brozek/SLOTH
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Cosmetics

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This commit is contained in:
Brandon Rozek 2018-09-18 23:22:44 -04:00
parent 61301aaa97
commit b2995e2475
1 changed files with 9 additions and 3 deletions
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12
src/parser.y
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@ -212,8 +212,6 @@ void attach_node(struct Node* parent, struct Node* child) {
}
void print_tree(struct Node* node, int tabs) {
int i;
/* base case */
if(!node) {
fprintf(stderr, "NO TREE STRUCTURE\n");
@ -221,7 +219,7 @@ void print_tree(struct Node* node, int tabs) {
}
/* print leading tabs */
for(i = 0; i < tabs; i++) {
for(int i = 0; i < tabs; i++) {
printf(" ");
}
@ -265,6 +263,7 @@ void delete_tree(struct Node* node) {
}
free(node);
}
/* creates a new variable and returns it */
struct Variable* make_variable(char* id, double value) {
/* allocate space */
@ -282,6 +281,7 @@ void set_value(struct Variable* var, double value) {
if (!var) { fprintf(stderr, "Error: Invalid Variable\n"); return; }
var->value = value;
}
double get_value(struct Variable* var) {
if (!var) { fprintf(stderr, "Error: Invalid Variable\n"); return 0; }
return var->value;
@ -295,6 +295,7 @@ struct Environment* create_environment(void) {
}
return env;
}
struct Variable* find_variable(struct Environment* env, char* id) {
for (int i = 0; i < env->num_vars; i++) {
if (strcmp(env->vars[i]->id, id) == 0) {
@ -466,6 +467,7 @@ void eval_statement(struct Node* node, struct Environment* env) {
make_variable(node->children[0]->id,
eval_expression(node->children[1], env)));
break;
//------------
case IF:
if (node->num_children != 2 && node->num_children != 3) {
fprintf(stderr, "Error: The format of an if-statement is if expression statement with an optional else.\n");
@ -476,16 +478,19 @@ void eval_statement(struct Node* node, struct Environment* env) {
eval_statement(node->children[2], env);
}
break;
//------------
case WHILE:
check_num_nodes(node, 2, "the format of a while statement is: while expression statement(s)");
while (eval_expression(node->children[0], env)) {
eval_statement(node->children[1], env);
}
break;
//------------
case PRINT:
check_num_nodes(node, 1, "can only print out one expression at a time.");
printf("%lf\n", eval_expression(node->children[0], env));
break;
//------------
case STATEMENT: // Can have a maximum of two children statement nodes
if (node->num_children > 0) {
eval_statement(node->children[0], env);
@ -494,6 +499,7 @@ void eval_statement(struct Node* node, struct Environment* env) {
eval_statement(node->children[1], env);
}
break;
//------------
default:
printf("Error, %d not a valid statement type.\n", node->type);
return;