Finaly got rid of the synchronizers, making Quassel quite a bit more lightweight...

[quassel.git] / src / common / util.cpp

diff --git a/src/common/util.cpp b/src/common/util.cpp
index 2238cbe..5cbfc86 100644 (file)
--- a/src/common/util.cpp
+++ b/src/common/util.cpp
@@ -19,6 +19,10 @@
  ***************************************************************************/
 
 #include "util.h"
+#include <QDebug>
+#include <QTextCodec>
+
+class QMetaMethod;
 
 QString nickFromMask(QString mask) {
   return mask.section('!', 0, 0);
@@ -40,6 +44,39 @@ bool isChannelName(QString str) {
   return QString("#&!+").contains(str[0]);
 }
 
+QString decodeString(QByteArray input, QString encoding) {
+  // First, we check if it's utf8. It is very improbable to encounter a string that looks like
+  // valid utf8, but in fact is not. This means that if the input string passes as valid utf8, it
+  // is safe to assume that it is.
+  Q_ASSERT(sizeof(const char) == sizeof(quint8));  // just to make sure
+  bool isUtf8 = true;
+  int cnt = 0;
+  for(int i = 0; i < input.size(); i++) {
+    if(cnt) {
+      // We check a part of a multibyte char. These need to be of the form 10yyyyyy.
+      if((input[i] & 0xc0) != 0x80) { isUtf8 = false; break; }
+      cnt--;
+      continue;
+    }
+    if((input[i] & 0x80) == 0x00) continue; // 7 bit is always ok
+    if((input[i] & 0xf8) == 0xf0) { cnt = 3; continue; }  // 4-byte char 11110xxx 10yyyyyy 10zzzzzz 10vvvvvv
+    if((input[i] & 0xf0) == 0xe0) { cnt = 2; continue; }  // 3-byte char 1110xxxx 10yyyyyy 10zzzzzz
+    if((input[i] & 0xe0) == 0xc0) { cnt = 1; continue; }  // 2-byte char 110xxxxx 10yyyyyy
+    isUtf8 = false; break;  // 8 bit char, but not utf8!
+  }
+  if(isUtf8 && cnt == 0) {
+    QString s = QString::fromUtf8(input);
+    //qDebug() << "Detected utf8:" << s;
+    return s;
+  }
+  QTextCodec *codec = QTextCodec::codecForName(encoding.toAscii());
+  if(!codec) {
+    qWarning() << QString("Invalid encoding: %1").arg(encoding);
+    return QString::fromAscii(input);
+  }
+  return codec->toUnicode(input);
+}
+
 void writeDataToDevice(QIODevice *dev, const QVariant &item) {
   QByteArray block;
   QDataStream out(&block, QIODevice::WriteOnly);
@@ -62,3 +99,44 @@ bool readDataFromDevice(QIODevice *dev, quint32 &blockSize, QVariant &item) {
   in >> item;
   return true;
 }
+
+
+uint editingDistance(const QString &s1, const QString &s2) {
+  uint n = s1.size()+1;
+  uint m = s2.size()+1;
+  //uint matrix[n][m];
+  QVector< QVector< uint > >matrix(n,QVector<uint>(m,0));
+
+  for(uint i = 0; i < n; i++)
+    matrix[i][0] = i;
+
+  for(uint i = 0; i < m; i++)
+    matrix[0][i] = i;
+
+  uint min;
+  for(uint i = 1; i < n; i++) {
+    for(uint j = 1; j < m; j++) {
+      uint deleteChar = matrix[i-1][j] + 1;
+      uint insertChar = matrix[i][j-1] + 1;
+
+      if(deleteChar < insertChar)
+       min = deleteChar;
+      else
+       min = insertChar;
+      
+      if(s1[i-1] == s2[j-1]) {
+       uint inheritChar = matrix[i-1][j-1];
+       if(inheritChar < min)
+         min = inheritChar;
+      }
+
+      matrix[i][j] = min;
+    }
+  }
+  return matrix[n-1][m-1];
+}
+
+QByteArray methodName(const QMetaMethod &method) {
+  QByteArray sig(method.signature());
+  return sig.left(sig.indexOf("("));
+}