CuraPackageManager handles packages and plugins

CURA-4644

cura/Utils/VersionTools.py

@@ -0,0 +1,43 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import re
+
+
+# Regex for checking if a string is a semantic version number
+_SEMANTIC_VERSION_REGEX = re.compile(r"^[0-9]+(.[0-9]+)+$")
+
+
+# Checks if the given version string is a valid semantic version number.
+def isSemanticVersion(version: str) -> bool:
+    return _SEMANTIC_VERSION_REGEX.match(version) is not None
+
+
+# Compares the two given semantic version strings and returns:
+#   -1 if version1  < version2
+#    0 if version1 == version2
+#   +1 if version1  > version2
+# Note that this function only works with semantic versions such as "a.b.c..."
+def compareSemanticVersions(version1: str, version2: str) -> int:
+    # Validate the version numbers first
+    for version in (version1, version2):
+        if not isSemanticVersion(version):
+            raise ValueError("Invalid Package version '%s'" % version)
+
+    # Split the version strings into lists of integers
+    version1_parts = [int(p) for p in version1.split(".")]
+    version2_parts = [int(p) for p in version2.split(".")]
+    max_part_length = max(len(version1_parts), len(version2_parts))
+
+    # Make sure that two versions have the same number of parts. For missing parts, just append 0s.
+    for parts in (version1_parts, version2_parts):
+        for _ in range(max_part_length - len(parts)):
+            parts.append(0)
+
+    # Compare the version parts and return the result
+    result = 0
+    for idx in range(max_part_length):
+        result = version1_parts[idx] - version2_parts[idx]
+        if result != 0:
+            break
+    return result