\usepackage{amssymb}
\usepackage{stmaryrd}
-\title{A MathML Editor Based on \TeX{} Syntax\\Formal Specification}
+\title{\EdiTeX: a MathML Editor Based on \TeX{} Syntax\\\small Description and Formal Specification}
\author{Paolo Marinelli\\Luca Padovani\\\small\{{\tt pmarinel},{\tt lpadovan}\}{\tt @cs.unibo.it}\\\small Department of Computer Science\\\small University of Bologna}
\date{}
+\newcommand{\EdiTeX}{Edi\TeX}
+
\newcommand{\tmap}[1]{\llbracket#1\rrbracket}
\newcommand{\tadvance}{\vartriangle}
\newcommand{\tnext}{\rhd}
\newcommand{\CELL}{\texttt{cell}}
\newcommand{\ROW}{\texttt{row}}
\newcommand{\SLDROP}{\blacktriangleleft}
+\newcommand{\SLDSCRIPT}{\blacktriangleleft_{s}}
\newcommand{\NLDROP}{\vartriangleleft}
+\newcommand{\RGROUP}{\vartriangleleft_{rg}}
+\newcommand{\NLDGP}{\vartriangleleft_{g}}
+\newcommand{\NLDSCRIPT}{\vartriangleleft_{s}}
+\newcommand{\NLDMACRO}{\vartriangleleft_{c}}
+\newcommand{\NLDTABLE}{\vartriangleleft_{t}}
\begin{document}
\maketitle
+\section{Introduction}
+
+MathML~\cite{MathML1,MathML2,MathML2E} is an XML application for the
+representation of mathematical expressions. As most XML applications,
+MathML is unsuitable to be hand-written, except for the simplest
+cases, because of its verbosity. In fact, the MathML specification
+explicitly states that
+\begin{quote}
+``While MathML is human-readable, it is anticipated that, in all but
+the simplest cases, authors will use equation editors, conversion
+programs, and other specialized software tools to generate MathML''
+\end{quote}
+
+The statement about human readability of MathML is already too strong,
+as the large number of mathematical symbols, operators, and
+diacritical marks that are used in mathematical notation cause MathML
+documents to make extensive use of Unicode characters that typically
+are not in the ``visible'' range of common text editors. Such
+characters may appear as entity references, whose name indicates
+somehow the kind of symbol used, or character references or they are
+directly encoded in the document encoding scheme (for instance,
+UTF-8).
+
+It is thus obvious that authoring MathML documents assumes the
+assistance of dedicated tools. As of today, such tools can be
+classified into two main categories:
+\begin{enumerate}
+ \item WYSIWYG (What You See Is What You Get) editors that allow the
+ author to see the formatted document on the screen as it is
+ composed;
+ \item conversion tools that generate MathML markup from different
+ sources, typically other markup languages for scientific
+ documents, such as \TeX.
+\end{enumerate}
+
+While the former tools are certainly more appealing, especially to the
+unexperienced user, as they give a direct visual feedback, the
+existance of tools in the second category takes into account the large
+availability of existing documents in \TeX{} format, and also the fact
+that experienced or ``lazy'' users may continue to prefer the use of a
+markup language other than MathML for editing, and generate MathML
+only as a final step of the authoring process. The ``laziness'' is not
+really intended as a way of being reluctant towards a new technology,
+but rather as a justified convincement that WYSIWYG editors are ``nice
+to look at'' but after all they may slow down the authoring process.
+WYSIWYG editors often involve the use of menus, palettes of symbols,
+and, in general, an extensive use of the pointing device (the mouse)
+for completing most operations. The use of shortcuts is of little
+help, as it implies very soon a challenging exercise for the fingers
+and the mind. Moreover, authors \emph{cannot improve} their authoring
+speed with time. On the other side, the gap between the syntax of any
+markup language for mathematics and mathematical notation may be
+relevant, especially for large, non-trivial formulas and authoring is
+a re-iterated process in which the author repeadtedly types the markup
+in the editor, compiles, and looks at the result inside a pre-viewer.
+
+\EdiTeX{} tries to synthesize the ``best of both worlds'' in a single
+tool. The basic idea is that of creating a WYSIWYG editor in which
+editing is achieved by typing \TeX{} markup as the author would do in
+a text editor. The \TeX{} markup is tokenized and parsed on-the-fly
+and a corresponding MathML representation is created and
+displayed. This way, the author can see the rendered document as it
+changes. The advantages of this approach can be summarized as follows:
+\begin{itemize}
+ \item the document is rendered concurrently with the editing, the
+ user has an immediate feedback hence it is easier to spot errors;
+ \item the author types in a concrete (and likely familiar) syntax
+ improving the editing speed;
+ \item the usual WYSIWYG mechanisms are still available. In
+ particular, it is possible to select \emph{visually} a fragment of
+ the document that needs re-editing, or that was left behind for
+ subsequent editing.
