8de5b49cdf 2010-11-09        kinaba: /**
8de5b49cdf 2010-11-09        kinaba:  * Authors: k.inaba
8de5b49cdf 2010-11-09        kinaba:  * License: NYSL 0.9982 http://www.kmonos.net/nysl/
8de5b49cdf 2010-11-09        kinaba:  *
8de5b49cdf 2010-11-09        kinaba:  * Common tricks and utilities for programming in D.
8de5b49cdf 2010-11-09        kinaba:  */
8de5b49cdf 2010-11-09        kinaba: module tricks.tricks;
8de5b49cdf 2010-11-09        kinaba: import tricks.test;
8de5b49cdf 2010-11-09        kinaba: import std.array      : appender;
8de5b49cdf 2010-11-09        kinaba: import std.format     : formattedWrite;
8de5b49cdf 2010-11-09        kinaba: import core.exception : AssertError;
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Simple Wrapper for std.format.doFormat
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: string sprintf(string fmt, T...)(T params)
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	auto writer = appender!string();
8de5b49cdf 2010-11-09        kinaba: 	formattedWrite(writer, fmt, params);
8de5b49cdf 2010-11-09        kinaba: 	return writer.data;
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: unittest
8de5b49cdf 2010-11-09        kinaba: {
7de80acfb8 2010-11-09        kinaba: 	assert_eq( sprintf!"%s == %04d"("1+2", 3), "1+2 == 0003" );
7de80acfb8 2010-11-09        kinaba: 	assert_eq( sprintf!"%2$s == %1$s"("1+2", 5, 8), "5 == 1+2" );
7de80acfb8 2010-11-09        kinaba: 	assert_throw!Error( sprintf!"%s%s"(1) );
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Create an exception with automatically completed filename and lineno information
8de5b49cdf 2010-11-09        kinaba: 
38fcc662be 2010-11-10        kinaba: ExceptionType genex(ExceptionType, string fn=__FILE__, int ln=__LINE__, T...)(T params)
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	static if( T.length > 0 && is(T[$-1] : Throwable) )
8de5b49cdf 2010-11-09        kinaba: 		return new ExceptionType(params[0..$-1], fn, ln, params[$-1]);
8de5b49cdf 2010-11-09        kinaba: 	else
8de5b49cdf 2010-11-09        kinaba: 		return new ExceptionType(params, fn, ln);
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: unittest
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	assert_ne( genex!Exception("msg").file, "" );
8de5b49cdf 2010-11-09        kinaba: 	assert_ne( genex!Exception("msg").line, 0 );
8de5b49cdf 2010-11-09        kinaba: 	assert_ne( genex!Exception("msg",new Exception("bar")).next, Exception.init );
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Mixing-in the bean constructor for a class
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /*mixin*/
8de5b49cdf 2010-11-09        kinaba: template SimpleConstructor()
8de5b49cdf 2010-11-09        kinaba: {
38fcc662be 2010-11-10        kinaba: 	/// member-by-member constructor
8de5b49cdf 2010-11-09        kinaba: 	static if( is(typeof(super) == Object) || super.tupleof.length==0 )
8de5b49cdf 2010-11-09        kinaba: 		this( typeof(this.tupleof) params )
8de5b49cdf 2010-11-09        kinaba: 		{
8de5b49cdf 2010-11-09        kinaba: 			static if(this.tupleof.length>0)
8de5b49cdf 2010-11-09        kinaba: 				this.tupleof = params;
8de5b49cdf 2010-11-09        kinaba: 		}
8de5b49cdf 2010-11-09        kinaba: 	else
8de5b49cdf 2010-11-09        kinaba: 		this( typeof(super.tupleof) ps, typeof(this.tupleof) params )
8de5b49cdf 2010-11-09        kinaba: 		{
8de5b49cdf 2010-11-09        kinaba: 			// including (only) the direct super class members
8de5b49cdf 2010-11-09        kinaba: 			// may not always be a desirable choice, but should work for many cases
8de5b49cdf 2010-11-09        kinaba: 			super(ps);
8de5b49cdf 2010-11-09        kinaba: 			static if(this.tupleof.length>0)
