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/*
* Copyright (c) 2002, Jon Travis
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef EKHTML_DOT_H
#define EKHTML_DOT_H
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
/*!
* \file ekhtml.h
* \brief Main El-Kabong header file.
*
* This header defines everything that a program should need to use
* the El-Kabong library.
*/
/**
* A string object, which is not NUL terminated.
* For speed reasons, El-Kabong does not deal with zero-terminated
* strings.
*/
typedef struct ekhtml_string_t {
const char *str; /**< Actual string data */
size_t len; /**< Length of the data in `str` */
} ekhtml_string_t;
/**
* Attribute object, passed into callbacks.
* When ekhtml parses tags containing key/value attributes, it will pass
* this structure representing those values into the callbacks. Note, for
* speed reasons, things such as the 'name' and 'value' fields are not
* terminated with '\0', and therefore have an associated length
* field (namelen, vallen).
*/
typedef struct ekhtml_attr_t {
ekhtml_string_t name; /**< Name of the attribute */
ekhtml_string_t val; /**< Value of the attribute */
unsigned int isBoolean; /**< True of the attribute is boolean */
struct ekhtml_attr_t *next; /**< Pointer to next attribute in the list */
} ekhtml_attr_t;
/*
* Typedefs for function callback types
*/
/**
* The parser object.
* The parser object holds state information, such as which callbacks
* to invoke when reading tags, how much data is being processed, etc.
*/
typedef struct ekhtml_parser_t ekhtml_parser_t;
/**
* Callback for simple data.
* Callback functions of this form are used to process data which is
* not part of a start or end tag. This callback may also be used
* to process the body of comment tags.
*
* I.e. <FOO>data_to_process</FOO>
* The data passed into the callback function will be "data_to_process"
*
* @param cbdata Callback data, as previously set by ekhtml_parser_cbdata_set
* @param data A pointer to the data in-between tags.
*
* @see ekhtml_parser_cbdata_set()
* @see ekhtml_parser_datacb_set()
*/
typedef void (*ekhtml_data_cb_t)(void *cbdata, ekhtml_string_t *data);
/**
* Callback for start tags.
* Callback functions of this form are used to process start tags.
*
* I.e. <FOO>data_to_process</FOO>
* The tag passed into the callback will be "FOO" with a length of 3.
*
* @param cbdata Callback data, as previously set by ekhtml_parser_cbdata_set
* @param tag A pointer to tag name. This is a traditional NUL terminated
* string.
* @param attrs Attributes of the tag.
*
* @see ekhtml_parser_cbdata_set()
* @see ekhtml_parser_startcb_add()
*/
typedef void (*ekhtml_starttag_cb_t)(void *cbdata, ekhtml_string_t *tag,
ekhtml_attr_t *attrs);
/**
* Callback for end tags.
* Callback functions of this form are used to process end tags.
*
* I.e. <FOO>data_to_process</FOO>
* The tag passed into the callback will be "FOO" with a length of 3.
*
* @param cbdata Callback data, as previously set by ekhtml_parser_cbdata_set
* @param tag A pointer to tag name. This is a traditional NUL terminated
* string.
*
* @see ekhtml_parser_cbdata_set()
* @see ekhtml_parser_endcb_add()
*/
typedef void (*ekhtml_endtag_cb_t)(void *cbdata, ekhtml_string_t *tag);
/**
* Create a new parser object.
* This routine creates a new parser object, with no set callback
* functions or state.
*
* @param cbdata Callback data to use when invoking callbacks
*
* @returns A new ekhtml_parser_t object
*
* @see ekhtml_parser_cbdata_set()
*/
extern ekhtml_parser_t *ekhtml_parser_new(void *cbdata);
/**
* Destroys a parser object and all memory associated with it.
* After calling this routine, the parser should no longer be
* used, as any results would be undefined.
*
* @param parser The parser to destroy
*
* @see ekhtml_parser_new()
*/
extern void ekhtml_parser_destroy(ekhtml_parser_t *parser);
/**
* Set the callback data for the parser.
* This routine sets the callback data which is passed to set callbacks.
*
* @param parser Parser to set the callback data for
* @param cbdata Callback data the parser should use to pass to callbacks
*/
extern void ekhtml_parser_cbdata_set(ekhtml_parser_t *parser, void *cbdata);
/**
* Set the parser's data callback.
* This routine sets the callback which should be invoked for
* non-tagged data.
*
* @param parser Parser to set the callback for
* @param cb Callback to invoke when processing non-tagged data
*/
extern void ekhtml_parser_datacb_set(ekhtml_parser_t *parser,
ekhtml_data_cb_t cb);
/**
* Set the parser's comment callback.
* This routine sets the callback which should be invoked when
* the parser processes a comment.
*
* @param parser Parser to set the callback for
* @param cb Callback to invoke when processing a comment
*/
extern void ekhtml_parser_commentcb_set(ekhtml_parser_t *parser,
ekhtml_data_cb_t cb);
/**
* Feed data for the parser to process.
* Feed data into the HTML parser. This routine will fill up the
* internal buffer until it can go no more, then flush the data
* and refill. If there is more data that is required than the
* internal buffer can hold, it will be resized
*
* @param parser Parser to feed data to
* @param data Data to feed to the parser
*/
extern void ekhtml_parser_feed(ekhtml_parser_t *parser,
ekhtml_string_t *data);
/**
* Flush the parser innards.
* When this function is invoked, the parser will flush all data that is
* currently held, and any remaining state is saved. All data which is
* processed is removed from the parser, and the internal buffer is
* reshuffled.
*
* @param parser Parser to flush
* @param flushall If true, will flush all data, even if tags are not
* complete (i.e. "<FO")
* @returns 1 if action was taken (i.e. bytes were processed and the
* internal buffer was reshuffled) else 0
*/
extern int ekhtml_parser_flush(ekhtml_parser_t *parser, int flushall);
/**
* Add a callback for a start tag.
* This routine sets the callback which should be invoked when
* the parser processes a start tag. Both specific tags, and
* unknown tags can be used with this method.
*
* @param parser Parser to set the callback for
* @param tag Name of the tag to call `cb` for. If `tag` is NULL, then
* any tags which are unknown to the parser will be sent
* to the callback specified by `cb`.
* @param cb Callback to invoke
*/
extern void ekhtml_parser_startcb_add(ekhtml_parser_t *parser, const char *tag,
ekhtml_starttag_cb_t cb);
/**
* Add a callback for an end tag.
* This routine sets the callback which should be invoked when
* the parser processes an end tag. Both specific tags, and
* unknown tags can be used with this method.
*
* @param parser Parser to set the callback for
* @param tag Name of the tag to call `cb` for. If `tag` is NULL, then
* any tags which are unknown to the parser will be sent
* to the callback specified by `cb`.
* @param cb Callback to invoke
*/
extern void ekhtml_parser_endcb_add(ekhtml_parser_t *parser, const char *tag,
ekhtml_endtag_cb_t cb);
/** EKHTML_BLOCKSIZE = # of blocks to allocate per chunk */
#define EKHTML_BLOCKSIZE (1024 * 4)
#ifdef __cplusplus
}
#endif
#endif
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