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qt3/src/kernel/qtranslator.cpp

1479 lines
38 KiB

/****************************************************************************
**
** Localization database support.
**
** Created : 980906
**
** Copyright (C) 1998-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qplatformdefs.h"
// POSIX Large File Support redefines open -> open64
static inline int qt_open(const char *pathname, int flags, mode_t mode)
{ return ::open(pathname, flags, mode); }
#if defined(open)
# undef open
#endif
// POSIX Large File Support redefines truncate -> truncate64
#if defined(truncate)
# undef truncate
#endif
#include "qtranslator.h"
#ifndef QT_NO_TRANSLATION
#include "qfileinfo.h"
#include "qwidgetlist.h"
#include "qintdict.h"
#include "qstring.h"
#include "qapplication.h"
#include "qfile.h"
#include "qbuffer.h"
#include "qdatastream.h"
#include "qmap.h"
#include "qtl.h"
#if defined(Q_OS_UNIX)
#define QT_USE_MMAP
#endif
// most of the headers below are already included in qplatformdefs.h
// also this lacks Large File support but that's probably irrelevant
#if defined(QT_USE_MMAP)
// for mmap
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>
// for htonl
#include <netinet/in.h>
#endif
#include <stdlib.h>
/*
$ mcookie
3cb86418caef9c95cd211cbf60a1bddd
$
*/
// magic number for the file
static const int MagicLength = 16;
static const uchar magic[MagicLength] = {
0x3c, 0xb8, 0x64, 0x18, 0xca, 0xef, 0x9c, 0x95,
0xcd, 0x21, 0x1c, 0xbf, 0x60, 0xa1, 0xbd, 0xdd
};
static bool match( const char* found, const char* target )
{
// 0 means anything, "" means empty
return found == 0 || qstrcmp( found, target ) == 0;
}
#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
/*
Yes, unfortunately, we have code here that depends on endianness.
The candidate is big endian (it comes from a .qm file) whereas the
target endianness depends on the system Qt is running on.
*/
#ifdef Q_OS_TEMP
static int __cdecl cmp_uint32_little( const void* target, const void* candidate )
#else
static int cmp_uint32_little( const void* target, const void* candidate )
#endif
{
const uchar* t = (const uchar*) target;
const uchar* c = (const uchar*) candidate;
return t[3] != c[0] ? (int) t[3] - (int) c[0]
: t[2] != c[1] ? (int) t[2] - (int) c[1]
: t[1] != c[2] ? (int) t[1] - (int) c[2]
: (int) t[0] - (int) c[3];
}
#ifdef Q_OS_TEMP
static int __cdecl cmp_uint32_big( const void* target, const void* candidate )
#else
static int cmp_uint32_big( const void* target, const void* candidate )
#endif
{
const uchar* t = (const uchar*) target;
const uchar* c = (const uchar*) candidate;
return t[0] != c[0] ? (int) t[0] - (int) c[0]
: t[1] != c[1] ? (int) t[1] - (int) c[1]
: t[2] != c[2] ? (int) t[2] - (int) c[2]
: (int) t[3] - (int) c[3];
}
#if defined(Q_C_CALLBACKS)
}
#endif
static int systemWordSize = 0;
static bool systemBigEndian;
static uint elfHash( const char * name )
{
const uchar *k;
uint h = 0;
uint g;
if ( name ) {
k = (const uchar *) name;
while ( *k ) {
h = ( h << 4 ) + *k++;
if ( (g = (h & 0xf0000000)) != 0 )
h ^= g >> 24;
h &= ~g;
}
}
if ( !h )
h = 1;
return h;
}
extern bool qt_detectRTLLanguage();
class QTranslatorPrivate {
public:
struct Offset {
Offset()
: h( 0 ), o( 0 ) { }
Offset( const QTranslatorMessage& m, int offset )
: h( m.hash() ), o( offset ) { }
bool operator<( const Offset&k ) const {
return ( h != k.h ) ? h < k.h : o < k.o;
}
Q_DUMMY_COMPARISON_OPERATOR(QTranslatorPrivate::Offset)
uint h;
uint o;
};
enum { Contexts = 0x2f, Hashes = 0x42, Messages = 0x69 };
QTranslatorPrivate() :
unmapPointer( 0 ), unmapLength( 0 ),
messageArray( 0 ), offsetArray( 0 ), contextArray( 0 )
#ifndef QT_NO_TRANSLATION_BUILDER
, messages( 0 )
#endif
{ }
// QTranslator must finalize this before deallocating it
// for mmap'ed files, this is what needs to be unmapped.
char * unmapPointer;
unsigned int unmapLength;
// for squeezed but non-file data, this is what needs to be deleted
QByteArray * messageArray;
QByteArray * offsetArray;
QByteArray * contextArray;
#ifndef QT_NO_TRANSLATION_BUILDER
QMap<QTranslatorMessage, void *> * messages;
#endif
#ifdef Q_WS_WIN
int oldPermissionLookup;
#endif
};
/*!
