basic.h

#ifndef _BASIC_H
#define _BASIC_H

#include <stdint.h>

#define TOKEN_EOL       0
#define TOKEN_IDENT     1   // special case - identifier follows
#define TOKEN_INTEGER   2   // special case - integer follows (line numbers only)
#define TOKEN_NUMBER    3   // special case - number follows
#define TOKEN_STRING    4   // special case - string follows

#define TOKEN_LBRACKET  8
#define TOKEN_RBRACKET  9
#define TOKEN_PLUS      10
#define TOKEN_MINUS     11
#define TOKEN_MULT      12
#define TOKEN_DIV       13
#define TOKEN_EQUALS    14
#define TOKEN_GT        15
#define TOKEN_LT        16
#define TOKEN_NOT_EQ    17
#define TOKEN_GT_EQ     18
#define TOKEN_LT_EQ     19
#define TOKEN_CMD_SEP   20
#define TOKEN_SEMICOLON 21
#define TOKEN_COMMA     22
#define TOKEN_AND       23  // FIRST_IDENT_TOKEN
#define TOKEN_OR        24
#define TOKEN_NOT       25
#define TOKEN_PRINT     26
#define TOKEN_LET       27
#define TOKEN_LIST      28
#define TOKEN_RUN       29
#define TOKEN_GOTO      30
#define TOKEN_REM       31
#define TOKEN_STOP      32
#define TOKEN_INPUT     33
#define TOKEN_CONT      34
#define TOKEN_IF        35
#define TOKEN_THEN      36
#define TOKEN_LEN       37
#define TOKEN_VAL       38
#define TOKEN_RND       39
#define TOKEN_INT       40
#define TOKEN_STR       41
#define TOKEN_FOR       42
#define TOKEN_TO        43
#define TOKEN_STEP      44

#define TOKEN_NEXT      45
#define TOKEN_MOD       46
#define TOKEN_NEW       47
#define TOKEN_GOSUB     48
#define TOKEN_RETURN    49
#define TOKEN_DIM       50
#define TOKEN_LEFT      51
#define TOKEN_RIGHT     52
#define TOKEN_MID       53
#define TOKEN_CLS       54
#define TOKEN_PAUSE     55
#define TOKEN_POSITION  56
#define TOKEN_PIN       57
#define TOKEN_PINMODE   58
#define TOKEN_INKEY     59
#define TOKEN_SAVE      60
#define TOKEN_LOAD      61
#define TOKEN_PINREAD   62
#define TOKEN_ANALOGRD  63
#define TOKEN_DIR       64
#define TOKEN_DELETE    65
//   fdufnews 2019/12
//   added ASC(string)
//   added SLEEP
#define TOKEN_ASC       66
#define TOKEN_SLEEP     67
//   fdufnews 2020/07
#define TOKEN_TONE      68
#define TOKEN_NOTONE    69
// fdufnews 2020/08/06
#define TOKEN_MOUNT     70
#define TOKEN_UNMOUNT   71
// fdufnews 2021/04/01
#define TOKEN_HELP      72

// fdufnews 2021/07/22
#define TOKEN_PEEK      73
#define TOKEN_POKE      74


#define FIRST_IDENT_TOKEN 23
#define LAST_IDENT_TOKEN 74

#define FIRST_NON_ALPHA_TOKEN           8
#define LAST_NON_ALPHA_TOKEN            22

#define ERROR_NONE                      0
// parse errors
#define ERROR_LEXER_BAD_NUM             1
#define ERROR_LEXER_TOO_LONG            2
#define ERROR_LEXER_UNEXPECTED_INPUT    3
#define ERROR_LEXER_UNTERMINATED_STRING 4
#define ERROR_EXPR_MISSING_BRACKET      5
#define ERROR_UNEXPECTED_TOKEN          6
#define ERROR_EXPR_EXPECTED_NUM         7
#define ERROR_EXPR_EXPECTED_STR         8
#define ERROR_LINE_NUM_TOO_BIG          9
// runtime errors
#define ERROR_OUT_OF_MEMORY             10
#define ERROR_EXPR_DIV_ZERO             11
#define ERROR_VARIABLE_NOT_FOUND        12
#define ERROR_UNEXPECTED_CMD            13
#define ERROR_BAD_LINE_NUM              14
#define ERROR_BREAK_PRESSED             15
#define ERROR_NEXT_WITHOUT_FOR          16
#define ERROR_STOP_STATEMENT            17
#define ERROR_MISSING_THEN              18
#define ERROR_RETURN_WITHOUT_GOSUB      19
#define ERROR_WRONG_ARRAY_DIMENSIONS    20
#define ERROR_ARRAY_SUBSCRIPT_OUT_RANGE 21
#define ERROR_STR_SUBSCRIPT_OUT_RANGE   22
#define ERROR_IN_VAL_INPUT              23
#define ERROR_BAD_PARAMETER             24

#define MAX_IDENT_LEN   8
#define MAX_FILENAME_LEN   12
#define MAX_NUMBER_LEN  10

// size of BASIC memory space this is the size allocated to mem[] which is where program and data are located
#define MEMORY_SIZE (10L*1024L)
extern unsigned char mem[];
extern int sysPROGEND;      // end of program (beginning of mem)
extern int sysSTACKSTART;   // start of evaluation stack
extern int sysSTACKEND;     // end of evaluation stack
extern int sysVARSTART;     // start of variable space
extern int sysVAREND;       // end of variable space
extern int sysGOSUBSTART;   // start of gosub stack
extern int sysGOSUBEND;     // end of gosub stack (end of mem)

extern uint16_t lineNumber; // 0 = input buffer

typedef struct {
  float val;
  float step;
  float end;
  uint16_t lineNumber;
  uint16_t stmtNumber;
}
ForNextData;

typedef struct {
  char *token;
  uint8_t format;
}
TokenTableEntry;

//extern const char *errorTable[];
extern const char* const errorTable[];


void reset();
int tokenize(unsigned char *input, unsigned char *output, int outputSize);
int processInput(unsigned char *tokenBuf);

#endif