xmlsave.c

libxml,在UNIX/LINUX下非常重要的一个库,为XML相关应用提供方便.目前上载的是最新版本,若要取得最新版本,请参考里面的readme.

 ************************************************************************/

#ifdef LIBXML_HTML_ENABLED
static void
xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur);
#endif
static void xmlNodeListDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur);
static void xmlNodeDumpOutputInternal(xmlSaveCtxtPtr ctxt, xmlNodePtr cur);
void xmlNsListDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur);
static void xmlDocContentDumpOutput(xmlSaveCtxtPtr ctxt, xmlDocPtr cur);

/**
 * xmlNsDumpOutput:
 * @buf:  the XML buffer output
 * @cur:  a namespace
 *
 * Dump a local Namespace definition.
 * Should be called in the context of attributes dumps.
 */
static void
xmlNsDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur) {
    if ((cur == NULL) || (buf == NULL)) return;
    if ((cur->type == XML_LOCAL_NAMESPACE) && (cur->href != NULL)) {
	if (xmlStrEqual(cur->prefix, BAD_CAST "xml"))
	    return;

        /* Within the context of an element attributes */
	if (cur->prefix != NULL) {
	    xmlOutputBufferWrite(buf, 7, " xmlns:");
	    xmlOutputBufferWriteString(buf, (const char *)cur->prefix);
	} else
	    xmlOutputBufferWrite(buf, 6, " xmlns");
	xmlOutputBufferWrite(buf, 1, "=");
	xmlBufferWriteQuotedString(buf->buffer, cur->href);
    }
}

/**
 * xmlNsListDumpOutput:
 * @buf:  the XML buffer output
 * @cur:  the first namespace
 *
 * Dump a list of local Namespace definitions.
 * Should be called in the context of attributes dumps.
 */
void
xmlNsListDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur) {
    while (cur != NULL) {
        xmlNsDumpOutput(buf, cur);
	cur = cur->next;
    }
}

/**
 * xmlDtdDumpOutput:
 * @buf:  the XML buffer output
 * @dtd:  the pointer to the DTD
 * 
 * Dump the XML document DTD, if any.
 */
static void
xmlDtdDumpOutput(xmlSaveCtxtPtr ctxt, xmlDtdPtr dtd) {
    xmlOutputBufferPtr buf;
    int format, level;
    xmlDocPtr doc;

    if (dtd == NULL) return;
    if ((ctxt == NULL) || (ctxt->buf == NULL))
        return;
    buf = ctxt->buf;
    xmlOutputBufferWrite(buf, 10, "<!DOCTYPE ");
    xmlOutputBufferWriteString(buf, (const char *)dtd->name);
    if (dtd->ExternalID != NULL) {
	xmlOutputBufferWrite(buf, 8, " PUBLIC ");
	xmlBufferWriteQuotedString(buf->buffer, dtd->ExternalID);
	xmlOutputBufferWrite(buf, 1, " ");
	xmlBufferWriteQuotedString(buf->buffer, dtd->SystemID);
    }  else if (dtd->SystemID != NULL) {
	xmlOutputBufferWrite(buf, 8, " SYSTEM ");
	xmlBufferWriteQuotedString(buf->buffer, dtd->SystemID);
    }
    if ((dtd->entities == NULL) && (dtd->elements == NULL) &&
        (dtd->attributes == NULL) && (dtd->notations == NULL) &&
	(dtd->pentities == NULL)) {
	xmlOutputBufferWrite(buf, 1, ">");
	return;
    }
    xmlOutputBufferWrite(buf, 3, " [\n");
    /*
     * Dump the notations first they are not in the DTD children list
     * Do this only on a standalone DTD or on the internal subset though.
     */
    if ((dtd->notations != NULL) && ((dtd->doc == NULL) ||
        (dtd->doc->intSubset == dtd))) {
        xmlDumpNotationTable(buf->buffer, (xmlNotationTablePtr) dtd->notations);
    }
    format = ctxt->format;
    level = ctxt->level;
    doc = ctxt->doc;
    ctxt->format = 0;
    ctxt->level = -1;
    ctxt->doc = dtd->doc;
    xmlNodeListDumpOutput(ctxt, dtd->children);
    ctxt->format = format;
    ctxt->level = level;
    ctxt->doc = doc;
    xmlOutputBufferWrite(buf, 2, "]>");
}

