revive

2026-05-20 22:33:54 +02:00 · 2024-08-21 13:00:10 -04:00
parent 047902adac
commit cb05906b00
13 changed files with 992 additions and 1 deletions
@@ -0,0 +1,339 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991
 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
                            Preamble
  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
 License is intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
 the GNU Lesser General Public License instead.)  You can apply it to
 your programs, too.
  When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 this service if you wish), that you receive source code or can get it
 if you want it, that you can change the software or use pieces of it
 in new free programs; and that you know you can do these things.
  To protect your rights, we need to make restrictions that forbid
 anyone to deny you these rights or to ask you to surrender the rights.
 These restrictions translate to certain responsibilities for you if you
 distribute copies of the software, or if you modify it.
  For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must give the recipients all the rights that
 you have.  You must make sure that they, too, receive or can get the
 source code.  And you must show them these terms so they know their
 rights.
  We protect your rights with two steps: (1) copyright the software, and
 (2) offer you this license which gives you legal permission to copy,
 distribute and/or modify the software.
  Also, for each author's protection and ours, we want to make certain
 that everyone understands that there is no warranty for this free
 software.  If the software is modified by someone else and passed on, we
 want its recipients to know that what they have is not the original, so
 that any problems introduced by others will not reflect on the original
 authors' reputations.
  Finally, any free program is threatened constantly by software
 patents.  We wish to avoid the danger that redistributors of a free
 program will individually obtain patent licenses, in effect making the
 program proprietary.  To prevent this, we have made it clear that any
 patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.
                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  0. This License applies to any program or other work which contains
 a notice placed by the copyright holder saying it may be distributed
 under the terms of this General Public License.  The "Program", below,
 refers to any such program or work, and a "work based on the Program"
 means either the Program or any derivative work under copyright law:
 that is to say, a work containing the Program or a portion of it,
 either verbatim or with modifications and/or translated into another
 language.  (Hereinafter, translation is included without limitation in
 the term "modification".)  Each licensee is addressed as "you".
 Activities other than copying, distribution and modification are not
 covered by this License; they are outside its scope.  The act of
 running the Program is not restricted, and the output from the Program
 is covered only if its contents constitute a work based on the
 Program (independent of having been made by running the Program).
 Whether that is true depends on what the Program does.
  1. You may copy and distribute verbatim copies of the Program's
 source code as you receive it, in any medium, provided that you
 conspicuously and appropriately publish on each copy an appropriate
 copyright notice and disclaimer of warranty; keep intact all the
 notices that refer to this License and to the absence of any warranty;
 and give any other recipients of the Program a copy of this License
 along with the Program.
 You may charge a fee for the physical act of transferring a copy, and
 you may at your option offer warranty protection in exchange for a fee.
  2. You may modify your copy or copies of the Program or any portion
 of it, thus forming a work based on the Program, and copy and
 distribute such modifications or work under the terms of Section 1
 above, provided that you also meet all of these conditions:
    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.
    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.
    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)
 These requirements apply to the modified work as a whole.  If
 identifiable sections of that work are not derived from the Program,
 and can be reasonably considered independent and separate works in
 themselves, then this License, and its terms, do not apply to those
 sections when you distribute them as separate works.  But when you
 distribute the same sections as part of a whole which is a work based
 on the Program, the distribution of the whole must be on the terms of
 this License, whose permissions for other licensees extend to the
 entire whole, and thus to each and every part regardless of who wrote it.
 Thus, it is not the intent of this section to claim rights or contest
 your rights to work written entirely by you; rather, the intent is to
 exercise the right to control the distribution of derivative or
 collective works based on the Program.
 In addition, mere aggregation of another work not based on the Program
 with the Program (or with a work based on the Program) on a volume of
 a storage or distribution medium does not bring the other work under
 the scope of this License.
  3. You may copy and distribute the Program (or a work based on it,
 under Section 2) in object code or executable form under the terms of
 Sections 1 and 2 above provided that you also do one of the following:
    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,
    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,
    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)
 The source code for a work means the preferred form of the work for
 making modifications to it.  For an executable work, complete source
 code means all the source code for all modules it contains, plus any
 associated interface definition files, plus the scripts used to
 control compilation and installation of the executable.  However, as a
 special exception, the source code distributed need not include
 anything that is normally distributed (in either source or binary
 form) with the major components (compiler, kernel, and so on) of the
 operating system on which the executable runs, unless that component
 itself accompanies the executable.
