// Burak's test suite for regular pattern matching
//import java.lang.System; // to avoid name clash with .NET's library
object Test {
def main(args: Array[String]): Unit = {
Console.println("pretest");
val L = List(1,2,3);
scala.testing.UnitTest.assertEquals( L, L match { case List(xs@_*) => xs; } ) ;
testWR.main( args );
testWS.main( args );
testWT.main( args );
testWV.main( args );
//testWW.main( args );
testBK.main( args );
testBL.main( args );
testBM.main( args );
testBN.main( args );
testBO.main( args );
testMZ.main;
//testNN.main;
//testBugSequenceApply.main;
}
}
// contains 17 visitors plus X
// analyzer related (no execution)
object bug179 {
case class One();
object Foo {
def test(xs: List[Any]) = xs match {
case List(((((One(), One())*) | (One(), One())), One())) =>
Console.println("case")
case _ =>
Console.println("default");
}
}
}
// testW? are for recognition only ( no variables )
// testB? are for variables binding
object values { // test values reused in nearly all test cases
val s0:List[Char] = Nil ;
val s1:List[Char] = 'a'::'b'::'c'::Nil ;
val s2:List[Char] = 'a'::'b'::'c'::s1 ;
val s3:List[Char] = 'a'::'a'::'a'::Nil ;
val s4:List[Char] = 'b'::'c'::Nil ;
val s5:List[Char] = 'b'::Nil ;
val s6:List[Char] = 'b'::'a'::'a'::'a'::Nil ;
val s7:List[Int] = 1::2::7::Nil ;
val s8:List[Int] = 1::0::1::0::Nil;
val s9:List[Int] = Nil ;
val s10:List[Char] = '7'::'0'::'1'::'.'::'2'::'4'::Nil ;
}
// matching without binding
// 2do case [ 'a'; x; y ] => 100
// case [ z @ ('a'; x; y) ] => 100
// 2do case [ 'a'*; x @ ( _;('a'; 'b')* ); y @ 'b'* ] => 100
// case _ => 321 // 20022 // this never happens
object testBK {
import values._ ;
import scala.testing.UnitTest._ ;
def doit1(e: List[Char]):Int = e match {
case List( 'a'*, x @ ( 'a',('a', 'b')* ), y @ ('b'*) ) => { 100 }
case List( _ * ) => 321
};
def test1:Unit = {
Console.println("testBK");
//test[List[Char],Int]( doit1, s0, 321);
assertEquals( doit1( s0 ), 321);
assertEquals( doit1( s1 ),321);
assertEquals( doit1( s2 ),321);
assertEquals( doit1( s3 ),100);
assertEquals( doit1( s4 ),321);
assertEquals( doit1( s5 ),321);
assertEquals( doit1( s6 ),321)
};
def main( args:Array[ String ] ) = {
test1;
}
}
// tests with binding
object testBL {
import scala.testing.UnitTest._ ;
def preTest(a:String,b:String):boolean = (a==b);
def doit( x:List[String] ):String = x match {
case List( z @ "John" ) => z
}
// BEWARE: main type should be specified...