/**
 * xmlAttrDumpOutput:
 * @buf:  the XML buffer output
 * @cur:  the attribute pointer
 *
 * Dump an XML attribute
 */
static void
xmlAttrDumpOutput(xmlSaveCtxtPtr ctxt, xmlAttrPtr cur) {
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;
    if (buf == NULL) return;
    xmlOutputBufferWrite(buf, 1, " ");
    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
        xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
	xmlOutputBufferWrite(buf, 1, ":");
    }
    xmlOutputBufferWriteString(buf, (const char *)cur->name);
    xmlOutputBufferWrite(buf, 2, "=\"");
    xmlAttrSerializeContent(buf, cur);
    xmlOutputBufferWrite(buf, 1, "\"");
}

/**
 * xmlAttrListDumpOutput:
 * @buf:  the XML buffer output
 * @doc:  the document
 * @cur:  the first attribute pointer
 * @encoding:  an optional encoding string
 *
 * Dump a list of XML attributes
 */
static void
xmlAttrListDumpOutput(xmlSaveCtxtPtr ctxt, xmlAttrPtr cur) {
    if (cur == NULL) return;
    while (cur != NULL) {
        xmlAttrDumpOutput(ctxt, cur);
	cur = cur->next;
    }
}



/**
 * xmlNodeListDumpOutput:
 * @cur:  the first node
 *
 * Dump an XML node list, recursive behaviour, children are printed too.
 */
static void
xmlNodeListDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;
    while (cur != NULL) {
	if ((ctxt->format) && (xmlIndentTreeOutput) &&
	    (cur->type == XML_ELEMENT_NODE))
	    xmlOutputBufferWrite(buf, ctxt->indent_size *
	                         (ctxt->level > ctxt->indent_nr ? 
				  ctxt->indent_nr : ctxt->level),
				 ctxt->indent);
        xmlNodeDumpOutputInternal(ctxt, cur);
	if (ctxt->format) {
	    xmlOutputBufferWrite(buf, 1, "\n");
	}
	cur = cur->next;
    }
}

/**
 * xmlNodeDumpOutputInternal:
 * @cur:  the current node
 *
 * Dump an XML node, recursive behaviour, children are printed too.
 */
static void
xmlNodeDumpOutputInternal(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
    int format;
    xmlNodePtr tmp;
    xmlChar *start, *end;
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;
    if (cur->type == XML_XINCLUDE_START)
	return;
    if (cur->type == XML_XINCLUDE_END)
	return;
    if ((cur->type == XML_DOCUMENT_NODE) ||
        (cur->type == XML_HTML_DOCUMENT_NODE)) {
	xmlDocContentDumpOutput(ctxt, (xmlDocPtr) cur);
	return;
    }
    if (cur->type == XML_DTD_NODE) {
        xmlDtdDumpOutput(ctxt, (xmlDtdPtr) cur);
	return;
    }
    if (cur->type == XML_DOCUMENT_FRAG_NODE) {
        xmlNodeListDumpOutput(ctxt, cur->children);
	return;
    }
    if (cur->type == XML_ELEMENT_DECL) {
        xmlDumpElementDecl(buf->buffer, (xmlElementPtr) cur);
	return;
    }
    if (cur->type == XML_ATTRIBUTE_DECL) {
        xmlDumpAttributeDecl(buf->buffer, (xmlAttributePtr) cur);
	return;
    }
    if (cur->type == XML_ENTITY_DECL) {
        xmlDumpEntityDecl(buf->buffer, (xmlEntityPtr) cur);
	return;
    }
    if (cur->type == XML_TEXT_NODE) {
	if (cur->content != NULL) {
	    if (cur->name != xmlStringTextNoenc) {
                xmlOutputBufferWriteEscape(buf, cur->content, ctxt->escape);
	    } else {
		/*
		 * Disable escaping, needed for XSLT
		 */
		xmlOutputBufferWriteString(buf, (const char *) cur->content);
	    }
	}

