forked from KolibriOS/kolibrios
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/*
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* Tiny BASIC
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* Token Handling Header
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*
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* Copyright (C) Damian Walker 2019
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* Created: 15-Aug-2019
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*/
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#ifndef __TOKEN_H__
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#define __TOKEN_H__
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/*
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* Type Declarations
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*/
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/* token classes */
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typedef enum
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{
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TOKEN_NONE, /* no token has yet been identified */
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TOKEN_EOF, /* end of file */
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TOKEN_EOL, /* end of line */
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TOKEN_WORD, /* an identifier or keyword - token to be removed */
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TOKEN_NUMBER, /* a numeric constant */
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TOKEN_SYMBOL, /* a legal symbol - token to be removed */
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TOKEN_STRING, /* a string constant */
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TOKEN_LET, /* the LET keyword */
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TOKEN_IF, /* the IF keyword */
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TOKEN_THEN, /* the THEN keyword */
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TOKEN_GOTO, /* the GOTO keyword */
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TOKEN_GOSUB, /* the GOSUB keyword */
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TOKEN_RETURN, /* the RETURN keyword */
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TOKEN_END, /* the END keyword */
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TOKEN_PRINT, /* the PRINT keyword */
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TOKEN_INPUT, /* the INPUT keyword */
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TOKEN_REM, /* the REM keyword */
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TOKEN_VARIABLE, /* a single letter A..Z */
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TOKEN_PLUS, /* addition or unary positive */
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TOKEN_MINUS, /* subtraction or unary negative */
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TOKEN_MULTIPLY, /* multiplication */
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TOKEN_DIVIDE, /* division */
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TOKEN_LEFT_PARENTHESIS, /* open parenthesis */
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TOKEN_RIGHT_PARENTHESIS, /* close parenthesis */
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TOKEN_EQUAL, /* = */
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TOKEN_UNEQUAL, /* <> or >< */
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TOKEN_LESSTHAN, /* < */
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TOKEN_LESSOREQUAL, /* <= */
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TOKEN_GREATERTHAN, /* > */
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TOKEN_GREATEROREQUAL, /* >= */
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TOKEN_COMMA, /* comma separator */
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TOKEN_ILLEGAL /* unrecognised characters */
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} TokenClass;
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/* token structure */
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typedef struct token Token;
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typedef struct token
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{
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void *data; /* private data */
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TokenClass (*get_class) (Token *);
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int (*get_line) (Token *);
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int (*get_pos) (Token *);
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char *(*get_content) (Token *);
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void (*set_class) (Token *, TokenClass);
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void (*set_line_pos) (Token *, int, int);
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void (*set_content) (Token *, char *);
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void (*initialise) (Token *, TokenClass, int, int, char *);
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void (*destroy) (Token *); /* destructor */
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} Token;
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/*
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* Function Declarations
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*/
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/*
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* Token constructor without values to initialise
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* returns:
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* Token* the created token
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*/
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Token *new_Token (void);
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/*
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* Token constructor with values to initialise
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* params:
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* TokenClass class class of token to initialise
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* int line line on which the token occurred
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* int pos character position on which the token occurred
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* char* content the textual content of the token
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* returns:
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* Token* the created token
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*/
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Token *new_Token_init (TokenClass class, int line, int pos, char *content);
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#endif
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