From: Lady <redacted>
Date: Mon, 28 Apr 2025 01:55:06 +0000 (-0400)
Subject: Support hgroups with heading continuations
X-Git-Tag: 0.5.0^0
X-Git-Url: https://git.ladys.computer/LesML/commitdiff_plain/refs/heads/current?hp=1192f5c276e839eaf6b7bbad5d31b0175a3e52ed

Support hgroups with heading continuations

These are a bit interesting because continuation paragraphs can be
placed _before_ the heading they “continue” (not just after). A block
comment can be used to separate them from a preceding list or similar.
---

diff --git a/README.markdown b/README.markdown
index 1643af2..ac2d0dc 100644
--- a/README.markdown
+++ b/README.markdown
@@ -173,10 +173,12 @@ After this classification, each ordinary paragraph is further
   Comments produce X·M·L comment nodes and can be used to break up list
     items into separate lists.
 
-- If the paragraph begins with `⋯`, it is a continuation paragraph
-    (`<html:div class="continuation">`).
+- If the paragraph begins with `⋯`, it is a continuation paragraph.
   Continuation paragraphs may be used to continue a preceding div or
     list item.
+  If there is no such preceding div or list item, they will attach to
+    adjacent heading elements to form heading groups (`<html:hgroup>`).
+  Otherwise, they will be treated as ordinary paragraphs.
 
 - Otherwise, it is an ordinary paragraph.
 
diff --git a/parser.xslt b/parser.xslt
index 99ee743..5ba2248 100644
--- a/parser.xslt
+++ b/parser.xslt
@@ -705,9 +705,7 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 						</when>
 						<when test="starts-with($text, '⋯') and &sigiled-text;">
 							<element name="div" namespace="&xhtml;">
-								<attribute name="class">
-									<text>continuation</text>
-								</attribute>
+								<processing-instruction name="LesML-Continuation"/>
 								<element name="p" namespace="&xhtml;">
 									<call-template name="LesML:id-and-contents">
 										<with-param name="source" select="&unsigiled-text;"/>
@@ -783,18 +781,60 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 		</element>
 	</template>
 	<template match="html:div" mode="LesML:finalize-tree">
-		<if test="not(@class='continuation') or not(preceding-sibling::node()) or preceding-sibling::node()[position()=1 and not(self::html:div or self::html:li)]">
-			<variable name="notcontinuation" select="following-sibling::node()[not(self::html:div and @class='continuation')][1]"/>
-			<copy>
-				<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
-				<for-each select="exslset:leading(following-sibling::node(), $notcontinuation)">
+		<if test="not(processing-instruction()[local-name()='LesML-Continuation']) or not(preceding-sibling::node()[position()=1 and self::html:* and contains(' div li h1 h2 h3 h4 h5 h6 ', local-name())])">
+			<variable name="notcontinuation" select="following-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][1]"/>
+			<choose>
+				<when test="processing-instruction()[local-name()='LesML-Continuation'] and $notcontinuation[self::html:* and contains(' h1 h2 h3 h4 h5 h6 ', local-name())]">
+					<variable name="notcontinuation2" select="$notcontinuation/following-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][1]"/>
+					<element name="hgroup" namespace="&xhtml;">
+						<apply-templates select="node()" mode="LesML:finalize-tree"/>
+						<for-each select="exslset:leading(following-sibling::node(), $notcontinuation2)">
+							<choose>
+								<when test="self::html:div">
+									<apply-templates select="node()" mode="LesML:finalize-tree"/>
+								</when>
+								<otherwise>
+									<copy>
+										<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
+									</copy>
+								</otherwise>
+							</choose>
+						</for-each>
+					</element>
+				</when>
+				<otherwise>
 					<apply-templates select="node()" mode="LesML:finalize-tree"/>
-				</for-each>
-			</copy>
+					<for-each select="exslset:leading(following-sibling::node(), $notcontinuation)">
+						<apply-templates select="node()" mode="LesML:finalize-tree"/>
+					</for-each>
+				</otherwise>
+			</choose>
+		</if>
+	</template>
+	<template match="html:h1|html:h2|html:h3|html:h4|html:h5|html:h6" mode="LesML:finalize-tree">
+		<if test="not(preceding-sibling::node()[position()=1 and self::html:div/processing-instruction()[local-name()='LesML-Continuation']]) or preceding-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][position()=1 and self::html:* and contains(' h1 h2 h3 h4 h5 h6 ', local-name())]">
+			<choose>
+				<when test="following-sibling::node()[position()=1 and self::html:div]/processing-instruction()[local-name()='LesML-Continuation']">
+					<variable name="notcontinuation" select="following-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][1]"/>
+					<element name="hgroup" namespace="&xhtml;">
+						<copy>
+							<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
+						</copy>
+						<for-each select="exslset:leading(following-sibling::node(), $notcontinuation)">
+							<apply-templates select="node()" mode="LesML:finalize-tree"/>
+						</for-each>
+					</element>
+				</when>
+				<otherwise>
+					<copy>
+						<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
+					</copy>
+				</otherwise>
+			</choose>
 		</if>
 	</template>
 	<template match="html:li" mode="LesML:finalize-tree">
-		<if test="not(preceding-sibling::node()) or preceding-sibling::node()[not(preceding-sibling::* and self::html:div and @class='continuation')][position()=1 and not(self::html:li)]">
+		<if test="not(preceding-sibling::node()) or preceding-sibling::node()[not(preceding-sibling::* and self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][position()=1 and not(self::html:li)]">
 			<apply-templates select="." mode="LesML:finalize-list"/>
 		</if>
 	</template>
@@ -812,10 +852,10 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 				</otherwise>
 			</choose>
 		</variable>
-		<variable name="notinlist" select="following-sibling::node()[not(self::html:div and @class='continuation' or self::html:li and (@data-level>$current-level or @data-level=$current-level and @class=$current-class))][1]"/>
+		<variable name="notinlist" select="following-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'] or self::html:li and (@data-level>$current-level or @data-level=$current-level and @class=$current-class))][1]"/>
 		<element name="{$wrapper}" namespace="&xhtml;">
 			<for-each select=".|exslset:leading(following-sibling::node(), $notinlist)[self::html:li and @data-level=$current-level]">
-				<variable name="notcontinuation" select="following-sibling::node()[not(self::html:div and @class='continuation')][1]"/>
+				<variable name="notcontinuation" select="following-sibling::node()[not(self::html:div/processing-instruction()[local-name()='LesML-Continuation'])][1]"/>
 				<copy>
 					<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
 					<for-each select="exslset:leading(following-sibling::node(), $notcontinuation)">
@@ -835,6 +875,7 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 			</apply-templates>
 		</if>
 	</template>
+	<template match="processing-instruction()[local-name()='LesML-Continuation']" mode="LesML:finalize-tree"/>
 	<template match="processing-instruction()[local-name()='LesML-Token-Escape']" mode="LesML:finalize-tree">
 		<value-of select="."/>
 	</template>