+++ /dev/null
-// Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
-package org.xwt.js;
-
-import org.xwt.util.*;
-import java.io.*;
-
-/** a block of Forth bytecode */
-class ForthBlock implements OpCodes, Tokens {
-
- int line;
- String sourceName;
- int[] op = new int[10];
- Object[] arg = new Object[10];
- int size = 0;
-
- public ForthBlock(int line, String sourceName) { this.line = line; this.sourceName = sourceName; }
- public ForthBlock(int line, String sourceName, int op_, Object arg_) { this(line, sourceName); add(op_, arg_); }
-
- public int size() { return size; }
- public void set(int pos, int op_, Object arg_) { op[pos] = op_; arg[pos] = arg_; }
- public void paste(ForthBlock other) { for(int i=0; i<other.size; i++) add(other.op[i], other.arg[i]); }
- public ForthBlock add(int op_) { return add(op_, null); }
- public ForthBlock add(int op_, Object arg_) {
- if (size == op.length - 1) {
- int[] op2 = new int[op.length * 2]; System.arraycopy(op, 0, op2, 0, op.length); op = op2;
- Object[] arg2 = new Object[op.length * 2]; System.arraycopy(arg, 0, arg2, 0, arg.length); arg = arg2;
- }
- op[size] = op_;
- arg[size] = arg_;
- size++;
- return this;
- }
-
- public Object eval(final JS.Scope s) throws ControlTransferException, JS.Exn { return eval(s, new Stack()); }
- public Object eval(final JS.Scope s, Stack t) throws ControlTransferException {
- for(int i=0; i<size; i++)
- switch(op[i]) {
- case LABEL: break; // FIXME
- case LITERAL: t.push(arg[i]); break;
- case OBJECT: t.push(new JS.Obj()); break;
- case ARRAY: t.push(new JS.Array(JS.toNumber(arg[i]).intValue())); break;
- case DECLARE: s.declare((String)t.pop()); break;
- case THIS: t.push(s); break; // FIXME: transparents
- case JT: if (JS.toBoolean(t.pop())) i += JS.toNumber(arg[i]).intValue() - 1; break;
- case JF: if (!JS.toBoolean(t.pop())) i += JS.toNumber(arg[i]).intValue() - 1; break;
- case JMP: i += JS.toNumber(arg[i]).intValue() - 1; break;
- case POP: t.pop(); break;
- case SWAP: t.swap(); break;
- case DUP: t.push(t.peek()); break;
- case NOP: break;
- case EXPR: t.push(((ForthBlock)arg[i]).eval(s)); break;
- case SCOPE: t.push(((ForthBlock)arg[i]).eval(new JS.Scope(s))); break;
-
- case ASSERT: if (!JS.toBoolean(t.pop())) throw new EvaluatorException(line, sourceName, "assertion failed"); break;
- case RETURN: throw new ReturnException(t.pop());
- case THROW: throw new JS.Exn(t.pop());
-
- case TRY: break;
- case INSTANCEOF: break;
- case TYPEOF: break;
- case PUSHKEYS: {
- Object o = t.peek();
- Object[] keys = ((JS)o).keys();
- JS.Array a = new JS.Array();
- a.setSize(keys.length);
- for(int j=0; j<keys.length; j++) a.setElementAt(keys[j], j);
- t.push(a);
- break;
- }
-
- case Lexer.BITNOT: t.push(new Long(~JS.toLong(t.pop()))); break;
- case Lexer.BANG: t.push(new Boolean(!JS.toBoolean(t.pop()))); 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: {
- ForthBlock loop = (ForthBlock)arg[i];
- Stack t2 = new Stack();
- 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 Stack();
- t2.push(Boolean.FALSE);
- }
- break;
- }
-
- case PUT: {
- Object val = t.pop();
- Object key = t.pop();
- JS target = (JS)t.peek();
- if (target == null) throw new JS.Exn("tried to put a value to the " + key + " property on the null value");
- target.put(key, val);
- t.push(val);
- break;
- }
-
- case GET: {
- Object v = t.pop();
- 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 CALL: {
- JS.Array arguments = new JS.Array();
- int numArgs = JS.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(line, sourceName, "attempted to call null"));
- t.push(f.call(arguments));
- break;
- }
-
- case OpCodes.FUNCTION: {
- final ForthBlock myBytes = (ForthBlock)arg[i];
- t.push(new JS.Function() {
- public String toString() { return sourceName + ":" + line; }
- public String getSourceName() throws JS.Exn { return sourceName; }
- public int getLine() throws JS.Exn { return line; }
- 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);
- }
- };
- Stack t0 = new Stack();
- t0.push(args);
- try {
- return myBytes.eval(scope, t0);
- } catch (ReturnException r) {
- return r.retval;
- } catch (ControlTransferException c) {
- throw new EvaluatorException(line, sourceName, "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 Lexer.INC: case Lexer.DEC: {
- boolean isPrefix = JS.toBoolean(arg[i]);
- Object key = t.pop();
- JS obj = (JS)t.pop();
- Number num = JS.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(JS.toLong(left) | JS.toLong(right))); break;
- case Lexer.BITXOR: t.push(new Long(JS.toLong(left) ^ JS.toLong(right))); break;
