DocBook: output inline equations in their own paragraph if they are the only inset...

It's invalid to have an <inlineequation> outside a paragraph. Another solution would have been to change InsetMathHull::docbook to generate an <informalequation>, but that function would have required more knowledge about its context than now.

Need more tests to determine if <inlineequation> should only be output for hullSimple or in more cases like:

		const static std::set<HullType> inlineHulls = {
				hullUnknown,
				hullNone,
				hullSimple,
				hullEquation,
				hullMultline,
				hullGather,
				hullRegexp
		};

diff --git a/autotests/export/docbook/doc_de_Math.lyx b/autotests/export/docbook/doc_de_Math.lyx
new file mode 100644 (file)
index 0000000..a0e9bf2
--- /dev/null
+++ b/autotests/export/docbook/doc_de_Math.lyx
@@ -0,0 +1,324 @@
+#LyX 2.4 created this file. For more info see https://www.lyx.org/
+\lyxformat 599
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass scrartcl
+\begin_preamble
+% DO NOT ALTER THIS PREAMBLE!!!
+%
+% This preamble is designed to ensure that the file prints
+% out as advertised. If you mess with this preamble,
+% parts of this document may not print out as expected.  If you
+% have problems LaTeXing this file, please contact 
+% the documentation team
+% email: lyx-docs@lists.lyx.org
+
+% Folgendes Problem lösen:
+% Besteht die Kapitelnummer aus zu vielen Ziffern, wird  die
+% Kapitelüberschrift im Inhaltsverzeichnis direkt an oder über
+% die Kapitelnummer geschrieben.
+% Als Lösung wird mehr Platz zwischen Nummer und
+% Überschrift eingefügt.
+\renewcommand{\l@subsection}{\@dottedtocline{2}{1.5em}{2.8em}}
+\renewcommand{\l@subsubsection}{\@dottedtocline{3}{4.3em}{3.6em}}
+
+% Linkfläche für Querverweise vergrößern und automatisch benennen,
+\AtBeginDocument{\renewcommand{\ref}[1]{\mbox{\autoref{#1}}}}
+\@ifpackageloaded{babel}{
+ \addto\extrasngerman{%
+  \renewcommand*{\equationautorefname}[1]{}%
+  \renewcommand{\sectionautorefname}{Kap.\negthinspace}%
+  \renewcommand{\subsectionautorefname}{Kap.\negthinspace}%
+  \renewcommand{\subsubsectionautorefname}{Kap.\negthinspace}%
+ }
+}{}
+
+% Makros damit Pakete nicht doppelt geladen werden.
+% siehe erste Fußnote in Kap. 9.3
+\@ifundefined{textcolor}{\usepackage{color}}{}
+
+% Die Seiten des Inhaltsverzeichnisses werden römisch numeriert,
+% ein PDF-Lesezeichen für das Inhaltsverzeichnis wird hinzugefügt
+\pagenumbering{roman}
+\let\myTOC\tableofcontents
+\renewcommand{\tableofcontents}{%
+ \vspace{1cm}
+ \pdfbookmark[1]{\contentsname}{}
+ \myTOC
+ \cleardoublepage
+ \pagenumbering{arabic}}
+
+% add 0.5 mm vertical space for table rows
+\@ifundefined{extrarowheight} {\usepackage{array}}{}
+\setlength{\extrarowheight}{0.5mm}
+
+% Damit die Fußnoten einen zusätzlichen vertikalen Abstand von 1,5 mm haben,
+\let\myFoot\footnote
+\renewcommand{\footnote}[1]{\myFoot{#1\vspace{1.5mm}}}
+
+% macht Beschriftungen fett
+\setkomafont{captionlabel}{\bfseries}
+
+% enables calculation of values
+\usepackage{calc}
+
+% für Mehrfachzeilen, benutzt in Kap. 24.7
+\usepackage{multicol}
+
+% benutzt in Kap. 19.4
+\usepackage{remreset}
+
+% für das Fourier-Transformationssymbol
+\usepackage{mathrsfs}
+
+% Farbdefinition aus Kap. 9.3
+\definecolor{dunkelgruen}{cmyk}{0.5, 0, 1, 0.5}
+
+% Operatoren deklarieren (siehe Kap. 10.4 und 15.2)
+\DeclareMathOperator*{\Raute}{\blacklozenge}
+\DeclareMathOperator{\sgn}{sgn}
+
+% Beispielbefehle aus Kap. 20.1 
+\newcommand{\gr}{\Longrightarrow}
+\newcommand{\us}[1]{\underline{#1}}
+\newcommand{\fb}[3]{\framebox#1#2{$#3$}}
+\newcommand{\cb}[3][white]{\fcolorbox{#2}{#1}{$#3$}}
+\newcommand{\fracS}[3][]{\genfrac{}{}{#1}{}{#2}{#3}}
+
+% Beispielmakro aus Kap. 19.4
+%\AtBeginDocument{
+%\def\tagform@#1{\maketag@@@{|#1|}}
+%}
+
+\@ifpackageloaded{babel}{
+ % Damit der Index einen anderen Namen erhält.
+ \addto\captionsngerman
+ {\renewcommand{\indexname}
+ {Stichwort- und Befehlsverzeichnis}}
+}{}
+
+% ------------------------------------
+% used to check for needed LaTeX packages
+\usepackage{ifthen}
+
+% testen ob das Paket undertilde installiert ist
+% wird benutzt für den Befehl \utilde
+\newboolean{undertilde}
+\IfFileExists{undertilde.sty}
+ {\usepackage{undertilde}
+  \setboolean{undertilde}{true}}
+ {\setboolean{undertilde}{false}}
+
+% testen ob das Paket eurosym installiert ist
+% wird benutzt für das Euro-Symbol
+\newboolean{eurosym}
