Examples of org.antlr.v4.runtime.tree.pattern.Chunk

Package org.antlr.v4.runtime.tree.pattern

Examples of org.antlr.v4.runtime.tree.pattern.Chunk

org.antlr.v4.tool.ast.BlockAST
A chunk is either a token tag, a rule tag, or a span of literal text within a tree pattern.
The method {@link ParseTreePatternMatcher#split(String)} returns a list ofchunks in preparation for creating a token stream by {@link ParseTreePatternMatcher#tokenize(String)}. From there, we get a parse tree from with {@link ParseTreePatternMatcher#compile(String,int)}. These chunks are converted to {@link RuleTagToken}, {@link TokenTagToken}, or the regular tokens of the text surrounding the tags.

    ATNOptimizer.optimize(g, atn);


    for (Triple<Rule, ATNState, ATNState> pair : preventEpsilonClosureBlocks) {
      LL1Analyzer analyzer = new LL1Analyzer(atn);
      if (analyzer.LOOK(pair.b, pair.c, null).contains(org.antlr.v4.runtime.Token.EPSILON)) {
        ErrorType errorType = pair.a instanceof LeftRecursiveRule ? ErrorType.EPSILON_LR_FOLLOW : ErrorType.EPSILON_CLOSURE;
        g.tool.errMgr.grammarError(errorType, g.fileName, ((GrammarAST)pair.a.ast.getChild(0)).getToken(), pair.a.name);
      }
    }


    optionalCheck:

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  /* start->ruleblock->end */
  @NotNull
  @Override
  public Handle rule(@NotNull GrammarAST ruleAST, @NotNull String name, @NotNull Handle blk) {
    Rule r = g.getRule(name);
    RuleStartState start = atn.ruleToStartState[r.index];
    epsilon(start, blk.left);
    RuleStopState stop = atn.ruleToStopState[r.index];
    epsilon(blk.right, stop);
    Handle h = new Handle(start, stop);

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    return h;
  }


  @NotNull
  public Handle _ruleRef(@NotNull GrammarAST node) {
    Rule r = g.getRule(node.getText());
    if ( r==null ) {
      g.tool.errMgr.grammarError(ErrorType.INTERNAL_ERROR, g.fileName, node.getToken(), "Rule "+node.getText()+" undefined");
      return null;
    }
    RuleStartState start = atn.ruleToStartState[r.index];

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    boolean stateReachesStopState = false;
    for (int i=0; i<n; i++) {
      Transition t = s.transition(i);
      if ( t instanceof RuleTransition ) {
        RuleTransition rt = (RuleTransition) t;
        Rule r = g.getRule(rt.ruleIndex);
        if ( rulesVisitedPerRuleCheck.contains((RuleStartState)t.target) ) {
          addRulesToCycle(enclosingRule, r);
        }
        else {
          // must visit if not already visited; mark target, pop when done

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//    System.out.println("setAltAssoc: op " + alt + ": " + t.getText()+", assoc="+assoc);
  }


  @Override
  public void binaryAlt(AltAST originalAltTree, int alt) {
    AltAST altTree = (AltAST)originalAltTree.dupTree();
    String altLabel = altTree.altLabel!=null ? altTree.altLabel.getText() : null;


    String label = null;
    boolean isListLabel = false;
    GrammarAST lrlabel = stripLeftRecursion(altTree);

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    //System.out.println("binaryAlt " + alt + ": " + altText + ", rewrite=" + rewriteText);
  }


  @Override
  public void prefixAlt(AltAST originalAltTree, int alt) {
    AltAST altTree = (AltAST)originalAltTree.dupTree();
    stripAltLabel(altTree);


    int nextPrec = precedence(alt);
    // rewrite e to be e_[prec]
    altTree = addPrecedenceArgToRules(altTree, nextPrec);

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   * {@code (BLOCK (ALT .))} or {@code (BLOCK (ALT 'a') (ALT .))}.
   */
  public static boolean blockHasWildcardAlt(@NotNull GrammarAST block) {
    for (Object alt : block.getChildren()) {
      if ( !(alt instanceof AltAST) ) continue;
      AltAST altAST = (AltAST)alt;
      if ( altAST.getChildCount()==1 || (altAST.getChildCount() == 2 && altAST.getChild(0).getType() == ANTLRParser.ELEMENT_OPTIONS) ) {
        Tree e = altAST.getChild(altAST.getChildCount() - 1);
        if ( e.getType()==ANTLRParser.WILDCARD ) {
          return true;
        }
      }
    }

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    //System.out.println("prefixAlt " + alt + ": " + altText + ", rewrite=" + rewriteText);
  }


  @Override
  public void suffixAlt(AltAST originalAltTree, int alt) {
    AltAST altTree = (AltAST)originalAltTree.dupTree();
    String altLabel = altTree.altLabel!=null ? altTree.altLabel.getText() : null;


    String label = null;
    boolean isListLabel = false;
    GrammarAST lrlabel = stripLeftRecursion(altTree);

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//    System.out.println("suffixAlt " + alt + ": " + altText + ", rewrite=" + rewriteText);
  }


  @Override
  public void otherAlt(AltAST originalAltTree, int alt) {
    AltAST altTree = (AltAST)originalAltTree.dupTree();
    stripAltLabel(altTree);
    String altText = text(altTree);
    String altLabel = altTree.altLabel!=null ? altTree.altLabel.getText() : null;
    LeftRecursiveRuleAltInfo a =
      new LeftRecursiveRuleAltInfo(alt, altText, null, altLabel, false, originalAltTree);

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    end.loopBackState = loop;


    plusAST.atnState = loop;
    epsilon(blkEnd, loop);    // blk can see loop back


    BlockAST blkAST = (BlockAST)plusAST.getChild(0);
    if ( ((QuantifierAST)plusAST).isGreedy() ) {
      if (expectNonGreedy(blkAST)) {
        g.tool.errMgr.grammarError(ErrorType.EXPECTED_NON_GREEDY_WILDCARD_BLOCK, g.fileName, plusAST.getToken(), plusAST.getToken().getText());
      }

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Related Classes of org.antlr.v4.runtime.tree.pattern.Chunk

org.antlr.runtime.ANTLRFileStream

org.antlr.runtime.ANTLRStringStream

org.antlr.runtime.CharStream

org.antlr.runtime.CommonToken

org.antlr.runtime.Token

org.antlr.runtime.tree.CommonTree

org.antlr.runtime.tree.CommonTreeNodeStream

org.antlr.runtime.tree.Tree

org.antlr.runtime.tree.TreeVisitor

org.antlr.runtime.tree.TreeVisitorAction

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