src/protocols/jabber/xmlrole.c

/*
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
License for the specific language governing rights and limitations
under the License.

The Original Code is expat.

The Initial Developer of the Original Code is James Clark.
Portions created by James Clark are Copyright (C) 1998, 1999
James Clark. All Rights Reserved.

Contributor(s):

*/

#include "xmldef.h"
#include "xmlrole.h"

/* Doesn't check:

 that ,| are not mixed in a model group
 content of literals

*/

#ifndef MIN_BYTES_PER_CHAR
#define MIN_BYTES_PER_CHAR(enc) ((enc)->minBytesPerChar)
#endif

typedef int PROLOG_HANDLER(struct prolog_state *state,
                           int tok,
                           const char *ptr,
                           const char *end,
                           const ENCODING *enc);

static PROLOG_HANDLER
prolog0, prolog1, prolog2,
doctype0, doctype1, doctype2, doctype3, doctype4, doctype5,
internalSubset,
entity0, entity1, entity2, entity3, entity4, entity5, entity6,
entity7, entity8, entity9,
notation0, notation1, notation2, notation3, notation4,
attlist0, attlist1, attlist2, attlist3, attlist4, attlist5, attlist6,
attlist7, attlist8, attlist9,
element0, element1, element2, element3, element4, element5, element6,
element7,
declClose,
error;

static
int syntaxError(PROLOG_STATE *);

static
int prolog0(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        state->handler = prolog1;
        return XML_ROLE_NONE;
    case XML_TOK_XML_DECL:
        state->handler = prolog1;
        return XML_ROLE_XML_DECL;
    case XML_TOK_PI:
        state->handler = prolog1;
        return XML_ROLE_NONE;
    case XML_TOK_COMMENT:
        state->handler = prolog1;
    case XML_TOK_BOM:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_OPEN:
        if (!XmlNameMatchesAscii(enc,
                                 ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                 "DOCTYPE"))
            break;
        state->handler = doctype0;
        return XML_ROLE_NONE;
    case XML_TOK_INSTANCE_START:
        state->handler = error;
        return XML_ROLE_INSTANCE_START;
    }
    return syntaxError(state);
}

static
int prolog1(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_PI:
    case XML_TOK_COMMENT:
    case XML_TOK_BOM:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_OPEN:
        if (!XmlNameMatchesAscii(enc,
                                 ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                 "DOCTYPE"))
            break;
        state->handler = doctype0;
        return XML_ROLE_NONE;
    case XML_TOK_INSTANCE_START:
        state->handler = error;
        return XML_ROLE_INSTANCE_START;
    }
    return syntaxError(state);
}

static
int prolog2(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_PI:
    case XML_TOK_COMMENT:
        return XML_ROLE_NONE;
    case XML_TOK_INSTANCE_START:
        state->handler = error;
        return XML_ROLE_INSTANCE_START;
    }
    return syntaxError(state);
}

static
int doctype0(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = doctype1;
        return XML_ROLE_DOCTYPE_NAME;
    }
    return syntaxError(state);
}

static
int doctype1(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_OPEN_BRACKET:
        state->handler = internalSubset;
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = prolog2;
        return XML_ROLE_DOCTYPE_CLOSE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "SYSTEM")) {
            state->handler = doctype3;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc, ptr, "PUBLIC")) {
            state->handler = doctype2;
            return XML_ROLE_NONE;
        }
        break;
    }
    return syntaxError(state);
}

static
int doctype2(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = doctype3;
        return XML_ROLE_DOCTYPE_PUBLIC_ID;
    }
    return syntaxError(state);
}

static
int doctype3(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = doctype4;
        return XML_ROLE_DOCTYPE_SYSTEM_ID;
    }
    return syntaxError(state);
}

static
int doctype4(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_OPEN_BRACKET:
        state->handler = internalSubset;
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = prolog2;
        return XML_ROLE_DOCTYPE_CLOSE;
    }
    return syntaxError(state);
}