\class QTranslator
\brief The QTranslator class provides internationalization support for text
output.
\ingroup i18n
\ingroup environment
\mainclass
An object of this class contains a set of QTranslatorMessage
objects, each of which specifies a translation from a source
language to a target language. QTranslator provides functions to
look up translations, add new ones, remove them, load and save
them, etc.
The most common use of QTranslator is to: load a translator file
created with \link linguist-manual.book Qt Linguist\endlink,
install it using QApplication::installTranslator(), and use it via
QObject::tr(). For example:
\code
int main( int argc, char ** argv )
{
QApplication app( argc, argv );
QTranslator translator( 0 );
translator.load( "french.qm", "." );
app.installTranslator( &translator );
MyWidget m;
app.setMainWidget( &m );
m.show();
return app.exec();
}
\endcode
Note that the translator must be created \e before the
application's main window.
Most applications will never need to do anything else with this
class. The other functions provided by this class are useful for
applications that work on translator files.
We call a translation a "messsage". For this reason, translation
files are sometimes referred to as "message files".
It is possible to lookup a translation using findMessage() (as
tr() and QApplication::translate() do) and contains(), to insert a
new translation messsage using insert(), and to remove one using
remove().
Translation tools often need more information than the bare source
text and translation, for example, context information to help
the translator. But end-user programs that are using translations
usually only need lookup. To cater for these different needs,
QTranslator can use stripped translator files that use the minimum
of memory and which support little more functionality than
findMessage().
Thus, load() may not load enough information to make anything more
than findMessage() work. save() has an argument indicating
whether to save just this minimum of information or to save
everything.
"Everything" means that for each translation item the following
information is kept:
\list
\i The \e {translated text} - the return value from tr().
\i The input key:
\list
\i The \e {source text} - usually the argument to tr().
\i The \e context - usually the class name for the tr() caller.
\i The \e comment - a comment that helps disambiguate different uses
of the same text in the same context.
\endlist
\endlist
The minimum for each item is just the information necessary for
findMessage() to return the right text. This may include the
source, context and comment, but usually it is just a hash value
and the translated text.
For example, the "Cancel" in a dialog might have "Anuluj" when the
program runs in Polish (in this case the source text would be
"Cancel"). The context would (normally) be the dialog's class
name; there would normally be no comment, and the translated text
would be "Anuluj".
But it's not always so simple. The Spanish version of a printer
dialog with settings for two-sided printing and binding would
probably require both "Activado" and "Activada" as translations
for "Enabled". In this case the source text would be "Enabled" in
both cases, and the context would be the dialog's class name, but
the two items would have disambiguating comments such as
"two-sided printing" for one and "binding" for the other. The
comment enables the translator to choose the appropriate gender
for the Spanish version, and enables Qt to distinguish between
translations.
Note that when QTranslator loads a stripped file, most functions
do not work. The functions that do work with stripped files are
explicitly documented as such.
\sa QTranslatorMessage QApplication::installTranslator()
QApplication::removeTranslator() QObject::tr() QApplication::translate()
*/
/*!
\enum QTranslator::SaveMode
This enum type defines how QTranslator writes translation
files. There are two modes:
\value Everything files are saved with all available information
\value Stripped files are saved with just enough information for
end-user applications
Note that when QTranslator loads a stripped file, most functions do
not work. The functions that do work with stripped files are
explicitly documented as such.
*/
#if defined(Q_WS_WIN)
extern int qt_ntfs_permission_lookup;
#endif
/*!
Constructs an empty message file object that is not connected to
any file. The object is called \a name with parent \a parent.
*/
QTranslator::QTranslator( QObject * parent, const char * name )
: QObject( parent, name )
{
d = new QTranslatorPrivate;
#if defined(Q_WS_WIN)
d->oldPermissionLookup = qt_ntfs_permission_lookup;
#endif
}
/*!
Destroys the object and frees any allocated resources.
*/
QTranslator::~QTranslator()
{
if ( qApp )
qApp->removeTranslator( this );
clear();
delete d;
}
extern bool qt_detectRTLLanguage();
/*!
Loads \a filename, which may be an absolute file name or relative
to \a directory. The previous contents of this translator object
is discarded. Returns TRUE if the file is loaded successfully;
otherwise returns FALSE.
If the full file name does not exist, other file names are tried
in the following order:
\list 1
\i File name with \a suffix appended (".qm" if the \a suffix is
QString::null).
\i File name with text after a character in \a search_delimiters
stripped ("_." is the default for \a search_delimiters if it is
QString::null).
