add simple command+option compiler

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13969 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/sl/slc-lex.l

@@ -0,0 +1,156 @@
+%{
+/*
+ * Copyright (c) 2004 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+/* $Id$ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include "slc.h"
+#include "slc-gram.h"
+unsigned lineno = 1;
+
+static void handle_comment(void);
+static char * handle_string(void);
+%}
+%%
+[A-Za-z][-A-Za-z0-9_]*	{
+			  yylval.string = strdup ((const char *)yytext);
+			  return LITERAL;
+			}
+"\""			{ yylval.string = handle_string(); return STRING; }
+\n			{ ++lineno; }
+\/\*			{ handle_comment(); }
+[={}]			{ return *yytext; }
+[ \t]			;
+%%
+
+void
+error_message (const char *format, ...)
+{
+     va_list args;
+
+     va_start (args, format);
+     fprintf (stderr, "%s:%d: ", filename, lineno);
+     vfprintf (stderr, format, args);
+     va_end (args);
+     error_flag++;
+}
+
+void
+yyerror (char *s)
+{
+    error_message("%s\n", s);
+}
+
+static void
+handle_comment(void)
+{
+    int c;
+    int start_lineno = lineno;
+    int level = 1;
+    int seen_star = 0;
+    int seen_slash = 0;
+    while((c = input()) != EOF) {
+	if(c == '/') {
+	    if(seen_star) {
+		if(--level == 0)
+		    return;
+		seen_star = 0;
+		continue;
+	    }
+	    seen_slash = 1;
+	    continue;
+	}
+	if(seen_star && c == '/') {
+	    if(--level == 0)
+		return;
+	    seen_star = 0;
+	    continue;
+	}
+	if(c == '*') {
+	    if(seen_slash) {
+		level++;
+		seen_star = seen_slash = 0;
+		continue;
+	    } 
+	    seen_star = 1;
+	    continue;
+	}
+	seen_star = seen_slash = 0;
+	if(c == '\n') {
+	    lineno++;
+	    continue;
+	}
+    }
+    if(c == EOF)
+	error_message("unterminated comment, possibly started on line %d\n", start_lineno);
+}
+
+static char *
+handle_string(void)
+{
+    char x[1024];
+    int i = 0;
+    int c;
+    int quote = 0;
+    while((c = input()) != EOF){
+	if(quote) {
+	    x[i++] = '\\';
+	    x[i++] = c;
+	    quote = 0;
+	    continue;
+	}
+	if(c == '\n'){
+	    error_message("unterminated string");
+	    lineno++;
+	    break;
+	}
+	if(c == '\\'){
+	    quote++;
+	    continue;
+	}
+	if(c == '\"')
+	    break;
+	x[i++] = c;
+    }
+    x[i] = '\0';
+    return strdup(x);
+}
+
+int
+yywrap () 
+{
+     return 1;
+}