'\"
'\" Generated from expatapi.xml
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'\" BEGIN man.macros
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'\" END man.macros
.TH expatapi 3 "" Tcl ""
.BS
.SH NAME
CheckExpatParserObj, CHandlerSetInstall, CHandlerSetRemove,
CHandlerSetCreate, CHandlerSetGetUserData, GetExpatInfo \- Functions to create, install and remove expat parser object
extensions.
.SH SYNOPSIS
.nf
#include <tclexpat.h>

int 
\&\fBCheckExpatParserObj\fP (\fIinterp\fR, \fInameObj\fR)  

int
\&\fBCHandlerSetInstall\fP (\fIinterp\fR, \fIexpatObj\fR, \fIhandlerSet\fR)

int 
\&\fBCHandlerSetRemove\fP (\fIinterp\fR, \fIexpatObj\fR, \fIhandlerSetName\fR)

CHandlerSet*
\&\fBCHandlerSetCreate\fP (\fIhandlerSetName\fR)

CHandlerSet*
\&\fBCHandlerSetGet\fP (\fIinterp\fR, \fIexpatObj\fR, \fIhandlerSetName\fR)

void*
\&\fBCHandlerSetGetUserData\fP (\fIinterp\fR, \fIexpatObj\fR, \fIhandlerSetName\fR)

TclGenExpatInfo*
\&\fBGetExpatInfo\fP (\fIinterp\fR, \fIexpatObj\fR)

.fi
.SH ARGUMENTS
.AS "unsigned long" clientData
.AP Tcl_Interp "*interp" in
Interpreter with the expat parser object.
.AP Tcl_Obj "*expatObj" in
A Tcl Object containing the command name of the expat parser object to be queried or modified.
.AP char "*handlerSetName" in
Identifier of the handler set.
.AP CHandlerSet "*handlerSet" in
Pointer to a C handler set.
.AP Tcl_Obj "*nameObj" ""
A Tcl Object containing the name of a expat parser object
.BE
.SH DESCRIPTION
.PP
The functions described in this manual allows one to add C level coded event
handler to an tDOM Tcl expat parser objects. A tDOM Tcl expat parser object is
able to have several Tcl scripts and C functions associated with an specific
event. If the event occurs, first the Tcl scripts then the C functions
associated with the event are called in turn.
.PP
A tDOM Tcl expat parser extension is an ordinary Tcl extension and loaded
like every other Tcl extension. It must install at least one new Tcl Level
command, that manipulates a tDOM Tcl expat parser object.
.PP
A C level handler set is a data structure like this:
.CS

typedef struct CHandlerSet {
    struct CHandlerSet *nextHandlerSet;
    char *name;                     /* refname of the handler set */
    int ignoreWhiteCDATAs;          /* ignore 'white' CDATA sections */

    void *userData;                 /* Handler set specific Data Structure;
                                       the C handler set extension has to
                                       malloc the needed structure in his
                                       init func and has to provide a
                                       cleanup func (to free it). */

    CHandlerSet_userDataReset        resetProc;
    CHandlerSet_userDataFree         freeProc;

    /* C func for element start */
    XML_StartElementHandler          elementstartcommand;
    /* C func for element end */
    XML_EndElementHandler            elementendcommand;
    /* C func for character data */
    XML_CharacterDataHandler         datacommand;
    /* C func for namespace decl start */
    XML_StartNamespaceDeclHandler    startnsdeclcommand;
    /* C func for namespace decl end */
    XML_EndNamespaceDeclHandler      endnsdeclcommand;
    /* C func for processing instruction */
    XML_ProcessingInstructionHandler picommand;
    /* C func for default data */
    XML_DefaultHandler               defaultcommand;
    /* C func for unparsed entity declaration */
    XML_NotationDeclHandler          notationcommand;
    /* C func for external entity */
    XML_ExternalEntityRefHandler     externalentitycommand;
    /* C func for unknown encoding */
    XML_UnknownEncodingHandler       unknownencodingcommand;
    /* C func for comments */
    XML_CommentHandler               commentCommand;
    /* C func for "not standalone" docs */
    XML_NotStandaloneHandler         notStandaloneCommand;
    /* C func for CDATA section start */
    XML_StartCdataSectionHandler     startCdataSectionCommand;
    /* C func for CDATA section end */
    XML_EndCdataSectionHandler       endCdataSectionCommand;
    /* C func for !ELEMENT decl's */
    XML_ElementDeclHandler           elementDeclCommand;
    /* C func for !ATTLIST decl's */
    XML_AttlistDeclHandler           attlistDeclCommand;
    /* C func for !DOCTYPE decl's */
    XML_StartDoctypeDeclHandler      startDoctypeDeclCommand;
    /* C func for !DOCTYPE decl ends */
    XML_EndDoctypeDeclHandler        endDoctypeDeclCommand;
    /* C func for !ENTITY decls's */
    XML_EntityDeclHandler            entityDeclCommand;
} CHandlerSet;