static
int doctype5(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = prolog2;
        return XML_ROLE_DOCTYPE_CLOSE;
    }
    return syntaxError(state);
}

static
int internalSubset(PROLOG_STATE *state,
                   int tok,
                   const char *ptr,
                   const char *end,
                   const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_OPEN:
        if (XmlNameMatchesAscii(enc,
                                ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                "ENTITY")) {
            state->handler = entity0;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc,
                                ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                "ATTLIST")) {
            state->handler = attlist0;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc,
                                ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                "ELEMENT")) {
            state->handler = element0;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc,
                                ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                                "NOTATION")) {
            state->handler = notation0;
            return XML_ROLE_NONE;
        }
        break;
    case XML_TOK_PI:
    case XML_TOK_COMMENT:
        return XML_ROLE_NONE;
    case XML_TOK_PARAM_ENTITY_REF:
        return XML_ROLE_PARAM_ENTITY_REF;
    case XML_TOK_CLOSE_BRACKET:
        state->handler = doctype5;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

static
int entity0(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_PERCENT:
        state->handler = entity1;
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        state->handler = entity2;
        return XML_ROLE_GENERAL_ENTITY_NAME;
    }
    return syntaxError(state);
}

static
int entity1(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        state->handler = entity7;
        return XML_ROLE_PARAM_ENTITY_NAME;
    }
    return syntaxError(state);
}

static
int entity2(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "SYSTEM")) {
            state->handler = entity4;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc, ptr, "PUBLIC")) {
            state->handler = entity3;
            return XML_ROLE_NONE;
        }
        break;
    case XML_TOK_LITERAL:
        state->handler = declClose;
        return XML_ROLE_ENTITY_VALUE;
    }
    return syntaxError(state);
}

static
int entity3(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = entity4;
        return XML_ROLE_ENTITY_PUBLIC_ID;
    }
    return syntaxError(state);
}


static
int entity4(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = entity5;
        return XML_ROLE_ENTITY_SYSTEM_ID;
    }
    return syntaxError(state);
}

static
int entity5(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = internalSubset;
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "NDATA")) {
            state->handler = entity6;
            return XML_ROLE_NONE;
        }
        break;
    }
    return syntaxError(state);
}

static
int entity6(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        state->handler = declClose;
        return XML_ROLE_ENTITY_NOTATION_NAME;
    }
    return syntaxError(state);
}

static
int entity7(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "SYSTEM")) {
            state->handler = entity9;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc, ptr, "PUBLIC")) {
            state->handler = entity8;
            return XML_ROLE_NONE;
        }
        break;
    case XML_TOK_LITERAL:
        state->handler = declClose;
        return XML_ROLE_ENTITY_VALUE;
    }
    return syntaxError(state);
}

static
int entity8(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = entity9;
        return XML_ROLE_ENTITY_PUBLIC_ID;
    }
    return syntaxError(state);
}

static
int entity9(PROLOG_STATE *state,
            int tok,
            const char *ptr,
            const char *end,
            const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = declClose;
        return XML_ROLE_ENTITY_SYSTEM_ID;
    }
    return syntaxError(state);
}

static
int notation0(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        state->handler = notation1;
        return XML_ROLE_NOTATION_NAME;
    }
    return syntaxError(state);
}

static
int notation1(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "SYSTEM")) {
            state->handler = notation3;
            return XML_ROLE_NONE;
        }
        if (XmlNameMatchesAscii(enc, ptr, "PUBLIC")) {
            state->handler = notation2;
            return XML_ROLE_NONE;
        }
        break;
    }
    return syntaxError(state);
}

static
int notation2(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = notation4;
        return XML_ROLE_NOTATION_PUBLIC_ID;
    }
    return syntaxError(state);
}

static
int notation3(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = declClose;
        return XML_ROLE_NOTATION_SYSTEM_ID;
    }
    return syntaxError(state);
}

