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i.e. the directory tree was not correctly created in all circumstances which led to both the `generate` and `write-file` test cases failing. This was combined with some accumulated changes such as the extraction of process context instantiation.
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* analogously to the projects required to actually use `InputXSLT`: Apache Xalan and Xerces
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* both the `Sequence` and `IndexSequence` helper templates were developed prior to C++14
* as the new standard covers exactly the functionality provided by these templates they should be replaced
** they are used as indexes to the _Xalan_ parameter array in `FunctionBase`
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* e.g. member functions defined in the class definition are implicitly marked `inline`
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* this is possibly a breaking change for all applications built on either `FunctionExternalCommand` or `FunctionReadFile`
** e.g. meta datasource XPath queries in _StaticXSLT_ will have to be changed to accomodate this
* the reason for doing this was to fix the behaviour when reading namespaced XML files
** e.g. XSL stylesheets could only be queried with a clunky XPath expression such as `$transformation/self::*[name() = 'xsl:stylesheet']` instead of simply `$transformation/self::xsl:stylesheet`
*** this was caused by the now activated namespace comprehension in `xercesc::XercesDOMParser` which is disabled by default
*** it caused all local node names to be converted into their namespace prefixed version, e.g. `local-name()` returned `xsl:stylesheet` instead of `stylesheet`
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* `FunctionExternalCommand` failed to offer correct output handling when provided with a valid XML document which included a XML declaration
** `xerces::XercesDOMParser` generated the appropriate errors but they were not handled by `FunctionExternalCommand`
** wrapping is not necessary for full XML documents but is required for invalid XML as returned by e.g. common _Markdown_ processors
*** if wrapping is applied to full XML documents which include a XML declaration the parser and subsequently the complete external function fails
* added error parser handling by making the compilation unit local `importDocumentElement` method return value optional
* added XML declaration detection and handling to `readOutput`
** if XML declaration is detected no wrapping is applied
* added wrapping detection in `FunctionExternalCommand::constructDocument`
** if no wrapping is detected the whole tree is returned as content instead of just returning its child nodes
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* long outputs to stdout from child processes filled up the `boost::process::pistream` buffer and caused `write` to block
** this issue was circumvented by reading the stream into a `std::stringstream` instance before retrieving the blocking exit status
* modified document import implementation accordingly
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* this is required to be able to resolve paths contained within a file relative to its location
** which is in turn needed to enable BuildXSLT modules without requiring the module transformations to be resolved using IncludeEntityResolver
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* this changes filesystem context resolution for external function execution to be relative to the working directory
** this was changed to enable module support in BuildXSLT
*** ... which is in turn required as a foundation for extracting the detail transformations into a separate "StaticXSLT" application
* added parameter-less FilesystemContext constructor which defaults to the working directory
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* i.e. it now supports reading transformations from either a file or stdin
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* updated dependencies to mention C++14
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* i.e. InputXSLT now requires a C++14 supporting compiler / standard library implementation
* this was done while enabling the StreamInputSource to handle all kinds of streams
** this in turn is required to enable e.g. stdin as transformation source while preserving the correct filesystem context
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* doctypeSystem and doctypePublic were mixed up
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* this change was needed so that one is able to apply transformations located in e.g. a central directory as if they where located in the working directory
** otherwise e.g. the BuildXSLT transformation would have to be copied into every project that requires it
* implemented StreamInputSource wrapper for boost::filesystem::ifstream and xalan::XSLTInputSource
** this is needed because the boost::filesystem::ifstream instance has to exist as long as the xalan::XSLTInputSource it is bound to
** i.e. a simple helper function to instantiate the source and set the working directory would have not been sufficient
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* otherwise include entity resolution fails for node-based xalan::XSLTInputSource instances instantiated by the XObjectValue class
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* if the target parameter is not provided FunctionGenerate now performs exactly the same functionality as FunctionTransform
* added "boost::optional<boost::filesystem::path>" specialization to the XObjectValue class
* modified test cases accordingly
* modified README.md accordingly
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* changed the XObjectValue constructor to accept a pointer to FilesystemContext instead of instantiating the context by itself
* the FilesystemContext is now instantiated in the "callConstructDocument" member method of "FunctionBase"
** a const reference to FilesystemContext is passed to all "constructDocument" member method implementations
* the FilesystemContext is currently only used by FunctionExternal command to set the correct work directory in "boost::process::context"
** this is required so calling external commands from inside a stylesheet works as expected
*** i.e. from inside the directory the stylesheet is located in
* modified all remaining external function implementations accordingly
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* this change was implemented to match the naming scheme of all other external functions
* updated external text formatter test case accordingly
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* the minimum count of parameters to a external function is the maximum parameter count minus all optional parameters
* updated error message of "FunctionBase" member method "getError" to reflect the newly implemented possibility of optional parameters
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* renamed FunctionExternalTextFormatter into FunctionExternalCommand
** the goal is to provide a general interface to a variety of external commands
*** e.g. not just text formatters but system utilities for file management and so on
** this requires the stdin parameter to be optional as not all external commands require stdin input
* implemented "filter_derived" helper template to determine amount of optional parameters
** optional parameters are defined as "boost::optional" specializations
*** they in turn can be detected by checking if "boost::optional_detail::optional_tag" is a base class
* "callConstructDocument" member method of "FunctionBase" performs additional bounds checking of parameter vector
* "boost::optional<std::string>" specific member overload was added to "XObjectValue" helper class
** we will have to provide full specializations for all optional types as C++ prohibits partial member function template specialization
* renamed the external function in "PlattformGuard"
* changed README.md and test cases accordingly
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* otherwise one has to pass the full path to the command
** additionally it is much easier to enable passing arguments to the external formatter this way
* modified external function parameter accordingly
* updated external text formatter test case
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* FilesystemContext was returning absolute paths in nearly every situation
** even when a path relative to the current working directory might be easier on the eyes
* new _soft_ base path resolution logic is implemented in a local "determineBasePath" method
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* i.e. they now create the directory tree required to contain their respective output files automatically
* this is needed so TestXSLT is able to create the target directory implicitly
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* entities in transformations passed by DOM to FunctionGenerate or FunctionTransform require a valid system id as a FilesystemContext base to be resolved
* added getBase member method to FilesystemContext
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* its called a "platform" and not a "plattform" as in German...
