/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */

/* libwpd

 * Version: MPL 2.0 / LGPLv2.1+

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * Major Contributor(s):

 * Copyright (C) 2004 Marc Maurer (uwog@uwog.net)

 * Copyright (C) 2004 Fridrich Strba (fridrich.strba@bluewin.ch)

 *

 * For minor contributions see the git repository.

 *

 * Alternatively, the contents of this file may be used under the terms

 * of the GNU Lesser General Public License Version 2.1 or later

 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are

 * applicable instead of those above.

 *

 * For further information visit http://libwpd.sourceforge.net

 */

/* "This product is not manufactured, approved, or supported by

 * Corel Corporation or Corel Corporation Limited."

 */

#include "WP3Parser.h"

#include <memory>

#include "WPXHeader.h"

#include "WP3Part.h"

#include "WP3ContentListener.h"

#include "WP3StylesListener.h"

#include "WP3ResourceFork.h"

#include "libwpd_internal.h"

#include "WPXTable.h"

WP3Parser::WP3Parser(librevenge::RVNGInputStream *input, WPXHeader *header, WPXEncryption *encryption) :

	WPXParser(input, header, encryption)

{

}

WP3Parser::~WP3Parser()

{

}

WP3ResourceFork *WP3Parser::getResourceFork(librevenge::RVNGInputStream *input, WPXEncryption *encryption)

{

	// Certain WP2 documents actually don't contain resource fork, so check for its existence

	if (!getHeader() || getHeader()->getDocumentOffset() <= 0x10)

	{

		WPD_DEBUG_MSG(("WP3Parser: Document does not contain resource fork\n"));

		return nullptr;

	}

	return new WP3ResourceFork(input, encryption);

}

void WP3Parser::parse(librevenge::RVNGInputStream *input, WPXEncryption *encryption, WP3Listener *listener)

{

	listener->startDocument();

	input->seek(getHeader()->getDocumentOffset(), librevenge::RVNG_SEEK_SET);

	WPD_DEBUG_MSG(("WordPerfect: Starting document body parse (position = %ld)\n",(long)input->tell()));

	parseDocument(input, encryption, listener);

	listener->endDocument();

}

// parseDocument: parses a document body (may call itself recursively, on other streams, or itself)

void WP3Parser::parseDocument(librevenge::RVNGInputStream *input, WPXEncryption *encryption, WP3Listener *listener)

{

	while (!input->isEnd())

	{

		unsigned char readVal;

		readVal = readU8(input, encryption);

		if (readVal == 0 || readVal == 0x7F || readVal == 0xFF)

		{

			// FIXME: VERIFY: is this IF clause correct? (0xFF seems to be OK at least)

			// do nothing: this token is meaningless and is likely just corruption

		}

		else if (readVal >= (unsigned char)0x01 && readVal <= (unsigned char)0x1F)

		{

			// control characters ?

		}

		else if (readVal >= (unsigned char)0x20 && readVal <= (unsigned char)0x7E)

		{

			listener->insertCharacter(readVal);

		}

		else

		{

			std::unique_ptr<WP3Part> part(WP3Part::constructPart(input, encryption, readVal));

			if (part)

				part->parse(listener);

		}

	}

}

void WP3Parser::parse(librevenge::RVNGTextInterface *textInterface)

{

	librevenge::RVNGInputStream *input = getInput();

	WPXEncryption *encryption = getEncryption();

	std::list<WPXPageSpan> pageList;

	WPXTableList tableList;

	WP3ResourceFork *resourceFork = nullptr;

	std::vector<WP3SubDocument *> subDocuments;

	try

	{

		resourceFork = getResourceFork(input, encryption);

		// do a "first-pass" parse of the document

		// gather table border information, page properties (per-page)

		WP3StylesListener stylesListener(pageList, tableList, subDocuments);

		stylesListener.setResourceFork(resourceFork);

		parse(input, encryption, &stylesListener);

		// postprocess the pageList == remove duplicate page spans due to the page breaks

		std::list<WPXPageSpan>::iterator previousPage = pageList.begin();

		for (std::list<WPXPageSpan>::iterator Iter=pageList.begin(); Iter != pageList.end(); /* Iter++ */)

		{

			if ((Iter != previousPage) && (*previousPage==*Iter))

			{

				(*previousPage).setPageSpan((*previousPage).getPageSpan() + (*Iter).getPageSpan());

				Iter = pageList.erase(Iter);

			}

			else

			{

				previousPage = Iter;

				++Iter;

			}

		}

		// second pass: here is where we actually send the messages to the target app

		// that are necessary to emit the body of the target document

		WP3ContentListener listener(pageList, subDocuments, textInterface); // FIXME: SHOULD BE CONTENT_LISTENER, AND SHOULD BE PASSED TABLE DATA!

		listener.setResourceFork(resourceFork);

		parse(input, encryption, &listener);

		// cleanup section: free the used resources

		for (auto &subDocument : subDocuments)

		{

			if (subDocument)

				delete subDocument;

		}

		delete resourceFork;

	}

	catch (FileException)

	{

		WPD_DEBUG_MSG(("WordPerfect: File Exception. Parse terminated prematurely."));

		for (auto &subDocument : subDocuments)

		{

			if (subDocument)

				delete subDocument;

		}

		delete resourceFork;

		throw FileException();

	}

}

void WP3Parser::parseSubDocument(librevenge::RVNGTextInterface *textInterface)

{

	std::list<WPXPageSpan> pageList;

	WPXTableList tableList;

	std::vector<WP3SubDocument *> subDocuments;

	librevenge::RVNGInputStream *input = getInput();

	try

	{

		WP3StylesListener stylesListener(pageList, tableList, subDocuments);

		stylesListener.startSubDocument();

		parseDocument(input, nullptr, &stylesListener);

		stylesListener.endSubDocument();

		input->seek(0, librevenge::RVNG_SEEK_SET);

		WP3ContentListener listener(pageList, subDocuments, textInterface);

		listener.startSubDocument();

		parseDocument(input, nullptr, &listener);

		listener.endSubDocument();

		for (auto &subDocument : subDocuments)

			if (subDocument)

				delete subDocument;

	}

	catch (FileException)

	{

		WPD_DEBUG_MSG(("WordPerfect: File Exception. Parse terminated prematurely."));

		for (auto &subDocument : subDocuments)

			if (subDocument)

				delete subDocument;

		throw FileException();

	}

}

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