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/*
* Copyright (C) 2009-2013 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.sun.tools.javac.code.TypeTags;
import com.sun.tools.javac.main.JavaCompiler;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCLiteral;
/**
* Container for static utility methods relevant to lombok's operation on javac.
*/
public class Javac {
private Javac() {
//prevent instantiation
}
/** Matches any of the 8 primitive names, such as {@code boolean}. */
private static final Pattern PRIMITIVE_TYPE_NAME_PATTERN = Pattern.compile(
"^(boolean|byte|short|int|long|float|double|char)$");
private static final Pattern VERSION_PARSER = Pattern.compile("^(\\d{1,6})\\.(\\d{1,6}).*$");
/**
* Returns the version of this java compiler, i.e. the JDK that it shipped in. For example, for javac v1.7, this returns {@code 7}.
*/
public static int getJavaCompilerVersion() {
Matcher m = VERSION_PARSER.matcher(JavaCompiler.version());
if (m.matches()) {
int major = Integer.parseInt(m.group(1));
int minor = Integer.parseInt(m.group(2));
if (major == 1) return minor;
}
return 6;
}
/**
* Checks if the given expression (that really ought to refer to a type expression) represents a primitive type.
*/
public static boolean isPrimitive(JCExpression ref) {
String typeName = ref.toString();
return PRIMITIVE_TYPE_NAME_PATTERN.matcher(typeName).matches();
}
/**
* Turns an expression into a guessed intended literal. Only works for literals, as you can imagine.
*
* Will for example turn a TrueLiteral into 'Boolean.valueOf(true)'.
*/
public static Object calculateGuess(JCExpression expr) {
if (expr instanceof JCLiteral) {
JCLiteral lit = (JCLiteral)expr;
if (lit.getKind() == com.sun.source.tree.Tree.Kind.BOOLEAN_LITERAL) {
return ((Number)lit.value).intValue() == 0 ? false : true;
}
return lit.value;
} else if (expr instanceof JCIdent || expr instanceof JCFieldAccess) {
String x = expr.toString();
if (x.endsWith(".class")) x = x.substring(0, x.length() - 6);
else {
int idx = x.lastIndexOf('.');
if (idx > -1) x = x.substring(idx + 1);
}
return x;
} else return null;
}
public static final int CTC_BOOLEAN = getCtcInt(TypeTags.class, "BOOLEAN");
public static final int CTC_INT = getCtcInt(TypeTags.class, "INT");
public static final int CTC_DOUBLE = getCtcInt(TypeTags.class, "DOUBLE");
public static final int CTC_FLOAT = getCtcInt(TypeTags.class, "FLOAT");
public static final int CTC_SHORT = getCtcInt(TypeTags.class, "SHORT");
public static final int CTC_BYTE = getCtcInt(TypeTags.class, "BYTE");
public static final int CTC_LONG = getCtcInt(TypeTags.class, "LONG");
public static final int CTC_CHAR = getCtcInt(TypeTags.class, "CHAR");
public static final int CTC_VOID = getCtcInt(TypeTags.class, "VOID");
public static final int CTC_NONE = getCtcInt(TypeTags.class, "NONE");
public static final int CTC_NOT_EQUAL = getCtcInt(JCTree.class, "NE");
public static final int CTC_NOT = getCtcInt(JCTree.class, "NOT");
public static final int CTC_BITXOR = getCtcInt(JCTree.class, "BITXOR");
public static final int CTC_UNSIGNED_SHIFT_RIGHT = getCtcInt(JCTree.class, "USR");
public static final int CTC_MUL = getCtcInt(JCTree.class, "MUL");
public static final int CTC_PLUS = getCtcInt(JCTree.class, "PLUS");
public static final int CTC_BOT = getCtcInt(TypeTags.class, "BOT");
public static final int CTC_EQUAL = getCtcInt(JCTree.class, "EQ");
/**
* Retrieves a compile time constant of type int from the specified class location.
*
* Solves the problem of compile time constant inlining, resulting in lombok having the wrong value
* (javac compiler changes private api constants from time to time)
*
* @param ctcLocation location of the compile time constant
* @param identifier the name of the field of the compile time constant.
*/
public static int getCtcInt(Class<?> ctcLocation, String identifier) {
try {
return (Integer)ctcLocation.getField(identifier).get(null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
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