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**** BEGIN LICENSE BLOCK ***** Version: EPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Eclipse Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.eclipse.org/legal/epl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2009-2012 Yoko Harada <yokolet@gmail.com> Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the EPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the EPL, the GPL or the LGPL. **** END LICENSE BLOCK *****
 
 package org.jruby.embed.jsr223;
 
 import java.io.Writer;
 import java.util.Map;
 import java.util.Set;
 import org.jruby.Ruby;
A collection of JSR223 specific utility methods.

Author(s):
Yoko Harada <yokolet@gmail.com>
 
 public class Utils {
    
Gets line number value from engine's attribute map.

Parameters:
context ScriptContext to be used to the evaluation
Returns:
line number
 
     static int getLineNumber(ScriptContext context) {
         if (obj instanceof Integer) {
             return (Integer)obj;
         }
         return 0;
     }

    
Gets a receiver object from engine's attribute map.

Parameters:
context ScriptContext to be used to the evaluation
Returns:
receiver object or null if the attribute doesn't exist
 
     static Object getReceiver(ScriptContext context) {
     }
 
     static String getFilename(ScriptContext context) {
         Object filename = context.getAttribute(.);
         return filename != null ? (String)filename : "<script>";
     }
 
     static boolean isTerminationOn(ScriptContext context) {
         Object obj = context.getAttribute(..toString());
         if (obj != null && obj instanceof Boolean && ((Booleanobj) == true) {
             return true;
         }
         return false;
     }
     
     static boolean isClearVariablesOn(ScriptContext context) {
         Object obj = context.getAttribute(..toString());
         if (obj != null && obj instanceof Boolean && ((Booleanobj) == true) {
             return true;
        }
        return false;
    }
    static void preEval(ScriptingContainer containerScriptContext context) {
        Object receiver = Utils.getReceiverObject(context);
        Bindings bindings = context.getBindings(.);
        for (Map.Entry<StringObjectentry : bindings.entrySet()) {
            Utils.put(containerreceiverentry.getKey(), entry.getValue(), context);
        }
        try {
            //container.setReader(context.getReader());
            Utils.setWriter(containercontext.getWriter());
            Utils.setErrorWriter(containercontext.getErrorWriter());
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        } catch (BadDescriptorException ex) {
            throw new RuntimeException(ex);
        }
        
        // if key of globalMap exists in engineMap, this key-value pair should be skipped.
        bindings = context.getBindings(.);
        if (bindings == nullreturn;
        for (Map.Entry<StringObjectentry : bindings.entrySet()) {
            if (container.getVarMap().containsKey(entry.getKey())) continue;
            Utils.put(containerreceiverentry.getKey(), entry.getValue(), context);
        }
    }
    private static Object getReceiverObject(ScriptContext context) {
        if (context == nullreturn null;
    }
    
    private static void setWriter(ScriptingContainer containerWriter writerthrows IOExceptionBadDescriptorException {
        if (writer == null) {
            return;
        }
        Map map = container.getAttributeMap();
        if (map.containsKey(.)) {
            Writer old = (Writermap.get(.);
            if (old == writer) {
                return;
            }
        }
        map.put(.writer);
        
        Ruby runtime = container.getProvider().getRuntime();
        RubyIO io = getRubyIO(runtimewriter);
        runtime.defineVariable(new OutputGlobalVariable(runtime"$stdout"io), ..);
        runtime.getObject().storeConstant("STDOUT"io);
        runtime.getGlobalVariables().alias("$>""$stdout");
        runtime.getGlobalVariables().alias("$defout""$stdout");
    }
    
    private static void setErrorWriter(ScriptingContainer containerWriter writerthrows IOExceptionBadDescriptorException {
        if (writer == null) {
            return;
        }
        Map map = container.getAttributeMap();
        if (map.containsKey(.)) {
            Writer old = (Writermap.get(.);
            if (old == writer) {
                return;
            }
        }
        map.put(.writer);
        
        Ruby runtime = container.getProvider().getRuntime();
        RubyIO io = getRubyIO(runtimewriter);
        runtime.defineVariable(new OutputGlobalVariable(runtime"$stderr"io), .);
        runtime.getObject().storeConstant("STDERR"io);
        runtime.getGlobalVariables().alias("$deferr""$stderr");
    }
    
    private static RubyIO getRubyIO(Ruby runtimeWriter writerthrows IOExceptionBadDescriptorException {
        PrintStream pstream = new PrintStream(new WriterOutputStream(writer), true);
        RubyIO io = new RubyIO(runtimepstreamfalse);
        io.getOpenFile().getMainStreamSafe().setSync(true);
        io.getOpenFile().getMainStreamSafe().fflush();
        return io;
    }
    static void postEval(ScriptingContainer containerScriptContext context) {
        if (context == nullreturn;
        Object receiver = Utils.getReceiverObject(context);
        Bindings engineMap = context.getBindings(.);
        int size = engineMap.keySet().size();
        String[] names = engineMap.keySet().toArray(new String[size]);
        Iterator<Map.Entry<StringObject>> iter = engineMap.entrySet().iterator();
        for (;iter.hasNext();) {
            Map.Entry<StringObjectentry = iter.next();
            if (Utils.shouldLVarBeDeleted(containerentry.getKey())) {
                iter.remove();
            }
        }
        Set<Stringkeys = container.getVarMap().keySet();
        if (keys != null && keys.size() > 0) {
            for (String key : keys) {
                Object value = container.getVarMap().get(key);
                engineMap.put(Utils.adjustKey(key), value);
            }
        }
        Bindings globalMap = context.getBindings(.);
        if (globalMap == nullreturn;
        keys = globalMap.keySet();
        if (keys != null && keys.size() > 0) {
            for (String key : keys) {
                if (engineMap.containsKey(key)) continue;
                Object value = container.getVarMap().get(receiverkey);
                globalMap.put(keyvalue);
            }
        }
    }
    private static Object put(ScriptingContainer containerObject receiverString keyObject valueScriptContext context) {
        Object oldValue = null;
        String adjustedKey = Utils.adjustKey(key);
        if (Utils.isRubyVariable(containeradjustedKey)) {
            boolean sharing_variables = true;
            if (obj != null && obj instanceof Boolean && ((Booleanobj) == false) {
                sharing_variables = false;
            }
            if (sharing_variables || "ARGV".equals(adjustedKey)) {
                oldValue = container.put(receiveradjustedKeyvalue);
            }
        } else {
            if (adjustedKey.equals(..toString())) {
                oldValue = container.setAttribute(.value);
            } else {
                oldValue = container.setAttribute(adjustedKeyvalue);
            }
            /* Maybe no need anymore?
            if (container.getAttributeMap().containsKey(BACKED_BINDING)) {
                Bindings b = (Bindings) container.getAttribute(BACKED_BINDING);
                b.put(key, value);
            }
             *
             */
        }
        return oldValue;
    }
    static boolean isRubyVariable(ScriptingContainer containerString name) {
        return VariableInterceptor.isKindOfRubyVariable(container.getProvider().getLocalVariableBehavior(), name);
    }
    private static String adjustKey(String key) {
        if (key.equals(.)) {
            return "ARGV";
        } if ("ARGV".equals(key)) {
            return .;
        } else {
            return key;
        }
    }
    
    private static boolean shouldLVarBeDeleted(ScriptingContainer containerString key) {
        LocalVariableBehavior behavior = container.getProvider().getLocalVariableBehavior();
        if (behavior != .return false;
        return TransientLocalVariable.isValidName(key);
    }
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