// often, last thing is not () then you have a problem
def main(args:Array[String]):Unit = {
val a = "John";
val b = "John";
assertEquals( a == b, true );
assertEquals( doit( List( b ) ), "John" )
}
}
object testBM {
import scala.testing.UnitTest._ ;
import values._ ;
def doit1(e: List[Char]):List[Char] = e match {
case List( 'a'*, x @ ( 'a',('a', 'b')* ), y @ ('b'*) )
=> { x.toList }
case List( 'a'*, x @ (('a', 'b')*) , y @ (('a','b','c') *) )
=> { y.toList }
case List( _ * )
=> Nil
};
def test1:Unit = {
Console.println("testBM");
assertEquals( doit1( s0 ), Nil);
assertEquals( doit1( s1 ), s1);
assertEquals( doit1( s2 ), s2);
assertEquals( doit1( s3 ), List('a'));
assertEquals( doit1( s4 ), Nil);
assertEquals( doit1( s5 ), Nil);
assertEquals( doit1( s6 ), Nil);
val t7:List[Char] = 'a'::'a'::'a'::'b'::'b'::'b'::Nil;
//val t7ex:List[Char] = 'a'::'a'::'b'::Nil; // with longest match policy
assertEquals( doit1( t7 ), List('a') );
};
def main( args:Array[ String ] ) = {
test1;
}
}
object testBN {
import scala.testing.UnitTest._ ;
import values._ ;
class testClass;
case class testA( arg:List[Char] ) extends testClass;
def doit1(e: testClass):List[Char] = e match {
case testA(List( 'a', x, y )) => x::y::Nil
case _ => Nil
};
def test1:Unit = {
Console.print("BN preTest: ");
Console.println( Nil == Nil );
Console.println("testBN");
assertEquals
( doit1( testA(s0)), Nil);
assertEquals
( doit1( testA(s1)), 'b'::'c'::Nil);
assertEquals
( doit1( testA(s2)), Nil);
assertEquals
( doit1( testA(s3)), 'a'::'a'::Nil);
assertEquals
( doit1( testA(s4)), Nil);
assertEquals
( doit1( testA(s5)), Nil);
assertEquals
( doit1( testA(s6)), Nil);
};
def main( args:Array[String] ) = {
test1
}
}
object testBO {
// example suggested by Matthias
import scala.testing.UnitTest._ ;
case class Person( firstname:String, lastname:String );
def onlyJohn( db:List[ Person ] ):List[ String ] = {
db match {
case List( Person( "John", lastname ) )
=> lastname::Nil
case _
=> Nil
}
}
/** first longest match policy -> the star is greedy/hungry/...
*/
def searchFirstJohn( db:List[ Person ] ):String = {
db match {
case List( _ *, Person( "John", lastname ), _ * )
=> lastname
case _
=> "<not found>"
}
}
/** first longest match policy -> star is a greedy/hungry
*/
def searchJohns( db:List[Person]):List[String] = {
db match {
case List( _ *, Person( "John", lastname ), rest@(_ *) )
=> { //Console.print("before is : "+before );
lastname::searchJohns( rest.toList )
}
case _
=> Nil
}
}
def main( args:Array[String] ) = {
val p1 = Person("Albert", "Camus");
val p2 = Person("Henry", "Miller");
val p3 = Person("John", "Le Carre");
val p4 = Person("Herbert", "Franke");
val p5 = Person("John", "Smith");
val p6 = Person("William", "Gibson");
val db:List[Person] = p1::p2::p3::p4::p5::p6::Nil;
val db2:List[Person] = p3::Nil;
Console.println("testBO");
assertEquals
( onlyJohn( db ), Nil );
assertEquals
( onlyJohn( db2 ), "Le Carre"::Nil );
assertEquals
( searchFirstJohn( db ), "Le Carre" );
assertEquals
( searchFirstJohn( db2 ), "Le Carre" );
assertEquals
( searchJohns( db ), "Le Carre"::"Smith"::Nil );
assertEquals
( searchJohns( db2 ), "Le Carre"::Nil );
}
}
object testWR {
import values._ ;
import scala.testing.UnitTest._ ;
def doit1(e: List[Char]):Int = e match {
case List( 'a', 'b', 'c' ) => 100
case _ => 321
};
def test1:Unit = {
Console.println("testWR_1");
assertEquals( doit1( s0 ),321);
assertEquals( doit1( s1 ),100);
assertEquals( doit1( s2 ),321);
assertEquals( doit1( s3 ),321);
assertEquals( doit1( s4 ),321);
assertEquals( doit1( s5 ),321);
assertEquals( doit1( s6 ),321)
};
def doit2(e: List[Char]):Int = e match {
case List( ('a', 'b','c')? ) => 1000
case _ => 321
}
def test2:Unit = {
Console.println("testWR_2");
assertEquals( doit2( s0 ),1000);
assertEquals( doit2( s1 ),1000);
assertEquals( doit2( s2 ),321);
assertEquals( doit2( s3 ),321);
assertEquals( doit2( s4 ),321);
assertEquals( doit2( s5 ),321);
assertEquals( doit2( s6 ),321);
}
def doit3(e: List[Char]):String = e match {
case List( ('a', 'a','a')? ) => "ok"
case _ => "fail"
}
def test3:Unit = {
Console.println("testWR_3");
assertEquals( doit3( s0 ), "ok");
assertEquals( doit3( s1 ),"fail");
assertEquals( doit3( s2 ), "fail");
assertEquals( doit3( s3 ),"ok");
assertEquals( doit3( s4 ),"fail");
assertEquals( doit3( s5 ),"fail");
assertEquals( doit3( s6 ),"fail");
}
def doit4(e: List[Char]):String = e match {
case List( ('a'|'b')*,('a'|'b'|'c')+ ) => "ga!!!!"
