#ifndef AST_EXPRESSION_H
#define AST_EXPRESSION_H

#include "../bool.h"

typedef enum {
    EXPRESSION_TREE_INTEGER,
    EXPRESSION_TREE_STRING,
    EXPRESSION_TREE_BOOLEAN
} ExpressionTreeTag;

typedef struct {
    ExpressionTreeTag tag;
    union {
        int integer;
        const char* string;
        bool boolean;
    };
} ExpressionTree;

typedef enum {
    TYPE_TREE_BUILTIN,
    TYPE_TREE_ARRAY
} TypeTreeTag;

/**
 * An expression that evaluates to a type.
 */
typedef struct TypeTree TypeTree;
struct TypeTree {
    /** @brief defines which entry in the union is valid */
    TypeTreeTag tag;
    union {
        /** @brief Evaluates to an array of the given type. */
        struct {
            /** @brief A pointer to the type of the elements stored in the array. */
            TypeTree* array;
        } array;
        /** @brief Evaluates to a builtin integer type.*/
        struct {
            /**
             * @brief The number of bits in the integer.
             * Typical values are 8, 16, 32, and 64.
             */
            int bitSize;
            /** @brief `true` if the type is signed, `false` if it's unsigned. */
            bool isSigned;
        } builtin;
    };
};

#endif