	return;
    }
    if (cur->type == XML_PI_NODE) {
	if (cur->content != NULL) {
	    xmlOutputBufferWrite(buf, 2, "<?");
	    xmlOutputBufferWriteString(buf, (const char *)cur->name);
	    if (cur->content != NULL) {
		xmlOutputBufferWrite(buf, 1, " ");
		xmlOutputBufferWriteString(buf, (const char *)cur->content);
	    }
	    xmlOutputBufferWrite(buf, 2, "?>");
	} else {
	    xmlOutputBufferWrite(buf, 2, "<?");
	    xmlOutputBufferWriteString(buf, (const char *)cur->name);
	    xmlOutputBufferWrite(buf, 2, "?>");
	}
	return;
    }
    if (cur->type == XML_COMMENT_NODE) {
	if (cur->content != NULL) {
	    xmlOutputBufferWrite(buf, 4, "<!--");
	    xmlOutputBufferWriteString(buf, (const char *)cur->content);
	    xmlOutputBufferWrite(buf, 3, "-->");
	}
	return;
    }
    if (cur->type == XML_ENTITY_REF_NODE) {
        xmlOutputBufferWrite(buf, 1, "&");
	xmlOutputBufferWriteString(buf, (const char *)cur->name);
        xmlOutputBufferWrite(buf, 1, ";");
	return;
    }
    if (cur->type == XML_CDATA_SECTION_NODE) {
	start = end = cur->content;
	while (*end != '\0') {
	    if ((*end == ']') && (*(end + 1) == ']') && (*(end + 2) == '>')) {
		end = end + 2;
		xmlOutputBufferWrite(buf, 9, "<![CDATA[");
		xmlOutputBufferWrite(buf, end - start, (const char *)start);
		xmlOutputBufferWrite(buf, 3, "]]>");
		start = end;
	    }
	    end++;
	}
	if (start != end) {
	    xmlOutputBufferWrite(buf, 9, "<![CDATA[");
	    xmlOutputBufferWriteString(buf, (const char *)start);
	    xmlOutputBufferWrite(buf, 3, "]]>");
	}
	return;
    }
    if (cur->type == XML_ATTRIBUTE_NODE) {
	xmlAttrDumpOutput(ctxt, (xmlAttrPtr) cur);
	return;
    }
    if (cur->type == XML_NAMESPACE_DECL) {
	xmlNsDumpOutput(buf, (xmlNsPtr) cur);
	return;
    }

    format = ctxt->format;
    if (format == 1) {
	tmp = cur->children;
	while (tmp != NULL) {
	    if ((tmp->type == XML_TEXT_NODE) ||
		(tmp->type == XML_CDATA_SECTION_NODE) ||
		(tmp->type == XML_ENTITY_REF_NODE)) {
		ctxt->format = 0;
		break;
	    }
	    tmp = tmp->next;
	}
    }
    xmlOutputBufferWrite(buf, 1, "<");
    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
        xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
	xmlOutputBufferWrite(buf, 1, ":");
    }

    xmlOutputBufferWriteString(buf, (const char *)cur->name);
    if (cur->nsDef)
        xmlNsListDumpOutput(buf, cur->nsDef);
    if (cur->properties != NULL)
        xmlAttrListDumpOutput(ctxt, cur->properties);

