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Diffstat (limited to 'bundle/libxml/xlink.c')
| -rw-r--r-- | bundle/libxml/xlink.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/bundle/libxml/xlink.c b/bundle/libxml/xlink.c new file mode 100644 index 0000000000..17ec77f66f --- /dev/null +++ b/bundle/libxml/xlink.c @@ -0,0 +1,179 @@ +/* + * xlink.c : implementation of the hyperlinks detection module + * This version supports both XML XLinks and HTML simple links + * + * See Copyright for the status of this software. + * + * daniel@veillard.com + */ + + +#define IN_LIBXML +#include "libxml.h" + +#include <string.h> /* for memset() only */ +#ifdef HAVE_CTYPE_H +#include <ctype.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_FCNTL_H +#include <fcntl.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#ifdef HAVE_ZLIB_H +#include <zlib.h> +#endif + +#include <libxml/xmlmemory.h> +#include <libxml/tree.h> +#include <libxml/parser.h> +#include <libxml/valid.h> +#include <libxml/xlink.h> +#include <libxml/globals.h> + +#define XLINK_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xlink/namespace/") +#define XHTML_NAMESPACE (BAD_CAST "http://www.w3.org/1999/xhtml/") + +/**************************************************************** + * * + * Default setting and related functions * + * * + ****************************************************************/ + +static xlinkHandlerPtr xlinkDefaultHandler = NULL; +static xlinkNodeDetectFunc xlinkDefaultDetect = NULL; + +/** + * xlinkGetDefaultHandler: + * + * Get the default xlink handler. + * + * Returns the current xlinkHandlerPtr value. + */ +xlinkHandlerPtr +xlinkGetDefaultHandler(void) { + return(xlinkDefaultHandler); +} + + +/** + * xlinkSetDefaultHandler: + * @handler: the new value for the xlink handler block + * + * Set the default xlink handlers + */ +void +xlinkSetDefaultHandler(xlinkHandlerPtr handler) { + xlinkDefaultHandler = handler; +} + +/** + * xlinkGetDefaultDetect: + * + * Get the default xlink detection routine + * + * Returns the current function or NULL; + */ +xlinkNodeDetectFunc +xlinkGetDefaultDetect (void) { + return(xlinkDefaultDetect); +} + +/** + * xlinkSetDefaultDetect: + * @func: pointer to the new detection routine. + * + * Set the default xlink detection routine + */ +void +xlinkSetDefaultDetect (xlinkNodeDetectFunc func) { + xlinkDefaultDetect = func; +} + +/**************************************************************** + * * + * The detection routines * + * * + ****************************************************************/ + + +/** + * xlinkIsLink: + * @doc: the document containing the node + * @node: the node pointer itself + * + * Check whether the given node carries the attributes needed + * to be a link element (or is one of the linking elements issued + * from the (X)HTML DtDs). + * This routine don't try to do full checking of the link validity + * but tries to detect and return the appropriate link type. + * + * Returns the xlinkType of the node (XLINK_TYPE_NONE if there is no + * link detected. + */ +xlinkType +xlinkIsLink (xmlDocPtr doc, xmlNodePtr node) { + xmlChar *type = NULL, *role = NULL; + xlinkType ret = XLINK_TYPE_NONE; + + if (node == NULL) return(XLINK_TYPE_NONE); + if (doc == NULL) doc = node->doc; + if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE)) { + /* + * This is an HTML document. + */ + } else if ((node->ns != NULL) && + (xmlStrEqual(node->ns->href, XHTML_NAMESPACE))) { + /* + * !!!! We really need an IS_XHTML_ELEMENT function from HTMLtree.h @@@ + */ + /* + * This is an XHTML element within an XML document + * Check whether it's one of the element able to carry links + * and in that case if it holds the attributes. + */ + } + + /* + * We don't prevent a-priori having XML Linking constructs on + * XHTML elements + */ + type = xmlGetNsProp(node, BAD_CAST"type", XLINK_NAMESPACE); + if (type != NULL) { + if (!xmlStrEqual(type, BAD_CAST "simple")) { + ret = XLINK_TYPE_SIMPLE; + } if (!xmlStrEqual(type, BAD_CAST "extended")) { + role = xmlGetNsProp(node, BAD_CAST "role", XLINK_NAMESPACE); + if (role != NULL) { + xmlNsPtr xlink; + xlink = xmlSearchNs(doc, node, XLINK_NAMESPACE); + if (xlink == NULL) { + /* Humm, fallback method */ + if (xmlStrEqual(role, BAD_CAST"xlink:external-linkset")) + ret = XLINK_TYPE_EXTENDED_SET; + } else { + xmlChar buf[200]; + snprintf((char *) buf, sizeof(buf), "%s:external-linkset", + (char *) xlink->prefix); + buf[sizeof(buf) - 1] = 0; + if (xmlStrEqual(role, buf)) + ret = XLINK_TYPE_EXTENDED_SET; + + } + + } + ret = XLINK_TYPE_EXTENDED; + } + } + + if (type != NULL) xmlFree(type); + if (role != NULL) xmlFree(role); + return(ret); +} |