Module parser/rules/block/table

Block rule for Wikidot pipe-syntax tables.

Wikidot tables are written using || delimiters at the start of a line:

|| Cell 1 || Cell 2 ||
|| Cell 3 || Cell 4 ||
Copy

Cell variants:

• || -- normal cell (<td>)
• ||~ -- header cell (<th>)
• ||< -- left-aligned cell
• ||> -- right-aligned cell (TABLE_RIGHT)
• ||= -- center-aligned cell

Colspan is achieved by using multiple consecutive || before content: |||| = colspan 2, |||||| = colspan 3, etc.

Key Wikidot behaviour:

• Cells MUST be terminated by another || (or variant). Unterminated cells (reaching end of line without a closing ||) are discarded.
• If all cells in a row are unterminated, one empty cell is kept.
• Content within cells supports inline markup (bold, links, etc.).
• Leading and trailing whitespace in cell content is trimmed.

The table element carries _source: "pipe" in its attributes to distinguish it from block-syntax tables ([[table]]).