qtranslator.cpp

奇趣公司比较新的qt/emd版本

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#include "qplatformdefs.h"

#include "qtranslator.h"

#ifndef QT_NO_TRANSLATION

#include "qfileinfo.h"
#include "qstring.h"
#include "qcoreapplication.h"
#include "qcoreapplication_p.h"
#include "qdatastream.h"
#include "qfile.h"
#include "qmap.h"
#include "qalgorithms.h"
#include "qhash.h"
#include "qtranslator_p.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/mman.h>
#include <errno.h>
#endif

#include <stdlib.h>

#include "qobject_p.h"

enum Tag { Tag_End = 1, Tag_SourceText16, Tag_Translation, Tag_Context16, Tag_Obsolete1,
           Tag_SourceText, Tag_Context, Tag_Comment, Tag_Obsolete2 };
/*
$ 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 uchar* found, const char* target, uint len)
{
    // 0 means anything, "" means empty
    return !found || qstrncmp((const char *)found, target, len) == 0 && target[len] == '\0';
}

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;
}

static int numerus(int n, const uchar *rules, int rulesSize)
{
#define CHECK_RANGE \
    do { \
        if (i >= rulesSize) \
            return -1; \
    } while (0)

    int result = 0;
    int i = 0;

    if (rulesSize == 0)
        return 0;

    for (;;) {
        bool orExprTruthValue = false;

        for (;;) {
            bool andExprTruthValue = true;

            for (;;) {
                bool truthValue = true;

                CHECK_RANGE;
                int opcode = rules[i++];

                int leftOperand = n;
                if (opcode & MOD_10) {
                    leftOperand %= 10;
                } else if (opcode & MOD_100) {
                    leftOperand %= 100;
                }

                int op = opcode & OP_MASK;

                CHECK_RANGE;
                int rightOperand = rules[i++];

                switch (op) {
                default:
                    return -1;
                case EQ:
                    truthValue = (leftOperand == rightOperand);
                    break;
                case LT:
                    truthValue = (leftOperand < rightOperand);
                    break;
                case LEQ:
                    truthValue = (leftOperand <= rightOperand);
                    break;
		case BETWEEN:
                    int bottom = rightOperand;
                    CHECK_RANGE;
                    int top = rules[i++];
                    truthValue = (leftOperand >= bottom && leftOperand <= top);
                }

                if (opcode & NOT)
                    truthValue = !truthValue;

                andExprTruthValue = andExprTruthValue && truthValue;

                if (i == rulesSize || rules[i] != AND)
                    break;
                ++i;
            }

            orExprTruthValue = orExprTruthValue || andExprTruthValue;

            if (i == rulesSize || rules[i] != OR)
                break;
            ++i;
        }

        if (orExprTruthValue)
            return result;

        ++result;

        if (i == rulesSize)
            return result;

        if (rules[i++] != NEWRULE)
            break;
    }
    return -1;
}

extern bool qt_detectRTLLanguage();

class QTranslatorPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QTranslator)
public:
    enum { Contexts = 0x2f, Hashes = 0x42, Messages = 0x69, NumerusRules = 0x88 };

    QTranslatorPrivate()
        : used_mmap(0), unmapPointer(0), unmapLength(0), messageArray(0), offsetArray(0),
          contextArray(0), numerusRulesArray(0), messageLength(0), offsetLength(0),
          contextLength(0), numerusRulesLength(0) {}

    // for mmap'ed files, this is what needs to be unmapped.
    uint used_mmap : 1;
    char *unmapPointer;
    unsigned int unmapLength;

    // for squeezed but non-file data, this is what needs to be deleted
    const uchar *messageArray;
    const uchar *offsetArray;
    const uchar *contextArray;
    const uchar *numerusRulesArray;
    uint messageLength;
    uint offsetLength;
    uint contextLength;
    uint numerusRulesLength;

    bool do_load(const uchar *data, int len);
    QString do_translate(const char *context, const char *sourceText, const char *comment,
                         int n) const;
    void clear();
};

/*!
    \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 translations from a
    source language to a target language. QTranslator provides
    functions to look up translations in a translation file.
    Translation files are created using \l{Qt Linguist}.

