cmStringAlgorithms: Add cmExpandList functions

Source/cmStringAlgorithms.h

@@ -68,6 +68,48 @@ std::string cmJoin(Range const& rng, cm::string_view separator)
 /** Extract tokens that are separated by any of the characters in @a sep.  */
 std::vector<std::string> cmTokenize(cm::string_view str, cm::string_view sep);
 
+/**
+ * Expand the ; separated string @a arg into multiple arguments.
+ * All found arguments are appended to @a argsOut.
+ */
+void cmExpandList(cm::string_view arg, std::vector<std::string>& argsOut,
+                  bool emptyArgs = false);
+
+/**
+ * Expand out any arguments in the string range [@a first, @a last) that have
+ * ; separated strings into multiple arguments.  All found arguments are
+ * appended to @a argsOut.
+ */
+template <class InputIt>
+void cmExpandLists(InputIt first, InputIt last,
+                   std::vector<std::string>& argsOut)
+{
+  for (; first != last; ++first) {
+    ExpandList(*first, argsOut);
+  }
+}
+
+/**
+ * Same as cmExpandList but a new vector is created containing
+ * the expanded arguments from the string @a arg.
+ */
+std::vector<std::string> cmExpandedList(cm::string_view arg,
+                                        bool emptyArgs = false);
+
+/**
+ * Same as cmExpandList but a new vector is created containing the expanded
+ * versions of all arguments in the string range [@a first, @a last).
+ */
+template <class InputIt>
+std::vector<std::string> cmExpandedLists(InputIt first, InputIt last)
+{
+  std::vector<std::string> argsOut;
+  for (; first != last; ++first) {
+    cmExpandList(*first, argsOut);
+  }
+  return argsOut;
+}
+
 /** Concatenate string pieces into a single string.  */
 std::string cmCatViews(std::initializer_list<cm::string_view> views);