GLSLCondition.java

/*
 * Copyright 2010 Jean-Paul Balabanian and Yngve Devik Hammersland
 *
 *     This file is part of glsl4idea.
 *
 *     Glsl4idea 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.
 *
 *     Glsl4idea 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 General Public License
 *     along with glsl4idea.  If not, see <http://www.gnu.org/licenses/>.
 */

package glslplugin.lang.elements.expressions;

import com.intellij.lang.ASTNode;
import glslplugin.lang.elements.GLSLElementImpl;
import glslplugin.lang.elements.GLSLTypedElement;
import glslplugin.lang.elements.declarations.GLSLDeclarator;
import glslplugin.lang.elements.declarations.GLSLVariableDeclaration;
import glslplugin.lang.elements.types.GLSLType;
import glslplugin.lang.elements.types.GLSLTypes;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class GLSLCondition extends GLSLElementImpl implements GLSLTypedElement {

    public GLSLCondition(@NotNull ASTNode astNode) {
        super(astNode);
    }

    @Nullable
    private GLSLDeclarator getDeclarator() {
        GLSLVariableDeclaration declaration = getVariableDeclaration();
        if(declaration != null) {
            GLSLDeclarator[] declarators = declaration.getDeclarators();
            if(declarators.length > 0)
                return declarators[0];
        }
        return null;
    }

    @Nullable
    public GLSLExpression getConditionExpression() {
        GLSLDeclarator declarator = getDeclarator();
        if(declarator != null)
            return declarator.getInitializerExpression();
        return findChildByClass(GLSLExpression.class);
    }

    /**
     * For and while statements can declare a single variable.
     */
    @Nullable
    private GLSLVariableDeclaration getVariableDeclaration() {
        return findChildByClass(GLSLVariableDeclaration.class);
    }

    @NotNull
    @Override
    public GLSLType getType() {
        GLSLVariableDeclaration declaration = getVariableDeclaration();
        if(declaration != null) {
            GLSLDeclarator[] declarators = declaration.getDeclarators();
            if(declarators.length == 0){
                return GLSLTypes.UNKNOWN_TYPE;
            }else{
                //There should be only one declarator, but if there is more, use the type of the last one
                return declarators[declarators.length - 1].getType();
            }
        }

        GLSLExpression conditionExpression = getConditionExpression();
        if(conditionExpression == null){
            return GLSLTypes.UNKNOWN_TYPE;
        }else{
            return conditionExpression.getType();
        }
    }
}