\i File name stripped and \a suffix appended.
\i File name stripped further, etc.
\endlist
For example, an application running in the fr_CA locale
(French-speaking Canada) might call load("foo.fr_ca",
"/opt/foolib"). load() would then try to open the first existing
readable file from this list:
\list 1
\i /opt/foolib/foo.fr_ca
\i /opt/foolib/foo.fr_ca.qm
\i /opt/foolib/foo.fr
\i /opt/foolib/foo.fr.qm
\i /opt/foolib/foo
\i /opt/foolib/foo.qm
\endlist
\sa save()
*/
bool QTranslator::load( const QString & filename, const QString & directory,
const QString & search_delimiters,
const QString & suffix )
{
clear();
QString prefix;
if ( filename[0] == '/'
#ifdef Q_WS_WIN
|| (filename[0] && filename[1] == ':') || filename[0] == '\\'
#endif
)
prefix = QString::fromLatin1( "" );
else
prefix = directory;
if ( prefix.length() ) {
if ( prefix[int(prefix.length()-1)] != '/' )
prefix += QChar( '/' );
}
QString fname = filename;
QString realname;
QString delims;
delims = search_delimiters.isNull() ?
QString::fromLatin1( "_." ) : search_delimiters;
#if defined(Q_WS_WIN)
qt_ntfs_permission_lookup--;
#endif
for ( ;; ) {
QFileInfo fi;
realname = prefix + fname;
fi.setFile( realname );
if ( fi.isReadable() )
break;
realname += suffix.isNull() ? QString::fromLatin1( ".qm" ) : suffix;
fi.setFile( realname );
if ( fi.isReadable() )
break;
int rightmost = 0;
for ( int i = 0; i < (int)delims.length(); i++ ) {
int k = fname.findRev( delims[i] );
if ( k > rightmost )
rightmost = k;
}
// no truncations? fail
if ( rightmost == 0 ) {
#if defined(Q_WS_WIN)
if (d->oldPermissionLookup != qt_ntfs_permission_lookup)
qt_ntfs_permission_lookup++;
#endif
return FALSE;
}
fname.truncate( rightmost );
}
#if defined(Q_WS_WIN)
if (d->oldPermissionLookup != qt_ntfs_permission_lookup)
qt_ntfs_permission_lookup++;
#endif
// realname is now the fully qualified name of a readable file.
#if defined(QT_USE_MMAP)
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifndef MAP_FAILED
#define MAP_FAILED -1
#endif
int f;
f = qt_open( QFile::encodeName(realname), O_RDONLY, 0666 );
if ( f < 0 ) {
// qDebug( "can't open %s: %s", realname.ascii(), strerror( errno ) );
return FALSE;
}
struct stat st;
if ( fstat( f, &st ) ) {
// qDebug( "can't stat %s: %s", realname.ascii(), strerror( errno ) );
return FALSE;
}
char * tmp;
tmp = (char*)mmap( 0, st.st_size, // any address, whole file
PROT_READ, // read-only memory
MAP_FILE | MAP_PRIVATE, // swap-backed map from file
f, 0 ); // from offset 0 of f
if ( !tmp || tmp == (char*)MAP_FAILED ) {
// qDebug( "can't mmap %s: %s", filename.ascii(), strerror( errno ) );
return FALSE;
}
::close( f );
d->unmapPointer = tmp;
d->unmapLength = st.st_size;
#else
QFile f( realname );
if ( !f.exists() )
return FALSE;
d->unmapLength = f.size();
d->unmapPointer = new char[d->unmapLength];
bool ok = FALSE;
if ( f.open(IO_ReadOnly) ) {
ok = d->unmapLength ==
(uint)f.readBlock( d->unmapPointer, d->unmapLength );
f.close();
}
if ( !ok ) {
delete [] d->unmapPointer;
d->unmapPointer = 0;
return FALSE;
}
#endif
return do_load( (const uchar *) d->unmapPointer, d->unmapLength );
}
/*!
\overload
\fn bool QTranslator::load( const uchar *data, int len )
Loads the .qm file data \a data of length \a len into the
translator. Returns TRUE if the data is loaded successfully;
otherwise returns FALSE.
The data is not copied. The caller must be able to guarantee that \a data
will not be deleted or modified.
