Added include path resolution to external file access functions

* if a given file can not be located relative to the transformation's location both "read-file" and "read-xml-file" will now try to resolve the path using the IncludeEntityResolver
* all external functions based on the FunctionBase template are now provided with a pointer to a IncludeEntityResolver instance
* it is determined by the external function implementation whether include path resolution will be used

6 files changed, 35 insertions, 17 deletions

diff --git a/src/function/base.h b/src/function/base.h
index cc207c3..3609201 100644
--- a/src/function/base.h
+++ b/src/function/base.h
@@ -10,9 +10,10 @@
 
 #include "common.h"
 #include "support/xalan_string.h"
+#include "support/filesystem_context.h"
+#include "support/include_entity_resolver.h"
 #include "support/tuple/mapper.h"
 #include "support/dom/document_cache.h"
-#include "support/filesystem_context.h"
 
 namespace InputXSLT {
 
@@ -24,7 +25,8 @@ class FunctionBase : public xalan::Function {
 	public:
 		typedef std::tuple<Types...> parameter_tuple;
 
-		FunctionBase():
+		FunctionBase(IncludeEntityResolver* resolver):
+			include_resolver_(resolver),
 			document_cache_(std::make_shared<DomDocumentCache>()) { }
 
 		virtual xalan::XObjectPtr execute(
@@ -73,6 +75,9 @@ class FunctionBase : public xalan::Function {
 		FunctionBase& operator=(const FunctionBase&) = delete;
 		bool operator==(const FunctionBase&) const   = delete;
 
+	protected:
+		IncludeEntityResolver* const include_resolver_;
+
 	private:
 		std::shared_ptr<DomDocumentCache> document_cache_;
 
diff --git a/src/function/read_file.cc b/src/function/read_file.cc
index 5ded1ac..85f834d 100644
--- a/src/function/read_file.cc
+++ b/src/function/read_file.cc
@@ -28,10 +28,21 @@ xercesc::DOMDocument* FunctionReadFile::constructDocument(
 	const FilesystemContext& fsContext,
 	const FunctionBase::parameter_tuple& parameters
 ) {
-	const boost::filesystem::path filePath(
+	boost::filesystem::path filePath(
 		fsContext.resolve(std::get<0>(parameters))
 	);
 
+	if ( !(boost::filesystem::exists(filePath) &&
+	       boost::filesystem::is_regular_file(filePath)) ) {
+		auto resolvedPath = this->include_resolver_->resolve(
+			std::get<0>(parameters)
+		);
+
+		if ( resolvedPath.first ) {
+			filePath = resolvedPath.second;
+		}
+	}
+
 	xercesc::DOMDocument* const domDocument(
 		xercesc::DOMImplementation::getImplementation()->createDocument(
 			nullptr,
diff --git a/src/function/read_xml_file.cc b/src/function/read_xml_file.cc
index 5f1d47d..b9246e6 100644
--- a/src/function/read_xml_file.cc
+++ b/src/function/read_xml_file.cc
@@ -38,10 +38,21 @@ xercesc::DOMDocument* FunctionReadXmlFile::constructDocument(
 	const FilesystemContext& fsContext,
 	const FunctionBase::parameter_tuple& parameters
 ) {
-	const boost::filesystem::path filePath(
+	boost::filesystem::path filePath(
 		fsContext.resolve(std::get<0>(parameters))
 	);
 
+	if ( !(boost::filesystem::exists(filePath) &&
+	       boost::filesystem::is_regular_file(filePath)) ) {
+		auto resolvedPath = this->include_resolver_->resolve(
+			std::get<0>(parameters)
+		);
+
+		if ( resolvedPath.first ) {
+			filePath = resolvedPath.second;
+		}
+	}
+
 	xercesc::DOMDocument* const domDocument(
 		xercesc::DOMImplementation::getImplementation()->createDocument(
 			nullptr,
diff --git a/src/function/transform.cc b/src/function/transform.cc
index 8823745..cf6ff09 100644
--- a/src/function/transform.cc
+++ b/src/function/transform.cc
@@ -9,10 +9,6 @@
 
 namespace InputXSLT {
 
-FunctionTransform::FunctionTransform(IncludeEntityResolver* resolver):
-	FunctionBase::FunctionBase(),
-	include_resolver_(resolver) { }
-
 xercesc::DOMDocument* FunctionTransform::constructDocument(
 	const InputXSLT::FilesystemContext& fsContext,
 	const FunctionBase::parameter_tuple& parameters
diff --git a/src/function/transform.h b/src/function/transform.h
index 94fae53..810738e 100644
--- a/src/function/transform.h
+++ b/src/function/transform.h
@@ -3,8 +3,6 @@
 
 #include "base.h"
 
-#include "support/include_entity_resolver.h"
-
 namespace InputXSLT {
 
 class FunctionTransform : public FunctionBase<
@@ -14,7 +12,7 @@ class FunctionTransform : public FunctionBase<
 	xalan::XObjectPtr
 > {
 	public:
-		FunctionTransform(IncludeEntityResolver*);
+		using FunctionBase::FunctionBase;
 
 	protected:
 		friend FunctionBase;
@@ -24,9 +22,6 @@ class FunctionTransform : public FunctionBase<
 			const FunctionBase::parameter_tuple&
 		);
 
-	private:
-		IncludeEntityResolver* const include_resolver_;
-
 };
 
 }
diff --git a/src/plattform_guard.cc b/src/plattform_guard.cc
index 8ffbbb9..d66c8b5 100644
--- a/src/plattform_guard.cc
+++ b/src/plattform_guard.cc
@@ -25,19 +25,19 @@ PlattformGuard::PlattformGuard(const std::vector<std::string>& path):
 	xalan::XalanTransformer::installExternalFunctionGlobal(
 		customNamespace,
 		xalan::XalanDOMString("read-file"),
-		InputXSLT::FunctionReadFile()
+		InputXSLT::FunctionReadFile(&this->include_resolver_)
 	);
 
 	xalan::XalanTransformer::installExternalFunctionGlobal(
 		customNamespace,
 		xalan::XalanDOMString("read-xml-file"),
-		InputXSLT::FunctionReadXmlFile()
+		InputXSLT::FunctionReadXmlFile(&this->include_resolver_)
 	);
 
 	xalan::XalanTransformer::installExternalFunctionGlobal(
 		customNamespace,
 		xalan::XalanDOMString("read-directory"),
-		InputXSLT::FunctionReadDirectory()
+		InputXSLT::FunctionReadDirectory(&this->include_resolver_)
 	);
 
 	xalan::XalanTransformer::installExternalFunctionGlobal(