Writing extensions

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REQUEST EXIT

/** * xsltExtInitFunction: * @ctxt: an XSLT transformation context * @URI: the namespace URI for the extension * * A function called at initialization time of an XSLT * extension module * * Returns a pointer to the module specific data for this * transformation */ typedef void *(*xsltExtInitFunction)(xsltTransformContextPtr ctxt, const xmlChar *URI);

int xsltRegisterExtFunction(xsltTransformContextPtr ctxt, const xmlChar *name, const xmlChar *URI, xmlXPathEvalFunc function);

/** * xmlXPathEvalFunc: * @ctxt: an XPath parser context * @nargs: the number of arguments passed to the function * * an XPath evaluation function, the parameters are on the * XPath context stack */ typedef void (*xmlXPathEvalFunc)(xmlXPathParserContextPtr ctxt, int nargs);

/** * xsltExtFunctionTest: * @ctxt: the XPath Parser context * @nargs: the number of arguments * * function libxslt:test() for testing the extensions support. */ static void xsltExtFunctionTest(xmlXPathParserContextPtr ctxt, int nargs) { xsltTransformContextPtr tctxt; void *data; tctxt = xsltXPathGetTransformContext(ctxt); if (tctxt == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtFunctionTest: failed to get the transformation context\n"); return; } data = xsltGetExtData(tctxt, (const xmlChar *) XSLT_DEFAULT_URL); if (data == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtFunctionTest: failed to get module data\n"); return; } #ifdef WITH_XSLT_DEBUG_FUNCTION xsltGenericDebug(xsltGenericDebugContext, "libxslt:test() called with %d args\n", nargs); #endif }

int xsltRegisterExtElement(xsltTransformContextPtr ctxt, const xmlChar *name, const xmlChar *URI, xsltTransformFunction function);

/** * xsltTransformFunction: * @ctxt: the XSLT transformation context * @node: the input node * @inst: the stylesheet node * @comp: the compiled information from the stylesheet * * signature of the function associated to elements part of the * stylesheet language like xsl:if or xsl:apply-templates. */ typedef void (*xsltTransformFunction) (xsltTransformContextPtr ctxt, xmlNodePtr node, xmlNodePtr inst, xsltStylePreCompPtr comp);

/** * xsltExtElementTest: * @ctxt: an XSLT processing context * @node: The current node * @inst: the instruction in the stylesheet * @comp: precomputed information * * Process a libxslt:test node */ static void xsltExtElementTest(xsltTransformContextPtr ctxt, xmlNodePtr node, xmlNodePtr inst, xsltStylePreCompPtr comp) { xmlNodePtr comment; if (ctxt == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtElementTest: no transformation context\n"); return; } if (node == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtElementTest: no current node\n"); return; } if (inst == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtElementTest: no instruction\n"); return; } if (ctxt->insert == NULL) { xsltGenericError(xsltGenericErrorContext, "xsltExtElementTest: no insertion point\n"); return; } comment = xmlNewComment((const xmlChar *) "libxslt:test element test worked"); xmlAddChild(ctxt->insert, comment); }

/** * xsltExtShutdownFunction: * @ctxt: an XSLT transformation context * @URI: the namespace URI for the extension * @data: the data associated to this module * * A function called at shutdown time of an XSLT extension module */ typedef void (*xsltExtShutdownFunction) (xsltTransformContextPtr ctxt, const xmlChar *URI, void *data);

The XSLT C library for GNOME

Writing extensions

Table of content

Introduction

Basics

Extension modules

Registering a module

Loading a module

Registering an extension function

Implementing an extension function

Examples for extension functions

Registering an extension element

Implementing an extension element

Example for extension elements

The shutdown of a module

Future work