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/*******************************************************************************
* Copyright (c) 2009, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Mike Kucera (IBM) - Initial API and implementation
* Richard Eames
*******************************************************************************/
package org.eclipse.cdt.internal.core.parser.scanner;
import org.eclipse.cdt.core.parser.IToken;
/**
* Utility class that provides some simple operations for string literals.
*/
@SuppressWarnings("nls")
public enum StringType {
// Listed in order of "wideness"
NARROW("", IToken.tSTRING),
WIDE("L", IToken.tLSTRING),
UTF16("u", IToken.tUTF16STRING),
UTF32("U", IToken.tUTF32STRING);
private char[] prefix;
private int tokenVal;
private StringType(String prefix, int tokenVal) {
this.prefix = prefix.toCharArray();
this.tokenVal = tokenVal;
}
public char[] getPrefix() {
return prefix;
}
public int getTokenValue() {
return tokenVal;
}
/**
* Returns the StringType value that represents the 'wider' of the two given StringTypes.
* @throws NullPointerException if an argument is null
*/
public static StringType max(StringType st1, StringType st2) {
return values()[Math.max(st1.ordinal(), st2.ordinal())];
}
/**
* Returns the StringType value for the given string literal type.
*
* @see IToken#tSTRING
* @see IToken#tLSTRING
* @see IToken#tUTF16STRING
* @see IToken#tUTF32STRING
*
* @throws IllegalArgumentException if the tokenVal does not represent a string literal
*/
public static StringType fromToken(int tokenVal) {
switch (tokenVal) {
case IToken.tSTRING: return NARROW;
case IToken.tLSTRING: return WIDE;
case IToken.tUTF16STRING: return UTF16;
case IToken.tUTF32STRING: return UTF32;
default:
throw new IllegalArgumentException(tokenVal + " is not a string token");
}
}
/**
* Returns the StringType for a given string literal token, including a user-defined string literal
* @see StringType#fromToken(int)
* @since 5.10
*/
public static StringType fromToken(IToken token) {
switch (token.getType()) {
case IToken.tSTRING: return NARROW;
case IToken.tLSTRING: return WIDE;
case IToken.tUTF16STRING: return UTF16;
case IToken.tUTF32STRING: return UTF32;
case IToken.tUSER_DEFINED_STRING_LITERAL: {
char[] image = token.getCharImage();
switch (image[0]) {
case 'R':
case '"': return NARROW;
case 'L': return WIDE;
case 'u':
if (image.length > 3 && image[1] == '8') {
return NARROW;
}
return UTF16;
case 'U': return UTF32;
}
}
//$FALL-THROUGH$
default:
throw new IllegalArgumentException(token.getType() + " is not a string token");
}
}
}
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