>From 0590665e74862cbbe59a432313cb36d55f8cee92 Mon Sep 17 00:00:00 2001
From: Akira Yokosawa <akiyks@xxxxxxxxx>
Date: Sun, 18 Nov 2018 00:04:46 +0900
Subject: [PATCH] styleguide: Expand on goal of new snippet scheme
Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx>
---
appendix/styleguide/samplecodesnippetfcv.tex | 4 +-
appendix/styleguide/samplecodesnippetlst.tex | 2 +-
appendix/styleguide/samplecodesnippetlstlbl.tex | 2 +-
appendix/styleguide/styleguide.tex | 79 +++++++++++++++++--------
4 files changed, 59 insertions(+), 28 deletions(-)
diff --git a/appendix/styleguide/samplecodesnippetfcv.tex b/appendix/styleguide/samplecodesnippetfcv.tex
index 4e03b2a..b47b7f5 100644
--- a/appendix/styleguide/samplecodesnippetfcv.tex
+++ b/appendix/styleguide/samplecodesnippetfcv.tex
@@ -1,5 +1,5 @@
\begin{listing}[tb]
-\begin{linelabel}[ln:base1] %lnlbl~linelabel^
+\begin{linelabel}[ln:base1] %lnlbl~beg:linelabel^
\begin{VerbatimL}[commandchars=\$\[\]]
/*
* Sample Code Snippet
@@ -11,7 +11,7 @@ int main(void)
return 0; $lnlbl[return]
}
\end{VerbatimL}
-\end{linelabel}
+\end{linelabel} %lnlbl~end:linelabel^
\caption{Sample Code Snippet}
\label{lst:app:styleguide:Sample Code Snippet}
\end{listing}
diff --git a/appendix/styleguide/samplecodesnippetlst.tex b/appendix/styleguide/samplecodesnippetlst.tex
index b18922e..43638b6 100644
--- a/appendix/styleguide/samplecodesnippetlst.tex
+++ b/appendix/styleguide/samplecodesnippetlst.tex
@@ -1,4 +1,4 @@
-\begin{listing}
+\begin{listing}[tb]
{ \scriptsize
\begin{verbbox}[\LstLineNo]
/*
diff --git a/appendix/styleguide/samplecodesnippetlstlbl.tex b/appendix/styleguide/samplecodesnippetlstlbl.tex
index d3e4a95..c0558d8 100644
--- a/appendix/styleguide/samplecodesnippetlstlbl.tex
+++ b/appendix/styleguide/samplecodesnippetlstlbl.tex
@@ -1,4 +1,4 @@
-\begin{listing}
+\begin{listing}[tb]
{ \scriptsize
\begin{verbbox}[\LstLineNo] %lnlbl@lineno$
/* %lnlbl@b$
diff --git a/appendix/styleguide/styleguide.tex b/appendix/styleguide/styleguide.tex
index 0587898..768a0e1 100644
--- a/appendix/styleguide/styleguide.tex
+++ b/appendix/styleguide/styleguide.tex
@@ -322,13 +322,30 @@ This section explains the use cases of such macros and environments.
\subsubsection{Code Snippet}
\label{sec:app:styleguide:Code Snippet}
-Because the \qco{verbatim} environment is a primitve way to include
+Because the \qco{verbatim} environment is a primitive way to include
listings, we are transitioning to a new scheme which uses
the \qco{fancyvrb} package for code snippets.
-Three customized environments of \qco{Verbatim} are defined
-for perfbook.
+The goal of the new scheme is to extract \LaTeX\ sources of
+code snippets directly from code samples under \path{CodeSamples}
+directory.
+It also makes it possible to embed line labels in the code samples,
+which can be referred from the text.
+This will reduce the burden of keeping line numbers
+in the text consistent with those in code snippets.
+Extraction of code snippets is covered by a couple of
+perl scripts and recipes in Makefile. Embedding line labels is
+realized by using escaping feature provided by the \co{fancyvrb} package.
+
+We used to use the \qco{verbbox} environment provided
+by the \qco{verbatimbox} package. As is described in
+Section~\ref{sec:app:styleguide:Code Snippet (Obsolete)},
+\co{verbbox} has the capability of automatic line numbering.
+However, it is impossible to label lines to refer from the text.
+
+Let's start by looking at how code snippets are coded in the new scheme.
+There are three customized environments of \qco{Verbatim}.
\qco{VerbatimL} is for floating snippets within the \qco{listing}
environment. \qco{VerbatimN} is for inline snippets with line count
enabled. \qco{VerbatimU} is for inline snippets without line count.
