Housekeeping

src/modal.c

@@ -66,15 +66,13 @@ match(char *p, Rule *r)
 	return b;
 }
 
-static void
+static int
 bind(char r)
 {
 	int depth = 0;
 	char c, *s = regs[(int)r];
-	if(!s) {
-		printf("!! Reading from invalid register: ?%c\n", r);
-		return;
-	}
+	if(!s)
+		return !printf("!! Reading from invalid register: ?%c\n", r);
 	if(s[0] == '(') {
 		while((c = *s++)) {
 			if(c == '(') depth++;
@@ -85,7 +83,7 @@ bind(char r)
 	}
 	while(!spacer(s[0]) && (*outp_++ = *s++))
 		;
-	return;
+	return 1;
 }
 
 static void
@@ -98,6 +96,33 @@ save(int rule)
 	printf("%02d %s\n", rule, prog);
 }
 
+static char *
+parse_rulefrag(char *line)
+{
+	int depth = 0;
+	char c, *s = line, *res = dict_;
+	if(s[0] == '(') {
+		while((c = *s++)) {
+			if(c == '(') {
+				depth++;
+				if(depth == 1) continue;
+			}
+			if(c == ')') {
+				--depth;
+				if(!depth) {
+					*dict_++ = 0;
+					return res;
+				}
+			}
+			*dict_++ = c;
+		}
+	}
+	while(!spacer(s[0]) && (*dict_++ = *s++))
+		;
+	*dict_++ = 0;
+	return res;
+}
+
 static char *
 addrule(char *s)
 {
@@ -152,44 +177,45 @@ print_rules(void)
 	printf("\n");
 }
 
-static char *
-parse_rulefrag(char *line)
+static int
+parse_line(char *line)
 {
-	int depth = 0;
-	char c, *s = line, *res = dict_;
-	if(s[0] == '(') {
-		while((c = *s++)) {
-			if(c == '(') {
-				depth++;
-				if(depth == 1) continue;
-			}
-			if(c == ')') {
-				--depth;
-				if(!depth) {
-					*dict_++ = 0;
-					return res;
-				}
-			}
-			*dict_++ = c;
-		}
+	char c;
+	if(line[0] == 0) return 1;
+	if(line[0] == '<' && line[1] == '>')
+		return !!addrule(line);
+	while((c = *line++))
+		*prog_++ = c;
+	return 1;
+}
+
+static int
+parse(char *path)
+{
+	FILE *f;
+	char c, line[0x400], *line_ = line;
+	if(!(f = fopen(path, "r")))
+		return 0;
+	while(f && fread(&c, 1, 1, f)) {
+		if(c == 0xa)
+			*line_++ = 0x00, parse_line(line), line_ = line;
+		else if(line_ - line < 0x400)
+			*line_++ = c;
 	}
-	while(!spacer(s[0]) && (*dict_++ = *s++))
-		;
-	*dict_++ = 0;
-	return res;
+	*line_++ = 0x00, parse_line(line), line_ = line;
+	fclose(f);
+	return 1;
 }
 
 int
 main(int argc, char **argv)
 {
-	FILE *f;
 	if(argc < 2)
 		return !printf("usage: modal [-v] source.modal\n");
 	if(argc < 3 && argv[1][0] == '-' && argv[1][1] == 'v')
 		return !printf("Modal - Modal Interpreter, 4 Apr 2024.\n");
-	if(!(f = fopen(argv[1], "r")))
-		return !printf("Invalid file: %s\n", argv[1]);
-	fread(&prog, 1, 0x1000, f), fclose(f);
+	if(!parse(argv[1]))
+		return !printf("Invalid Modal file: %s.\n", argv[1]);
 	print_rules();
 	printf(".. %s\n", prog);
 	while(rewrite())