block.java

RESIN 3.2 最新源码

    function.cl.popDepth();
    function.println("}");

    Block old = pop();
    if (! old.canExit)
      old.isDead = true;

    return old;
  }

  Block startSwitch(Expr test)
    throws ESException
  {
    ESId id = ESId.intern("_switchtemp");
    
    function.print("_switchtemp = ");
    function.addExpr(test);
    function.println(";");
    
    Block block = create();
    block.switchTop = function.getSwitch();
    block.isLoop = true;
    block.hasDefault = false;
    
    function.println("switch (_switchcode) {");
    return block;
  }

  void doCase(int i)
    throws ESException
  {
    isDead = false;
    evalExpr();
    function.println("case " + i + ":");
  }

  void doDefault()
    throws ESException
  {
    isDead = false;
    hasDefault = true;
    evalExpr();
    function.println("default:");
  }

  Block fillSwitch(ArrayList exprs)
    throws ESException
  {
    evalExpr();
    if (! hasDefault && ! isDead) {
      function.println("default:");
      function.println("  break;");
    }
    else if (! isDead)
      function.println("break;");
    function.println("}");

    int mark = function.mark();
    
    for (int i = 0; i < exprs.size(); i++) {
      if (i != 0)
        function.print("else ");

      Expr test = (Expr) exprs.get(i);

      function.print("if (_switchtemp.equals(");
      function.addExpr(test);
      function.println(")) _switchcode = " + i + ";");
    }
    if (exprs.size() > 0)
      function.print("else ");
    function.println("_switchcode = -1;");

    function.moveChunk(switchTop, mark);

    Block old = pop();
    if (isDead && ! canExit && hasDefault)
      old.isDead = true;

    return old;
  }
  
  void doBreak(ESId id)
    throws ESException
  {
    Block block = this;
    for (; block != null; block = block.parent) {
      if (block.id == id) {
        block.canExit = true;
        break;
      }
    }
    
    if (block == null)
      throw error("break needs enclosing loop");
    
    function.setVars();
    evalExpr();
    function.println("break " + id + ";");
    isDead = true;
  }
  
  void doBreak()
    throws ESException
  {
    Block block = this;
    for (; block != null; block = block.parent) {
      if (block.isLoop) {
        block.canExit = true;
        break;
      }
    }
    
    if (block == null)
      throw error("break needs enclosing loop");
    
    function.setVars();
    evalExpr();
    function.println("break;");
    isDead = true;
  }
  
  void doContinue(ESId id)
    throws ESException
  {
    Block block = this;
    for (; block != null; block = block.parent) {
      if (block.id == id && block.isLoop)
        break;
      /*
      else
        block.canExit = true;
      */
    }
    if (block == null)
      throw error("continue needs enclosing loop");
    
    function.setVars();
    evalExpr();
    function.println("continue " + id + ";");
    isDead = true;
  }
  
  void doContinue()
    throws ESException
  {
    if (findBlock(null) == null)
      throw error("continue needs enclosing loop");
    
    function.setVars();
    evalExpr();
    function.println("continue;");
    isDead = true;
  }

  private Block findBlock(ESId id)
  {
    for (Block block = this; block != null; block = block.parent) {
      if (id != null && block.id == id)
        return block;
      else if (id == null && block.isLoop)
        return block;
    }
    
    return null;
  }
  
  Block startWith(Expr expr)
    throws ESException
  {
    function.setArguments();
    function.setUseAllVariables();
    evalExpr();
    withDepth++;
    function.println("try {");
    function.print("_env.pushScope(");
    function.addExpr(expr);
    function.println(");");
    setTop();
    
    return this;
  }
  
  Block endWith()
    throws ESException
  {
    evalExpr();
    withDepth--;
    function.println("} finally {");
    function.println("_env.popScope();");
    function.println("}");
    
    return this;
  }

  int getWithDepth()
  {
    return withDepth;
  }
  
  Block startTry()
    throws ESException
  {
    function.setVars();
    evalExpr();
    function.println("try {");
    return this;
  }
  
