001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.text.ui;
021
022 import groovy.lang.Closure;
023 import org.crsh.command.CRaSHCommand;
024 import org.crsh.command.CommandInvoker;
025 import org.crsh.command.GroovyScriptCommand;
026 import org.crsh.command.InvocationContext;
027 import org.crsh.command.ScriptException;
028 import org.crsh.text.RenderPrintWriter;
029 import org.crsh.text.Renderable;
030 import org.crsh.text.Renderer;
031
032 import java.io.IOException;
033 import java.util.LinkedList;
034 import java.util.Map;
035
036 public class EvalElement extends Element {
037
038 /** The closure to evaluate. */
039 Closure closure;
040
041 public Renderer renderer() {
042
043 Object owner = closure.getOwner();
044
045 //
046 final InvocationContext ctx;
047 Object cmd;
048 while (true) {
049 if (owner instanceof CRaSHCommand) {
050 cmd = owner;
051 ctx = ((CRaSHCommand)cmd).peekContext();
052 break;
053 } else if (owner instanceof GroovyScriptCommand) {
054 cmd = owner;
055 ctx = ((GroovyScriptCommand)cmd).peekContext();
056 break;
057 } else if (owner instanceof Closure) {
058 owner = ((Closure)owner).getOwner();
059 } else {
060 throw new UnsupportedOperationException("Cannot resolver owner " + owner + " to command");
061 }
062 }
063
064 //
065 final LinkedList<Renderer> renderers = new LinkedList<Renderer>();
066
067 //
068 final InvocationContext nested = new InvocationContext() {
069
070 /** . */
071 private LinkedList<Object> buffer = new LinkedList<Object>();
072
073 /** . */
074 private Renderable renderable;
075
076 public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
077 return ctx.resolve(s);
078 }
079
080 public boolean isPiped() {
081 throw new UnsupportedOperationException();
082 }
083
084 public boolean takeAlternateBuffer() {
085 return false;
086 }
087
088 public boolean releaseAlternateBuffer() {
089 return false;
090 }
091
092 public RenderPrintWriter getWriter() {
093 return ctx.getWriter();
094 }
095
096 public Map<String, Object> getSession() {
097 return ctx.getSession();
098 }
099
100 public Map<String, Object> getAttributes() {
101 return ctx.getAttributes();
102 }
103
104 public int getWidth() {
105 return ctx.getWidth();
106 }
107
108 public int getHeight() {
109 return ctx.getHeight();
110 }
111
112 public String getProperty(String propertyName) {
113 return ctx.getProperty(propertyName);
114 }
115
116 public String readLine(String msg, boolean echo) {
117 return null;
118 }
119
120 public Class getConsumedType() {
121 return Object.class;
122 }
123
124 public void provide(Object element) throws IOException {
125 Renderable current = Renderable.getRenderable(element.getClass());
126 if (current == null) {
127 current = Renderable.ANY;
128 }
129 if (current != null) {
130 if (renderable != null && !current.equals(renderable)) {
131 flush();
132 }
133 buffer.addLast(element);
134 renderable = current;
135 }
136 }
137
138 public void flush() throws IOException {
139 // We don't really flush, we just compute renderables from the buffer
140 if (buffer.size() > 0) {
141 Renderer i = renderable.renderer(buffer.iterator());
142 buffer.clear();
143 renderers.add(i);
144 }
145 }
146
147 public void close() throws IOException {
148 // Nothing to do, except maybe release resources (and also prevent to do any other operation)
149 }
150 };
151
152 if (cmd instanceof CRaSHCommand) {
153 ((CRaSHCommand)cmd).pushContext(nested);
154 } else {
155 ((GroovyScriptCommand)cmd).pushContext(nested);
156 }
157 try {
158 closure.call();
159 }
160 finally {
161 if (cmd instanceof CRaSHCommand) {
162 ((CRaSHCommand)cmd).popContext();
163 } else {
164 ((GroovyScriptCommand)cmd).popContext();
165 }
166 }
167
168 // Be sure to flush
169 try {
170 nested.flush();
171 }
172 catch (IOException e) {
173 e.printStackTrace();
174 }
175
176 //
177 return Renderer.vertical(renderers);
178 }
179 }