1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
import java.io.*;
import antlr.collections.AST;
import antlr.collections.impl.*;
import antlr.debug.misc.*;
import antlr.*;
class Main {
// Define a selector that can handle nested include files.
// These variables are public so the parser/lexer can see them.
public static TokenStreamSelector selector = new TokenStreamSelector();
public static PParser parser;
public static PLexer mainLexer;
public static void main(String[] args) {
try {
// open a simple stream to the input
DataInputStream input = new DataInputStream(System.in);
// attach java lexer to the input stream,
mainLexer = new PLexer(input);
// notify selector about starting lexer; name for convenience
selector.addInputStream(mainLexer, "main");
selector.select("main"); // start with main P lexer
// Create parser attached to selector
parser = new PParser(selector);
// Parse the input language: P
parser.setFilename("<stdin>");
parser.startRule();
}
catch(Exception e) {
System.err.println("exception: "+e);
e.printStackTrace(System.err); // so we can get stack trace
}
}
}
|