8de5b49cdf 2010-11-09        kinaba: 				this.tupleof = params;
8de5b49cdf 2010-11-09        kinaba: 		}
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: unittest
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	class Temp
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		int x;
8de5b49cdf 2010-11-09        kinaba: 		string y;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Temp(1,"foo")).x, 1 );
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Temp(1,"foo")).y, "foo" );
8de5b49cdf 2010-11-09        kinaba: 	assert( !__traits(compiles, new Temp) );
8de5b49cdf 2010-11-09        kinaba: 	assert( !__traits(compiles, new Temp(1)) );
8de5b49cdf 2010-11-09        kinaba: 	assert( !__traits(compiles, new Temp("foo",1)) );
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: 	class Tomp : Temp
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		real z;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Tomp(1,"foo",2.5)).x, 1 );
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Tomp(1,"foo",2.5)).y, "foo" );
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Tomp(1,"foo",2.5)).z, 2.5 );
8de5b49cdf 2010-11-09        kinaba: 	assert( !__traits(compiles, new Tomp(3.14)) );
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: 	// shiyo- desu. Don't use in this way.
8de5b49cdf 2010-11-09        kinaba: 	//   Tamp tries to call new Tomp(real) (because it only sees Tomp's members),
8de5b49cdf 2010-11-09        kinaba: 	//   but it fails because Tomp takes (int,string,real).
8de5b49cdf 2010-11-09        kinaba: 	assert( !__traits(compiles, {
38fcc662be 2010-11-10        kinaba: 		class Tamp : Tomp { mixin SimpleConstructor; }
8de5b49cdf 2010-11-09        kinaba: 	}) );
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Mixing-in the MOST-DERIVED-member-wise comparator for a class
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /*mixin*/
8de5b49cdf 2010-11-09        kinaba: template SimpleCompare()
8de5b49cdf 2010-11-09        kinaba: {
38fcc662be 2010-11-10        kinaba: 	override bool opEquals(Object rhs_) const /// member-by-member equality
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		if( auto rhs = cast(typeof(this))rhs_ )
8de5b49cdf 2010-11-09        kinaba: 		{
8de5b49cdf 2010-11-09        kinaba: 			foreach(i,_; this.tupleof)
8de5b49cdf 2010-11-09        kinaba: 				if( this.tupleof[i] != rhs.tupleof[i] )
8de5b49cdf 2010-11-09        kinaba: 					return false;
8de5b49cdf 2010-11-09        kinaba: 			return true;
8de5b49cdf 2010-11-09        kinaba: 		}
8de5b49cdf 2010-11-09        kinaba: 		assert(false, sprintf!"Cannot compare %s with %s"(typeid(this), typeid(rhs_)));
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 
38fcc662be 2010-11-10        kinaba: 	override hash_t toHash() const /// member-by-member hash
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		hash_t h = 0;
8de5b49cdf 2010-11-09        kinaba: 		foreach(mem; this.tupleof)
8de5b49cdf 2010-11-09        kinaba: 			h += typeid(mem).getHash(&mem);
8de5b49cdf 2010-11-09        kinaba: 		return h;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 
38fcc662be 2010-11-10        kinaba: 	override int opCmp(Object rhs_) const /// member-by-member compare
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		if( auto rhs = cast(typeof(this))rhs_ )
8de5b49cdf 2010-11-09        kinaba: 		{
8de5b49cdf 2010-11-09        kinaba: 			foreach(i,_; this.tupleof)
8de5b49cdf 2010-11-09        kinaba: 				if(auto c = typeid(_).compare(&this.tupleof[i],&rhs.tupleof[i]))
8de5b49cdf 2010-11-09        kinaba: 					return c;
8de5b49cdf 2010-11-09        kinaba: 			return 0;
8de5b49cdf 2010-11-09        kinaba: 		}
