org.sonar.java.model.LiteralUtils Maven / Gradle / Ivy
/*
* SonarQube Java
* Copyright (C) 2012 SonarSource
* [email protected]
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
*/
package org.sonar.java.model;
import org.apache.commons.lang.StringUtils;
import org.sonar.plugins.java.api.tree.ExpressionTree;
import org.sonar.plugins.java.api.tree.LiteralTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.Tree.Kind;
import org.sonar.plugins.java.api.tree.UnaryExpressionTree;
import javax.annotation.CheckForNull;
import javax.annotation.Nullable;
public class LiteralUtils {
private LiteralUtils() {
// This class only contains static methods
}
@CheckForNull
public static Integer intLiteralValue(ExpressionTree expression) {
if (expression.is(Tree.Kind.INT_LITERAL)) {
return intLiteralValue((LiteralTree) expression);
}
if (expression.is(Tree.Kind.UNARY_MINUS, Tree.Kind.UNARY_PLUS)) {
UnaryExpressionTree unaryExp = (UnaryExpressionTree) expression;
Integer subExpressionIntValue = intLiteralValue(unaryExp.expression());
return expression.is(Tree.Kind.UNARY_MINUS) ? minus(subExpressionIntValue) : subExpressionIntValue;
}
return null;
}
@CheckForNull
private static Integer intLiteralValue(LiteralTree literal) {
String literalValue = literal.value().replaceAll("_", "");
if (literalValue.startsWith("0x") || literalValue.startsWith("0b")) {
return null;
}
return Integer.valueOf(literalValue);
}
@CheckForNull
public static Long longLiteralValue(ExpressionTree tree) {
ExpressionTree expression = tree;
int sign = tree.is(Kind.UNARY_MINUS) ? -1 : 1;
if (tree.is(Kind.UNARY_MINUS, Kind.UNARY_PLUS)) {
expression = ((UnaryExpressionTree) tree).expression();
}
if (expression.is(Kind.INT_LITERAL, Kind.LONG_LITERAL)) {
String value = LiteralUtils.trimLongSuffix(((LiteralTree) expression).value());
if (value != null) {
// long as hexadecimal can be written using underscore to separate groups
value = value.replaceAll("\\_", "");
try {
return sign * Long.decode(value);
} catch (NumberFormatException e) {
// Long.decode() may fail in case of very large long number written in hexadecimal. In such situation, we ignore the number.
// Note that Long.MAX_VALUE = "0x7FFF_FFFF_FFFF_FFFFL", but it is possible to write larger numbers in hexadecimal
// to be used as mask in bitwise operation. For instance:
// 0x8000_0000_0000_0000L (MAX_VALUE + 1),
// 0xFFFF_FFFF_FFFF_FFFFL (only ones),
// 0xFFFF_FFFF_FFFF_FFFEL (only ones except least significant bit), ...
}
}
}
return null;
}
@CheckForNull
private static Integer minus(@Nullable Integer nullableInteger) {
return nullableInteger == null ? null : -nullableInteger;
}
public static String trimQuotes(String value) {
return value.substring(1, value.length() - 1);
}
@CheckForNull
public static String trimLongSuffix(String longString) {
if (StringUtils.isBlank(longString)) {
return longString;
}
int lastCharPosition = longString.length() - 1;
char lastChar = longString.charAt(lastCharPosition);
String value = longString;
if (lastChar == 'L' || lastChar == 'l') {
value = longString.substring(0, lastCharPosition);
}
return value;
}
}