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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

Name | Type | Semantic
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.

Name | Type | Default value | Semantic
charset | string | "" | source file character set ( UTF-8, UCS4, ... )
skipset | string | "" | ( ascii ) characters to be skipped
lookahead | flag | false | enable n character lookahead
wprint | flag | false | 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 | flag | false | create a derivation tree ( lisp like representation )
early | flag | false | 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.

Name | Type | Default value | Semantic
BINSTYX | path | PATH | search environment for [srclang.pim], [srclang.lim], [dstlang.pim] and [dstlang.lim]