41 lines
1010 B
C
41 lines
1010 B
C
#ifndef __LEXER_H__
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#define __LEXER_H__
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#include "token.h"
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#define LEXER_MAX_TOKEN_SIZE 63
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#define LEXER_BUFFER_SIZE 4095
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typedef int (*lexer_sread_fn)(void *dst_buf, int dst_size,
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int elem_size, int count, void *stream);
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struct Lexer {
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int line;
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int index;
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// const char current_file_name[LEXER_BUFFER_SIZE+1];
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unsigned char* cur_ptr; // 当前扫描的字符，但是还没有开始扫描
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unsigned char* end_ptr; // 缓冲区最后一个字符的下一个位置
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char buffer[LEXER_BUFFER_SIZE+1];
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lexer_sread_fn sread;
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void* stream;
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};
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struct Token {
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enum TokenType type;
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struct TokenConstant constant;
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};
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void init_lexer(struct Lexer* lexer, const char* file_name, void* stream,
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lexer_sread_fn sread);
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//
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void get_token(struct Lexer* lexer, struct Token* token);
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// get_token maybe got invalid (with parser as TOKEN_FLUSH)
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void get_valid_token(struct Lexer* lexer, struct Token* token);
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const char* get_token_name(enum TokenType token);
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#endif
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