case _ => "gu"
}
def test4:Unit = {
Console.println("testWR_4");
assertEquals( doit4( s0 ), "gu");
assertEquals( doit4( s1 ), "ga!!!!");
assertEquals( doit4( s2 ), "ga!!!!");
assertEquals( doit4( s3 ), "ga!!!!");
assertEquals( doit4( s4 ), "ga!!!!");
assertEquals( doit4( s5 ), "ga!!!!");
assertEquals( doit4( s6 ), "ga!!!!");
}
def doit5(e: List[Int]):String = e match {
case List( (0|1)+ ) => "binary"
case _ => "not binary"
}
def test5:Unit = {
Console.println("testWR_5");
assertEquals( doit5( s7 ), "not binary");
assertEquals( doit5( s8 ), "binary");
assertEquals( doit5( s9 ), "not binary");
}
// { ('0'..'9')*;'.';('0'..'9');('0'..'9')* ]
def doit6(e: List[Char]):String = e match {
case List( ('0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9')*,
'.',
('0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'),
('0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9')* )
=> "decimal number"
case _ => "not decimal"
}
def test6:Unit = {
Console.println("testWR_6");
assertEquals( doit6( s3 ), "not decimal");
assertEquals( doit6( s10 ), "decimal number");
}
def test8: Unit = {
Console.println("testWR_8");
assertTrue( List('d','c') match {
case List('a'*, 'd'|'e', 'c'*) => true
case _ => false
});
}
def test7:Unit = {
Console.println("testWR_7");
assertEquals( List(1,2) match {
case List(1,(3*,2))=> true; // test normalization (pattern normalizer)
case _ => false;
}, true);
}
def main( args:Array[String] ) = {
test1;
test2;
test3;
test4;
test5;
test6;
test7;
test8;
}
}
object testWS {
import values._ ;
import scala.testing.UnitTest._ ;
/* strings:
"blabla" == [ "bla";"bla" ] == [ 'b';'l';'a';'b';'l';'a' ]
[ "blabla";'x';'y'? ] == [ ('b';'l';'a';'b';'l';'a'); 'x'; 'y'? ]
*/
/*
def isIdentifierStart(c:char) ;
case [ ... ; _isIdentifierStart_ ; ... ]
calls method is..., needs to have type (elementType)Boolean
translated to pattern
[ ... ; Apply(is..., Tree.Empty) ; ... ]
*/
/* for tree automata:
[ t0; t1; ...; tn ] with ti = labeli ( argsi )
gets translated to
[ _isTree$0_ ; _isTree$1_ ; ... ; _isTree$n_ ]
where isTree$i( t ) = t.is[ labeli ] ... (algebraic matcher)
special case: sequences
[ ...; seq ; ... ] where seq = [ ... ]
gets translated to
[ ...; _seq$0_ ; ...] with seq$0( s ) = t.is[ Sequence ] and
seq$0match( s.newIterator )
subroutines return
1) d'abord true or false,
2) later ( true|false, environment )
assume order on variables, enviroment is a tuple/sequence
*/
def doit1(e: List[Char]):Int = e match {
case List( 'a', 'b', 'c' ) => 100
case List( ('a', 'b','c')? ) => 1004
case List( ('a', 'a','a')? ) => 50
case List( ('a'|'b')*,('a'|'b') ) => 700
case _ => 321
};
def test1:Unit = {
Console.println("testWS");
assertEquals( doit1( s0 ),1004);
assertEquals( doit1( s1 ),100);
assertEquals( doit1( s2 ),321);
assertEquals( doit1( s3 ),50);
assertEquals( doit1( s4 ),321);
assertEquals( doit1( s5 ),700);
assertEquals( doit1( s6 ),700);
};
def main( args:Array[String] ) = {
test1;
}
}
object testWT {
import values._ ;
