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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 Chapter14FloatTest {
@Test public void testSubZeroFloat() {
var stop = new Parser("flt x = arg; return 0-x;").parse().iterate();
// Compare strings so +0.0 and -0.0 remain distinct.
assertEquals("0.0", Evaluator.evaluate(stop,0).toString());
assertEquals("-1.0", Evaluator.evaluate(stop,1).toString());
}
@Test public void testDeadNumericReturns() {
for( String[] test : new String[][] {
{"if(1) return 7; else return 2.5;", "7"},
{"if(0) return 7; else return 2.5;", "2.5"},
{"return 7; return 2.5;", "7"},
{"return 2.5; return 7;", "2.5"}
} ) {
String src = test[0];
var stop = new Parser(src).parse().iterate();
assertEquals(src,test[1],com.seaofnodes.simple.evaluator.Evaluator.evaluate(stop,0).toString());
}
}
@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 testFloat() {
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 testSquareRoot() {
Parser parser = new Parser(
"""
flt guess = arg;
while( 1 ) {
flt next = (arg/guess + guess)/2;
if( next == guess ) break;
guess = next;
}
return guess;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return Phi(Loop,(flt)arg,(((ToFloat/Phi_guess)+Phi_guess)/2.0));", stop.toString());
assertEquals(3.0, Evaluator.evaluate(stop, 9));
assertEquals(1.414213562373095, Evaluator.evaluate(stop, 2));
}
@Test
public void testFPOps() {
Parser parser = new Parser(
"""
flt x = arg;
return x+1==x;
""");
StopNode stop = parser.parse().iterate();
assertEquals("return ((flt)arg==(ToFloat+1.0));", stop.toString());
assertEquals(0L, Evaluator.evaluate(stop, 1));
}
}
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