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2014-05-04Changed FilesystemContext constructor to accept xalan::Locator*Adrian Kummerländer
* 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
2014-05-03Revamped DomDocumentCache with regard to thread safetyAdrian Kummerländer
* 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
2014-05-02Changed external functions to enable global installationAdrian Kummerländer
* up until now all external functions were locally installed to a specific XalanTransformer instance contained within a TransformationGuard instance ** this had to change as I planned to add a "execute-transformation" function based on TransformationGuard which would have led to recursive self-instantiation ** global external functions have to be thread-safe * as global external function can not be provided with a reference to a transformation-specific FilesystemFacade instance, the working path is now determined using xalan::Locator ** currently using pointer arithmetics on XMLCh* to remove the "file://" prefix of the URI returned by locator->getSystemId(), may be unsafe * added compilation unit for PlattformGuard as it now contains function installation in addition to plattform lifetime management
2014-05-01Added basic parameter taking overload of TransformationFacade::generateAdrian Kummerländer
* XSLT stylesheets may be provided with a set of initial parameters ** these parameters can be provided as the second argument to the generate member method in the form of a string to string mapping ** the XSLT standard also permitts number and node set types as value arguments of such input parameters but this is not supported by this change * expanded test transformation to demonstrate this feature
2014-05-01Changed namespace for external functions to InputXSLTAdrian Kummerländer
* "InputXSLT" is defined as "function.inputxslt.application" * functions can now be accessed like "InputXSLT:read-file('../')" * updated test transformation accordingly * the XML standard does not require namespaces to be real, valid HTTP-URIs but treats them as plain strings
2014-04-30Moved file reading functionality into local functionsAdrian Kummerländer
* 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
2014-04-29Simplified external function result node setAdrian Kummerländer
* all functions return a single "error" node in the case that something went wrong * otherwise they return one or more "result" nodes that contain the function results and may be distinguished by one or more attributes * this makes handling the return values easier and more pleasing to the eye as not everything has to be prefixed by "self::*" * updated test transformation accordingly
2014-04-28Added basic README.mdAdrian Kummerländer
2014-04-28Adapted read-directory tree construction to match the other functionsAdrian Kummerländer
* 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
2014-04-27Added status information to external read-xml-file functionAdrian Kummerländer
* XML tree is contained below the _content_ node if read was successful ** status is set to error otherwise * updated test transformation accordingly
2014-04-26Added status information to external read-directory functionAdrian Kummerländer
* updated test transformation accordingly
2014-04-26Converted external read-file function output into a node setAdrian Kummerländer
* 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
2014-04-26Moved DomDocumentCache instances back into external function classAdrian Kummerländer
* A global DomDocumentCache instance would require key prefixing * switched internal data structure to std::unordered_map for average constant time access
2014-04-26Implemented global DOM document cacheAdrian Kummerländer
* 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
2014-04-25Improved argument resolution and error handlingAdrian Kummerländer
* execute member method internal argument count checks are not needed when using between one and two arguments ** xalan automatically generates the appropriate message containing the getError message when only offered fixed argument execute member overloads * improved FunctionReadDirectory attribute element generation * added additional validations to FunctionReadFile and FunctionReadXMLFile * I plan to return errors inside a DOM tree alongside the function return values in the future
2014-04-24Added XercesStringGuard scope-guard to manage XMLChAdrian Kummerländer
* 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
2014-04-24Expanded FunctionReadDirectory class to return files and directoriesAdrian Kummerländer
* they are marked appropriately by a _type_ attribute
2014-04-24Changed TransformerFacade into TransformationFacade for single XSLTsAdrian Kummerländer
* contains a single, compiled transformation as specified by its construction argument * uses the transformation's location as the FilesystemContext * allows generation of output documents using _generate_ member method
2014-04-23Fixed xerces DOM construction related memory leaksAdrian Kummerländer
* 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
2014-04-23Switched read-directory nodeSet generation to a xerces DOM documentAdrian Kummerländer
* replacement for manual XML construction * currently leaks memory as the objects have to exist out of scope and I have not yet thought of how to best manage their lifetime
2014-04-22Implemented basic XML output of external read-directory functionAdrian Kummerländer
* output is generated from XML hand-generated in a std::stringstream ** while this works reasonably well it is not how it should by done, i.e. this will have to be reimplemented using xerces / xalan constructs ** => this is intended to try out how a read-directory could work in a XSLT context
2014-04-21Implemented basic external directory traversal functionAdrian Kummerländer
* _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)
2014-04-21Extracted filesystem path resolution into InputXSLT::FilesystemContextAdrian Kummerländer
* 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
2014-04-20Switched filesystem interaction code to boost::filesystemAdrian Kummerländer
* while plain read access on files is doesn't require boost::filesystem it will greatly simplify the implementation of external directory traversal functions * it also improves the portability of relative path construction
2014-04-20Replaced c-style file reading with std::ifstreamAdrian Kummerländer
* there is no reason for performing system-calls instead of using the features offered by the standard library in this situation
2014-04-20Implemented support for modifying external function base pathAdrian Kummerländer
* one expects a read-file function to work relative to the directory the transformation is located and not to the executable's location ** from the perspective of the user the transformation is the application, not the actual executable * removed PlattformGuard struct from TransformerGuard (now TransformerFacade) * TransformerFacade is instatiated with the appropriate relative working path ** i.e. it will have to be instantiated for every directory containing one or more transformations
2014-04-19Implemented transformation execution functionAdrian Kummerländer
* InputXSLT::PlattformGuard handles xerces and xalan construction and lifetime * InputXSLT::TransformerGuard instantiates PlattformGuard, configurates external functions ** offers execute method for "executing" a XSL tranformation with empty input
2014-04-19Further code style fixesAdrian Kummerländer
* .. in the face of the planned development of usable external functions using the current proof-of-concept coding * replaced usage of std::shared_ptr in FunctionReadXmlFile class with explicit implementation of default and copy constructor * separated implementation and interfaces
2014-04-18Code style improvementsAdrian Kummerländer
* marked assignment and equality operators as deleted instead of making them private * XercesParserLiaison is stored in a std::shared_ptr specialization instance for scope guarding * moved implementation details into InputXSLT namespace
2014-04-18Implemented basic XML reading capabilitiesAdrian Kummerländer
* command "read-xml-file" reads a XML file and allows it to be transformed by the calling XSLT * this will allow workflows like the following: ** a tranformation reads all the markdown files in a directory ** these markdown files are converted to a xml representation by a external function calling a appropriate C++ markdown parser ** the XML representation of each markdown file is converted to XHTML inside the XSL transformation ** ... and embedded into the output XHTML document ** => all inside a single XSL tranformation *** i.e. it is provided with only a empty dummy XML input file and fetches the actual input by itself * as all current code contained within this repository this is just a quick and dirty proof-of-concept and not in any way good code
2014-04-18Added cmake build instructionsAdrian Kummerländer
* changed relative paths of input files to accomodate builds inside a separate directory
2014-04-18Removed xalan_using directives and added namespace aliasAdrian Kummerländer
* We don't want to pollute the main namespace with xalan classes while removing the version information inside the namespace
2014-04-17First commit of _InputXSLT_Adrian Kummerländer
* quick and dirty proof-of-concept for adding plain-file access to XSLT ** based on Apache Xalan XSLT processor * The idea is to create something like a static counterpart to Symphony CMS * Adding functions to XSLT for file system, plain file and binary file (read)-access * This project aims to test how such functionality can be integrated into XSLT ** if it works it could be developed into a nice static content transformation system * Contrary to the popular opinion I actually like XML and XSLT when used responsibly