*/
bool QTranslator::do_load( const uchar *data, int len )
{
if ( len < MagicLength || memcmp( data, magic, MagicLength ) != 0 ) {
clear();
return FALSE;
}
QByteArray array;
array.setRawData( (const char *) data, len );
QDataStream s( array, IO_ReadOnly );
bool ok = TRUE;
s.device()->at( MagicLength );
Q_UINT8 tag = 0;
Q_UINT32 blockLen = 0;
s >> tag >> blockLen;
while ( tag && blockLen ) {
if ( (Q_UINT32) s.device()->at() + blockLen > (Q_UINT32) len ) {
ok = FALSE;
break;
}
if ( tag == QTranslatorPrivate::Contexts && !d->contextArray ) {
d->contextArray = new QByteArray;
d->contextArray->setRawData( array.data() + s.device()->at(),
blockLen );
} else if ( tag == QTranslatorPrivate::Hashes && !d->offsetArray ) {
d->offsetArray = new QByteArray;
d->offsetArray->setRawData( array.data() + s.device()->at(),
blockLen );
} else if ( tag == QTranslatorPrivate::Messages && !d->messageArray ) {
d->messageArray = new QByteArray;
d->messageArray->setRawData( array.data() + s.device()->at(),
blockLen );
}
if ( !s.device()->at(s.device()->at() + blockLen) ) {
ok = FALSE;
break;
}
tag = 0;
blockLen = 0;
if ( !s.atEnd() )
s >> tag >> blockLen;
}
array.resetRawData( (const char *) data, len );
if ( qApp && qApp->translators && qApp->translators->contains(this) )
qApp->setReverseLayout( qt_detectRTLLanguage() );
return ok;
}
#ifndef QT_NO_TRANSLATION_BUILDER
/*!
Saves this message file to \a filename, overwriting the previous
contents of \a filename. If \a mode is \c Everything (the
default), all the information is preserved. If \a mode is \c
Stripped, any information that is not necessary for findMessage()
is stripped away.
\sa load()
*/
bool QTranslator::save( const QString & filename, SaveMode mode )
{
QFile f( filename );
if ( f.open( IO_WriteOnly ) ) {
squeeze( mode );
QDataStream s( &f );
s.writeRawBytes( (const char *)magic, MagicLength );
Q_UINT8 tag;
if ( d->offsetArray != 0 ) {
tag = (Q_UINT8) QTranslatorPrivate::Hashes;
Q_UINT32 oas = (Q_UINT32) d->offsetArray->size();
s << tag << oas;
s.writeRawBytes( d->offsetArray->data(), oas );
}
if ( d->messageArray != 0 ) {
tag = (Q_UINT8) QTranslatorPrivate::Messages;
Q_UINT32 mas = (Q_UINT32) d->messageArray->size();
s << tag << mas;
s.writeRawBytes( d->messageArray->data(), mas );
}
if ( d->contextArray != 0 ) {
tag = (Q_UINT8) QTranslatorPrivate::Contexts;
Q_UINT32 cas = (Q_UINT32) d->contextArray->size();
s << tag << cas;
s.writeRawBytes( d->contextArray->data(), cas );
}
return TRUE;
}
return FALSE;
}
#endif
/*!
Empties this translator of all contents.
This function works with stripped translator files.
*/
void QTranslator::clear()
{
if ( d->unmapPointer && d->unmapLength ) {
#if defined(QT_USE_MMAP)
munmap( d->unmapPointer, d->unmapLength );
#else
delete [] d->unmapPointer;
#endif
d->unmapPointer = 0;
d->unmapLength = 0;
}
if ( d->messageArray ) {
d->messageArray->resetRawData( d->messageArray->data(),
d->messageArray->size() );
delete d->messageArray;
d->messageArray = 0;
}
if ( d->offsetArray ) {
d->offsetArray->resetRawData( d->offsetArray->data(),
d->offsetArray->size() );
delete d->offsetArray;
d->offsetArray = 0;
}
if ( d->contextArray ) {
d->contextArray->resetRawData( d->contextArray->data(),
d->contextArray->size() );
delete d->contextArray;
d->contextArray = 0;
}
#ifndef QT_NO_TRANSLATION_BUILDER
delete d->messages;
d->messages = 0;
#endif
if ( qApp ) {
qApp->setReverseLayout( qt_detectRTLLanguage() );
QWidgetList *list = QApplication::topLevelWidgets();
QWidgetListIt it( *list );
QWidget *w;
while ( ( w=it.current() ) != 0 ) {
++it;
if (!w->isDesktop())
qApp->postEvent( w, new QEvent( QEvent::LanguageChange ) );
}
delete list;
}
}
#ifndef QT_NO_TRANSLATION_BUILDER
/*!
Converts this message file to the compact format used to store
message files on disk.
You should never need to call this directly; save() and other
functions call it as necessary. \a mode is for internal use.
