sax2.c

xml开源解析代码.版本为libxml2-2.6.29,可支持GB3212.网络消息发送XML时很有用.

			fulln = xmlStrdup(attr->name);
		    }

		    /*
		     * Check that the attribute is not declared in the
		     * serialization
		     */
		    att = NULL;
		    if (atts != NULL) {
			i = 0;
			att = atts[i];
			while (att != NULL) {
			    if (xmlStrEqual(att, fulln))
				break;
			    i += 2;
			    att = atts[i];
			}
		    }
		    if (att == NULL) {
		        xmlErrValid(ctxt, XML_DTD_STANDALONE_DEFAULTED,
      "standalone: attribute %s on %s defaulted from external subset\n",
				    (const char *)fulln,
				    (const char *)attr->elem);
		    }
		}
		attr = attr->nexth;
	    }
	}

	/*
	 * Actually insert defaulted values when needed
	 */
	attr = elemDecl->attributes;
	while (attr != NULL) {
	    /*
	     * Make sure that attributes redefinition occuring in the
	     * internal subset are not overriden by definitions in the
	     * external subset.
	     */
	    if (attr->defaultValue != NULL) {
		/*
		 * the element should be instantiated in the tree if:
		 *  - this is a namespace prefix
		 *  - the user required for completion in the tree
		 *    like XSLT
		 *  - there isn't already an attribute definition 
		 *    in the internal subset overriding it.
		 */
		if (((attr->prefix != NULL) &&
		     (xmlStrEqual(attr->prefix, BAD_CAST "xmlns"))) ||
		    ((attr->prefix == NULL) &&
		     (xmlStrEqual(attr->name, BAD_CAST "xmlns"))) ||
		    (ctxt->loadsubset & XML_COMPLETE_ATTRS)) {
		    xmlAttributePtr tst;

		    tst = xmlGetDtdQAttrDesc(ctxt->myDoc->intSubset,
					     attr->elem, attr->name,
					     attr->prefix);
		    if ((tst == attr) || (tst == NULL)) {
		        xmlChar fn[50];
			xmlChar *fulln;

                        fulln = xmlBuildQName(attr->name, attr->prefix, fn, 50);
			if (fulln == NULL) {
			    xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElement");
			    return;
			}

			/*
			 * Check that the attribute is not declared in the
			 * serialization
			 */
			att = NULL;
			if (atts != NULL) {
			    i = 0;
			    att = atts[i];
			    while (att != NULL) {
				if (xmlStrEqual(att, fulln))
				    break;
				i += 2;
				att = atts[i];
			    }
			}
			if (att == NULL) {
			    xmlSAX2AttributeInternal(ctxt, fulln,
						 attr->defaultValue, prefix);
			}
			if ((fulln != fn) && (fulln != attr->name))
			    xmlFree(fulln);
		    }
		}
	    }
	    attr = attr->nexth;
	}
	if (internal == 1) {
	    elemDecl = xmlGetDtdQElementDesc(ctxt->myDoc->extSubset,
		                             name, prefix);
	    internal = 0;
	    goto process_external_subset;
	}
    }
}

/**
 * xmlSAX2StartElement:
 * @ctx: the user data (XML parser context)
 * @fullname:  The element name, including namespace prefix
 * @atts:  An array of name/value attributes pairs, NULL terminated
 *
 * called when an opening tag has been processed.
 */
void
xmlSAX2StartElement(void *ctx, const xmlChar *fullname, const xmlChar **atts)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlNodePtr ret;
    xmlNodePtr parent;
    xmlNsPtr ns;
    xmlChar *name;
    xmlChar *prefix;
    const xmlChar *att;
    const xmlChar *value;
    int i;

    if ((ctx == NULL) || (fullname == NULL) || (ctxt->myDoc == NULL)) return;
    parent = ctxt->node;
#ifdef DEBUG_SAX
    xmlGenericError(xmlGenericErrorContext,
	    "SAX.xmlSAX2StartElement(%s)\n", fullname);
#endif

    /*
     * First check on validity:
     */
    if (ctxt->validate && (ctxt->myDoc->extSubset == NULL) && 
        ((ctxt->myDoc->intSubset == NULL) ||
	 ((ctxt->myDoc->intSubset->notations == NULL) && 
	  (ctxt->myDoc->intSubset->elements == NULL) &&
	  (ctxt->myDoc->intSubset->attributes == NULL) && 
	  (ctxt->myDoc->intSubset->entities == NULL)))) {
	xmlErrValid(ctxt, XML_ERR_NO_DTD,
	  "Validation failed: no DTD found !", NULL, NULL);
	ctxt->validate = 0;
    }
       

    /*
     * Split the full name into a namespace prefix and the tag name
     */
    name = xmlSplitQName(ctxt, fullname, &prefix);


