From 023f285c3ac8ea71aa8d4662242b41fb82fb7896 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Abecasis?= <joao@abecasis.name>
Date: Wed, 22 Jul 2009 12:56:52 +0200
Subject: QDirIterator refactoring

Name filters and resulting regular expressions are stable, no need to
regenerate the latter on each iteration.

Reviewed-by: Olivier Goffart
---
 src/corelib/io/qdiriterator.cpp | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/corelib/io/qdiriterator.cpp b/src/corelib/io/qdiriterator.cpp
index f7df836..9dda4f6 100644
--- a/src/corelib/io/qdiriterator.cpp
+++ b/src/corelib/io/qdiriterator.cpp
@@ -119,6 +119,10 @@ public:
     const QDir::Filters filters;
     const QDirIterator::IteratorFlags iteratorFlags;
 
+#ifndef QT_NO_REGEXP
+    QVector<QRegExp> nameRegExps;
+#endif
+
     QStack<QAbstractFileEngineIterator *> fileEngineIterators;
     QFileInfo currentFileInfo;
     QFileInfo nextFileInfo;
@@ -140,6 +144,15 @@ QDirIteratorPrivate::QDirIteratorPrivate(const QString &path, const QStringList
       , filters(QDir::NoFilter == filters ? QDir::AllEntries : filters)
       , iteratorFlags(flags)
 {
+#ifndef QT_NO_REGEXP
+    nameRegExps.reserve(nameFilters.size());
+    for (int i = 0; i < nameFilters.size(); ++i)
+        nameRegExps.append(
+            QRegExp(nameFilters.at(i),
+                    (filters & QDir::CaseSensitive) ? Qt::CaseSensitive : Qt::CaseInsensitive,
+                    QRegExp::Wildcard));
+#endif
+
     // Populate fields for hasNext() and next()
     pushDirectory(QFileInfo(path));
     advance();
@@ -274,11 +287,11 @@ bool QDirIteratorPrivate::matchesFilters(const QString &fileName, const QFileInf
     // Pass all entries through name filters, except dirs if the AllDirs
     if (!nameFilters.isEmpty() && !((filters & QDir::AllDirs) && fi.isDir())) {
         bool matched = false;
-        for (int i = 0; i < nameFilters.size(); ++i) {
-            QRegExp regexp(nameFilters.at(i),
-                            (filters & QDir::CaseSensitive) ? Qt::CaseSensitive : Qt::CaseInsensitive,
-                            QRegExp::Wildcard);
-            if (regexp.exactMatch(fileName)) {
+        for (QVector<QRegExp>::const_iterator iter = nameRegExps.constBegin(),
+                                              end = nameRegExps.constEnd();
+                iter != end; ++iter) {
+
+            if (iter->exactMatch(fileName)) {
                 matched = true;
                 break;
             }
-- 
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