Merged "read-xml-file" and "read-file" into "read-file"

* FunctionReadFile is now able to distinguish between XML files and plain text files
** it selects the appropriate course of action automatically
** reading the file as XML into the DOM or reading it as a string
* the current selection criteria is the file extension
** I am thinking about trying to import every file into the DOM and using the result state of that action as selection criteria
* Updated README.md and test cases accordingly

3 files changed, 49 insertions, 117 deletions

diff --git a/src/function/read_file.cc b/src/function/read_file.cc
index 22e96d7..7603ad1 100644
--- a/src/function/read_file.cc
+++ b/src/function/read_file.cc
@@ -3,6 +3,8 @@
 #include <xercesc/dom/DOMDocument.hpp>
 #include <xercesc/dom/DOMImplementation.hpp>
 #include <xercesc/dom/DOMElement.hpp>
+#include <xercesc/parsers/XercesDOMParser.hpp>
+#include <xercesc/framework/LocalFileInputSource.hpp>
 
 #include "boost/filesystem/fstream.hpp"
 
@@ -11,7 +13,28 @@
 
 namespace {
 
-inline std::string readFile(const boost::filesystem::path& filePath) {
+inline bool isXmlFile(const boost::filesystem::path& filePath) {
+	return filePath.extension() == ".xml";
+}
+
+inline xercesc::DOMNode* readXmlFile(
+	const boost::filesystem::path& filePath,
+	xercesc::DOMDocument* const domDocument
+) {
+	const xercesc::LocalFileInputSource file(
+		*InputXSLT::XercesStringGuard<XMLCh>(filePath.string().data())
+	);
+
+	xercesc::XercesDOMParser parser;
+	parser.parse(file);
+
+	return domDocument->importNode(
+		parser.getDocument()->getDocumentElement(),
+		true
+	);
+}
+
+inline std::string readPlainFile(const boost::filesystem::path& filePath) {
 	boost::filesystem::ifstream file(filePath);
 
 	return std::string(
@@ -53,11 +76,33 @@ xercesc::DOMDocument* FunctionReadFile::constructDocument(
 	result.setAttribute("path", filePath.string());
 
 	if ( boost::filesystem::is_regular_file(filePath) ) {
-		result.setAttribute("result", "success");
+		try {
+			if ( isXmlFile(filePath) ) {
+				result.setAttribute("type", "xml");
+
+				result.setContent(
+					readXmlFile(filePath.string(), domDocument)
+				);
+			} else {
+				result.setAttribute("type", "plain");
+
+				result.setContent(
+					readPlainFile(filePath)
+				);
+			}
+
+			result.setAttribute("result", "success");
+		}
+		catch ( const xercesc::DOMException& exception ) {
+			result.setAttribute("result", "error");
 
-		result.setContent(readFile(filePath));
+			result.setValueNode(
+				"error",
+				*XercesStringGuard<char>(exception.msg)
+			);
+		}
 	} else {
-		result.setAttribute("result", "success");
+		result.setAttribute("result", "error");
 	}
 
 	return domDocument;
diff --git a/src/function/read_xml_file.cc b/src/function/read_xml_file.cc
deleted file mode 100644
index e4d256d..0000000
--- a/src/function/read_xml_file.cc
+++ /dev/null
@@ -1,86 +0,0 @@
-#include "read_xml_file.h"
-
-#include <xercesc/dom/DOMDocument.hpp>
-#include <xercesc/dom/DOMImplementation.hpp>
-#include <xercesc/dom/DOMElement.hpp>
-#include <xercesc/parsers/XercesDOMParser.hpp>
-#include <xercesc/framework/LocalFileInputSource.hpp>
-
-#include "support/xerces_string_guard.h"
-#include "support/dom/result_node_facade.h"
-
-namespace {
-
-inline xercesc::DOMNode* importDocumentElement(
-	const std::string& filePath,
-	xercesc::DOMDocument* const domDocument
-) {
-	const xercesc::LocalFileInputSource file(
-		*InputXSLT::XercesStringGuard<XMLCh>(filePath.data())
-	);
-
-	xercesc::XercesDOMParser parser;
-	parser.parse(file);
-
-	return domDocument->importNode(
-		parser.getDocument()->getDocumentElement(),
-		true
-	);
-}
-
-}
-
-namespace InputXSLT {
-
-xercesc::DOMDocument* FunctionReadXmlFile::constructDocument(
-	const FilesystemContext& fsContext,
-	std::string rawPath
-) {
-	boost::filesystem::path filePath(fsContext.resolve(rawPath));
-
-	if ( !(boost::filesystem::exists(filePath) &&
-	       boost::filesystem::is_regular_file(filePath)) ) {
-		if ( auto resolvedPath = this->include_resolver_->resolve(rawPath) ) {
-			filePath = *resolvedPath;
-		}
-	}
-
-	xercesc::DOMDocument* const domDocument(
-		xercesc::DOMImplementation::getImplementation()->createDocument(
-			nullptr,
-			*XercesStringGuard<XMLCh>("content"),
-			nullptr
-		)
-	);
-
-	xercesc::DOMNode* const rootNode(
-		domDocument->getDocumentElement()
-	);
-
-	ResultNodeFacade result(domDocument, rootNode, "file");
-	result.setAttribute("path", filePath.string());
-
-	if ( boost::filesystem::is_regular_file(filePath) ) {
-		try {
-			result.setContent(
-				importDocumentElement(filePath.string(), domDocument)
-			);
-
-			result.setAttribute("result", "success");
-		}
-		catch ( const xercesc::DOMException& exception ) {
-			result.setAttribute("result", "error");
-
-			result.setValueNode(
-				"error",
-				*XercesStringGuard<char>(exception.msg)
-			);
-		}
-	} else {
-		result.setAttribute("result", "error");
-	}
-
-	return domDocument;
-}
-
-}
diff --git a/src/function/read_xml_file.h b/src/function/read_xml_file.h
deleted file mode 100644
index 7fe949a..0000000
--- a/src/function/read_xml_file.h
+++ /dev/null
@@ -1,27 +0,0 @@
-#ifndef INPUTXSLT_SRC_FUNCTION_READ_XML_FILE_H_
-#define INPUTXSLT_SRC_FUNCTION_READ_XML_FILE_H_
-
-#include "base.h"
-
-namespace InputXSLT {
-
-class FunctionReadXmlFile : public FunctionBase<
-	FunctionReadXmlFile,
-	std::string
-> {
-	public:
-		using FunctionBase::FunctionBase;
-
-	protected:
-		friend FunctionBase;
-
-		xercesc::DOMDocument* constructDocument(
-			const FilesystemContext&,
-			std::string
-		);
-
-};
-
-}
-
-#endif  // INPUTXSLT_SRC_FUNCTION_READ_XML_FILE_H_