first commit

lazyPathResolve/__init__.py

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+class RelPathInavlid(Exception):
+    """Raised when the relative path is invalid"""
+    pass
+
+def resolvePathUNIX(abs, rel):
+    newPath = ''
+    if rel[0:2] == './':
+        newPath = abs + rel[1:]
+    elif rel[0:3] == '../':
+        absSegs = abs.split("/")
+        relSegs = rel.split("/")
+        backLevels = sum(x == ".." for x in relSegs)
+        if backLevels >= len(absSegs):
+            raise RelPathInavlid
+        newPathArr = absSegs[1:(backLevels * -1)]
+        for relLevel in relSegs:
+            if relLevel != '..':
+                newPathArr.append(relLevel)
+        for lvl in newPathArr:
+            newPath = newPath + '/' + lvl
+    else:
+        raise RelPathInavlid
+
+    return newPath