Support partial versions

lib/modding/CModVersion.cpp

@@ -20,9 +20,9 @@ CModVersion CModVersion::GameVersion()
 
 CModVersion CModVersion::fromString(std::string from)
 {
-	int major = 0;
-	int minor = 0;
-	int patch = 0;
+	int major = Any;
+	int minor = Any;
+	int patch = Any;
 	try
 	{
 		auto pointPos = from.find('.');
@@ -45,11 +45,29 @@ CModVersion CModVersion::fromString(std::string from)
 
 std::string CModVersion::toString() const
 {
-	return std::to_string(major) + '.' + std::to_string(minor) + '.' + std::to_string(patch);
+	std::string res;
+	if(major != Any)
+	{
+		res += std::to_string(major);
+		if(minor != Any)
+		{
+			res += '.' + std::to_string(minor);
+			if(patch != Any)
+				res += '.' + std::to_string(patch);
+		}
+	}
+	return res;
 }
 
 bool CModVersion::compatible(const CModVersion & other, bool checkMinor, bool checkPatch) const
 {
+	if(minor == Any || other.minor == Any)
+		checkMinor = false;
+	if(patch == Any || other.patch == Any)
+		checkPatch = false;
+	
+	assert(checkMinor || !checkPatch);
+		
 	return  (major == other.major &&
 			(!checkMinor || minor >= other.minor) &&
 			(!checkPatch || minor > other.minor || (minor == other.minor && patch >= other.patch)));
@@ -57,11 +75,12 @@ bool CModVersion::compatible(const CModVersion & other, bool checkMinor, bool ch
 
 bool CModVersion::isNull() const
 {
-	return major == 0 && minor == 0 && patch == 0;
+	return major == Any;
 }
 
 bool operator < (const CModVersion & lesser, const CModVersion & greater)
 {
+	//specific is "greater" than non-specific, that's why do not check for Any value
 	if(lesser.major == greater.major)
 	{
 		if(lesser.minor == greater.minor)

lib/modding/CModVersion.h

@@ -20,9 +20,11 @@ VCMI_LIB_NAMESPACE_BEGIN
 
 struct DLL_LINKAGE CModVersion
 {
-	int major = 0;
-	int minor = 0;
-	int patch = 0;
+	static const int Any = -1;
+	
+	int major = Any;
+	int minor = Any;
+	int patch = Any;
 
 	CModVersion() = default;
 	CModVersion(int mj, int mi, int p): major(mj), minor(mi), patch(p) {}