*/
public abstract class JS {
-
- // Static Methods //////////////////////////////////////////////////////////////////////
-
- private static Hashtable currentFunction = new Hashtable();
- public static Function getCurrentFunction() { return (Function)currentFunction.get(Thread.currentThread()); }
- public static String getCurrentFunctionSourceName() { return getCurrentFunctionSourceName(Thread.currentThread()); }
- public static String getFileAndLine() { return getCurrentFunctionSourceName() + ":" + getCurrentFunction().getLine(); }
- public static String getCurrentFunctionSourceName(Thread t) {
- Function f = (Function)currentFunction.get(t);
- if (f == null) return "null";
- return f.getSourceName();
- }
+ // Public Helper Methods //////////////////////////////////////////////////////////////////////
public static boolean toBoolean(Object o) {
if (o == null) return false;
public Object getObject() { return js; }
}
- /** A JavaScript Array */
- public static class Array extends Obj {
- private Vec vec = new Vec();
- public Array() { }
- public Array(int size) { vec.setSize(size); }
- private static int intVal(Object o) {
- if (o instanceof Number) {
- int intVal = ((Number)o).intValue();
- if (intVal == ((Number)o).doubleValue()) return intVal;
- return Integer.MIN_VALUE;
- }
- if (!(o instanceof String)) return Integer.MIN_VALUE;
- String s = (String)o;
- for(int i=0; i<s.length(); i++) if (s.charAt(i) < '0' || s.charAt(i) > '9') return Integer.MIN_VALUE;
- return Integer.parseInt(s);
- }
- public Object get(Object key) throws JS.Exn {
- // FIXME: HACK!
- if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
- if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
- if (key.equals("length")) return new Long(vec.size());
- int i = intVal(key);
- if (i == Integer.MIN_VALUE) return super.get(key);
- try {
- return vec.elementAt(i);
- } catch (ArrayIndexOutOfBoundsException e) {
- return null;
- }
- }
- public void put(Object key, Object val) {
- if (key.equals("length")) vec.setSize(toNumber(val).intValue());
- int i = intVal(key);
- if (i == Integer.MIN_VALUE) super.put(key, val);
- else {
- if (i >= vec.size()) vec.setSize(i+1);
- vec.setElementAt(val, i);
- }
- }
- public Object[] keys() {
- Object[] sup = super.keys();
- Object[] ret = new Object[vec.size() + 1 + sup.length];
- System.arraycopy(sup, 0, ret, vec.size(), sup.length);
- for(int i=0; i<vec.size(); i++) ret[i] = new Integer(i);
- ret[vec.size()] = "length";
- return ret;
- }
- public void setSize(int i) { vec.setSize(i); }
- public int length() { return vec.size(); }
- public Object elementAt(int i) { return vec.elementAt(i); }
- public void addElement(Object o) { vec.addElement(o); }
- public void setElementAt(Object o, int i) { vec.setElementAt(o, i); }
- }
-
- /** Anything that is callable */
- public static class Function extends Obj {
- ByteCodeBlock bytecodes;
- int line;
- String sourceName;
- Scope parentScope;
- public Function(int line, String sourceName, ByteCodeBlock bytecodes, Scope parentScope) {
- this.sourceName = sourceName;
- this.line = line;
- this.bytecodes = bytecodes;
- this.parentScope = parentScope;
- }
- public Function cloneWithNewParentScope(Scope s) {
- if (this.getClass() != Function.class)
- throw new Error("org.xwt.js.JS.Function.cloneWithNewParentScope() is not valid for subclasses");
- return new Function(line, sourceName, bytecodes, s);
- }
- public String getSourceName() throws JS.Exn { return sourceName; }
- public int getLine() throws JS.Exn { return line; }
- public Object _call(JS.Array args) throws JS.Exn, ByteCodeBlock.ControlTransferException {
- if (bytecodes == null) throw new Error("tried to call() a JS.Function with bytecodes == null");
- Context cx = Context.getContextForCurrentThread();
- int size = cx.stack.size();
- cx.stack.push(new Context.CallMarker());
- cx.stack.push(args);
- bytecodes.eval(args == null ? parentScope : new FunctionScope(sourceName, parentScope));
- Object ret = cx.stack.pop();
- if (cx.stack.size() > size) {
- Log.log(this, "warning, stack grew by " + (cx.stack.size() - size) +
- " elements during call to " + getSourceName() + ":" + getLine());
- Log.log(this, "top element is " + cx.stack.peek());
- }
- return ret;
- }
- public final Object call(JS.Array args) throws JS.Exn {
- Function saved = (Function)currentFunction.get(Thread.currentThread());
- if (!getSourceName().equals("java")) currentFunction.put(Thread.currentThread(), this);
- try {
- return _call(args);
- } catch (ByteCodeBlock.ReturnException e) { // ignore
- return e.retval;
- } catch (ByteCodeBlock.ControlTransferException e) {
- throw new RuntimeException(getSourceName() + ":" + getLine() +
- " error, ControlTransferException tried to leave a function");
- } finally {
- if (saved == null) currentFunction.remove(Thread.currentThread());
- else currentFunction.put(Thread.currentThread(), saved);
- }
- }
- }
-
- public static Function parse(Reader r, String sourceName, int line) throws IOException {
- ByteCodeBlock b = new ByteCodeBlock(line, sourceName);
- Parser p = new Parser(r, sourceName, line);
- try {
- while(true) {
- int size = b.size();
- p.parseStatement(false, b);
- if (size == b.size()) break;
- }
- b.add(Tokens.RETURN);
- return new Function(line, sourceName, b, null);
- } catch (Exception e) {
- if (Log.on) Log.log(Parser.class, e);
- return null;
- }
- }
-
/** Any object which becomes part of the scope chain must support this interface */
public static class Scope extends Obj {
private Scope parentScope;
else super.put(s, NULL);
}
}
+
+ public static CompiledFunction parse(String sourceName, int firstLine, Reader sourceCode, JS.Scope parentScope) throws IOException {
+ return new CompiledFunction(sourceName, firstLine, sourceCode, parentScope);
+ }
- private class FunctionScope extends JS.Scope {
- String sourceName;
- public FunctionScope(String sourceName, Scope parentScope) { super(parentScope); this.sourceName = sourceName; }
- 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);
- }
+ /** anything that is callable with the () operator */
+ public static abstract class Callable extends JS.Obj {
+ public abstract Object call(Array args) throws JS.Exn;
}
+
}
projects / org.ibex.core.git / blobdiff