    /*
     * Note : the namespace resolution is deferred until the end of the
     *        attributes parsing, since local namespace can be defined as
     *        an attribute at this level.
     */
    ret = xmlNewDocNodeEatName(ctxt->myDoc, NULL, name, NULL);
    if (ret == NULL) {
        if (prefix != NULL)
	    xmlFree(prefix);
	xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElement");
        return;
    }
    if (ctxt->myDoc->children == NULL) {
#ifdef DEBUG_SAX_TREE
	xmlGenericError(xmlGenericErrorContext, "Setting %s as root\n", name);
#endif
        xmlAddChild((xmlNodePtr) ctxt->myDoc, (xmlNodePtr) ret);
    } else if (parent == NULL) {
        parent = ctxt->myDoc->children;
    }
    ctxt->nodemem = -1;
    if (ctxt->linenumbers) {
	if (ctxt->input != NULL) {
	    if (ctxt->input->line < 65535)
		ret->line = (short) ctxt->input->line;
	    else
	        ret->line = 65535;
	}
    }

    /*
     * We are parsing a new node.
     */
#ifdef DEBUG_SAX_TREE
    xmlGenericError(xmlGenericErrorContext, "pushing(%s)\n", name);
#endif
    nodePush(ctxt, ret);

    /*
     * Link the child element
     */
    if (parent != NULL) {
        if (parent->type == XML_ELEMENT_NODE) {
#ifdef DEBUG_SAX_TREE
	    xmlGenericError(xmlGenericErrorContext,
		    "adding child %s to %s\n", name, parent->name);
#endif
	    xmlAddChild(parent, ret);
	} else {
#ifdef DEBUG_SAX_TREE
	    xmlGenericError(xmlGenericErrorContext,
		    "adding sibling %s to ", name);
	    xmlDebugDumpOneNode(stderr, parent, 0);
#endif
	    xmlAddSibling(parent, ret);
	}
    }

    /*
     * Insert all the defaulted attributes from the DTD especially namespaces
     */
    if ((!ctxt->html) &&
	((ctxt->myDoc->intSubset != NULL) ||
	 (ctxt->myDoc->extSubset != NULL))) {
	xmlCheckDefaultedAttributes(ctxt, name, prefix, atts);
    }

    /*
     * process all the attributes whose name start with "xmlns"
     */
    if (atts != NULL) {
        i = 0;
	att = atts[i++];
	value = atts[i++];
	if (!ctxt->html) {
	    while ((att != NULL) && (value != NULL)) {
		if ((att[0] == 'x') && (att[1] == 'm') && (att[2] == 'l') &&
		    (att[3] == 'n') && (att[4] == 's'))
		    xmlSAX2AttributeInternal(ctxt, att, value, prefix);

		att = atts[i++];
		value = atts[i++];
	    }
	}
    }

    /*
     * Search the namespace, note that since the attributes have been
     * processed, the local namespaces are available.
     */
    ns = xmlSearchNs(ctxt->myDoc, ret, prefix);
    if ((ns == NULL) && (parent != NULL))
	ns = xmlSearchNs(ctxt->myDoc, parent, prefix);
    if ((prefix != NULL) && (ns == NULL)) {
	ns = xmlNewNs(ret, NULL, prefix);
	xmlNsWarnMsg(ctxt, XML_NS_ERR_UNDEFINED_NAMESPACE,
		     "Namespace prefix %s is not defined\n",
		     prefix, NULL);
    }

    /*
     * set the namespace node, making sure that if the default namspace
     * is unbound on a parent we simply kee it NULL
     */
    if ((ns != NULL) && (ns->href != NULL) &&
	((ns->href[0] != 0) || (ns->prefix != NULL)))
	xmlSetNs(ret, ns);

    /*
     * process all the other attributes
     */
    if (atts != NULL) {
        i = 0;
	att = atts[i++];
	value = atts[i++];
	if (ctxt->html) {
	    while (att != NULL) {
		xmlSAX2AttributeInternal(ctxt, att, value, NULL);
		att = atts[i++];
		value = atts[i++];
	    }
	} else {
	    while ((att != NULL) && (value != NULL)) {
		if ((att[0] != 'x') || (att[1] != 'm') || (att[2] != 'l') ||
		    (att[3] != 'n') || (att[4] != 's'))
		    xmlSAX2AttributeInternal(ctxt, att, value, NULL);

		/*
		 * Next ones
		 */
		att = atts[i++];
		value = atts[i++];
	    }
	}
    }

#ifdef LIBXML_VALID_ENABLED
    /*
     * If it's the Document root, finish the DTD validation and
     * check the document root element for validity
     */
    if ((ctxt->validate) && (ctxt->vctxt.finishDtd == XML_CTXT_FINISH_DTD_0)) {
	int chk;

	chk = xmlValidateDtdFinal(&ctxt->vctxt, ctxt->myDoc);
	if (chk <= 0)
	    ctxt->valid = 0;
	if (chk < 0)
	    ctxt->wellFormed = 0;
	ctxt->valid &= xmlValidateRoot(&ctxt->vctxt, ctxt->myDoc);
	ctxt->vctxt.finishDtd = XML_CTXT_FINISH_DTD_1;
    }
#endif /* LIBXML_VALID_ENABLED */

    if (prefix != NULL)
	xmlFree(prefix);

