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HTMLparser

HTMLparser - interface for an HTML 4.0 non-verifying parser

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.

Author(s): Daniel Veillard

Synopsis

#define htmlDefaultSubelement(elt);
#define htmlElementAllowedHereDesc(parent, elt);
#define htmlRequiredAttrs(elt);
typedef xmlParserNodeInfo htmlParserNodeInfo;
typedef xmlParserInput htmlParserInput;
typedef xmlParserCtxtPtr htmlParserCtxtPtr;
typedef struct _htmlEntityDesc htmlEntityDesc;
typedef xmlDocPtr htmlDocPtr;
typedef xmlSAXHandlerPtr htmlSAXHandlerPtr;
typedef enum htmlStatus;
typedef xmlNodePtr htmlNodePtr;
typedef htmlElemDesc * htmlElemDescPtr;
typedef struct _htmlElemDesc htmlElemDesc;
typedef xmlSAXHandler htmlSAXHandler;
typedef xmlParserInputPtr htmlParserInputPtr;
typedef enum htmlParserOption;
typedef htmlEntityDesc * htmlEntityDescPtr;
typedef xmlParserCtxt htmlParserCtxt;
int	htmlIsScriptAttribute		(const xmlChar * name);
int	htmlHandleOmittedElem		(int val);
htmlDocPtr	htmlReadFd		(int fd, 
const char * URL,
const char * encoding,
int options); htmlDocPtr htmlReadIO (xmlInputReadCallback ioread,
xmlInputCloseCallback ioclose,
void * ioctx,
const char * URL,
const char * encoding,
int options); htmlDocPtr htmlParseFile (const char * filename,
const char * encoding); htmlDocPtr htmlCtxtReadDoc (htmlParserCtxtPtr ctxt,
const xmlChar * cur,
const char * URL,
const char * encoding,
int options); int htmlAutoCloseTag (htmlDocPtr doc,
const xmlChar * name,
htmlNodePtr elem); int htmlParseChunk (htmlParserCtxtPtr ctxt,
const char * chunk,
int size,
int terminate); const htmlElemDesc * htmlTagLookup (const xmlChar * tag); htmlParserCtxtPtr htmlCreateMemoryParserCtxt (const char * buffer,
int size); void htmlCtxtReset (htmlParserCtxtPtr ctxt); int htmlElementAllowedHere (const htmlElemDesc * parent,
const xmlChar * elt); htmlDocPtr htmlCtxtReadIO (htmlParserCtxtPtr ctxt,
xmlInputReadCallback ioread,
xmlInputCloseCallback ioclose,
void * ioctx,
const char * URL,
const char * encoding,
int options); htmlParserCtxtPtr htmlCreatePushParserCtxt (htmlSAXHandlerPtr sax,
void * user_data,
const char * chunk,
int size,
const char * filename,
xmlCharEncoding enc); htmlDocPtr htmlReadMemory (const char * buffer,
int size,
const char * URL,
const char * encoding,
int options); int htmlIsAutoClosed (htmlDocPtr doc,
htmlNodePtr elem); int htmlParseCharRef (htmlParserCtxtPtr ctxt); htmlDocPtr htmlReadDoc (const xmlChar * cur,
const char * URL,
const char * encoding,
int options); int htmlEncodeEntities (unsigned char * out,
int * outlen,
const unsigned char * in,
int * inlen,
int quoteChar); htmlStatus htmlNodeStatus (const htmlNodePtr node,
int legacy); htmlStatus htmlAttrAllowed (const htmlElemDesc * elt,
const xmlChar * attr,
int legacy); htmlDocPtr htmlSAXParseFile (const char * filename,
const char * encoding,
htmlSAXHandlerPtr sax,
void * userData); const htmlEntityDesc * htmlParseEntityRef (htmlParserCtxtPtr ctxt,
const xmlChar ** str); htmlStatus htmlElementStatusHere (const htmlElemDesc * parent,
const htmlElemDesc * elt); const htmlEntityDesc * htmlEntityValueLookup (unsigned int value); void htmlParseElement (htmlParserCtxtPtr ctxt); int UTF8ToHtml (unsigned char * out,
int * outlen,
const unsigned char * in,
int * inlen); const htmlEntityDesc * htmlEntityLookup (const xmlChar * name); void htmlFreeParserCtxt (htmlParserCtxtPtr ctxt); htmlDocPtr htmlCtxtReadMemory (htmlParserCtxtPtr ctxt,
const char * buffer,
int size,
const char * URL,
const char * encoding,
int options); htmlDocPtr htmlCtxtReadFd (htmlParserCtxtPtr ctxt,
int fd,
const char * URL,
const char * encoding,
int options); htmlDocPtr htmlReadFile (const char * filename,
const char * encoding,
int options); htmlDocPtr htmlCtxtReadFile (htmlParserCtxtPtr ctxt,
const char * filename,
const char * encoding,
int options); int htmlParseDocument (htmlParserCtxtPtr ctxt); htmlParserCtxtPtr htmlNewParserCtxt (void); htmlDocPtr htmlSAXParseDoc (const xmlChar * cur,
const char * encoding,
htmlSAXHandlerPtr sax,
void * userData); int htmlCtxtUseOptions (htmlParserCtxtPtr ctxt,
int options); htmlDocPtr htmlParseDoc (const xmlChar * cur,
const char * encoding);

