link="#009900" vlink="#007700" alink="#cc0000"> Teachpacks for How to Design Programs

Documents

docs.ss

The teachpack docs.ss provides three operations:

atom? : SchemeValue -> bool
which determines whether or not a Scheme value is a number, a symbol, or a string;
Note: This notion of atom is different from that in the compat.ss library.

annotation? : SchemeValue -> bool
which determines whether or not a Scheme symbol is a document annotation;

end-annotation : annotation -> annotation
which consumes an annotation and produces a matching ending; and

 write-file : (list-of atom) [string]-> void  
  
 which consumes a list of annotated symbols
  and prints them out as a "file"; it returns nothing. 
  if the string argument is present, it is interpreted as a file name: 
  the words are written to this file; if the file exists, it is deleted



Sample session: set teachpack to docs.ss  and execute:
> (annotation? 0)
#f
> (annotation? '<bold>)
#t
> (end-annotation 0)
end-annotation: not an annotation: 0
> (write-file (list 'a 'b))
a b