crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

Claudio Holanda

@kazzkiq

I'm trying something like that, without success:

data = NamedTuple.new(name: String, nickname: String)

data[:name] = name.to_s if name #only assign if name exists
data[:nickname] = nickname.to_s if nickname #only assign if nickname exists

From IRC (bridge bot)

@FromIRC

<Papierkorb> In best case, not at all

<Papierkorb> NamedTuple are immutable data structures, with keys known at compile-time.

<Papierkorb> If you need something mutable, use a Hash

Claudio Holanda

@kazzkiq

Hmmmm, will try that.

Rubi

@codenoid

PCRE does not support \L, \l, \N{name}, \U, or \u at 2

piperun

@piperun

Hello everyone, I'm a little curious about crystal, as far as I know it's a compiled language but I'm wondering if it's possible to use Crystal as a script language in say making video games?

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@FromIRC

<tosmi> hi, i'm trying to compile crystal on freebsd 10.3

<tosmi> following the comment in crystal-lang/crystal#4185, i'm using the 0.19 freebsd binary to build 0.20.0

<tosmi> gmake works, but call gmake spec or running gmake a second time yields the following error message

<tosmi> https://gist.github.com/tosmi/5d48acecece6e2e581b8267fc2141a94

<tosmi> any hints what i'm donig wrong here? thanks

Bar Hofesh

@bararchy

@piperun there are more then a few people doing game development in Crystal , I don't really understand the Script part in the question though

Johannes Müller

@straight-shoota

I think @piperun want's to use Crystal as an interpreted language to easily allow custom modifications.

This would be very difficult and probably not really helpful, because Crystal's type inference for example needs to assess the whole program and not just parts of it.

Johannes Müller

@straight-shoota

@tosmi I don't know if it helps, but does src/lib_c/x86_64-portbld-freebsd/c/dlfcn.cr exist?

Oh I see you figured that^^

piperun

@piperun

@straight-shoota I see, thanks for the input!

Johannes Müller

@straight-shoota

you could probably better use Lua (or somthing similar, maybe mruby). This language was explicitly designed for such tasks. IIRC there are Crystal bindings for liblua.

https://github.com/veelenga/lua.cr

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@FromIRC

<tosmi> got 0.20.0 to compile after renaming lib_c/x86_64-portbld-freebsd to lib_c/x86_64-unknown-freebsd

<tosmi> but now 0.20.1 fails with in src/compiler/crystal/compiler.cr:155: undefined method 'merge!' for Set(String) (did you mean 'merge'?)

<tosmi> any hints?

Akzhan Abdulin

@akzhan

@tosmi to to use usual crystal cpmiler with cross-compile to x86_64-unknown-freebsd triple

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@FromIRC

<tosmi> with changing the dir (creating a link) it failed with https://gist.github.com/tosmi/5d48acecece6e2e581b8267fc2141a94

<tosmi> ^with^without

Akzhan Abdulin

@akzhan

Strange. dlfcn should be found in triple files (add_target_path responds to this behavior).

Anyway you should upgrade your crystal o 0.22.x at least

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@FromIRC

<tosmi> the thing is i try to get the latest version compiled, but i have to start with 0.19, that was the latest release providing freebsd binaries

<tosmi> but it seems i'm too stupid for this

<tosmi> compiling 0.20.0 with 0.19 worked (after fixing the dir) but compiling 0.20.1 with 0.20.0 failed with the merge error message

Akzhan Abdulin

@akzhan

can you cross compile crystal on another platform to yours one?

https://crystal-lang.org/docs/syntax_and_semantics/cross-compilation.html

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@FromIRC

<tosmi> ok, i could try that as well

<tosmi> but it seems my problem is related with the crystal standard library

<tosmi> maybe there's no merge! for Set(string) in 0.20.0 but 0.20.1 uses this

<tosmi> so how do i compile crystal 0.20.1 with 0.20.0?

Akzhan Abdulin

@akzhan

it looks like you got wrong source code: 0.20.1 stdlib introduces merge! method

Johannes Müller

@straight-shoota

but you should be able to compile 0.20.1 with 0.20.0

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@FromIRC

<tosmi> i'm using bash here and after compiling 0.20.0 i did a export PATH=.../crystal-0.20.0/bin and tried to compile 0.20.1

<tosmi> seems to be wrong...

<tosmi> so my workflow is setting the path, changing to the new crystal version and running gmake

Johannes Müller

@straight-shoota

I guess you could just keep everything in the same directory... make builds compiler into .build/crystal, then checkout next release and make uses .build/crystal from previous build

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@FromIRC

<tosmi> @straight-shoota: thanks! looks like that's the issue here. i will try that a little bit later

Elias Perez

@eliasjpr

Does crystal have throw/catch control flow?

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@FromIRC

<oprypin> @eliasjpr, is called raise/rescue https://crystal-lang.org/docs/syntax_and_semantics/exception_handling.html

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@FromIRC

<ANon1543> Just out of curiousity: nullpointer, nil and false are considered the only falsey. so 0 is also considered a truthy value?

<Papierkorb> yes

<ANon1543> that....feels weird

<Papierkorb> Coming from C/C++?

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