Emscripten conversion for bas2tap which converts BASIC to a TAP tape file.
This package converts 'BASIC in an ASCII file' to a TAP tape image file, to be used in a ZX Spectrum emulator.
npm install bas2tapimport bas2tap from "bas2tap";
const tap = bas2tap('10 PRINT "Hello"');Note that you need to have the Emscripten SDK installed and available on path.
Install & activate emsdk from Emscripten:
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk/
git pull
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.shBuild the library:
npm install
npm run build
npm run testCopyleft (C) 1998-2013 ThunderWare Research Center, written by Martijn van der Heide.
This program 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 program 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.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
MIT License
Copyright (c) 2018 Damián Silvani
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Copyright (c) 2022 Steven Robertson
This program 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 program 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.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
1.0 26-03-98: First public release
1.1 01-04-98: Changes:
- Added banner.
- Switch -q does not suppress warnings, but progress indication.
- Added switch -w to suppress warnings.
- Added switch -e on popular demand.
- Empty lines are skipped and only generate a warning.
- Lines with only a line number generate an error.
- Numbers can also start with a decimal point (eg. '.5').
- Lines no longer require an end-of-line terminator.
- In-line sequence expansions also remove any trailing
spaces unless it was between quotes.
- The created TAP is made valid (although incomplete) if an error
occurs, unless it was a write error.
1.2 11-12-98: Changes:
- Block graphics were encoded rotated by 1.
- Added full syntax checking, and
- Added switch -n to disable the syntax checking again.
- Added expansion sequences '{CAT}' and '{CODE}' with the sole
purpose of being used as channel name in the OPEN # command.
- Changed the distribution policy from freeware to Open Source
Software.
1.3 04-01-99: Changes:
- Spaces after strings are now skipped (they are not needed).
- The 'CLS #' command does exist on the Interface 1 after all.
- Exponential numbers were raised the wrong way around
(eg. 25e3 became 0.025 and 25e-3 became 25000). Oooops....
1.4 17-05-99: Changes:
- UDGs used as 'USR "x"' would result in a crash due to 2
bad pointers.
- Complex expressions between brackets as parameter to other
expression types (eg. ATTR or string slicing) would screw
up the evaluation.
- The 'CLS #' command was flagged as being Interface 1
specific in the previous version rather than either
Interface 1 or Opus Discovery (aaargh!)
1.5 19-05-99: Changes:
- The 'DIM' command's syntax description was incorrect, so the
checker didn't like the variable name before the opening
bracket.
1.6 23-06-99: Changes:
- Several problems with array indices!
- The 'USR' token only accepted a numerical operand. An
exception was made for UDG expressions '"x"' but constructions
like 'USR CHR$ a' didn't work.
1.7 02-11-99: Changes:
- The DEF FN function requires insertion of evaluation room.
1.8 09-11-00: Changes:
- The DEF FN function only requires insertion of evaluation room
in the parameter area before the '=' token.
Any bracketed argument would upset the parser.
1.9 08-12-01: Changes:
- Forgot to skip the ';' colour token separator in class 9.
- REM statements should be parsed as-is (except for expansion
sequences), without taking out multiple spaces or counting
quotes.
2.0 11-12-02: Changes:
- SAVE/LOAD/VERIFY/MERGE DATA didn't work, as the DATA token was
set to be allowed as keyword only.
- ERASE ! didn't work, as ERASE was only allowed from the "m"
channel.
2.1 22-12-02: Changes:
- Any alphanumerical expression can be sliced, not only
variables and direct strings.
- If the output filename provided on the command line had the
extension '.TAP', it shouldn't be forced to '.tap'.
2.2 13-06-03: Changes:
- Expand sequences PAPER and INK had their codes reversed.
- Expand sequences BRIGHT and FLASH had their codes reversed.
- Expand sequences INVERSE and OVER had their codes reversed.
- Expand sequences {XX} didn't work (missing pointer advance).
- Expand sequences AT and TAB didn't work and threw a
warning instead (missing pointer advance).
2.3 05-07-04: Changes:
- LET is allowed to write to a substring.
2.4 24-07-05: Changes:
- BIN is a number format, not an expression token.
2.5 06-06-10: Changes:
- Functions would take "the rest of the expression" as argument
rather than just the next value.
- Stronger enforcement of separator tokens (;,') in a PRINT
statement.
- The use of 'TO' in string arrays was not accepted.
2.6 20-01-13: Changes:
- The PLAY command was not parsed properly.
BAS2TAP [-q] [-w] [-e] [-c] [-aX] [-sX] FileIn [FileOut]
-q goes into quiet mode, suppressing banner and progress indication.
-w suppress generation of warnings.
-e write errors to the stdout in stead of the stderr stream.
-c makes token matching case independant. The drawback is that variables that
have the same name as a token (eg. 'print') cannot be used, as they will be
treated as (unexpected) tokens.
-n disables syntax checking.
-aX sets the auto-start line to line X.
-sX sets the TAP block name to X (max 10 characters).
If no output filename is provided, the same name as the input file will be
used, but with extension .TAP.
The following rules apply:
- One BASIC line must be provided in one ASCII line.
- Keywords must appear in upper case (unless switch -c is used).
- Keywords that consist of multiple words (eg.
GO TO) must have the space in between the words. - Spaces between words are not needed, unless this leads to concatenation
problems - eg.
PRINTVAL"10"must appear asPRINT VAL"10", whilePRINT10is perfectly acceptable. - Syntax is fully checked according to
- the normal Spectrum ROM,
- Interface 1/Microdrive extension,
- Opus Discovery extension.
The following sequences are expanded in-line:
Chars Expand to
tab character 06 ("print '")
{XX} XX is 2-digit hex, converts to the Spectrum ASCII value
{(C)} character 7F (copyright sign)
{-X} X is 1-8, characters 80-87 (block graphics without shift)
{+X} X is 1-8, characters 88-8F (block graphics with shift)
{X} X is `A'-`U', converts to the UDG Spectrum ASCII value
{CODE} character AF ('CODE')
{CAT} character CF ('CAT')
Special sequences are (case independent) PAPER, INK, BRIGHT, FLASH, OVER, INVERSE, AT and TAB control sequences. They may appear as "{PAPER 3}" to convert to the sequence 0x10,0x03. Note that both AT and TAB take 2 operands, which should be seperated by a comma (eg. "{AT 1,10}"). Notice that these expansions are identical to what SGD and TAPER create when saving out BASIC blocks.
The source is provided in (almost) fully portable ANSI C, the source text is written in 132 columns.
If you wish to experiment with different syntax (eg. for a DISCiPLE), you may
find it useful to set the __DEBUG__ define.
If you make any fundamental change to the source, you are requested - but not
obligated - to send the changed source back to me, so that everyone can benefit
from it. My e-mail address is mheide@worldofspectrum.org
Enjoy!
Martijn van der Heide ThunderWare Research Center
Build dependencies:
- gcc
- cmake
- emscripten
Clone the repository and run npm run build to build the library. You can
then run npm run test to test it (check bas2tap.test.js). Also, npm run build:debug builds the project without optimizations.