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* using xalan::FormatterToXercesDOM internally
** this required changes to the TransformationFacade::generate member method overloads
* TransformationFacade::generate now accepts references to xalan::FormatterListener instances
** "generate(std::basic_ostream<char>&..." instantiates a xalan::FormatterToXML and passes it to the actual generate member method
* changed ResultNodeFacade's "getNode" method into a "getResultElement" method
** xalan::FormatterToXercesDOM requires a xercesc::DOMElement instance instead of the previously available xercesc::DOMNode instance
** changed FunctionReadDirectory accordingly
* adapted FunctionTransform test case accordingly
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* i.e. "write-file" now supports the serialization of given DOM structures
** this will be needed e.g. if FunctionTransform returns the result as a DOM tree instead of as a plain string
** enables the creation of multiple XML documents from within a single transformation
*** i.e. backports the functionality provided in XSLT 2.0 by "xsl:result-document" to xalan's XSLT 1.0
* changed test cases accordingly
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* previous logic for resolving boost::filesystem::path parameters in the XObjectValue class actively tried to resolve existing files
** this contradicts the planned introduction of e.g. a external "write-file" function
* callers of external functions with path arguments now have to enclose them in square brackets if include path resolution is required
** analog to the usage of the "xsl:import" tag
* moved "getPathFromSystemId" from compilation local method into static method of IncludeEntityResolver
* changed test cases accordingly
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* added support for defining boost::filesystem::path as a external function parameter
** boost::filesystem::path parameters are resolved against the appropriate FilesystemContext and IncludeEntityResolver instances
* xalan::XSLTInputSource parameter source paths are also resolved
* removed need for passing a reference FilesystemContext to "constructDocument" methods
** they now only accept the parameters of the external function implemented by them
** all path resolution logic is wrapped by the newly created XObjectValue class
* converted XObjectValue namespace into class
** the "get" template method is now a template member method
** this was needed to enable value casting logic to access the appropriate FilesystemContext and IncludeEntityResolver instances
* this commit marks the next step towards the goals defined in 741a70f
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* FunctionTransform was adapted to support passing the transformation as either a string path or directly as a node-set / result-tree
** this in turn required changes to the TransformationFacade
** the implementation of a xalan::XSLTInputSource specialization for the XObjectValue::get template method was also required
* changed ixslt executable to match TransformationFacade constructor changes
* these changes were implemented in preparation for a restructuring of how the separate external functions provided by InputXSLT operate and work together
** the approach up until now was to provide non-combinable external functions for distinct task such as "read a file" and "transform that transformation using these parameters into that file"
** if you think about the areas of operations of these functions are overlapping quite a bit
*** e.g. FunctionTransform reads files, transforms DOM structures and writes files instead of only transforming things
** the new approach will be to limit the feature set of each function in the attempt of making the clearer and increasing their combinability
*** e.g. FunctionTransform won't read or write files but expect both the input-DOM and the transformation-DOM as node-sets or result trees and return the transformed document as a node-set to be written using FunctionWriteFile (to be implemented)
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* if a square bracket enclosed path can be extracted but not resolved against the include path vector we should return at least the extracted path and not the raw path
* otherwise the system has no chance of correctly resolving things
** additionally error messages were showing the square bracket syntax instead of the actual path
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* extracted system id handling into separate "resolve" method overload of "IncludeEntityResolver" class
* paths to be resolved against the include path vector are enclosed by square brackets
** FilesystemContext for external functions was instantiated using the unmodified systemId provided by xalan::Locator
** this commit adds include path resolution to that step
*** exceptions were thrown as the program tried to instantiate a FilesystemContext instance without resolving the square bracket syntax
* changed FunctionTransform "target" attribute content to the target path filename instead of the full path
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* implemented for commit 5f6fc45 but not included into that commit
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* replaced std::tuple constructing Mapper template methods with direct XObjectArgVectorType unpacking
** XObjectValue::get template method is applied directly using parameter pack unpacking
* implemented custom IndexSequence / Sequence type to provide vector indexes
* modified all external functions to provide matching constructDocument overloads
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* in difference to ErrorCapacitor this class doesn't throw an exception on "discharge" but returns the gathered warnings
* adapted FunctionTransform and frontend error handling to include warnings
* added static "try_create" method to TransformationFacade
** wraps construction error handling
** custom logic may be embedded using the std::function argument
*** this was implemented to prevent unneccessary code duplication for handling both construction and generation errors
* adapted FunctionTransform to return warning as "warning" nodes in the result tree
