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#include "qmimeglobpattern_p.h"
#include <QRegExp>
#include <QStringList>
#include <QDebug>
/*!
\internal
\class QMimeGlobMatchResult
\brief The QMimeGlobMatchResult class accumulates results from glob matching.
Handles glob weights, and preferring longer matches over shorter matches.
*/
void QMimeGlobMatchResult::addMatch(const QString &mimeType, int weight, const QString &pattern)
{
// Is this a lower-weight pattern than the last match? Skip this match then.
if (weight < m_weight)
return;
bool replace = weight > m_weight;
if (!replace) {
// Compare the length of the match
if (pattern.length() < m_matchingPatternLength)
return; // too short, ignore
else if (pattern.length() > m_matchingPatternLength) {
// longer: clear any previous match (like *.bz2, when pattern is *.tar.bz2)
replace = true;
}
}
if (replace) {
m_matchingMimeTypes.clear();
// remember the new "longer" length
m_matchingPatternLength = pattern.length();
m_weight = weight;
}
m_matchingMimeTypes.append(mimeType);
if (pattern.startsWith(QLatin1String("*.")))
m_foundSuffix = pattern.mid(2);
}
/*!
\internal
\class QMimeGlobPattern
\brief The QMimeGlobPattern class contains the glob pattern for file names for MIME type matching.
\sa QMimeType, QMimeDatabase, QMimeMagicRuleMatcher, QMimeMagicRule
*/
bool QMimeGlobPattern::matchFileName(const QString& _filename) const
{
// "Applications MUST match globs case-insensitively, except when the case-sensitive
// attribute is set to true."
// The constructor takes care of putting case-insensitive patterns in lowercase.
const QString filename = m_caseSensitivity == Qt::CaseInsensitive ? _filename.toLower() : _filename;
const int pattern_len = m_pattern.length();
if (!pattern_len)
return false;
const int len = filename.length();
const int starCount = m_pattern.count(QLatin1Char('*'));
// Patterns like "*~", "*.extension"
if (m_pattern[0] == QLatin1Char('*') && m_pattern.indexOf(QLatin1Char('[')) == -1 && starCount == 1)
{
if (len + 1 < pattern_len) return false;
const QChar *c1 = m_pattern.unicode() + pattern_len - 1;
const QChar *c2 = filename.unicode() + len - 1;
int cnt = 1;
while (cnt < pattern_len && *c1-- == *c2--)
++cnt;
return cnt == pattern_len;
}
// Patterns like "README*" (well this is currently the only one like that...)
if (starCount == 1 && m_pattern.at(pattern_len - 1) == QLatin1Char('*')) {
if (len + 1 < pattern_len) return false;
if (m_pattern.at(0) == QLatin1Char('*'))
return filename.indexOf(m_pattern.mid(1, pattern_len - 2)) != -1;
const QChar *c1 = m_pattern.unicode();
const QChar *c2 = filename.unicode();
int cnt = 1;
while (cnt < pattern_len && *c1++ == *c2++)
++cnt;
return cnt == pattern_len;
}
// Names without any wildcards like "README"
if (m_pattern.indexOf(QLatin1Char('[')) == -1 && starCount == 0 && m_pattern.indexOf(QLatin1Char('?')))
return (m_pattern == filename);
// Other (quite rare) patterns, like "*.anim[1-9j]": use slow but correct method
const QRegExp rx(m_pattern, Qt::CaseSensitive, QRegExp::WildcardUnix);
return rx.exactMatch(filename);
}
static bool isFastPattern(const QString& pattern)
{
// starts with "*.", has no other '*' and no other '.'
return pattern.lastIndexOf(QLatin1Char('*')) == 0
&& pattern.lastIndexOf(QLatin1Char('.')) == 1
// and contains no other special character
&& !pattern.contains(QLatin1Char('?'))
&& !pattern.contains(QLatin1Char('['))
;
}
void QMimeAllGlobPatterns::addGlob(const QMimeGlobPattern& glob)
{
const QString &pattern = glob.pattern();
Q_ASSERT(!pattern.isEmpty());
//kDebug() << "pattern" << pattern << "glob.weight=" << glob.weight() << "isFast=" << isFastPattern(pattern) << glob.flags;
// Store each patterns into either m_fastPatternDict (*.txt, *.html etc. with default weight 50)
// or for the rest, like core.*, *.tar.bz2, *~, into highWeightPatternOffset (>50)
// or lowWeightPatternOffset (<=50)
if (glob.weight() == 50 && isFastPattern(pattern) && !glob.isCaseSensitive()) {
// The bulk of the patterns is *.foo with weight 50 --> those go into the fast patterns hash.
const QString extension = pattern.mid(2).toLower();
QStringList& patterns = m_fastPatterns[extension]; // find or create
// This would just slow things down: if (!patterns.contains(glob.mimeType()))
patterns.append(glob.mimeType());
} else {
if (glob.weight() > 50) {
// This would just slow things down: if (!m_highWeightGlobs.hasPattern(glob.mimeType(), glob.pattern()))
m_highWeightGlobs.append(glob);
} else {
//This would just slow things down: if (!m_lowWeightGlobs.hasPattern(glob.mimeType(), glob.pattern()))
m_lowWeightGlobs.append(glob);
}
}
}
void QMimeAllGlobPatterns::removeMimeType(const QString& mimeType)
{
QMutableHashIterator<QString, QStringList> it(m_fastPatterns);
while (it.hasNext()) {
it.next().value().removeAll(mimeType);
}
m_highWeightGlobs.removeMimeType(mimeType);
m_lowWeightGlobs.removeMimeType(mimeType);
}
void QMimeGlobPatternList::match(QMimeGlobMatchResult &result,
const QString &fileName) const
{
QMimeGlobPatternList::const_iterator it = this->constBegin();
const QMimeGlobPatternList::const_iterator endIt = this->constEnd();
for (; it != endIt; ++it) {
const QMimeGlobPattern &glob = *it;
if (glob.matchFileName(fileName))
result.addMatch(glob.mimeType(), glob.weight(), glob.pattern());
}
}
QStringList QMimeAllGlobPatterns::matchingGlobs(const QString &fileName, QString *foundSuffix) const
{
// First try the high weight matches (>50), if any.
QMimeGlobMatchResult result;
m_highWeightGlobs.match(result, fileName);
if (result.m_matchingMimeTypes.isEmpty()) {
// Now use the "fast patterns" dict, for simple *.foo patterns with weight 50
// (which is most of them, so this optimization is definitely worth it)
const int lastDot = fileName.lastIndexOf(QLatin1Char('.'));
if (lastDot != -1) { // if no '.', skip the extension lookup
const int ext_len = fileName.length() - lastDot - 1;
const QString simpleExtension = fileName.right(ext_len).toLower();
// (toLower because fast patterns are always case-insensitive and saved as lowercase)
const QStringList matchingMimeTypes = m_fastPatterns.value(simpleExtension);
foreach (const QString &mime, matchingMimeTypes) {
result.addMatch(mime, 50, QLatin1String("*.") + simpleExtension);
}
// Can't return yet; *.tar.bz2 has to win over *.bz2, so we need the low-weight mimetypes anyway,
// at least those with weight 50.
}
// Finally, try the low weight matches (<=50)
m_lowWeightGlobs.match(result, fileName);
}
if (foundSuffix)
*foundSuffix = result.m_foundSuffix;
return result.m_matchingMimeTypes;
}
void QMimeAllGlobPatterns::clear()
{
m_fastPatterns.clear();
m_highWeightGlobs.clear();
m_lowWeightGlobs.clear();
}
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