+\IfFileExists{eurosym.sty}
+ {\usepackage[gennarrow]{eurosym}
+  \setboolean{eurosym}{true}}
+ {\setboolean{eurosym}{false}}
+
+% testen ob Paket braket installiert ist
+% benötigt für physikalische Vektoren
+\newboolean{braket}
+\IfFileExists{braket.sty}
+ {\usepackage{braket}
+  \setboolean{braket}{true}}
+ {\setboolean{braket}{false}}
+
+% testen ob Paket cancel installiert ist
+\newboolean{cancel}
+\IfFileExists{cancel.sty}
+ {\usepackage{cancel}
+  \setboolean{cancel}{true}}
+ {\setboolean{cancel}{false}}
+
+% testen ob Paket upgreek installiert ist
+\newboolean{upgreek}
+\IfFileExists{upgreek.sty}
+ {\usepackage{upgreek}
+  \setboolean{upgreek}{true}}
+ {\setboolean{upgreek}{false}}
+
+% benötigt für Kommas in Formeln, siehe Kap. 22.3
+\IfFileExists{icomma.sty}
+ {\usepackage{icomma}}{}
+% Added by lyx2lyx
+\setlength{\parskip}{\medskipamount}
+\setlength{\parindent}{0pt}
+\end_preamble
+\options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
+\use_default_options false
+\begin_modules
+subequations
+\end_modules
+\maintain_unincluded_children no
+\language ngerman
+\language_package default
+\inputencoding utf8
+\fontencoding auto
+\font_roman "lmodern" "default"
+\font_sans "lmss" "default"
+\font_typewriter "lmtt" "default"
+\font_math "auto" "auto"
+\font_default_family default
+\use_non_tex_fonts false
+\font_sc false
+\font_roman_osf false
+\font_sans_osf false
+\font_typewriter_osf false
+\font_sf_scale 100 100
+\font_tt_scale 100 100
+\use_microtype false
+\use_dash_ligatures false
+\graphics default
+\default_output_format pdf2
+\output_sync 0
+\bibtex_command default
+\index_command makeindex
+\paperfontsize 12
+\spacing single
+\use_hyperref true
+\pdf_title "LyXs Mathehandbuch"
+\pdf_author "LyX Team, Uwe Stöhr"
+\pdf_subject "LyX-Dokumentation der Mathefunktionen"
+\pdf_keywords "LyX, Mathed"
+\pdf_bookmarks true
+\pdf_bookmarksnumbered true
+\pdf_bookmarksopen true
+\pdf_bookmarksopenlevel 1
+\pdf_breaklinks false
+\pdf_pdfborder false
+\pdf_colorlinks true
+\pdf_backref false
+\pdf_pdfusetitle false
+\pdf_quoted_options "linkcolor=black, citecolor=black, urlcolor=blue, filecolor=blue, pdfpagelayout=OneColumn, pdfnewwindow=true, pdfstartview=XYZ, plainpages=false"
+\papersize a4
+\use_geometry false
+\use_package amsmath 2
+\use_package amssymb 2
+\use_package cancel 1
+\use_package esint 1
+\use_package mathdots 1
+\use_package mathtools 2
+\use_package mhchem 1
+\use_package stackrel 1
+\use_package stmaryrd 1
+\use_package undertilde 0
+\cite_engine basic
+\cite_engine_type default
+\biblio_style plain
+\use_bibtopic false
+\use_indices false
+\paperorientation portrait
+\suppress_date false
+\justification true
+\use_refstyle 0
+\use_minted 0
+\use_lineno 0
+\notefontcolor #0000ff
+\index Stichwortverzeichnis
+\shortcut idx
+\color #008000
+\end_index
+\secnumdepth 4
+\tocdepth 3
+\paragraph_separation indent
+\paragraph_indentation default
+\is_math_indent 0
+\math_numbering_side default
+\quotes_style german
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 2
+\paperpagestyle plain
+\tablestyle default
+\bullet 1 0 6 -1
+\bullet 2 2 35 -1
+\bullet 3 2 7 -1
+\tracking_changes false
+\output_changes false
+\change_bars false
+\postpone_fragile_content false
+\html_math_output 0
+\html_css_as_file 0
+\html_be_strict false
+\docbook_table_output 0
+\end_header
+
+\begin_body
+
+\begin_layout Title
+\SpecialChar LyX
+' detailliertes Mathe Handbuch
+\end_layout
+
+\begin_layout Section
+Grundlegende Funktionen
+\end_layout
+
+\begin_layout Subsection
+Fortsetzungspunkte
+\end_layout
+
+\begin_layout Standard
+Z.
+\begin_inset space \thinspace{}
+\end_inset
+
+B.
+ ergibt der Befehl 
+\series bold
+A
+\backslash
+dotfill
+\begin_inset space \textvisiblespace{}
+\end_inset
+
+B
+\end_layout
+
+\begin_layout Standard
+\begin_inset Formula $A\dotfill B$
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Analog dazu gibt es für eine Linie den Befehl 
+\series bold
+
+\backslash
+hrulefill
+\series default
+
+\begin_inset Index idx
+status collapsed
+
+\begin_layout Plain Layout
+Befehle ! H ! 
+\backslash
+hrulefill
+\end_layout
+
+\end_inset
+
+:
+\end_layout
+
+\begin_layout Standard
+\begin_inset Formula $A\hrulefill B$
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Um die Befehle für Text zu verwenden, müssen sie im \SpecialChar TeX
+-Modus eingegeben werden.
+\end_layout
+
+\end_body
+\end_document

