bool

commit f901bf766d5599930a55e9fbe766e8168ba4a2f4
parent b30dc248b357b4afd8055d55e704bf2447140d15
Author: thing1 <l.standen@posteo.com>
Date:   Wed, 15 Oct 2025 08:43:09 +0100

replaced the user input with a shell

Diffstat:
A
TODO.md
 | 
5
+++++
M
expr.c
 | 
54
++++++++++++++++++++++++++++++++++++++++--------------

2 files changed, 45 insertions(+), 14 deletions(-)
diff --git a/TODO.md b/TODO.md
@@ -0,0 +1,5 @@
+- make it so the lexer can lex an EOF, this should allow for both the input and shell to be from stdin
+- make a cleanup function that free's the tree
+- make a function that makes a truth table
+    - make a function that increments all the vals by looping through and making a carry
+- make a function that can take a tree and print it as algebra
diff --git a/expr.c b/expr.c
@@ -1,18 +1,19 @@
 #include <stdio.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
 #include "expr.h"
 
+#define SAME(s1, s2) (strcmp(s1, s2) == 0)
+
 extern FILE *yyin;
 extern void yyparse();
 extern btree *program;
 extern char vars[26];
 bool vals[26];
 
-void
-flush() {
-	while (getchar() != '\n') ;
-}
-
 bool
 eval(btree *p) {
 	bool l, r;
@@ -33,6 +34,19 @@ eval(btree *p) {
 	}
 }
 
+bool
+read_bool(char *s) {
+	if (s[1] != '\n') goto err;
+
+	switch (*s) {
+	case '0': return false;
+	case '1': return true;
+	}
+err:
+	fprintf(stderr, "expected 1 or 0\n");
+	return false;
+}
+
 int 
 main(int argc, char **argv) {
 	yyin = stdin;
@@ -45,17 +59,29 @@ main(int argc, char **argv) {
 
 	yyparse();
 
-	for (int i = 0; i < 26; i++) {
-		if (vars[i]) {
-			printf("%c = ", vars[i]);
-			scanf("%d", &vals[i]);
-			flush();
+	char line[128];
+	bool res = eval(program);
+
+	for (;;) {
+		printf("> ");
+		fgets(line, 128, stdin);
+		if (isupper(line[0])) {
+			vals[(int)line[0] - 65] = read_bool(line + 2);
+		}
+		else if (SAME(line, "s\n")) 
+			printf("res = %s\n", (res) ? "true" : "false");
+		else if (SAME(line, "q\n")) 
+			break;
+		else if (SAME(line, "p\n")) {
+			for (int i = 0; i < 26; i++) {
+				if (vars[i])
+					printf("%c = %s\n", vars[i], (vals[i]) ? "true" : "false");
+			}
 		}
+					
+		else
+			fprintf(stderr, "?\n");
 	}
-
-	bool res = eval(program);
-	
-	printf("res = %s\n", (res) ? "true" : "false");
 	
 	fclose(yyin);
 	return 0;