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/*
* linklocator.h
*
* Copyright (c) 2002 Dave Corrie <kde@davecorrie.com>
*
* This file is part of KMail.
*
* KMail is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LINKLOCATOR_H_INCLUDED
#define LINKLOCATOR_H_INCLUDED
#include <tqstring.h>
#include <tqmap.h>
#include <kdemacros.h>
/**
* LinkLocator assists in identifying sections of text that can
* usefully be converted in hyperlinks in html. It is intended
* to be used in two ways: either by calling @ref convertToHtml()
* to convert a plaintext string into html, or to be derived from
* where more control is needed.
*
* @short Identifies URLs and email addresses embedded in plaintext.
* @author Dave Corrie <kde@davecorrie.com>
*/
class TDE_EXPORT LinkLocator
{
public:
/**
* Constructs a LinkLocator that will search a plaintext string
* from a given starting point.
*
* @param text The string in which to search.
* @param pos An index into 'text' from where the search
* should begin.
*/
LinkLocator(const TQString& text, int pos = 0);
/**
* Sets the maximum length of URLs that will be matched by
* @ref getUrl(). By default, this is set to 4096
* characters. The reason for this limit is that there may
* be possible security implications in handling URLs of
* unlimited length.
*
* @param length The new maximum length of URLs that will be
* matched by @ref getUrl().
*/
void setMaxUrlLen(int length);
/**
* @return The current limit on the maximum length of a URL.
*
* @see setMaxUrlLen().
*/
int maxUrlLen() const;
/**
* Sets the maximum length of email addresses that will be
* matched by @ref getEmailAddress(). By default, this is
* set to 255 characters. The reason for this limit is that
* there may be possible security implications in handling
* addresses of unlimited length.
*
* @param length The new maximum length of email addresses
* that will be matched by @ref getEmailAddress().
*/
void setMaxAddressLen(int length);
/**
* @return The current limit on the maximum length of an email
* address.
*
* @see setMaxAddressLen().
*/
int maxAddressLen() const;
/**
* Attempts to grab a URL starting at the current scan position.
* If there is no URL at the current scan position, then an empty
* string is returned. If a URL is found, the current scan position
* is set to the index of the last character in the URL.
*
* @return The URL at the current scan position, or an empty string.
*/
TQString getUrl();
/**
* Attempts to grab an email address. If there is an @ symbol at the
* current scan position, then the text will be searched both backwards
* and forwards to find the email address. If there is no @ symbol at
* the current scan position, an empty string is returned. If an address
* is found, then the current scan position is set to the index of the
* last character in the address.
*
* @return The email address at the current scan position, or an empty
* string.
*/
TQString getEmailAddress();
/**
* Converts plaintext into html. The following characters are converted to HTML
* entities: & " < >. Newlines are also preserved.
*
* @param plainText The text to be converted into HTML.
* @param flags The flags to consider when processing plainText.
* Currently supported flags are:
* - PreserveSpaces, preserves the appearance of
* sequences of space and tab
* characters in the resulting HTML.
* - ReplaceSmileys, replace text smileys with
* emoticon images.
* - IgnoreUrls, doesn't parse any URLs.
* - HighlightText, interprets text highlighting markup
* like *bold*, _underlined_ and
* /italic/.
* @param maxUrlLen The maximum length of permitted URLs. (See
* @ref maxUrlLen().)
* @param maxAddressLen The maximum length of permitted email addresses.
* (See @ref maxAddressLen().)
* @return An HTML version of the text supplied in the 'plainText' parameter,
* suitable for inclusion in the BODY of an HTML document.
*/
static TQString convertToHtml(const TQString& plainText, int flags = 0,
int maxUrlLen = 4096, int maxAddressLen = 255);
static const int PreserveSpaces = 0x01;
static const int ReplaceSmileys = 0x02;
static const int IgnoreUrls = 0x04;
static const int HighlightText = 0x08;
/** Embed the given PNG image into a data URL.
* @param iconPath path to the PNG image
* @return A data URL, TQString() if the image could not be read.
*/
static TQString pngToDataUrl( const TQString & iconPath );
protected:
/**
* The plaintext string being scanned for URLs and email addresses.
*/
TQString mText;
/**
* The current scan position.
*/
int mPos;
private:
bool atUrl() const;
bool isEmptyUrl(const TQString& url);
/**
* Replaces smiley text with an <img> tag containing the relevant image.
* For an emoticon text to be recognised it has to match
* "(^|\s+)text(\s+|$)"
* @return An HTML String with <img> for an emoticon
*/
TQString getEmoticon();
/**
* Highlight text according to *bold*, /italic/ and _underlined_ markup.
* @return A HTML string.
*/
TQString highlightedText();
int mMaxUrlLen;
int mMaxAddressLen;
// maps the smiley text to the corresponding emoticon name
static TQMap<TQString, TQString> *s_smileyEmoticonNameMap;
// cache for the HTML representation of a smiley
static TQMap<TQString, TQString> *s_smileyEmoticonHTMLCache;
};
#endif // LINKLOCATOR_H_INCLUDED
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