 If distribution of executable or object code is made by offering
 access to copy from a designated place, then offering equivalent
 access to copy the source code from the same place counts as
 distribution of the source code, even though third parties are not
 compelled to copy the source along with the object code.
  4. You may not copy, modify, sublicense, or distribute the Program
 except as expressly provided under this License.  Any attempt
 otherwise to copy, modify, sublicense or distribute the Program is
 void, and will automatically terminate your rights under this License.
 However, parties who have received copies, or rights, from you under
 this License will not have their licenses terminated so long as such
 parties remain in full compliance.
  5. You are not required to accept this License, since you have not
 signed it.  However, nothing else grants you permission to modify or
 distribute the Program or its derivative works.  These actions are
 prohibited by law if you do not accept this License.  Therefore, by
 modifying or distributing the Program (or any work based on the
 Program), you indicate your acceptance of this License to do so, and
 all its terms and conditions for copying, distributing or modifying
 the Program or works based on it.
  6. Each time you redistribute the Program (or any work based on the
 Program), the recipient automatically receives a license from the
 original licensor to copy, distribute or modify the Program subject to
 these terms and conditions.  You may not impose any further
 restrictions on the recipients' exercise of the rights granted herein.
 You are not responsible for enforcing compliance by third parties to
 this License.
  7. If, as a consequence of a court judgment or allegation of patent
 infringement or for any other reason (not limited to patent issues),
 conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License.  If you cannot
 distribute so as to satisfy simultaneously your obligations under this
 License and any other pertinent obligations, then as a consequence you
 may not distribute the Program at all.  For example, if a patent
 license would not permit royalty-free redistribution of the Program by
 all those who receive copies directly or indirectly through you, then
 the only way you could satisfy both it and this License would be to
 refrain entirely from distribution of the Program.
 If any portion of this section is held invalid or unenforceable under
 any particular circumstance, the balance of the section is intended to
 apply and the section as a whole is intended to apply in other
 circumstances.
 It is not the purpose of this section to induce you to infringe any
 patents or other property right claims or to contest validity of any
 such claims; this section has the sole purpose of protecting the
 integrity of the free software distribution system, which is
 implemented by public license practices.  Many people have made
 generous contributions to the wide range of software distributed
 through that system in reliance on consistent application of that
 system; it is up to the author/donor to decide if he or she is willing
 to distribute software through any other system and a licensee cannot
 impose that choice.
 This section is intended to make thoroughly clear what is believed to
 be a consequence of the rest of this License.
  8. If the distribution and/or use of the Program is restricted in
 certain countries either by patents or by copyrighted interfaces, the
 original copyright holder who places the Program under this License
 may add an explicit geographical distribution limitation excluding
 those countries, so that distribution is permitted only in or among
 countries not thus excluded.  In such case, this License incorporates
 the limitation as if written in the body of this License.
  9. The Free Software Foundation may publish revised and/or new versions
 of the General Public License from time to time.  Such new versions will
 be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.
 Each version is given a distinguishing version number.  If the Program
 specifies a version number of this License which applies to it and "any
 later version", you have the option of following the terms and conditions
 either of that version or of any later version published by the Free
 Software Foundation.  If the Program does not specify a version number of
 this License, you may choose any version ever published by the Free Software
 Foundation.
  10. If you wish to incorporate parts of the Program into other free
 programs whose distribution conditions are different, write to the author
 to ask for permission.  For software which is copyrighted by the Free
 Software Foundation, write to the Free Software Foundation; we sometimes
 make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
                            NO WARRANTY
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 REPAIR OR CORRECTION.
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
                     END OF TERMS AND CONDITIONS
            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 Also add information on how to contact you by electronic and paper mail.
 If the program is interactive, make it output a short notice like this
 when it starts in an interactive mode:
    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, the commands you use may
 be called something other than `show w' and `show c'; they could even be
 mouse-clicks or menu items--whatever suits your program.
 You should also get your employer (if you work as a programmer) or your
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  Here is a sample; alter the names:
  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.