+\end{itemize}
+
+\paragraph{The Name of the Game:} there is no reference to MathML in
+the name ``\EdiTeX.'' In fact, the architecture of the editor is not
+tied to MathML markup. Although we focus on MathML editing, by
+changing a completely modularized component of the editor it is
+virtually possible to generate any other markup language.
+
+\paragraph{Acknowledgments.} Stephen M. Watt and Igor Rodionov for
+their work on the \TeX{} to MathML conversion tool; Stan Devitt for an
+illuminating discussion about the architecture of \TeX{} to XML
+conversion tools; Claudio Sacerdoti Coen for the valuable feedback and
+uncountable bug reports.
+
+\section{Architecture}
+
+\section{Customization}
+
+\subsection{Short and Long Identifiers}
+
+\subsection{The Dictionary}
+
+\subsection{Stylesheets and Trasformations}
+
+\subsection{Rendering}
+
+\section{XML Representation of \TeX{} Markup}
+
\section{Tokens}
The following tokens are defined:
\begin{description}
- %********* rules that try to express situations completely specified (there is an effective deletion) ******
+ \item{\verb+cursor+}\\
+ replace the cursor with the $\NLDROP$.
+
+\end{description}
- % in the rules below, a token is either an i node, an n node, an o node, an s node or an empty c node.
- % an empty c node is either an undefined macro or an empty macro. These c node are handled as they actually were
- % tokens (i, n, o, s).
+\paragraph{Special Left Drop:} $\SLDROP$
- % there is an optional sequence of groups with id, all of which having one and only one child. The last
- % child of this sequence (or the root, if the sequence is empty) is a group with id, has as first element a
- % token and has as second and last element an eventually empty sequence of groups with id, all of which having
- %one and only one child. The last element of this sequence has the cursor as its child.
- \item{\verb+(g[@id][^*$]/++\verb+)?g[@id][^(i|n|o|s|c[ ])#$]/(g[@id][^*$]/++\verb+)?cursor+}\\
- replace the whole fragment with the cursor.
+\begin{description}
%*******************************************************************************************************
%************** rules handling the case in which the cursor has a preceding node ***********************
%*******************************************************************************************************
- %************************* the cursor's parent is a group or a parameter *******************************
+ %************** cursor's parent is a group or a parameter (a p node)
- %we consider an empty macro as a token. An empty macro is either undefined or simply empty.
+ \item{\verb+<g|p>[(i|n|o|s|c[!*])#]/cursor+}\\
+ remove the token.
- %rule handling the case where the cursor has a preceding token and this is the first node of a group with id
- \item{\verb+g[@id][^(i||n||o||s||c[^$])#]/cursor+}\\
- remove the cursor and replace the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node with the $\NLDROP$.
- \item{\verb+<g|p>[(i||n||o||s||c[^$])#]/cursor+}\\
- remove the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
- %it corresponds to the drop_prev_group(false).
\item{\verb+<g|p>[g#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \G{} node.
- %corresponds to the drop_prev_script(false).
- \item{\verb+<g|p>[(<sp|sb>)#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \SP{} or \SB{} node.
- %rules handling the right open macros preceding the cursor.
- \item{\verb+<g|p>[(c[^p[@right-open='1']$])#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \PNODE{} node.
- %we don't have a macro of this kind, but we don't know the future...
- \item{\verb+<g|p>[(c[^p[!(@right-open='1')][@left-open='1'][^$]$])#]/cursor+}\\
- remove the cursor and replace the \CNODE node with the $\NLDROP$.
- \item{\verb+<g|p>[(c[^p[!(@right-open='1')][@left-open='1']$])#]/cursor+}\\
- replace the \CNODE{} node with the content of the \PNODE node and replace the cursor with the $\NLDROP$.
- %rules handling macro with parameter(s) and preceding the cursor.
- \item{\verb+<g|p>[c#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \CNODE{} node.
- %rule handling table with rows preceding the cursor.
- \item{\verb+<g|p>[(table[row[cell[^g$]$]$])#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \G{} node, which is child of the \CELL{} node.
- %rule handling tables without rows preceding the cursor.
