[std] Switch grammar to \sffamily \itshape

Compensate the slightly heavier font by color {gray}{0.2}.

Author: jensmaurer

source/classes.tex

@@ -5740,7 +5740,6 @@
 \end{codeblock}
 \end{example}
 \begin{note}
-\setlength{\emergencystretch}{1em}
 The initialization
 performed by each \grammarterm{mem-initializer}
 constitutes a full-expres\-sion\iref{intro.execution}.

source/declarations.tex

@@ -6251,7 +6251,7 @@
 A coroutine behaves as if its \grammarterm{function-body} were replaced by:
 \begin{ncsimplebnf}
 \terminal{\{}\br
-\bnfindent promise-type \exposid{promise} promise-constructor-arguments \terminal{;}\br
+\bnfindent \placeholder{promise-type} \exposid{promise} \placeholder{promise-constructor-arguments} \terminal{;}\br
 % FIXME: \bnfindent \exposid{promise}\terminal{.get_return_object()} \terminal{;}
 % ... except that it's not a discarded-value expression
 \bnfindent \terminal{co_await} \terminal{\exposid{promise}.initial_suspend()} \terminal{;}\br

source/macros.tex

@@ -202,9 +202,10 @@
 \newcommand{\CodeStyle}{\ttfamily}
 \newcommand{\CodeStylex}[1]{\texttt{#1}}
 
+\definecolor{grammar-gray}{gray}{0.2}
+
 % General grammar style
-\newcommand{\GrammarStyle}{\itfamily}
-\newcommand{\GrammarStylex}[1]{\textit{#1}}
+\newcommand{\GrammarStylex}[1]{\textcolor{grammar-gray}{\textsf{\textit{#1}}}}
 
 % Code and definitions embedded in text.
 \newcommand{\tcode}[1]{\CodeStylex{#1}}
@@ -214,7 +215,7 @@
 \newcommand{\keyword}[1]{\tcode{#1}\indextext{\idxcode{#1}}}
 \newcommand{\grammarterm}[1]{\indexgram{\idxgram{#1}}\gterm{#1}}
 \newcommand{\grammartermnc}[1]{\indexgram{\idxgram{#1}}\gterm{#1\nocorr}}
-\newcommand{\regrammarterm}[1]{\gterm{#1}}
+\newcommand{\regrammarterm}[1]{\textit{#1}}
 \newcommand{\placeholder}[1]{\textit{#1}}
 \newcommand{\placeholdernc}[1]{\textit{#1\nocorr}}
 \newcommand{\exposid}[1]{\tcode{\placeholder{#1}}}
@@ -240,7 +241,7 @@
 \newcommand{\CppXI}{\Cpp{} 2011}
 \newcommand{\CppXIV}{\Cpp{} 2014}
 \newcommand{\CppXVII}{\Cpp{} 2017}
-\newcommand{\opt}[1]{#1\ensuremath{_\mathit{opt}}}
+\newcommand{\opt}[1]{#1\ensuremath{_\mathit{\color{black}opt}}}
 \newcommand{\dcr}{-{-}}
 \newcommand{\bigoh}[1]{\ensuremath{\mathscr{O}(#1)}}
 
@@ -526,16 +527,17 @@
 \setlength{\BnfInc}{\BnfIndent}
 \newlength{\BnfRest}
 \setlength{\BnfRest}{2\BnfIndent}
-\newcommand{\BnfNontermshape}{\small\rmfamily\itshape}
+\newcommand{\BnfNontermshape}{\small\color{grammar-gray}\sffamily\itshape}
+\newcommand{\BnfReNontermshape}{\small\rmfamily\itshape}
 \newcommand{\BnfTermshape}{\small\ttfamily\upshape}
 
 \newenvironment{bnfbase}
  {
  \newcommand{\nontermdef}[1]{{\BnfNontermshape##1\itcorr}\indexgrammar{\idxgram{##1}}\textnormal{:}}
- \newcommand{\renontermdef}[1]{{\BnfNontermshape##1\itcorr}\,\textnormal{::}}
  \newcommand{\terminal}[1]{{\BnfTermshape ##1}}
  \renewcommand{\keyword}[1]{\terminal{##1}\indextext{\idxcode{##1}}}
- \renewcommand{\exposid}[1]{\terminal{\placeholder{##1}}}
+ \renewcommand{\exposid}[1]{\terminal{\textit{##1}}}
+ \renewcommand{\placeholder}[1]{\textrm{\textit{##1}}}
  \newcommand{\descr}[1]{\textnormal{##1}}
  \newcommand{\bnfindent}{\hspace*{\bnfindentfirst}}
  \newcommand{\bnfindentfirst}{\BnfIndent}
@@ -572,6 +574,19 @@
  \end{bnfbase}
 }
 
+\newenvironment{ncrebnf}
+{
+ \begin{bnfbase}
+ \newcommand{\renontermdef}[1]{{\BnfReNontermshape##1\itcorr}\,\textnormal{::}}
+ \begin{bnflist}
+ \BnfReNontermshape
+ \item\relax
+}
+{
+ \end{bnflist}
+ \end{bnfbase}
+}
+
 % non-copied versions of bnf environments
 \let\ncsimplebnf\simplebnf
 \let\endncsimplebnf\endsimplebnf

source/regex.tex

@@ -3680,7 +3680,7 @@
 \pnum
 The following productions within the ECMAScript grammar are modified as follows:
 
-\begin{ncbnf}
+\begin{ncrebnf}
 \renontermdef{ClassAtom}\br
   \terminal{-}\br
   ClassAtomNoDash\br
@@ -3690,12 +3690,12 @@
 
 \renontermdef{IdentityEscape}\br
   SourceCharacter \textnormal{\textbf{but not}} \terminal{c}
-\end{ncbnf}
+\end{ncrebnf}
 
 \pnum
 The following new productions are then added:
 
-\begin{ncbnf}
+\begin{ncrebnf}
 \renontermdef{ClassAtomExClass}\br
   \terminal{[:} ClassName \terminal{:]}
 
@@ -3711,7 +3711,7 @@
 
 \renontermdef{ClassNameCharacter}\br
   SourceCharacter \textnormal{\textbf{but not one of}} \terminal{.} \textnormal{\textbf{or}} \terminal{=} \textnormal{\textbf{or}} \terminal{:}
-\end{ncbnf}
+\end{ncrebnf}
 
 \pnum
 The productions \regrammarterm{ClassAtomExClass}, \regrammarterm{ClassAtomCollatingElement}

source/std.tex

@@ -26,6 +26,7 @@
 \usepackage[final]{microtype}
 \usepackage{multicol}
 \usepackage{lmodern}
+\usepackage{xcolor}
 \usepackage[T1]{fontenc}
 \usepackage[pdftex, final]{graphicx}
 \usepackage[pdftex,