Initial revision

1 files changed, 111 insertions, 0 deletions

diff --git a/Parser/pgenmain.c b/Parser/pgenmain.c
new file mode 100644
index 0000000..678be5d
--- /dev/null
+++ b/Parser/pgenmain.c
@@ -0,0 +1,111 @@
+/* Parser generator main program */
+
+#include <stdio.h>
+
+#include "PROTO.h"
+#include "grammar.h"
+#include "node.h"
+#include "parsetok.h"
+#include "pgen.h"
+
+int debugging;
+
+#ifdef THINK_C
+char *
+askfile()
+{
+	char buf[256];
+	static char name[256];
+	printf("Input file name: ");
+	if (fgets(buf, sizeof buf, stdin) == NULL) {
+		printf("EOF\n");
+		exit(1);
+	}
+	if (sscanf(buf, " %s ", name) != 1) {
+		printf("No file\n");
+		exit(1);
+	}
+	return name;
+}
+#endif
+
+grammar *
+getgrammar(filename)
+	char *filename;
+{
+	FILE *fp;
+	node *n;
+	grammar *g0, *g;
+	
+	fp = fopen(filename, "r");
+	if (fp == NULL) {
+		perror(filename);
+		exit(1);
+	}
+	g0 = meta_grammar();
+	n = NULL;
+	parsefile(fp, g0, g0->g_start, (char *)NULL, (char *)NULL, &n);
+	fclose(fp);
+	if (n == NULL) {
+		fprintf(stderr, "Parsing error.\n");
+		exit(1);
+	}
+	g = pgen(n);
+	if (g == NULL) {
+		printf("Bad grammar.\n");
+		exit(1);
+	}
+	return g;
+}
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	grammar *g;
+	node *n;
+	FILE *fp;
+	char *filename;
+	
+#ifdef THINK_C
+	filename = askfile();
+#else
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s grammar\n", argv[0]);
+		exit(2);
+	}
+	filename = argv[1];
+#endif
+	g = getgrammar(filename);
+	fp = fopen("graminit.c", "w");
+	if (fp == NULL) {
+		perror("graminit.c");
+		exit(1);
+	}
+	printf("Writing graminit.c ...\n");
+	printgrammar(g, fp);
+	fclose(fp);
+	fp = fopen("graminit.h", "w");
+	if (fp == NULL) {
+		perror("graminit.h");
+		exit(1);
+	}
+	printf("Writing graminit.h ...\n");
+	printnonterminals(g, fp);
+	fclose(fp);
+	exit(0);
+}
+
+void
+fatal(msg)
+	char *msg;
+{
+	fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
+	exit(1);
+}
+
+/*	TO DO:
+
+	- improve user interface
+	- check for duplicate definitions of names (instead of fatal err)
+*/