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/* neon XML parser interface Copyright © 1999-2007, Joe Orton joe@manyfish.co.uk

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details.

You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA


ifndef NE_XML_H

define NE_XML_H

include <sys/types.h> / for size_t /

include “ne_defs.h”


/ The neon XML interface filters a streamed XML tree through a stack * of SAX “handlers”. A handler is made up of three callbacks * (start-element, char-data, end-element). Each start-element event * is passed to each handler in the stack in turn until one until one * accepts the element. This handler then receives subsequent * char-data and end-element events for the element. * * For each new start-element event, the search up the handler stack * begins with the handler for the parent element (for the root * element, at the base of the stack). * * For each accepted element, a “state” integer is stored, which is * passed to the corresponding char-data and end-element callbacks for * the element. This integer is also passed to the start-element * callback of child elements so they can determine context. * * If no handler in the stack accepts a particular element, it (and * its children, if any) is ignored. /

define NE_XML_DECLINE (0)

define NE_XML_ABORT (-1)

/ A start-element callback for element with given namespace/name. * The callback may return: * <0 => abort the parse (NE_XML_ABORT) * 0 => decline this element (NE_XML_DECLINE) * >0 => accept this element; value is state for this element. * * The ‘parent’ integer is the state returned by the handler of the * parent element. The attributes array gives name/value pairs * in atts[n] and atts[n+1] from n=0 up to atts[n]==NULL. / typedef int ne_xml_startelm_cb(void userdata, int parent, const char nspace, const char *name, const char **atts);

/ state for the root element /


/ Character data callback; may return non-zero to abort the parse. / typedef int ne_xml_cdata_cb(void userdata, int state, const char cdata, size_t len); / End element callback; may return non-zero to abort the parse. / typedef int ne_xml_endelm_cb(void userdata, int state, const char nspace, const char *name);

typedef struct ne_xml_parser_s ne_xml_parser;

/ Create an XML parser. / ne_xml_parser *ne_xml_create(void);

/ Push a new handler on the stack of parser ‘p’. ‘cdata’ and/or * ‘endelm’ may be NULL; startelm must be non-NULL. / void ne_xml_push_handler(ne_xml_parser p, ne_xml_startelm_cb startelm, ne_xml_cdata_cb cdata, ne_xml_endelm_cb endelm, void *userdata);

/ ne_xml_failed returns non-zero if there was an error during * parsing, or zero if the parse completed successfully. The return * value is equal to that of the last ne_xml_parse() call for this * parser object. / int ne_xml_failed(ne_xml_parser *p);

/ Set error string for parser. (The string may be truncated * internally). / void ne_xml_set_error(ne_xml_parser p, const char msg);

/ Return the error string (and never NULL). After ne_xml_failed * returns >0, this will describe the parse error. Otherwise it will * be a default error string. / const char ne_xml_get_error(ne_xml_parser p);

/ Parse the given block of input of length len. Parser must be * called with len=0 to signify the end of the document (for that * case, the block argument is ignored). Returns zero on success, or * non-zero on error: for an XML syntax error, a positive number is * returned; if parsing is aborted by a caller-supplied callback, that * callback’s return value is returned. / int ne_xml_parse(ne_xml_parser p, const char block, size_t len);

/ As ne_xml_parse, casting (ne_xml_parser )userdata internally. * (This function can be passed to ne_add_response_body_reader) / int ne_xml_parse_v(void userdata, const char *block, size_t len);

/ Return current line of document during parsing or after parsing is * complete. / int ne_xml_currentline(ne_xml_parser *p);

/ From a start_element callback which was passed ‘attrs’ using given * parser, return attribute of given name and namespace. If nspace is * NULL, no namespace resolution is performed. Note that this call is * context-specific; if called outside a start_element callback, * behaviour is undefined. / const char ne_xml_get_attr(ne_xml_parser parser, const char attrs, const char nspace, const char name);

/ From a start_element callback, resolve a given XML Namespace * prefix, if defined. Given a non-NULL prefix, returns the namespace * URI which corresponds to the prefix ‘prefix’ (of length ‘length’), * or NULL if no such namespace prefix is defined. Given a NULL * prefix, returns the default namespace URI or the empty string if * none is defined. Note that this call is context-specific; if * called outside a start_element callback, behaviour is undefined. / const char ne_xml_resolve_nspace(ne_xml_parser parser, const char *prefix, size_t length);

/ Return the encoding of the document being parsed. May return NULL * if no encoding is defined or if the XML declaration has not yet * been parsed. / const char ne_xml_doc_encoding(const ne_xml_parser p);

/ Destroy the parser object. / void ne_xml_destroy(ne_xml_parser *p);

/ A utility interface for mapping {nspace, name} onto an integer. / struct ne_xml_idmap { const char nspace, name; int id; };

/ Return the size of an idmap array /

define NE_XML_MAPLEN(map) (sizeof(map) / sizeof(struct ne_xml_idmap))

/ Return the ‘id’ corresponding to {nspace, name}, or zero. / int ne_xml_mapid(const struct ne_xml_idmap map[], size_t maplen, const char nspace, const char name);

/ media type, appropriate for adding to a Content-Type header /

define NE_XML_MEDIA_TYPE “application/xml”


endif / NE_XML_H /