/*
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.template.soy.basicfunctions;
import static com.google.template.soy.javasrc.restricted.SoyJavaSrcFunctionUtils.toNumberJavaExpr;
import static com.google.template.soy.shared.restricted.SoyJavaRuntimeFunctionUtils.toSoyData;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.template.soy.data.SoyData;
import com.google.template.soy.data.restricted.IntegerData;
import com.google.template.soy.data.restricted.NumberData;
import com.google.template.soy.exprtree.Operator;
import com.google.template.soy.javasrc.restricted.JavaCodeUtils;
import com.google.template.soy.javasrc.restricted.JavaExpr;
import com.google.template.soy.javasrc.restricted.SoyJavaSrcFunction;
import com.google.template.soy.jssrc.restricted.JsExpr;
import com.google.template.soy.jssrc.restricted.SoyJsCodeUtils;
import com.google.template.soy.jssrc.restricted.SoyJsSrcFunction;
import com.google.template.soy.shared.restricted.SoyPureFunction;
import com.google.template.soy.tofu.restricted.SoyAbstractTofuFunction;
import java.util.List;
import java.util.Set;
/**
* Soy function that rounds a number to a specified number of digits before or after the decimal
* point.
*
* @author Kai Huang
*/
@Singleton
@SoyPureFunction
class RoundFunction extends SoyAbstractTofuFunction
implements SoyJsSrcFunction, SoyJavaSrcFunction {
@Inject
RoundFunction() {}
@Override public String getName() {
return "round";
}
@Override public Set<Integer> getValidArgsSizes() {
return ImmutableSet.of(1, 2);
}
@Override public SoyData compute(List<SoyData> args) {
SoyData value = args.get(0);
int numDigitsAfterPt = (args.size() == 2) ? args.get(1).integerValue() : 0 /* default */;
if (numDigitsAfterPt == 0) {
if (value instanceof IntegerData) {
return toSoyData(value.integerValue());
} else {
return toSoyData((int) Math.round(value.numberValue()));
}
} else if (numDigitsAfterPt > 0) {
double valueDouble = value.numberValue();
double shift = Math.pow(10, numDigitsAfterPt);
return toSoyData(Math.round(valueDouble * shift) / shift);
} else {
double valueDouble = value.numberValue();
double shift = Math.pow(10, -numDigitsAfterPt);
return toSoyData((int) (Math.round(valueDouble / shift) * shift));
}
}
@Override public JsExpr computeForJsSrc(List<JsExpr> args) {
JsExpr value = args.get(0);
JsExpr numDigitsAfterPt = (args.size() == 2) ? args.get(1) : null;
int numDigitsAfterPtAsInt = 0;
if (numDigitsAfterPt != null) {
try {
numDigitsAfterPtAsInt = Integer.parseInt(numDigitsAfterPt.getText());
} catch (NumberFormatException nfe) {
numDigitsAfterPtAsInt = Integer.MIN_VALUE; // indicates it's not a simple integer literal
}
}
if (numDigitsAfterPtAsInt == 0) {
// Case 1: round() has only one argument or the second argument is 0.
return new JsExpr("Math.round(" + value.getText() + ")", Integer.MAX_VALUE);
} else if ((numDigitsAfterPtAsInt >= 0 && numDigitsAfterPtAsInt <= 12) ||
numDigitsAfterPtAsInt == Integer.MIN_VALUE) {
String shiftExprText;
if (numDigitsAfterPtAsInt >= 0 && numDigitsAfterPtAsInt <= 12) {
shiftExprText = "1" + "000000000000".substring(0, numDigitsAfterPtAsInt);
} else {
shiftExprText = "Math.pow(10, " + numDigitsAfterPt.getText() + ")";
}
JsExpr shift = new JsExpr(shiftExprText, Integer.MAX_VALUE);
JsExpr valueTimesShift = SoyJsCodeUtils.genJsExprUsingSoySyntax(
Operator.TIMES, Lists.newArrayList(value, shift));
return new JsExpr(
"Math.round(" + valueTimesShift.getText() + ") / " + shift.getText(),
Operator.DIVIDE_BY.getPrecedence());
} else if (numDigitsAfterPtAsInt < 0 && numDigitsAfterPtAsInt >= -12) {
String shiftExprText = "1" + "000000000000".substring(0, -numDigitsAfterPtAsInt);
JsExpr shift = new JsExpr(shiftExprText, Integer.MAX_VALUE);
JsExpr valueDivideByShift = SoyJsCodeUtils.genJsExprUsingSoySyntax(
Operator.DIVIDE_BY, Lists.newArrayList(value, shift));
return new JsExpr(
"Math.round(" + valueDivideByShift.getText() + ") * " + shift.getText(),
Operator.TIMES.getPrecedence());
} else {
throw new IllegalArgumentException(
"Second argument to round() function is " + numDigitsAfterPtAsInt +
", which is too large in magnitude.");
}
}
@Override public JavaExpr computeForJavaSrc(List<JavaExpr> args) {
JavaExpr value = args.get(0);
JavaExpr numDigitsAfterPt = (args.size() == 2) ? args.get(1) : null;
String numDigitsAfterPtExprText =
(numDigitsAfterPt != null) ?
JavaCodeUtils.genMaybeCast(numDigitsAfterPt, IntegerData.class) : "null";
return toNumberJavaExpr(JavaCodeUtils.genFunctionCall(
JavaCodeUtils.UTILS_LIB + ".$$round",
JavaCodeUtils.genMaybeCast(value, NumberData.class),
numDigitsAfterPtExprText));
}
}