    if (((cur->type == XML_ELEMENT_NODE) || (cur->content == NULL)) &&
	(cur->children == NULL) && (!xmlSaveNoEmptyTags)) {
        xmlOutputBufferWrite(buf, 2, "/>");
	ctxt->format = format;
	return;
    }
    xmlOutputBufferWrite(buf, 1, ">");
    if ((cur->type != XML_ELEMENT_NODE) && (cur->content != NULL)) {
	xmlOutputBufferWriteEscape(buf, cur->content, ctxt->escape);
    }
    if (cur->children != NULL) {
	if (ctxt->format) xmlOutputBufferWrite(buf, 1, "\n");
	if (ctxt->level >= 0) ctxt->level++;
	xmlNodeListDumpOutput(ctxt, cur->children);
	if (ctxt->level > 0) ctxt->level--;
	if ((xmlIndentTreeOutput) && (ctxt->format))
	    xmlOutputBufferWrite(buf, ctxt->indent_size *
	                         (ctxt->level > ctxt->indent_nr ? 
				  ctxt->indent_nr : ctxt->level),
				 ctxt->indent);
    }
    xmlOutputBufferWrite(buf, 2, "</");
    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
        xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
	xmlOutputBufferWrite(buf, 1, ":");
    }

    xmlOutputBufferWriteString(buf, (const char *)cur->name);
    xmlOutputBufferWrite(buf, 1, ">");
    ctxt->format = format;
}

/**
 * xmlDocContentDumpOutput:
 * @cur:  the document
 *
 * Dump an XML document.
 */
static void
xmlDocContentDumpOutput(xmlSaveCtxtPtr ctxt, xmlDocPtr cur) {
#ifdef LIBXML_HTML_ENABLED
    xmlDtdPtr dtd;
    int is_xhtml = 0;
#endif
    const xmlChar *oldenc = cur->encoding;
    const xmlChar *encoding = ctxt->encoding;
    xmlOutputBufferPtr buf;

    xmlInitParser();

    if (ctxt->encoding != NULL)
        cur->encoding = BAD_CAST ctxt->encoding;

    buf = ctxt->buf;
    xmlOutputBufferWrite(buf, 14, "<?xml version=");
    if (cur->version != NULL) 
	xmlBufferWriteQuotedString(buf->buffer, cur->version);
    else
	xmlOutputBufferWrite(buf, 5, "\"1.0\"");
    if (ctxt->encoding == NULL) {
	if (cur->encoding != NULL)
	    encoding = cur->encoding;
	else if (cur->charset != XML_CHAR_ENCODING_UTF8)
	    encoding = (const xmlChar *)
	         xmlGetCharEncodingName((xmlCharEncoding) cur->charset);
    }
    if (encoding != NULL) {
        xmlOutputBufferWrite(buf, 10, " encoding=");
	xmlBufferWriteQuotedString(buf->buffer, (xmlChar *) encoding);
    }
    switch (cur->standalone) {
        case 0:
	    xmlOutputBufferWrite(buf, 16, " standalone=\"no\"");
	    break;
        case 1:
	    xmlOutputBufferWrite(buf, 17, " standalone=\"yes\"");
	    break;
    }
    xmlOutputBufferWrite(buf, 3, "?>\n");

#ifdef LIBXML_HTML_ENABLED
    dtd = xmlGetIntSubset(cur);
    if (dtd != NULL) {
	is_xhtml = xmlIsXHTML(dtd->SystemID, dtd->ExternalID);
	if (is_xhtml < 0) is_xhtml = 0;
    }
    if (is_xhtml) {
	if (encoding != NULL)
	    htmlSetMetaEncoding(cur, (const xmlChar *) ctxt->encoding);
	else
	    htmlSetMetaEncoding(cur, BAD_CAST "UTF-8");
    }
#endif
    if (cur->children != NULL) {
        xmlNodePtr child = cur->children;

	while (child != NULL) {
	    ctxt->level = 0;
#ifdef LIBXML_HTML_ENABLED
	    if (is_xhtml)
		xhtmlNodeDumpOutput(ctxt, child);
	    else
#endif
		xmlNodeDumpOutputInternal(ctxt, child);
	    xmlOutputBufferWrite(buf, 1, "\n");
	    child = child->next;
	}
    }
    if (ctxt->encoding != NULL)
        cur->encoding = oldenc;
}

#ifdef LIBXML_HTML_ENABLED
/************************************************************************
 *									*
 *		Functions specific to XHTML serialization		*
 *									*
 ************************************************************************/

/**
 * xhtmlIsEmpty:
 * @node:  the node
 *
 * Check if a node is an empty xhtml node
 *