/*
 * Summary: interface for an HTML 4.0 non-verifying parser
 * Description: this module implements an HTML 4.0 non-verifying parser
 *              with API compatible with the XML parser ones. It should
 *              be able to parse "real world" HTML, even if severely
 *              broken from a specification point of view.
 *
 * Copy: See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#ifndef __HTML_PARSER_H__
#define __HTML_PARSER_H__
#include "xmlversion.h"
#include "parser.h"

#ifdef LIBXML_HTML_ENABLED

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Most of the back-end structures from XML and HTML are shared.
 */
typedef xmlParserCtxt htmlParserCtxt;
typedef xmlParserCtxtPtr htmlParserCtxtPtr;
typedef xmlParserNodeInfo htmlParserNodeInfo;
typedef xmlSAXHandler htmlSAXHandler;
typedef xmlSAXHandlerPtr htmlSAXHandlerPtr;
typedef xmlParserInput htmlParserInput;
typedef xmlParserInputPtr htmlParserInputPtr;
typedef xmlDocPtr htmlDocPtr;
typedef xmlNodePtr htmlNodePtr;

/*
 * Internal description of an HTML element, representing HTML 4.01
 * and XHTML 1.0 (which share the same structure).
 */
typedef struct _htmlElemDesc htmlElemDesc;
typedef htmlElemDesc *htmlElemDescPtr;
struct _htmlElemDesc {
    const char *name;   /* The tag name */
    char startTag;      /* Whether the start tag can be implied */
    char endTag;        /* Whether the end tag can be implied */
    char saveEndTag;    /* Whether the end tag should be saved */
    char empty;         /* Is this an empty element ? */
    char depr;          /* Is this a deprecated element ? */
    char dtd;           /* 1: only in Loose DTD, 2: only Frameset one */
    char isinline;      /* is this a block 0 or inline 1 element */
    const char *desc;   /* the description */

/* NRK Jan.2003
 * New fields encapsulating HTML structure
 *
 * Bugs:
 *      This is a very limited representation.  It fails to tell us when
 *      an element *requires* subelements (we only have whether they're
 *      allowed or not), and it doesn't tell us where CDATA and PCDATA
 *      are allowed.  Some element relationships are not fully represented:
 *      these are flagged with the word MODIFIER
 */
    const char** subelts;               /* allowed sub-elements of this element */
    const char* defaultsubelt;  /* subelement for suggested auto-repair
                                           if necessary or NULL */
    const char** attrs_opt;             /* Optional Attributes */
    const char** attrs_depr;            /* Additional deprecated attributes */
    const char** attrs_req;             /* Required attributes */
};

/*
 * Internal description of an HTML entity.
 */
typedef struct _htmlEntityDesc htmlEntityDesc;
typedef htmlEntityDesc *htmlEntityDescPtr;
struct _htmlEntityDesc {
    unsigned int value; /* the UNICODE value for the character */
    const char *name;   /* The entity name */
    const char *desc;   /* the description */
};

/*
 * There is only few public functions.
 */
XMLPUBFUN const htmlElemDesc * XMLCALL  
                        htmlTagLookup   (const xmlChar *tag);
XMLPUBFUN const htmlEntityDesc * XMLCALL        
                        htmlEntityLookup(const xmlChar *name);
XMLPUBFUN const htmlEntityDesc * XMLCALL        
                        htmlEntityValueLookup(unsigned int value);

XMLPUBFUN int XMLCALL                   
                        htmlIsAutoClosed(htmlDocPtr doc,
                                         htmlNodePtr elem);
XMLPUBFUN int XMLCALL                   
                        htmlAutoCloseTag(htmlDocPtr doc,
                                         const xmlChar *name,
                                         htmlNodePtr elem);
XMLPUBFUN const htmlEntityDesc * XMLCALL        
                        htmlParseEntityRef(htmlParserCtxtPtr ctxt,
                                         const xmlChar **str);
XMLPUBFUN int XMLCALL                   
                        htmlParseCharRef(htmlParserCtxtPtr ctxt);
XMLPUBFUN void XMLCALL                  
                        htmlParseElement(htmlParserCtxtPtr ctxt);

XMLPUBFUN htmlParserCtxtPtr XMLCALL     
                        htmlNewParserCtxt(void);

XMLPUBFUN htmlParserCtxtPtr XMLCALL     
                        htmlCreateMemoryParserCtxt(const char *buffer,
                                                   int size);

XMLPUBFUN int XMLCALL                   
                        htmlParseDocument(htmlParserCtxtPtr ctxt);
XMLPUBFUN htmlDocPtr XMLCALL            
                        htmlSAXParseDoc (xmlChar *cur,
                                         const char *encoding,
                                         htmlSAXHandlerPtr sax,
                                         void *userData);
XMLPUBFUN htmlDocPtr XMLCALL            
                        htmlParseDoc    (xmlChar *cur,
                                         const char *encoding);
XMLPUBFUN htmlDocPtr XMLCALL            
                        htmlSAXParseFile(const char *filename,
                                         const char *encoding,
                                         htmlSAXHandlerPtr sax,
                                         void *userData);
XMLPUBFUN htmlDocPtr XMLCALL            
                        htmlParseFile   (const char *filename,
                                         const char *encoding);
XMLPUBFUN int XMLCALL                   
                        UTF8ToHtml      (unsigned char *out,
                                         int *outlen,
                                         const unsigned char *in,
                                         int *inlen);
XMLPUBFUN int XMLCALL                   
                        htmlEncodeEntities(unsigned char *out,
                                         int *outlen,
                                         const unsigned char *in,
                                         int *inlen, int quoteChar);
XMLPUBFUN int XMLCALL                   
                        htmlIsScriptAttribute(const xmlChar *name);
XMLPUBFUN int XMLCALL                   
                        htmlHandleOmittedElem(int val);