    The most common use of QTranslator is to: load a translation
    file, install it using QApplication::installTranslator(), and use
    it via QObject::tr(). Here's the \c main() function from the
    \l{linguist/hellotr}{Hello tr()} example:

    \quotefromfile linguist/hellotr/main.cpp
    \skipto main(
    \printuntil }

    Note that the translator must be created \e before the
    application's widgets.

    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.

    It is possible to lookup a translation using translate() (as tr()
    and QApplication::translate() do). The translate() function takes
    up to three parameters:

    \list
    \o The \e context - usually the class name for the tr() caller.
    \o The \e {source text} - usually the argument to tr().
    \o The \e comment - an optional comment that helps disambiguate
       different uses of the same text in the same context.
    \endlist

    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.

    \sa QApplication::installTranslator(), QApplication::removeTranslator(),
        QObject::tr(), QApplication::translate(), {I18N Example},
	{Hello tr() Example}, {Arrow Pad Example}, {Troll Print Example}
*/

/*!
    Constructs an empty message file object with parent \a parent that
    is not connected to any file.
*/

QTranslator::QTranslator(QObject * parent)
    : QObject(*new QTranslatorPrivate, parent)
{
}

#ifdef QT3_SUPPORT
/*!
    \overload
    \obsolete
 */
QTranslator::QTranslator(QObject * parent, const char * name)
    : QObject(*new QTranslatorPrivate, parent)
{
    setObjectName(QString::fromAscii(name));
}
#endif

/*!
    Destroys the object and frees any allocated resources.
*/

QTranslator::~QTranslator()
{
    if (QCoreApplication::instance())
        QCoreApplication::instance()->removeTranslator(this);
    Q_D(QTranslator);
    d->clear();
}

/*!
    Loads \a filename + \a suffix (".qm" if the \a suffix is
    not specified), which may be an absolute file name or relative
    to \a directory. Returns true if the translation is successfully
    loaded; otherwise returns false.

    The previous contents of this translator object are discarded.

    If the file name does not exist, other file names are tried
    in the following order:

    \list 1
    \o File name without \a suffix appended.
    \o File name with text after a character in \a search_delimiters
       stripped ("_." is the default for \a search_delimiters if it is
       an empty string) and \a suffix.
    \o File name stripped without \a suffix appended.
    \o 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
    \o \c /opt/foolib/foo.fr_ca.qm
    \o \c /opt/foolib/foo.fr_ca
    \o \c /opt/foolib/foo.fr.qm
    \o \c /opt/foolib/foo.fr
    \o \c /opt/foolib/foo.qm
    \o \c /opt/foolib/foo
    \endlist
*/

bool QTranslator::load(const QString & filename, const QString & directory,
                       const QString & search_delimiters,
                       const QString & suffix)
{
    Q_D(QTranslator);
    d->clear();

    QString prefix;
    if (QFileInfo(filename).isRelative()) { 
        prefix = directory;
	if (prefix.length() && !prefix.endsWith(QLatin1Char('/')))
	    prefix += QLatin1Char('/');
    }

    QString fname = filename;
    QString realname;
    QString delims;
    delims = search_delimiters.isNull() ? QString::fromLatin1("_.") : search_delimiters;

    for (;;) {
        QFileInfo fi;

        realname = prefix + fname + (suffix.isNull() ? QString::fromLatin1(".qm") : suffix);
        fi.setFile(realname);
        if (fi.isReadable())
            break;

        realname = prefix + fname;
        fi.setFile(realname);
        if (fi.isReadable())
            break;

        int rightmost = 0;
        for (int i = 0; i < (int)delims.length(); i++) {