xmlparse.c

一个很好用的解析

    *eventPP = s = next;
  }
  /* not reached */
}

/* If tagNamePtr is non-null, build a real list of attributes,
otherwise just check the attributes for well-formedness. */

static enum XML_Error storeAtts(XML_Parser parser, const ENCODING *enc,
                                const char *attStr, TAG_NAME *tagNamePtr,
                                BINDING **bindingsPtr)
{
  ELEMENT_TYPE *elementType = 0;
  int nDefaultAtts = 0;
  const XML_Char ** appAtts;
      /* the attribute list to pass to the application */
  int attIndex = 0;
  int i;
  int n;
  int nPrefixes = 0;
  BINDING *binding;
  const XML_Char *localPart;

  /* lookup the element type name */
  if (tagNamePtr) {
    elementType = (ELEMENT_TYPE *)
        lookup(&dtd.elementTypes, tagNamePtr->str, 0);
    if (!elementType) {
      tagNamePtr->str = poolCopyString(&dtd.pool, tagNamePtr->str);
      if (!tagNamePtr->str)
        return XML_ERROR_NO_MEMORY;
      elementType = (ELEMENT_TYPE *)
          lookup(&dtd.elementTypes, tagNamePtr->str, sizeof(ELEMENT_TYPE));
      if (!elementType)
        return XML_ERROR_NO_MEMORY;
      if (ns && !setElementTypePrefix(parser, elementType))
        return XML_ERROR_NO_MEMORY;
    }
    nDefaultAtts = elementType->nDefaultAtts;
  }
  /* get the attributes from the tokenizer */
  n = XmlGetAttributes(enc, attStr, attsSize, atts);
  if (n + nDefaultAtts > attsSize) {
    int oldAttsSize = attsSize;
    attsSize = n + nDefaultAtts + INIT_ATTS_SIZE;
    atts = realloc((void *)atts, attsSize * sizeof(ATTRIBUTE));
    if (!atts)
      return XML_ERROR_NO_MEMORY;
    if (n > oldAttsSize)
      XmlGetAttributes(enc, attStr, n, atts);
  }
  appAtts = (const XML_Char **)atts;
  for (i = 0; i < n; i++) {
    /* add the name and value to the attribute list */
    ATTRIBUTE_ID *attId = getAttributeId(parser, enc, atts[i].name,
                                         atts[i].name
                                         + XmlNameLength(enc, atts[i].name));
    if (!attId)
      return XML_ERROR_NO_MEMORY;
    /* detect duplicate attributes */
    if ((attId->name)[-1]) {
      if (enc == encoding)
        eventPtr = atts[i].name;
      return XML_ERROR_DUPLICATE_ATTRIBUTE;
    }
    (attId->name)[-1] = 1;
    appAtts[attIndex++] = attId->name;
    if (!atts[i].normalized) {
      enum XML_Error result;
      int isCdata = 1;

      /* figure out whether declared as other than CDATA */
      if (attId->maybeTokenized) {
        int j;
        for (j = 0; j < nDefaultAtts; j++) {
          if (attId == elementType->defaultAtts[j].id) {
            isCdata = elementType->defaultAtts[j].isCdata;
            break;
          }
        }
      }

