- public Object eval(final JS.Scope s, Parser.Thread t) throws ControlTransferException {
- for(int i=0; i<size; i++)
- switch(op[i]) {
- case arithmetic: break;
- case LITERAL:
- t.push(arg[i]);
- break;
- case OBJECT: t.push(new JS.Obj()); break;
- case ARRAY: t.push(new JS.Array(toNumber(arg[i]).intValue())); break;
- case DECLARE: s.declare(arg[i] == NO_ARG ? (String)t.pop() : (String)arg[i]); break;
- case THIS: t.push(s); break; // FIXME: transparents
- case ASSERT: if (!toBoolean(t.pop())) throw new EvaluatorException("assertion failed"); break;
- case THROW: throw new JS.Exn(t.pop());
- case JT: if (toBoolean(t.pop())) i += toNumber(arg[i]).intValue() - 1; break;
- case JF: if (!toBoolean(t.pop())) i += toNumber(arg[i]).intValue() - 1; break;
- case JMP: i += toNumber(arg[i]).intValue() - 1; break;
- case POP: t.pop(); break;
- case SWAP: t.swap(); break;
- case DUP: t.push(t.peek()); break;
-
- case Lexer.BREAK: {
- // FIXME: make sure this can only appear in proper places
- return Boolean.FALSE;
- }
- case Lexer.CONTINUE: {
- // FIXME: make sure this can only appear in proper places
- return Boolean.TRUE;
- }
- case LOOP: {
- ByteCode loop = (ByteCode)arg[i];
- Parser.Thread t2 = new Parser.Thread();
- t2.push(Boolean.TRUE);
- while (true) {
- Boolean result;
- try {
- result = (Boolean)loop.eval(new JS.Scope(s), t2);
- } catch (ContinueException c) {
- result = Boolean.TRUE;
- } catch (BreakException b) {
- result = Boolean.FALSE;
- }
- if (result == Boolean.FALSE) break;
- t2 = new Parser.Thread();
- t2.push(Boolean.FALSE);
- }
- break;
- }
-
- case PUT: {
- Object val = arg[i] == NO_ARG ? t.pop() : arg[i];
- Object key = t.pop();
- ((JS)t.peek()).put(key, val);
- t.push(val);
- break;
- }
-
- case GET: {
- Object v = arg[i] == NO_ARG ? t.pop() : arg[i];
- Object o = t.pop();
- t.push(doGet(o, v));
- break;
- }
- case GET_PRESERVE: {
- Object v = t.pop();
- Object o = t.peek();
- t.push(v);
- t.push(doGet(o, v));
- break;
- }
- case NOP: break;
-
- case EXPR: t.push(((Expr)arg[i]).eval(s)); break;
- case SCOPE: t.push(((Expr)arg[i]).eval(new JS.Scope(s))); break;
-
- case CALL:
- JS.Array arguments = new JS.Array();
- int numArgs = toNumber(arg[i]).intValue();
- arguments.setSize(numArgs);
- for(int j=numArgs - 1; j >= 0; j--) arguments.setElementAt(t.pop(), j);
- JS.Function f = (JS.Function)t.pop();
- if (f == null) throw new JS.Exn(new EvaluatorException("attempted to call null"));
- t.push(f.call(arguments));
- break;
-
- case FUNCTION: {
- final ByteCode myBytes = (ByteCode)arg[i];
- t.push(new JS.Function() {
- public String toString() { return sourceName + ":" + line; }
- public String getSourceName() throws JS.Exn { return sourceName; }
- public Object _call(final JS.Array args) throws JS.Exn {
- Function save = JS.getCurrentFunction();
- JS.currentFunction.put(java.lang.Thread.currentThread(), this);
- JS.Scope scope = new JS.Scope(s) {
- // FIXME
- public String getSourceName() { return sourceName; }
- public Object get(Object key) throws JS.Exn {
- if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
- else if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
- return super.get(key);
- }
- };
- Parser.Thread t0 = new Parser.Thread();
- t0.push(args);
- try {
- return myBytes.eval(scope, t0);
- } catch (ReturnException r) {
