From: Vern Paxson <vern@ee.lbl.gov>
Date: Sun, 5 Mar 1995 20:37:26 +0000 (+0000)
Subject: added yyclass
X-Git-Tag: flex-2-5-5b~97
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6534e3e967a4478c79b3622140a55b0d1c27b1b8;p=flex

added yyclass
---

diff --git a/flexdef.h b/flexdef.h
index cc241a7..0ebff13 100644
--- a/flexdef.h
+++ b/flexdef.h
@@ -406,6 +406,7 @@ extern int yymore_really_used, reject_really_used;
  * outfilename - name of output file
  * did_outfilename - whether outfilename was explicitly set
  * prefix - the prefix used for externally visible names ("yy" by default)
+ * yyclass - yyFlexLexer subclass to use for YY_DECL
  * do_stdinit - whether to initialize yyin/yyout to stdin/stdout
  * use_stdout - the -t flag
  * input_files - array holding names of input files
@@ -428,7 +429,7 @@ extern const char *skel[];
 extern int skel_ind;
 extern char *infilename, *outfilename;
 extern int did_outfilename;
-extern char *prefix;
+extern char *prefix, *yyclass;
 extern int do_stdinit, use_stdout;
 extern char **input_files;
 extern int num_input_files;
diff --git a/main.c b/main.c
index 2a1902d..40bd769 100644
--- a/main.c
+++ b/main.c
@@ -66,7 +66,7 @@ char *action_array;
 int action_size, defs1_offset, prolog_offset, action_offset, action_index;
 char *infilename = NULL, *outfilename = NULL;
 int did_outfilename;
-char *prefix;
+char *prefix, *yyclass;
 int do_stdinit, use_stdout;
 int onestate[ONE_STACK_SIZE], onesym[ONE_STACK_SIZE];
 int onenext[ONE_STACK_SIZE], onedef[ONE_STACK_SIZE], onesp;
@@ -576,6 +576,7 @@ char **argv;
 	performance_report = 0;
 	did_outfilename = 0;
 	prefix = "yy";
+	yyclass = 0;
 	use_read = use_stdout = false;
 
 	sawcmpflag = false;
@@ -965,8 +966,22 @@ _( "Variable trailing context rules entail a large performance penalty\n" ) );
 		}
 
 	if ( C_plus_plus )
+		{
 		outn( "\n#include <FlexLexer.h>" );
 
+		if ( yyclass )
+			{
+			outn( "int yyFlexLexer::yylex()" );
+			outn( "\t{" );
+			outn(
+"\tLexerError( \"yyFlexLexer::yylex invoked but %option yyclass used\" );" );
+			outn( "\t}" );
+	
+			out_str( "\n#define YY_DECL int %s::yylex()\n",
+				yyclass );
+			}
+		}
+
 	else
 		{
 		if ( yytext_is_array )
@@ -977,6 +992,10 @@ _( "Variable trailing context rules entail a large performance penalty\n" ) );
 			outn( "extern char *yytext;" );
 			outn( "#define yytext_ptr yytext" );
 			}
+
+		if ( yyclass )
+			flexerror(
+		_( "%option yyclass only meaningful for C++ scanners" ) );
 		}
 
 	if ( useecs )
diff --git a/scan.l b/scan.l
index 748a0cb..2bff1b2 100644
--- a/scan.l
+++ b/scan.l
@@ -273,6 +273,7 @@ LEXOPT		[aceknopr]
 
 	outfile		return OPT_OUTFILE;
 	prefix		return OPT_PREFIX;
+	yyclass		return OPT_YYCLASS;
 
 	\"[^"\n]*\"	{
 			strcpy( nmstr, yytext + 1 );