8de5b49cdf 2010-11-09        kinaba: 		assert(false, sprintf!"Cannot compare %s with %s"(typeid(this), typeid(rhs_)));
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: unittest
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	class Temp
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		int x;
8de5b49cdf 2010-11-09        kinaba: 		string y;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleCompare;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( new Temp(1,"foo"), new Temp(1,"foo") );
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Temp(1,"foo")).toHash, (new Temp(1,"foo")).toHash );
8de5b49cdf 2010-11-09        kinaba: 	assert_ne( new Temp(1,"foo"), new Temp(2,"foo") );
8de5b49cdf 2010-11-09        kinaba: 	assert_ne( new Temp(1,"foo"), new Temp(1,"bar") );
8de5b49cdf 2010-11-09        kinaba: 	assert_gt( new Temp(1,"foo"), new Temp(1,"bar") );
8de5b49cdf 2010-11-09        kinaba: 	assert_lt( new Temp(1,"foo"), new Temp(2,"bar") );
8de5b49cdf 2010-11-09        kinaba: 	assert_ge( new Temp(1,"foo"), new Temp(1,"foo") );
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: 	class TempDummy
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		int x;
8de5b49cdf 2010-11-09        kinaba: 		string y;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleCompare;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 	assert_throw!AssertError( new Temp(1,"foo") == new TempDummy(1,"foo") );
8de5b49cdf 2010-11-09        kinaba: 	assert_throw!AssertError( new Temp(1,"foo") <= new TempDummy(1,"foo") );
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Mixing-in a simple toString method
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /*mixin*/
8de5b49cdf 2010-11-09        kinaba: template SimpleToString()
8de5b49cdf 2010-11-09        kinaba: {
38fcc662be 2010-11-10        kinaba: 	/// member-by-member toString
8de5b49cdf 2010-11-09        kinaba: 	override string toString()
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		string str = sprintf!"%s("(typeof(this).stringof);
8de5b49cdf 2010-11-09        kinaba: 		foreach(i,mem; this.tupleof)
8de5b49cdf 2010-11-09        kinaba: 		{
8de5b49cdf 2010-11-09        kinaba: 			if(i) str ~= ",";
8de5b49cdf 2010-11-09        kinaba: 			static if( is(typeof(mem) == std.bigint.BigInt) )
8de5b49cdf 2010-11-09        kinaba: 				str ~= std.bigint.toDecimalString(mem);
8de5b49cdf 2010-11-09        kinaba: 			else
8de5b49cdf 2010-11-09        kinaba: 				str ~= sprintf!"%s"(mem);
8de5b49cdf 2010-11-09        kinaba: 		}
8de5b49cdf 2010-11-09        kinaba: 		return str ~ ")";
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: version(unittest) import std.bigint;
8de5b49cdf 2010-11-09        kinaba: unittest
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	class Temp
8de5b49cdf 2010-11-09        kinaba: 	{
8de5b49cdf 2010-11-09        kinaba: 		int x;
8de5b49cdf 2010-11-09        kinaba: 		string y;
8de5b49cdf 2010-11-09        kinaba: 		BigInt z;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 		mixin SimpleToString;
8de5b49cdf 2010-11-09        kinaba: 	}
8de5b49cdf 2010-11-09        kinaba: 	assert_eq( (new Temp(1,"foo",BigInt(42))).toString(), "Temp(1,foo,42)" );
8de5b49cdf 2010-11-09        kinaba: }
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /// Everything is in
8de5b49cdf 2010-11-09        kinaba: 
8de5b49cdf 2010-11-09        kinaba: /*mixin*/
8de5b49cdf 2010-11-09        kinaba: template SimpleClass()
8de5b49cdf 2010-11-09        kinaba: {
8de5b49cdf 2010-11-09        kinaba: 	mixin SimpleConstructor;
8de5b49cdf 2010-11-09        kinaba: 	mixin SimpleCompare;
8de5b49cdf 2010-11-09        kinaba: 	mixin SimpleToString;
8de5b49cdf 2010-11-09        kinaba: }