cc.redberry.core.parser.ParseManager Maven / Gradle / Ivy

Go to download
/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2015:
 *   Stanislav Poslavsky   
 *   Bolotin Dmitriy       
 *
 * This file is part of Redberry.
 *
 * Redberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Redberry 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Redberry. If not, see .
 */
package cc.redberry.core.parser;

import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.transformations.Transformation;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 * @since 1.0
 */
public final class ParseManager {

    /**
     * Default AST transformers to be applied before {@link cc.redberry.core.parser.ParseToken#toTensor()} conversion.
     */
    public List defaultParserPreprocessors = new ArrayList<>();

    /**
     * Default transformations to be applied after {@link cc.redberry.core.parser.ParseToken#toTensor()} conversion.
     */
    public List defaultTensorPreprocessors = new ArrayList<>();

    private final Parser parser;

    /**
     * @param parser parser
     */
    public ParseManager(Parser parser) {
        this.parser = parser;
    }

    /**
     * @param expression          string expression
     * @param tensorPreprocessors transformation
     * @param nodesPreprocessors  AST transformers
     * @return tensor
     */
    public Tensor parse(String expression, Transformation[] tensorPreprocessors, ParseTokenTransformer[] nodesPreprocessors) {
        ParseToken node = parser.parse(expression);
        for (ParseTokenTransformer tr : nodesPreprocessors)
            node = tr.transform(node);
        Tensor t = node.toTensor();
        for (Transformation tr : tensorPreprocessors)
            if (tr != t)
                t = tr.transform(t);
        return t;
    }


    /**
     * @param expression          string expression
     * @param tensorPreprocessors transformation
     * @param nodesPreprocessors  AST transformers
     * @return tensor
     */
    public Tensor parse(String expression, List tensorPreprocessors, List nodesPreprocessors) {
        ParseToken node = parser.parse(expression);
        for (ParseTokenTransformer tr : nodesPreprocessors)
            node = tr.transform(node);
        Tensor t = node.toTensor();
        for (Transformation tr : tensorPreprocessors)
            if (tr != t)
                t = tr.transform(t);
        return t;
    }

    /**
     * @param expression         string expression
     * @param nodesPreprocessors AST transformers
     * @return tensor
     */
    public Tensor parse(String expression, ParseTokenTransformer... nodesPreprocessors) {
        return parse(expression, new Transformation[0], nodesPreprocessors);
    }

    /**
     * @param expression string expression
     * @return tensor
     */
    public Tensor parse(String expression) {
        return parse(expression, defaultTensorPreprocessors, defaultParserPreprocessors);
    }

    public Parser getParser() {
        return parser;
    }

    /**
     * Clears all defaults
     */
    public void reset() {
        defaultParserPreprocessors.clear();
        defaultTensorPreprocessors.clear();
    }
}