#include <core_type.h>

typedef struct lexer_stream lexer_stream_t;

#define lexer_stream_eof (-1)

struct lexer_stream {
    const char* name;
    usize name_len;

    /// @brief 读取指定数量的字符到缓冲区
    usize (*read_buf)(lexer_stream_t* stream, char* buffer, usize count);

    /// @brief 获取下一个字符
    int (*peek_char)(lexer_stream_t* stream);

    /// @brief 重置字符流位置
    void (*reset_char) (lexer_stream_t* stream);

    /// @brief 读取并消费下一个字符（移动流位置）
    int (*next_char)(lexer_stream_t* stream);

    /// @brief 释放资源
    void (*free_stream) (lexer_stream_t* steam);
};

#ifndef __SMCC_LEXER_NO_MEM_STREAM__
typedef struct lexer_mem_stream {
    lexer_stream_t stream;
    const char* data;
    usize data_length;
    usize curr_pos;
    usize peek_pos;
    cbool owned;
} lexer_mem_stream_t;
lexer_stream_t* lexer_mem_stream_init(lexer_mem_stream_t* stream, const char* data, usize length, cbool need_copy);
#endif