Example usage for org.antlr.v4.runtime BufferedTokenStream getHiddenTokensToLeft

Introduction

In this page you can find the example usage for org.antlr.v4.runtime BufferedTokenStream getHiddenTokensToLeft.

Prototype

public List<Token> getHiddenTokensToLeft(int tokenIndex) 

Source Link

Document

Collect all hidden tokens (any off-default channel) to the left of the current token up until we see a token on DEFAULT_TOKEN_CHANNEL.

Usage

From source file:org.sourcepit.ltk.parser.ParseTreeBuilder.java

License:Apache License

private Rule handleRuleNode(Terminal origin, Rule parent, RuleNode ruleNode) {
    final RuleContext ruleContext = ruleNode.getRuleContext();
    final List<ParseNode> children = new ArrayList<>();
    final Rule rule = new Rule(parent, children, ruleContext.getClass(), origin);
    for (int i = 0; i < ruleNode.getChildCount(); i++) {
        final ParseTree child = ruleNode.getChild(i);
        if (child instanceof RuleNode) {
            children.add(handleRuleNode(null, rule, (RuleNode) child));
        } else {/* w  w  w  . j  a v a  2 s  .  c o m*/
            final TerminalNode terminalNode = (TerminalNode) child;
            final ParseResult parseResult = parseResultStack.peek();
            final BufferedTokenStream tokenStream = parseResult.getTokenStream();
            final org.antlr.v4.runtime.Token token = terminalNode.getSymbol();
            final int tokenIndex = token.getTokenIndex();

            // final TerminalContext tc = new TerminalContext();
            // tc.terminalNode = terminalNode;
            // tc.tokenStream = tokenStream;

            // tokenIndexToTerminalNodeMap.put(Integer.valueOf(tokenIndex), tc);

            final List<org.antlr.v4.runtime.Token> hiddenTokensToLeft = tokenStream
                    .getHiddenTokensToLeft(tokenIndex);
            if (hiddenTokensToLeft != null && !hiddenTokensToLeft.isEmpty()) {
                int prevTokenIdx = hiddenTokensToLeft.get(0).getTokenIndex() - 1;
                int startIdx;
                if (prevTokenIdx < 0) {
                    startIdx = 0;
                } else {
                    // final TerminalContext preTc = tokenIndexToTerminalNodeMap.get(Integer.valueOf(prevTokenIdx));
                    // final TerminalNode preTerminalNode = preTc.terminalNode;
                    // startIdx = parserDelegeate.getLen((RuleNode) preTerminalNode.getParent(),
                    // preTerminalNode.getSymbol(),
                    // hiddenTokensToLeft, preTc.tokenStream);
                    startIdx = tokenIndexToHiddenWsLength.get(Integer.valueOf(prevTokenIdx));
                }
                for (int j = startIdx; j < hiddenTokensToLeft.size(); j++) {
                    final TerminalNodeImpl dummy = new TerminalNodeImpl(hiddenTokensToLeft.get(j));
                    dummy.parent = ruleNode;
                    children.add(handleTerminalNode(null, rule, dummy));
                }
            }

            if (terminalNode.getSymbol().getType() != Lexer.EOF) {
                children.add(handleTerminalNode(null, rule, terminalNode));
            }

            final List<org.antlr.v4.runtime.Token> hiddenTokensToRight = tokenStream
                    .getHiddenTokensToRight(tokenIndex);
            if (hiddenTokensToRight != null) {
                int len = parserDelegeate.getLen(ruleNode, token, hiddenTokensToRight, tokenStream);
                tokenIndexToHiddenWsLength.put(Integer.valueOf(tokenIndex), Integer.valueOf(len));
                for (int j = 0; j < len; j++) {
                    final TerminalNodeImpl dummy = new TerminalNodeImpl(hiddenTokensToRight.get(j));
                    dummy.parent = ruleNode;
                    children.add(handleTerminalNode(null, rule, dummy));
                }
            }
        }
    }
    return rule;
}

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