\sa save() unsqueeze()
*/
void QTranslator::squeeze( SaveMode mode )
{
if ( !d->messages ) {
if ( mode == Stripped )
unsqueeze();
else
return;
}
QMap<QTranslatorMessage, void *> * messages = d->messages;
d->messages = 0;
clear();
d->messageArray = new QByteArray;
d->offsetArray = new QByteArray;
QMap<QTranslatorPrivate::Offset, void *> offsets;
QDataStream ms( *d->messageArray, IO_WriteOnly );
QMap<QTranslatorMessage, void *>::Iterator it = messages->begin(), next;
int cpPrev = 0, cpNext = 0;
for ( it = messages->begin(); it != messages->end(); ++it ) {
cpPrev = cpNext;
next = it;
++next;
if ( next == messages->end() )
cpNext = 0;
else
cpNext = (int) it.key().commonPrefix( next.key() );
offsets.replace( QTranslatorPrivate::Offset(it.key(),
ms.device()->at()), (void*)0 );
it.key().write( ms, mode == Stripped,
(QTranslatorMessage::Prefix) QMAX(cpPrev, cpNext + 1) );
}
d->offsetArray->resize( 0 );
QMap<QTranslatorPrivate::Offset, void *>::Iterator offset;
offset = offsets.begin();
QDataStream ds( *d->offsetArray, IO_WriteOnly );
while ( offset != offsets.end() ) {
QTranslatorPrivate::Offset k = offset.key();
++offset;
ds << (Q_UINT32)k.h << (Q_UINT32)k.o;
}
if ( mode == Stripped ) {
QAsciiDict<int> contextSet( 1511 );
int baudelaire;
for ( it = messages->begin(); it != messages->end(); ++it )
contextSet.replace( it.key().context(), &baudelaire );
Q_UINT16 hTableSize;
if ( contextSet.count() < 200 )
hTableSize = ( contextSet.count() < 60 ) ? 151 : 503;
else if ( contextSet.count() < 2500 )
hTableSize = ( contextSet.count() < 750 ) ? 1511 : 5003;
else
hTableSize = 15013;
QIntDict<char> hDict( hTableSize );
QAsciiDictIterator<int> c = contextSet;
while ( c.current() != 0 ) {
hDict.insert( (long) (elfHash(c.currentKey()) % hTableSize),
c.currentKey() );
++c;
}
/*
The contexts found in this translator are stored in a hash
table to provide fast lookup. The context array has the
following format:
Q_UINT16 hTableSize;
Q_UINT16 hTable[hTableSize];
Q_UINT8 contextPool[...];
The context pool stores the contexts as Pascal strings:
Q_UINT8 len;
Q_UINT8 data[len];
Let's consider the look-up of context "FunnyDialog". A
hash value between 0 and hTableSize - 1 is computed, say h.
If hTable[h] is 0, "FunnyDialog" is not covered by this
translator. Else, we check in the contextPool at offset
2 * hTable[h] to see if "FunnyDialog" is one of the
contexts stored there, until we find it or we meet the
empty string.
*/
d->contextArray = new QByteArray;
d->contextArray->resize( 2 + (hTableSize << 1) );
QDataStream t( *d->contextArray, IO_WriteOnly );
Q_UINT16 *hTable = new Q_UINT16[hTableSize];
memset( hTable, 0, hTableSize * sizeof(Q_UINT16) );
t << hTableSize;
t.device()->at( 2 + (hTableSize << 1) );
t << (Q_UINT16) 0; // the entry at offset 0 cannot be used
uint upto = 2;
for ( int i = 0; i < hTableSize; i++ ) {
const char *con = hDict.find( i );
if ( con == 0 ) {
hTable[i] = 0;
} else {
hTable[i] = (Q_UINT16) ( upto >> 1 );
do {
uint len = (uint) qstrlen( con );
len = QMIN( len, 255 );
t << (Q_UINT8) len;
t.writeRawBytes( con, len );
upto += 1 + len;
hDict.remove( i );
} while ( (con = hDict.find(i)) != 0 );
do {
t << (Q_UINT8) 0; // empty string (at least one)
upto++;
} while ( (upto & 0x1) != 0 ); // offsets have to be even
}
}
t.device()->at( 2 );
for ( int j = 0; j < hTableSize; j++ )
t << hTable[j];
delete [] hTable;
if ( upto > 131072 ) {
qWarning( "QTranslator::squeeze: Too many contexts" );
delete d->contextArray;
d->contextArray = 0;
}
}
delete messages;
}
/*!
Converts this message file into an easily modifiable data
structure, less compact than the format used in the files.
You should never need to call this function; it is called by
insert() and friends as necessary.
\sa squeeze()
*/
void QTranslator::unsqueeze()
{
if ( d->messages )
return;
d->messages = new QMap<QTranslatorMessage, void *>;
if ( !d->messageArray )
return;
QDataStream s( *d->messageArray, IO_ReadOnly );
for ( ;; ) {
QTranslatorMessage m( s );
if ( m.hash() == 0 )
break;
d->messages->insert( m, (void *) 0 );
}
}
/*!
Returns TRUE if this message file contains a message with the key
(\a context, \a sourceText, \a comment); otherwise returns FALSE.