.CE
.PP
The types and the arguments of the event functions (XML_*) are exactly
the same like the expat lib handler functions and described in detail in
expat.h, see there. The extension has only to provided the handler functions
needed; it's perfectly OK to leave unused handler slots as the are (they are
initialized to NULL by CHandlerSetCreate).
.PP
The \fIname\fR of this structure is used to identify the handler set.
.PP
If the flag \fIignoreWhiteCDATAs\fR is set, element content which
contain only whitespace isn't reported with the datacommand.
.PP
The \fIuserData\fR element points to the handler set specific data. The
event handler functions are called with this pointer as userData argument.
.PP
\&\fIresetProc\fR and \fIfreeProc\fR must have arguments that match the
type
.CS
void (Tcl_Interp *interp, void *userData)
.CE
.PP
\&\fIresetProc\fR is called in case the parser is reset with
\&\fB<parserObj> reset\fR and should do any necessary cleanup and
reinitializing to prepare the C handler set for a new XML document. The
\&\fIfreeProc\fR is called, if the parser is deleted and should do memory
cleanup etc.
.PP
\&\fICHandlerSetCreate\fR create a C handler set, gives it the name
\&\fIname\fR and initializes any other element with NULL.
.PP
\&\fICHandlerSetInstall\fR adds the \fIhandlerSet\fR to the parser
\&\fIexpatObj\fR. The parser has to be a tDOM Tcl expat parser object in the
interpreter \fIinterp\fR. The name of the C handler set has to be unique for
the parser. Returns 0 in case of success. Returns 1 if \fIexpatObj\fR isn't a
parser object in the interpreter \fIinterp\fR. Returns 2 if this parser has
already a C handler set with the handlerSet name.
.PP
\&\fICHandlerSetRemove\fR removes the C handler set referenced by the
\&\fIhandlerSetName\fR from the parser \fIexpatObj\fR. The parser has to be a
tDOM Tcl expat parser object in the interpreter
\&\fIinterp\fR. \fICHandlerSetRemove\fR calls the freeProc function of the C
handler set structure, removes the handler set from the C handler set list and
frees the handler structure. Returns 0 in case of success. Returns 1 if
\&\fIexpatObj\fR isn't a parser object in the interpreter \fIinterp\fR. Returns
2 if this parser hasn't a C handler set named \fIhandlerSetName\fR.
.PP
\&\fICheckExpatParserObj\fR returns 1, if \fInameObj\fR is a tDOM Tcl expat
parser object in the interpreter \fIinterp\fR, otherwise it returns
0. Example:
.CS

int
TclExampleObjCmd(dummy, interp, objc, objv)
     ClientData dummy;
     Tcl_Interp *interp;
     int objc;
     Tcl_Obj *const objv[];
{
    char          *method;
    CHandlerSet   *handlerSet;
    int            methodIndex, result;
    simpleCounter *counter;
    

    static char *exampleMethods[] = {
        "enable", "getresult", "remove",
        NULL
    };
    enum exampleMethod {
        m_enable, m_getresult, m_remove
    };

    if (objc != 3) {
        Tcl_WrongNumArgs (interp, 1, objv, example_usage);
        return TCL_ERROR;
    }

    if (!CheckExpatParserObj (interp, objv[1])) {
        Tcl_SetResult (interp, "First argument has to be a expat parser object", NULL);
        return TCL_ERROR;
    }
    /* ... */

.CE
.PP
\&\fICHandlerSetGet\fR returns a pointer to the C handler Set referenced
by the name \fIhandlerSetName\fR of the parser object
\&\fIexpatObj\fR. \fIexpatObj\fR has to be an expat parser object in the
interpreter \fIinterp\fR. Returns NULL in case of error.
.PP
\&\fICHandlerSetGetUserData\fR returns a pointer to the userData of the C
handler set referenced by the name \fIhandlerSetName\fR of the parser object
\&\fIexpatObj\fR. \fIexpatObj\fR has to be an expat parser object in the
interpreter \fIinterp\fR. Returns NULL in case of error.
.PP
\&\fIGetExpatInfo\fR Is a helper function that returns a pointer to the
TclGenExpatInfo structure of the tDOM Tcl expat parser object
\&\fIexpatObj\fR. The \fIexpatObj\fR has to be a tDOM Tcl expat parser object
in the interpreter \fIinterp\fR. This is most useful, to set the application
status of the parser object.
.PP
See the simple but full functionally example in the extensions/example
dir or the more complex example tnc in the extensions/tnc dir (a simple DTD
validation extension).
.SH "SEE ALSO"
expat
.SH KEYWORDS
C handler set