  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice
 This General Public License does not permit incorporating your program into
 proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
 library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.
@@ -0,0 +1,491 @@
 ---
 title: "Turbo-Basic XL and Atari BASIC parser tool"
 author: https://github.com/dmsc/tbxl-parser
 book: true
 classoption: [oneside]
 titlepage: true,
 titlepage-text-color: "FFFFFF"
 titlepage-rule-color: "FFFFFF"
 titlepage-rule-height: 0
 titlepage-background: "expr.pdf"
 ...
 # Turbo-Basic XL and Atari BASIC parser tool
 This program parses and tokenizes a _Turbo-Basic XL_ or _Atari BASIC_ listing in
 a flexible format and produces any of three outputs:
 - A tokenized binary file, directly loadable in the original _Turbo-Basic XL_
  (or _Atari BASIC_ if the `-A` option is given) interpreter.  This mode also
  replaces variables with single letters by default, but with the `-f` option
  writes the full variable names and with the `-x` option writes empty variable
  names, making the program unable to be listed or edited.
  This is the default operating mode, and also can be forced with the `-b`
  command line switch.
 - A minimized listing, replacing variable names with single letters, using
  abbreviations, removing spaces and using Atari end of lines.
  This mode is selected with the `-s` command line switch. Adding the `-f`
  option keeps the names of variables with 2 or less characters.
 - A pretty printed expanded listing, with one statement per line and
  indentation, and standard ASCII line endings.
  Note that this format can be read back again, but some statements are
  transformed in the process, this can lead to problems in non-standard
  `IF`/`THEN` constructs.
  Currently, `IF`/`THEN` with statements after the `THEN` are converted to
  multi-line `IF`/`ENDIF` statements.
  This mode is selected with the `-l` command line switch.
 ## Example Programs
 The following is an example of a simple program in free form:
 ```purebasic
  ' Example program
  ' One statement per line:
  print "Hello All"
  print "---------"
  print "This is a heart: \00"
  ' Also, multiple statements per line:
  for counter = 0 to 10 : ? "Iter: "; counter : next counter
  ' Line numbers
 30
  ' And abbreviations:
  g. 30
 ```
 To generate a tokenized BAS file, loadable by _Turbo-Basic XL_, simply type:
    basicParser samples/sample-1.txt
 This will generate a `sample-1.bas` file in the same folder.
 If on the other hand you want a minimized listing file in ATASCII format (suitable
 for `ENTER` into _Atari BASIC_, type:
    basicParser -l -A samples/sample-1.txt
 This will generate a `sample-1.lst` file in the same folder.
 There are more sample programs, located in the `samples` folder that illustrate
 the free-form input format.
 ## Input listing format
 The parser accepts standard listings for _Atari BASIC_ or _Trubo-Basic XL_
 programs, with Atari or ASCII end of lines.
 All the standard abbreviations available in the original interpreters are also
 accepted.
 As with _Turbo-Basic XL_, the input is case insensitive (uppercase, lowercase
 and mixed case is supported).
 ### Line numbers
 You can omit line numbers, only lines that are target to `GOTO` / `GOSUB` /
 `THEN` needs them.  If you use only labels, no line numbers are needed.
 Also, line numbers can appear alone in a line, for better readability.
 ### Comments
 Comments can be started by `'` in addition to the _Turbo-Basic XL_ `.`, `--`
 or `rem`. In short listing an tokenized output formats all comments are
 removed unless the `-k` option is given.
 All comment types are supported in _Atari BASIC_ mode.
 ### Special characters inside string constants
 Inside strings, special characters can be specified by using a backslash
 followed by an hexadecimal number in upper-case, (i.e., `"\00\A0"` produces a
 string with a "heart" and an inverse space "♥█"), this allows editing special
 characters on any standard editor.
 Note that to force a backslash before a valid hex number, you can use two
 backslashes (i.e., ``"123\\456"`` produces ``123\456``).
 ### Extended string constants
 There is support for extended strings, with embedded character names.