Description

Details

Macro htmlDefaultSubelement

#define htmlDefaultSubelement(elt);

Returns the default subelement for this element

elt:HTML element

Macro htmlElementAllowedHereDesc

#define htmlElementAllowedHereDesc(parent, elt);

Checks whether an HTML element description may be a direct child of the specified element. Returns 1 if allowed; 0 otherwise.

parent:HTML parent element
elt:HTML element

Macro htmlRequiredAttrs

#define htmlRequiredAttrs(elt);

Returns the attributes required for the specified element.

elt:HTML element

Typedef htmlDocPtr

xmlDocPtr htmlDocPtr;


Structure htmlElemDesc

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 structur
    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
} htmlElemDesc;


Typedef htmlElemDescPtr

htmlElemDesc * htmlElemDescPtr;


Structure htmlEntityDesc

struct _htmlEntityDesc {
    unsigned int	value	: the UNICODE value for the character
    const char *	name	: The entity name
    const char *	desc	: the description
} htmlEntityDesc;


Typedef htmlEntityDescPtr

htmlEntityDesc * htmlEntityDescPtr;


Typedef htmlNodePtr

xmlNodePtr htmlNodePtr;


Typedef htmlParserCtxt

xmlParserCtxt htmlParserCtxt;


Typedef htmlParserCtxtPtr

xmlParserCtxtPtr htmlParserCtxtPtr;


Typedef htmlParserInput

xmlParserInput htmlParserInput;


Typedef htmlParserInputPtr

xmlParserInputPtr htmlParserInputPtr;


Typedef htmlParserNodeInfo

xmlParserNodeInfo htmlParserNodeInfo;


Enum htmlParserOption

enum htmlParserOption {
    HTML_PARSE_RECOVER = 1 /* Relaxed parsing */
    HTML_PARSE_NODEFDTD = 4 /* do not default a doctype if not found */
    HTML_PARSE_NOERROR = 32 /* suppress error reports */
    HTML_PARSE_NOWARNING = 64 /* suppress warning reports */
    HTML_PARSE_PEDANTIC = 128 /* pedantic error reporting */
    HTML_PARSE_NOBLANKS = 256 /* remove blank nodes */
    HTML_PARSE_NONET = 2048 /* Forbid network access */
    HTML_PARSE_NOIMPLIED = 8192 /* Do not add implied html/body... elements */
    HTML_PARSE_COMPACT = 65536 /* compact small text nodes */
    HTML_PARSE_IGNORE_ENC = 2097152 /*  ignore internal document encoding hint */
};


Typedef htmlSAXHandler

xmlSAXHandler htmlSAXHandler;


Typedef htmlSAXHandlerPtr

xmlSAXHandlerPtr htmlSAXHandlerPtr;


