contains.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */
 
/**
 * @file contains.c
 * @brief Implements the OP_CONTAINS opcode for checking array membership in the VM.
 *
 * This file handles the OP_CONTAINS instruction, which checks if a value is present in an array.
 * The value and array are popped from the stack, and a boolean result (1/0) is pushed back.
 *
 * Behavior:
 * - Pops the value and array from the stack.
 * - Checks if the value is present in the array.
 * - Pushes 1 (true) or 0 (false) onto the stack.
 *
 * Error Handling:
 * - Exits with an error if the array is of the wrong type.
 *
 * Example:
 * - Bytecode: OP_CONTAINS
 * - Stack before: [20, [10, 20, 30]]
 * - Stack after: [1]
 */
 
case OP_CONTAINS: {
  Value needle = pop_value(vm);
  Value arr = pop_value(vm);
  if (arr.type != VAL_ARRAY) {
    fprintf(stderr, "Runtime type error: CONTAINS expects (array, value)\n");
    exit(1);
  }
  int ok = array_contains(&arr, &needle);
  free_value(arr);
  free_value(needle);
  push_value(vm, make_int(ok ? 1 : 0));
  break;
}