Ejemplo n.º 1
0
  /**
   * With start inparam being the first significant token in a selector, build the selector group
   * (aka comma separated selectors), expected return when iter.last is '{'. On error, issue to
   * errorlistener, and return (caller will forward).
   *
   * @return A syntactically valid CssSelector list, or null if fail.
   * @throws CssException
   */
  private List<CssSelector> handleSelectors(
      CssToken start, CssTokenIterator iter, CssErrorHandler err) throws CssException {

    List<CssSelector> selectors = Lists.newArrayList();
    boolean end = false;
    while (true) { // comma loop
      CssSelector selector = new CssSelector(start.location);
      while (true) { // combinator loop
        CssSimpleSelectorSequence seq =
            CssSelectorConstructFactory.createSimpleSelectorSequence(start, iter, err);
        if (seq == null) {
          // errors already issued
          return null;
        }
        selector.components.add(seq);
        int idx = iter.index();
        start = iter.next();
        if (MATCH_OPENBRACE.apply(start)) {
          end = true;
          break;
        }
        if (MATCH_COMMA.apply(start)) {
          break;
        }

        CssSelectorCombinator comb = CssSelectorConstructFactory.createCombinator(start, iter, err);
        if (comb != null) {
          selector.components.add(comb);
          start = iter.next();
        } else if (iter.list.get(idx + 1).type == CssToken.Type.S) {
          selector.components.add(new CssSelectorCombinator(' ', start.location));
        } else {
          err.error(
              new CssGrammarException(
                  GRAMMAR_UNEXPECTED_TOKEN, iter.last.location, iter.last.chars));
          return null;
        }
      } // combinator loop
      selectors.add(selector);
      if (end) {
        break;
      }
      if (debug) {
        checkState(MATCH_COMMA.apply(start));
      }
      start = iter.next();
    } // comma loop
    return selectors;
  }
Ejemplo n.º 2
0
 /**
  * With iter.last at '{', discover the at-rule type. The contents is a ruleset if '{' comes before
  * ';' or '}'.
  */
 private boolean hasRuleSet(CssAtRule atRule, CssTokenIterator iter) {
   int debugIndex;
   if (debug) {
     checkArgument(iter.last.getChar() == '{');
     debugIndex = iter.index();
   }
   List<CssToken> list = iter.list;
   for (int i = iter.index() + 1; i < list.size(); i++) {
     CssToken tk = list.get(i);
     if (MATCH_OPENBRACE.apply(tk)) {
       return true;
     } else if (MATCH_SEMI_CLOSEBRACE.apply(tk)) {
       return false;
     }
   }
   if (debug) {
     checkState(iter.last.getChar() == '{');
     checkState(iter.index() == debugIndex);
   }
   return false;
 }
Ejemplo n.º 3
0
  /**
   * With start token required to be an ATKEYWORD, collect at-rule parameters if any, and if the
   * at-rule has a block, invoke those handlers.
   */
  private void handleAtRule(
      CssToken start, CssTokenIterator iter, CssContentHandler doc, CssErrorHandler err)
      throws CssException {

    if (debug) {
      checkArgument(start.type == CssToken.Type.ATKEYWORD);
      checkArgument(iter.index() == iter.list.indexOf(start));
      checkArgument(iter.filter() == FILTER_S_CMNT);
    }

    CssAtRule atRule = new CssAtRule(start.getChars(), start.location);

    CssToken tk;
    try {
      while (true) {
        tk = iter.next();
        if (MATCH_SEMI_OPENBRACE.apply(tk)) {
          // ';' or '{', expected end
          atRule.hasBlock = tk.getChar() == '{';
          break;
        } else {
          CssConstruct param = handleAtRuleParam(tk, iter, doc, err);
          if (param == null) {
            // issue error, forward, then return
            err.error(
                new CssGrammarException(
                    GRAMMAR_UNEXPECTED_TOKEN, iter.last.location, iter.last.chars));
            // skip to atrule closebrace, ignoring any inner blocks
            int stack = 0;
            while (true) {
              CssToken tok = iter.next();
              if (MATCH_SEMI.apply(tok) && stack == 0) {
                return; // a non-block at rule
              } else if (MATCH_OPENBRACE.apply(tok)) {
                stack++;
              } else if (MATCH_CLOSEBRACE.apply(tok)) {
                if (stack == 1) {
                  break;
                }
                stack--;
              }
            }
            return;
          } else {
            atRule.components.add(param);
          }
        }
      }
    } catch (NoSuchElementException nse) {
      // UAs required to close any open constructs on premature EOF
      doc.startAtRule(atRule);
      err.error(
          new CssGrammarException(
              GRAMMAR_PREMATURE_EOF, iter.last.location, "';' " + Messages.get("or") + " '{'"));
      doc.endAtRule(atRule.getName().get());
      throw new PrematureEOFException();
    }

    if (debug) {
      checkArgument(MATCH_SEMI_OPENBRACE.apply(iter.last));
      checkArgument(iter.filter() == FILTER_S_CMNT);
    }

    // ending up here only on expected end
    doc.startAtRule(atRule);
    if (atRule.hasBlock) {
      try {
        if (hasRuleSet(atRule, iter)) {
          while (!MATCH_CLOSEBRACE.apply(iter.next())) {
            if (iter.last.type == CssToken.Type.ATKEYWORD) {
              handleAtRule(iter.last, iter, doc, err);
            } else {
              handleRuleSet(iter.last, iter, doc, err);
            }
          }
        } else {
          handleDeclarationBlock(iter.next(), iter, doc, err);
        }
      } catch (NoSuchElementException nse) {
        err.error(new CssGrammarException(GRAMMAR_PREMATURE_EOF, iter.last.location, "'}'"));
        doc.endAtRule(atRule.name.get());
        throw new PrematureEOFException();
      }
    }
    doc.endAtRule(atRule.name.get());
  }