+/**
+ * Convert generic options to data types that are specific to InputFormat.
+ *
+ * @param[in] user_spec Vector of tokenized words, string format.
+ * @param[in] fmt_opts Input format's options, result of InputFormat::options().
+ *
+ * @return Map of options suitable for InputFormat::create_input().
+ */
+map<string, Glib::VariantBase>
+Session::input_format_options(vector<string> user_spec,
+ map<string, shared_ptr<Option>> fmt_opts)
+{
+ map<string, Glib::VariantBase> result;
+
+ for (auto& entry : user_spec) {
+ /*
+ * Split key=value specs. Accept entries without separator
+ * (for simplified boolean specifications).
+ */
+ string key, val;
+ size_t pos = entry.find("=");
+ if (pos == std::string::npos) {
+ key = entry;
+ val = "";
+ } else {
+ key = entry.substr(0, pos);
+ val = entry.substr(pos + 1);
+ }
+
+ /*
+ * Skip user specifications that are not a member of the
+ * format's set of supported options. Have the text input
+ * spec converted to the required input format specific
+ * data type.
+ */
+ auto found = fmt_opts.find(key);
+ if (found == fmt_opts.end())
+ continue;
+ shared_ptr<Option> opt = found->second;
+ result[key] = opt->parse_string(val);
+ }
+
+ return result;
+}
+