diff --git a/autotests/export/docbook/doc_de_Math.xml b/autotests/export/docbook/doc_de_Math.xml
new file mode 100644 (file)
index 0000000..5f4a240
--- /dev/null
+++ b/autotests/export/docbook/doc_de_Math.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This DocBook file was created by LyX 2.4.0dev
+  See http://www.lyx.org/ for more information -->
+<article xml:lang="de_DE" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.2">
+<title>LyX' detailliertes Mathe Handbuch</title>
+<section>
+<title>Grundlegende Funktionen</title>
+<section>
+<title>Fortsetzungspunkte</title>
+<para>Z.&#x2009;B. ergibt der Befehl <emphasis role='bold'>A\dotfill&#x2423;B</emphasis></para>
+<para><inlineequation>
+<alt role='tex'>A\dotfill B</alt>
+<mathphrase>MathML export failed. Please report this as a bug.</mathphrase>
+</inlineequation></para>
+<para>Analog dazu gibt es für eine Linie den Befehl <emphasis role='bold'>\hrulefill</emphasis><indexterm><primary>Befehle</primary><secondary>H</secondary><tertiary>\textbackslash hrulefill</tertiary></indexterm>:</para>
+<para><inlineequation>
+<alt role='tex'>A\hrulefill B</alt>
+<mathphrase>MathML export failed. Please report this as a bug.</mathphrase>
+</inlineequation></para>
+<para>Um die Befehle für Text zu verwenden, müssen sie im TeX-Modus eingegeben werden.</para>
+</section>
+</section>
+</article>
\ No newline at end of file

diff --git a/src/output_docbook.cpp b/src/output_docbook.cpp
index 458d8389c005c1ff45bcde09b1af2ce62196a667..077c30487421d756b1b0650e7da2cbda1de60a3d 100644 (file)
--- a/src/output_docbook.cpp
+++ b/src/output_docbook.cpp
@@ -27,6 +27,7 @@
 #include "insets/InsetBibtex.h"
 #include "insets/InsetBibitem.h"
 #include "insets/InsetLabel.h"
+#include "mathed/InsetMath.h"
 #include "insets/InsetNote.h"
 
 #include "support/lassert.h"
@@ -447,8 +448,9 @@ void makeParagraph(
        // Plain layouts must be ignored.
        special_case |= buf.params().documentClass().isPlainLayout(par->layout()) && !runparams.docbook_force_pars;
        // Equations do not deserve their own paragraph (DocBook allows them outside paragraphs).
+       // Exception: any case that generates an <inlineequation> must still get a paragraph to be valid.
        special_case |= nInsets == (size_t) par->size() && std::all_of(par->insetList().begin(), par->insetList().end(), [](InsetList::Element inset) {
-               return inset.inset && inset.inset->asInsetMath();
+               return inset.inset && inset.inset->asInsetMath() && inset.inset->asInsetMath()->getType() != hullSimple;
        });
 
        // TODO: Could get rid of this with a DocBook equivalent to htmlisblock? Not for all cases, unfortunately... See above for those that have been determined not to be allowable for this potential refactoring.