154 lines
4.2 KiB
Java
154 lines
4.2 KiB
Java
class JSObject extends JSValue {
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static JSObject JSUndefined = new JSObject("undefined");
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JSObject(String aValue)
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{
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value = aValue;
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}
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String print(String indent)
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{
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return indent + "JSObject : " + value + "\n";
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}
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void evalLHS(Environment theEnv)
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{
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theEnv.theStack.push(this);
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}
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void eval(Environment theEnv)
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{
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JSValue v = (JSValue)(theEnv.theGlobals.get(value));
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if (v == null) {
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System.out.println("Accessed undefined : " + value);
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theEnv.theStack.push(JSUndefined);
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}
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else
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theEnv.theStack.push(v);
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}
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JSValue defaultValue(String hint) {
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return null; // XXX
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}
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JSValue toPrimitive(String hint) {
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JSValue result = defaultValue(hint);
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if (result instanceof JSObject)
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throw new JSException(new JSString("default value returned object"));
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else
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return result;
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}
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JSBoolean toJSBoolean() {
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return JSBoolean.JSTrue;
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}
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JSDouble toJSDouble() {
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return toPrimitive("Number").toJSDouble();
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}
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void gt(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.gt(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().gt(theEnv);
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}
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}
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void ge(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.ge(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().ge(theEnv);
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}
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}
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void lt(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.lt(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().lt(theEnv);
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}
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}
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void le(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.le(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().le(theEnv);
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}
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}
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void eq(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.eq(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().eq(theEnv);
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}
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}
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void ne(Environment theEnv) {
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JSValue lV = toPrimitive("Number");
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JSValue rV = theEnv.theStack.pop().toPrimitive("Number");
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if ((lV instanceof JSString) && (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.ne(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().ne(theEnv);
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}
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}
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void add(Environment theEnv) {
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JSValue lV = toPrimitive("");
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JSValue rV = theEnv.theStack.pop().toPrimitive("");
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if ((lV instanceof JSString) || (rV instanceof JSString)) {
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theEnv.theStack.push(rV);
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lV.ne(theEnv);
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}
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else {
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theEnv.theStack.push(rV.toJSDouble());
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lV.toJSDouble().add(theEnv);
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}
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}
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void subtract(Environment theEnv) {
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theEnv.theStack.push(theEnv.theStack.pop().toJSDouble());
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toJSDouble().subtract(theEnv);
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}
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public String toString() {
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return value;
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}
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String value;
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} |