X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fxwt%2Fjs%2FExpr.java;h=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hb=4e8351f507d2e421dab06896b72a58f1a4033094;hp=1458186f75a6c45575e8aa568a4c11d3bade3fe5;hpb=285e9d390fbe7562289dd2339d1e5da09f9fe669;p=org.ibex.core.git

diff --git a/src/org/xwt/js/Expr.java b/src/org/xwt/js/Expr.java
index 1458186..e69de29 100644
--- a/src/org/xwt/js/Expr.java
+++ b/src/org/xwt/js/Expr.java
@@ -1,302 +0,0 @@
-// Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
-package org.xwt.js;
-
-import java.io.*;
-import org.xwt.util.*;
-
-/** sorta like gcc trees */
-public class Expr {
-    int code = -1;
-    
-    final Expr left;
-    final Expr right;
-    Expr next = null;   // if this expr is part of a list
-    
-    String string = null;
-    Number number = null;
-    
-    public String toString() { return toString(0); }
-    public String toString(int indent) {
-	String ret = "";
-	for(int i=0; i<indent; i++) ret += " ";
-	ret += Lexer.codeToString[code];
-	if (code == Lexer.NUMBER) ret += " " + number;
-	else if (string != null) ret += " \"" + string + "\"";
-	ret += "\n";
-	if (left != null) ret += left.toString(indent + 2);
-	if (right != null) ret += right.toString(indent + 2);
-	if (next != null) ret += next.toString(indent);
-	return ret;
-    }
-    
-    public Expr(String s) { this(Lexer.STRING); this.string = s; }  // an identifier or label
-    public Expr(int code, String s) { this(code); this.string = s; }
-    public Expr(Number n) { this(Lexer.NUMBER); this.number = n; }  // an identifier or label
-    public Expr(int code) { this(code, null, null); }
-    public Expr(int code, Expr left) { this(code, left, null); }
-    public Expr(int code, Expr left, Expr right) { this.code = code; this.left = left; this.right = right; }
-
-    public static Number toNumber(Object o) {
-	if (o == null) return new Long(0);
-	if (o instanceof Number) return ((Number)o);
-	if (o instanceof String) return new Double((String)o);
-	if (o instanceof Boolean) return ((Boolean)o).booleanValue() ? new Long(1) : new Long(0);
-	if (o instanceof JS) return ((JS)o).coerceToNumber();
-	throw new Error("toNumber() got object of type " + o.getClass().getName());
-    }
- 
-    public static double toDouble(Object o) { return toNumber(o).doubleValue(); }
-    public static long toLong(Object o) { return toNumber(o).longValue(); }
-    public static boolean toBoolean(Object o) {
-	if (o == null) return false;
-	if (o instanceof Boolean) return ((Boolean)o).booleanValue();
-	if (o instanceof Number) return o.equals(new Integer(0));
-	return true;
-    }
-
-    public Object eval(final JS.Scope s) throws ControlTransferException, JS.Exn {
-	switch(code) {
-
-	case Lexer.BITOR: return new Long(toLong(left.eval(s)) | toLong(right.eval(s)));
-	case Lexer.BITXOR: return new Long(toLong(left.eval(s)) ^ toLong(right.eval(s)));
-	case Lexer.BITAND: return new Long(toLong(left.eval(s)) & toLong(right.eval(s)));
-	case Lexer.BITNOT: return new Long(~toLong(left.eval(s)));
-
-	case Lexer.ADD: {
-	    Object l = left.eval(s);
-	    Object r = right.eval(s);
-	    if (l instanceof String || r instanceof String) return l.toString() + r.toString();
-	    return new Double(toDouble(l) + toDouble(r));
-	}
-
-	case Lexer.SUB: return new Double(toDouble(left.eval(s)) - toDouble(right.eval(s)));
-	case Lexer.MUL: return new Double(toDouble(left.eval(s)) * toDouble(right.eval(s)));
-	case Lexer.DIV: return new Double(toDouble(left.eval(s)) / toDouble(right.eval(s)));
-	case Lexer.MOD: return new Double(toDouble(left.eval(s)) % toDouble(right.eval(s)));
-
-	case Lexer.LSH: return new Long(toLong(left.eval(s)) << toLong(right.eval(s)));
-	case Lexer.RSH: return new Long(toLong(left.eval(s)) >> toLong(right.eval(s)));