}

/**
 * xmlSAX2EndElement:
 * @ctx: the user data (XML parser context)
 * @name:  The element name
 *
 * called when the end of an element has been detected.
 */
void
xmlSAX2EndElement(void *ctx, const xmlChar *name ATTRIBUTE_UNUSED)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlParserNodeInfo node_info;
    xmlNodePtr cur;

    if (ctx == NULL) return;
    cur = ctxt->node;
#ifdef DEBUG_SAX
    if (name == NULL)
        xmlGenericError(xmlGenericErrorContext, "SAX.xmlSAX2EndElement(NULL)\n");
    else
	xmlGenericError(xmlGenericErrorContext, "SAX.xmlSAX2EndElement(%s)\n", name);
#endif
    
    /* Capture end position and add node */
    if (cur != NULL && ctxt->record_info) {
      node_info.end_pos = ctxt->input->cur - ctxt->input->base;
      node_info.end_line = ctxt->input->line;
      node_info.node = cur;
      xmlParserAddNodeInfo(ctxt, &node_info);
    }
    ctxt->nodemem = -1;

#ifdef LIBXML_VALID_ENABLED
    if (ctxt->validate && ctxt->wellFormed &&
        ctxt->myDoc && ctxt->myDoc->intSubset)
        ctxt->valid &= xmlValidateOneElement(&ctxt->vctxt, ctxt->myDoc,
					     cur);
#endif /* LIBXML_VALID_ENABLED */

    
    /*
     * end of parsing of this node.
     */
#ifdef DEBUG_SAX_TREE
    xmlGenericError(xmlGenericErrorContext, "popping(%s)\n", cur->name);
#endif
    nodePop(ctxt);
}
#endif /* LIBXML_SAX1_ENABLED || LIBXML_HTML_ENABLE */

/*
 * xmlSAX2TextNode:
 * @ctxt:  the parser context
 * @str:  the input string
 * @len: the string length
 * 
 * Remove the entities from an attribute value
 *
 * Returns the newly allocated string or NULL if not needed or error
 */
static xmlNodePtr
xmlSAX2TextNode(xmlParserCtxtPtr ctxt, const xmlChar *str, int len) {
    xmlNodePtr ret;
    const xmlChar *intern = NULL;

    /*
     * Allocate
     */
    if (ctxt->freeElems != NULL) {
	ret = ctxt->freeElems;
	ctxt->freeElems = ret->next;
	ctxt->freeElemsNr--;
    } else {
	ret = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
    }
    if (ret == NULL) {
        xmlErrMemory(ctxt, "xmlSAX2Characters");
	return(NULL);
    }
    memset(ret, 0, sizeof(xmlNode));
    /*
     * intern the formatting blanks found between tags, or the
     * very short strings
     */
    if (ctxt->dictNames) {
        xmlChar cur = str[len];

	if ((len < (int) (2 * sizeof(void *))) &&
	    (ctxt->options & XML_PARSE_COMPACT)) {
	    /* store the string in the node overrithing properties and nsDef */
	    xmlChar *tmp = (xmlChar *) &(ret->properties);
	    memcpy(tmp, str, len);
	    tmp[len] = 0;
	    intern = tmp;
	} else if ((len <= 3) && ((cur == '"') || (cur == '\'') ||
	    ((cur == '<') && (str[len + 1] != '!')))) {
	    intern = xmlDictLookup(ctxt->dict, str, len);
	} else if (IS_BLANK_CH(*str) && (len < 60) && (cur == '<') &&
	           (str[len + 1] != '!')) {
	    int i;

	    for (i = 1;i < len;i++) {
		if (!IS_BLANK_CH(str[i])) goto skip;
	    }
	    intern = xmlDictLookup(ctxt->dict, str, len);
	}
    }
skip:
    ret->type = XML_TEXT_NODE;

    ret->name = xmlStringText;
    if (intern == NULL) {
	ret->content = xmlStrndup(str, len);
	if (ret->content == NULL) {
	    xmlSAX2ErrMemory(ctxt, "xmlSAX2TextNode");
	    xmlFree(ret);
	    return(NULL);
	}
    } else
	ret->content = (xmlChar *) intern;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
	xmlRegisterNodeDefaultValue(ret);
    return(ret);
}

#ifdef LIBXML_VALID_ENABLED
/*
 * xmlSAX2DecodeAttrEntities:
 * @ctxt:  the parser context
 * @str:  the input string
 * @len: the string length
 * 
 * Remove the entities from an attribute value
 *
 * Returns the newly allocated string or NULL if not needed or error
 */
static xmlChar *
xmlSAX2DecodeAttrEntities(xmlParserCtxtPtr ctxt, const xmlChar *str,
                          const xmlChar *end) {
    const xmlChar *in;
    xmlChar *ret;

    in = str;
    while (in < end)
        if (*in++ == '&')
	    goto decode;
    return(NULL);
decode:
    ctxt->depth++;
    ret = xmlStringLenDecodeEntities(ctxt, str, end - str,
				     XML_SUBSTITUTE_REF, 0,0,0);
    ctxt->depth--;
    return(ret);
}
#endif /* LIBXML_VALID_ENABLED */

/**