static
int notation4(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = declClose;
        return XML_ROLE_NOTATION_SYSTEM_ID;
    case XML_TOK_DECL_CLOSE:
        state->handler = internalSubset;
        return XML_ROLE_NOTATION_NO_SYSTEM_ID;
    }
    return syntaxError(state);
}

static
int attlist0(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = attlist1;
        return XML_ROLE_ATTLIST_ELEMENT_NAME;
    }
    return syntaxError(state);
}

static
int attlist1(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = internalSubset;
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = attlist2;
        return XML_ROLE_ATTRIBUTE_NAME;
    }
    return syntaxError(state);
}

static
int attlist2(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        {
            static const char *types[] = {
                "CDATA",
                "ID",
                "IDREF",
                "IDREFS",
                "ENTITY",
                "ENTITIES",
                "NMTOKEN",
                "NMTOKENS",
            };
            int i;
            for (i = 0; i < (int)(sizeof(types)/sizeof(types[0])); i++)
                if (XmlNameMatchesAscii(enc, ptr, types[i])) {
                    state->handler = attlist8;
                    return XML_ROLE_ATTRIBUTE_TYPE_CDATA + i;
                }
        }
        if (XmlNameMatchesAscii(enc, ptr, "NOTATION")) {
            state->handler = attlist5;
            return XML_ROLE_NONE;
        }
        break;
    case XML_TOK_OPEN_PAREN:
        state->handler = attlist3;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

static
int attlist3(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NMTOKEN:
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = attlist4;
        return XML_ROLE_ATTRIBUTE_ENUM_VALUE;
    }
    return syntaxError(state);
}

static
int attlist4(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_CLOSE_PAREN:
        state->handler = attlist8;
        return XML_ROLE_NONE;
    case XML_TOK_OR:
        state->handler = attlist3;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

static
int attlist5(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_OPEN_PAREN:
        state->handler = attlist6;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}


static
int attlist6(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        state->handler = attlist7;
        return XML_ROLE_ATTRIBUTE_NOTATION_VALUE;
    }
    return syntaxError(state);
}

static
int attlist7(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_CLOSE_PAREN:
        state->handler = attlist8;
        return XML_ROLE_NONE;
    case XML_TOK_OR:
        state->handler = attlist6;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

/* default value */
static
int attlist8(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_POUND_NAME:
        if (XmlNameMatchesAscii(enc,
                                ptr + MIN_BYTES_PER_CHAR(enc),
                                "IMPLIED")) {
            state->handler = attlist1;
            return XML_ROLE_IMPLIED_ATTRIBUTE_VALUE;
        }
        if (XmlNameMatchesAscii(enc,
                                ptr + MIN_BYTES_PER_CHAR(enc),
                                "REQUIRED")) {
            state->handler = attlist1;
            return XML_ROLE_REQUIRED_ATTRIBUTE_VALUE;
        }
        if (XmlNameMatchesAscii(enc,
                                ptr + MIN_BYTES_PER_CHAR(enc),
                                "FIXED")) {
            state->handler = attlist9;
            return XML_ROLE_NONE;
        }
        break;
    case XML_TOK_LITERAL:
        state->handler = attlist1;
        return XML_ROLE_DEFAULT_ATTRIBUTE_VALUE;
    }
    return syntaxError(state);
}

static
int attlist9(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_LITERAL:
        state->handler = attlist1;
        return XML_ROLE_FIXED_ATTRIBUTE_VALUE;
    }
    return syntaxError(state);
}

static
int element0(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = element1;
        return XML_ROLE_ELEMENT_NAME;
    }
    return syntaxError(state);
}

static
int element1(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
        if (XmlNameMatchesAscii(enc, ptr, "EMPTY")) {
            state->handler = declClose;
            return XML_ROLE_CONTENT_EMPTY;
        }
        if (XmlNameMatchesAscii(enc, ptr, "ANY")) {
            state->handler = declClose;
            return XML_ROLE_CONTENT_ANY;
        }
        break;
    case XML_TOK_OPEN_PAREN:
        state->handler = element2;
        state->level = 1;
        return XML_ROLE_GROUP_OPEN;
    }
    return syntaxError(state);
}