-	case Lexer.URSH: return new Long(toLong(left.eval(s)) >>> toLong(right.eval(s)));
-
-	case Lexer.LT: return toDouble(left.eval(s)) < toDouble(right.eval(s)) ? Boolean.TRUE : Boolean.FALSE;
-	case Lexer.LE: return toDouble(left.eval(s)) <= toDouble(right.eval(s)) ? Boolean.TRUE : Boolean.FALSE;
-	case Lexer.GT: return toDouble(left.eval(s)) > toDouble(right.eval(s)) ? Boolean.TRUE : Boolean.FALSE;
-	case Lexer.GE: return toDouble(left.eval(s)) >= toDouble(right.eval(s)) ? Boolean.TRUE : Boolean.FALSE;
-
-	case Lexer.OR: return new Boolean(toBoolean(left.eval(s)) || toBoolean(right.eval(s)));
-	case Lexer.AND: return new Boolean(toBoolean(left.eval(s)) && toBoolean(right.eval(s)));
-
-	case Lexer.EQ:
-	case Lexer.NE: {
-	    // FIXME: should use Javascript coercion-equality rules
-	    boolean ret = left.eval(s).equals(right.eval(s));
-	    return new Boolean(code == Lexer.EQ ? ret : !ret);
-	}
-
-	case Lexer.INC:
-	case Lexer.DEC:
-	case Lexer.ASSIGN: {
-	    Object v = (code == Lexer.ASSIGN) ? right.eval(s) : new Double(toDouble(left.eval(s)) + (code == Lexer.INC ? 1 : -1));
-	    if (left.code == Lexer.DOT) {
-		Object o = left.left.eval(s);
-		if (o instanceof String) {
-		    throw new Error("can't set properties on a String");
-		} else if (o instanceof Number) {
-		    throw new Error("can't set properties on a Number");
-		} else if (o instanceof Boolean) {
-		    throw new Error("can't set properties on a Boolean");
-		} else {
-		    ((JS)left.left.eval(s)).put(left.right.eval(s), v);
-		    return v;
-		}
-	    } else {
-		s.put(left.string, v);
-		return v;
-	    }
-	}
-
-	case Lexer.TYPEOF: {
-	    Object o = left.eval(s);
-	    if (o == null) return "null";
-	    if (o.getClass() == String.class) return "string";
-	    if (o.getClass() == Boolean.class) return "boolean";
-	    if (o instanceof Number) return "number";
-	    if (o instanceof JS.Array) return "array";
-	    if (o instanceof JS) return "object";
-	    throw new Error("typeof " + o.getClass().getName() + " unknown");
-	}
-
-	case Lexer.NUMBER: return number;
-	case Lexer.STRING: return string;
-
-	case Lexer.NULL: return null;
-	case Lexer.THIS: return s;
-	case Lexer.FALSE: return Boolean.FALSE;
-	case Lexer.TRUE: return Boolean.TRUE;
-	case Lexer.ASSERT: if (!toBoolean(left.eval(s))) throw new Error("assertion failed");
-	case Lexer.THROW: throw new JS.Exn(left.eval(s));
-
-	case Lexer.NAME: return s.get(string);
-	case Lexer.DOT: {
-	    Object o = left.eval(s);
-	    Object v = right.eval(s);
-	    if (o instanceof String) {
-		if (v.equals("length")) return new Integer(((String)o).length());
-		throw new Error("Not Implemented: properties on String objects");
-	    } else if (o instanceof Boolean) {
-		throw new Error("Not Implemented: properties on Boolean objects");
-	    } else if (o instanceof Number) {
-		throw new Error("Not Implemented: properties on Number objects");
-	    } else if (o instanceof JS) {
-		return ((JS)o).get(v);
-	    }
-	}
-
-	case Lexer.TRY: {
-	    boolean safeToExit = false;
-	    try {
-		Object ret = left.eval(s);
-		safeToExit = true;
-		return ret;
-	    } catch (JS.Exn e) {
-		Expr c = right;
-		if (c.code == Lexer.CATCH) {
-		    JS.Scope scope = new JS.Scope(s);
-		    s.put(c.left.string, e);
-		    c.right.eval(scope);
-		    c = c.next;
-		}
-		if (c.code == Lexer.FINALLY) {
-		    JS.Scope scope = new JS.Scope(s);
-		    c.left.eval(scope);
-		}
-	    } finally {
-		if (!safeToExit) Log.log(this, "WARNING: Java exception penetrated a JavaScript try{} block");
-	    }
-	    return null;
-	}
-
-	case Lexer.LP:
-	    JS.Function f = (JS.Function)left.eval(s);
-	    JS.Array arguments = new JS.Array();
-	    for(Expr e = right; e != null; e = e.next) arguments.addElement(e.eval(s));
-	    return f.call(arguments);
-	    
-	case Lexer.FUNCTION:
