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digitalmars.D.learn - __FUNC__ in D

reply argl <cavenhaus gmail.com> writes:
Hi, I know this has come aup a few times in the past, but I have not come
across a clear answer.

Is it possible in any way to get the name of the current function for logging
purposes? Something to get the functionality of __FUNC__ in C?
Aug 13 2007
parent reply "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"argl" <cavenhaus gmail.com> wrote in message 
news:f9qrup$nqe$1 digitalmars.com...

 Hi, I know this has come aup a few times in the past, but I have not come 
 across a clear answer.

 Is it possible in any way to get the name of the current function for 
 logging purposes? Something to get the functionality of __FUNC__ in C?



No.
Aug 14 2007
parent reply BCS <ao pathlink.com> writes:
Reply to Jarrett,


 "argl" <cavenhaus gmail.com> wrote in message
 news:f9qrup$nqe$1 digitalmars.com...
 

 Hi, I know this has come aup a few times in the past, but I have not
 come across a clear answer.
 
 Is it possible in any way to get the name of the current function for
 logging purposes? Something to get the functionality of __FUNC__ in
 C?
 



 



CTFE anyone?

char[] GetLastFnDef(char[] file, int line);

use like this:

const char[] fn = GetLastFnDef(import(__FILE__), __LINE__);
Aug 14 2007
parent reply argl <me somewhere.com> writes:
That would be wonderful! 
I am getting the following errors though.
Where do I find GetLastFnDef() ?

dmd -Jpath -run ./test.d
test.d(80): Error: undefined identifier GetLastFnDef
test.d(80): Error: need -Jpath switch to import text file test.d
test.d(80): Error: function expected before (), not GetLastFnDef of type int
test.d(80): Error: cannot implicitly convert expression (GetLastFnDef("",80L))
of type int to char[]


BCS Wrote:


 Reply to Jarrett,
 

 "argl" <cavenhaus gmail.com> wrote in message
 news:f9qrup$nqe$1 digitalmars.com...
 

 Hi, I know this has come aup a few times in the past, but I have not
 come across a clear answer.
 
 Is it possible in any way to get the name of the current function for
 logging purposes? Something to get the functionality of __FUNC__ in
 C?
 



 



 CTFE anyone?
 
 char[] GetLastFnDef(char[] file, int line);
 
 use like this:
 
 const char[] fn = GetLastFnDef(import(__FILE__), __LINE__);
Aug 15 2007
parent reply argl <me somewhere.com> writes:
Sorry, stupid me forgot the declaration. I am still getting an error though.

dmd -J/tmp test3.d
test3.d(7): Error: cannot evaluate GetLastFnDef("import
tango.io.Stdout;\x0a\x0achar[] GetLastFnDef(char[] file, int line);\x0a\x0avoid
main()\x0a{\x0a    const char[] fn = GetLastFnDef(import(__FILE__),
__LINE__);\x0a    Stdout (\"hello {}\",
fn).newline;\x0a}\x0a\x0a\x0a\x0a\x0a",7) at compile time

Any help would be appreciated.

argl Wrote:


 That would be wonderful! 
 I am getting the following errors though.
 Where do I find GetLastFnDef() ?
 
 dmd -Jpath -run ./test.d
 test.d(80): Error: undefined identifier GetLastFnDef
 test.d(80): Error: need -Jpath switch to import text file test.d
 test.d(80): Error: function expected before (), not GetLastFnDef of type int
 test.d(80): Error: cannot implicitly convert expression (GetLastFnDef("",80L))
of type int to char[]
 
 
 BCS Wrote:
 

 Reply to Jarrett,
 

 "argl" <cavenhaus gmail.com> wrote in message
 news:f9qrup$nqe$1 digitalmars.com...
 

 Hi, I know this has come aup a few times in the past, but I have not
 come across a clear answer.
 
 Is it possible in any way to get the name of the current function for
 logging purposes? Something to get the functionality of __FUNC__ in
 C?
 



 



 CTFE anyone?
 
 char[] GetLastFnDef(char[] file, int line);
 
 use like this:
 
 const char[] fn = GetLastFnDef(import(__FILE__), __LINE__);
Aug 15 2007
parent reply BCS <BCS pathlink.com> writes:
argl wrote:

 Sorry, stupid me forgot the declaration. I am still getting an error though.
 
 dmd -J/tmp test3.d
 test3.d(7): Error: cannot evaluate GetLastFnDef("import
tango.io.Stdout;\x0a\x0achar[] GetLastFnDef(char[] file, int line);\x0a\x0avoid
main()\x0a{\x0a    const char[] fn = GetLastFnDef(import(__FILE__),
__LINE__);\x0a    Stdout (\"hello {}\",
fn).newline;\x0a}\x0a\x0a\x0a\x0a\x0a",7) at compile time
 
 Any help would be appreciated.
 
 argl Wrote:
 



It's a hypothetical function that doesn't exist (yet). However, it's 
shouldn't be two hard to wright one that would work for most case.
Aug 15 2007
parent reply argl <me somewhere.com> writes:
BCS Wrote:

 
 It's a hypothetical function that doesn't exist (yet). However, it's 
 shouldn't be two hard to wright one that would work for most case.



