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
|
import java.io.*;
import antlr.CommonAST;
import antlr.collections.AST;
class Main {
public static void main(String[] args) {
new INTNode();
try {
CalcLexer lexer = new CalcLexer(new DataInputStream(System.in));
CalcParser parser = new CalcParser(lexer);
// Parse the input expression
parser.expr();
CalcAST t = (CalcAST)parser.getAST();
// Print the resulting tree out in LISP notation
System.out.println(t.toStringTree());
// XML serialize the tree, showing
// different physical node class types
Writer w = new OutputStreamWriter(System.out);
t.xmlSerialize(w);
w.write("\n");
w.flush();
// Compute value and return
int r = t.value();
System.out.println("value is "+r);
} catch(Exception e) {
System.err.println("exception: "+e);
e.printStackTrace();
}
}
}
|