import scala.testing.UnitTest._ ;
def doit1(e: List[Char]):Int = e match {
case List( 'a', _, _ ) => 100
case List( _ * ) => 321
case _ => 20022 // this never happens
};
def test1:Unit = {
Console.println("testWT");
assertEquals( doit1( s0 ),321);
assertEquals( doit1( s1 ),100);
assertEquals( doit1( s2 ),321);
assertEquals( doit1( s3 ),100);
assertEquals( doit1( s4 ),321);
assertEquals( doit1( s5 ),321);
assertEquals( doit1( s6 ),321)
};
def main( args:Array[ String ] ) = {
test1;
}
}
object testWV {
import values._ ;
import scala.testing.UnitTest._ ;
class testClass;
case class testA( arg:List[Char] ) extends testClass;
def doit1( e: testClass ):Int = e match {
case testA( List( 'a', 'b', 'c' )) => 100
case testA( List( ('a', 'b','c')? )) => 1004
case testA( List( ('a', 'a','a')? )) => 50
case testA( List( ('a'|'b')*,('a'|'b') )) => 700
case testA( _ ) => 321
};
def test1:Unit = {
Console.println("testWV");
assertEquals( doit1( testA(s0) ),1004);
assertEquals( doit1( testA(s1) ),100);
assertEquals( doit1( testA(s2) ),321);
assertEquals( doit1( testA(s3) ),50);
assertEquals( doit1( testA(s4) ),321);
assertEquals( doit1( testA(s5) ),700);
assertEquals( doit1( testA(s6) ),700);
};
def main( args:Array[String] ) = {
test1
}
}
/*
object testWW {
import values._ ;
import scala.testing.UnitTest._ ;
class testClass;
case class testA( arg:List[Char] ) extends testClass;
def doit1(e: List[testClass]):Int = e match {
case List( testA(List()), testA( List( 'a', 'b' )) ) => 100
case _ => 321
};
def test1:Unit = {
val x1 = List( testA(s0) );
Console.println("testWW");
assertEquals( doit1( x1 ), 321 );
val x2 = List( testA(Nil), testA('a'::'b'::Nil) );
assertEquals( doit1( x2 ), 100 );
}
def main( args:Array[String] ) = {
test1;
}
}
*/
object testMZ {
import scala.testing.UnitTest.assertEquals ;
class Expr;
case class One(xs: List[Expr]) extends Expr;
case class Two() extends Expr;
def testFoo(xs: List[Expr]) = xs match { //bug#132
case List(Two()?,a,Two()?) => "a = " + a;
case List(Two()*,b,Two()*) => "b = " + b;
case List(_*) => "no match";
}
case class OneN();
def bind(xs: List[Any]):String = xs match { // bug#133b
case List(x@(OneN()*), y@(OneN())) => "case";
case _ => "default";
}
case class On();
case class Tw();
def testBar(xs: List[Any]) = xs match { // bug#180
case List(((On(), Tw())* | (On(), On())), On()) => "caseBar"
case _ => "default";
}
def mat195(x:Expr) = x match { // bug#195
case One(x@List(_*)) =>
"x = " + x;
case _ =>"default";
}
def mat196(xs: List[Any]) = xs match { // bug#196
case List(b@(()|())) =>
"case, b = " + b;
case _ =>"default";
}
def mat398(xs:List[Any]) = xs match { // bug#398
case List(1) => "one"
case x::xs => "two"
}
def mat406() = {
class Type;
case class A() extends Type;
case class B() extends Type;
case class C() extends Type;
def foo(x: Type, y: Type): String = Pair(x, y) match {
case Pair(A(), A())
| Pair(A(), B())
| Pair(B(), A())
| Pair(B(), B()) => "3"
case Pair(C(), C()) => "4"
