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src/subversion/subversion/libsvn_subr/xml.c  view on Meta::CPAN


/*** Creating attribute hashes. ***/

/* Combine an existing attribute list ATTS with a HASH that itself
   represents an attribute list.  Iff PRESERVE is true, then no value
   already in HASH will be changed, else values from ATTS will
   override previous values in HASH. */
static void
amalgamate(const char **atts,
           apr_hash_t *ht,
           svn_boolean_t preserve,
           apr_pool_t *pool)
{
  const char *key;

  if (atts)
    for (key = *atts; key; key = *(++atts))
      {
        const char *val = *(++atts);
        size_t keylen;
        assert(key != NULL);
        /* kff todo: should we also insist that val be non-null here?
           Probably. */

        keylen = strlen(key);
        if (preserve && ((apr_hash_get(ht, key, keylen)) != NULL))
          continue;
        else
          apr_hash_set(ht, apr_pstrndup(pool, key, keylen), keylen,
                       val ? apr_pstrdup(pool, val) : NULL);
      }
}


apr_hash_t *
svn_xml_ap_to_hash(va_list ap, apr_pool_t *pool)
{
  apr_hash_t *ht = apr_hash_make(pool);
  const char *key;

  while ((key = va_arg(ap, char *)) != NULL)
    {
      const char *val = va_arg(ap, const char *);
      svn_hash_sets(ht, key, val);
    }

  return ht;
}


apr_hash_t *
svn_xml_make_att_hash(const char **atts, apr_pool_t *pool)
{
  apr_hash_t *ht = apr_hash_make(pool);
  amalgamate(atts, ht, 0, pool);  /* third arg irrelevant in this case */
  return ht;
}


void
svn_xml_hash_atts_overlaying(const char **atts,
                             apr_hash_t *ht,
                             apr_pool_t *pool)
{
  amalgamate(atts, ht, 0, pool);
}


void
svn_xml_hash_atts_preserving(const char **atts,
                             apr_hash_t *ht,
                             apr_pool_t *pool)
{
  amalgamate(atts, ht, 1, pool);
}



/*** Making XML tags. ***/


void
svn_xml_make_open_tag_hash(svn_stringbuf_t **str,
                           apr_pool_t *pool,
                           enum svn_xml_open_tag_style style,
                           const char *tagname,
                           apr_hash_t *attributes)
{
  apr_hash_index_t *hi;
  apr_size_t est_size = strlen(tagname) + 4 + apr_hash_count(attributes) * 30;

  if (*str == NULL)
    *str = svn_stringbuf_create_ensure(est_size, pool);

  svn_stringbuf_appendcstr(*str, "<");
  svn_stringbuf_appendcstr(*str, tagname);

  for (hi = apr_hash_first(pool, attributes); hi; hi = apr_hash_next(hi))
    {
      const void *key;
      void *val;

      apr_hash_this(hi, &key, NULL, &val);
      assert(val != NULL);

      svn_stringbuf_appendcstr(*str, "\n   ");
      svn_stringbuf_appendcstr(*str, key);
      svn_stringbuf_appendcstr(*str, "=\"");
      svn_xml_escape_attr_cstring(str, val, pool);
      svn_stringbuf_appendcstr(*str, "\"");
    }

  if (style == svn_xml_self_closing)
    svn_stringbuf_appendcstr(*str, "/");
  svn_stringbuf_appendcstr(*str, ">");
  if (style != svn_xml_protect_pcdata)
    svn_stringbuf_appendcstr(*str, "\n");
}


void