  Block endTry()
    throws ESException
  {
    function.setVars();
    evalExpr();
    function.println("}");
    
    return this;
  }
  
  void doTry()
    throws ESException
  {
    evalExpr();

    int i = 0;
    for (; i < function.data.size(); i++) {
      Object o = function.data.get(i);
      if (o != top) {
      }
      else if (o instanceof CharBuffer) {
        CharBuffer cb = (CharBuffer) o;
        cb.insert(topMark, " try {\n");
        break;
      }
      else {
        function.data.add(i + 1, new CharBuffer(" try {\n"));
        break;
      }
    }
    if (i < function.data.size()) {
    }
    else if (function.tail != null && top == function.tail)
      function.tail.insert(topMark, " try {\n");
    else
      function.data.add(0, new CharBuffer(" try {\n"));

    function.println("}");
  }
  
  Block startCatch(String exn, Expr var)
    throws ESException
  {
    evalExpr();
    String temp = "_e" + function.getTemp();
    function.println("catch (" + exn + " " + temp + ") {");
    if (var != null) {
      Expr expr = new SpecialExpr(this, SpecialExpr.EXCEPTION, temp);
      var.assign(expr).exprStatement(function);
    }
      
    isDead = false;
    setTop();
    
    return this;
  }
  
  Block endCatch()
    throws ESException
  {
    evalExpr();
    function.println("}");
    return this;
  }
  
  Block startFinally()
    throws ESException
  {
    evalExpr();
    Block block = create();
    function.println("finally {");
    function.pushStatementLoop();
    block.setTop();

    return block;
  }
  
  Block endFinally()
    throws ESException
  {
    evalExpr();
    function.println("}");
    function.popStatementLoop();
    return pop();
  }
  
  Block startSynchronized(Expr expr)
    throws ESException
  {
    evalExpr();
    function.print("synchronized (");
    function.addExpr(expr);
    function.println(".toJavaObject()) {");

    return create();
  }
  
  Block endSynchronized()
    throws ESException
  {
    evalExpr();

    function.println("}");
    
    Block old = pop();
    old.isDead = isDead;
    
    return old;
  }
  
  void doThrow(Expr expr)
    throws ESException
  {
    function.print("throw (Exception)");
    function.addExpr(expr);
    function.println(".toJavaObject();");
    isDead = true;
  }
  
  void doReturn(Expr value)
    throws ESException
  {
    evalExpr();
    function.print("return ");

    value.setUsed();
    if (function.getReturnType() != null)
      function.addExpr(new TopExpr(this, value,
                                   function.getReturnType()));
    else
      function.addExpr(value);
    
    function.println(";");
    isDead = true;
    /* can't break
    for (Block block = this; block != null; block = block.parent)
      block.canExit = true;
    */
  }
  
  void doReturn()
    throws ESException
  {
    evalExpr();
    
    if (function.getReturnType() != null)
      function.print("return 0;");
    else
      function.print("return ESBase.esUndefined;");
    isDead = true;
    /*
    for (Block block = this; block != null; block = block.parent)
      block.canExit = true;
    */
  }

  void finish()
    throws ESException
  {
    if (isDead)
      return;

    if (lastExpr != null) {
      function.print("return ");
      function.addExpr(lastExpr);
      function.println(";");
      lastExpr = null;
    }
    else if (hasStatementValue)
      function.println("return _val0;");
    else
      function.println("return ESBase.esUndefined;");
  }

  String newIterator(ESId id, Expr expr)
    throws ESException
  {
    evalExpr();
    
    String iter = "iter" + function.getIter();
    function.print(iter + " = ");
    function.addExpr(expr);
    function.println(".keys();");
    
    return iter;
  }

  void evalExpr() throws ESException
  {
    if (lastExpr == null)
      return;

    function.print(function.getStatementVar() + " = ");
    function.addExpr(lastExpr);
    function.println(";");
    
    lastExpr = null;
  }

  private static Block allocate()
  {
    Block block = new Block();

    return block;
  }

  ESException error(String message)
  {
    return parser.lexer.error(message);
  }
  
  void free()
  {
  }

  static {
    specialNames = new HashMap();
    specialNames.put(ESId.intern("Object"), "Object");
    specialNames.put(ESId.intern("Date"), "Date");
    specialNames.put(ESId.intern("String"), "String");
    specialNames.put(ESId.intern("Number"), "Number");
    specialNames.put(ESId.intern("Array"), "Array");
    specialNames.put(ESId.intern("Boolean"), "Boolean");
    specialNames.put(ESId.intern("Math"), "Math");
  };
}