lalr now acutally works

1 files changed, 25 insertions, 5 deletions

diff --git a/demos/sample-files/parser-skeleton.c b/demos/sample-files/parser-skeleton.c
index facbc1b..031d829 100644
--- a/demos/sample-files/parser-skeleton.c
+++ b/demos/sample-files/parser-skeleton.c
@@ -18,13 +18,33 @@ enum symbol {
     SYMBOLS_END,
 };
 
-static symbol toklist[] = {N0, PLUS, N1, END_INPUT};
-static symbol *tok = toklist;
+static inline symbol char_to_token(char c)
+{
+    switch(c) {
+    case '+': return PLUS;
+    case '-': return MINUS;
+    case '(': return LPAREN;
+    case ')': return RPAREN;
+    case '0': return N0;
+    case '1': return N1;
+    case  0 : return END_INPUT;
+    default: fprintf(stderr, "ERROR: Unknown character '%c'\n", c); exit(1);
+    }
+}
 
-symbol toklist_eat() { return *(tok++); } // unsafe
-symbol toklist_peek() { return *tok; }    // unsafe
+static char *input;
 
-int main(void)
+symbol toklist_eat() { return char_to_token(*(input++)); } // unsafe
+symbol toklist_peek() { return char_to_token(*input); }    // unsafe
+
+int main(int argc, char **argv)
 {
+    if(argc != 2) {
+        fprintf(stderr, "ERROR: Not enough arguments\n");
+        return 1;   
+    }
+
+    input = argv[1];
+    
     return lr_parser();
 }