static
int element2(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_POUND_NAME:
        if (XmlNameMatchesAscii(enc,
                                ptr + MIN_BYTES_PER_CHAR(enc),
                                "PCDATA")) {
            state->handler = element3;
            return XML_ROLE_CONTENT_PCDATA;
        }
        break;
    case XML_TOK_OPEN_PAREN:
        state->level = 2;
        state->handler = element6;
        return XML_ROLE_GROUP_OPEN;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT;
    case XML_TOK_NAME_QUESTION:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_OPT;
    case XML_TOK_NAME_ASTERISK:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_REP;
    case XML_TOK_NAME_PLUS:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_PLUS;
    }
    return syntaxError(state);
}

static
int element3(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_CLOSE_PAREN:
    case XML_TOK_CLOSE_PAREN_ASTERISK:
        state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE_REP;
    case XML_TOK_OR:
        state->handler = element4;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

static
int element4(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = element5;
        return XML_ROLE_CONTENT_ELEMENT;
    }
    return syntaxError(state);
}

static
int element5(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_CLOSE_PAREN_ASTERISK:
        state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE_REP;
    case XML_TOK_OR:
        state->handler = element4;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

static
int element6(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_OPEN_PAREN:
        state->level += 1;
        return XML_ROLE_GROUP_OPEN;
    case XML_TOK_NAME:
    case XML_TOK_PREFIXED_NAME:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT;
    case XML_TOK_NAME_QUESTION:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_OPT;
    case XML_TOK_NAME_ASTERISK:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_REP;
    case XML_TOK_NAME_PLUS:
        state->handler = element7;
        return XML_ROLE_CONTENT_ELEMENT_PLUS;
    }
    return syntaxError(state);
}

static
int element7(PROLOG_STATE *state,
             int tok,
             const char *ptr,
             const char *end,
             const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_CLOSE_PAREN:
        state->level -= 1;
        if (state->level == 0)
            state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE;
    case XML_TOK_CLOSE_PAREN_ASTERISK:
        state->level -= 1;
        if (state->level == 0)
            state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE_REP;
    case XML_TOK_CLOSE_PAREN_QUESTION:
        state->level -= 1;
        if (state->level == 0)
            state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE_OPT;
    case XML_TOK_CLOSE_PAREN_PLUS:
        state->level -= 1;
        if (state->level == 0)
            state->handler = declClose;
        return XML_ROLE_GROUP_CLOSE_PLUS;
    case XML_TOK_COMMA:
        state->handler = element6;
        return XML_ROLE_GROUP_SEQUENCE;
    case XML_TOK_OR:
        state->handler = element6;
        return XML_ROLE_GROUP_CHOICE;
    }
    return syntaxError(state);
}

static
int declClose(PROLOG_STATE *state,
              int tok,
              const char *ptr,
              const char *end,
              const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_PROLOG_S:
        return XML_ROLE_NONE;
    case XML_TOK_DECL_CLOSE:
        state->handler = internalSubset;
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}

#if 0

static
int ignore(PROLOG_STATE *state,
           int tok,
           const char *ptr,
           const char *end,
           const ENCODING *enc)
{
    switch (tok) {
    case XML_TOK_DECL_CLOSE:
        state->handler = internalSubset;
        return 0;
    default:
        return XML_ROLE_NONE;
    }
    return syntaxError(state);
}
#endif

static
int error(PROLOG_STATE *state,
          int tok,
          const char *ptr,
          const char *end,
          const ENCODING *enc)
{
    return XML_ROLE_NONE;
}

static
int syntaxError(PROLOG_STATE *state)
{
    state->handler = error;
    return XML_ROLE_ERROR;
}

void XmlPrologStateInit(PROLOG_STATE *state)
{
    state->handler = prolog0;
}