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01:57 jonrafkind: hwo do you force line breaks in a @title in scribble?
01:59 adu <3 scribble
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02:17 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/TYZUzA
02:17 RacketCommitBot: [racket/master] Improve docs for exn:fail:contract:blame - Asumu Takikawa
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03:11 RacketCommitBot: [racket/master] Reference: fix doc typos - Asumu Takikawa
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08:39 Noova: Hi, someone can tell me if I can Execute and Write in a ".exe" file at the same time with DrRacket ?
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08:54 soegaard: Noova: Does Windows allow this (in any programming language)?
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09:07 Cryovat: Whatever his use cae was, it sounds weird
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11:34 jesyspa: I'm implementing a programming language and am currently thinking about how to handle expressions.  Would using an expression class and then subtyping things like constant, function call, variable lookup, etc. make sense, or does Racket offer a more suitable facility?
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11:36 stamourv: jesyspa: Depending on what you're trying to do, you may want to check out Redex.
11:37 stamourv: It's great for experimenting with languages.
11:37 stamourv: But if you're trying to build an actual compiler, it may not be the best choice.
11:38 jesyspa: Thanks, will take a look.  I'm trying to build a compiler from a custom language to C++.
11:38 bremner: unusual choice of target
11:40 jesyspa: I'm trying to keep the code emitter decoupled enough to be able to change it later.  Might even switch to just using the Racket syntax manipulation features.
11:42 stamourv: jesyspa: To go back to your AST representation question, objects will work fine.
11:42 stamourv: Structs too.
11:43 jesyspa: Alright, thanks.
11:58 soegaard: Even syntax-objects :-)
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12:11 jesyspa: soegaard: Could you expand on that a little, please? :)
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12:13 soegaard: Syntax-objects are used to represent syntax. If you use the built-in lexer/parser it is easy to store and save source location in the syntax-objects. Other properties can be saved as syntax-properties.
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12:14 soegaard: However it might be cleaner to use normal structs.
12:15 soegaard: It is mighty convenient to use syntax-case and friends though - but it is very easy to loose syntax properties, if one is not careful.
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12:41 jesyspa: Hmm, alright, I'll keep it in mind.  I think I should make it work that way eventually, but I'd like to get into the nitty-gritty of writing a compiler first.
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15:55 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/macgnQ
15:55 RacketCommitBot: [racket/master] Fix doc typos - Asumu Takikawa
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16:07 yoklov: how much overhead does match have? any compared to the equivalent cond/let statement?
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16:09 stamourv: yoklov: Not much, I believe. `match' compiles down to `cond', so most of the action happens at expansion time.
16:10 asumu: match might even be faster in some cases. I notice that it uses unsafe list operations if it can show the thing is a list, for example.
16:11 yoklov: hm, interesting
16:11 asumu: (haven't tried to any experiments to see this myself, so I don't know)
16:11 yoklov: yeah, it's a performance critical piece of code, so i really should do some benchmarks
16:12 yoklov: well, performance critical within this program, at least.
16:15 jonrafkind: how do you split a @title into multiple lines in scribble?
16:15 jonrafkind: (other than hacks like add spaces)
16:22 aidy: How would one go about using racket to at first generate a fairly 1-to-1 conversion from s-expressions to say, C, and afterwards add macro functionality too?
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16:24 soegaard: aidy: Do you mean something like this?  https://www.cs.indiana.edu/cgi-pub/c311/lib/exe/fetch.php?media=parenthec.pdf
16:24 rudybot: http://tinyurl.com/6rj26oa
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16:33 stamourv: aidy: jonrafkind may know something about that.
16:34 jonrafkind: macros for C? hopeless
16:34 aidy: soegaard: not entirely, this is more like what I was thinking about: http://voodoo-slide.blogspot.be/2010/01/amplifying-c.html
16:35 aidy: or even http://ompldr.org/vZW1tNQ
16:36 aidy: not sure if that's a silly idea though
16:50 aidy: jonrafkind: would it still be hopeless for a C-with-list-syntax?
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17:03 yoklov: i don't see why it would be that hard
17:03 yoklov: there are plenty of scheme->c compilers
17:03 yoklov: and this is notably simpler
17:10 yoklov: is there any way to ask the macro stepper to expand a particular form?
17:10 yoklov: and not, say, the entire file?
17:10 yoklov: or to skip to where it starts expanding it?
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17:36 stamourv: yoklov: You can change the macro hiding setting in the pane at the bottom.
17:36 stamourv: s/setting/settings/
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18:03 jonrafkind: aidy, the issue is that C is context sensitive
18:03 jonrafkind: i have a macro processor for non-s-expression syntaxes but it would be hard to make it work for C
18:03 jonrafkind: if you are willing to change the syntax a bit (which I guess you are) then you could do something like var x:y; where x is the name and y is the type
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18:57 jsnikeri`: Hi all. Why are the internal definitions wrapped in a local expression here: http://docs.racket-lang.org/continue/index.html#%28part._.Advanced_.Control_.Flow%29
18:57 rudybot: http://tinyurl.com/6pm4mvg
18:58 jsnikeri`: Couldn't you just define those functions internally?
18:58 jonrafkind: yea
18:58 jonrafkind: no reason to use local there.
19:00 jsnikeri`: When would you need to use a local?
19:03 jonrafkind: at this point never, it predated the mixing of internal definitions and expressions. only the teaching languages still use local
19:03 jonrafkind: even before mixing definitions and expressions i never used local becuase you were always able to make internal definitions
19:04 jsnikeri`: jonrafkind: Ah, OK. Thanks. Should I prefer internal definitions to 'let'?
19:04 jonrafkind: yea
19:04 jonrafkind: let is still useful if you need to create a definition context. `begin' should have done that but its too late to change it now
19:05 jsnikeri`: jonrafkind: Interesting. Thanks for the background
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20:56 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/hc__Lw
20:56 RacketCommitBot: [racket/master] typo in error docs - Robby Findler
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