- \item{\verb+<g|p>[table#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the \TABLE{} node
-
- %********************************* the cursor's parent is a script ******************************
-
- %rule handling the case where the script's base is an empty group with id.
- \item{\verb+<sp|sb>[^(g[@id][^$])#$]/cursor+}\\
- replace the \SP{} or \SB{} node with the $\NLDROP$.
- %rule handling the case where the script's base is an empty group without id
- \item{\verb+<sp|sb>[^(g[^$])#$]/cursor+}\\
- replace the \SP{} or \SB{} node with the cursor.
- %rule handling the case where the script's base is something else
- \item{\verb+<sp|sb>[^*#$]/cursor+}\\
- replace the \SP{} or \SB{} node with it's first child and insert the $\NLDROP$ after it.
-
- %********************************* the cursor's parent is a macro ********************************
-
- %rule handling the case where the preceding node is a parameter
- \item{\verb+c[p#]/cursor+}\\
- remove the cursor and append the $\NLDROP$ to the PNODE{} node.
- %rule handling the case where the preceding node is a delimiter
- \item{\verb+c[(<i|n|o|s|c>)#]/cursor+}\\
- remove the cursor and insert the $\NLDROP$ before the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
+ remove the cursor and append it to the \G{} node.
+
+ \item{\verb+<g|p>[<sp|sb>#]cursor+}\\
+ remove the cursor and append the $\SLDSCRIPT$
+
+ \item{\verb+<g|p>[c[p[@right-open="1"]$]#]/cursor+}\\
+ remove the cursor and append the it to the \PNODE{} node.
+
+ % remember to add the rules handling the primes
%*************************************************************************************************
%*********** rules handling the case in which the cursor has no preceding nodes ******************
%*************************************************************************************************
- %rule handling the case where the cursor has something else after it
- \item{\verb+<g|p>[#*]/cursor+}\\
- nothing to drop.
-
- %rules handling the case where the cursor's parent is a p node and the cursor has no nodes after it.
-
- %rule handling the case where the p node is a left and right open macro's child and the first p node has no elements.
- \item{\verb+c[^(p[@left-open='1'][^$])#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the $\NLDROP$.
- %rule handling the case where the p node is a left and right open macro's child and the first p node has elements.
- \item{\verb+c[^(p[@left-open='1']#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the content of the PNODE{} with attribute texttt{left-open='1'} and insert $\NLDROP$ after this.
- %rule handling the case where the p node is right open macro's child.
- \item{\verb+c[^#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the $\NLDROP$.
- %rule handling the case where the p node is a macro's child and this macro has parameter.
- \item{\verb+c/p[^#$]/cursor+}\\
- remove the cursor and insert the $\NLDROP$ before the \PNODE{} node.
-
- %rule handling the case where the cursor has no nodes after it and its parent is a group with id
\item{\verb+g[@id][^#$]/cursor+}\\
- replace the \G{} node with the $\NLDROP$.
+ replace the \G{} node with the cursor.
\end{description}
-\paragraph{Special Left Drop:} $\SLDROP$
+\section{Right Drop Rules}
+
+\section{$\varepsilon$-rules}
+
+\paragraph{Nromal Left Drop}
\begin{description}
- %*******************************************************************************************************
- %************** rules handling the case in which the cursor has a preceding node ***********************
- %*******************************************************************************************************
+ %**************************************************************************************
+ %****************************** epsilon-rules with \NLDROP ****************************
+ %**************************************************************************************
- %************************* the cursor's parent is a group or a parameter *******************************
+ %***************************** \NLDROP has no preceding nodes *************************
- %this rule is more specific than the one below which handle the case of the cursor preceded by a c node
- \item{\verb+<g|p>[(i||n||o||s||c[^$])#]/cursor+}\\
- remove the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
- %it corresponds to the drop_prev_group(true).
- \item{\verb+<g|p>[g#]/cursor+}\\
- remove the cursor and append the it to the \G{} node.
- %corresponds to the drop_prev_script(true).
- \item{\verb+<g|p>[(<sp|sb>)#]/cursor+}\\
- remove the cursor and append the $\SLDROP$ to the \SP{} or \SB{} node.
- %rules handling the right open macros preceding the cursor.
- \item{\verb+<g|p>[(c[^p[@right-open='1']$])#]/cursor+}\\
- remove the cursor and append the $\SLDROP$ to the \PNODE{} node.
- %we don't have a macro of this kind, but we don't know the future...