Enum htmlStatus

enum htmlStatus {
    HTML_NA = 0 /* something we don't check at all */
    HTML_INVALID = 1
    HTML_DEPRECATED = 2
    HTML_VALID = 4
    HTML_REQUIRED = 12 /*  VALID bit set so ( & HTML_VALID ) is TRUE */
};



htmlAttrAllowed ()

htmlStatus	htmlAttrAllowed		(const htmlElemDesc * elt, 
const xmlChar * attr,
int legacy)

Checks whether an attribute is valid for an element Has full knowledge of Required and Deprecated attributes

elt:HTML element
attr:HTML attribute
legacy:whether to allow deprecated attributes
Returns:one of HTML_REQUIRED, HTML_VALID, HTML_DEPRECATED, HTML_INVALID

htmlAutoCloseTag ()

int	htmlAutoCloseTag		(htmlDocPtr doc, 
const xmlChar * name,
htmlNodePtr elem)

The HTML DTD allows a tag to implicitly close other tags. The list is kept in htmlStartClose array. This function checks if the element or one of it's children would autoclose the given tag.

doc:the HTML document
name:The tag name
elem:the HTML element
Returns:1 if autoclose, 0 otherwise

htmlCreateMemoryParserCtxt ()

htmlParserCtxtPtr	htmlCreateMemoryParserCtxt	(const char * buffer, 
int size)

Create a parser context for an HTML in-memory document.

buffer:a pointer to a char array
size:the size of the array
Returns:the new parser context or NULL

htmlCreatePushParserCtxt ()

htmlParserCtxtPtr	htmlCreatePushParserCtxt	(htmlSAXHandlerPtr sax, 
void * user_data,
const char * chunk,
int size,
const char * filename,
xmlCharEncoding enc)

Create a parser context for using the HTML parser in push mode The value of @filename is used for fetching external entities and error/warning reports.

sax:a SAX handler
user_data:The user data returned on SAX callbacks
chunk:a pointer to an array of chars
size:number of chars in the array
filename:an optional file name or URI
enc:an optional encoding
Returns:the new parser context or NULL

htmlCtxtReadDoc ()

htmlDocPtr	htmlCtxtReadDoc		(htmlParserCtxtPtr ctxt, 
const xmlChar * cur,
const char * URL,
const char * encoding,
int options)

parse an XML in-memory document and build a tree. This reuses the existing @ctxt parser context

ctxt:an HTML parser context
cur:a pointer to a zero terminated string
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlCtxtReadFd ()

htmlDocPtr	htmlCtxtReadFd		(htmlParserCtxtPtr ctxt, 
int fd,
const char * URL,
const char * encoding,
int options)

parse an XML from a file descriptor and build a tree. This reuses the existing @ctxt parser context

ctxt:an HTML parser context
fd:an open file descriptor
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlCtxtReadFile ()

htmlDocPtr	htmlCtxtReadFile	(htmlParserCtxtPtr ctxt, 
const char * filename,
const char * encoding,
int options)

parse an XML file from the filesystem or the network. This reuses the existing @ctxt parser context

ctxt:an HTML parser context
filename:a file or URL
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlCtxtReadIO ()

htmlDocPtr	htmlCtxtReadIO		(htmlParserCtxtPtr ctxt, 
xmlInputReadCallback ioread,
xmlInputCloseCallback ioclose,
void * ioctx,
const char * URL,
const char * encoding,
int options)

parse an HTML document from I/O functions and source and build a tree. This reuses the existing @ctxt parser context

ctxt:an HTML parser context
ioread:an I/O read function
ioclose:an I/O close function
ioctx:an I/O handler
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlCtxtReadMemory ()

htmlDocPtr	htmlCtxtReadMemory	(htmlParserCtxtPtr ctxt, 
const char * buffer,
int size,
const char * URL,
const char * encoding,
int options)

parse an XML in-memory document and build a tree. This reuses the existing @ctxt parser context

ctxt:an HTML parser context
buffer:a pointer to a char array
size:the size of the array
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlCtxtReset ()

void	htmlCtxtReset			(htmlParserCtxtPtr ctxt)

Reset a parser context

ctxt:an HTML parser context

htmlCtxtUseOptions ()

int	htmlCtxtUseOptions		(htmlParserCtxtPtr ctxt, 
int options)

