move out the main function to a seperate file

1 files changed, 74 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..181dde2
--- /dev/null
+++ b/main.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <getopt.h>
+#include "cibic.tab.h"
+#include "ast.h"
+
+extern int yyparse();
+extern FILE *yyin;
+
+int yywrap() {
+    return 1;
+}
+
+int yyerror(char *s) {
+}
+
+void print_ast() {
+    yyparse();
+    if (ast_root)
+        cnode_debug_print(ast_root, 1);
+    else
+        fprintf(stderr, "Syntax Error\n");
+}
+
+void print_help() {
+}
+
+static struct option lopts[] = {
+    { "ast", no_argument, 0, 'a'},
+    { "help", no_argument, 0, 'h'},
+    {0, 0, 0, 0}
+};
+
+enum {
+    PRINT_AST,
+    PRINT_HELP
+} mode = PRINT_HELP;
+
+int main(int argc, char **argv) {
+    int option_index = 0, i;
+    while (1)
+    {
+        int c = getopt_long(argc, argv, "ah", lopts, &option_index);
+        if (c == -1)
+            break;
+        switch (c)
+        {
+            case 0: break;
+            case 'a': mode = PRINT_AST; break;
+            case 'h': mode = PRINT_HELP; break;
+        }
+    }
+    if (optind == argc - 1)
+    {
+        yyin = fopen(argv[argc - 1], "r");
+        if (!yyin)
+        {
+            fprintf(stderr, "Error while opening file.");
+            return 1;
+        }
+    }
+    else if (optind == argc)
+        yyin = stdin;
+    else
+    {
+        fprintf(stderr, "Only one source file is exepected.\n");
+        return 1;
+    }
+    switch (mode)
+    {
+        case PRINT_AST: print_ast(); break;
+        case PRINT_HELP: print_help(); break;
+    }
+    return 0;
+}