6.18 Horizontal writing (横組み)

Synopsis

A 横組み directive sets a run or a block of text horizontally inside an otherwise vertical document — used for Western dates, formulae, and tabular fragments ([AOZORA-ANNOTATION], etc.html). Two forms occur: an inline forward reference for a single run and a ここから/ここで block region.

Notation

horizontal-inline = target "［＃「" target "」は横組み］"
horizontal-open   = LBRACK HASH %s"ここから横組み" RBRACK
horizontal-close  = LBRACK HASH %s"ここで横組み終わり" RBRACK

西暦［＃「西暦」は横組み］

［＃ここから横組み］
2024年1月
［＃ここで横組み終わり］

Parameters

target — for the inline form, the single quoted run to set horizontally (resolved by the look-back rule, §7.5).

Semantics

The inline forward-reference form yields an emphasis node over its target and is an inline construct.
The block form pairs opener and closer by the horizontal family (§7.1) and yields a block container node governing the enclosed paragraphs; it nests with other block containers (§7.3).
Reference rendering (§8) is <span class="aozora-yokogumi">…</span> for the inline form and <div class="aozora-container aozora-container-yokogumi">…</div> for the block form. Whether a processor reorients glyphs or merely tags the region is a presentation choice; the node model only records that the run is 横組み.
Serialization reconstructs the inline directive or the block opener/closer byte-exact (§7.6).

Error conditions

Target with no referent (inline) — the quoted target has no earlier run to reorient, so it is itself the 横組み run: a self-contained forward reference, rendered <span class="aozora-yokogumi">. Serialization reconstructs the directive byte-exact (§7.6).
Mismatched / unclosed block — handled per mismatched-container-close and unclosed-bracket.

Conformance vectors

horizontal_inline_forward, horizontal_container, horizontal_inline_forward_no_referent (under conformance/vectors/).

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