Applies the options to the parser context

ctxt:an HTML parser context
options:a combination of htmlParserOption(s)
Returns:0 in case of success, the set of unknown or unimplemented options in case of error.

htmlElementAllowedHere ()

int	htmlElementAllowedHere		(const htmlElemDesc * parent, 
const xmlChar * elt)

Checks whether an HTML element may be a direct child of a parent element. Note - doesn't check for deprecated elements

parent:HTML parent element
elt:HTML element
Returns:1 if allowed; 0 otherwise.

htmlElementStatusHere ()

htmlStatus	htmlElementStatusHere	(const htmlElemDesc * parent, 
const htmlElemDesc * elt)

Checks whether an HTML element may be a direct child of a parent element. and if so whether it is valid or deprecated.

parent:HTML parent element
elt:HTML element
Returns:one of HTML_VALID, HTML_DEPRECATED, HTML_INVALID


htmlEntityLookup ()

const htmlEntityDesc *	htmlEntityLookup	(const xmlChar * name)

Lookup the given entity in EntitiesTable TODO: the linear scan is really ugly, an hash table is really needed.

name:the entity name
Returns:the associated htmlEntityDescPtr if found, NULL otherwise.

htmlEntityValueLookup ()

const htmlEntityDesc *	htmlEntityValueLookup	(unsigned int value)

Lookup the given entity in EntitiesTable TODO: the linear scan is really ugly, an hash table is really needed.

value:the entity's unicode value
Returns:the associated htmlEntityDescPtr if found, NULL otherwise.

htmlFreeParserCtxt ()

void	htmlFreeParserCtxt		(htmlParserCtxtPtr ctxt)

Free all the memory used by a parser context. However the parsed document in ctxt->myDoc is not freed.

ctxt:an HTML parser context


htmlIsAutoClosed ()

int	htmlIsAutoClosed		(htmlDocPtr doc, 
htmlNodePtr elem)

The HTML DTD allows a tag to implicitly close other tags. The list is kept in htmlStartClose array. This function checks if a tag is autoclosed by one of it's child

doc:the HTML document
elem:the HTML element
Returns:1 if autoclosed, 0 otherwise

htmlIsScriptAttribute ()

int	htmlIsScriptAttribute		(const xmlChar * name)

Check if an attribute is of content type Script

name:an attribute name
Returns:1 is the attribute is a script 0 otherwise

htmlNewParserCtxt ()

htmlParserCtxtPtr	htmlNewParserCtxt	(void)

Allocate and initialize a new parser context.

Returns:the htmlParserCtxtPtr or NULL in case of allocation error

htmlNodeStatus ()

htmlStatus	htmlNodeStatus		(const htmlNodePtr node, 
int legacy)

Checks whether the tree node is valid. Experimental (the author only uses the HTML enhancements in a SAX parser)

node:an htmlNodePtr in a tree
legacy:whether to allow deprecated elements (YES is faster here for Element nodes)
Returns:for Element nodes, a return from htmlElementAllowedHere (if legacy allowed) or htmlElementStatusHere (otherwise). for Attribute nodes, a return from htmlAttrAllowed for other nodes, HTML_NA (no checks performed)

htmlParseCharRef ()

int	htmlParseCharRef		(htmlParserCtxtPtr ctxt)

parse Reference declarations [66] CharRef ::= '&#' [0-9]+ ';' | '&#x' [0-9a-fA-F]+ ';'

ctxt:an HTML parser context
Returns:the value parsed (as an int)

htmlParseChunk ()

int	htmlParseChunk			(htmlParserCtxtPtr ctxt, 
const char * chunk,
int size,
int terminate)

Parse a Chunk of memory

ctxt:an HTML parser context
chunk:an char array
size:the size in byte of the chunk
terminate:last chunk indicator
Returns:zero if no error, the xmlParserErrors otherwise.

htmlParseDoc ()

htmlDocPtr	htmlParseDoc		(const xmlChar * cur, 
const char * encoding)

parse an HTML in-memory document and build a tree.

cur:a pointer to an array of xmlChar
encoding:a free form C string describing the HTML document encoding, or NULL
Returns:the resulting document tree

htmlParseDocument ()

int	htmlParseDocument		(htmlParserCtxtPtr ctxt)

parse an HTML document (and build a tree if using the standard SAX interface).

