Re: Playing arround with mixin - alias?
Martin Tschierschke wrote:
i doubt so.
So my "solution" on how to get a short cut for using:
writeln(mixin(interp!"${name} you are app. ${age*365} days old"));
..
NEVER. EVER. USE. THE. FOLOWING. IN. YOUR. CODE.
NEVER!!!
import std.stdio;
mixin template usesexpand() {
import std.format : format;
string sexpand1(string s) () {
char[] res;
res.length = s.length+1024;
auto rused = res.length;
auto rpos = rused*0; // i really HAET `size_t`!
void put(bool escape=true) (const(char)[] s...) {
foreach (char ch; s) {
static if (escape) {
if (ch == '"' || ch == '\\') {
if (rpos == rused) { rused +=
1024; res.length = rused; }
res[rpos++] = '\\';
}
}
if (rpos == rused) { rused += 1024; res.length
= rused; }
res[rpos++] = ch;
}
}
char[] fmt;
fmt.length = 256;
auto fused = fmt.length;
auto fpos = fused*0; // i really HAET `size_t`!
void putfmt (const(char)[] s...) {
foreach (char ch; s) {
if (fpos == fused) { fused += 1024; fmt.length
= fused; }
fmt[fpos++] = ch;
}
}
putfmt(`format("`);
auto pos = rpos, epos = rpos;
pos = 0;
while (pos < s.length) {
epos = pos;
while (epos < s.length && s[epos] != '$') ++epos;
putfmt("%s");
put!false(`, "`);
if (epos+1 >= s.length || s[epos+1] != '{') {
put(s[pos..epos+1]);
put!false(`"`);
pos = epos+1;
continue;
}
put(s[pos..epos]);
put!false(`"`);
pos = epos+2;
while (epos < s.length && s[epos] != '}') ++epos;
if (epos > pos) {
putfmt("%s");
put(`, `);
put(s[pos..epos]);
}
pos = epos+1;
}
put(`)`);
putfmt(`"`);
return cast(string)fmt[0..fpos]~cast(string)res[0..rpos]; // it
is safe to cast here
}
enum sexpandstr(string s) = sexpand1!s;
enum sexpand(string s) = mixin(sexpand1!s);
void echo(string s) () { writeln(mixin(sexpand1!s)); }
}
mixin usesexpand;
immutable n = 40;
enum nstr = sexpand!"n is ${n+2}";
void main () {
mixin usesexpand;
int a = 42/2;
echo!"a is ${a*2}"; //writeln(mixin(sexpandstr!"a is ${a*2}"));
writeln(nstr);
}
Re: Playing arround with mixin - alias?
On Friday, 21 April 2017 at 11:58:13 UTC, Martin Tschierschke
wrote:
On Friday, 21 April 2017 at 10:31:46 UTC, ketmar wrote:
biozic wrote:
I thought way to complicated:
Just define the string at top:
enum exho="auto mixinter(string x)(){return mixin(interp!x);}
auto exho(string x)(){return
mixin(\"writeln(\"~interp!x~\")\");}";
Then use:
mixin(exho);
exho!"${name} you are app. ${age*365} days old";
In your scope!
Re: Playing arround with mixin - alias?
On Friday, 21 April 2017 at 10:31:46 UTC, ketmar wrote:
biozic wrote:
On Friday, 21 April 2017 at 09:42:33 UTC, ketmar wrote:
Martin Tschierschke wrote:
Is it possible to define an alias for something like
mixin(import("local_function_file.d"));
to write only
use_local_function;
which will be translated to:
mixin(import("local_function_file.d"));
(this additionally needs the file local_function_file.d in
source/ +
-J./source as parameter for dmd aka. dflags "-J./source" in
dub.sdl)
Regards mt.
nope. the best you can get is `mixin use_local_function;`.
Would there be an advantage compared to a simple `import
local_function_file;`?
i doubt so.
So my "solution" on how to get a short cut for using:
writeln(mixin(interp!"${name} you are app. ${age*365} days old"));
// first place in source/exho.d the following code:
auto mixinter(string x)(){return mixin(interp!x);}
auto exho(string x)(){return mixin("writeln("~interp!x~")");}
later compile this with -J./source
source/app.d:
import scriptlike;
auto insert(string name)(){return import(name);}
alias insert!"exho.d" use_exho;
void main()
{
auto name = userInput!string("Please enter your name");
auto age = userInput!int("And your age");
//Now you can write in every scope you need it:
mixin(use_exho);
exho!"${name} you are app. ${age*365} days old";
// Which looks little nicer than:
// writeln(mixin(interp!"${name} you are app. ${age*365} days
old"));
// or if you need the result in a var:
mixin(use_exho);
auto var = mixinter!"${name} you are app. ${age*365} days old";
writeln(var);
}
you may even name the alias just exho and write:
alias insert!"exho.d" exho;
mixin(exho);
exho!"${name} you are app. ${age*365} days old";
(exho was derived from shell echo with mi_x_in)
Re: Playing arround with mixin - alias?
biozic wrote:
On Friday, 21 April 2017 at 09:42:33 UTC, ketmar wrote:
Martin Tschierschke wrote:
Is it possible to define an alias for something like
mixin(import("local_function_file.d"));
to write only
use_local_function;
which will be translated to: mixin(import("local_function_file.d"));
(this additionally needs the file local_function_file.d in source/ +
-J./source as parameter for dmd aka. dflags "-J./source" in dub.sdl)
Regards mt.
nope. the best you can get is `mixin use_local_function;`.
Would there be an advantage compared to a simple `import
local_function_file;`?
i doubt so.
Re: Playing arround with mixin - alias?
On Friday, 21 April 2017 at 09:42:33 UTC, ketmar wrote:
Martin Tschierschke wrote:
Is it possible to define an alias for something like
mixin(import("local_function_file.d"));
to write only
use_local_function;
which will be translated to:
mixin(import("local_function_file.d"));
(this additionally needs the file local_function_file.d in
source/ +
-J./source as parameter for dmd aka. dflags "-J./source" in
dub.sdl)
Regards mt.
nope. the best you can get is `mixin use_local_function;`.
Would there be an advantage compared to a simple `import
local_function_file;`?
Re: Playing arround with mixin - alias?
Martin Tschierschke wrote:
Is it possible to define an alias for something like
mixin(import("local_function_file.d"));
to write only
use_local_function;
which will be translated to: mixin(import("local_function_file.d"));
(this additionally needs the file local_function_file.d in source/ +
-J./source as parameter for dmd aka. dflags "-J./source" in dub.sdl)
Regards mt.
nope. the best you can get is `mixin use_local_function;`.
i'm assuming that you want your imported function behave like normally
declared function here.
Playing arround with mixin - alias?
Is it possible to define an alias for something like
mixin(import("local_function_file.d"));
to write only
use_local_function;
which will be translated to:
mixin(import("local_function_file.d"));
(this additionally needs the file local_function_file.d in
source/ +
-J./source as parameter for dmd aka. dflags "-J./source" in
dub.sdl)
Regards mt.
