/* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
   See the file COPYING for copying permission.
*/

#include <stddef.h>

#ifdef COMPILED_FROM_DSP
#include "winconfig.h"
#elif defined(MACOS_CLASSIC)
#include "macconfig.h"
#else
#ifdef HAVE_EXPAT_CONFIG_H
#include "expat_config.h"
#endif
#endif /* ndef COMPILED_FROM_DSP */

#include "XML/expat_external.h"
#include "internal.h"
#include "xmlrole.h"
#include "ascii.h"

/* Doesn't check:

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

*/

static const char KW_ANY[] = {
    ASCII_A, ASCII_N, ASCII_Y, '\0' };
static const char KW_ATTLIST[] = {
    ASCII_A, ASCII_T, ASCII_T, ASCII_L, ASCII_I, ASCII_S, ASCII_T, '\0' };
static const char KW_CDATA[] = {
    ASCII_C, ASCII_D, ASCII_A, ASCII_T, ASCII_A, '\0' };
static const char KW_DOCTYPE[] = {
    ASCII_D, ASCII_O, ASCII_C, ASCII_T, ASCII_Y, ASCII_P, ASCII_E, '\0' };
static const char KW_ELEMENT[] = {
    ASCII_E, ASCII_L, ASCII_E, ASCII_M, ASCII_E, ASCII_N, ASCII_T, '\0' };
static const char KW_EMPTY[] = {
    ASCII_E, ASCII_M, ASCII_P, ASCII_T, ASCII_Y, '\0' };
static const char KW_ENTITIES[] = {
    ASCII_E, ASCII_N, ASCII_T, ASCII_I, ASCII_T, ASCII_I, ASCII_E, ASCII_S,
    '\0' };
static const char KW_ENTITY[] = {
    ASCII_E, ASCII_N, ASCII_T, ASCII_I, ASCII_T, ASCII_Y, '\0' };
static const char KW_FIXED[] = {
    ASCII_F, ASCII_I, ASCII_X, ASCII_E, ASCII_D, '\0' };
static const char KW_ID[] = {
    ASCII_I, ASCII_D, '\0' };
static const char KW_IDREF[] = {
    ASCII_I, ASCII_D, ASCII_R, ASCII_E, ASCII_F, '\0' };
static const char KW_IDREFS[] = {
    ASCII_I, ASCII_D, ASCII_R, ASCII_E, ASCII_F, ASCII_S, '\0' };
static const char KW_IGNORE[] = {
    ASCII_I, ASCII_G, ASCII_N, ASCII_O, ASCII_R, ASCII_E, '\0' };
static const char KW_IMPLIED[] = {
    ASCII_I, ASCII_M, ASCII_P, ASCII_L, ASCII_I, ASCII_E, ASCII_D, '\0' };
static const char KW_INCLUDE[] = {
    ASCII_I, ASCII_N, ASCII_C, ASCII_L, ASCII_U, ASCII_D, ASCII_E, '\0' };
static const char KW_NDATA[] = {
    ASCII_N, ASCII_D, ASCII_A, ASCII_T, ASCII_A, '\0' };
static const char KW_NMTOKEN[] = {
    ASCII_N, ASCII_M, ASCII_T, ASCII_O, ASCII_K, ASCII_E, ASCII_N, '\0' };
static const char KW_NMTOKENS[] = {
    ASCII_N, ASCII_M, ASCII_T, ASCII_O, ASCII_K, ASCII_E, ASCII_N, ASCII_S,
    '\0' };
static const char KW_NOTATION[] =
    { ASCII_N, ASCII_O, ASCII_T, ASCII_A, ASCII_T, ASCII_I, ASCII_O, ASCII_N,
      '\0' };
static const char KW_PCDATA[] = {
    ASCII_P, ASCII_C, ASCII_D, ASCII_A, ASCII_T, ASCII_A, '\0' };
static const char KW_PUBLIC[] = {
    ASCII_P, ASCII_U, ASCII_B, ASCII_L, ASCII_I, ASCII_C, '\0' };
static const char KW_REQUIRED[] = {
    ASCII_R, ASCII_E, ASCII_Q, ASCII_U, ASCII_I, ASCII_R, ASCII_E, ASCII_D,
    '\0' };
static const char KW_SYSTEM[] = {
    ASCII_S, ASCII_Y, ASCII_S, ASCII_T, ASCII_E, ASCII_M, '\0' };

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

#ifdef XML_DTD
#define setTopLevel(state) \
  ((state)->handler = ((state)->documentEntity \
                       ? internalSubset \
                       : externalSubset1))
#else /* not XML_DTD */
#define setTopLevel(state) ((state)->handler = internalSubset)
#endif /* not XML_DTD */

typedef int PTRCALL PROLOG_HANDLER(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, entity10,
  notation0, notation1, notation2, notation3, notation4,
  attlist0, attlist1, attlist2, attlist3, attlist4, attlist5, attlist6,
  attlist7, attlist8, attlist9,
  element0, element1, element2, element3, element4, element5, element6,
  element7,
#ifdef XML_DTD
  externalSubset0, externalSubset1,
  condSect0, condSect1, condSect2,
#endif /* XML_DTD */
  declClose,
  error;

static int FASTCALL common(PROLOG_STATE *state, int tok);

static int PTRCALL
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_PI;
  case XML_TOK_COMMENT:
    state->handler = prolog1;
    return XML_ROLE_COMMENT;
  case XML_TOK_BOM:
    return XML_ROLE_NONE;
  case XML_TOK_DECL_OPEN:
    if (!XmlNameMatchesAscii(enc,
                             ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                             end,
                             KW_DOCTYPE))
      break;
    state->handler = doctype0;
    return XML_ROLE_DOCTYPE_NONE;
  case XML_TOK_INSTANCE_START:
    state->handler = error;
    return XML_ROLE_INSTANCE_START;
  }
  return common(state, tok);
}

