From: Lady <redacted>
Date: Sun, 27 Apr 2025 04:31:53 +0000 (-0400)
Subject: Support attributes
X-Git-Tag: 0.5.0~4
X-Git-Url: https://git.ladys.computer/LesML/commitdiff_plain/9d9f801071766e03c98ca919461855ff97ff5795

Support attributes

This required a reworking of the link parsing code to enable it to also
be used for attribute parsing (more‐or‐less), and maybe also fixed a
bug where, if there was an end token with no start token, no further
end tokens would be processed (even later ones they did have start
tokens).
---

diff --git a/README.markdown b/README.markdown
index 327f253..11c8c37 100644
--- a/README.markdown
+++ b/README.markdown
@@ -193,6 +193,16 @@ Markup within paragraphs is delimited with·out exception by pairs of
     (consisting of `U+034F COMBINING GRAPHEME JOINER` for X·M·L
     compatibility).
 
+- The characters `{@` and `"}` indicate attribute specifications.
+  The attribute specification must contain at least one `="` which
+    separates the key of the attribute from the value.
+  Attributes attach to the previous element or text node, with
+    white·space‐only text nodes after elements ignored; if there is no
+    such previous element or text node, an empty text node is used
+    instead.
+  Multiple attributes can be given in sequence.
+  Text nodes with attributes are wrapped in `<html:span>`.
+
 - The characters `{🔗` and `>}` indicate a hyperlink to a U·R·L
     (`<html:a>`).
   The hyperlink must contain at least one `<`; the content before the
@@ -251,7 +261,9 @@ Finally, any character can be escaped by instead providing its Unicode
   codepoint in the form `{U+NNNN}`, where `NNNN` is one or more
   hexadecimal digits.
 Multiple codepoints may be provided separated by periods, as in
-  `{U+WWWW.ZZZZ}`
+  `{U+WWWW.ZZZZ}`.
+Due to limitations in X·S·L·T, characters cannot be escaped in
+  attributes (including link targets).
 
 ## Usage
 
diff --git a/parser.xslt b/parser.xslt
index 7e6f6a3..f6b3823 100644
--- a/parser.xslt
+++ b/parser.xslt
@@ -12,6 +12,7 @@ This Source Code Form is subject to the terms of the Mozilla Public License, v 2
 If a copy of the M·P·L was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
 -->
 <!DOCTYPE transform [
+	<!ENTITY LesML "urn:fdc:ladys.computer:20240512:LesML">
 	<!ENTITY section-break "*-.=_~·․‥…⁂⋯─━┄┅┈┉╌╍═╴╶╸╺☙❧　・＊－．＝＿～">
 	<!ENTITY sigiled-text "(string-length($text)=1 or substring($text, 2, 1)=' ')">
 	<!ENTITY unsigiled-text "substring($text, 3, string-length($text)-2)">
@@ -21,12 +22,13 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 	xmlns="http://www.w3.org/1999/XSL/Transform"
 	xmlns:LesML="urn:fdc:ladys.computer:20240512:LesML"
 	xmlns:exsl="http://exslt.org/common"
+	xmlns:exsldyn="http://exslt.org/dynamic"
 	xmlns:exslset="http://exslt.org/sets"
 	xmlns:exslstr="http://exslt.org/strings"
 	xmlns:html="http://www.w3.org/1999/xhtml"
 	xmlns:书社="urn:fdc:ladys.computer:20231231:Shu1She4"
 	exclude-result-prefixes="LesML"
-	extension-element-prefixes="exsl exslstr"
+	extension-element-prefixes="exsl exsldyn exslset exslstr"
 	version="1.0"
 >
 	<书社:id>urn:fdc:ladys.computer:20240512:LesML:parser.xslt</书社:id>
@@ -645,6 +647,28 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 			</call-template>
 		</element>
 	</template>
+	<template match="node()" mode="LesML:finalize-attributes">
+		<variable name="notattr" select="following-sibling::node()[not(self::text() and translate(., ' &#x9;', '')='' or self::LesML:attribute)]"/>
+		<for-each select="(.|exslset:leading(following-sibling::node(), $notattr)[self::LesML:attribute])/@*">
+			<copy-of select="."/>
+			<if test="local-name()='lang' and namespace-uri()=''">
+				<attribute name="xml:lang">
+					<value-of select="."/>
+				</attribute>
+			</if>
+		</for-each>
+	</template>
+	<template match="LesML:attribute[preceding-sibling::node()[position()=1 and (self::text() or self::*)]]|text()[preceding-sibling::node()[position()=1 and self::*] and following-sibling::node()[position()=1 and self::LesML:attribute] and translate(., ' &#x9;', '')='']" mode="LesML:finalize-tree" priority="2"/>
