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* accepts a path parameter and the content to be written
* removed target parameter form FunctionTransform
** transformation result is now returned as a string
*** nodeset return value is planned
** e.g. writing the result to the fs is optional and has to be achieved using FunctionWriteFile
* changed "transform" test case accordingly
* this marks a paradigm shift and is the continuation of the changes described in 741a70f
** InputXSLT now also implements a output function
* added basic io error handling to FunctionReadFile
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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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* 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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* 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
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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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* names matter, from now on parameters to external functions will be called parameters uniformly instead of mixing arguments and parameters
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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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* 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
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* "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
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