001    /*
002     * Copyright 2010-2015 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.resolve.constants;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
021    import org.jetbrains.kotlin.descriptors.annotations.AnnotationArgumentVisitor;
022    import org.jetbrains.kotlin.types.JetType;
023    
024    public class CharValue extends IntegerValueConstant<Character> {
025    
026        public CharValue(char value, boolean canBeUsedInAnnotations, boolean pure, boolean usesVariableAsConstant) {
027            super(value, canBeUsedInAnnotations, pure, usesVariableAsConstant);
028        }
029    
030        @NotNull
031        @Override
032        public JetType getType(@NotNull KotlinBuiltIns kotlinBuiltIns) {
033            return kotlinBuiltIns.getCharType();
034        }
035    
036        @Override
037        public <R, D> R accept(AnnotationArgumentVisitor<R, D> visitor, D data) {
038            return visitor.visitCharValue(this, data);
039        }
040    
041        @Override
042        public String toString() {
043            return String.format("\\u%04X ('%s')", (int) value, getPrintablePart(value));
044        }
045    
046        private static String getPrintablePart(char c) {
047            switch (c) {
048                case '\b':
049                    return "\\b";
050                case '\t':
051                    return "\\t";
052                case '\n':
053                    return "\\n";
054                case '\f':
055                    return "\\f";
056                case '\r':
057                    return "\\r";
058                default:
059                    return isPrintableUnicode(c) ? Character.toString(c) : "?";
060            }
061        }
062    
063        private static boolean isPrintableUnicode(char c) {
064            int t = Character.getType(c);
065            return t != Character.UNASSIGNED && t != Character.LINE_SEPARATOR && t != Character.PARAGRAPH_SEPARATOR &&
066                   t != Character.CONTROL && t != Character.FORMAT && t != Character.PRIVATE_USE && t != Character.SURROGATE;
067        }
068    }