 Extended strings start with with `["` and ends with `"]`, and can contain:
 - Special characters with `{name}` or `{count*name}`, with count a decimal
  number and name from the list:
  `heart`, `rbranch`, `rline`, `tlcorner`, `lbranch`, `blcorner`, `udiag`,
  `ddiag`, `rtriangle`, `brblock`, `ltriangle`, `trblock`, `tlblock`,
  `tline`, `bline`, `blblock`, `clubs`, `brcorner`, `hline`, `cross`, `ball`,
  `bbar`, `lline`, `bbranch`, `tbranch`, `lbar`, `trcorner`, `esc`, `up`,
  `down`, `left`, `right`, `diamond`, `spade`, `vline`, `clr`,
  `del`, `ins`, `tbar`, `rbar`, `eol`, `bell`.
 - Inverse video characters surrounded by `~`.
 - Multiple lines, you can terminate the string in a different line than the
  start. Note that this will embed end-of-line characters in the string, so it
  will only work in tokenized output, not short-listing output.
 ### Parameters and local variables for `PROC`
 Arguments follow the `PROC` label after a comma, and local variables follow
 after a semicolon:
 ```purebasic
  D = 3
  EXEC Testing, D+5, "Hello"
  PRINT D
  PROC Testing, A, B$(10); D
      D = A + 1
      PRINT D; " and "; B$
  ENDPROC
 ```
 As the example shows, string variables must include the dimensioned length,
 as the parser adds a `DIM` at the start of the program to initialize. The
 dimensioned length must be an integer, a `$define` or a `%` number.
 Also, setting the value of variable "D" inside the procedure does not alter
 the value of the variable "D" outside the procedure.
 The parser transform this construct by creating new variables that hold the
 parameters and local variables, so the resulting procedures don't support
 recursion.
 ### Syntax from _Turbo-Basic XL_ in _Atari BASIC_
 Some of the extra statements from _Turbo-Basic XL_ are supported even in _Atari
 BASIC_ output mode, those are converted to equivalent forms:
 - Multi-line `IF`/`ENDIF` statements are converted to `IF`/`THEN`.
 - The `%0` to `%3` tokens are converted to the numbers 0 to 3.
 - `PUT` without I/O channel is converted to `PUT #16`. This relies on a bug
  in _Atari BASIC_ that makes I/O channel 16 equal to 0.
 - String constants are converted to decimal constants.
 ### Parsing directives
 There are parsing *directives* added, that consist on lines starting with a
 dollar sign `$`. A list of available directives is documented bellow.
 ## Program Usage
    basicParser [options] [-o output] filenames
 Options:
 - `-n nun`  Sets the maximum line length before splitting lines to `num`.
            Note that if a single statement is longer than this, the line
            is output anyway.
            The default is 120 characters (the standard Atari Editor limit)
 - `-l`  Output long (readable) listing, suitable for editing, with standard
        end of lines and lowercase statements.
 - `-s`  Output a short, minimized listing, with ATASCII end of lines. The
        default output file name is the same as input with `.lst` extension
        added.
 - `-b`  Output a binary tokenized file instead of a listing. The  default
        output file name is the same as input with `.bas` extension added. Note
        that this is the default behaviour.
 - `-A`  Accept (and produce) standard _Atari BASIC_ language, without the
        extended statements and syntax. Note that some of the optimizations are
        specific to _Turbo-Basic XL_ and won't run in this mode.
 - `-x`  In binary output mode, writes null variable names, making the program
        unlistable. This options does nothing on listing output.
 - `-f`  In binary output mode, writes the full variable names, this eases
        debugging the program. In short listing mode, keeps the names of
        variables with less than two characters, renaming all longer or invalid
        names.
 - `-k`  In binary output mode, keeps comments in the output. Note that only
        standard comments are included, not new style (`'`) comments.
 - `-a`  In long output, replace Atari characters in comments with
        approximating characters.
 - `-v`  Shows more parsing information, like name of renamed variables.
        (verbose mode)
 - `-q`  Don't show any parsing output, only errors.  (quiet mode)
 - `-o`  Sets the output file name.  By default, the output is the name of the
        input with `.lst` (listing) or `.bas` (tokenized) extension. If the
        given name starts with a dot, use as output file name extension.
 - `-c`  Output to standard output instead of a file.
 - `-O`  Enables parser optimizations to produce smaller or faster code. Without
        and argument enables all optimizations, an argument can be given
        similar to the `optimize` directive in the code, see bellow for the
        possible options. The option can be specified multiple times, an
        example for producing short listings is `-O -O -convert_percent -O
        -const_replace`
 - `-h`  Shows help and exit.
