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# HTMLparser

## Name

HTMLparser --

## Synopsis

    typedef     htmlParserCtxt;
    typedef     htmlParserCtxtPtr;
    typedef     htmlParserNodeInfo;
    typedef     htmlSAXHandler;
    typedef     htmlSAXHandlerPtr;
    typedef     htmlParserInput;
    typedef     htmlParserInputPtr;
    typedef     htmlDocPtr;
    typedef     htmlNodePtr;
    struct      htmlElemDesc;
    typedef     htmlElemDescPtr;
    struct      htmlEntityDesc;
    typedef     htmlEntityDescPtr;
    const htmlElemDesc* htmlTagLookup           (const xmlChar *tag);
    const htmlEntityDesc* htmlEntityLookup      (const xmlChar *name);
    const htmlEntityDesc* htmlEntityValueLookup (unsigned int value);
    int         htmlIsAutoClosed                (htmlDocPtr doc,
                                                 htmlNodePtr elem);
    int         htmlAutoCloseTag                (htmlDocPtr doc,
                                                 const xmlChar *name,
                                                 htmlNodePtr elem);
    const htmlEntityDesc* htmlParseEntityRef    (htmlParserCtxtPtr ctxt,
                                                 xmlChar **str);
    int         htmlParseCharRef                (htmlParserCtxtPtr ctxt);
    void        htmlParseElement                (htmlParserCtxtPtr ctxt);
    int         htmlParseDocument               (htmlParserCtxtPtr ctxt);
    htmlDocPtr  htmlSAXParseDoc                 (xmlChar *cur,
                                                 const char *encoding,
                                                 htmlSAXHandlerPtr sax,
                                                 void *userData);
    htmlDocPtr  htmlParseDoc                    (xmlChar *cur,
                                                 const char *encoding);
    htmlDocPtr  htmlSAXParseFile                (const char *filename,
                                                 const char *encoding,
                                                 htmlSAXHandlerPtr sax,
                                                 void *userData);
    htmlDocPtr  htmlParseFile                   (const char *filename,
                                                 const char *encoding);
    int         UTF8ToHtml                      (unsigned char *out,
                                                 int *outlen,
                                                 unsigned char *in,
                                                 int *inlen);
    int         htmlEncodeEntities              (unsigned char *out,
                                                 int *outlen,
                                                 unsigned char *in,
                                                 int *inlen,
                                                 int quoteChar);
    int         htmlIsScriptAttribute           (const xmlChar *name);
    int         htmlHandleOmittedElem           (int val);
    void        htmlFreeParserCtxt              (htmlParserCtxtPtr ctxt);
    htmlParserCtxtPtr htmlCreatePushParserCtxt  (htmlSAXHandlerPtr sax,
                                                 void *user_data,
                                                 const char *chunk,
                                                 int size,
                                                 const char *filename,
                                                 xmlCharEncoding enc);
    int         htmlParseChunk                  (htmlParserCtxtPtr ctxt,
                                                 const char *chunk,
                                                 int size,
                                                 int terminate);

## Description

## Details

### htmlParserCtxt

    typedef xmlParserCtxt htmlParserCtxt;

### htmlParserCtxtPtr

    typedef xmlParserCtxtPtr htmlParserCtxtPtr;

### htmlParserNodeInfo

    typedef xmlParserNodeInfo htmlParserNodeInfo;

### htmlSAXHandler

    typedef xmlSAXHandler htmlSAXHandler;

### htmlSAXHandlerPtr

    typedef xmlSAXHandlerPtr htmlSAXHandlerPtr;

### htmlParserInput

    typedef xmlParserInput htmlParserInput;

### htmlParserInputPtr

    typedef xmlParserInputPtr htmlParserInputPtr;

### htmlDocPtr

    typedef xmlDocPtr htmlDocPtr;

### htmlNodePtr

    typedef xmlNodePtr htmlNodePtr;

### struct 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 */
    };

### htmlElemDescPtr

    typedef htmlElemDesc *htmlElemDescPtr;

### struct htmlEntityDesc

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

### htmlEntityDescPtr

    typedef htmlEntityDesc *htmlEntityDescPtr;

### 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.

### 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.

### 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

### 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

### htmlParseEntityRef ()

    const htmlEntityDesc* htmlParseEntityRef    (htmlParserCtxtPtr ctxt,
                                                 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.

### 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)

### htmlParseElement ()

    void        htmlParseElement                (htmlParserCtxtPtr ctxt);

parse an HTML element, this is highly recursive

[39] element ::= EmptyElemTag | STag content ETag

[41] Attribute ::= Name Eq AttValue

`ctxt` : | an HTML parser context

### 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.

### htmlSAXParseDoc ()

    htmlDocPtr  htmlSAXParseDoc                 (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.

### htmlParseDoc ()

    htmlDocPtr  htmlParseDoc                    (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

### 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.

### 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

### UTF8ToHtml ()

    int         UTF8ToHtml                      (unsigned char *out,
                                                 int *outlen,
                                                 unsigned char *in,
                                                 int *inlen);

Take a block of UTF-8 chars in and try to convert it to an ASCII plus HTML entities block of chars out.

`out` : | a pointer to an array of bytes to store the result
`outlen` : | the length of `out`
`in` : | a pointer to an array of UTF-8 chars
`inlen` : | the length of `in`
Returns : | 0 if success, -2 if the transcoding fails, or -1 otherwise The value of `inlen` after return is the number of octets consumed as the return value is positive, else unpredictable. The value of `outlen` after return is the number of octets consumed.

### htmlEncodeEntities ()

    int         htmlEncodeEntities              (unsigned char *out,
                                                 int *outlen,
                                                 unsigned char *in,
                                                 int *inlen,
                                                 int quoteChar);

Take a block of UTF-8 chars in and try to convert it to an ASCII plus HTML entities block of chars out.

`out` : | a pointer to an array of bytes to store the result
`outlen` : | the length of `out`
`in` : | a pointer to an array of UTF-8 chars
`inlen` : | the length of `in`
`quoteChar` : | the quote character to escape (' or ") or zero.
Returns : | 0 if success, -2 if the transcoding fails, or -1 otherwise The value of `inlen` after return is the number of octets consumed as the return value is positive, else unpredictable. The value of `outlen` after return is the number of octets consumed.

### 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

### htmlHandleOmittedElem ()

    int         htmlHandleOmittedElem           (int val);

Set and return the previous value for handling HTML omitted tags.

`val` : | int 0 or 1
Returns : | the last value for 0 for no handling, 1 for auto insertion.

### 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

### 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 To allow content encoding detection, `size` should be >= 4 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

### htmlParseChunk ()

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

Parse a Chunk of memory

`ctxt` : | an XML 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.

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