PPWIZARD is a free preprocessor for HTML, REXX, Visual Basic or any text files.
Rexx Parsing |
You can get a rexx manuals (for regina) from http://www.lightlink.com/hessling/, there are HTML and PDF versions available.
Parsing is another of rexx's complex areas, a subset of its syntax is summarised here:
PARSE [UPPER] LINEIN [template] PARSE [UPPER] NUMERIC template PARSE [UPPER] VAR symbol template PARSE [UPPER] VALUE expression WITH template template -> [firstPosition] assignments [assignments] assignments -> [nextPosition] varlist [stopPosition] varlist -> varname ' ' [varlist] varname -> "non-constant symbol" | '.' firstPosition -> position nextPosition -> position [nextPosition] stopPosition -> position position -> searchPosition | absPosition | relPosition | '(' "expression" ')' searchPosition -> "string constant" absPosition -> "integer" | '=' numexpr relPosition -> '+' numexpr | '-' numexpr numexpr -> "integer" | '(' "integer expression" ')'
This is an example of extracting each directory (one at a time) from the path (located in DOS or OS/2 environment):
;--- Get "PATH" from environment #evaluate ^^ ^_Path = GetEnv('PATH')^ ;--- Start list ----------------- <P>The path is: <OL> ;--- List Components ------------ #{ ;--- Get next directory name - #evaluate ^^ ^parse var _Path _ThisBit ';' _Path^ ;--- Exit if at end of path -- #if _ThisBit = '' & _Path='' #break #endif ;--- Output directory name --- <LI><??_ThisBit> #} ;--- End list ------------------- </OL>