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2014-06-05Implemented ErrorMultiplexer as primary error handlerAdrian Kummerländer
* ErrorMultiplexer is derived from both xercesc::ErrorHandler and xalan::ProblemListener * registers itself as XalanTransformer's ErrorHandler and ProblemListener * distributes captured errors and warnings to all registered ErrorMultiplexer::Receiver instances ** ErrorCapacitor implements the ErrorMultiplexer::Receiver interface and as such registers itself in a given ErrorMultiplexer instance ** ErrorMultiplexer reduces the different xalan and xercesc internal error classifications into either warnings or errors * this was implemented to make it possible to easily differentiate between warnings and errors ** previously warnings were treated as errors ** ErrorCapacitor ignores warnings and only captures errors ** WarningCapacitor will be implemented to handle warnings during XSLT processing
2014-05-31Revamped external function result treesAdrian Kummerländer
* the root node of the result tree of each function is a domain element ** i.e. the root node of "read-xml-file" is "file", the root node of "read-directory" is "directory" * the root node contains the result state of the function call encoded in a "result" attribute ** possible values are "success" and "error" ** the root node may contain additional attributes such as the target path of a called transformation * the actual function result is contained within the child nodes of the function root node ** i.e. the XML file tree returned by "read-xml-file" is a child of the function root node ** if specific errors occured they are also returned as child nodes of the function root node *** this is currently only the case for "transform" where transformation errors are returned as "error" value node childs of the function root node * updated test cases accordingly
2014-05-30Rewrote error handling based on exceptionsAdrian Kummerländer
* ErrorHandler is replaced by ErrorCapacitor ** temporarily registers itself as both the ProblemListener and ErrorHandler of a given XalanTransformer instance ** deregisters itself on destruction ** collects all problems and errors during its lifetime inside a internal std::vector<std::string> instance ** if this instance is not empty it is thrown contained within a ErrorCapacitor::exception by the member method ErrorCapacitor::discharge * this enables using the same code for handling transformation compilation and generation errors and problems * updated test frontend accordingly
2014-05-29Improved TransformationFacade error handlingAdrian Kummerländer
* ErrorHandler class created in 5859cb6 now caches all errors instead of pushing them to std::cerr ** cached errors are retrieved by TransformationFacade's "generate" member method * test frontend pushes all errors to std::cerr * FunctionTransform returns errors to the calling template as XML ** FunctionTransform test case demonstrates how one may test for successful transformation * "generate" member method returns std::string vector wrapped in a std::unique_ptr ** this is used as a kind of optional pointer, as the std::unique_ptr instance only wraps a vector if errors where actually generated
2014-05-28Moved input trimming into XObjectValue namespaceAdrian Kummerländer
* std::string specialization of "get" template method * replaces FunctionTransform local input trimming implemented in 5859cb6
2014-05-28Implemented basic ErrorHandlerAdrian Kummerländer
* InputXSLT::ErrorHandler is derived from xercesc::ErrorHandler and enables contextual printing of transformation errors ** currently this means that the error messages passed to std::cerr contain the full path of the offending transformation * added input trimming to the external transform function ** calls to this function from inside a transformation may contain unnecessary whitespace characters which disrupt further processing
2014-05-24Implemented ResultNodeFacade as a DOM node construction helperAdrian Kummerländer
* wraps result node construction and appends it to root node on destruction * offers a simpler interface for common node construction patterns * simplifies result node construction in all external function implementations ** most noticeable in FunctionReadDirectory * expanded FunctionReadDirectory result nodes by name, extension, and full-path nodes
2014-05-22Added include path resolution to external file access functionsAdrian Kummerländer
* 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
2014-05-20Replaced FunctionResolveInclude with IncludeEntityResolverAdrian Kummerländer
* xalan / xerces offers the possibility of implementing custom entity resolvers which are called upon by "<xsl:include..." ** such a custom resolver was implemented to resolve include path entities * this is a much better way to support include paths than offering a custom external "resolve-include" function * as entity paths are expanded before they are passed to the entity resolver, a special "[path]" syntax simmilar to "#include <path>" had to be implemented
2014-05-17Equalized parameter/argument naming pattern accross all external functionsAdrian Kummerländer
* names matter, from now on parameters to external functions will be called parameters uniformly instead of mixing arguments and parameters
2014-05-16Added XObjectPtr parameter to FunctionTransformAdrian Kummerländer
* the given XObject is passed to the called transformation ** this was done to enable templates to pass information to each other ** this should support any type usable in a XPath context to be passed as an argument * expanded FunctionTransform test case accordingly
2014-05-15Adapted FunctionBase template to accept multiple argument typesAdrian Kummerländer
* FunctionBase::argument_tuple is a std::tuple specialization type specialized on the argument types passed inside the variadic template argument of FunctionBase * added tuple Mapper and XObjectValue helper namespaces containing recursive tuple construction and XObjectPtr value extraction logic * changed all external function implementations accordingly * this change was implemented to uniformly support different external function argument types than std::string
2014-05-14Moved responsibility for argument conversion to FunctionBase descendantsAdrian Kummerländer
* external functions may expect arguments with a type different from boost::filesystem::path so they are only provided raw string values * moved xalan string conversion logic into separate compilation unit
2014-05-14Added ArgumentCount parameter to FunctionBase templateAdrian Kummerländer
* constructDocument member method is provided with a FunctionBase::argument_array instance * improved argument validation in FunctionBase * this parameter was added to support FunctionBase as a base class for FunctionTransform
2014-05-12Implemented basic external transform functionAdrian Kummerländer
* "InputXSLT:transform" expects two input arguments and executes the given transformation into the given target file ** this function respresents a important step in the direction of making it possible to write an actual static site generator on top of InputXSLT using XSLT * added basic "transform" test case * updated README.md to include this new function