Example usage for org.antlr.v4.runtime CharStream seek

Introduction

In this page you can find the example usage for org.antlr.v4.runtime CharStream seek.

Prototype

void seek(int index);

Source Link

Document

Set the input cursor to the position indicated by index .

Usage

From source file:com.antsdb.saltedfish.sql.mysql.ExprGenerator.java

License:Open Source License

private static byte[] getBytes(Literal_value_binaryContext rule) {
    Token token = rule.STRING_LITERAL().getSymbol();
    byte[] bytes = new byte[token.getStopIndex() - token.getStartIndex() - 1];
    CharStream cs = token.getInputStream();
    int pos = cs.index();
    cs.seek(token.getStartIndex() + 1);
    int j = 0;/*from   www.  j  a va2  s. c om*/
    for (int i = 0; i < bytes.length; i++) {
        int ch = cs.LA(i + 1);
        if (ch == '\\') {
            i++;
            ch = cs.LA(i + 1);
            if (ch == '0') {
                ch = 0;
            } else if (ch == 'n') {
                ch = '\n';
            } else if (ch == 'r') {
                ch = '\r';
            } else if (ch == 'Z') {
                ch = '\032';
            }
        }
        bytes[j] = (byte) ch;
        j++;
    }
    cs.seek(pos);
    if (j != bytes.length) {
        // esacpe characters
        byte[] old = bytes;
        bytes = new byte[j];
        System.arraycopy(old, 0, bytes, 0, j);
    }
    return bytes;
}

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From source file:com.twosigma.beaker.groovy.autocomplete.PositionAdjustingLexerATNSimulator.java

License:Apache License

protected void resetAcceptPosition(CharStream input, int index, int line, int charPositionInLine) {
    input.seek(index);
    this.line = line;
    this.charPositionInLine = charPositionInLine;
    consume(input);//from w w w .  j a  v  a  2s .co m
}

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From source file:org.tvl.goworks.editor.go.parser.CurrentMemberContextParserTask.java

License:Open Source License

@Override
@RuleDependency(recognizer = GoParser.class, rule = GoParser.RULE_topLevelDecl, version = 0)
public void parse(ParserTaskManager taskManager, ParseContext parseContext, DocumentSnapshot snapshot,
        Collection<? extends ParserDataDefinition<?>> requestedData, ParserResultHandler results)
        throws InterruptedException, ExecutionException {

    if (requestedData.contains(GoParserDataDefinitions.CURRENT_DECLARATION_CONTEXT)) {
        CurrentDeclarationContextData data = null;
        SnapshotPosition position = parseContext.getPosition();
        if (position != null) {
            int caretOffset = position.getOffset();

            Future<ParserData<List<Anchor>>> result = taskManager.getData(snapshot,
                    GoParserDataDefinitions.DYNAMIC_ANCHOR_POINTS, EnumSet.of(ParserDataOptions.SYNCHRONOUS));

            ParserData<List<Anchor>> anchorsData = result != null ? result.get() : null;
            List<Anchor> anchors = anchorsData.getData();

            TopLevelDeclContext context = null;

            if (anchors != null) {
                Anchor enclosing = null;

                /*/* w ww  . j  av a2 s. co m*/
                * parse the current rule
                */
                for (Anchor anchor : anchors) {
                    if (anchor.getSpan().getStartPosition(snapshot).getOffset() <= caretOffset
                            && anchor.getSpan().getEndPosition(snapshot).getOffset() > caretOffset) {
                        enclosing = anchor;
                    } else if (anchor.getSpan().getStartPosition(snapshot).getOffset() > caretOffset) {
                        break;
                    }
                }

                if (enclosing != null) {
                    CharStream input = new DocumentSnapshotCharStream(snapshot);
                    input.seek(enclosing.getSpan().getStartPosition(snapshot).getOffset());
                    GoLexer lexer = new GoLexer(input);
                    CommonTokenStream tokens = new TaskTokenStream(lexer);
                    final GoParser parser = GoParserFactory.DEFAULT.getParser(tokens,
                            ParserConfiguration.PRECISE);
                    parser.removeErrorListeners();
                    parser.setBuildParseTree(true);
                    context = parser.topLevelDecl();
                }
            }

            data = new CurrentDeclarationContextData(snapshot, context);
        }

        results.addResult(new BaseParserData<>(parseContext,
                GoParserDataDefinitions.CURRENT_DECLARATION_CONTEXT, snapshot, data));
    }
}

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