Example usage for org.antlr.v4.runtime.atn ATNState ATNState

Introduction

In this page you can find the example usage for org.antlr.v4.runtime.atn ATNState ATNState.

Prototype

ATNState

Source Link

Usage

From source file:io.github.hjuergens.time.GenerateParseTreeAST.java

License:Apache License

/**
 * <a href="https://stackoverflow.com/questions/10614659/no-viable-alternative-at-input"></a>
 *///from w w  w  .  j  a  v  a 2  s.  c o m
@Test(expectedExceptions = java.lang.NoSuchFieldError.class)
public void dotTree() {

    // the expression
    String src = "(ICOM LIKE '%bridge%' or ICOM LIKE '%Munich%')";

    // create a lexer & parser
    //DatesLexer lexer = new DatesLexer(new ANTLRStringStream(src));
    //DatesParser parser = new DatesParser(new CommonTokenStream(lexer));

    DatesLexer lexer = new DatesLexer(new ANTLRInputStream(src));
    DatesParser parser = new DatesParser(new CommonTokenStream(lexer));

    // invoke the entry point of the parser (the parse() method) and get the AST
    Tree tree = parser.date();
    String grammarFileName = lexer.getGrammarFileName();
    log.info("grammar file name=" + grammarFileName);

    // print the DOT representation of the AST 
    Grammar grammar = Grammar.load(grammarFileName);
    DOTGenerator gen = new DOTGenerator(grammar);

    ATNState startState = new ATNState() {
        @Override
        public int getStateType() {
            return ATNState.BASIC;
        }
    };
    String st = gen.getDOT(startState);
    log.info(st);
}

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