      /* normalize the attribute value */
      result = storeAttributeValue(parser, enc, isCdata,
                                   atts[i].valuePtr, atts[i].valueEnd,
                                   &tempPool);
      if (result)
        return result;
      if (tagNamePtr) {
        appAtts[attIndex] = poolStart(&tempPool);
        poolFinish(&tempPool);
      }
      else
        poolDiscard(&tempPool);
    }
    else if (tagNamePtr) {
      /* the value did not need normalizing */
      appAtts[attIndex] =
          poolStoreString(&tempPool, enc, atts[i].valuePtr, atts[i].valueEnd);
      if (appAtts[attIndex] == 0)
        return XML_ERROR_NO_MEMORY;
      poolFinish(&tempPool);
    }
    /* handle prefixed attribute names */
    if (attId->prefix && tagNamePtr) {
      if (attId->xmlns) {
        /* deal with namespace declarations here */
        if (!addBinding(parser, attId->prefix, attId, appAtts[attIndex],
                        bindingsPtr))
          return XML_ERROR_NO_MEMORY;
        --attIndex;
      }
      else {
        /* deal with other prefixed names later */
        attIndex++;
        nPrefixes++;
        (attId->name)[-1] = 2;
      }
    }
    else
      attIndex++;
  }
  if (tagNamePtr) {
    int j;
    nSpecifiedAtts = attIndex;
    if (elementType->idAtt && (elementType->idAtt->name)[-1]) {
      for (i = 0; i < attIndex; i += 2)
        if (appAtts[i] == elementType->idAtt->name) {
          idAttIndex = i;
          break;
        }
    }
    else
      idAttIndex = -1;
    /* do attribute defaulting */
    for (j = 0; j < nDefaultAtts; j++) {
      const DEFAULT_ATTRIBUTE *da = elementType->defaultAtts + j;
      if (!(da->id->name)[-1] && da->value) {
        if (da->id->prefix) {
          if (da->id->xmlns) {
            if (!addBinding(parser, da->id->prefix, da->id, da->value,
                            bindingsPtr))
              return XML_ERROR_NO_MEMORY;
          }
          else {
            (da->id->name)[-1] = 2;
            nPrefixes++;
            appAtts[attIndex++] = da->id->name;
            appAtts[attIndex++] = da->value;
          }
        }
        else {
          (da->id->name)[-1] = 1;
          appAtts[attIndex++] = da->id->name;
          appAtts[attIndex++] = da->value;
        }
      }
    }
    appAtts[attIndex] = 0;
  }
  i = 0;
  if (nPrefixes) {
    /* expand prefixed attribute names */
    for (; i < attIndex; i += 2) {
      if (appAtts[i][-1] == 2) {
        ATTRIBUTE_ID *id;
        ((XML_Char *)(appAtts[i]))[-1] = 0;
        id = (ATTRIBUTE_ID *)lookup(&dtd.attributeIds, appAtts[i], 0);
        if (id->prefix->binding) {
          int j;
          const BINDING *b = id->prefix->binding;
          const XML_Char *s = appAtts[i];
          for (j = 0; j < b->uriLen; j++) {
            if (!poolAppendChar(&tempPool, b->uri[j]))
              return XML_ERROR_NO_MEMORY;
          }
          while (*s++ != ':')
            ;
          do {
            if (!poolAppendChar(&tempPool, *s))
              return XML_ERROR_NO_MEMORY;
          } while (*s++);
          appAtts[i] = poolStart(&tempPool);
          poolFinish(&tempPool);
        }
        if (!--nPrefixes)
          break;
      }
      else
        ((XML_Char *)(appAtts[i]))[-1] = 0;
    }
  }
  /* clear the flags that say whether attributes were specified */
  for (; i < attIndex; i += 2)
    ((XML_Char *)(appAtts[i]))[-1] = 0;
  if (!tagNamePtr)
    return XML_ERROR_NONE;
  for (binding = *bindingsPtr; binding; binding = binding->nextTagBinding)
    binding->attId->name[-1] = 0;
  /* expand the element type name */
  if (elementType->prefix) {
    binding = elementType->prefix->binding;
    if (!binding)
      return XML_ERROR_NONE;
    localPart = tagNamePtr->str;
    while (*localPart++ != XML_T(':'))
      ;
  }
  else if (dtd.defaultPrefix.binding) {
    binding = dtd.defaultPrefix.binding;
    localPart = tagNamePtr->str;
  }
  else
    return XML_ERROR_NONE;
  tagNamePtr->localPart = localPart;
  tagNamePtr->uriLen = binding->uriLen;
  for (i = 0; localPart[i++];)
    ;
  n = i + binding->uriLen;
  if (n > binding->uriAlloc) {
    TAG *p;
    XML_Char *uri = malloc((n + EXPAND_SPARE) * sizeof(XML_Char));
    if (!uri)
      return XML_ERROR_NO_MEMORY;
    binding->uriAlloc = n + EXPAND_SPARE;
    memcpy(uri, binding->uri, binding->uriLen * sizeof(XML_Char));
    for (p = tagStack; p; p = p->parent)
      if (p->name.str == binding->uri)
        p->name.str = uri;
    free(binding->uri);
    binding->uri = uri;
  }
  memcpy(binding->uri + binding->uriLen, localPart, i * sizeof(XML_Char));
  tagNamePtr->str = binding->uri;
  return XML_ERROR_NONE;
}

