Module HTMLtree from libxml2

# ## Module HTMLtree from libxml2

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this module implements a few function needed to process tree in an HTML specific way. ## Table of Contents
    #define HTML_COMMENT_NODE
    #define HTML_ENTITY_REF_NODE
    #define HTML_PI_NODE
    #define HTML_PRESERVE_NODE
    #define HTML_TEXT_NODE
    void	htmlDocContentDumpFormatOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr cur,
    					 const char * encoding,
    					 int format)
    void	htmlDocContentDumpOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr cur,
    					 const char * encoding)
    int	htmlDocDump			(FILE * f,
    					 xmlDocPtr cur)
    void	htmlDocDumpMemory		(xmlDocPtr cur,
    					 xmlChar ** mem,
    					 int * size)
    const xmlChar *	htmlGetMetaEncoding	(htmlDocPtr doc)
    int	htmlIsBooleanAttr		(const xmlChar * name)
    htmlDocPtr	htmlNewDoc		(const xmlChar * URI,
    					 const xmlChar * ExternalID)
    htmlDocPtr	htmlNewDocNoDtD		(const xmlChar * URI,
    					 const xmlChar * ExternalID)
    int	htmlNodeDump			(xmlBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur)
    void	htmlNodeDumpFile		(FILE * out,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur)
    int	htmlNodeDumpFileFormat		(FILE * out,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding,
    					 int format)
    void	htmlNodeDumpFormatOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding,
    					 int format)
    void	htmlNodeDumpOutput		(xmlOutputBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding)
    int	htmlSaveFile			(const char * filename,
    					 xmlDocPtr cur)
    int	htmlSaveFileEnc			(const char * filename,
    					 xmlDocPtr cur,
    					 const char * encoding)
    int	htmlSaveFileFormat		(const char * filename,
    					 xmlDocPtr cur,
    					 const char * encoding,
    					 int format)
    int	htmlSetMetaEncoding		(htmlDocPtr doc,
    					 const xmlChar * encoding)
## Description ### Macro: HTML_COMMENT_NODE
    #define HTML_COMMENT_NODE
Macro. A comment in a HTML document is really implemented the same way as a comment in an XML document. ### Macro: HTML_ENTITY_REF_NODE
    #define HTML_ENTITY_REF_NODE
Macro. An entity reference in a HTML document is really implemented the same way as an entity reference in an XML document. ### Macro: HTML_PI_NODE
    #define HTML_PI_NODE
Macro. A processing instruction in a HTML document is really implemented the same way as a processing instruction in an XML document. ### Macro: HTML_PRESERVE_NODE
    #define HTML_PRESERVE_NODE
Macro. A preserved node in a HTML document is really implemented the same way as a CDATA section in an XML document. ### Macro: HTML_TEXT_NODE
    #define HTML_TEXT_NODE
Macro. A text node in a HTML document is really implemented the same way as a text node in an XML document. ### Function: htmlDocContentDumpFormatOutput
    void	htmlDocContentDumpFormatOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr cur,
    					 const char * encoding,
    					 int format)
Dump an HTML document.
`buf`: | the HTML buffer output
`cur`: | the document
`encoding`: | the encoding string
`format`: | should formatting spaces been added
### Function: htmlDocContentDumpOutput
    void	htmlDocContentDumpOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr cur,
    					 const char * encoding)
Dump an HTML document. Formating return/spaces are added.
`buf`: | the HTML buffer output
`cur`: | the document
`encoding`: | the encoding string
### Function: htmlDocDump
    int	htmlDocDump			(FILE * f,
    					 xmlDocPtr cur)
Dump an HTML document to an open FILE.
`f`: | the FILE*
`cur`: | the document
`Returns`: | the number of byte written or -1 in case of failure.
### Function: htmlDocDumpMemory
    void	htmlDocDumpMemory		(xmlDocPtr cur,
    					 xmlChar ** mem,
    					 int * size)
Dump an HTML document in memory and return the xmlChar * and it's size. It's up to the caller to free the memory.
`cur`: | the document
`mem`: | OUT: the memory pointer
`size`: | OUT: the memory length
### Function: htmlGetMetaEncoding
    const xmlChar *	htmlGetMetaEncoding	(htmlDocPtr doc)
Encoding definition lookup in the Meta tags
`doc`: | the document
`Returns`: | the current encoding as flagged in the HTML source
### Function: htmlIsBooleanAttr
    int	htmlIsBooleanAttr		(const xmlChar * name)
Determine if a given attribute is a boolean attribute.
