#ifndef L_LANG_H
#define L_LANG_H

#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>

// === 类型系统 ===
typedef enum {
    TYPE_I64,
    TYPE_F64,
    TYPE_BOOL,
    TYPE_STR,
    TYPE_VOID,
    TYPE_STRUCT,    // 结构体类型
    TYPE_UNKNOWN,   // 尚未推断
    TYPE_ERROR,     // 类型错误
} TypeKind;

static inline const char* type_name(TypeKind kind) {
    switch (kind) {
        case TYPE_I64:  return "i64";
        case TYPE_F64:  return "f64";
        case TYPE_BOOL: return "bool";
        case TYPE_STR:  return "str";
        case TYPE_VOID:   return "void";
        case TYPE_STRUCT: return "struct";
        default:          return "<unknown>";
    }
}

// === 源码位置（替代分散的 line/col 参数）===
typedef struct {
    int line;
    int col;
} SourceLoc;

// 手动创建 SourceLoc
static inline SourceLoc loc_at(int line, int col) {
    return (SourceLoc){ .line = line, .col = col };
}

// === 向前声明 ===
typedef struct Token Token;
typedef struct AstNode AstNode;
typedef struct Scope Scope;
typedef struct Arena Arena;

// === 跨模块分配器接口（避免循环依赖，各模块通过 void* 使用 arena）===
void* arena_alloc_impl(void* alloc, size_t size);
char* arena_strdup_impl(void* alloc, const char* src, size_t len);

#endif