** added functional lambda expression factory method "handleErrors"
*** returns a error handling lambda expression for a given ResultNodeFacade
* implemented WarningGuard class in frontend executable
** guarantees warnings to be printed to std::cerr independent of any exceptions
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* 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
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* added entity, line and column information
* formatting analog to ErrorCapacitor warning messages
** i.e. this commit implements functionality similar to "xalanc::ProblemListenerBase::defaultFormat" for "xercesc::ErrorHandler" exceptions
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* 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
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* xalan::ProblemListenerBase provides a static member method called "defaultFormat"
** this method provides formatting of problem messages into xalan::XalanDOMString instances when combined with xalan::DOMStringPrintWriter
* there is no need for implementing custom message formatting
** the only reason why ErrorCapacitor exists is so we are able to capture and print messages at our own volition
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* 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
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* xalan is segfaulting in XalanDOMString constructor when the static member "XalanLocator::getSystemId" is returning null-pointer
** this should seemingly be handled by passing a pointer to the static constant m_dummy but this sadly fails to prevent the segfault
** the patch provided by this commit fixes the problem for now but I cannot guarantee that this wont cause any side effects in a other context
* Adapted TransformationFacade to handle errors during transformation compilation
** errors generated during transformation compilation are returned through the generate member method
** throwing an exeception during TransformationFacade construction would require additional error handling in the calling code
* Added xalan::ProblemListener functionality to the ErrorHandler class
** XSLT problems passed to the ProblemListener are returned alongside to and treated as all other transformation errors
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* 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
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* std::string specialization of "get" template method
* replaces FunctionTransform local input trimming implemented in 5859cb6
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* 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
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* there are situations where one may pass absolute paths to external functions which should not be resolved against the context path
** for example when reading files found by "read-directory" through its "full" value node
* this could be checked by the external functions themself
** but as this check is required by all of them it is better implemented in the FilesystemContext
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* 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
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* replaced ranged for loop with more appropriate std::for_each
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* std::vector<FilesystemContext> instance is now const
** this required a constructor change
* marked resolve member method as const as it doesn't need to modify anything
** this is also true for the overloaded resolveEntity member method
** the base class xercesc::EntityResolver prevents us from marking it as such
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* InputXSLT is dependent on boost anyway, so there is no argument to be made to emulate boost::optional using std::pair
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* enables access to include path resolution from external functions
** this will be useful to enable reading files from the include path using the external read-file or read-xml-file functions
* moved file path extraction into a function local to the compilation unit
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* 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
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* 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
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* 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
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* 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
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* order of items in a directory was varying across platforms which hindered testability
* they are now temporarily copied into a std::vector instance and then sorted using std::sort
* updated "read_directory" test case reference file accordingly
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* using std::unordered_map for named cache lookups was a nice idea but is not useful when one keeps in mind that:
** we don't want cached external function responses in a situation where we are able to execute transformations inside transformations
** cached responses mean that we can not read a xml file, overwrite it using another transformation and then read it again
* the currently available InputXSLT frontend only processes a single transformation anyway, so increased memory requirements should not pose a problem
** if a future frontend should offer batch processing of transformation tasks, one could implement a cache reset method to free memory after a transformation has been processed
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* removes responsibility for clearing parameters from the generate member methods
* abstracts parameter escaping and setting and handles map conversion
* marked actual generate member method as private and added StylesheetParameterGuard reference argument