+	<template match="LesML:attribute|text()[following-sibling::node()[position()=1 and self::LesML:attribute]]" mode="LesML:finalize-tree" priority="1">
+		<element name="span" namespace="&xhtml;">
+			<apply-templates select="." mode="LesML:finalize-attributes"/>
+			<if test="self::text()">
+				<call-template name="LesML:break-and-unescape">
+					<with-param name="source" select="string(.)"/>
+				</call-template>
+			</if>
+		</element>
+	</template>
 	<template match="html:blockquote" mode="LesML:finalize-tree">
 		<if test="not(preceding-sibling::node()) or preceding-sibling::node()[position()=1 and not(self::html:blockquote)]">
 			<variable name="notquote" select="following-sibling::node()[not(self::html:blockquote)][1]"/>
@@ -737,8 +761,8 @@ 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-Link-Escape']" mode="LesML:finalize-tree">
-		<text>🔗</text>
+	<template match="processing-instruction()[local-name()='LesML-Token-Escape']" mode="LesML:finalize-tree">
+		<value-of select="."/>
 	</template>
 	<template match="text()" mode="LesML:finalize-tree">
 		<call-template name="LesML:break-and-unescape">
@@ -747,7 +771,8 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 	</template>
 	<template match="@*|node()" mode="LesML:finalize-tree" priority="-1">
 		<copy>
-			<apply-templates select="@*|node()" mode="LesML:finalize-tree"/>
+			<apply-templates select="." mode="LesML:finalize-attributes"/>
+			<apply-templates select="node()" mode="LesML:finalize-tree"/>
 		</copy>
 	</template>
 	<template match="node()" mode="LesML:comment">
@@ -841,7 +866,7 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 				</otherwise>
 			</choose>
 		</variable>
-		<apply-templates select="exsl:node-set($result)/node()" mode="LesML:linkify"/>
+		<apply-templates select="exsl:node-set($result)/node()" mode="LesML:attrify"/>
 	</template>
 	<template match="node()" mode="LesML:inline">
 		<param name="element-name"/>
@@ -954,110 +979,261 @@ If a copy of the M·P·L was not distributed with this file, You can obtain one
 			</otherwise>
 		</choose>
 	</template>
-	<template match="node()" mode="LesML:linkify">
+	<template match="*" mode="LesML:partition">
+		<param name="start-sigil"/>
+		<param name="end-sigil"/>
+		<param name="separator"/>
+		<param name="ncname-keys" select="false()"/>
+		<variable name="end-node" select="text()[contains(., $end-sigil)][1]"/>
+		<variable name="has-start-node" select="$end-node/preceding-sibling::text()[contains(., $start-sigil) and not(following-sibling::* or following-sibling::comment())] or string-length(substring-after($end-node, $start-sigil))>string-length(substring-after($end-node, $end-sigil))"/>
+		<choose>
+			<when test="$end-node and $has-start-node">
+				<variable name="preceding">
+					<copy-of select="$end-node/preceding-sibling::node()"/>
+					<value-of select="substring-before($end-node, $end-sigil)"/>
+				</variable>
+				<variable name="start-node" select="exsl:node-set($preceding)/text()[contains(., $start-sigil) and not(following-sibling::*)][last()]"/>
+				<variable name="start-tokens-fragment">
+					<call-template name="LesML:split">
+						<with-param name="source" select="string($start-node)"/>
+						<with-param name="separator" select="$start-sigil"/>
+					</call-template>
+				</variable>
+				<variable name="start-tokens" select="exsl:node-set($start-tokens-fragment)/*"/>
+				<variable name="innards">
+					<value-of select="$start-tokens[last()]"/>
+					<for-each select="$start-node/following-sibling::node()">
+						<value-of select="."/>
+					</for-each>
+				</variable>
+				<choose>
+					<when test="contains($innards, $separator)">
+						<variable name="keyval-fragment">
+							<call-template name="LesML:split">
+								<with-param name="source" select="$innards"/>
+								<with-param name="separator" select="$separator"/>
+							</call-template>
+						</variable>
+						<variable name="keyval" select="exsl:node-set($keyval-fragment)/*"/>
+						<variable name="key">
+							<choose>
+								<when test="$ncname-keys">
+									<value-of select="$keyval[1]"/>