@@ -349,20 +366,6 @@ They are defined in the preamble as shown below:
samepage=true,frame=single}
\end{VerbatimU}
-We used to use the \qco{verbbox} environment provided
-by the \qco{verbatimbox} package. As will be described later in
-Section~\ref{sec:app:styleguide:Code Snippet (Obsolete)},
-\co{verbbox} has the capability of automatic
-line numbering. However, it is not possible to embed labels on lines
-in the snippet to refer from the text.
-
-The \co{fancyvrb} package allows us to do that by the help of
-escaping feature.
-And the \LaTeX\ sources of snippets can be extracted from code samples under
-the \path{CodeSamples} directory of perfbook tree.
-
-Conversion to the new scheme is currently underway.
-
% Another option would be the ``lstlisting'' environment provided
% by the ``listings'' package. We are already using its ``lstinline''
% command in the definition of \co{\\co\{\}} macro.
@@ -410,13 +413,39 @@ to from text.
\end{lineref}
\end{quote}
-\LaTeX\ source shown in
+Macros \qco{\\lnlbl\{\}} and \qco{\\lnref\{\}} are defined in
+the preamble as follows:
+
+\begin{VerbatimU}
+\newcommand{\lnlblbase}{}
+\newcommand{\lnlbl}[1]{%
+ \phantomsection\label{\lnlblbase:#1}}
+\newcommand{\lnrefbase}{}
+\newcommand{\lnref}[1]{\ref{\lnrefbase:#1}}
+\end{VerbatimU}
+
+Environments \qco{linelabel} and \qco{lineref} are defined as
+shown below:
+
+\begin{VerbatimU}
+\newenvironment{linelabel}[1][]{%
+ \renewcommand{\lnlblbase}{#1}%
+ \ignorespaces}{\ignorespacesafterend}
+\newenvironment{lineref}[1][]{%
+ \renewcommand{\lnrefbase}{#1}%
+ \ignorespaces}{\ignorespacesafterend}
+\end{VerbatimU}
+
+\begin{lineref}[ln:app:styleguide:LaTeX Source of Sample Code Snippet (Current)]
+The main part of \LaTeX\ source shown on
+Lines~\lnref{beg:linelabel}-\lnref{end:linelabel} in
Listing~\ref{lst:app:styleguide:LaTeX Source of Sample Code Snippet (Current)}
can be extracted from a code sample of
Listing~\ref{lst:app:styleguide:Source of Code Sample} by a perl script
\path{utilities/fcvextract.pl}. All the relevant rules of extraction
are described as recipes in the top level \path{Makefile} and
a script to generate dependencies (\path{utilities/gen_snippet_d.pl}).
+\end{lineref}
\begin{listing}[tb]
\fvset{fontsize=\scriptsize,numbers=left,numbersep=5pt,xleftmargin=9pt,obeytabs=true,tabsize=8}
@@ -427,7 +456,7 @@ a script to generate dependencies (\path{utilities/gen_snippet_d.pl}).
\end{listing}
As you can see, Listing ~\ref{lst:app:styleguide:Source of Code Sample}
-has meta commands in comments of C (C++ style). These meta commands
+has meta commands in comments of C (C++ style). Those meta commands
are interpreted by \path{utilities/fcvextract.pl}, which distinguishes
the type of comment style by the suffix of code sample's file name.
@@ -446,15 +475,17 @@ labelbase=<label base string>
commandchars=\X\Y\Z
\end{VerbatimU}
-The string given to \qco{labelbase} will be converted to
+The string given to \qco{labelbase} will be passed to
``\co{\\begin\{linelabel\}[<label base string>]}'' command as shown on
-line~\ref{ln:app:styleguide:LaTeX Source of Sample Code Snippet (Current):linelabel} of
+line~\ref{ln:app:styleguide:LaTeX Source of Sample Code Snippet (Current):beg:linelabel} of
Listing~\ref{lst:app:styleguide:LaTeX Source of Sample Code Snippet (Current)}.
\qco{commandchars} option is given to the \co{VerbatimL} environment as is.
Other types of options, if any, are also passed to the \co{VerbatimL}
environment.
-The \qco{lnlbl} commands are converted to reflect the escape-character choice
-along the way.
+The \qco{lnlbl} commands are converted along the way to reflect
+the escape-character choice.\footnote{
+ Characters forming comments are also gobbled up.
+}
There can be multiple pairs of \co{\\begin\{snippet\}} and \co{\\end\{snippet\}}
as long as they have unique \qco{labelbase} strings.
@@ -492,7 +523,7 @@ Comments in this part should be of the form \qco{(* ... *)}.
You can't use \qco{\{} and \qco{\}} in comments in litmus tests, either.
-Example of disallowed comments in a litmus test are shown below:
+Examples of disallowed comments in a litmus test are shown below:
\begin{linelabel}[ln:app:styleguide:Bad comments in Litmus Test]
\begin{VerbatimN}[tabsize=8]
--
2.7.4
