org.eolang.opeo.ast.VariableAssignment Maven / Gradle / Ivy

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016-2023 Objectionary.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.eolang.opeo.ast;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.eolang.jeo.representation.xmir.XmlNode;
import org.eolang.opeo.compilation.Parser;
import org.xembly.Directive;
import org.xembly.Directives;

/**
 * Variable assignment.
 * {@code
 *          x = 2;
 * }
 * @since 0.2
 */
@ToString
@EqualsAndHashCode
public final class VariableAssignment implements AstNode {

    /**
     * Left variable.
     */
    private final LocalVariable left;

    /**
     * Right expression.
     */
    private final AstNode right;

    /**
     * Constructor.
     * @param root Xmir representation of a variable assignment.
     * @param parser Parser that will be used to parse the child nodes of the variable assignment.
     */
    public VariableAssignment(final XmlNode root, final Parser parser) {
        this(root.children().collect(Collectors.toList()), parser);
    }

    /**
     * Constructor.
     * @param children Child nodes that represent the variable and the expression.
     * @param parser Parser that will be used to parse the child nodes of the variable assignment.
     */
    public VariableAssignment(final List children, final Parser parser) {
        this((LocalVariable) parser.parse(children.get(0)), parser.parse(children.get(1)));
    }

    /**
     * Constructor.
     * @param left Left variable.
     * @param right Right expression.
     */
    public VariableAssignment(final LocalVariable left, final AstNode right) {
        this.left = left;
        this.right = right;
    }

    @Override
    public Iterable toXmir() {
        return new Directives().add("o")
            .attr("base", ".write-local-var")
            .append(this.left.toXmir())
            .append(this.right.toXmir())
            .up();
    }

    @Override
    public List opcodes() {
        final List res = new ArrayList<>(3);
        res.addAll(this.right.opcodes());
        res.add(this.left.store());
        return res;
    }
}