1 files changed, 121 insertions, 0 deletions
diff --git a/launcher/java/JavaVersion.cpp b/launcher/java/JavaVersion.cpp
new file mode 100644
index 00000000..179ccd8d
--- /dev/null
+++ b/launcher/java/JavaVersion.cpp
@@ -0,0 +1,121 @@
+#include "JavaVersion.h"
+#include <MMCStrings.h>
+
+#include <QRegularExpression>
+#include <QString>
+
+JavaVersion & JavaVersion::operator=(const QString & javaVersionString)
+{
+    m_string = javaVersionString;
+
+    auto getCapturedInteger = [](const QRegularExpressionMatch & match, const QString &what) -> int
+    {
+        auto str = match.captured(what);
+        if(str.isEmpty())
+        {
+            return 0;
+        }
+        return str.toInt();
+    };
+
+    QRegularExpression pattern;
+    if(javaVersionString.startsWith("1."))
+    {
+        pattern = QRegularExpression ("1[.](?<major>[0-9]+)([.](?<minor>[0-9]+))?(_(?<security>[0-9]+)?)?(-(?<prerelease>[a-zA-Z0-9]+))?");
+    }
+    else
+    {
+        pattern = QRegularExpression("(?<major>[0-9]+)([.](?<minor>[0-9]+))?([.](?<security>[0-9]+))?(-(?<prerelease>[a-zA-Z0-9]+))?");
+    }
+
+    auto match = pattern.match(m_string);
+    m_parseable = match.hasMatch();
+    m_major = getCapturedInteger(match, "major");
+    m_minor = getCapturedInteger(match, "minor");
+    m_security = getCapturedInteger(match, "security");
+    m_prerelease = match.captured("prerelease");
+    return *this;
+}
+
+JavaVersion::JavaVersion(const QString &rhs)
+{
+    operator=(rhs);
+}
+
+QString JavaVersion::toString()
+{
+    return m_string;
+}
+
+bool JavaVersion::requiresPermGen()
+{
+    if(m_parseable)
+    {
+        return m_major < 8;
+    }
+    return true;
+}
+
+bool JavaVersion::operator<(const JavaVersion &rhs)
+{
+    if(m_parseable && rhs.m_parseable)
+    {
+        auto major = m_major;
+        auto rmajor = rhs.m_major;
+
+        // HACK: discourage using java 9
+        if(major > 8)
+            major = -major;
+        if(rmajor > 8)
+            rmajor = -rmajor;
+
+        if(major < rmajor)
+            return true;
+        if(major > rmajor)
+            return false;
+        if(m_minor < rhs.m_minor)
+            return true;
+        if(m_minor > rhs.m_minor)
+            return false;
+        if(m_security < rhs.m_security)
+            return true;
+        if(m_security > rhs.m_security)
+            return false;
+
+        // everything else being equal, consider prerelease status
+        bool thisPre = !m_prerelease.isEmpty();
+        bool rhsPre = !rhs.m_prerelease.isEmpty();
+        if(thisPre && !rhsPre)
+        {
+            // this is a prerelease and the other one isn't -> lesser
+            return true;
+        }
+        else if(!thisPre && rhsPre)
+        {
+            // this isn't a prerelease and the other one is -> greater
+            return false;
+        }
+        else if(thisPre && rhsPre)
+        {
+            // both are prereleases - use natural compare...
+            return Strings::naturalCompare(m_prerelease, rhs.m_prerelease, Qt::CaseSensitive) < 0;
+        }
+        // neither is prerelease, so they are the same -> this cannot be less than rhs
+        return false;
+    }
+    else return Strings::naturalCompare(m_string, rhs.m_string, Qt::CaseSensitive) < 0;
+}
+
+bool JavaVersion::operator==(const JavaVersion &rhs)
+{
+    if(m_parseable && rhs.m_parseable)
+    {
+        return m_major == rhs.m_major && m_minor == rhs.m_minor && m_security == rhs.m_security && m_prerelease == rhs.m_prerelease;
+    }
+    return m_string == rhs.m_string;
+}
+
+bool JavaVersion::operator>(const JavaVersion &rhs)
+{
+    return (!operator<(rhs)) && (!operator==(rhs));
+}