+								</when>
+								<otherwise>
+									<for-each select="$keyval[position()!=last()]">
+										<value-of select="."/>
+										<if test="position()!=last()">
+											<value-of select="$separator"/>
+										</if>
+									</for-each>
+								</otherwise>
+							</choose>
+						</variable>
+						<variable name="value">
+							<choose>
+								<when test="$ncname-keys">
+									<for-each select="$keyval[position()!=1]">
+										<value-of select="."/>
+										<if test="position()!=last()">
+											<value-of select="$separator"/>
+										</if>
+									</for-each>
+								</when>
+								<otherwise>
+									<value-of select="$keyval[last()]"/>
+								</otherwise>
+							</choose>
+						</variable>
+						<choose>
+							<when test="not($ncname-keys) or /self::node()[translate(normalize-space($key), ' /([,*', '')=string($key) and exsldyn:evaluate(concat('not(self::html:', $key, ')'))]">
+								<element name="span" namespace="&xhtml;">
+									<copy-of select="$start-node/preceding-sibling::node()"/>
+									<for-each select="$start-tokens[position()!=last()]">
+										<value-of select="."/>
+										<if test="position()!=last()">
+											<value-of select="$start-sigil"/>
+										</if>
+									</for-each>
+								</element>
+								<element name="span" namespace="&xhtml;">
+									<value-of select="$key"/>
+								</element>
+								<element name="span" namespace="&xhtml;">
+									<value-of select="$value"/>
+								</element>
+								<element name="span" namespace="&xhtml;">
+									<value-of select="substring-after($end-node, $end-sigil)"/>
+									<copy-of select="$end-node/following-sibling::node()"/>
+								</element>
+							</when>
+							<otherwise>
+								<element name="span" namespace="&xhtml;">
+									<copy-of select="$start-node/preceding-sibling::node()"/>
+									<for-each select="$start-tokens[position()!=last()]">
+										<value-of select="."/>
+										<if test="position()!=last()">
+											<value-of select="$start-sigil"/>
+										</if>
+									</for-each>
+									<processing-instruction name="LesML-Token-Escape">
+										<value-of select="$start-sigil"/>
+									</processing-instruction>
+									<value-of select="$start-tokens[last()]"/>
+									<value-of select="$start-node/following-sibling::node()"/>
+									<value-of select="$end-sigil"/>
+									<value-of select="substring-after($end-node, $end-sigil)"/>
+									<copy-of select="$end-node/following-sibling::node()"/>
+								</element>
+							</otherwise>
+						</choose>
+					</when>
+					<otherwise>
+						<element name="span" namespace="&xhtml;">
+							<copy-of select="$start-node/preceding-sibling::node()"/>
+							<for-each select="$start-tokens[position()!=last()]">
+								<value-of select="."/>
+								<if test="position()!=last()">
+									<value-of select="$start-sigil"/>
+								</if>
+							</for-each>
+							<processing-instruction name="LesML-Token-Escape">
+								<value-of select="$start-sigil"/>
+							</processing-instruction>
+							<value-of select="$start-tokens[last()]"/>
+							<value-of select="$start-node/following-sibling::node()"/>
+							<value-of select="$end-sigil"/>
+							<value-of select="substring-after($end-node, $end-sigil)"/>
+							<copy-of select="$end-node/following-sibling::node()"/>
+						</element>
+					</otherwise>
+				</choose>
+			</when>
+			<when test="$end-node">
+				<element name="span" namespace="&xhtml;">
+					<copy-of select="$end-node/preceding-sibling::node()"/>
+					<value-of select="substring-before($end-node, $end-sigil)"/>
+					<processing-instruction name="LesML-Token-Escape">
+						<value-of select="$end-sigil"/>
+					</processing-instruction>
+					<value-of select="substring-after($end-node, $end-sigil)"/>
+					<copy-of select="$end-node/following-sibling::node()"/>
+				</element>
+			</when>
+			<otherwise>
+				<processing-instruction name="LesML-All-Done"/>
+			</otherwise>
+		</choose>
+	</template>
+	<template match="node()" mode="LesML:attrify">