static int PTRCALL
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:
    return XML_ROLE_PI;
  case XML_TOK_COMMENT:
    return XML_ROLE_COMMENT;
  case XML_TOK_BOM:
    return XML_ROLE_NONE;
  case XML_TOK_DECL_OPEN:
    if (!XmlNameMatchesAscii(enc,
                             ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                             end,
                             KW_DOCTYPE))
      break;
    state->handler = doctype0;
    return XML_ROLE_DOCTYPE_NONE;
  case XML_TOK_INSTANCE_START:
    state->handler = error;
    return XML_ROLE_INSTANCE_START;
  }
  return common(state, tok);
}

static int PTRCALL
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:
    return XML_ROLE_PI;
  case XML_TOK_COMMENT:
    return XML_ROLE_COMMENT;
  case XML_TOK_INSTANCE_START:
    state->handler = error;
    return XML_ROLE_INSTANCE_START;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_NAME:
  case XML_TOK_PREFIXED_NAME:
    state->handler = doctype1;
    return XML_ROLE_DOCTYPE_NAME;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_OPEN_BRACKET:
    state->handler = internalSubset;
    return XML_ROLE_DOCTYPE_INTERNAL_SUBSET;
  case XML_TOK_DECL_CLOSE:
    state->handler = prolog2;
    return XML_ROLE_DOCTYPE_CLOSE;
  case XML_TOK_NAME:
    if (XmlNameMatchesAscii(enc, ptr, end, KW_SYSTEM)) {
      state->handler = doctype3;
      return XML_ROLE_DOCTYPE_NONE;
    }
    if (XmlNameMatchesAscii(enc, ptr, end, KW_PUBLIC)) {
      state->handler = doctype2;
      return XML_ROLE_DOCTYPE_NONE;
    }
    break;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_LITERAL:
    state->handler = doctype3;
    return XML_ROLE_DOCTYPE_PUBLIC_ID;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_LITERAL:
    state->handler = doctype4;
    return XML_ROLE_DOCTYPE_SYSTEM_ID;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_OPEN_BRACKET:
    state->handler = internalSubset;
    return XML_ROLE_DOCTYPE_INTERNAL_SUBSET;
  case XML_TOK_DECL_CLOSE:
    state->handler = prolog2;
    return XML_ROLE_DOCTYPE_CLOSE;
  }
  return common(state, tok);
}

static int PTRCALL
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_DOCTYPE_NONE;
  case XML_TOK_DECL_CLOSE:
    state->handler = prolog2;
    return XML_ROLE_DOCTYPE_CLOSE;
  }
  return common(state, tok);
}

static int PTRCALL
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),
                            end,
                            KW_ENTITY)) {
      state->handler = entity0;
      return XML_ROLE_ENTITY_NONE;
    }
    if (XmlNameMatchesAscii(enc,
                            ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                            end,
                            KW_ATTLIST)) {
      state->handler = attlist0;
      return XML_ROLE_ATTLIST_NONE;
    }
    if (XmlNameMatchesAscii(enc,
                            ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                            end,
                            KW_ELEMENT)) {
      state->handler = element0;
      return XML_ROLE_ELEMENT_NONE;
    }
    if (XmlNameMatchesAscii(enc,
                            ptr + 2 * MIN_BYTES_PER_CHAR(enc),
                            end,
                            KW_NOTATION)) {
      state->handler = notation0;
      return XML_ROLE_NOTATION_NONE;
    }
    break;
  case XML_TOK_PI:
    return XML_ROLE_PI;
  case XML_TOK_COMMENT:
    return XML_ROLE_COMMENT;
  case XML_TOK_PARAM_ENTITY_REF:
    return XML_ROLE_PARAM_ENTITY_REF;
  case XML_TOK_CLOSE_BRACKET:
    state->handler = doctype5;
    return XML_ROLE_DOCTYPE_NONE;
  case XML_TOK_NONE:
    return XML_ROLE_NONE;
  }
  return common(state, tok);
}

#ifdef XML_DTD

static int PTRCALL
externalSubset0(PROLOG_STATE *state,
                int tok,
                const char *ptr,
                const char *end,
                const ENCODING *enc)
{
  state->handler = externalSubset1;
  if (tok == XML_TOK_XML_DECL)
    return XML_ROLE_TEXT_DECL;
  return externalSubset1(state, tok, ptr, end, enc);
}

static int PTRCALL
externalSubset1(PROLOG_STATE *state,
                int tok,
                const char *ptr,
                const char *end,
                const ENCODING *enc)
{
  switch (tok) {
  case XML_TOK_COND_SECT_OPEN:
    state->handler = condSect0;
    return XML_ROLE_NONE;
  case XML_TOK_COND_SECT_CLOSE:
    if (state->includeLevel == 0)
      break;
    state->includeLevel -= 1;
    return XML_ROLE_NONE;
  case XML_TOK_PROLOG_S:
    return XML_ROLE_NONE;
  case XML_TOK_CLOSE_BRACKET:
    break;
  case XML_TOK_NONE:
    if (state->includeLevel)
      break;
    return XML_ROLE_NONE;
  default:
    return internalSubset(state, tok, ptr, end, enc);
  }
  return common(state, tok);
}

#endif /* XML_DTD */

static int PTRCALL
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_ENTITY_NONE;
  case XML_TOK_PERCENT:
    state->handler = entity1;
    return XML_ROLE_ENTITY_NONE;
  case XML_TOK_NAME:
    state->handler = entity2;