case Pair(A(), _)
| Pair(B(), _) => "7"
case _ => "8"
}
foo(A(), C())
}
def mat441() = {
val tata = 1;
val titi = 0.8 + Math.random();
try {
tata match {
case 1 if (titi < 0.5) => "a"
case 0 | 1 => "b"
}
} catch {
case _ => "c"
}
}
/* this will crash
def matSymbolCloning = {
2 match {
case 3 | 4 =>
class Foo extends scala.xml.Atom[Int](3) {
def bar = 7;
}
null
}
}
*/
def main:Unit = {
Console.println("testMZ - bugs #132 #133b #180 #195 #196 #398 #406 #441");
assertEquals(testFoo( List(Two(),Two(),Two(),Two()) ),"b = Two");
assertEquals(testFoo( List(Two(),Two(),Two()) ),"a = Two");
assertEquals(testFoo( List(Two(),Two()) ),"a = Two");
assertEquals(testFoo( List(Two()) ),"a = Two");
assertEquals(testFoo( List() ),"no match");
assertEquals(bind( List(OneN(),OneN()) ),"case");
assertEquals(testBar( List() ),"default");
assertEquals(testBar( List(On()) ),"caseBar");
assertEquals(testBar( List(On(), On())), "default");
assertEquals(testBar( List(On(), On(), On()) ),"caseBar");
assertEquals(testBar( List(On(), On(), On(), On()) ),"default");
assertEquals(testBar( List(On(), On(), On(), On(), On()) ),"default");
assertEquals(mat195( One(List(Two(),Two())) ),"x = List(Two,Two)");
assertEquals(mat195( One(List()) ),"x = List()");
assertEquals(mat195( Two() ),"default");
assertEquals(mat196( List(1) ),"default");
assertEquals(mat196( List() ),"case, b = List()");
assertEquals(mat398( List(2) ),"two");
assertEquals(mat398( List(2) ),"two");
assertEquals(mat406(), "7");
assertEquals(mat441(), "b");
()
}
}
/*
object testNN {
import scala.testing.UnitTest._ ;
abstract class K;
case class F(x:K*) extends K;
case class G() extends K;
def mtch(k:K):boolean = k match {
case F(F(G()*),G(),F(G()*)) => true;
case _ => false;
}
def main:Unit = {
Console.println("testNN");
assertEquals(mtch( F(F(G()),G(),F(G()))), true);
assertEquals(mtch( F(F(),G(),F(G(),G(),G(),G())) ), true);
assertEquals(mtch( G() ), false);
assertEquals(mtch( F(G()) ), false);
}
}
*/
object testNO { // this does not need to be run, only compiled
trait Operator;
case class Increment() extends Operator;
case class Decrement() extends Operator;
trait Expression {
def eval = this match {
case Operation (v: Value, o: Increment) => v
case Operation (v: Value, d: Decrement) => v
}
}
case class Value() extends Expression;
case class Operation (e: Expression, o: Operator) extends Expression;
}
/** see comments in scala.tools.scalac.transformer.matching.PatternMatcher::isSeqApply 2005-02-17
*/
/*
object testBugSequenceApply {
val x = List(1,2,3);
case class ThreeBars extends Seq[Int] {
override def length = 3;
def elements = x.elements;
def apply(i:Int) = x.apply(i);
}
// this works
def main:Unit = {
Console.print("testBugSequenceApply ");
val z: Seq[Int] = new ThreeBars();
Console.print(z match {
case Seq(1,2,3) => "hello" // but ThreeBars is a case class...
});
Console.print(ThreeBars() match {
case Seq(1,2,3) => " hello" // but ThreeBars is a case class...
});
}
}
*/