** "frontend" generate member methods instantiate a StylesheetParameterGuard instance and pass it to the actual generate method
** this enables central default parameter definition while offering the possibility for custom parameters
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* as the xerces document is not instantiated by DomDocumentCache::item and the class only exports a pointer to the converted xalan document, it makes no sense to expose the class to the outside in the first place
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* ... as a test of how well we are able to test DOM structures
* required change of constructDocument visibility
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* this change makes the underlying similarity between all currently implemented external functions obvious
* they more or less only differ in their document construction logic
** i.e. there is a possibility for a second layer of abstraction between the classes derived from xalan::Function and the actual functionality
* added boost::filesystem::path taking overload of the _iterate_ member method to FilesystemGuard
** this overload functions as the _master_ overload that is called by all other overloads which merely perform type conversion and path resolution
** this overload doesn't perform path resolution
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* all instantiations of a FilesystemContext are currently based on information provided by a xalan::Locator instance provided to the external function execute member method
* this change hides the stylesheet path extraction from the actual function implementation
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* DomDocumentCache::item class now is _finalized_ by default and doesn't perform document instantiation, just lifetime management
** xercesc::DOMDocument is instantiated inside the external function implementations and committed to the document cache for conversion to a xalan document
* added mutex with scoped lock to prevent concurrent write access to the std::unordered_map contained withing DomDocumentCache
* functionality of the _get_ member method was split into _get_ and _create_
** added typedef for std::pair specialization type "optional_item" that functions as the return value of _create_ and _get_
* "locator->getSystemId()" was leaking memory as xerces doesn't manage the lifetime of the returned heap-allocated char array
** analog to XMLCh* strings
** transformed XercesStringGuard into template class to be instantiated on either XMLCh or char
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* it was moved into functions local to the respective compilation unit to improve readability
** splits DOM tree construction logic from the actual purpose of the external function
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* throwing std::out_of_range exception from DomDocumentCache::get instead of returning nullptr in case of a problem
* moved xalanToString method back into FilesystemContext compilation unit as is only needed there
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* A call to _read-file_ now returns a _content_ and _status_ node
** this enables XSL transformations to easily react to io related errors
* fixed bug in path resolution
** boost::filesystem _canonical_ method is throwing and exception when the given path does not exist, this pulled down the whole stack
** replaced call to _canonical_ with call to _absolute_ which does not have this requirement
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* A global DomDocumentCache instance would require key prefixing
* switched internal data structure to std::unordered_map for average constant time access
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* the plan to return XML-nodes from each external function requires a better way to manage the lifetime of many xerces DOM document instances and their support class instances
** this is why DomDocumentCache and DomDocumentCache::item were implemented
** based on std::map so we can easily access the result of old function calls
* changed external read-directory function to return the children of the document node instead of the document node itself
** removes unnecessary cruft in function calls
** will make returning status codes alongside the function result more pleasing to the eye
* updated test transformation to reflect new features
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* xercesc requires XMLCh* strings to be hand-allocated and released using the XMLString class
* XercesStringGuard works as a scope-guard for XMLCh* string lifetime and greatly simplifies xerces DOM construction
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* they are marked appropriately by a _type_ attribute
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* Wrapped xerces DOM and support class instances in now DomDocumentGuard scope-guard class
* FunctionReadDirectory class contains interal std::stack instance to store DomDocumentGuard instances
** wrapped in std::shared_ptr as FunctionReadDirectory is internally cloned by xalan...
** this is needed as the DOM has to preserved longer than the external function execution scope
* Sadly XMLCh xerces strings have to be manually released
** added appropriate xercesc::XMLString::release calls
* xalan::XercesDOMWrapperParsedSource does not mirror a given xerces DOM but convert it on instantiation
** this is why there is a dedicated finalize member method in InputXSLT::DomDocumentGuard
* In short: I do not like the amount of trickery needed to simply prevent memory leaks in this context
** there sadly doesn't seem to be a substantially easier way to return arbitrary DOM trees from a external function
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* _read-directory_ lists all files in a given directory
** currently text-only output, xml planned
* improved FilesystemContext path resolution (relative path is fully resolved by boost::filesystem)
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* this class provides methods for resolving paths relative to the contained base path
* other filesystem interaction methods will also be implemented in this class
** for instance directory traversal
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