- \item{\verb+<g|p>[(c[^p[!(@right-open='1')][@left-open='1'][^$]$])#]/cursor+}\\
- remove the cursor and replace the \CNODE node with the cursor.
- \item{\verb+<g|p>[(c[^p[!(@right-open='1')][@left-open='1']$])#]/cursor+}\\
- replace the \CNODE{} node with the content of the \PNODE node.
- %rule handling macro with parameter(s) and preceding the cursor.
- \item{\verb+<g|p>[c#]/cursor+}\\
- remove the cursor and append the $\SLDROP$ to the \CNODE{} node.
- %rule handling table with rows preceding the cursor.
- \item{\verb+<g|p>[(table[row[cell[^g$]$]$])#]/cursor+}\\
- remove the cursor and append the it to the \G{} node, which is child of the \CELL{} node.
- %rule handling tables without rows preceding the cursor.
- \item{\verb+<g|p>[table#]/cursor+}\\
- remove the cursor and append the $\SLDROP$ to the \TABLE{} node
-
- %********************************* the cursor's parent is a script ******************************
-
- %rule handling the case where the script's base is an empty group with id.
- \item{\verb+<sp|sb>[^(g[@id][^$])#$]/cursor+}\\
- replace the \SP{} or \SB{} node with the \G{} node and insert the cursor after it.
- %rule handling the case where the script's base is an empty group without id
- \item{\verb+<sp|sb>[^(g[^$])#$]/cursor+}\\
- replace the \SP{} or \SB{} node with the cursor.
- %rule handling the case where the scrip's base is something else
- \item{\verb+<sp|sb>[^*#$]/cursor+}\\
- replace the \SP{} or \SB{} node with it's first child and insert the cursor after it.
-
- %********************************* the cursor's parent is a macro ********************************
-
- %rule handling the case where the preceding node is a parameter
- \item{\verb+c[p#]/cursor+}\\
- remove the cursor and append the $\SLDROP$ to the PNODE{} node.
- %rule handling the case where the preceding node is a delimiter
- \item{\verb+c[(<i|n|o|s|c>)#]/cursor+}\\
- remove the cursor and insert the it before the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
+ \item{\verb+math[^#$]/+$\NLDROP$}\\
+ replace the $\NLDROP$ with the cursor.
- %*************************************************************************************************
- %*********** rules handling the case in which the cursor has no preceding nodes ******************
- %*************************************************************************************************
+ \item{\verb+g[^#$]/+$\NLDROP$}\\
+ replace the \G{} node with the $\NLDROP$.
- %rule handling the case where the cursor has something else after it
- \item{\verb+<g|p>[#*]/cursor+}\\
- nothing to drop.
-
- %rules handling the case where the cursor's parent is a p node and the cursor has no nodes after it.
-
- %rule handling the case where the p node is a left and right open macro's child and the first p node has no elements.
- \item{\verb+c[^(p[@left-open='1'][^$])#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the cursor.
- %rule handling the case where the p node is a left and right open macro's child and the first p node has elements.
- \item{\verb+c[^(p[@left-open='1']#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the content of the PNODE{} with attribute texttt{left-open='1'} and insert cursor after this.
- %rule handling the case where the p node is right open macro's child.
- \item{\verb+c[^#$]/p[@right-open='1'][^#$]/cursor+}\\
- replace the \CNODE{} with the cursor.
- %rule handling the case where the p node is a macro's child and this macro has parameter.
- \item{\verb+c/p[^#$]/cursor+}\\
- remove the cursor and insert the $\SLDROP$ before the \PNODE{} node.
-
- %rule handling the case where the cursor has no nodes after it and its parent is a group with id
- \item{\verb+g[@id][^#$]/cursor+}\\
- replace the \G{} node with the cursor.
+ % this rule overrides the rule above
+ \item{\verb+math/g[^#$]/+$\NLDROP$}\\
+ replace the $\NLDROP$ with the cursor.
-\end{description}
+ \item{\verb+c/p[^#$]/+$\NLDROP$}\\
+ remove the $\NLDROP$ and insert it before the \PNODE{} node.
-\section{Right Drop Rules}
+ \item{\verb+cell[^#$]/+$\NLDROP$}\\
+ replace the cell with the $\NLDROP_n$.
-\section{$\varepsilon$-rules}
+ \item{\verb+table[^#$]/+$\NLDROP$}\\
+ replace the \TABLE{} node with the $\NLDROP$.
