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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "tree.h"
int strichar(const char *str, char c){
for(int i=0; str[i]!='\0';i++){
if(str[i] == c) return i;
}
return -1; //char not found
}
const char ops[] = {'+','*','!'}; //ordem inversa
const int opsize = sizeof(ops)/sizeof(char);
node * parse(char *str) { //expects a string with no whitespace
int j,i;
for(i=0; i<opsize; i++){
j=strichar(str,ops[i]);
if(j>=0) break;
}
node *this = (node *)malloc(sizeof(node));
if(j<0) {
this->type = LTTR;
this->el = str[0];
}
else{
this->el = ops[i];
if(i==2) {
this->type = UNOP;
this->child[0] = parse(str+j+1);
}
else {
str[j] = '\0';
this->type = BIOP;
this->child[0] = parse(str);
this->child[1] = parse(str+j+1);
}
}
return this;
}
void fprintTree(FILE *stream, node *root, int level) {
if (root == NULL)
return;
if (level) {
for (int i = 1; i < level; i++) {
fprintf(stream, "│ ");
}
fprintf(stream, "├─ ");
}
fprintf(stream, "%c\n", root->el);
for (int i = 0; i < 2; i++) {
if (root->child[i] != NULL) {
fprintTree(stream, root->child[i], level + 1);
}
}
}
void printTree(node *root, int level) {
fprintTree(stdout, root, level);
}
void free_node(node *n) {
if (n->lhs) free_node(n->lhs);
if (n->rhs) free_node(n->rhs);
free(n);
}
char eval_tree(node *root, uint32_t alph_bools) {
switch (root->type) {
case BIOP: {
char lhs = eval_tree(root->lhs, alph_bools);
char rhs = eval_tree(root->rhs, alph_bools);
switch (root->el) {
case '+': return lhs || rhs;
case '*': return lhs && rhs;
default: fprintf(stderr, "%s: unknown binary operation \"%c\"\n", __func__, root->el);
}
}
case UNOP: {
// We only have the not, FIXME if more are added
return !eval_tree(root->value, alph_bools);
}
case LTTR: {
char alph_pos = root->el - 'a';
return (alph_bools & (1 << alph_pos)) > 0;
}
}
}
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