The Lemon program is an LALR(1) parser generator. It takes a context

free grammar  and converts it into  a subroutine that will  parse a file
using that grammar.

Lemon is  similar to the much  more famous programs "YACC"  and "BISON".
But lemon is not compatible with either yacc or bison. There are several
important differences:

	. Lemon using a different grammar  syntax which is less prone to
	  programming errors.

	. Lemon generates a parser that is faster than Yacc or Bison
	  parsers (according to the author).

	. The parser generated by Lemon is both re-entrant and thread-safe.

	. Lemon includes the concept of a non-terminal destructor, which
	  makes  it much  easier  to write  a parser  that  does not
	  leak memory.

WWW: http://www.hwaci.com/sw/lemon/

6 files changed, 159 insertions, 0 deletions

diff --git a/devel/lemon/Makefile b/devel/lemon/Makefile
new file mode 100644
index 000000000000..b356ade89c08
--- /dev/null
+++ b/devel/lemon/Makefile
@@ -0,0 +1,32 @@
+# Ports collection makefile for:  lemon
+# Date created:			  June 4, 2001
+# Whom:				  Mikhail Teterin
+#
+# $FreeBSD$
+#
+
+PORTNAME=	lemon
+PORTVERSION=	1.0
+CATEGORIES=	devel
+MASTER_SITES=	http://www.hwaci.com/sw/lemon/
+DISTFILES=	lemon.c lempar.c
+
+MAINTAINER=	mi@aldan.algebra.com
+
+NO_WRKSUBDIR=	YES
+
+do-extract:
+	${MKDIR} ${WRKSRC}
+	${CP} -p ${DISTDIR}/lemon.c ${WRKSRC}
+
+do-build:
+	cd ${WRKSRC} && ${MAKE} VPATH=${DISTDIR} PROG=lemon NOMAN=1 \
+		CFLAGS="${CFLAGS} -DLEMPAR='\"${PREFIX}/share/lemon/lempar.c\"'" \
+			-f bsd.prog.mk
+
+do-install:
+	${INSTALL_PROGRAM} ${WRKDIR}/${PORTNAME} ${PREFIX}/bin/
+	${MKDIR} ${PREFIX}/share/lemon
+	${INSTALL_DATA} ${DISTDIR}/lempar.c ${PREFIX}/share/lemon/
+
+.include <bsd.port.mk>
diff --git a/devel/lemon/distinfo b/devel/lemon/distinfo
new file mode 100644
index 000000000000..abee70b45ac7
--- /dev/null
+++ b/devel/lemon/distinfo
@@ -0,0 +1,2 @@
+MD5 (lemon.c) = 926bc7eb6e5ee8f02e919cc0fe2febd6
+MD5 (lempar.c) = 19c9e510be0b6bde25f945aecc79a97b
diff --git a/devel/lemon/files/patch-aa b/devel/lemon/files/patch-aa
new file mode 100644
index 000000000000..663a90cf1cb2
--- /dev/null
+++ b/devel/lemon/files/patch-aa
@@ -0,0 +1,100 @@
+--- /usr/ports/distfiles/lemon.c	Tue Dec  5 20:52:24 2000
++++ ./lemon.c	Mon Jun  4 23:35:15 2001
+@@ -31,2 +31,5 @@
+ #include <ctype.h>
++#include <unistd.h>
++#include <stdlib.h>
++#include <sys/param.h>
+ 
+@@ -35,4 +38,2 @@
+ extern long strtol();
+-extern void free();
+-extern int access();
+ extern int atoi();
+@@ -55,3 +56,2 @@
+ char *msort();
+-extern void *malloc();
+ 
+@@ -2525,45 +2525,13 @@
+ 
+-/* Search for the file "name" which is in the same directory as
+-** the exacutable */
+-PRIVATE char *pathsearch(argv0,name,modemask)
+-char *argv0;
+-char *name;
+-int modemask;
++PRIVATE const char *pathsearch()
+ {
+-  char *pathlist;
+-  char *path,*cp;
+-  char c;
+-  extern int access();
++  const char *path;
+ 
+-#ifdef __WIN32__
+-  cp = strrchr(argv0,'\\');
+-#else
+-  cp = strrchr(argv0,'/');
+-#endif
+-  if( cp ){
+-    c = *cp;
+-    *cp = 0;
+-    path = (char *)malloc( strlen(argv0) + strlen(name) + 2 );
