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