ctxt:an HTML parser context
Returns:0, -1 in case of error. the parser context is augmented as a result of the parsing.

htmlParseElement ()

void	htmlParseElement		(htmlParserCtxtPtr ctxt)

parse an HTML element, this is highly recursive this is kept for compatibility with previous code versions [39] element ::= EmptyElemTag | STag content ETag [41] Attribute ::= Name Eq AttValue

ctxt:an HTML parser context

htmlParseEntityRef ()

const htmlEntityDesc *	htmlParseEntityRef	(htmlParserCtxtPtr ctxt, 
const xmlChar ** str)

parse an HTML ENTITY references [68] EntityRef ::= '&' Name ';'

ctxt:an HTML parser context
str:location to store the entity name
Returns:the associated htmlEntityDescPtr if found, or NULL otherwise, if non-NULL *str will have to be freed by the caller.

htmlParseFile ()

htmlDocPtr	htmlParseFile		(const char * filename, 
const char * encoding)

parse an HTML file and build a tree. Automatic support for ZLIB/Compress compressed document is provided by default if found at compile-time.

filename:the filename
encoding:a free form C string describing the HTML document encoding, or NULL
Returns:the resulting document tree

htmlReadDoc ()

htmlDocPtr	htmlReadDoc		(const xmlChar * cur, 
const char * URL,
const char * encoding,
int options)

parse an XML in-memory document and build a tree.

cur:a pointer to a zero terminated string
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlReadFd ()

htmlDocPtr	htmlReadFd		(int fd, 
const char * URL,
const char * encoding,
int options)

parse an XML from a file descriptor and build a tree.

fd:an open file descriptor
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlReadFile ()

htmlDocPtr	htmlReadFile		(const char * filename, 
const char * encoding,
int options)

parse an XML file from the filesystem or the network.

filename:a file or URL
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlReadIO ()

htmlDocPtr	htmlReadIO		(xmlInputReadCallback ioread, 
xmlInputCloseCallback ioclose,
void * ioctx,
const char * URL,
const char * encoding,
int options)

parse an HTML document from I/O functions and source and build a tree.

ioread:an I/O read function
ioclose:an I/O close function
ioctx:an I/O handler
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlReadMemory ()

htmlDocPtr	htmlReadMemory		(const char * buffer, 
int size,
const char * URL,
const char * encoding,
int options)

parse an XML in-memory document and build a tree.

buffer:a pointer to a char array
size:the size of the array
URL:the base URL to use for the document
encoding:the document encoding, or NULL
options:a combination of htmlParserOption(s)
Returns:the resulting document tree

htmlSAXParseDoc ()

htmlDocPtr	htmlSAXParseDoc		(const xmlChar * cur, 
const char * encoding,
htmlSAXHandlerPtr sax,
void * userData)

Parse an HTML in-memory document. If sax is not NULL, use the SAX callbacks to handle parse events. If sax is NULL, fallback to the default DOM behavior and return a tree.

cur:a pointer to an array of xmlChar
encoding:a free form C string describing the HTML document encoding, or NULL
sax:the SAX handler block
userData:if using SAX, this pointer will be provided on callbacks.
Returns:the resulting document tree unless SAX is NULL or the document is not well formed.

htmlSAXParseFile ()

htmlDocPtr	htmlSAXParseFile	(const char * filename, 
const char * encoding,
htmlSAXHandlerPtr sax,
void * userData)

parse an HTML file and build a tree. Automatic support for ZLIB/Compress compressed document is provided by default if found at compile-time. It use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines.

filename:the filename
encoding:a free form C string describing the HTML document encoding, or NULL
sax:the SAX handler block
userData:if using SAX, this pointer will be provided on callbacks.
Returns:the resulting document tree unless SAX is NULL or the document is not well formed.

htmlTagLookup ()

const htmlElemDesc *	htmlTagLookup	(const xmlChar * tag)

Lookup the HTML tag in the ElementTable

tag:The tag name in lowercase
Returns:the related htmlElemDescPtr or NULL if not found.

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