[MLton-devel] Fwd: Mark Tuttle

[Stephen Weeks]

> 1. Use ml-lex and ml-yacc that come with smlnj to do my parsing,
> instead of using mllex and mlyacc with mlton, to avoid rewriting the
> .lex and .grm files for yet another lex/yacc tool.
> 
> 2. Steal the HashTable implementation from smlnj.

I can answer these.

> 3.1.  BinIO is missing setPosOut, and BinIO.StreamIO is missing
> flushOut and getWriter,

Matthew, it looks to me like these three functions are there in the
new layered IO implementation.  I just checked in a few minor changes
to signatures to make them available.  With those changes, the
following program at least works.

------------------------------------------------------------
structure Word8Vector =
   struct
      open Word8Vector

      fun fromString s =
	 tabulate (String.size s, fn i =>
		   Byte.charToByte (String.sub (s, i)))
   end
val out = BinIO.openOut "/tmp/z.binio"
val pos = BinIO.getPosOut out
val _ = BinIO.output (out, Word8Vector.fromString "abc")
val _ = BinIO.setPosOut (out, pos)
val _ = BinIO.output (out, Word8Vector.fromString "def")
val _ = BinIO.closeOut out
------------------------------------------------------------

> I just need to write a 4G file, then write a few characters to the
> head of the file.  Is there an easy solution more efficient than a
> massive disk file copy?

I'm more worried about this.  Won't we fail on files longer than 2G
due to 32 bit signed ints?

> 3.2.  TextIO is missing openString.  I could write the string to a
> disk file and open the disk file, but is there a better way?

TextIO.openString also appears to be supported by the new TextIO.
I've checked in a few changes to switch to it.

Is there any reason why we shouldn't package a MLton with the new IO
libraries and these changes so that these guys can try it out?

> 3.3.  mlton does not appear to support antiquoting.  I can define an
> 'a frag datatype, and use the QUOTE and ANTIQUOTE constructors
> explicitly, but is there a better way?  Will there ever be support for
> the quasi-quoting notation?

Here I don't know what to say other than that there not there and we
don't have plans to add them.  Thoughts?


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