/*

 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.

 * Copyright (C) 2011, 2013-2021 The JavaParser Team.

 *

 * This file is part of JavaParser.

 *

 * JavaParser can be used either under the terms of

 * a) 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.

 * b) the terms of the Apache License

 *

 * You should have received a copy of both licenses in LICENCE.LGPL and

 * LICENCE.APACHE. Please refer to those files for details.

 *

 * JavaParser 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.

 */

package com.github.javaparser.ast.expr;

import com.github.javaparser.TokenRange;

import com.github.javaparser.ast.AllFieldsConstructor;

import com.github.javaparser.ast.Generated;

import com.github.javaparser.ast.Node;

import com.github.javaparser.ast.visitor.CloneVisitor;

import com.github.javaparser.ast.visitor.GenericVisitor;

import com.github.javaparser.ast.visitor.VoidVisitor;

import com.github.javaparser.metamodel.CharLiteralExprMetaModel;

import com.github.javaparser.metamodel.JavaParserMetaModel;

import com.github.javaparser.utils.StringEscapeUtils;

import com.github.javaparser.utils.Utils;

import java.util.Optional;

import java.util.function.Consumer;

/**

 * A literal character.

 * <br>{@code 'a'}

 * <br>{@code '\t'}

 * <br>{@code 'Ω'}

 * <br>{@code '\177'}

 * <br>{@code '💩'}

 *

 * @author Julio Vilmar Gesser

 */

public class CharLiteralExpr extends LiteralStringValueExpr {

    public CharLiteralExpr() {

        this(null, "?");

    }

    @AllFieldsConstructor

    public CharLiteralExpr(String value) {

        this(null, value);

    }

    /**

     * Constructs a CharLiteralExpr with given escaped character.

     *

     * @param value a char

     */

    public CharLiteralExpr(char value) {

        this(null, StringEscapeUtils.escapeJava(String.valueOf(value)));

    }

    /**

     * This constructor is used by the parser and is considered private.

     */

    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")

    public CharLiteralExpr(TokenRange tokenRange, String value) {

        super(tokenRange, value);

        customInitialization();

    }

    /**

     * Utility method that creates a new StringLiteralExpr. Escapes EOL characters.

     */

    public static CharLiteralExpr escape(String string) {

        return new CharLiteralExpr(Utils.escapeEndOfLines(string));

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")

    public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) {

        return v.visit(this, arg);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")

    public <A> void accept(final VoidVisitor<A> v, final A arg) {

        v.visit(this, arg);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator")

    public boolean remove(Node node) {

        if (node == null)

            return false;

        return super.remove(node);

    }

    /**

     * @return the unescaped value character of this literal

     */

    public char asChar() {

        return StringEscapeUtils.unescapeJava(value).charAt(0);

    }

    /**

     * Sets the given char as the literal value

     *

     * @param value a char

     * @return this expression

     */

    public CharLiteralExpr setChar(char value) {

        this.value = String.valueOf(value);

        return this;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.CloneGenerator")

    public CharLiteralExpr clone() {

        return (CharLiteralExpr) accept(new CloneVisitor(), null);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")

    public CharLiteralExprMetaModel getMetaModel() {

        return JavaParserMetaModel.charLiteralExprMetaModel;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")

    public boolean replace(Node node, Node replacementNode) {

        if (node == null)

            return false;

        return super.replace(node, replacementNode);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public boolean isCharLiteralExpr() {

        return true;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public CharLiteralExpr asCharLiteralExpr() {

        return this;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public void ifCharLiteralExpr(Consumer<CharLiteralExpr> action) {

        action.accept(this);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public Optional<CharLiteralExpr> toCharLiteralExpr() {

        return Optional.of(this);

    }

}