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package com.seaofnodes.simple;
import com.seaofnodes.simple.evaluator.Evaluator;
import com.seaofnodes.simple.node.StopNode;
import org.junit.Ignore;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
public class Chapter16Test {
@Test
public void testRequiredReference() {
for( String fields : new String[] { "int[] x;" } ) {
String src = "struct Point { "+fields+" }; Point p = new Point; p.x=p.x+1; return p;";
try { new Parser(src).parse().iterate(); fail(fields); }
catch( Exception e ) { assertEquals("'Point' is not fully initialized, field 'x' needs to be set in a constructor",e.getMessage()); }
}
}
@Ignore
@Test
public void testJig() {
Parser parser = new Parser(
"""
return 3.14;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return 3.14;", stop.toString());
assertEquals(3.14, Evaluator.evaluate(stop, 0));
}
@Test
public void testMulti0() {
Parser parser = new Parser(
"""
int x, y;
return x+y;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return 0;", stop.toString());
assertEquals(0L, Evaluator.evaluate(stop, 0));
}
@Test
public void testMulti1() {
Parser parser = new Parser(
"""
int x=2, y=x+1;
return x+y;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return 5;", stop.toString());
assertEquals(5L, Evaluator.evaluate(stop, 0));
}
@Test
public void testConstruct0() {
Parser parser = new Parser("""
struct X { int x=3; };
X z = new X;
return z.x;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return 3;", stop.toString());
assertEquals(3L, Evaluator.evaluate(stop, 0));
}
@Test
public void testConstruct2() {
Parser parser = new Parser("""
struct X { int x=3; };
X z = new X { x = 4; };
return z.x;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return 4;", stop.toString());
assertEquals(4L, Evaluator.evaluate(stop, 0));
}
// Same as the Chapter13 test with the same name, but using the new
// constructor syntax
@Test
public void testLinkedList1() {
Parser parser = new Parser(
"""
struct LLI { LLI? next; int i; };
LLI? head = null;
while( arg ) {
head = new LLI { next=head; i=arg; };
arg = arg-1;
}
if( !head ) return 0;
LLI? next = head.next;
if( !next ) return 1;
return next.i;
""");
StopNode stop = parser.parse().iterate();
assertEquals("Stop[ return 0; return 1; return .i; ]", stop.toString());
assertEquals(0L, Evaluator.evaluate(stop, 0));
assertEquals(1L, Evaluator.evaluate(stop, 1));
assertEquals(2L, Evaluator.evaluate(stop, 3));
}
@Test
public void testLinkedList2() {
Parser parser = new Parser(
"""
struct LLI { LLI? next; int i; };
LLI? head = null;
while( arg ) {
head = new LLI {
next=head;
// Any old code in the constructor
int tmp=arg;
while( arg > 10 ) {
tmp = tmp + arg;
arg = arg - 1;
}
i=tmp;
};
arg = arg-1;
}
if( !head ) return 0;
LLI? next = head.next;
if( !next ) return 1;
return next.i;
""");
StopNode stop = parser.parse().iterate();
assertEquals("Stop[ return 0; return 1; return .i; ]", stop.toString());
assertEquals(0L, Evaluator.evaluate(stop, 0));
assertEquals(1L, Evaluator.evaluate(stop, 1));
assertEquals(2L, Evaluator.evaluate(stop, 11));
}
@Test
public void testSquare() {
Parser parser = new Parser(
"""
struct Square {
flt side = arg;
// Newtons approximation to the square root, computed in a constructor.
// The actual allocation will copy in this result as the initial
// value for 'diag'.
flt diag = arg*arg/2;
while( 1 ) {
flt next = (side/diag + diag)/2;
if( next == diag ) break;
diag = next;
}
};
return new Square;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return Square;", stop.toString());
assertEquals("Obj<Square>{side=3.0,diag=1.7320508075688772}", Evaluator.evaluate(stop, 3).toString());
assertEquals("Obj<Square>{side=4.0,diag=2.0}", Evaluator.evaluate(stop, 4).toString());
}
static final String CONSTRUCTOR_MEMORY = """
struct S { int x; int y; };
struct T { int z=arg+40; };
T t = new T;
S a = new S { x=11; y=7; };
S b = new S { x=22; y=9; };
S p=a;
if (arg) p=b;
int before=p.x;
S c = new S {
x=p.x+1;
{ int i=0; while (i<2) { p.y=p.y+1; i=i+1; } }
y=p.y;
};
p.x=33;
return before*10000+c.x*100+c.y+t.z;
""";
@Test public void testConstructorMemory() {
StopNode stop = new Parser(CONSTRUCTOR_MEMORY).parse().iterate();
assertEquals(111249L,Evaluator.evaluate(stop,0));
assertEquals(222352L,Evaluator.evaluate(stop,1));
}
}
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