Removed gtest based test cases and added program options

* selectively testing document construction in plain C++ code has turned out to be more work than worth it
** i.e. removed test cases and GTest dependency
* added boost::program_options based frontent to InputXSLT
** example command: "./test --transformation ../dummy/transform.xsl --target out.xml"
** the plan is to use a simple shell script that generated test transformations and compares the output to reference files

3 files changed, 9 insertions, 0 deletions

diff --git a/src/function/read_directory.h b/src/function/read_directory.h
index d34a80a..85e7f1b 100644
--- a/src/function/read_directory.h
+++ b/src/function/read_directory.h
@@ -9,6 +9,9 @@ class FunctionReadDirectory : public FunctionBase<FunctionReadDirectory> {
 	public:
 		using FunctionBase<FunctionReadDirectory>::FunctionBase;
 
+	protected:
+		friend FunctionBase;
+
 		xercesc::DOMDocument* constructDocument(
 			const FilesystemContext&,
 			const boost::filesystem::path&
diff --git a/src/function/read_file.h b/src/function/read_file.h
index b89263e..b581ee5 100644
--- a/src/function/read_file.h
+++ b/src/function/read_file.h
@@ -9,6 +9,9 @@ class FunctionReadFile : public FunctionBase<FunctionReadFile> {
 	public:
 		using FunctionBase<FunctionReadFile>::FunctionBase;
 
+	protected:
+		friend FunctionBase;
+
 		xercesc::DOMDocument* constructDocument(
 			const FilesystemContext&,
 			const boost::filesystem::path&
diff --git a/src/function/read_xml_file.h b/src/function/read_xml_file.h
index b1d165d..4aebe56 100644
--- a/src/function/read_xml_file.h
+++ b/src/function/read_xml_file.h
@@ -9,6 +9,9 @@ class FunctionReadXmlFile : public FunctionBase<FunctionReadXmlFile> {
 	public:
 		using FunctionBase<FunctionReadXmlFile>::FunctionBase;
 
+	protected:
+		friend FunctionBase;
+
 		xercesc::DOMDocument* constructDocument(
 			const FilesystemContext&,
 			const boost::filesystem::path&