This function works with stripped translator files.
(This is is a one-liner that calls findMessage().)
*/
bool QTranslator::contains( const char* context, const char* sourceText,
const char* comment ) const
{
return !findMessage( context, sourceText, comment ).translation().isNull();
}
/*!
Inserts \a message into this message file.
This function does \e not work with stripped translator files. It
may appear to, but that is not dependable.
\sa remove()
*/
void QTranslator::insert( const QTranslatorMessage& message )
{
unsqueeze();
d->messages->remove( message ); // safer
d->messages->insert( message, (void *) 0 );
}
/*!
\fn void QTranslator::insert( const char *, const char *, const QString & )
\overload
\obsolete
*/
/*!
Removes \a message from this translator.
This function works with stripped translator files.
\sa insert()
*/
void QTranslator::remove( const QTranslatorMessage& message )
{
unsqueeze();
d->messages->remove( message );
}
/*!
\fn void QTranslator::remove( const char *, const char * )
\overload
\obsolete
Removes the translation associated to the key (\a context, \a sourceText,
"") from this translator.
*/
#endif
/*!
\fn QString QTranslator::find( const char*, const char*, const char* ) const
\obsolete
Please use findMessage() instead.
Returns the translation for the key (\a context, \a sourceText,
\a comment) or QString::null if there is none in this translator.
*/
/*! Returns the QTranslatorMessage for the key
(\a context, \a sourceText, \a comment). If none is found,
also tries (\a context, \a sourceText, "").
*/
QTranslatorMessage QTranslator::findMessage( const char* context,
const char* sourceText,
const char* comment ) const
{
if ( context == 0 )
context = "";
if ( sourceText == 0 )
sourceText = "";
if ( comment == 0 )
comment = "";
#ifndef QT_NO_TRANSLATION_BUILDER
if ( d->messages ) {
QMap<QTranslatorMessage, void *>::ConstIterator it;
it = d->messages->find( QTranslatorMessage(context, sourceText,
comment) );
if ( it != d->messages->end() )
return it.key();
if ( comment[0] ) {
it = d->messages->find( QTranslatorMessage(context, sourceText,
"") );
if ( it != d->messages->end() )
return it.key();
}
return QTranslatorMessage();
}
#endif
if ( !d->offsetArray )
return QTranslatorMessage();
/*
Check if the context belongs to this QTranslator. If many translators are
installed, this step is necessary.
*/
if ( d->contextArray ) {
Q_UINT16 hTableSize = 0;
QDataStream t( *d->contextArray, IO_ReadOnly );
t >> hTableSize;
uint g = elfHash( context ) % hTableSize;
t.device()->at( 2 + (g << 1) );
Q_UINT16 off;
t >> off;
if ( off == 0 )
return QTranslatorMessage();
t.device()->at( 2 + (hTableSize << 1) + (off << 1) );
Q_UINT8 len;
char con[256];
for ( ;; ) {
t >> len;
if ( len == 0 || t.atEnd() )
return QTranslatorMessage();
t.readRawBytes( con, len );
con[len] = '\0';
if ( qstrcmp(con, context) == 0 )
break;
}
}
size_t numItems = d->offsetArray->size() / ( 2 * sizeof(Q_UINT32) );
if ( !numItems )
return QTranslatorMessage();
if ( systemWordSize == 0 )
qSysInfo( &systemWordSize, &systemBigEndian );
for ( ;; ) {
Q_UINT32 h = elfHash( QCString(sourceText) + comment );
char *r = (char *) bsearch( &h, d->offsetArray->data(), numItems,
2 * sizeof(Q_UINT32),
systemBigEndian ? cmp_uint32_big
: cmp_uint32_little );
if ( r != 0 ) {
// go back on equal key
while ( r != d->offsetArray->data() &&
cmp_uint32_big(r - 8, r) == 0 )
r -= 8;
QDataStream s( *d->offsetArray, IO_ReadOnly );
s.device()->at( r - d->offsetArray->data() );
Q_UINT32 rh, ro;
s >> rh >> ro;
QDataStream ms( *d->messageArray, IO_ReadOnly );
while ( rh == h ) {
ms.device()->at( ro );
QTranslatorMessage m( ms );
if ( match(m.context(), context)
&& match(m.sourceText(), sourceText)
&& match(m.comment(), comment) )
return m;
if ( s.atEnd() )
break;
s >> rh >> ro;
}
}
if ( !comment[0] )
break;
comment = "";
}
return QTranslatorMessage();
}
/*!
Returns TRUE if this translator is empty, otherwise returns FALSE.
This function works with stripped and unstripped translation files.
