feat(main): fazer pequeno passo de transpilação com uns extras

Author: BeyondMagic

src/main.c

@@ -0,0 +1,113 @@
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_LINE 1024
+
+static void transpile_stream(FILE *in);
+static void emit_line(char *line);
+static void trim_trailing(char *line);
+
+int main(int argc, char **argv)
+{
+	FILE *in = stdin;
+
+	if (argc > 2)
+	{
+		fprintf(stderr, "Uso: %s [arquivo.c]\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	if (argc == 2)
+	{
+		in = fopen(argv[1], "r");
+		if (!in)
+		{
+			fprintf(stderr, "Erro ao abrir %s: %s\n", argv[1], strerror(errno));
+			return EXIT_FAILURE;
+		}
+	}
+
+	transpile_stream(in);
+
+	if (in != stdin)
+	{
+		fclose(in);
+	}
+
+	return EXIT_SUCCESS;
+}
+
+static void transpile_stream(FILE *in)
+{
+	char buffer[MAX_LINE];
+
+	while (fgets(buffer, sizeof(buffer), in))
+	{
+		trim_trailing(buffer);
+		emit_line(buffer);
+	}
+}
+
+static void emit_line(char *line)
+{
+	char *cursor = line;
+
+	while (*cursor && isspace((unsigned char)*cursor))
+	{
+		cursor++;
+	}
+
+	if (*cursor == '\0')
+	{
+		return;
+	}
+
+	trim_trailing(cursor);
+
+	size_t len = strlen(cursor);
+	if (len == 0)
+	{
+		return;
+	}
+
+	if (cursor[len - 1] == ';')
+	{
+		cursor[len - 1] = '\0';
+		trim_trailing(cursor);
+	}
+
+	if (strncmp(cursor, "int ", 4) == 0)
+	{
+		char *rest = cursor + 4;
+		while (*rest && isspace((unsigned char)*rest))
+		{
+			rest++;
+		}
+		if (*rest == '\0')
+		{
+			return;
+		}
+		printf("local %s\n", rest);
+		return;
+	}
+
+	printf("%s\n", cursor);
+}
+
+static void trim_trailing(char *line)
+{
+	size_t len = strlen(line);
+
+	while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
+	{
+		line[--len] = '\0';
+	}
+
+	while (len > 0 && isspace((unsigned char)line[len - 1]))
+	{
+		line[--len] = '\0';
+	}
+}

src/parser.y

@@ -76,10 +76,6 @@ expr:
 
 %%
 
-int main(void) {
-    return yyparse();
-}
-
 void yyerror(const char *s) {
     fprintf(stderr, "Erro sintático: %s\n", s);
 }