[cpp] Swap "control-line" and "if-section".

With the increased vertical grammar spacing, it is expedient to put the presentation of "control-line" onto the first page so as not to require a huge gap.

Author: tkoeppe

source/preprocessor.tex

@@ -41,12 +41,26 @@
 
 \begin{bnf}
 \nontermdef{group-part}\br
-    if-section\br
     control-line\br
+    if-section\br
     text-line\br
     \terminal{\#} conditionally-supported-directive
 \end{bnf}
 
+\begin{bnftab}
+\nontermdef{control-line}\br
+\>\terminal{\# include}\>\>pp-tokens new-line\br
+\>\terminal{\# define}\>\>identifier replacement-list new-line\br
+\>\terminal{\# define}\>\>identifier lparen identifier-list\opt{} \terminal{)} replacement-list new-line\br
+\>\terminal{\# define}\>\>identifier lparen \terminal{... )} replacement-list new-line\br
+\>\terminal{\# define}\>\>identifier lparen identifier-list, \terminal{... )} replacement-list new-line\br
+\>\terminal{\# undef}\>\>identifier new-line\br
+\>\terminal{\# line}\>\>pp-tokens new-line\br
+\>\terminal{\# error}\>\>pp-tokens\opt new-line\br
+\>\terminal{\# pragma}\>\>pp-tokens\opt new-line\br
+\>\terminal{\# }new-line
+\end{bnftab}
+
 \begin{bnf}
 \nontermdef{if-section}\br
     if-group elif-groups\opt else-group\opt endif-line
@@ -80,20 +94,6 @@
 \>\terminal{\# endif}\>\>new-line
 \end{bnftab}
 
-\begin{bnftab}
-\nontermdef{control-line}\br
-\>\terminal{\# include}\>\>pp-tokens new-line\br
-\>\terminal{\# define}\>\>identifier replacement-list new-line\br
-\>\terminal{\# define}\>\>identifier lparen identifier-list\opt{} \terminal{)} replacement-list new-line\br
-\>\terminal{\# define}\>\>identifier lparen \terminal{... )} replacement-list new-line\br
-\>\terminal{\# define}\>\>identifier lparen identifier-list, \terminal{... )} replacement-list new-line\br
-\>\terminal{\# undef}\>\>identifier new-line\br
-\>\terminal{\# line}\>\>pp-tokens new-line\br
-\>\terminal{\# error}\>\>pp-tokens\opt new-line\br
-\>\terminal{\# pragma}\>\>pp-tokens\opt new-line\br
-\>\terminal{\# }new-line
-\end{bnftab}
-
 \begin{bnf}
 \nontermdef{text-line}\br
     pp-tokens\opt new-line