*/
bool QTranslator::isEmpty() const
{
return !( d->unmapPointer || d->unmapLength || d->messageArray ||
d->offsetArray || d->contextArray
#ifndef QT_NO_TRANSLATION_BUILDER
|| (d->messages && d->messages->count())
#endif
);
}
#ifndef QT_NO_TRANSLATION_BUILDER
/*!
Returns a list of the messages in the translator. This function is
rather slow. Because it is seldom called, it's optimized for
simplicity and small size, rather than speed.
If you want to iterate over the list, you should iterate over a
copy, e.g.
\code
QValueList<QTranslatorMessage> list = myTranslator.messages();
QValueList<QTranslatorMessage>::Iterator it = list.begin();
while ( it != list.end() ) {
process_message( *it );
++it;
}
\endcode
*/
QValueList<QTranslatorMessage> QTranslator::messages() const
{
if ( d->messages )
return d->messages->keys();
((QTranslator *) this)->unsqueeze();
QValueList<QTranslatorMessage> result = d->messages->keys();
delete d->messages;
d->messages = 0;
return result;
}
#endif
/*!
\class QTranslatorMessage
\brief The QTranslatorMessage class contains a translator message and its
properties.
\ingroup i18n
\ingroup environment
This class is of no interest to most applications. It is useful
for translation tools such as \link linguist-manual.book Qt
Linguist\endlink. It is provided simply to make the API complete
and regular.
For a QTranslator object, a lookup key is a triple (\e context, \e
{source text}, \e comment) that uniquely identifies a message. An
extended key is a quadruple (\e hash, \e context, \e {source
text}, \e comment), where \e hash is computed from the source text
and the comment. Unless you plan to read and write messages
yourself, you need not worry about the hash value.
QTranslatorMessage stores this triple or quadruple and the relevant
translation if there is any.
\sa QTranslator
*/
/*!
Constructs a translator message with the extended key (0, 0, 0, 0)
and QString::null as translation.
*/
QTranslatorMessage::QTranslatorMessage()
: h( 0 ), cx( 0 ), st( 0 ), cm( 0 )
{
}
/*!
Constructs an translator message with the extended key (\e h, \a
context, \a sourceText, \a comment), where \e h is computed from
\a sourceText and \a comment, and possibly with a \a translation.
*/
QTranslatorMessage::QTranslatorMessage( const char * context,
const char * sourceText,
const char * comment,
const QString& translation )
: cx( context ), st( sourceText ), cm( comment ), tn( translation )
{
// 0 means we don't know, "" means empty
if ( cx == (const char*)0 )
cx = "";
if ( st == (const char*)0 )
st = "";
if ( cm == (const char*)0 )
cm = "";
h = elfHash( st + cm );
}
/*!
Constructs a translator message read from the \a stream. The
resulting message may have any combination of content.
\sa QTranslator::save()
*/
QTranslatorMessage::QTranslatorMessage( QDataStream & stream )
: cx( 0 ), st( 0 ), cm( 0 )
{
QString str16;
char tag;
Q_UINT8 obs1;
for ( ;; ) {
tag = 0;
if ( !stream.atEnd() )
stream.readRawBytes( &tag, 1 );
switch( (Tag)tag ) {
case Tag_End:
if ( h == 0 )
h = elfHash( st + cm );
return;
case Tag_SourceText16: // obsolete
stream >> str16;
st = str16.latin1();
break;
case Tag_Translation:
stream >> tn;
break;
case Tag_Context16: // obsolete
stream >> str16;
cx = str16.latin1();
break;
case Tag_Hash:
stream >> h;
break;
case Tag_SourceText:
stream >> st;
break;
case Tag_Context:
stream >> cx;
if ( cx == "" ) // for compatibility
cx = 0;
break;
case Tag_Comment:
stream >> cm;
break;
case Tag_Obsolete1: // obsolete
stream >> obs1;
break;
default:
h = 0;
st = 0;
cx = 0;
cm = 0;
tn = QString::null;
return;
}
}
}
/*!
Constructs a copy of translator message \a m.
*/
QTranslatorMessage::QTranslatorMessage( const QTranslatorMessage & m )
: cx( m.cx ), st( m.st ), cm( m.cm ), tn( m.tn )
{
h = m.h;
}
/*!
Assigns message \a m to this translator message and returns a
reference to this translator message.
*/
QTranslatorMessage & QTranslatorMessage::operator=(
const QTranslatorMessage & m )
{
h = m.h;
cx = m.cx;
st = m.st;
cm = m.cm;
tn = m.tn;
return *this;
}
/*!
\fn uint QTranslatorMessage::hash() const
Returns the hash value used internally to represent the lookup
key. This value is zero only if this translator message was
constructed from a stream containing invalid data.
The hashing function is unspecified, but it will remain unchanged
in future versions of Qt.
*/
/*!
\fn const char *QTranslatorMessage::context() const
Returns the context for this message (e.g. "MyDialog").
