AstGen.java 文件源码

public static ArrobaParser.CompilationUnitContext makeAst(String fileName) {
    try {
        ANTLRFileStream fileStream = new ANTLRFileStream(fileName);
        ArrobaLexer lexer = new ArrobaLexer(fileStream);
        CommonTokenStream tokenStream = new CommonTokenStream(lexer);
        ArrobaParser parser = new ArrobaParser(tokenStream);
        parser.setBuildParseTree(true);
        return parser.compilationUnit();
    } catch (IOException e) {
        System.err.println("fatal error: could not open file: " + fileName);
        //e.printStackTrace();
        return null;
    }
}