-\paragraph{Nromal Left Drop}
+ \item{\verb+c[p[@left-open='1'][*]#$]/p[@right-open='1'][^#$]/+$\NLDROP$}\\
+ replace the \CNODE{} node with the content of the first \PNODE{} node and insert the $\NLDROP$ after this content
-\begin{description}
+ \item{\verb+c[p[@left-open='1'][!*]#$]/p[@right-open='1'][^#$]/+$\NLDROP$}\\
+ replace the \CNODE{} node with the $\NLDROP$.
+
+ \item{\verb+c[^#][!p(*)]/+$\NLDROP$}\\
+ replace the \CNODE{} node with the $\NLDROP$.
+
+ %************************* \NLDROP has at least one preceding node *********************
+
+ % general rules
+
+ % this rule should also handles the case where the \NLDROP is the third (and last) child of a script.
+ \item{\verb+*[*#]/+$\NLDROP$}\\
+ remove the $\NLDROP$ and append it as the last child of its ex preceding brother.
+
+ % this rule overrides the one above
+ \item{\verb+*[<i|n|o|s>#]/+$\NLDROP$}\\
+ remove the $\NLDROP$ and replace the token with the $\NLDROP_n$.
+
+ % special rules
+
+ \item{\verb+<sp|sb>[^*#$]+/$\NLDROP$}\\
+ replace the script node with its first child and insert the $\NLDROP$ after it.
+
+ % this rule overrides the one above.
+ \item{\verb+<sp|sb>[^g[!@id][!*]#$]/+$\NLDROP$}\\
+ replace the script with the cursor.
+
+ % this rule overrides the one above
+ \item{\verb+*[sp[!@id][^*g[!@id][^o[@name='prime']++\verb+o[@name='prime']$]]#]/+$\NLDROP$}\\
+ remove the last \ONODE{} node and replace the $\NLDROP$ with the cursor.%$\NLDROP_n$.
+
+ \item{\verb+*[sp[!@id][^*g[!@id][^o[@name='prime']$]]#]/+$\NLDROP$}\\
+ replace the script with its first child and replace the $\NLDROP$ with the cursor.%$\NLDROP_n$.
+ \item{\verb+c[(i|n|o|s|c[!*])#]/+$\NLDROP$}\\
+ move the $\NLDROP$ before the delimiter.
- %********************************************* \NLDROP has a preceding node *********************************************
-
- %rule handling the case where the preceding node is a token or an empty macro.
- \item{\verb+*[(i||n||o||s||c[^$])#]/+$\NLDROP$}\\
- remove the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or the \CNODE{} node.
- %rule handling the case where the preceding node is a group
- \item{\verb+*[g#]/+$\NLDROP$}\\
- remove the $\NLDROP$ append it to the \G{} node.
- %rule handling the case where the preceding node is a script
- \item{\verb+*[<sp|sb>#]/+$\NLDROP$}\\
- remove the $\NLDROP$ append it to the \SP{} or \SB{} node.
- %rule handling the case where the preceding node is an open-right macro
- \item{\verb+*[(c[^p[@right-open='1']$])#]/+$\NLDROP$}\\
- remove the $\NLDROP$ and append it to the \PNODE{} node.
- %rule handling the case where the preceding node is a left-open macro (and not right-open), and the p node of this macro has no children
- \item{\verb+*[(c[^p[!(@right-open='1')][@left-open='1'][^$]$])#]/+$\NLDROP$}\\
- remove the \CNODE node.
- %rule handling the case where the preceding node is a left-open macro (and not right-open), and the p node of this macro has children
- \item{\verb+*[(c[^p[!(@right-open='1')][@left-open='1']$])#]/+$\NLDROP$}\\
- replace the \CNODE{} node with the content of the \PNODE{} node.
- %rule handling the case where the preceding node is a macro with parameter(s)
- \item{\verb+*[c#]/+$\NLDROP$}\\
- remove the $\NLDROP$ and append it to the \CNODE{} node.
-
- %rule handling the deletion of primes in superscript
-
- %there are more than one prime in the phantom group
- \item{\verb+sp[!(@id)][*#$]/g[!(@id)][o#]/+$\NLDROP$}\\
- remove the \ONODE node, remove the $\NLDROP$ and insert the cursor after the \SP{} node.
- %there is one and only one prime in the phantom group
- \item{\verb+sp[!(@id)][*#$]/g[!(@id)][^o#]/+$\NLDROP$}\\
- replace the \SP{} node with it's first child and insert the cursor after it
-
- %*** rules handling the case where the \NLDROP's parent is a macro (with parameter) ***
-
- %the node preceding the \NLDROP is a delimiter
- \item{\verb+c[(<i|n|o|s|c>)#]/+$\NLDROP$}\\
- remove the $\NLDROP$ and insert it before the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
- %the node preceding the \NLDROP is parameter
+ % this rule is true for both right-open and parameterized macros.
