, bucket rows by spacing, emit the table. Pure difference-array projection, no numpy.
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| Metric | Results |
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| Complexity | 58 |
| Duplication | 0 |
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摘要
新增
detect_borderless_table/column_gutters/assign_columns/vertical_projection— 以垂直留白投影偵測無框線表格的欄位。ocr/structure只有在每一列儲存格左緣 x 都在容差內相符時才偵測得到表格,對 ragged / 無框線 / 右對齊數字欄、或缺格的列都會失敗;edge_lines.find_grid需要框線,純留白表格沒有網格。本功能用版面分析文獻常用的穩健方法——靠間隙:把 OCR 框投影到 x 軸(墨水密度剖面),讀出持續為空的垂直帶作為欄間隙(gutter),為每個框指派欄索引,依垂直間距分群成列,輸出無框線表格。純標準函式庫差分陣列投影(不需 numpy);重用
table_grid_fill的框邊界讀取器。Qt-free。五層
utils/column_layout/—vertical_projection、column_gutters、assign_columns、detect_borderless_table。je_auto_control匯出 +__all__。AC_detect_borderless_table({found, table})/AC_column_gutters({count, gutters})。ac_detect_borderless_table/ac_column_gutters(read-only)。測試
test/unit_test/headless/test_column_layout_batch.py— 投影含零值 gutter、gutter 偵測、欄位指派、端到端 2 欄 3 列表格、單欄非表格回 None、空回 None、wiring + facade。8 passed。ruff / bandit / radon / float-scan / Qt-free 全乾淨。