 ## Parser directives
 Directives add extra features to the parser, much like C and C++. Directives
 start with a dollar as the first non blank character on a line, and continue
 up to the end of the line.
 Bellow is a description of available directives.
 ### `$options` directive.
 The options directive alter the way the parsing is done, accepting a list of
 comma separated options, valid for the current file. Valid options:
 - `mode=compatible`: Disable features to be more compatible with the
  _Turbo-Basic XL_ parser.
 - `mode=extended`: Makes the parser to accept more extended features.
 - `mode=default`: Returns the parser to the default mode.
 - `optimize` or `+optimize`: Allows the parser to optimize the output to
  produce smaller or faster code.
 - `-optimize`: Disable the optimizations.
 - `optimize=+`*suboption*: Enable the particular optimization option.
 - `optimize=-`*suboption*: Disable the particular optimization option.
 The optimization sub-options are:
 - `const_folding`: Replace operations on constants with the result.
 - `convert_percent`: Replace small integers with the `%*` equivalent, this is
  only available in _Turbo-Basic XL_ mode.
 - `commute`: Swap arguments to binary operations to minimize runtime.
 - `line_numbers`: Remove all BASIC line numbers that are unused.
 - `const_replace`: Replace repeated constant values (numeric or string) with
  a variable initialized to the value. The initialization code is added
  before any statement in the program, and tries to use the minimum number
  of bytes posible.
 - `fixed_vars`: This is the complement of the `const_replace` option, tries to
  identify variables with a fixed value in the whole program and removes the
  variable. Use this optimization when converting original basic listings, as
  reversing the constant replacing gives a simpler listing and allows to apply
  further optimizations.  Note that currently this option can produce bad
  results, as it does not follows the program flow and can't detect if a
  variable is used before the first assignment, so it is not enabled by
  default. You need to check each removed variable, as printed in the output
  and in the comments in the resulting program.
 - `then_goto`: Searches `IF` statements with `THEN GOTO` and removes the `GOTO`
  statement, replacing with the line number alone.
  Note: If the line number is not a constant, the resulting program will be
  executed and listed correctly by both _Atari BASIC_ and _Turbo-Basic XL_, but
  can't be entered because of an original parser limitation. Therefore, this
  conversion is only done for constant values when the output is a short listing.
  Example: `IF X THEN GOTO 100` becomes `IF X THEN 100`
 - `if_goto`: Performs the same optimization as `then_goto`, but also replaces
  instances of multi-line `IF` statements containing a `GOTO` with `THEN` and
  the target line number.
  This optimization is not enabled by default because it can produce larger
  code by forcing a newline in the file.
  Example:
  ```
  IF X
    GOTO 100
  ENDIF
  ```
  becomes
  ```
  IF X THEN 100
  ```
 Note that options can be changed at any place in the file, this is an example
 of changing the parser mode in the middle of the file:
 ```purebasic
  ' Example program using directives
  $ options optimize, mode=default
  error1 = 2
  ? error1   : ' This is parsed like Turbo-Basic XL, as ? ERR OR 1
  $options mode = extended
  ? error1   : ' This is parsed as ? error1
  Printa     : ' This is a parsing error.
 ```
 A good optimization mode for producing short listings is:
 ```
    $options +optimize, optimize=-convert_percent-const_replace
 ```
 The above line instructs the parser to avoid converting numbers to `%` values
 and the replacement of constants, producing a smaller listing. Note that
 replacement of constants can be beneficial, so try enabling the optimization
 and running with "-v" option to see what variables are good candidates for
 replacement.
 ### `$define` directive.
 This directive defines new symbols that are replaced at parsing time with the
 values, like C macros.
 Replacement names are prefixed by `@` to differentiate from variables, and
 as variables, string defines end in `$`, the syntax of the directive is:
  `$define` *defineName* `=` *value*
 Keep in mind that as the value is replaced each time the variable is used, it
 is probably best to assign them to a variable instead if the value will be
 used multiple times, and you should enable optimizations so that the usage is
 simplified at parsing time.