\warning This may return 0 if the QTranslator object is stripped
(compressed).
*/
/*!
\fn const char *QTranslatorMessage::sourceText() const
Returns the source text of this message (e.g. "&Save").
\warning This may return 0 if the QTranslator object is stripped
(compressed).
*/
/*!
\fn const char *QTranslatorMessage::comment() const
Returns the comment for this message (e.g. "File|Save").
\warning This may return 0 if the QTranslator object is stripped
(compressed).
*/
/*!
\fn void QTranslatorMessage::setTranslation( const QString & translation )
Sets the translation of the source text to \a translation.
\sa translation()
*/
/*!
\fn QString QTranslatorMessage::translation() const
Returns the translation of the source text (e.g., "&Sauvegarder").
\sa setTranslation()
*/
/*!
\enum QTranslatorMessage::Prefix
Let (\e h, \e c, \e s, \e m) be the extended key. The possible
prefixes are
\value NoPrefix no prefix
\value Hash only (\e h)
\value HashContext only (\e h, \e c)
\value HashContextSourceText only (\e h, \e c, \e s)
\value HashContextSourceTextComment the whole extended key, (\e
h, \e c, \e s, \e m)
\sa write() commonPrefix()
*/
/*!
Writes this translator message to the \a stream. If \a strip is
FALSE (the default), all the information in the message is
written. If \a strip is TRUE, only the part of the extended key
specified by \a prefix is written with the translation (\c
HashContextSourceTextComment by default).
\sa commonPrefix()
*/
void QTranslatorMessage::write( QDataStream & stream, bool strip,
Prefix prefix ) const
{
char tag;
tag = (char)Tag_Translation;
stream.writeRawBytes( &tag, 1 );
stream << tn;
bool mustWriteHash = TRUE;
if ( !strip )
prefix = HashContextSourceTextComment;
switch ( prefix ) {
case HashContextSourceTextComment:
tag = (char)Tag_Comment;
stream.writeRawBytes( &tag, 1 );
stream << cm;
// fall through
case HashContextSourceText:
tag = (char)Tag_SourceText;
stream.writeRawBytes( &tag, 1 );
stream << st;
// fall through
case HashContext:
tag = (char)Tag_Context;
stream.writeRawBytes( &tag, 1 );
stream << cx;
// fall through
default:
if ( mustWriteHash ) {
tag = (char)Tag_Hash;
stream.writeRawBytes( &tag, 1 );
stream << h;
}
}
tag = (char)Tag_End;
stream.writeRawBytes( &tag, 1 );
}
/*!
Returns the widest lookup prefix that is common to this translator
message and to message \a m.
For example, if the extended key is for this message is (71,
"PrintDialog", "Yes", "Print?") and that for \a m is (71,
"PrintDialog", "No", "Print?"), this function returns \c
HashContext.
\sa write()
*/
QTranslatorMessage::Prefix QTranslatorMessage::commonPrefix(
const QTranslatorMessage& m ) const
{
if ( h != m.h )
return NoPrefix;
if ( cx != m.cx )
return Hash;
if ( st != m.st )
return HashContext;
if ( cm != m.cm )
return HashContextSourceText;
return HashContextSourceTextComment;
}
/*!
Returns TRUE if the extended key of this object is equal to that of
\a m; otherwise returns FALSE.
*/
bool QTranslatorMessage::operator==( const QTranslatorMessage& m ) const
{
return h == m.h && cx == m.cx && st == m.st && cm == m.cm;
}
/*!
\fn bool QTranslatorMessage::operator!=( const QTranslatorMessage& m ) const
Returns TRUE if the extended key of this object is different from
that of \a m; otherwise returns FALSE.
*/
/*!
Returns TRUE if the extended key of this object is
lexicographically before than that of \a m; otherwise returns
FALSE.
*/
bool QTranslatorMessage::operator<( const QTranslatorMessage& m ) const
{
return h != m.h ? h < m.h
: ( cx != m.cx ? cx < m.cx
: (st != m.st ? st < m.st : cm < m.cm) );
}
/*!
\fn bool QTranslatorMessage::operator<=( const QTranslatorMessage& m ) const
Returns TRUE if the extended key of this object is
lexicographically before that of \a m or if they are equal;
otherwise returns FALSE.
*/
/*!
\fn bool QTranslatorMessage::operator>( const QTranslatorMessage& m ) const
Returns TRUE if the extended key of this object is
lexicographically after that of \a m; otherwise returns FALSE.
*/
/*!
\fn bool QTranslatorMessage::operator>=( const QTranslatorMessage& m ) const
Returns TRUE if the extended key of this object is
lexicographically after that of \a m or if they are equal;
otherwise returns FALSE.
*/
#endif // QT_NO_TRANSLATION