q3url.cpp

奇趣公司比较新的qt/emd版本

/****************************************************************************
**
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#include "q3url.h"

#ifndef QT_NO_URL

#include "q3cstring.h"
#include "qdir.h"

// used by q3filedialog.cpp
bool qt_resolve_symlinks = true;

class Q3UrlPrivate
{
public:
    QString protocol;
    QString user;
    QString pass;
    QString host;
    QString path, cleanPath;
    QString refEncoded;
    QString queryEncoded;
    bool isValid;
    int port;
    bool cleanPathDirty;
};

/*!
    Replaces backslashes with slashes and removes multiple occurrences
    of slashes or backslashes if \c allowMultiple is false.
*/

static void slashify( QString& s, bool allowMultiple = true )
{
    bool justHadSlash = false;
    for ( int i = 0; i < (int)s.length(); i++ ) {
	if ( !allowMultiple && justHadSlash &&
	     ( s[ i ] == QLatin1Char('/') || s[ i ] == QLatin1Char('\\') ) ) {
	    s.remove( i, 1 );
	    --i;
	    continue;
	}
	if ( s[ i ] == QLatin1Char('\\') )
	    s[ i ] = QLatin1Char('/');
#if defined (Q_WS_MAC9)
	if ( s[ i ] == QLatin1Char(':') && (i == (int)s.length()-1 || s[ i + 1 ] != QLatin1Char('/') ) ) //mac colon's go away, unless after a protocol
		s[ i ] = QLatin1Char('/');
#endif
	if ( s[ i ] == QLatin1Char('/') )
	    justHadSlash = true;
	else
	    justHadSlash = false;
    }
}



/*!
    \class Q3Url q3url.h
    \brief The Q3Url class provides a URL parser and simplifies working with URLs.

    \compat

    The Q3Url class is provided for simple work with URLs. It can
    parse, decode, encode, etc.

    Q3Url works with the decoded path and encoded query in turn.

    Example:

    <tt>http://www.trolltech.com:80/cgi-bin/test%20me.pl?cmd=Hello%20you</tt>

    \table
    \header \i Function	    \i Returns
    \row \i \l protocol()   \i "http"
    \row \i \l host()	    \i "www.trolltech.com"
    \row \i \l port()	    \i 80
    \row \i \l path()	    \i "/cgi-bin/test&nbsp;me.pl"
    \row \i \l fileName()   \i "test&nbsp;me.pl"
    \row \i \l query()	    \i "cmd=Hello%20you"
    \endtable

    Example:

    <tt>http://doc.trolltech.com/qdockarea.html#lines</tt>

    \table
    \header \i Function	    \i Returns
    \row \i \l protocol()   \i "http"
    \row \i \l host()	    \i "doc.trolltech.com"
    \row \i \l fileName()   \i "qdockarea.html"
    \row \i \l ref()	    \i "lines"
    \endtable

    The individual parts of a URL can be set with setProtocol(),
    setHost(), setPort(), setPath(), setFileName(), setRef() and
    setQuery(). A URL could contain, for example, an ftp address which
    requires a user name and password; these can be set with setUser()
    and setPassword().

    Because path is always encoded internally you must not use "%00"
    in the path, although this is okay (but not recommended) for the
    query.

    Q3Url is normally used like this:

    \code
    Q3Url url( "http://www.trolltech.com" );
    // or
    Q3Url url( "file:///home/myself/Mail", "Inbox" );
    \endcode

    You can then access and manipulate the various parts of the URL.

    To make it easy to work with Q3Urls and QStrings, Q3Url implements
    the necessary cast and assignment operators so you can do
    following:

    \code
    Q3Url url( "http://www.trolltech.com" );
    QString s = url;
    // or
    QString s( "http://www.trolltech.com" );
    Q3Url url( s );
    \endcode

    Use the static functions, encode() and decode() to encode or
    decode a URL in a string. (They operate on the string in-place.)
    The isRelativeUrl() static function returns true if the given
    string is a relative URL.

    If you want to use a URL to work on a hierarchical structure (e.g.
    a local or remote filesystem), you might want to use the subclass
    Q3UrlOperator.

    \sa Q3UrlOperator
*/


/*!
    Constructs an empty URL that is invalid.
*/

Q3Url::Q3Url()
{
    d = new Q3UrlPrivate;
    d->isValid = false;
    d->port = -1;
    d->cleanPathDirty = true;
}

/*!
    Constructs a URL by parsing the string \a url.

    If you pass a string like "/home/qt", the "file" protocol is
    assumed.
*/

Q3Url::Q3Url( const QString& url )
{
    d = new Q3UrlPrivate;
    d->protocol = QLatin1String("file");
    d->port = -1;
    parse( url );
}

/*!
    Copy constructor. Copies the data of \a url.
*/

Q3Url::Q3Url( const Q3Url& url )
{
    d = new Q3UrlPrivate;
    *d = *url.d;
}

/*!
    Returns true if \a url is relative; otherwise returns false.
*/

bool Q3Url::isRelativeUrl( const QString &url )
{
    int colon = url.find( QLatin1String(":") );
    int slash = url.find( QLatin1String("/") );

    return ( slash != 0 && ( colon == -1 || ( slash != -1 && colon > slash ) ) );
}

/*!
    Constructs an URL taking \a url as the base (context) and
    \a relUrl as a relative URL to \a url. If \a relUrl is not relative,
    \a relUrl is taken as the new URL.

