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创建解析树请帮我这个问题: 我做网页上的例子:http://www.antlr.org/wiki/pages/viewpage.action?pageId=1760请帮我从Java和ANTLR
为了使用这个例子中,我已经建立了语法P于ANTLRWork 1.4和生成代码以获得类PLexer
和PParser
。 但是,当我在Java的运行这段代码在Jcreator 4.5:
import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;
import org.antlr.runtime.debug.*;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.CharStream;
import ParserAndLexer.*;
public class TestP {
public static void main (String[] args) throws Exception{
ANTLRInputStream input=new ANTLRInputStream(System.in);
PLexer lexer=new PLexer(input);
CommonTokenStream tokens=new CommonTokenStream(lexer);
ParseTreeBuilder builder=new ParseTreeBuilder("prog");
PParser parser=new PParser(tokens,builder);
parser.prog();
System.out.println(builder.getTree().toStringTree());
}
}
错误出现:
D:\CAO HOC\TAI LIEU THAM KHAO\ANTLR-EBNF\CREATE PARSTREE\TestP.java:14:
cannot find symbol
symbol : constructor PParser(org.antlr.runtime.CommonTokenStream,org.antlr.runtime.debug.ParseTreeBuilder)
location: class ParserAndLexer.PParser
PParser parser=new PParser(tokens,builder);
当我在PParser(tokens,builder)
下降一个参数builder
那么这个错误不找到。但我不知道该怎么办好有以下结果:
java TestP
int i;
i=4;
(<grammar prog> (prog (decl (type int) i ;) (stat i = (expr 4))))