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step: deal with parenthesis

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NunoSempere 2023-04-30 11:47:53 -04:00
parent 015ee9595f
commit 495418dadc
2 changed files with 13 additions and 7 deletions
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src/mumble.c
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@ -23,6 +23,11 @@ long evaluate_operation(char* op, long x, long y)
return 0; return 0;
} }
int is_ignorable(mpc_ast_t* t){
int is_regex = !strcmp(t->tag, "regex");
int is_parenthesis = !strcmp(t->tag, "char") && !strcmp(t->contents, "(");
return is_regex || is_parenthesis;
}
long evaluate_ast(mpc_ast_t* t) long evaluate_ast(mpc_ast_t* t)
{ {
// Base case #1: It's a number // Base case #1: It's a number
@ -41,24 +46,25 @@ long evaluate_ast(mpc_ast_t* t)
printf("\nCase #2, %s", t->children[0]->contents); printf("\nCase #2, %s", t->children[0]->contents);
return atoi(t->children[0]->contents); return atoi(t->children[0]->contents);
} }
// Base case #3: Top level parenthesis
// Case #3: Parenthesis case if (t->children_num == 2 && strstr(t->children[0]->tag, "expr|>") && !strcmp(t->children[1]->tag, "regex")) {
if (VERBOSE)
if (t->children_num == 2 && !strcmp(t->children[0]->tag, "expr|>") && strstr(t->children[1]->tag, "regex")) { printf("\nCase #3, top level parenthesis");
return evaluate_ast(t->children[0]); return evaluate_ast(t->children[0]);
} }
// Case #4: Unary operations case
// Case #4: Unary operations case
// Case #5: Binary (or more) operations case // Case #5: Binary (or more) operations case
long x; long x;
char* operation; char* operation;
if (t->children_num > 3 && !strcmp(t->children[0]->tag, "regex") && strstr(t->children[1]->tag, "operator")) { if (t->children_num > 3 && is_ignorable(t->children[0]) && strstr(t->children[1]->tag, "operator")) {
operation = t->children[1]->contents; operation = t->children[1]->contents;
if (VERBOSE) if (VERBOSE)
printf("\nCase #5, %s", operation); printf("\nCase #5, %s", operation);
x = evaluate_ast(t->children[2]); x = evaluate_ast(t->children[2]);
int i = 3; int i = 3;
while ((i < t->children_num) && strstr(t->children[i]->tag, "expr")) { while ((i < t->children_num) && strstr(t->children[i]->tag, "expr")) {
// note that when reaching a closing parenthesis, ^ returns false
long y = evaluate_ast(t->children[i]); long y = evaluate_ast(t->children[i]);
x = evaluate_operation(operation, x, y); x = evaluate_operation(operation, x, y);
i++; i++;