 		<variable name="result">
 			<choose>
 				<when test="self::*">
-					<variable name="end-node" select="text()[contains(., '>}')][1]"/>
-					<variable name="has-start-node" select="$end-node/preceding-sibling::text()[contains(., '{🔗') and not(following-sibling::*)] or string-length(substring-after($end-node, '{🔗'))>string-length(substring-after($end-node, '>}'))"/>
+					<variable name="partitioned-fragment">
+						<apply-templates mode="LesML:partition" select=".">
+							<with-param name="start-sigil" select="'{@'"/>
+							<with-param name="end-sigil" select="'&quot;}'"/>
+							<with-param name="separator" select="'=&quot;'"/>
+							<with-param name="ncname-keys" select="true()"/>
+						</apply-templates>
+					</variable>
+					<variable name="partitioned" select="exsl:node-set($partitioned-fragment)/node()"/>
 					<choose>
-						<when test="$end-node and $has-start-node">
-							<variable name="preceding">
-								<copy-of select="$end-node/preceding-sibling::node()"/>
-								<value-of select="substring-before($end-node, '>}')"/>
+						<when test="count($partitioned)>1">
+							<variable name="processed">
+								<copy>
+									<copy-of select="@*"/>
+									<copy-of select="$partitioned[1]/node()"/>
+									<element name="LesML:attribute" namespace="&LesML;">
+										<attribute name="{$partitioned[2]}">
+											<value-of select="$partitioned[3]"/>
+										</attribute>
+									</element>
+									<copy-of select="$partitioned[4]/node()"/>
+								</copy>
 							</variable>
-							<variable name="start-node" select="exsl:node-set($preceding)/text()[contains(., '{🔗') and not(following-sibling::*)][last()]"/>
-							<variable name="start-tokens-fragment">
-								<call-template name="LesML:split">
-									<with-param name="source" select="string($start-node)"/>
-									<with-param name="separator" select="'{🔗'"/>
-								</call-template>
+							<apply-templates select="exsl:node-set($processed)/node()" mode="LesML:attrify"/>
+						</when>
+						<when test="$partitioned[self::processing-instruction() and local-name()='LesML-All-Done']">
+							<copy>
+								<copy-of select="@*"/>
+								<apply-templates select="node()" mode="LesML:attrify"/>
+							</copy>
+						</when>
+						<otherwise>
+							<variable name="processed">
+								<copy>
+									<copy-of select="@*"/>
+									<copy-of select="$partitioned/node()"/>
+								</copy>
 							</variable>
-							<variable name="start-tokens" select="exsl:node-set($start-tokens-fragment)/*"/>
-							<variable name="hyperlink">
-								<value-of select="$start-tokens[last()]"/>
-								<for-each select="$start-node/following-sibling::node()">
-									<choose>
-										<when test="self::text()">
-											<value-of select="."/>
-										</when>
-										<when test="self::processing-instruction()[local-name()='LesML-Link-Escape']">
-											<text>🔗</text>
-										</when>
-									</choose>
-								</for-each>
+							<apply-templates select="exsl:node-set($processed)/node()" mode="LesML:attrify"/>
+						</otherwise>
+					</choose>
+				</when>
+				<otherwise>
+					<copy-of select="."/>
+				</otherwise>
+			</choose>
+		</variable>
+		<apply-templates select="exsl:node-set($result)/node()" mode="LesML:linkify"/>
+	</template>
+	<template match="node()" mode="LesML:linkify">
+		<variable name="result">
+			<choose>
+				<when test="processing-instruction()[local-name()='LesML-All-Done']">
+					<copy>
+						<copy-of select="@*|node()[not(self::processing-instruction() and local-name()='LesML-All-Done')]"/>
+					</copy>
+				</when>
+				<when test="self::*">
+					<variable name="partitioned-fragment">
+						<apply-templates mode="LesML:partition" select=".">
+							<with-param name="start-sigil" select="'{🔗'"/>
+							<with-param name="end-sigil" select="'>}'"/>
+							<with-param name="separator" select="'&lt;'"/>
+						</apply-templates>
+					</variable>
+					<variable name="partitioned" select="exsl:node-set($partitioned-fragment)/node()"/>
+					<choose>