`name`: | the name of the attribute to check
`Returns`: | false if the attribute is not boolean, true otherwise.
### Function: htmlNewDoc
    htmlDocPtr	htmlNewDoc		(const xmlChar * URI,
    					 const xmlChar * ExternalID)
Creates a new HTML document
`URI`: | URI for the dtd, or NULL
`ExternalID`: | the external ID of the DTD, or NULL
`Returns`: | a new document
### Function: htmlNewDocNoDtD
    htmlDocPtr	htmlNewDocNoDtD		(const xmlChar * URI,
    					 const xmlChar * ExternalID)
Creates a new HTML document without a DTD node if @URI and @ExternalID are NULL
`URI`: | URI for the dtd, or NULL
`ExternalID`: | the external ID of the DTD, or NULL
`Returns`: | a new document, do not initialize the DTD if not provided
### Function: htmlNodeDump
    int	htmlNodeDump			(xmlBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur)
Dump an HTML node, recursive behaviour,children are printed too, and formatting returns are added.
`buf`: | the HTML buffer output
`doc`: | the document
`cur`: | the current node
`Returns`: | the number of byte written or -1 in case of error
### Function: htmlNodeDumpFile
    void	htmlNodeDumpFile		(FILE * out,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur)
Dump an HTML node, recursive behaviour,children are printed too, and formatting returns are added.
`out`: | the FILE pointer
`doc`: | the document
`cur`: | the current node
### Function: htmlNodeDumpFileFormat
    int	htmlNodeDumpFileFormat		(FILE * out,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding,
    					 int format)
Dump an HTML node, recursive behaviour,children are printed too. TODO: if encoding == NULL try to save in the doc encoding
`out`: | the FILE pointer
`doc`: | the document
`cur`: | the current node
`encoding`: | the document encoding
`format`: | should formatting spaces been added
`Returns`: | the number of byte written or -1 in case of failure.
### Function: htmlNodeDumpFormatOutput
    void	htmlNodeDumpFormatOutput	(xmlOutputBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding,
    					 int format)
Dump an HTML node, recursive behaviour,children are printed too.
`buf`: | the HTML buffer output
`doc`: | the document
`cur`: | the current node
`encoding`: | the encoding string
`format`: | should formatting spaces been added
### Function: htmlNodeDumpOutput
    void	htmlNodeDumpOutput		(xmlOutputBufferPtr buf,
    					 xmlDocPtr doc,
    					 xmlNodePtr cur,
    					 const char * encoding)
Dump an HTML node, recursive behaviour,children are printed too, and formatting returns/spaces are added.
`buf`: | the HTML buffer output
`doc`: | the document
`cur`: | the current node
`encoding`: | the encoding string
### Function: htmlSaveFile
    int	htmlSaveFile			(const char * filename,
    					 xmlDocPtr cur)
Dump an HTML document to a file. If @filename is "-" the stdout file is used.
`filename`: | the filename (or URL)
`cur`: | the document
`Returns`: | the number of byte written or -1 in case of failure.
### Function: htmlSaveFileEnc
    int	htmlSaveFileEnc			(const char * filename,
    					 xmlDocPtr cur,
    					 const char * encoding)
Dump an HTML document to a file using a given encoding and formatting returns/spaces are added.
`filename`: | the filename
`cur`: | the document
`encoding`: | the document encoding
`Returns`: | the number of byte written or -1 in case of failure.
### Function: htmlSaveFileFormat
    int	htmlSaveFileFormat		(const char * filename,
    					 xmlDocPtr cur,
    					 const char * encoding,
    					 int format)
Dump an HTML document to a file using a given encoding.
`filename`: | the filename
`cur`: | the document
`encoding`: | the document encoding
`format`: | should formatting spaces been added
`Returns`: | the number of byte written or -1 in case of failure.
### Function: htmlSetMetaEncoding
    int	htmlSetMetaEncoding		(htmlDocPtr doc,
    					 const xmlChar * encoding)
Sets the current encoding in the Meta tags NOTE: this will not change the document content encoding, just the META flag associated.
`doc`: | the document
`encoding`: | the encoding string
`Returns`: | 0 in case of success and -1 in case of error
Daniel Veillard