I see. Thank you.
Aug 15 2007
parent reply Regan Heath <regan netmail.co.nz> writes:
argl wrote:

 BCS Wrote:

 It's a hypothetical function that doesn't exist (yet). However, it's 
 shouldn't be two hard to wright one that would work for most case.



 I see. Thank you.



Quick and dirty!

import std.stdio, std.string, std.ctype;

alias std.string.tolower tolower;

void main()
{
	foo();
	bar();
	baz();
}

void foo()
{
	string fn = FnName(import(__FILE__), __LINE__);
	writefln(fn);
}

void bar ()
{
	string fn = FnName(import(__FILE__), __LINE__);
	writefln(fn);
}

const(char)baz ()
{
	string fn = FnName(import(__FILE__), __LINE__);
	writefln(fn);
	return cast(const(char))'c';
}

string FnName(string file, uint line)
{
	string name;
	string last;
	int    level;
	int    start;
	int    end;
	
	foreach(nLine, s; splitlines(file))
	{
		foreach(ref p; s.split())
		{
			if (p.contains(cast(const(char))'{')) level++;
			if (p.contains(cast(const(char))'}')) level--;
			if (level > 0) continue;
			if (p.contains(cast(const(char))'#')) continue;
			if (isKeyword(p)) continue;
			if (p.contains(cast(const(char))'('))
			{
				end = p.find('(');
				if (end == 0)
				{
					p = last;
					end = p.length;
				}
				
				for(start = end-1; start > 0; start--)
				{
					if (!isalnum(p[start]))
					{
						start++;
						break;
					}
				}
				
				name = p[start..end].dup;
			}
			last = p;
		}
		
		if (nLine > line) break;
	}
	
	return name;
}

bool isKeyword(string word)
{
	return keywords.contains(tolower(word));
}

bool contains(T)(T[] arr, T val)
{
	foreach(i; arr) if (i == val) return true;
	return false;
}

string[] keywords = [
	"abstract",
	"alias",
	"align",
	"asm",
	"assert",
	"auto",
	"body",
	"bool",
	"break",
	"byte",
	"case",
	"cast",
	"catch",
	"cdouble",
	"cent",
	"cfloat",
	"char",
	"class",
	"const",
	"continue",
	"creal",
	"dchar",
	"debug",
	"default",
	"delegate",
	"delete",
	"deprecated",
	"do",
	"double",
	"else",
	"enum",
	"export",
	"extern",
	"false",
	"final",
	"finally",
	"float",
	"for",
	"foreach",
	"foreach_reverse",
	"function",
	"goto",
	"idouble",
	"if",
	"ifloat",
	"import",
	"in",
	"inout",
	"int",
	"interface",
	"invariant",
	"ireal",
	"is",
	"lazy",
	"long",
	"macro",
	"mixin",
	"module",
	"new",
	"null",
	"out",
	"override",
	"package",
	"pragma",
	"private",
	"protected",
	"public",
	"real",
	"ref",
	"return",
	"scope",
	"short",
	"static",
	"struct",
	"super",
	"switch",
	"synchronized",
	"template",
	"this",
	"throw",
	"__traits",
	"true",
	"try",
	"typedef",
	"typeid",
	"typeof",
	"ubyte",
	"ucent",
	"uint",
	"ulong",
	"union",
	"unittest",
	"ushort",
	"version",
	"void",
	"volatile",
	"wchar",
	"while",
	"with",
	"__FILE__",
	"__LINE__",
	"__DATE__",
	"__TIME__",
	"__TIMESTAMP__",
	"__VENDOR__",
	"__VERSION__"
];
Aug 15 2007
parent reply Regan Heath <regan netmail.co.nz> writes:
On 2nd thought I think this only works by some sheer coincidence and fluke!

A better one could definately be written with the DMDFE.

Regan
Aug 15 2007
parent reply BCS <BCS pathlink.com> writes:
Regan Heath wrote:

 On 2nd thought I think this only works by some sheer coincidence and fluke!



The whole idea is a hack. Hacks are only /suposed/ to work when the user 
does things exactly right


 
 A better one could definately be written with the DMDFE.



yes but do you want to port DMDFE to run using CTFE?


 
 Regan
Aug 15 2007
parent reply Regan Heath <regan netmail.co.nz> writes:
BCS wrote:

 Regan Heath wrote:

 On 2nd thought I think this only works by some sheer coincidence and 
 fluke!



 The whole idea is a hack. Hacks are only /suposed/ to work when the user 
 does things exactly right



True.  There are many combinations which will break it, i.e.

const(char)
baz()

will get a function called "const", an extra check of p[start..end] 
using isKeyword would fix a few of these sorts of problems.


 A better one could definately be written with the DMDFE.



 yes but do you want to port DMDFE to run using CTFE?



Actually I think I have some code to lex C/C++ here somewhere and with 
very few changes it would lex D just as well.  That would be easier that 
using a full blown DMDFE port.  I might see what I can whip up tomorrow 
(it's 11pm here).

Regan
Aug 15 2007
parent argl <me somewhere.com> writes:
Amazing! I greatly appreciate your help!
Aug 15 2007