70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
#ifndef LEX_H
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#define LEX_H
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#include "error_buffer.h"
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#define LEX_DEBUG
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enum token_type {
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TOK_EOF,
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TOK_ERROR,
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TOK_NUMBER,
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TOK_PLUS,
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TOK_MINUS,
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TOK_MULTIPLY,
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TOK_DIVIDE,
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TOK_POWER,
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TOK_X,
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TOK_FUNCTION,
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TOK_LEFT_PAREN,
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TOK_RIGHT_PAREN
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};
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enum math_fn {
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FN_ABS,
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FN_EXP,
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FN_LN,
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FN_LOG,
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FN_SIN,
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FN_COS,
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FN_TAN,
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FN_ASIN,
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FN_ACOS,
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FN_ATAN,
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FN_SINH,
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FN_COSH,
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FN_TANH
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};
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struct token {
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enum token_type type;
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union token_val {
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double num;
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enum math_fn fn;
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} val;
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};
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struct lexer {
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const char *start;
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const char *prev_p;
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const char *p;
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struct token tok;
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struct error_buffer eb;
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};
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void lex_init(struct lexer *lex, const char *str);
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void lex_next(struct lexer *lex);
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struct token *lex_token(struct lexer *lex);
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void lex_print_position(const struct lexer *lex, struct error_buffer *eb);
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enum error_code lex_get_error(const struct lexer *lex);
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const char *lex_get_error_text(const struct lexer *lex);
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#ifdef LEX_DEBUG
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void lex_debug_print_token(const struct token *tok);
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#endif /* LEX_DEBUG */
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#endif /* LEX_H */ |