World: r3wp

as long as there are no dead ends with truly unrecoverable errors...

Volker - but how does it know of 29-Feb-2006? Under some condition, 
it is valid date ... imo already higher level logic is applied here, 
no?

- btw - from my pov, regard this discussion academic .... I don't 
understand compilers, interpreters, just speculating here :-)

quick question ... I have a number of simple objects that I create 
on the web server and then send back to client in molded format.

how does one restore them back to objects?

If I load them, I just get a block

mold/all

uses some extra syntax.

ok, let me try :)

Pekr, the only thing to know is that all code is loaded and checked 
for syntax, and then executed. and before execution 'try has no real 
meaning, it could be"the" 'try, or a local or style or something. 
when 'do does the code it does no longer know the original source. 
So 'load has to report errors on its own.

page: read http://www.compkarori.com/cgi-local/show-templates.r

parse page [ thru <templates> copy code to </templates> ]

Btw rebol cheats and uses a calendar ;)>> 29-feb-2004
== 29-Feb-2004
>> 29-feb-2005
** Syntax Error: Invalid date -- 29-feb-2005
** Near: (line 1) 29-feb-2005

seems to work ...

thanks.

np. the "#[object! [" does the magic.

Volker - isn't checking against the calendar too preliminary during 
the state of code load? :-)

No, thats the basic equpment of a god loader. pda and such ;)

:-)

even a cell phone? probably so :-)

in the case of tuple, is that kind of binary given, that the value 
can't be larger than 255?

*riing* "Hi" - "This isnt a date, you know?" :)

Yes.

upto 12 bytes  out the 16 AFAIK.

so tuples can't be used for things like coordinaty space?

No.

Coimplex things need objects.

Until Carl finds a clever magic new way to keep performance. :)

hmm, we have pair for such things ...

I wonder if tuples should allow rotation?

the advantage is, the memory-layout is known, so the interpreter 
has an easier job.

Hmm, shifting would be nice. I use them for version-numbers and colors, 
so i dont need rotation. but getting at thepart with the os would 
help. What usage benefits from rotation?

dunno, but I saw someone mentioning the need for it already ...

A language is not there to solve any particular needs, but to solve 
the needs of most of us

Not the original sentence, but Carl said something like that, one 
day (maybe in a blog, or what is Altme?).

As a comment, try "29/02/2006" in Excel and it will give you a nice 
"text" value, not a date value.
Don't expect 'load to make this kind of choice !

Petr, it's not "non recoverable", it's perfectly recoverable, you're 
just trying to recover when it is too late.

load must make sure that the date is correct, because it must convert 
it to the internal format. 29-Feb-2006 simply cannot be converted 
and thus cannot be loaded.

Pekr: "I am not talking about string..." - Wrong! You are talking 
about string but refuse to admit it. Every source code is a string 
before LOAD transforms it to a block. (see my articles on this)

Like Pekr, I am confused here. It would seem that if the loader cannot 
convert a value into the internal format, then it should have a fall 
back of loading it as a string. Other values that Rebol can't convert 
to an internal datatype should convert it to a string to be consistent.

That would cause rather strange bugs. Quite often, you wouldn't notice 
that you had made a syntax error. How would you know whether a string 
was an incorrectly written date or just some other string ? eg:  
How could you tell whether   "jan 12"  was intended to be a date! 
or not ? Maybe it's somebody's name and age in a string.

I am completely happy with the way load works in this regard. A given 
date string must comply with the rebol syntax and have valid sub-values 
otherwise I don't want it. If messy data is coming in, just catch 
errors loading it from a string. Simple.

Petr, 29-Feb-2006 is always an invalid date. You can't say "Under 
some condition it could be even valid date (leap year)" because the 
year 2006 is specified in that date, and 2006 is not a leap year.


Data types have syntactic forms and semantic constraints. In order 
for the loader to recognize the data type, the syntactic form must 
be followed. In order for the resulting data to be valid, the semantic 
constraints must be obeyed. One such constraint is that date! values 
must correspond to a date on the calendar. Semantic violations are 
the bugs that all of that nasty exploit code does its job.

Sorry, "code uses to do its job."

Well, I checked with my paper-based calendar, and it isn't able to 
hancle 2006-02-29 either.So it may be OK that way ;-)

load-relaxed: func [string /local res sp parseblk] [
    sp: charset " ^/^-"
    parseblk: func [blk string /local val] [
        parse string [
            some [

                #"[" string: (string: parseblk val: make block! 16 string append/only 
                blk val) :string
                |

                #"(" string: (string: parseblk val: make paren! 16 string append/only 
                blk val) :string
                |

                #"]" string: (either block? blk [return string] [append blk "]"])
                |

                #")" string: (either paren? blk [return string] [append blk ")"])
                |

                string: skip (either error? try [set [val string] load/next string] 
                [

                    append blk copy/part string string: any [find string sp tail string]
                ] [
                    append blk :val
                ]) :string
            ]
        ]
        string
    ]
    parseblk res: make block! 16 string
    res
]

>> load-relaxed {10-Feb-2006 20-Feb-2006 29-Feb-2006 1-Mar-2006}
== [10-Feb-2006 20-Feb-2006 "29-Feb-2006" 1-Mar-2006]

>> load-relaxed {10-Feb-2006 20-Feb-2006 [29-Feb-2006 1-Mar-2006]}
== [10-Feb-2006 20-Feb-2006 ["29-Feb-2006" 1-Mar-2006]]

(just to give an idea)

thanks :-)

so... what are you going to do with "29-Feb-2006" ?

hmm, why send/attach sends jpeg in some non standard way? When I 
normally receive jpeg, first it is related to jpeg icon, second it 
is displayed in my email directly ....