**** BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
License Version 2.0 (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-v20.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) 2009-2010 Yoko Harada 
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 *****
/**
 * **** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (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-v20.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) 2009-2010 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.internal;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.net.URL;

import org.jruby.Ruby;
import org.jruby.RubyInstanceConfig.CompileMode;
import org.jruby.RubyRuntimeAdapter;
import org.jruby.RubyString;
import org.jruby.ast.Node;
import org.jruby.ast.executable.Script;
import org.jruby.embed.AttributeName;
import org.jruby.embed.EmbedEvalUnit;
import org.jruby.embed.EmbedRubyRuntimeAdapter;
import org.jruby.embed.ParseFailedException;
import org.jruby.embed.PathType;
import org.jruby.embed.ScriptingContainer;
import org.jruby.embed.io.ReaderInputStream;
import org.jruby.embed.util.SystemPropertyCatcher;
import org.jruby.exceptions.RaiseException;
import org.jruby.internal.runtime.GlobalVariable;
import org.jruby.internal.runtime.ValueAccessor;
import org.jruby.javasupport.JavaEmbedUtils;
import org.jruby.javasupport.JavaEmbedUtils.EvalUnit;
import org.jruby.parser.StaticScope;
import org.jruby.parser.StaticScopeFactory;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.IAccessor;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.load.LoadService;
import org.jruby.runtime.scope.ManyVarsDynamicScope;

Author:
Yoko Harada /**
 *
 * @author Yoko Harada <yokolet@gmail.com>
 */
public class EmbedRubyRuntimeAdapterImpl implements EmbedRubyRuntimeAdapter {

    private final RubyRuntimeAdapter adapter = JavaEmbedUtils.newRuntimeAdapter();
    private final ScriptingContainer container;

    public EmbedRubyRuntimeAdapterImpl(ScriptingContainer container) {
        this.container = container;
    }

    public EmbedEvalUnit parse(String script, int... lines) {
        if (script == null) {
            return null;
        }
        boolean unicode_escape = false;
        Object obj = container.getAttribute(AttributeName.UNICODE_ESCAPE);
        if (obj != null && obj instanceof Boolean) {
            unicode_escape = (Boolean)obj;
        }
        if (unicode_escape) {
            InputStream istream = new ReaderInputStream(new StringReader(script));
            return runParser(istream, null, lines);
        } else {
            return runParser(script, null, lines);
        }
    }

    public EmbedEvalUnit parse(Reader reader, String filename, int... lines) {
        if (reader != null) {
            InputStream istream = new ReaderInputStream(reader);
            return runParser(istream, filename, lines);
        } else {
            return null;
        }
    }

    public EmbedEvalUnit parse(PathType type, String filename, int... lines) {
        if (filename == null) {
            return null;
        }
        if (type == null) {
            type = PathType.ABSOLUTE;
        }
        InputStream istream = null;
        try {
            switch (type) {
                case ABSOLUTE:
                    istream = new FileInputStream(filename);
                    break;
                case RELATIVE:
                    String basedir = (String) container.getAttribute(AttributeName.BASE_DIR);
                    if (basedir == null) {
                        basedir = SystemPropertyCatcher.getBaseDir();
                    }
                    String absolutePath = basedir + File.separator + filename;
                    istream = new FileInputStream(absolutePath);
                    break;
                case CLASSPATH:
                    URL loc = container.getProvider().getRuntime().getJRubyClassLoader().getResource(filename);
                    if (loc == null) {
                        istream = null; // as in ClassLoader.getResourceAsStream
                    } else {
                        filename = LoadService.classpathFilenameFromURL(filename, loc, true);
                        try {
                            istream = loc.openStream();
                        } catch (IOException ioe) {
                            istream = null; // as in getClassLoader.getResourceAsStream
                        }
                    }
                    break;
            }
            return parse(istream, filename, lines);
        } catch (FileNotFoundException e) {
            throw new ParseFailedException(e);
        } finally {
            if (istream != null) {
                try {istream.close();} catch (IOException ioe) {}
            }
        }
    }