static
int addBinding(XML_Parser parser,
               PREFIX *prefix,
               const ATTRIBUTE_ID *attId,
               const XML_Char *uri,
               BINDING **bindingsPtr)
{
  BINDING *b;
  int len;
  for (len = 0; uri[len]; len++)
    ;
  if (namespaceSeparator)
    len++;
  if (freeBindingList) {
    b = freeBindingList;
    if (len > b->uriAlloc) {
      b->uri = realloc(b->uri, sizeof(XML_Char) * (len + EXPAND_SPARE));
      if (!b->uri)
        return 0;
      b->uriAlloc = len + EXPAND_SPARE;
    }
    freeBindingList = b->nextTagBinding;
  }
  else {
    b = malloc(sizeof(BINDING));
    if (!b)
      return 0;
    b->uri = malloc(sizeof(XML_Char) * (len + EXPAND_SPARE));
    if (!b->uri) {
      free(b);
      return 0;
    }
    b->uriAlloc = len + EXPAND_SPARE;
  }
  b->uriLen = len;
  memcpy(b->uri, uri, len * sizeof(XML_Char));
  if (namespaceSeparator)
    b->uri[len - 1] = namespaceSeparator;
  b->prefix = prefix;
  b->attId = attId;
  b->prevPrefixBinding = prefix->binding;
  if (*uri == XML_T('\0') && prefix == &dtd.defaultPrefix)
    prefix->binding = 0;
  else
    prefix->binding = b;
  b->nextTagBinding = *bindingsPtr;
  *bindingsPtr = b;
  if (startNamespaceDeclHandler)
    startNamespaceDeclHandler(handlerArg, prefix->name,
                              prefix->binding ? uri : 0);
  return 1;
}

/* The idea here is to avoid using stack for each CDATA section when
the whole file is parsed with one call. */

static
enum XML_Error cdataSectionProcessor(XML_Parser parser,
                                     const char *start,
                                     const char *end,
                                     const char **endPtr)
{
  enum XML_Error result =
      doCdataSection(parser, encoding, &start, end, endPtr);
  if (start) {
    processor = contentProcessor;
    return contentProcessor(parser, start, end, endPtr);
  }
  return result;
}

/* startPtr gets set to non-null is the section is closed, and to null if
the section is not yet closed. */

static
enum XML_Error doCdataSection(XML_Parser parser,
                              const ENCODING *enc,
                              const char **startPtr,
                              const char *end,
                              const char **nextPtr)
{
  const char *s = *startPtr;
  const char **eventPP;
  const char **eventEndPP;
  if (enc == encoding) {
    eventPP = &eventPtr;
    *eventPP = s;
    eventEndPP = &eventEndPtr;
  }
  else {
    eventPP = &(openInternalEntities->internalEventPtr);
    eventEndPP = &(openInternalEntities->internalEventEndPtr);
  }
  *eventPP = s;
  *startPtr = 0;
  for (;;) {
    const char *next;
    int tok = XmlCdataSectionTok(enc, s, end, &next);
    *eventEndPP = next;
    switch (tok) {
    case XML_TOK_CDATA_SECT_CLOSE:
      if (endCdataSectionHandler)
        endCdataSectionHandler(handlerArg);
      else if (defaultHandler)
        reportDefault(parser, enc, s, next);
      *startPtr = next;
      return XML_ERROR_NONE;
    case XML_TOK_DATA_NEWLINE:
      if (characterDataHandler) {
        XML_Char c = 0xA;
        characterDataHandler(handlerArg, &c, 1);
      }
      else if (defaultHandler)
        reportDefault(parser, enc, s, next);
      break;
    case XML_TOK_DATA_CHARS:
      if (characterDataHandler) {
        if (MUST_CONVERT(enc, s)) {
          for (;;) {
            ICHAR *dataPtr = (ICHAR *)dataBuf;
            XmlConvert(enc, &s, next, &dataPtr, (ICHAR *)dataBufEnd);
            *eventEndPP = next;
            characterDataHandler(handlerArg, dataBuf, dataPtr - (ICHAR *)dataBuf);
            if (s == next)
              break;
            *eventPP = s;
          }
        }
        else
          characterDataHandler(handlerArg,
                               (XML_Char *)s,
                               (XML_Char *)next - (XML_Char *)s);
      }
      else if (defaultHandler)
        reportDefault(parser, enc, s, next);
      break;
    case XML_TOK_INVALID:
      *eventPP = next;
      return XML_ERROR_INVALID_TOKEN;
    case XML_TOK_PARTIAL_CHAR:
      if (nextPtr) {
        *nextPtr = s;
        return XML_ERROR_NONE;
      }
      return XML_ERROR_PARTIAL_CHAR;
    case XML_TOK_PARTIAL:
    case XML_TOK_NONE:
      if (nextPtr) {
        *nextPtr = s;
        return XML_ERROR_NONE;
      }
      return XML_ERROR_UNCLOSED_CDATA_SECTION;
    default:
      abort();
    }
    *eventPP = s = next;
  }
  /* not reached */
}

#ifdef XML_DTD

/* The idea here is to avoid using stack for each IGNORE section when
the whole file is parsed with one call. */

static
enum XML_Error ignoreSectionProcessor(XML_Parser parser,
                                      const char *start,
                                      const char *end,
                                      const char **endPtr)
{
  enum XML_Error result =
      doIgnoreSection(parser, encoding, &start, end, endPtr);
  if (start) {
    processor = prologProcessor;