-	    return new JS.ObjFunction() {
-		    public JS.Scope getParentScopeOfDeclaration() { return s; }
-		    public Object call(JS.Array args) throws JS.Exn {
-			JS.Scope scope = new JS.Scope(getParentScopeOfDeclaration()) {
-				public Object get(Object key) throws JS.Exn {
-				    if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
-				    return super.get(key);
-				}
-			    };
-			// FIXME
-			args.put("cascade", org.xwt.Trap.cascadeFunction);
-			scope.put("arguments", args);
-			int i = 0;
-			for(Expr e = left; e != null; e = e.next) scope.put(e.string, args.get(new Integer(i++)));
-			try {
-			    return right.eval(scope);
-			} catch (ReturnException r) {
-			    return r.retval;
-			} catch (ControlTransferException c) {
-			    throw new Error("error, ControlTransferException tried to leave a function: " + c);
-			}
-		    }
-		};
-
-	case Lexer.FOR:
-	    Object[] keys = ((JS)left.right.eval(s)).enumerateProperties();
-	    try {
-		for(int i=0; i<keys.length; i++) {
-		    JS.Scope scope = new JS.Scope(s);
-		    scope.put(left.left.string, keys[i]);
-		    try {
-			right.eval(scope);
-		    } catch (ContinueException c) { /* FIXME: handle labels */ }
-		}
-	    } catch (BreakException b) { /* FIXME: handle labels */ }
-	    return null;
-
-	case Lexer.SWITCH:
-	    Object switchVal = left.eval(s);
-	    boolean go = false;
-	    try {
-		for(Expr e = right; e != null; e = e.next) {
-		    if (go || e.code == Lexer.DEFAULT || e.left.eval(s).equals(switchVal)) go = true;
-		    if (go) e.right.eval(s);
-		}
-	    } catch (BreakException b) { /* FIXME: handle labels */ }
-	    return null;
-
-	case Lexer.LB: {
-	    JS.Array ret = new JS.Array();
-	    for(Expr e = left; e != null; e = e.next) ret.addElement(e.eval(s));
-	    return ret;
-	}
-	    
-	case Lexer.LC: // block
-	    for(Expr e = left; e != null; e = e.next) e.eval(s);
-	    return null;
-	    
-	case Lexer.RC: {   // Object ctor
-	    JS.Obj ret = new JS.Obj();
-	    for(Expr e = left; e != null; e = e.next)
-		ret.put(e.left.string, e.right.eval(s));
-	    return ret;
-	}
-	    
-	case Lexer.VAR:
-	    for(Expr e = left; e != null; e = e.next)
-		if (e.code == Lexer.NAME) {
-		    s.declare(e.string);
-		} else {
-		    s.declare(e.left.string);
-		    e.eval(s);
-		}
-	    return null;
-
-	case Lexer.HOOK: return toBoolean(left.eval(s)) ? right.left.eval(s) : right.right.eval(s);
-	case Lexer.IF: return toBoolean(left.eval(s)) ? right.left.eval(s) : right.right.eval(s);
-
-	case Lexer.BREAK: throw new BreakException(string);
-	case Lexer.CONTINUE: throw new ContinueException(string);
-	case Lexer.RETURN: throw new ReturnException(left == null ? null : left.eval(s));
-
-	case Lexer.WHILE:
-	case Lexer.DO:
-	    try {
-		boolean first = true;
-		while((first && code == Lexer.DO) || toBoolean(left.eval(s))) {
-		    first = false;
-		    try { right.eval(s); }
-		    catch (ContinueException e) {
-			if (e.label != null && !e.label.equals(string)) throw e;
-		    }
-		}
-	    } catch (BreakException e) {
-		if (e.label != null && !e.label.equals(string)) throw e;
-	    }
-	    return null;
-
-	default: throw new Error("don't know how to eval an Expr with code " + Lexer.codeToString[code]);
-	}
-    }
-
-    private static abstract class ControlTransferException extends Exception { }
-    private static class BreakException extends ControlTransferException {
-	public String label;
-	BreakException(String label) { this.label = label; }
-    }
-    private static class ContinueException extends ControlTransferException {
-	public String label;
-	ContinueException(String label) { this.label = label; }
-    }
-    private static class ReturnException extends ControlTransferException {
-	public Object retval;
-	ReturnException(Object retval) { this.retval = retval; }
-    }
-}
-