dk.jyskebank.tools.enunciate.modules.openapi.yaml.IndentationPrinter Maven / Gradle / Ivy

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Enunciate module that generates OpenAPI output
There is a newer version: 1.1.5
/*
 * Copyright © 2017-2018 Jyske Bank
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dk.jyskebank.tools.enunciate.modules.openapi.yaml;

import org.apache.commons.lang.StringUtils;

import java.util.ArrayDeque;
import java.util.Deque;

/**
 * Printer helping keep track of YAML indentation levels.
 */
public class IndentationPrinter {
    private static final String DOS_NEWLINE = "\r\n";
    private static final String SEQUENCE_PREFIX = "- ";
    public static final String JSON_ = "json_";
    private final StringBuilder sb = new StringBuilder();
    private Deque indentLevelStack = new ArrayDeque<>();
    private Deque memoryStack = new ArrayDeque<>();
    private boolean itemFollows;
    private boolean removeObjectPrefix;

    public IndentationPrinter(String initialIndentation, boolean removeObjectPrefix) {
        this.removeObjectPrefix = removeObjectPrefix;
        indentLevelStack.push(new IndentLevel(initialIndentation));
    }

    private IndentLevel getActive() {
        return indentLevelStack.peek();
    }

    public void itemFollows() {
        this.itemFollows = true;
    }

    public IndentationPrinter item(String... lines) {
        itemFollows = true;
        return add(lines);
    }

    public IndentationPrinter add(String... lines) {
        addIndentationForAllButFirstLine();
        for (String line : lines) {
            if (removeObjectPrefix) {
                sb.append(removeJsonPrefix(line));
            } else {
                sb.append(line);
            }
        }
        return this;
    }

    private String removeJsonPrefix(String line) {
        return StringUtils.remove(line, JSON_);
    }

    private void addIndentationForAllButFirstLine() {
        if (sb.length() != 0) {
            String indent = getActive().indentation;
            if (itemFollows) {
                indent = indent.replaceAll("  $", SEQUENCE_PREFIX);
                itemFollows = false;
            }
            sb.append(DOS_NEWLINE).append(indent);
        }
    }

    public IndentationPrinter nextLevel() {
        indentLevelStack.push(getActive().next());
        return this;
    }

    public IndentationPrinter prevLevel() {
        if (indentLevelStack.size() == 1) {
            throw new IllegalStateException("Cannot go beyond initial indentation");
        }
        indentLevelStack.pop();
        return this;
    }

    public IndentationPrinter pushNextLevel() {
        memoryStack.push(getActive());
        return nextLevel();
    }

    public IndentationPrinter popLevel() {
        IndentLevel revertTo = memoryStack.pop();
        while (indentLevelStack.peek() != revertTo) {
            indentLevelStack.pop();
        }
        return this;
    }

    public String toString() {
        return sb.toString();
    }

    public static class IndentLevel {
        private static final String INDENT_PREFIX = "  ";

        public final String indentation;

        public IndentLevel(String indentation) {
            this.indentation = indentation;
        }

        public IndentLevel next() {
            return new IndentLevel(indentation.replace('-', ' ') + INDENT_PREFIX);
        }
    }
}