+						<when test="count($partitioned)>1">
+							<variable name="processed">
+								<copy>
+									<copy-of select="@*"/>
+									<copy-of select="$partitioned[1]/node()"/>
+									<element name="a" namespace="&xhtml;">
+										<attribute name="href">
+											<value-of select="$partitioned[3]"/>
+										</attribute>
+										<processing-instruction name="LesML-All-Done"/>
+										<choose>
+											<when test="string($partitioned[2])=''">
+												<value-of select="$partitioned[3]"/>
+											</when>
+											<otherwise>
+												<value-of select="$partitioned[2]"/>
+											</otherwise>
+										</choose>
+									</element>
+									<copy-of select="$partitioned[4]/node()"/>
+								</copy>
 							</variable>
-							<choose>
-								<when test="contains($hyperlink, '&lt;')">
-									<variable name="ltcomponents-fragment">
-										<call-template name="LesML:split">
-											<with-param name="source" select="$hyperlink"/>
-											<with-param name="separator" select="'&lt;'"/>
-										</call-template>
-									</variable>
-									<variable name="ltcomponents" select="exsl:node-set($ltcomponents-fragment)/*"/>
-									<variable name="wrapped">
-										<copy>
-											<copy-of select="@*"/>
-											<copy-of select="$start-node/preceding-sibling::node()"/>
-											<for-each select="$start-tokens[position()!=last()]">
-												<value-of select="."/>
-												<if test="position()!=last()">
-													<text>{🔗</text>
-												</if>
-											</for-each>
-											<element name="a" namespace="&xhtml;">
-												<attribute name="href">
-													<value-of select="$ltcomponents[last()]"/>
-												</attribute>
-												<choose>
-													<when test="count($ltcomponents)>2 or normalize-space($ltcomponents[1])!=''">
-														<for-each select="$ltcomponents[position()!=last()]">
-															<value-of select="."/>
-															<if test="position()!=last()">
-																<text>&lt;</text>
-															</if>
-														</for-each>
-													</when>
-													<otherwise>
-														<value-of select="$ltcomponents[last()]"/>
-													</otherwise>
-												</choose>
-											</element>
-											<value-of select="substring-after($end-node, '>}')"/>
-											<copy-of select="$end-node/following-sibling::node()"/>
-										</copy>
-									</variable>
-									<apply-templates select="exsl:node-set($wrapped)/*" mode="LesML:linkify"/>
-								</when>
-								<otherwise>
-									<variable name="escaped">
-										<copy>
-											<copy-of select="@*"/>
-											<copy-of select="$start-node/preceding-sibling::node()"/>
-											<for-each select="$start-tokens[position()!=last()]">
-												<value-of select="."/>
-												<if test="position()!=last()">
-													<text>{🔗</text>
-												</if>
-											</for-each>
-											<text>{</text>
-											<processing-instruction name="LesML-Link-Escape"/>
-											<copy-of select="$hyperlink"/>
-											<text>>}</text>
-											<value-of select="substring-after($end-node, '>}')"/>
-											<copy-of select="$end-node/following-sibling::node()"/>
-										</copy>
-									</variable>
-									<apply-templates select="exsl:node-set($escaped)/*" mode="LesML:linkify"/>
-								</otherwise>
-							</choose>
+							<apply-templates select="exsl:node-set($processed)/node()" mode="LesML:linkify"/>
 						</when>
-						<otherwise>
+						<when test="$partitioned[self::processing-instruction() and local-name()='LesML-All-Done']">
 							<copy>
 								<copy-of select="@*"/>
 								<apply-templates select="node()" mode="LesML:linkify"/>
 							</copy>
+						</when>
+						<otherwise>
+							<variable name="processed">
+								<copy>
+									<copy-of select="@*"/>
+									<copy-of select="$partitioned/node()"/>
+								</copy>
+							</variable>
+							<apply-templates select="exsl:node-set($processed)/node()" mode="LesML:linkify"/>
 						</otherwise>
 					</choose>
 				</when>