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Calc.java
Package: antlr-2_7_0.zip [view]
Upload User: afrynkmhm
Upload Date: 2007-01-06
Package Size: 1262k
Code Size: 1k
Category:
Compiler program
Development Platform:
Others
- import java.io.*;
- import antlr.CommonAST;
- import antlr.collections.AST;
- import antlr.DumpASTVisitor;
- class Calc {
- public static void main(String[] args) {
- try {
- CalcLexer lexer = new CalcLexer(new DataInputStream(System.in));
- CalcParser parser = new CalcParser(lexer);
- // Parse the input expression
- parser.expr();
- CommonAST t = (CommonAST)parser.getAST();
- // Print the resulting tree out in LISP notation
- System.out.println(t.toStringList());
- CalcTreeWalker walker = new CalcTreeWalker();
- // Traverse the tree created by the parser
- walker.expr(t);
- t = (CommonAST)walker.getAST();
- System.out.println(t.toStringList());
- } catch(Exception e) {
- System.err.println("exception: "+e);
- }
- }
- }