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stypp Pretty Printer


'stypp' serves as a pretty printer for source files written in a styx-conform language. Beside that it can be used to port source files, provided that the abstract syntax of the source and target language are equivalent. The conversion includes all comments. A user-defined token conversion handler can be applied.

The work on this program, especially on the pretty printer layout, ist still in progress. The current version doesn't support the embedded language facility.

Arguments


NameTypeSemantic
srclang name source language name
dstlang name target language name
filename path path of source file to transform



Options

An option will be specified as follows: -<Name>=<Value>
A flag is toggled that way: -<Name>
The default value will be applied when the option wasn't specified.

NameTypeDefault valueSemantic
charset string"" source file character set ( UTF-8, UCS4, ... )
skipset string"" ( ascii ) characters to be skipped
lookahead flagfalse enable n character lookahead
wprint flagfalse unicode / UTF-8 output ( on non-default character set )
prepar string"" standard preprocessing: yes or list index~value , ...
premac string"" standard preprocessing: pre-defined macro , ...
prefun string"" user-defined preprocessing: Function@Library ( not with prepar-option )
Start string"" start symbol
xaron flagfalse create a derivation tree ( lisp like representation )
early flagfalse use early reduction
shiftfun string"" user-defined token conversion: Function@Library ( see [ptm_gen] )
reducefun string"" user-defined nonterminal conversion: Function@Library ( see [ptm_gen] )
ppfun string"" user-defined token conversion: Function@Library ( see [ptm_pp] )

The options 'prepar' and 'premac' are only useful with styx-like preprocessing.

If your language uses the same preprocessing directives as specified in [styx.sty], but differnt macro token identifiers and keywords, the option 'prepar' can be used to enable preprocessing and specify the differences as a comma separated list:

  1. 0~name of identifier token
  2. 1~name of macro definition token
  3. 2~name of argument separator token
  4. 3~name of include token
  5. 4~name of conditional token
  6. 5~name of undefine token
  7. 6~#macro keyword
  8. 7~#end keyword
  9. 8~#ifdef keyword
  10. 9~#ifndef keyword
  11. 10~#else keyword
  12. 11~#include keyword
  13. 12~#undefine keyword
  14. 13~environment variable or path list as search path for include files
  15. 14~include file character set ( default: charset-option )

The option 'premac' supports pre-defined macros in connection with styx-like preprocessing.

Dynamic library support is a prerequisite for the user-defined callback handler.

Environment

An environment variable will be specified as follows: -<Name>=<Value>
The default value will be applied when no environment variable was specified.

NameTypeDefault valueSemantic
BINSTYX pathPATH search environment for [srclang.pim], [srclang.lim], [dstlang.pim] and [dstlang.lim]