- case Lexer.BITAND: t.push(new Long(JS.toLong(left) & JS.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(JS.toDouble(l) + JS.toDouble(r))); break;
- }
-
- case Lexer.SUB: t.push(new Double(JS.toDouble(left) - JS.toDouble(right))); break;
- case Lexer.MUL: t.push(new Double(JS.toDouble(left) * JS.toDouble(right))); break;
- case Lexer.DIV: t.push(new Double(JS.toDouble(left) / JS.toDouble(right))); break;
- case Lexer.MOD: t.push(new Double(JS.toDouble(left) % JS.toDouble(right))); break;
-
- case Lexer.LSH: t.push(new Long(JS.toLong(left) << JS.toLong(right))); break;
- case Lexer.RSH: t.push(new Long(JS.toLong(left) >> JS.toLong(right))); break;
- case Lexer.URSH: t.push(new Long(JS.toLong(left) >>> JS.toLong(right))); break;
-
- // FIXME: these need to work on strings
- case Lexer.LT: t.push(JS.toDouble(left) < JS.toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.LE: t.push(JS.toDouble(left) <= JS.toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GT: t.push(JS.toDouble(left) > JS.toDouble(right) ? Boolean.TRUE : Boolean.FALSE); break;
- case Lexer.GE: t.push(JS.toDouble(left) >= JS.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(JS.toBoolean(r)).equals(l);
- else if (l instanceof Number) ret = JS.toNumber(r).doubleValue() == JS.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;
- }
-
- default: throw new Error("unknown opcode " + op[i]);
- } }
- }
- if (t.size() != 1) {
- for(int i=0; i<size; i++) {
- System.out.println((op[i] >= 0 ? codeToString[op[i]] : "" + op[i]) + " [" + arg[i] + "]");
- }
- throw new EvaluatorException(line, sourceName, "eval() terminated with " + t.size() + " elements on the stack; one expected");
- }
- return t.pop();
- }
-
- public Object doGet(final Object o, final Object v) {
- if (o == null) {
- throw new EvaluatorException(line, sourceName, "tried to get property \"" + v + "\" from the null value");
- }
- if (o instanceof String) {
- if (v.equals("length")) return new Integer(((String)o).length());
- else if (v.equals("substring")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() == 1) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue());
- else if (args.length() == 2) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue(),
- JS.toNumber(args.elementAt(1)).intValue());
- else throw new Error("String.substring() can only take one or two arguments");
- }
- };
- else if (v.equals("toLowerCase")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).toLowerCase();
- } };
- else if (v.equals("toUpperCase")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).toString().toUpperCase();
- } };
- else if (v.equals("charAt")) return new JS.Function() {
- public Object _call(JS.Array args) {
- return ((String)o).charAt(JS.toNumber(args.elementAt(0)).intValue()) + "";
- } };
- else if (v.equals("lastIndexOf")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).lastIndexOf(args.elementAt(0).toString()));
- } };
- else if (v.equals("indexOf")) return new JS.Function() {
- public Object _call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).indexOf(args.elementAt(0).toString()));
- } };
- throw new Error("Not Implemented: propery " + v + " on String objects");
- } else if (o instanceof Boolean) {
- throw new Error("Not Implemented: properties on Boolean objects");
- } else if (o instanceof Number) {
- Log.log(this, "Not Implemented: properties on Number objects");
- return null;
- //throw new Error("Not Implemented: properties on Number objects");
- } else if (o instanceof JS) {
- return ((JS)o).get(v);
- }
- return null;
- }
-
- static class Stack {
- public Object[] os = new Object[256];
- private int size = 0;
- public void push(Object o) { os[size++] = o; }
- public Object pop() { return os[--size]; }
- public Object peek() { return os[size - 1]; }
- public void swap() { Object temp = os[size - 1]; os[size - 1] = os[size - 2]; os[size - 2] = temp; }
- public int size() { return size; }
- }
-
- static class EvaluatorException extends RuntimeException {
- public EvaluatorException(int line, String sourceName, String s) { super(sourceName + ":" + line + " " + s); }
- }
-
- static abstract class ControlTransferException extends Exception { }
- static class BreakException extends ControlTransferException {
- public String label;
- BreakException(String label) { this.label = label; }
- }
- static class ContinueException extends ControlTransferException {
- public String label;
- ContinueException(String label) { this.label = label; }
- }
- static class ReturnException extends ControlTransferException {
- public Object retval;
- ReturnException(Object retval) { this.retval = retval; }
- }
-
-}
projects / org.ibex.core.git / blobdiff