 This is an example usage of the `$define` directive:
 ```purebasic
  ' Example usage of defines
  $options +optimize
  $define Message$ = "Hello world!"
  $define PCOLR0   = $2C0
  print @Message$       : ' Replaced by: ? "Hello world!"
  print len(@Message$)  : ' Replaced by: ? 12
  poke @PCOLR0+2, $1F   : ' Replaced by: POKE 706,31
 ```
 ### `$incbin` directive.
 This directive allows including data from a binary file to a new string
 definition. The content of the file is read at parsing time and the full
 content is stored in the define. The syntax of the directive is:
  `$incbin` *defineName$* `, "`*fileName*`"`  [ , *offset* [, *length* ] ]
 The optional *offset* parameter specifies a starting offset in bytes for
 the included data, and the optional *length* parameter specifies the number
 of bytes to read. If *length* is not given, the file read completely.
 This is an example usage of the `$incbin` directive:
 ```purebasic
  $options +optimize
  $incbin asmBin$, "myasm.bin"
  asmRut = adr( @asmBin$ ) : ' Store address in variable to use multiple times.
  ? usr(asmRut, 1, 2)      : ' Call routine. Should be relocatable and less than 242 bytes.
 ```
 ### `$incdata` directive.
 This directive allows including data from a binary file to a `DATA` BASIC
 statement. The content of the file is read at parsing time and the full content
 is stored as is. The syntax of the directive is:
  `$incdata` `"`*fileName*`"`  [ , *offset* [, *length* ] ]
 The optional *offset* parameter specifies a starting offset in bytes for the
 included data, and the optional *length* parameter specifies the number of
 bytes to read. If *length* is not given, the file read completely.
 Note that you can use this directive to store arbitrary bytes inside the
 statement, but BASIC parses the actual data at `READ` time.
 ## Limitations and Incompatibilities
 There are some incompatibilities in the way the source is interpreted with the
 standard _Turbo-Basic XL_ and _Atari BASIC_ parsers:
 - The ASCII LF character (hexadecimal $10) is interpreted as end of line in
  addition to the ATASCI EOL (hexadecimal $9B). This means that in `DATA`
  statements and comments the LF character is not accepted.
 - The parsing of special characters inside strings means that a valid hexadecimal
  sequence (`\**`, with `*` an hexadecimal number in uppercase) or two backslashes
  are interpreted differently.
 - Extra statements after an `IF`/`THEN`/`LineNumber` are converted to a comment,
  with the exception of `DATA` statements.
  In the original, those statements are never executed, so this is not a problem
  with proper code.
 - Any string is accepted as a variable name, even if it is already an statement,
  function name or operator.
  The following code is valid:
  ```purebasic
    PRINTED = 0     : ' Invalid in Atari BASIC, as starts with "PRINT"
    DONE = 3        : ' Invalid in Turbo-Basic XL, as starts with "DO"
  ```
  This relaxed handling of variable naming creates an incompatibility, as the
  first example above is parsed differently as the standard _Atari BASIC_,
  where it means "`PRINT (ED = 0)`" instead of "`LET PRINTED = 0`".
  Note that currently, even full statements are accepted as variable names,
  but avoid using them as they could produce hard to understand errors.
 - In long format listing output, `IF`/`THEN` are converted to `IF`/`ENDIF`
  statements. This introduces an incompatibility with the following code:
  ```purebasic
    FOR A = 0 TO 2
      ? "A="; A; " - ";
      IF A <> 0
        ? "1";
        IF A = 1 THEN ELSE
        ? "2";
      ENDIF
      ? " -"
    NEXT A
  ```
  This code should produce the following at output:
  ```
    A=0 - 2 -
    A=1 - 1 -
    A=2 - 12 -
  ```
  After conversion, the `ELSE` is associated with the second `IF` instead
  of the first, giving the wrong result.
 - Parsing of `TIME$=` statement allows a space between `TIME$` and the equals
  sign, but in _Turbo-Basic XL_ this gives an error.
 ## Compilation
 To compile from source, you need `gawk` and `peg`, both are available in any
 recent Debian or Ubuntu Linux distro, install with:
    apt-get install gawk peg
 To compile, simply type `make` in the sources folder, a folder `build` will be
 created with the executable program inside.
