Пример #1
0
  /**
   * Checks if the specified step will never yield results.
   *
   * @param rt root value
   * @param s index of step
   * @return {@code true} if steps will never yield results
   */
  private boolean emptyPath(final Value rt, final int s) {
    final Step step = axisStep(s);
    if (step == null) return false;

    final Axis axis = step.axis;
    if (s == 0) {
      // first location step:
      if (root instanceof CAttr) {
        // @.../child:: / @.../descendant::
        if (axis == CHILD || axis == DESC) return true;
      } else if (root instanceof Root
          || root instanceof CDoc
          || rt != null && rt.type == NodeType.DOC) {
        if (axis == SELF || axis == ANCORSELF) {
          if (step.test != Test.NOD && step.test != Test.DOC) return true;
        } else if (axis == CHILD || axis == DESC) {
          if (step.test == Test.DOC || step.test == Test.ATT) return true;
        } else if (axis == DESCORSELF) {
          if (step.test == Test.ATT) return true;
        } else {
          return true;
        }
      }
    } else {
      // remaining steps:
      final Step last = axisStep(s - 1);
      if (last == null) return false;

      // .../self:: / .../descendant-or-self::
      if (axis == SELF || axis == DESCORSELF) {
        if (step.test == Test.NOD) return false;
        // @.../..., text()/...
        if (last.axis == ATTR && step.test.type != NodeType.ATT
            || last.test == Test.TXT && step.test != Test.TXT) return true;
        if (axis == DESCORSELF) return false;

        // .../self::
        final QNm name = step.test.name, lastName = last.test.name;
        if (lastName == null
            || name == null
            || lastName.local().length == 0
            || name.local().length == 0) return false;
        // ...X/...Y
        return !name.eq(lastName);
      }
      // .../following-sibling:: / .../preceding-sibling::
      if (axis == FOLLSIBL || axis == PRECSIBL) return last.axis == ATTR;
      // .../descendant:: / .../child:: / .../attribute::
      if (axis == DESC || axis == CHILD || axis == ATTR)
        return last.axis == ATTR
            || last.test == Test.TXT
            || last.test == Test.COM
            || last.test == Test.PI
            || axis == ATTR && step.test == Test.NSP;
      // .../parent:: / .../ancestor::
      if (axis == PARENT || axis == ANC) return last.test == Test.DOC;
    }
    return false;
  }
Пример #2
0
 /**
  * Checks if the location path contains steps that will never yield results.
  *
  * @param stps step array
  * @param ctx query context
  */
 void voidStep(final Expr[] stps, final QueryContext ctx) {
   for (int l = 0; l < stps.length; ++l) {
     final Step s = axisStep(l);
     if (s == null) continue;
     final Axis sa = s.axis;
     if (l == 0) {
       if (root instanceof CAttr) {
         // @.../child:: / @.../descendant::
         if (sa == CHILD || sa == DESC) {
           ctx.compInfo(WARNDESC, root);
           return;
         }
       } else if (root instanceof Root
           || root instanceof Value && ((Value) root).type == NodeType.DOC
           || root instanceof CDoc) {
         if (sa != CHILD
             && sa != DESC
             && sa != DESCORSELF
             && (sa != SELF && sa != ANCORSELF || s.test != Test.NOD && s.test != Test.DOC)) {
           ctx.compInfo(WARNDOC, root, sa);
           return;
         }
       }
     } else {
       final Step ls = axisStep(l - 1);
       if (ls == null) continue;
       final Axis lsa = ls.axis;
       boolean warning = true;
       if (sa == SELF || sa == DESCORSELF) {
         // .../self:: / .../descendant-or-self::
         if (s.test == Test.NOD) continue;
         // @.../..., text()/...
         warning =
             lsa == ATTR && s.test.type != NodeType.ATT
                 || ls.test == Test.TXT && s.test != Test.TXT;
         if (!warning) {
           if (sa == DESCORSELF) continue;
           // .../self::
           final QNm n0 = ls.test.name;
           final QNm n1 = s.test.name;
           if (n0 == null || n1 == null || n0.local().length == 0 || n1.local().length == 0)
             continue;
           // ...X/...Y
           warning = !n1.eq(n0);
         }
       } else if (sa == FOLLSIBL || sa == PRECSIBL) {
         // .../following-sibling:: / .../preceding-sibling::
         warning = lsa == ATTR;
       } else if (sa == DESC || sa == CHILD || sa == ATTR) {
         // .../descendant:: / .../child:: / .../attribute::
         warning =
             lsa == ATTR
                 || ls.test == Test.TXT
                 || ls.test == Test.COM
                 || ls.test == Test.PI
                 || sa == ATTR && s.test == Test.NSP;
       } else if (sa == PARENT || sa == ANC) {
         // .../parent:: / .../ancestor::
         warning = ls.test == Test.DOC;
       }
       if (warning) {
         ctx.compInfo(WARNSELF, s);
         return;
       }
     }
   }
 }