    public EmbedEvalUnit parse(InputStream istream, String filename, int... lines) {
        if (istream != null) {
            return runParser(istream, filename, lines);
        } else {
            return null;
        }
    }

    private EmbedEvalUnit runParser(Object input, String filename, int... lines) {
        if (input == null) {
            return null;
        }
        if (filename == null || filename.length() == 0) {
            filename = container.getScriptFilename();
        }
        final Ruby runtime = container.getProvider().getRuntime();
        IAccessor $0 = new ValueAccessor(RubyString.newString(runtime, filename));
        runtime.getGlobalVariables().define("$PROGRAM_NAME", $0, GlobalVariable.Scope.GLOBAL);
        runtime.getGlobalVariables().define("$0", $0, GlobalVariable.Scope.GLOBAL);

        int line = 0;
        if (lines != null && lines.length > 0) {
            line = lines[0];
        }
        try {
            ManyVarsDynamicScope scope  = null;
            boolean sharing_variables = true;
            Object obj = container.getAttribute(AttributeName.SHARING_VARIABLES);
            if (obj != null && obj instanceof Boolean && ((Boolean) obj) == false) {
                sharing_variables = false;
            }
            if (sharing_variables) {
                scope = getManyVarsDynamicScope(container, 0);
            }
            final Node node;
            if (input instanceof String) {
                node = runtime.parseEval((String)input, filename, scope, line);
            } else {
                node = runtime.parseFile((InputStream)input, filename, scope, line);
            }
            CompileMode compileMode = runtime.getInstanceConfig().getCompileMode();
            if (compileMode == CompileMode.FORCE) {
                // CON FIXME: We may need to force heap variables here so the compiled script uses our provided scope
                Script script = runtime.tryCompile(node);
                if (script != null) {
                    return new EmbedEvalUnitImpl(container, node, scope, script);
                } else {
                    return new EmbedEvalUnitImpl(container, node, scope);
                }
            }
            return new EmbedEvalUnitImpl(container, node, scope);
        } catch (RaiseException e) {
            runtime.printError(e.getException());
            throw new ParseFailedException(e.getMessage(), e);
        } catch (Throwable e) {
            throw new ParseFailedException(e);
        } finally {
            try {
                if (input instanceof FileInputStream) {
                    ((InputStream)input).close();
                }
            } catch (IOException ex) {
                throw new ParseFailedException(ex);
            }
        }
    }

    static ManyVarsDynamicScope getManyVarsDynamicScope(ScriptingContainer container, int depth) {
        ManyVarsDynamicScope scope;
        StaticScopeFactory scopeFactory = container.getProvider().getRuntime().getStaticScopeFactory();

        // root our parsing scope with a dummy scope
        StaticScope topStaticScope = scopeFactory.newLocalScope(null);
        topStaticScope.setModule(container.getProvider().getRuntime().getObject());

        DynamicScope currentScope = new ManyVarsDynamicScope(topStaticScope, null);
        String[] names4Injection = container.getVarMap().getLocalVarNames();
        StaticScope evalScope = names4Injection == null || names4Injection.length == 0 ?
                scopeFactory.newEvalScope(currentScope.getStaticScope()) :
                scopeFactory.newEvalScope(currentScope.getStaticScope(), names4Injection);
        scope = new ManyVarsDynamicScope(evalScope, currentScope);

        // JRUBY-5501: ensure we've set up a cref for the scope too
        scope.getStaticScope().determineModule();

        return scope;
    }

    public IRubyObject eval(Ruby runtime, String script) {
        return adapter.eval(runtime, script);
    }

    public EvalUnit parse(Ruby runtime, String script, String filename, int lineNumber) {
        return adapter.parse(runtime, script, filename, lineNumber);
    }

    public EvalUnit parse(Ruby runtime, InputStream istream, String filename, int lineNumber) {
        return adapter.parse(runtime, istream, filename, lineNumber);
    }
}