@@ -0,0 +1,16 @@
  ' Example program
  ' One statement per line:
  print "Hello All"
  print "---------"
  print "This is a heart: \00"
  ' Also, multiple statements per line:
  for counter = 0 to 10 : ? "Iter: "; counter : next counter
  ' Line numbers
 30
  ' And abbreviations:
  g. 30
@@ -0,0 +1,60 @@
  ' Example program with procs and labels
  dim name$(20), reply$(1)
  ' Ask your name
  exec ask_name
  ? "Hello "; name$
  ? "Think a number from 1 to 100, I will try to guess it."
  pause 60
  ? "Ready?"
  pause 60
  low = 1
  high = 100
  ' Loop guessing numbers until we have no more guesses
  while high - low > 0
    my_guess = low + (high - low + 1) div 2
    exec ask_guess
    if reply = 1
      ? "I'm a genius, this was your number!!!"
      low = my_guess
      exit
    endif
    if reply = 2
      low = my_guess + 1
    else
      high = my_guess - 1
    endif
  wend
  ' We should have guessed
  ? "So, your number is "; low
  end
  ' A procedure to ask a name
 proc ask_name
    name$ = ""
    repeat
        input "What is your name"; name$
    until len(name$) > 1
 endproc
  ' Procedure to guess a number
 proc ask_guess
    ?
    ? "My guess is "; my_guess
    repeat
        ? "Tell me, your number is"
        input "Higher, Lower of Equal"; reply$
        reply = uinstr("EHL", reply$)
    until reply > 0
 endproc
@@ -0,0 +1,17 @@
  ' Example of extended strings
  ' Note that this example can not be directly converted to LIST format,
  ' as it uses EOL embedded inside strings.
  ' Test with "basicParse -b sample-3.txt"
  print ["{clr}
 {17*bline}
 {rline}~Hello ATARI World~{lline}
 {17*tline}
 "]
 ' Do some color effects
 do
  setcolor 2,peek(20),4
 loop
@@ -0,0 +1,68 @@
  ' Example program for parser directives
  ' Enable all optimizations:
  $options +optimize
  ' Include graphics from a binary file
  $incbin dataPM$, "sample-4.pm"
  ' Some defines
  $define RAMTOP = $6A
  $define SDMCTL = 559
  $define PCOLR0 = 704
  $define HPOSP0 = $D000
  $define GRACTL = $D01D
  $define PMBASE = $D407
  ' Enable P/M
  MemTop = peek(@RAMTOP) - 4
  poke @RAMTOP, MemTop
  graphics 0
  P0Mem = 256 * MemTop + 512
  ' Clear P0 memory
  poke P0Mem, 0
  move P0Mem, P0Mem+1, 127
  poke @PCOLR0, $1F               : ' Set P0 color
  poke @SDMCTL, peek(@SDMCTL) ! 8 : ' Enable Player DMA
  poke @PMBASE, MemTop            : ' Set PMBASE
  poke @GRACTL, 2                 : ' Turns on Player read from ANTIC
  oldYpos = P0Mem + 1
  Ypos = 50
  Xpos = 100
  dx = 1
  dy = 1
  ' Loop movement of the player
  do
    pause 0
    exec MovePM
    Xpos = Xpos + dx
    Ypos = Ypos + dy
    if Xpos < 48
      dx = 1
    endif
    if Xpos > 200
      dx = -1
    endif
    if Ypos < 16
      dy = 1
    endif
    if Ypos > 100
      dy = -1
    endif
  loop
  end
  ' Move P/M
  proc MovePM
    ' Set X position
    poke @HPOSP0, Xpos
    ' Clear old data
    move oldYpos - 1, oldYpos, len( @dataPM$ ) + 1
    ' Set new data
    move adr( @dataPM$ ), P0Mem + Ypos, len( @dataPM$ )
    oldYpos = P0Mem + Ypos
  endproc
@@ -10,7 +10,7 @@
 '+ after suicide "how many units of 76' when bad first letter
 '+loading game does not really work, it starts again'
-$options +optimize, optimize=-fixed_vars-const_replace
+''$options +optimize, optimize=-fixed_vars-const_replace
 '$options mode=compatible
 REM modified 061485 by Bruce Ramsey 411 N 61st, Seattle, WA 98103