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/*
* Copyright (C) 2023 Carlos Maniero
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "scope.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
static scope_item_t *
scope_item_new(void)
{
scope_item_t *item = malloc(sizeof(scope_item_t));
if (item == NULL) {
fprintf(stderr, "failed to create scope item: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
return item;
}
static void
scope_item_destroy(scope_item_t *item)
{
free(item);
}
scope_t *
scope_new(void)
{
scope_t *scope = malloc(sizeof(scope_t));
if (scope == NULL) {
fprintf(stderr, "failed to create scope: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
scope->stack = vector_new();
scope_enter(scope);
return scope;
}
void
scope_destroy(scope_t *scope)
{
if (scope->stack->size) {
fprintf(stderr,
"Stack not cleaned before destroying. This may lead to memory leaks.\n"
"Please make sure to call the leave function before destroying it.");
}
for (size_t i = 0; i < scope->stack->size; i++) {
vector_destroy(vector_at(scope->stack, i));
}
vector_destroy(scope->stack);
free(scope);
}
void
scope_enter(scope_t *scope)
{
vector_push_back(scope->stack, vector_new());
}
void
scope_leave(scope_t *scope)
{
// FIXME: create a stack data structure to simplify this logic
vector_t *new_stack = vector_new();
for (size_t i = 0; i < scope->stack->size - 1; i++) {
vector_push_back(new_stack, vector_at(scope->stack, i));
}
vector_t *current_level = vector_at(scope->stack, scope->stack->size - 1);
for (size_t i = 0; i < current_level->size; i++) {
scope_item_destroy(vector_at(current_level, i));
}
vector_destroy(current_level);
vector_t *old_stack = scope->stack;
vector_destroy(old_stack);
scope->stack = new_stack;
}
ast_node_t *
scope_get(scope_t *scope, ast_identifier_t *identifier)
{
for (size_t i = scope->stack->size; i > 0; i--) {
vector_t *current_level = vector_at(scope->stack, i - 1);
for (size_t j = 0; j < current_level->size; j++) {
scope_item_t *item = vector_at(current_level, j);
if (string_view_eq(identifier->name, item->identifier->name)) {
return item->node;
}
}
}
return NULL;
}
void
scope_push(scope_t *scope, ast_identifier_t *identifier, ast_node_t *node)
{
vector_t *current_level = vector_at(scope->stack, scope->stack->size - 1);
scope_item_t *item = scope_item_new();
*item = (scope_item_t){ .identifier = identifier, .node = node };
vector_push_back(current_level, item);
}
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