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{ IHX (Intel Hex format) to TZX (ZX Spectrum tape file format) convertor tool
This file contains various definitions, constants and utility functions for
dealing with BASIC programs on the ZX Spectrum.
Copyright (C) 2020 Nikolay Nikolov <nickysn@users.sourceforg.net>
This source is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This code is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
A copy of the GNU General Public License is available on the World Wide Web
at <http://www.gnu.org/copyleft/gpl.html>. You can also obtain it by writing
to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1335, USA.
}
unit zxbasic;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
const
{ the ZX BASIC special keyword character set }
BC_RND = #165; { RND }
BC_INKEYS = #166; { INKEY$ }
BC_PI = #167; { PI }
BC_FN = #168; { FN }
BC_POINT = #169; { POINT }
BC_SCREENS = #170; { SCREEN$ }
BC_ATTR = #171; { ATTR }
BC_AT = #172; { AT }
BC_TAB = #173; { TAB }
BC_VALS = #174; { VAL$ }
BC_CODE = #175; { CODE }
BC_VAL = #176; { VAL }
BC_LEN = #177; { LEN }
BC_SIN = #178; { SIN }
BC_COS = #179; { COS }
BC_TAN = #180; { TAN }
BC_ASN = #181; { ASN }
BC_ACS = #182; { ACS }
BC_ATN = #183; { ATN }
BC_LN = #184; { LN }
BC_EXP = #185; { EXP }
BC_INT = #186; { INT }
BC_SOR = #187; { SOR }
BC_SGN = #188; { SGN }
BC_ABS = #189; { ABS }
BC_PEEK = #190; { PEEK }
BC_IN = #191; { IN }
BC_USR = #192; { USR }
BC_STRS = #193; { STR$ }
BC_CHRS = #194; { CHR$ }
BC_NOT = #195; { NOT }
BC_BIN = #196; { BIN }
BC_OR = #197; { OR }
BC_AND = #198; { AND }
BC_LE = #199; { <= }
BC_GE = #200; { >= }
BC_NEQ = #201; { <> }
BC_LINE = #202; { LINE }
BC_THEN = #203; { THEN }
BC_TO = #204; { TO }
BC_STEP = #205; { STEP }
BC_DEF_FN = #206; { DEF FN }
BC_CAT = #207; { CAT }
BC_FORMAT = #208; { FORMAT }
BC_MOVE = #209; { MOVE }
BC_ERASE = #210; { ERASE }
BC_OPEN = #211; { OPEN }
BC_CLOSE = #212; { CLOSE }
BC_MERGE = #213; { MERGE }
BC_VERIFY = #214; { VERIFY }
BC_BEEP = #215; { BEEP }
BC_CIRCLE = #216; { CIRCLE }
BC_INK = #217; { INK }
BC_PAPER = #218; { PAPER }
BC_FLASH = #219; { FLASH }
BC_BRIGHT = #220; { BRIGHT }
BC_INVERSE = #221; { INVERSE }
BC_OVER = #222; { OVER }
BC_OUT = #223; { OUT }
BC_LPRINT = #224; { LPRINT }
BC_LLIST = #225; { LLIST }
BC_STOP = #226; { STOP }
BC_READ = #227; { READ }
BC_DATA = #228; { DATA }
BC_RESTORE = #229; { RESTORE }
BC_NEW = #230; { NEW }
BC_BORDER = #231; { BORDER }
BC_CONTINUE = #232; { CONTINUE }
BC_DIM = #233; { DIM }
BC_REM = #234; { REM }
BC_FOR = #235; { FOR }
BC_GO_TO = #236; { GO TO }
BC_GO_SUB = #237; { GO SUB }
BC_INPUT = #238; { INPUT }
BC_LOAD = #239; { LOAD }
BC_LIST = #240; { LIST }
BC_LET = #241; { LET }
BC_PAUSE = #242; { PAUSE }
BC_NEXT = #243; { NEXT }
BC_POKE = #244; { POKE }
BC_PRINT = #245; { PRINT }
BC_PLOT = #246; { PLOT }
BC_RUN = #247; { RUN }
BC_SAVE = #248; { SAVE }
BC_RANDOMIZE = #249; { RANDOMIZE }
BC_IF = #250; { IF }
BC_CLS = #251; { CLS }
BC_DRAW = #252; { DRAW }
BC_CLEAR = #253; { CLEAR }
BC_RETURN = #254; { RETURN }
BC_COPY = #255; { COPY }
function BAS_EncodeNumber(N: Integer): ansistring;
function BAS_EncodeNumber(N: Real): ansistring;
function BAS_EncodeLine(LineNr: Integer; const Line: string): ansistring;
implementation
function BAS_EncodeNumber(N: Integer): ansistring;
begin
if (N >= -65535) and (N <= 65535) then
begin
Str(N, Result);
N := Abs(N);
Result := Result + #14#0#0 + Chr(Byte(N)) + Chr(Byte(N shr 8)) + #0;
end
else
Result := BAS_EncodeNumber(Real(N));
end;
function BAS_EncodeNumber(N: Real): ansistring;
begin
raise ENotImplemented.Create('Real number support not yet implemented');
end;
function BAS_EncodeLine(LineNr: Integer; const Line: string): ansistring;
begin
Result := Chr(Byte(LineNr shr 8)) + Chr(Byte(LineNr)) +
Chr(Byte((Length(Line) + 1))) + Chr(Byte((Length(Line) + 1) shr 8)) +
Line + #13;
end;
end.
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