Example usage for org.antlr.v4 Tool parseGrammarFromString

Introduction

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

Prototype

public GrammarRootAST parseGrammarFromString(String grammar) 

Source Link

Usage

From source file:org.opencypher.tools.grammar.Antlr4TestUtils.java

License:Apache License

private static Grammar createGrammar(String resource, org.opencypher.grammar.Grammar.ParserOption... options) {
    // We need to do some custom post-processing to get the lexer rules right
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    String grammarString = null;//from ww w .j av a2s . co m
    try {
        Antlr4.write(Fixture.grammarResource(Antlr4.class, resource, options), out);
        grammarString = out.toString(UTF_8.name());
        System.out.println(grammarString);
    } catch (Throwable t) {
        t.printStackTrace();
        fail("Unexpected error while writing antlr grammar");
    }

    org.antlr.v4.Tool tool = new org.antlr.v4.Tool();

    GrammarRootAST ast = tool.parseGrammarFromString(grammarString);
    Grammar grammar = tool.createGrammar(ast);
    tool.process(grammar, false);
    return grammar;
}

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