Re: string function: definition of a function

[Petr M. <mi...@ph...>]

> > > I propose the patch below, which adds a function that returns the
> > > string that defines a specified user defined function.
> 
> I have committed the code that Ethan Merritt posted.  I may commit my
> original implementation of definition() as well, if only because I can
> touch type that faster (no upper case :-).

Then it could be like
	definition('f', 0)
		=> a*x+y
	definition('f', 1)
		=> f(x)=a*x+y

> > I thought there are some "string" functions that could allow this,
> > but it seems we don't have "string index" or "string split"
> > functions.  Maybe it would be also useful to have
> >	   strindex("hello world", "llo")  => 3
>
> tokens are separated by one or more characters from that string,
> and the separators found are returned.  E.g.
>          strsplit("hello, world", " ;," , 1) => ", "
>          strsplit("hello, world", " ;," , 2) => "world"
>          strsplit("hello, world",   "," , 1) => ","
>          strsplit("hello, world",   "," , 2) => " world"

Yes, by awk. I propose to start with 1 as it is currently used in
	print word("a b c d e", 1)
		=> "a"
	print substr("hello", 1,99)
		=> "hello"

I think it would be sufficient not to return separators
         strsplit("hello, world, ahoj, svete", ",", 1) => "hello"
         strsplit("hello, world, ahoj, svete", ",", 2) => "hello"
         strsplit("hello, world, ahoj, svete", ",", 3) => "ahoj"
         strsplit("hello, world, ahoj, svete", ",", 4) => "ahoj"
and this would also need
         strsplitn("hello, world, ahoj, svete", ",") => 4

> To go along with strindex, I would also like to see:
>          substr(string, index, length)

This exists, see above.

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PM