Hallo Michael,
Du schriebst am Wed, 20 Nov 2013 11:45:56 +0100:
> > _No_ language can make certain that a preprocessor cannot be used.
> It can make use of the preprocessor syntax itself (e.g. requiring a # at
> the start of a line for some purpose)
No, it _cannot_, because these syntactic elements are _removed_ by the
preprocessor. The (real) language processor doesn't "see" them at all.
(BTW, the C preprocessor doesn't _require_ the "#" to be at the beginning
of a line, just in front of its keyword - and it _may_ even be separated by
whitespace from the one it _belongs_ to - weird.)
> > _No_ language should depend on the use of a preprocessor.
> Right.
You _do_ say?
...
> call cpp as a stand alone preprocessor and failed, but succeeding when
You might have called it with the wrong syntax. "cpp --help" gives a long
list of options and a description of how to use it.
> > Well, what you write only asks for one single thing: "C".
> I suppose for C this is documented somewhere. Did you find a
> documentation for some Pascal dialect that contradicts the assumption
> that it should work that way ?
There are several things there that are syntactic errors in Pascal code,
at least, of course, if not removed by some program processing the code
prior to compiling it:
- Pascal doesn't accept lone "#" characters
- Pascal doesn't know the "\" line continuation convention
- Pascal doesn't use "/*" and "*/" as comment delimiters
- Pascal doesn't use "//" as a comment delimiter
(although this was introduced as an extension by Delphi & FPC)
(BTW, there are other styles for single line comments also, e.g.
ADA uses "--", and some FORTHs use "\".)
The remaining "requirements" you stated are very common for any programming
language, even for common languages, at least such using the "latin" based
writing system.
> Of course the origin of the preprocessor is the needs of C programmers,
> but as Martin will not be writing a new preprocessor, there is no way
> but using same (if somebody might be in need for this).
You could use _any_ program as a preprocessor, even a perl script or awk
program, or even something written in Pascal.
> > The C preprocessor has developed into a gargantuan monster never
> > conceived to do what is was made to do.
>
> It is a perfect example on how an algorithm that can be defined in just
> a few lines can be used to do very complex stuff.
How big is this "C preprocessor" you're referring to? The one called "cpp"
on my system is ove half a megabyte in size - machine code, that is.
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Mit freundlichen Grüßen, S. Schicktanz
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