// 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;

public abstract class JSNumber extends JSPrimitive {
    public boolean equals(Object o) {
        if(o == this) return true;
        if(o instanceof JSNumber) {
            JSNumber n = (JSNumber) o;
            if(this instanceof D || n instanceof D) return n.toDouble() == toDouble();
            return n.toLong() == toLong();
        } else if(o instanceof JSString) {
            String s = ((JSString)o).s.trim();
            try {
                if(this instanceof D || s.indexOf('.') != -1) return Double.parseDouble(s) == toDouble();
                return Long.parseLong(s) == toLong();
            } catch(NumberFormatException e) {
                return false;
            }
        } else {
            return false;
        }
    }
    // FEATURE: Better hash function? (if d != (int) d then do something double specific)
    public int hashCode() { return toInt(); }
    
    abstract int toInt();
    long toLong() { return toInt(); }
    boolean toBoolean() { return toInt() != 0; }
    double toDouble() { return toLong(); }
    float toFloat() { return (float) toDouble(); }
    
    final static class I extends JSNumber {
        final int i;
        I(int i) { this.i = i; }
        int toInt() { return i; }
        public String coerceToString() { return Integer.toString(i); }
    }
    
    final static class L extends JSNumber {
        private final long l;
        L(long l) { this.l = l; }
        int toInt() { return (int) l; }
        long toLong() { return l; }
        public String coerceToString() { return Long.toString(l); }
    }
    
    final static class D extends JSNumber {
        private final double d;
        D(double d) { this.d = d; }
        int toInt() { return (int) d; }
        long toLong() { return (long) d; }
        double toDouble()  { return d; }
        boolean toBoolean() { return d == d && d != 0.0; }
        public String coerceToString() { return d == (long) d ? Long.toString((long)d) : Double.toString(d); }
    }
    
    final static class B extends JSNumber {
        private final boolean b;
        B(boolean b) { this.b = b; }
        int toInt() { return b ? 1 : 0; }
        public String coerceToString() { return b ? "true" : "false"; }
    }
}