65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
#ifndef LIBABACUS_LEXER_H
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#define LIBABACUS_LEXER_H
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#include "eval.h"
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#include "libabacus.h"
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/**
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* The lexer used for reading
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* a string and converting it into
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* tokens.
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*/
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struct lexer {
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/**
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* The liblex configuration used
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* to convert the string into tokens.
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*/
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eval_config config;
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};
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/**
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* The various tokens used by the lexer
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* in order to tag meaningful sequences
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* of characters.
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*/
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enum lexer_token {
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TOKEN_CHAR = 0,
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TOKEN_ID,
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TOKEN_TRUE,
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TOKEN_FALSE,
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TOKEN_NUM,
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TOKEN_STR,
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TOKEN_CHAR_LIT,
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TOKEN_KW_FUN,
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TOKEN_KW_IF,
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TOKEN_KW_ELSE,
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TOKEN_KW_WHILE,
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TOKEN_KW_DO,
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TOKEN_KW_FOR,
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TOKEN_KW_RETURN,
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TOKEN_OP_INFIX,
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TOKEN_OP_POSTFIX,
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TOKEN_OP_PREFIX,
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TOKEN_LAST
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};
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typedef struct lexer lexer;
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typedef enum lexer_token lexer_token;
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/**
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* Initializes the given lexer,
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* placing the default tokens into it.
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* @param lexer the lexer to intiailize.
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* @return the result of the operation (can be MALLOC on failed allocation.)
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*/
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libab_result lexer_init(lexer* lexer);
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/**
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* Releases the memory associated with the given lexer,
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* removing all registered patterns from it.
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* @param lexer the lexer to free.
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* @return the result of the operation.
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*/
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libab_result lexer_free(lexer* lexer);
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#endif
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