- return r.retval;
- } catch (ControlTransferException c) {
- throw new EvaluatorException("error, ControlTransferException tried to leave a function: " + c);
- } finally {
- if (save == null) JS.currentFunction.remove(java.lang.Thread.currentThread());
- else JS.currentFunction.put(java.lang.Thread.currentThread(), save);
- }
- }
- });
- break;
- }
-
- case RETURN: break;
- case TRY: break;
- case INSTANCEOF: break;
- case TYPEOF: break;
- case FOR__IN: break;
-
- case Lexer.BITNOT: t.push(new Long(~toLong(t.pop()))); break;
- case Lexer.BANG: t.push(new Boolean(!toBoolean(t.pop()))); break;
-
- case Lexer.INC: case Lexer.DEC: {
- boolean isPrefix = toBoolean(arg[i]);
- Object key = t.pop();
- JS obj = (JS)t.pop();
- Number num = toNumber(obj.get(key));
- Number val = new Double(op[i] == Lexer.INC ? num.doubleValue() + 1.0 : num.doubleValue() - 1.0);
- obj.put(key, val);
- t.push(isPrefix ? val : num);
- break;
- }
-
- default: {
- Object right = t.pop();
- Object left = t.pop();
- switch(op[i]) {
-
- case Lexer.BITOR: t.push(new Long(toLong(left) | toLong(right))); break;
- case Lexer.BITXOR: t.push(new Long(toLong(left) ^ toLong(right))); break;
- case Lexer.BITAND: t.push(new Long(toLong(left) & toLong(right))); break;
-
- case Lexer.ADD: {
- Object l = left;
- Object r = right;
- if (l instanceof String || r instanceof String) {
- if (l == null) l = "null";
- if (r == null) r = "null";
- if (l instanceof Number && ((Number)l).doubleValue() == ((Number)l).longValue())
- l = new Long(((Number)l).longValue());
- if (r instanceof Number && ((Number)r).doubleValue() == ((Number)r).longValue())
- r = new Long(((Number)r).longValue());
- t.push(l.toString() + r.toString()); break;
- }
- t.push(new Double(toDouble(l) + toDouble(r))); break;
- }
-
- case Lexer.SUB: t.push(new Double(toDouble(left) - toDouble(right))); break;
- case Lexer.MUL: t.push(new Double(toDouble(left) * toDouble(right))); break;
- case Lexer.DIV: t.push(new Double(toDouble(left) / toDouble(right))); break;
- case Lexer.MOD: t.push(new Double(toDouble(left) % toDouble(right))); break;
-
- case Lexer.LSH: t.push(new Long(toLong(left) << toLong(right))); break;
- case Lexer.RSH: t.push(new Long(toLong(left) >> toLong(right))); break;
- case Lexer.URSH: t.push(new Long(toLong(left) >>> toLong(right))); break;
-
- // FIXME: these need to work on strings
- case Lexer.LT: t.push(toDouble(left) < toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.LE: t.push(toDouble(left) <= toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GT: t.push(toDouble(left) > toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GE: t.push(toDouble(left) >= toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
-
- case Lexer.EQ:
- case Lexer.NE: {
- // FIXME: should use Javascript coercion-equality rules
- Object l = left;
- Object r = right;
- boolean ret;
- if (l == null) { Object tmp = r; r = l; l = tmp; }
- if (l == null && r == null) ret = true;
- else if (l instanceof Boolean) ret = new Boolean(toBoolean(r)).equals(l);
- else if (l instanceof Number) ret = toNumber(r).doubleValue() == toNumber(l).doubleValue();
- else if (l instanceof String) ret = r != null && l.equals(r.toString());
- else ret = l.equals(r);
- t.push(new Boolean(op[i] == Lexer.EQ ? ret : !ret)); break;
- }