    For example, the path of
    \code
    Q3Url url( "ftp://ftp.trolltech.com/qt/source", "qt-2.1.0.tar.gz" );
    \endcode
    will be "/qt/srource/qt-2.1.0.tar.gz".

    On the other hand,
    \code
    Q3Url url( "ftp://ftp.trolltech.com/qt/source", "/usr/local" );
    \endcode
    will result in a new URL, "ftp://ftp.trolltech.com/usr/local",
    because "/usr/local" isn't relative.

    Similarly,
    \code
    Q3Url url( "ftp://ftp.trolltech.com/qt/source", "file:///usr/local" );
    \endcode
    will result in a new URL, with "/usr/local" as the path
    and "file" as the protocol.

    Normally it is expected that the path of \a url points to a
    directory, even if the path has no slash at the end. But if you
    want the constructor to handle the last part of the path as a file
    name if there is no slash at the end, and to let it be replaced by
    the file name of \a relUrl (if it contains one), set \a checkSlash
    to true.
*/

Q3Url::Q3Url( const Q3Url& url, const QString& relUrl, bool checkSlash )
{
    d = new Q3UrlPrivate;
    QString rel = relUrl;
    slashify( rel );

    Q3Url urlTmp( url );
    if ( !urlTmp.isValid() ) {
	urlTmp.reset();
    }
    if ( isRelativeUrl( rel ) ) {
	if ( rel[ 0 ] == QLatin1Char('#') ) {
	    *this = urlTmp;
	    rel.remove( (uint)0, 1 );
	    decode( rel );
	    setRef( rel );
	} else if ( rel[ 0 ] == QLatin1Char('?') ) {
	    *this = urlTmp;
	    rel.remove( (uint)0, 1 );
	    setQuery( rel );
	} else {
	    decode( rel );
	    *this = urlTmp;
	    setRef( QString() );
	    if ( checkSlash && d->cleanPath[(int)path().length()-1] != QLatin1Char('/') ) {
		if ( isRelativeUrl( path() ) )
		    setEncodedPathAndQuery( rel );
		else
		    setFileName( rel );
	    } else {
		QString p = urlTmp.path();
		if ( p.isEmpty() ) {
		    // allow URLs like "file:foo"
		    if ( !d->host.isEmpty() && !d->user.isEmpty() && !d->pass.isEmpty() )
			p = QLatin1String("/");
		}
		if ( !p.isEmpty() && p.right(1)!=QLatin1String("/") )
		    p += QLatin1String("/");
		p += rel;
		d->path = p;
		d->cleanPathDirty = true;
	    }
	}
    } else {
	if ( rel[ 0 ] == QChar( QLatin1Char('/') ) ) {
	    *this = urlTmp;
	    setEncodedPathAndQuery( rel );
	} else {
	    *this = rel;
	}
    }
}

/*!
    Destructor.
*/

Q3Url::~Q3Url()
{
    delete d;
    d = 0;
}

/*!
    Returns the protocol of the URL. Typically, "file", "http", "ftp",
    etc.

    \sa setProtocol()
*/

QString Q3Url::protocol() const
{
    return d->protocol;
}

/*!
    Sets the protocol of the URL to \a protocol. Typically, "file",
    "http", "ftp", etc.

    \sa protocol()
*/

void Q3Url::setProtocol( const QString& protocol )
{
    d->protocol = protocol;
    if ( hasHost() )
	d->isValid = true;
}

/*!
    Returns the username of the URL.

    \sa setUser() setPassword()
*/

QString Q3Url::user() const
{
    return  d->user;
}

/*!
    Sets the username of the URL to \a user.

    \sa user() setPassword()
*/

void Q3Url::setUser( const QString& user )
{
    d->user = user;
}

/*!
    Returns true if the URL contains a username; otherwise returns
    false.

    \sa setUser() setPassword()
*/

bool Q3Url::hasUser() const
{
    return !d->user.isEmpty();
}

/*!
    Returns the password of the URL.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa setPassword() setUser()
*/

QString Q3Url::password() const
{
    return d->pass;
}

/*!
    Sets the password of the URL to \a pass.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa password() setUser()
*/

void Q3Url::setPassword( const QString& pass )
{
    d->pass = pass;
}

/*!
    Returns true if the URL contains a password; otherwise returns
    false.

    \warning Passwords passed in URLs are normally \e insecure; this
    is due to the mechanism, not because of Qt.

    \sa setPassword() setUser()
*/

bool Q3Url::hasPassword() const
{
    return !d->pass.isEmpty();
}

/*!
    Returns the hostname of the URL.

    \sa setHost() hasHost()
*/

QString Q3Url::host() const
{
    return d->host;
}

/*!
    Sets the hostname of the URL to \a host.

    \sa host() hasHost()
*/

void Q3Url::setHost( const QString& host )
{
    d->host = host;
    if ( !d->protocol.isNull() && d->protocol != QLatin1String("file") )
	d->isValid = true;
}