ru.vyarus.yaml.updater.parse.struct.model.StructTree Maven / Gradle / Ivy

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Merges current yaml config with a new version to add missed properties

There is a newer version: 1.4.4

package ru.vyarus.yaml.updater.parse.struct.model;

import ru.vyarus.yaml.updater.parse.common.TreeStringUtils;
import ru.vyarus.yaml.updater.parse.common.model.TreeRoot;

import java.util.List;

/**
 * Yaml tree build by snakeyaml-based parser.
 *
 * @author Vyacheslav Rusakov
 * @since 05.05.2021
 */
public class StructTree extends TreeRoot {

    private static final int MAX_VAL_LENGTH = 80;

    public StructTree(final List nodes, final int linesCount) {
        super(nodes, linesCount);
    }

    @Override
    public String toString() {
        // to string shows structural view to quickly identify parsing errors
        final StringBuilder out = new StringBuilder();

        if (getChildren().isEmpty()) {
            out.append("");
        } else {
            getChildren().forEach(node -> renderNode(node, out, false));
        }

        return out.toString();
    }

    @SuppressWarnings("checkstyle:MultipleStringLiterals")
    private void renderNode(final StructNode node, final StringBuilder out, final boolean noPadding) {
        if (!noPadding) {
            out.append(TreeStringUtils.whitespace(node.getPadding()));
        }
        if (node.isListItem()) {
            out.append("- ");
        }
        if (node.getKey() != null) {
            out.append(node.getKey()).append(": ");
        }
        if (node.getValue() != null) {
            // identify multiline values (and avoid visual ambiguity)
            String val = "'" + node.getValue().replace("\n", "\\n");
            if (val.length() > MAX_VAL_LENGTH) {
                val = val.substring(0, MAX_VAL_LENGTH) + "...";
            }
            // value identified with quotes to avoid ubiquity whe value looks like property
            out.append(val).append('\'');
        }
        // for objects in list node virtual node created, splitting line into two objects (if no empty dash used)
        boolean mergeLines = node.isListItem() && node.isListItemWithProperty();
        if (!mergeLines) {
            out.append('\n');
        }

        for (StructNode child : node.getChildren()) {
            // render dash and first item property as single line (when avoidPadding = true)
            renderNode(child, out, mergeLines);
            mergeLines = false;
        }
    }
}