From 77577f45fa2d9bed7318eade1dae74923618e704 Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Wed, 7 Feb 1990 10:49:30 +0000
Subject: [PATCH] Documented %prefix

---
 doc/LLgen/LLgen.n | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/doc/LLgen/LLgen.n b/doc/LLgen/LLgen.n
index db66aac3b..dfb8184b9 100644
--- a/doc/LLgen/LLgen.n
+++ b/doc/LLgen/LLgen.n
@@ -703,6 +703,25 @@ can be "#\ include"d in any file that needs the token-names.
 The lexical analyzer must signal the end
 of input to \fILLparse\fR
 by returning a number less than or equal to zero.
+.NH
+Programs with more than one parser
+.PP
+\fILLgen\fR offers a simple facility for having more than one parser in
+a program: in this case, the user can change the names of global procedures,
+variables, etc, by giving a different prefix, like this:
+.sp 1
+.nf
+.ft CW
+%prefix XX ;
+.ft R
+.fi
+.sp 1
+The effect of this is that all global names start with XX instead of LL, for
+the parser that has this prefix. This holds for the variables \fILLsymb\fP,
+which now is called \fIXXsymb\fP, and also for the routine \fILLmessage\fP,
+which must now be called \fIXXmessage\fP.
+\fILL.output\fP is now \fIXX.output\fP, and \fILpars.c\fP and \fILpars.h\fP
+are now called \fIXXpars.c\fP and \fIXXpars.h\fP.
 .bp
 .SH
 References
@@ -741,6 +760,7 @@ version of \fILLgen\fR is written with \fILLgen\fR.
 %token  PREFER;        /* %prefer */
 %token  DEFAULT;       /* %default */
 %token  LEXICAL;       /* %lexical */
+%token  PREFIX;        /* %prefix */
 %token  ONERROR;       /* %onerror */
 %token  FIRST;         /* %first */
 
@@ -771,6 +791,9 @@ declaration
         | LEXICAL
                 IDENTIFIER
           ';'
+        | PREFIX
+                IDENTIFIER
+          ';'
         | ONERROR
                 IDENTIFIER
 	  ';'