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PlantUML is a component that allows to quickly write diagrams from text.
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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
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 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the MIT License.
 *
 * See http://opensource.org/licenses/MIT
 *
 * 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,
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 * IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this MIT license.
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 * The generated images can then be used without any reference to the MIT license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
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 *
 * This is the IGY distribution (Install GraphViz by Yourself).
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 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 *
 */
package net.sourceforge.plantuml.yaml.parser;

import java.util.List;

import net.sourceforge.plantuml.utils.Peeker;
import net.sourceforge.plantuml.utils.PeekerUtils;

public class YamlParser {

	public Monomorph parse(List lines) {
		final IndentationStack indentationStack = new IndentationStack();
		final YamlBuilder yamlBuilder = new YamlBuilder();

		for (Peeker peeker = PeekerUtils.peeker(lines); peeker.peek(0) != null; peeker.jump()) {

			final YamlLine yamlLine = YamlLine.build(peeker.peek(0));
			if (yamlLine.getType() == YamlLineType.EMPTY_LINE)
				continue;

			if (yamlLine.getType() == YamlLineType.NO_KEY_ONLY_TEXT)
				throw new YamlSyntaxException("YamlLineType.NO_KEY_ONLY_TEXT");

			if (yamlLine.getType() == YamlLineType.PLAIN_DASH) {
				yamlBuilder.onListItemPlainDash();
				continue;
			}

			if (indentationStack.size() == 0)
				indentationStack.push(yamlLine.getIndent());

			if (yamlLine.getIndent() > indentationStack.peek()) {
				yamlBuilder.increaseIndentation();
				indentationStack.push(yamlLine.getIndent());
			} else
				while (yamlLine.getIndent() < indentationStack.peek()) {
					yamlBuilder.decreaseIndentation();
					indentationStack.pop();
				}

			if (yamlLine.getIndent() == indentationStack.peek()) {
				if (yamlLine.isListItem()) {
					if (yamlLine.getType() == YamlLineType.KEY_ONLY)
						yamlBuilder.onListItemOnlyKey(yamlLine.getKey());
					else if (yamlLine.getType() == YamlLineType.PLAIN_ELEMENT_LIST)
						yamlBuilder.onListItemOnlyValue(yamlLine.getValue());
					else if (yamlLine.getType() == YamlLineType.KEY_AND_VALUE)
						yamlBuilder.onListItemKeyAndValue(yamlLine.getKey(), yamlLine.getValue());
					else if (yamlLine.getType() == YamlLineType.KEY_AND_FLOW_SEQUENCE)
						yamlBuilder.onListItemKeyAndFlowSequence(yamlLine.getKey(), yamlLine.getValues());
					else
						throw new UnsupportedOperationException("wip3 " + yamlLine);
				} else if (yamlLine.getType() == YamlLineType.KEY_ONLY) {
					final YamlLine next = peekNext(peeker);
					if (next == null || next.getIndent() <= yamlLine.getIndent())
						yamlBuilder.onKeyAndValue(yamlLine.getKey(), "");
					else if (next.getType() == YamlLineType.NO_KEY_ONLY_TEXT)
						yamlBuilder.onKeyAndValue(yamlLine.getKey(), peekNextOnlyText(peeker));
					else
						yamlBuilder.onOnlyKey(yamlLine.getKey());
				} else if (yamlLine.getType() == YamlLineType.KEY_AND_VALUE)
					yamlBuilder.onKeyAndValue(yamlLine.getKey(), yamlLine.getValue());
				else if (yamlLine.getType() == YamlLineType.KEY_AND_BLOCK_STYLE)
					yamlBuilder.onKeyAndValue(yamlLine.getKey(), getBlockStyleString(yamlLine.getIndent(), peeker));
				else if (yamlLine.getType() == YamlLineType.KEY_AND_FLOW_SEQUENCE)
					yamlBuilder.onKeyAndFlowSequence(yamlLine.getKey(), yamlLine.getValues());
				else
					throw new UnsupportedOperationException("wip4 " + yamlLine);

			} else
				throw new UnsupportedOperationException("wip5 " + yamlLine);
		}

		return yamlBuilder.getResult();

	}

	private String peekNextOnlyText(Peeker peeker) {
		final StringBuilder result = new StringBuilder();
		do {
			final String peek = peeker.peek(1);
			if (peek == null)
				return result.toString();
			final YamlLine next = YamlLine.build(peek);
			if (next != null && next.getType() == YamlLineType.EMPTY_LINE) {
				peeker.jump();
				continue;
			}
			if (next.getType() == YamlLineType.NO_KEY_ONLY_TEXT) {
				if (result.length() > 0)
					result.append(" ");
				result.append(next.getValue());
				peeker.jump();
				continue;
			}
			return result.toString();
		} while (true);
	}

	private YamlLine peekNext(Peeker peeker) {
		int i = 1;
		do {
			final String peek = peeker.peek(i);
			if (peek == null)
				return null;
			final YamlLine next = YamlLine.build(peek);
			if (next != null && next.getType() == YamlLineType.EMPTY_LINE)
				i++;
			else
				return next;
		} while (true);
	}

	private String getBlockStyleString(int indent, Peeker peeker) {
		final StringBuilder result = new StringBuilder();
		while (peeker.peek(1) != null) {
			final String line = peeker.peek(1);
			if (line == null)
				return result.toString();
			final YamlLine yamlLine = YamlLine.build(line);
			if (yamlLine.getType() != YamlLineType.NO_KEY_ONLY_TEXT && yamlLine.getType() != YamlLineType.EMPTY_LINE
					&& yamlLine.getIndent() <= indent)
				return result.toString();

			result.append(cleanBlockStyle(indent, line));
			result.append("\n");
			peeker.jump();

		}
		return result.toString();
	}

	private static String cleanBlockStyle(int indent, String s) {
		// Not finished!
		return s.trim();
	}

}