+-    if( path ) sprintf(path,"%s/%s",argv0,name);
+-    *cp = c;
+-  }else{
+-    extern char *getenv();
+-    pathlist = getenv("PATH");
+-    if( pathlist==0 ) pathlist = ".:/bin:/usr/bin";
+-    path = (char *)malloc( strlen(pathlist)+strlen(name)+2 );
+-    if( path!=0 ){
+-      while( *pathlist ){
+-        cp = strchr(pathlist,':');
+-        if( cp==0 ) cp = &pathlist[strlen(pathlist)];
+-        c = *cp;
+-        *cp = 0;
+-        sprintf(path,"%s/%s",pathlist,name);
+-        *cp = c;
+-        if( c==0 ) pathlist = "";
+-        else pathlist = &cp[1];
+-        if( access(path,modemask)==0 ) break;
+-      }
+-    }
+-  }
+-  return path;
++  path = getenv("LEMPAR");
++
++  if (path)
++    if (access(path, R_OK)) perror(path);
++    else return(path);
++
++  return(LEMPAR);
+ }
+@@ -2631,6 +2599,5 @@
+ {
+-  static char templatename[] = "lempar.c";
+-  char buf[1000];
++  char buf[MAXPATHLEN];
+   FILE *in;
+-  char *tpltname;
++  const char *tpltname;
+   char *cp;
+@@ -2643,10 +2610,9 @@
+   }
+-  if( access(buf,004)==0 ){
++  if( access(buf, R_OK)==0 ){
+     tpltname = buf;
+   }else{
+-    tpltname = pathsearch(lemp->argv0,templatename,0);
++    tpltname = pathsearch();
+   }
+   if( tpltname==0 ){
+-    fprintf(stderr,"Can't find the parser driver template file \"%s\".\n",
+-    templatename);
++    fprintf(stderr,"Can't find the parser driver template file.\n");
+     lemp->errorcnt++;
+@@ -2656,3 +2622,3 @@
+   if( in==0 ){
+-    fprintf(stderr,"Can't open the template file \"%s\".\n",templatename);
++    fprintf(stderr,"Can't open the template file \"%s\".\n", tpltname);
+     lemp->errorcnt++;
diff --git a/devel/lemon/pkg-comment b/devel/lemon/pkg-comment
new file mode 100644
index 000000000000..0a3855e1139d
--- /dev/null
+++ b/devel/lemon/pkg-comment
@@ -0,0 +1 @@
+An LALR(1) parser generator. Similar in function to yacc and bison
diff --git a/devel/lemon/pkg-descr b/devel/lemon/pkg-descr
new file mode 100644
index 000000000000..4025df838fec
--- /dev/null
+++ b/devel/lemon/pkg-descr
@@ -0,0 +1,21 @@
+The Lemon  program is an  LALR(1) parser  generator. It takes  a context
+free grammar  and converts it into  a subroutine that will  parse a file
+using that grammar.
+
+Lemon is  similar to the much  more famous programs "YACC"  and "BISON".
+But lemon is not compatible with either yacc or bison. There are several
+important differences:
+
+	. Lemon using a different grammar  syntax which is less prone to
+	  programming errors.
+
+	. Lemon generates a parser that is faster than Yacc or Bison
+	  parsers (according to the author).
+
+	. The parser generated by Lemon is both re-entrant and thread-safe.
+
+	. Lemon includes the concept of a non-terminal destructor, which
+	  makes  it much  easier  to write  a parser  that  does not
+	  leak memory.
+
+WWW: http://www.hwaci.com/sw/lemon/
diff --git a/devel/lemon/pkg-plist b/devel/lemon/pkg-plist
new file mode 100644
index 000000000000..3dc10ef91982
--- /dev/null
+++ b/devel/lemon/pkg-plist
@@ -0,0 +1,3 @@
+bin/lemon
+share/lemon/lempar.c
+@dirrm share/lemon