\item{\verb+c[p#]/+$\NLDROP$}\\
- remove the $\NLDROP$ and append it to the \PNODE{} node.
+ move the $\NLDROP$ into the \PNODE{} node.
- %********************************************* the \NLDROP has no preceding nodes ****************************************************
+ %**************** \NLDROP has no preceding nodes, but has following nodes **************
- %if the \NLDROP has no preceding nodes, but has following nodes...
- \item{\verb+<g|p>[#*]/+$\NLDROP$}\\
+ % general rule
+ \item{\verb+*[^#*]/+$\NLDROP$}\\
+ remove the $\NLDROP$ and insert it before its parent.
+
+ % special rules
+
+ \item{\verb+math/g[^#*]/+$\NLDROP$}\\
replace the $\NLDROP$ with the cursor.
- %rule handling the case where the $\NLDROP$ is the only child of a group with id.
- \item{\verb+g[@id][^#$]/+$\NLDROP$}\\
- replace the \G{} node with the $\NLDROP$.
- %\NLDROP is the first child of a macro with no inserted parameter
- \item{\verb+c[!(p[*])][^#]/+$\NLDROP$}\\
- replace the \CNODE{} with the $\NLDROP$.
- %\NLDROP is the first child of a macro with some inserted parameter
- \item{\verb+c[p[*]][^#]/+$\NLDROP$}\\
- put the cursor in the first \PNODE{} node.
-
-
- %**** rule handling the case where the \NLDROP has a preceding token or a preceding empty macro, which is either undefined or empty ****
-
- %%the \NLDROP's parent is neither a macro nor a phantom group which in turn is a sp's child and the token is a prime
- %\item{\verb+*[(i||n||o||s||c[^$])#]/+$\NLDROP$}\\
- %replace the \INODE{}, \NNODE{}, \SNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node with the cursor and remove the $\NLDROP$.
- %%the \NLDROP's parent is a macro with argument
- %\item{\verb+c[((!(p[@left-open='1']))&(!(p[@right-open+'1'])))][(i||n||o||s||c[^$])#]/+$\NLDROP$}\\
- %remove the $\NLDROP$ and insert it before the \INODE{}, \NNODE{}, \ONODE{}, \SNODE{} or \CNODE{} node.
- %%rule handling the case where the \NLDROP's parent is a phantom group, which in turn is a sp's child
- %\item{\verb+sp[!(@id)][^*#$]/g[!(@id)][o#$]/+$\NLDROP$}\\
- %remove the \ONODE{} node
-
- %********************************* rules handling the case where the \NLDROP has a preceding group **************************************
- \item{\verb+*[g#]/+$\NLDROP$}\\
- remove the $\NLDROP$ and append it to the \G{} node.
-\end{description}
+ % this rule is applicable to all macros.
+ \item{\verb+c[^#][p[*]]/+$\NLDROP$}\\
+ remove the $\NLDROP$ and insert it before the \CNODE{} node.
-\paragraph{Special Left Drop}
+ %****************************************************************************************
+ %***************************** epsilon-rules with \NLDROP_n *****************************
+ %****************************************************************************************
-\begin{description}
+ \item{\verb+*[*#]/+$\NLDROP_n$}\\
+ replace the $\NLDROP_n$ with the cursor.
+
+ \item{\verb+row[cell#]/+$\NLDROP_n$}\\
+ remove the $\NLDROP_n$ and append the cursor as the last child of the \CELL{} node.
- \item{special left}\\
+ \item{\verb+row[^#$]/+$\NLDROP_n$}\\
+ replace the \ROW{} node with the $\NLDROP_n$
+
+ \item{\verb+table[row#]/+$\NLDROP_n$}\\
+ remove the $\NLDROP_n$ and append it as last child of the \ROW{} node.
+
+ \item{\verb+table[^#$]/+$\NLDROP_n$}\\
+ replace the \texttt{table} with the cursor.%$\NLDROP_n$.
+
+ \item{\verb+g[@id][^#$]/+$\NLDROP_n$}\\
+ replace the \G{} node with the $\NLDROP_n$.
\end{description}
+\paragraph{Special Left Drop}
+
+%\begin{description}
+
+%\end{description}
+
\paragraph{Advance}
\begin{description}
projects / helm.git / blobdiff