Example usage for org.antlr.v4 Tool Tool

Introduction

In this page you can find the example usage for org.antlr.v4 Tool Tool.

Prototype

public Tool() 

Source Link

Usage

From source file:org.opencypher.tools.grammar.Antlr4ToolFacade.java

License:Apache License

public static void assertGeneratesValidParser(String resource) throws Exception {
    Output.Readable buffer = stringBuilder();
    Tool antlr = new Tool();
    Antlr4ToolFacade facade = new Antlr4ToolFacade(antlr, buffer);
    try {/*from  w w w.  j av  a 2 s . c o  m*/
        Antlr4.write(Fixture.grammarResource(Antlr4.class, resource), buffer);
    } catch (Throwable e) {
        try {
            facade.reportFailureIn("generating grammar");
        } catch (AssertionError x) {
            throw e;
        }
    }
    antlr.addListener(facade);
    GrammarRootAST ast = antlr.parse(resource, new ANTLRReaderStream(buffer.reader()));
    if (ast.hasErrors) {
        RuleAST lastGood = lastGoodRule(ast);
        if (lastGood == null) {
            facade.reportFailureIn("parsing grammar");
        } else {
            facade.reportFailureIn(
                    "parsing grammar, after " + lastGood.getRuleName() + " on line " + lastGood.getLine());
        }
    }
    antlr.process(antlr.createGrammar(ast), false);
    if (facade.hasErrors()) {
        facade.reportFailureIn("processing grammar");
    }
}

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