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* TestXSLT is a playground for testing static site generation concepts based on InputXSLT
* replaced xalan::FormatterToXML indent amount with its default value
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* the base path of entities resolved through square bracket include paths was not resolved correctly due to missing extraction
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* added custom deleter for xalan::XalanCompiledStylesheet specific std::unique_ptr specialization
* added previously missing check for successful stylesheet compilation
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* this function essentially provides the same functionality as FunctionTransform with the addition of directly committing the result to the filesystem
** this is needed if one wants to generate doctype-containing transformations from inside a transformation as "write-file" is not able to infer the doctype of a given xalan::XalanNode pointer
** this is a integral limitation of (at least) XSLT 1.0 as implemented in Apache Xalan
*** a document can of course only have a single document type
*** e.g. we can not include a doctype node in the result tree of FunctionTransform
* implemented test case for FunctionGenerate
* transformation "test.xsl" is shared between the FunctionTransform and FunctionGenerate test cases
* modified README.md accordingly
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* they don't modifiy the class state so there is no reason for them not being marked as const
** all calling methods are also const
** this enables us to remove the const_cast in FunctionBase
* modified external function implementations accordingly
* inlined handleError method in FunctionTransform as it is not needed in multiple places anymore
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* "xsl:output" was disregarded for xalan::FormatterToXML based output
** the setting contained within this tag have to be passed manually to the constructor...
** the xalan standard implementation includes special handling for this case
** sadly there was no alternative to adding special handling in InputXSLT as well, it is really quite ugly
* added "dispatchTransformer" template member method to TransformerFacade
** calls xalan::FormatterToXML augmentation logic if needed, compiles template
* this problem also exists for FunctionTransform output to xercesc DOM
** this patch doesn't aim to fix it in that case, it will have to be fixed separately
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* previous createDocument method used default name "content"
** this led to problems when using xalan::XalanNode as transformation input
** the parameter-less createDocument overload now creates a unnamed xercesc::DOMDocument
* changed external function implementations accordingly
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* paths that can not be resolved against the include-path vector were passed on as they were instead of first removing the "file://" prefix
* this caused all normal entity paths passed to "xsl:import" and "xsl:include" statements to be unresolvable
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* the common use case of ResultNodeFacade inside external function implementations is managing the result root node
** this root node can be fetched through the xercesc::DOMDocument instance
** the new alias overload automatically fetches the root node pointer and as such doesn't require a root node parameter
* changed external function implementations accordingly
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* pointers to xercesc::DOMDocument were manually released
** this is now solved using a custom deleter for the appropriate std::unqiue_ptr template specialization
* added matching factory method to DomDocumentCache
* updated external function implementations accordingly
** "constructDocument" is now expected to return a DomDocumentCache::document_ptr instance
* updated TransformerFacade accordingly
* this change was implemented to get rid of the manual memory management required by xalan / xerces
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* as FunctionTransform returns the result as a DOM tree there is no reason for including the separately tested FunctionWriteFile in this test case
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* FunctionTransform now accepts xalan::XalanNode base xalan::XSLTInputSource instances as input parameter
** such xalan::XSLTInputSource instances were already supported for the stylesheet parameter but not for the input parameter
** e.g. it is now possible to generate a DOM inside a transformation, pass the DOM into a embedded transformation as input, modifiy the output of that transformation, pass this modified DOM into another transformation and so on... you get the point
* this required a revamp of TransformationFacade
** it is now a transformation independent wrapper for xalan::XalanTransformer
*** as such is was renamed to TransformerFacade
** removed error catching template factory method "try_create" as it is not needed anymore
** "std::basic_ostream<char>&" taking "generate" member method overloads were removed
** the set of "generate" member overloads was reduced to two methods accepting xalan::XSLTInputSource and xalan::FormatterListener as parameters
* the core problem first documented in 299d0f6 was solved by transforming the input parameter into a xerces DOM and wrapping this DOM inside a xalan::XercesDOMWrapperParsedSource instance
* serialization of the transformation result for file / std::cout output is now performed directly by the ixslt frontend
* removed 'stylesheet parameter' parameter from FunctionTransform
** the functionality provided by this is easily replicated using the now possible DOM input parameter
** this was done to simplify the interface and reduce unnecessary feature duplication
* updated FunctionTransform test case accordingly
* added "generate" template function to ixslt frontend
** wraps TransformerFacade and manages ist input arguments
** handles serialization to stream
* this commit marks a important milestone towards the goals defined in 741a70f
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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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* neither the constructor nor the generate member methods need to be templatized
** only supported "output" argument is now a reference to a "std::basic_ostream<char>" instance
** the caller is responsible for e.g. writing the output to disk
* this was done to simplify the basic interface of InputXSLT
* removed "default_params" testcase along with default parameter generation
** this feature is neither used nor required
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* test cases should also provide examples of how the tested external functions may be integrated into transformations
** helper templates such as "formatter" or "transformer" are an important step into this direction
** especially functions other than plain read-only functions fit much better into a template context than a XPath context
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* this increases consistency accross all external functions
* enables usage of non-global formatter executables
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