string escape function available?

[Patrick R. Michaud]

Is there some opcode or function built into the standard parrot
distribution that will print a string with appropriate escapes
around special characters (i.e., display newlines as '\n',
returns as '\r', non-printable characters as '\xnn' or '\nnn', etc.)?

I can certainly write a function to do this, but would be very glad
to take advantage of any that's already available.

Thanks,

Pm

[William Coleda]

Data::Escape is probably your best bet.

.sub _main

load_bytecode "runtime/parrot/library/Data/Escape.pbc"
.local pmc escaper
escaper = find_global "Data::Escape", "String"

$S0 = "\n"
$S1 = escaper($S0, "\"")
print $S1
print $S0

end
.end

[Leopold Toetsch]

William Coleda <wi...@coleda.com> wrote:
> Data::Escape is probably your best bet.

> .sub _main

> load_bytecode "runtime/parrot/library/Data/Escape.pbc"
^^^^^^^^^^^^^^^

Just drop that prefix - "library/foo" ought to do it.

leo

[Patrick R. Michaud]

On Sun, Nov 21, 2004 at 07:48:03PM +0100, Leopold Toetsch wrote:
> William Coleda <wi...@coleda.com> wrote:
> > Data::Escape is probably your best bet.

Good bet, thanks.

> > .sub _main
> > load_bytecode "runtime/parrot/library/Data/Escape.pbc"
> ^^^^^^^^^^^^^^^
> Just drop that prefix - "library/foo" ought to do it.

On my machine 'library/foo' doesn't seem to be sufficient -- I have
to provide a complete path (relative or absolute) to the resource.
Or is there some other environment variable or the like that I should
have set?

[pmichaud@localhost parrot]$ cat esc.pir
.sub _main
load_bytecode 'library/Data/Escape.pbc'
$P0 = find_global "Data::Escape", "String"

$S0 = $P0("hello\nthere\n", '"')
print $S0
print "\n"
.end
[pmichaud@localhost parrot]$ parrot esc.pir
Parrot VM: Can't stat library/Data/Escape.pbc, code 2.
Segmentation fault
[pmichaud@localhost parrot]$ uname -a
Linux localhost.localdomain 2.4.20-31.9 #1 Tue Apr 13 18:04:23 EDT 2004 i686 i686 i386 GNU/Linux

Pm

[Leopold Toetsch]

Patrick R. Michaud <pmic...@pobox.com> wrote:
> On Sun, Nov 21, 2004 at 07:48:03PM +0100, Leopold Toetsch wrote:
>> William Coleda <wi...@coleda.com> wrote:

>> > .sub _main
>> > load_bytecode "runtime/parrot/library/Data/Escape.pbc"
>> ^^^^^^^^^^^^^^^
>> Just drop that prefix - "library/foo" ought to do it.

> On my machine 'library/foo' doesn't seem to be sufficient -- I have
> to provide a complete path (relative or absolute) to the resource.

Argh, yes. Loading bytecode didn't search the library paths. Fixed.

BTW still patches wanted that check the filename, if it's absolute.

> Pm

leo