ExprEvalTest.java

package org.activityinfo.model.expr;

import org.activityinfo.model.expr.eval.EmptyEvalContext;
import org.activityinfo.model.expr.functions.Casting;
import org.activityinfo.model.type.FieldValue;
import org.junit.Test;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.number.IsCloseTo.closeTo;
import static org.junit.Assert.assertThat;

public class ExprEvalTest {


    @Test
    public void evaluateExpr() {
        evaluate("1", 1);
        evaluate("1+1", 2);
        evaluate("(5+5)/2", 5);
    }

    @Test
    public void evaluateBooleanExpr() {
        evaluate("true", true);
        evaluate("false", false);
        evaluate("true&&true", true);
        evaluate("true&&false", false);
        evaluate("true||false", true);
        evaluate("false||false", false);
        evaluate("false||false||true", true);
        evaluate("(false||true)&&true", true);
        evaluate("true==true", true);
        evaluate("true==false", false);
        evaluate("true!=false", true);
        evaluate("false!=false", false);
        evaluate("true!=true", false);
        evaluate("!true", false);
        evaluate("!false", true);
    }

    private void evaluate(String exprString, double expectedValue) {
        ExprLexer lexer = new ExprLexer(exprString);
        ExprParser parser = new ExprParser(lexer);
        ExprNode expr = parser.parse();
        FieldValue value = expr.evaluate(EmptyEvalContext.INSTANCE);
        assertThat(exprString, Casting.toQuantity(value).getValue(), closeTo(expectedValue,0));
    }

    private void evaluate(String exprString, boolean expectedValue) {
        ExprLexer lexer = new ExprLexer(exprString);
        ExprParser parser = new ExprParser(lexer);
        ExprNode expr = parser.parse();
        FieldValue result = expr.evaluate(EmptyEvalContext.INSTANCE);
        assertThat(exprString, Casting.toBoolean(result), equalTo(expectedValue));
    }

}