#ifdef LIBXML_PUSH_ENABLED
/**
 * Interfaces for the Push mode.
 */
XMLPUBFUN htmlParserCtxtPtr XMLCALL     
                        htmlCreatePushParserCtxt(htmlSAXHandlerPtr sax,
                                                 void *user_data,
                                                 const char *chunk,
                                                 int size,
                                                 const char *filename,
                                                 xmlCharEncoding enc);
XMLPUBFUN int XMLCALL                   
                        htmlParseChunk          (htmlParserCtxtPtr ctxt,
                                                 const char *chunk,
                                                 int size,
                                                 int terminate);
#endif /* LIBXML_PUSH_ENABLED */

XMLPUBFUN void XMLCALL                  
                        htmlFreeParserCtxt      (htmlParserCtxtPtr ctxt);

/*
 * New set of simpler/more flexible APIs
 */
/**
 * xmlParserOption:
 *
 * This is the set of XML parser options that can be passed down
 * to the xmlReadDoc() and similar calls.
 */
typedef enum {
    HTML_PARSE_RECOVER  = 1<<0, /* Relaxed parsing */
    HTML_PARSE_NOERROR  = 1<<5, /* suppress error reports */
    HTML_PARSE_NOWARNING= 1<<6, /* suppress warning reports */
    HTML_PARSE_PEDANTIC = 1<<7, /* pedantic error reporting */
    HTML_PARSE_NOBLANKS = 1<<8, /* remove blank nodes */
    HTML_PARSE_NONET    = 1<<11,/* Forbid network access */
    HTML_PARSE_COMPACT  = 1<<16 /* compact small text nodes */
} htmlParserOption;

XMLPUBFUN void XMLCALL
                htmlCtxtReset           (htmlParserCtxtPtr ctxt);
XMLPUBFUN int XMLCALL
                htmlCtxtUseOptions      (htmlParserCtxtPtr ctxt,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlReadDoc             (const xmlChar *cur,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlReadFile            (const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlReadMemory          (const char *buffer,
                                         int size,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlReadFd              (int fd,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlReadIO              (xmlInputReadCallback ioread,
                                         xmlInputCloseCallback ioclose,
                                         void *ioctx,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlCtxtReadDoc         (xmlParserCtxtPtr ctxt,
                                         const xmlChar *cur,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlCtxtReadFile                (xmlParserCtxtPtr ctxt,
                                         const char *filename,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlCtxtReadMemory              (xmlParserCtxtPtr ctxt,
                                         const char *buffer,
                                         int size,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlCtxtReadFd          (xmlParserCtxtPtr ctxt,
                                         int fd,
                                         const char *URL,
                                         const char *encoding,
                                         int options);
XMLPUBFUN htmlDocPtr XMLCALL
                htmlCtxtReadIO          (xmlParserCtxtPtr ctxt,
                                         xmlInputReadCallback ioread,
                                         xmlInputCloseCallback ioclose,
                                         void *ioctx,
                                         const char *URL,
                                         const char *encoding,
                                         int options);

/* NRK/Jan2003: further knowledge of HTML structure
 */
typedef enum {
  HTML_NA = 0 ,         /* something we don't check at all */
  HTML_INVALID = 0x1 ,
  HTML_DEPRECATED = 0x2 ,
  HTML_VALID = 0x4 ,
  HTML_REQUIRED = 0xc /* VALID bit set so ( & HTML_VALID ) is TRUE */
} htmlStatus ;

/* Using htmlElemDesc rather than name here, to emphasise the fact
   that otherwise there's a lookup overhead
*/
XMLPUBFUN htmlStatus XMLCALL htmlAttrAllowed(const htmlElemDesc*, const xmlChar*, int) ;
XMLPUBFUN int XMLCALL htmlElementAllowedHere(const htmlElemDesc*, const xmlChar*) ;
XMLPUBFUN htmlStatus XMLCALL htmlElementStatusHere(const htmlElemDesc*, const htmlElemDesc*) ;
XMLPUBFUN htmlStatus XMLCALL htmlNodeStatus(const htmlNodePtr, int) ;
/**
 * htmlDefaultSubelement:
 * @elt: HTML element
 *
 * Returns the default subelement for this element
 */
#define htmlDefaultSubelement(elt) elt->defaultsubelt
/**
 * htmlElementAllowedHereDesc:
 * @parent: HTML parent element
 * @elt: HTML element
 *
 * Checks whether an HTML element description may be a
 * direct child of the specified element.
 *
 * Returns 1 if allowed; 0 otherwise.
 */
#define htmlElementAllowedHereDesc(parent,elt) \
        htmlElementAllowedHere((parent), (elt)->name)
/**
 * htmlRequiredAttrs:
 * @elt: HTML element
 *
 * Returns the attributes required for the specified element.
 */
#define htmlRequiredAttrs(elt) (elt)->attrs_req


#ifdef __cplusplus
}
#endif

#endif /* LIBXML_HTML_ENABLED */
#endif /* __HTML_PARSER_H__ */
