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