From a008efd24e81441a23ff3e81320ac3522251327e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= <peterix@gmail.com>
Date: Sat, 2 Jan 2016 00:35:54 +0100
Subject: GH-1365 rework java version parsing and sorting

---
 logic/java/JavaVersion.cpp | 112 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 logic/java/JavaVersion.cpp

(limited to 'logic/java/JavaVersion.cpp')

diff --git a/logic/java/JavaVersion.cpp b/logic/java/JavaVersion.cpp
new file mode 100644
index 00000000..84fc48a4
--- /dev/null
+++ b/logic/java/JavaVersion.cpp
@@ -0,0 +1,112 @@
+#include "JavaVersion.h"
+#include <MMCStrings.h>
+
+#include <QRegularExpression>
+#include <QString>
+
+JavaVersion & JavaVersion::operator=(const QString & javaVersionString)
+{
+	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(string);
+	parseable = match.hasMatch();
+	major = getCapturedInteger(match, "major");
+	minor = getCapturedInteger(match, "minor");
+	security = getCapturedInteger(match, "security");
+	prerelease = match.captured("prerelease");
+	return *this;
+}
+
+JavaVersion::JavaVersion(const QString &rhs)
+{
+	operator=(rhs);
+}
+
+QString JavaVersion::toString()
+{
+	return string;
+}
+
+bool JavaVersion::requiresPermGen()
+{
+	if(parseable)
+	{
+		return major < 8;
+	}
+	return true;
+}
+
+bool JavaVersion::operator<(const JavaVersion &rhs)
+{
+	if(parseable && rhs.parseable)
+	{
+		if(major < rhs.major)
+			return true;
+		if(major > rhs.major)
+			return false;
+		if(minor < rhs.minor)
+			return true;
+		if(minor > rhs.minor)
+			return false;
+		if(security < rhs.security)
+			return true;
+		if(security > rhs.security)
+			return false;
+
+		// everything else being equal, consider prerelease status
+		bool thisPre = !prerelease.isEmpty();
+		bool rhsPre = !rhs.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(prerelease, rhs.prerelease, Qt::CaseSensitive) < 0;
+		}
+		// neither is prerelease, so they are the same -> this cannot be less than rhs
+		return false;
+	}
+	else return Strings::naturalCompare(string, rhs.string, Qt::CaseSensitive) < 0;
+}
+
+bool JavaVersion::operator==(const JavaVersion &rhs)
+{
+	if(parseable && rhs.parseable)
+	{
+		return major == rhs.major && minor == rhs.minor && security == rhs.security && prerelease == rhs.prerelease;
+	}
+	return string == rhs.string;
+}
+
+bool JavaVersion::operator>(const JavaVersion &rhs)
+{
+	return (!operator<(rhs)) && (!operator==(rhs));
+}
-- 
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