// Copyright 2000-2005 the Contributors, as shown in the revision logs.
// Licensed under the Apache Public Source License 2.0 ("the License").
// You may not use this file except in compliance with the License.

package org.ibex.js; 

import org.ibex.util.*;
import java.io.*;

/** An exception which can be thrown and caught by JavaScript code */
public class JSExn extends Exception { 
    private Basket.List backtrace = new Basket.Array();
    private JS js; 
    public JSExn(String s) { this(JSU.S(s)); }
    public JSExn(JS js) { this(js,null); }
    public JSExn(JS js, Interpreter cx) { this.js = js; fill(cx); }
    
    private void fill(Interpreter cx) {
        if(cx == null) cx = Interpreter.current();
        if(cx == null) return;
        addBacktrace(cx.f.sourceName + ":" + cx.f.line[cx.pc]);
        cx.stack.backtrace(this);
    }
    public void printStackTrace() { printStackTrace(System.err); }
    public void printStackTrace(PrintWriter pw) {
        for(int i=0; i<backtrace.size(); i++) pw.println("    at " + (String) backtrace.get(i));
        super.printStackTrace(pw);
    }
    public void printStackTrace(PrintStream ps) {
        for(int i=0; i<backtrace.size(); i++) ps.println("    at " + (String) backtrace.get(i));
        super.printStackTrace(ps);
    }
    public String toString() { return "JSExn: " + JSU.str(js); }
    public String getMessage() { return toString(); }
    public JS getObject() { return js; } 
    
    void addBacktrace(String line) { backtrace.add(line); }
    
    public static class Wrapper extends RuntimeException {
        public final JSExn e;
        public Wrapper(JSExn e) { this.e = e; }
        public JSExn unwrap() {
            e.addBacktrace("[foreign code]");
            e.fill(null);
            return e;
        }
    }
    
    public static class IO extends JSExn {
        public IO(java.io.IOException ioe) {
            super("ibex.io: " + ioe.toString());
            JSU.warn(ioe);
        }
    }
}