Source Code Cross Referenced for CloneExpressionVisitor.java in  » Ajax » GWT » com » google » gwt » dev » jjs » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » GWT » com.google.gwt.dev.jjs.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2007 Google Inc.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005:         * use this file except in compliance with the License. You may obtain a copy of
006:         * the License at
007:         * 
008:         * http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012:         * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013:         * License for the specific language governing permissions and limitations under
014:         * the License.
015:         */
016:        package com.google.gwt.dev.jjs.impl;
017:
018:        import com.google.gwt.dev.jjs.InternalCompilerException;
019:        import com.google.gwt.dev.jjs.ast.Context;
020:        import com.google.gwt.dev.jjs.ast.JAbsentArrayDimension;
021:        import com.google.gwt.dev.jjs.ast.JArrayRef;
022:        import com.google.gwt.dev.jjs.ast.JBinaryOperation;
023:        import com.google.gwt.dev.jjs.ast.JBooleanLiteral;
024:        import com.google.gwt.dev.jjs.ast.JCastOperation;
025:        import com.google.gwt.dev.jjs.ast.JCharLiteral;
026:        import com.google.gwt.dev.jjs.ast.JClassLiteral;
027:        import com.google.gwt.dev.jjs.ast.JConditional;
028:        import com.google.gwt.dev.jjs.ast.JDoubleLiteral;
029:        import com.google.gwt.dev.jjs.ast.JExpression;
030:        import com.google.gwt.dev.jjs.ast.JFieldRef;
031:        import com.google.gwt.dev.jjs.ast.JFloatLiteral;
032:        import com.google.gwt.dev.jjs.ast.JInstanceOf;
033:        import com.google.gwt.dev.jjs.ast.JIntLiteral;
034:        import com.google.gwt.dev.jjs.ast.JLocalRef;
035:        import com.google.gwt.dev.jjs.ast.JLongLiteral;
036:        import com.google.gwt.dev.jjs.ast.JMethodCall;
037:        import com.google.gwt.dev.jjs.ast.JNewArray;
038:        import com.google.gwt.dev.jjs.ast.JNewInstance;
039:        import com.google.gwt.dev.jjs.ast.JNullLiteral;
040:        import com.google.gwt.dev.jjs.ast.JParameterRef;
041:        import com.google.gwt.dev.jjs.ast.JPostfixOperation;
042:        import com.google.gwt.dev.jjs.ast.JPrefixOperation;
043:        import com.google.gwt.dev.jjs.ast.JProgram;
044:        import com.google.gwt.dev.jjs.ast.JStringLiteral;
045:        import com.google.gwt.dev.jjs.ast.JThisRef;
046:        import com.google.gwt.dev.jjs.ast.JVisitor;
047:        import com.google.gwt.dev.jjs.ast.js.JClassSeed;
048:        import com.google.gwt.dev.jjs.ast.js.JMultiExpression;
049:
050:        import java.util.ArrayList;
051:
052:        /**
053:         * A general purpose expression cloner.
054:         */
055:        public class CloneExpressionVisitor extends JVisitor {
056:            private JExpression expression;
057:            private JProgram program;
058:
059:            public CloneExpressionVisitor(JProgram program) {
060:                this .program = program;
061:            }
062:
063:            public JExpression cloneExpression(JExpression expr) {
064:                if (expr == null) {
065:                    return null;
066:                }
067:
068:                this .accept(expr);
069:
070:                if (expression == null) {
071:                    throw new InternalCompilerException(expr,
072:                            "Unable to clone expression", null);
073:                }
074:
075:                return expression;
076:            }
077:
078:            @Override
079:            public boolean visit(JAbsentArrayDimension x, Context ctx) {
080:                expression = x;
081:                return false;
082:            }
083:
084:            @Override
085:            public boolean visit(JArrayRef x, Context ctx) {
086:                expression = new JArrayRef(program, x.getSourceInfo(),
087:                        cloneExpression(x.getInstance()), cloneExpression(x
088:                                .getIndexExpr()));
089:                return false;
090:            }
091:
092:            @Override
093:            public boolean visit(JBinaryOperation x, Context ctx) {
094:                expression = new JBinaryOperation(program, x.getSourceInfo(), x
095:                        .getType(), x.getOp(), cloneExpression(x.getLhs()),
096:                        cloneExpression(x.getRhs()));
097:                return false;
098:            }
099:
100:            @Override
101:            public boolean visit(JBooleanLiteral x, Context ctx) {
102:                expression = x;
103:                return false;
104:            }
105:
106:            @Override
107:            public boolean visit(JCastOperation x, Context ctx) {
108:                expression = new JCastOperation(program, x.getSourceInfo(), x
109:                        .getCastType(), cloneExpression(x.getExpr()));
110:                return false;
111:            }
112:
113:            @Override
114:            public boolean visit(JCharLiteral x, Context ctx) {
115:                expression = x;
116:                return false;
117:            }
118:
119:            @Override
120:            public boolean visit(JClassLiteral x, Context ctx) {
121:                expression = x;
122:                return false;
123:            }
124:
125:            @Override
126:            public boolean visit(JClassSeed x, Context ctx) {
127:                expression = new JClassSeed(program, x.getRefType());
128:                return false;
129:            }
130:
131:            @Override
132:            public boolean visit(JConditional x, Context ctx) {
133:                expression = new JConditional(program, x.getSourceInfo(), x
134:                        .getType(), cloneExpression(x.getIfTest()),
135:                        cloneExpression(x.getThenExpr()), cloneExpression(x
136:                                .getElseExpr()));
137:                return false;
138:            }
139:
140:            @Override
141:            public boolean visit(JDoubleLiteral x, Context ctx) {
142:                expression = x;
143:                return false;
144:            }
145:
146:            @Override
147:            public boolean visit(JFieldRef x, Context ctx) {
148:                expression = new JFieldRef(program, x.getSourceInfo(),
149:                        cloneExpression(x.getInstance()), x.getField(), x
150:                                .getEnclosingType());
151:                return false;
152:            }
153:
154:            @Override
155:            public boolean visit(JFloatLiteral x, Context ctx) {
156:                expression = x;
157:                return false;
158:            }
159:
160:            @Override
161:            public boolean visit(JInstanceOf x, Context ctx) {
162:                expression = new JInstanceOf(program, x.getSourceInfo(), x
163:                        .getTestType(), cloneExpression(x.getExpr()));
164:                return false;
165:            }
166:
167:            @Override
168:            public boolean visit(JIntLiteral x, Context ctx) {
169:                expression = x;
170:                return false;
171:            }
172:
173:            @Override
174:            public boolean visit(JLocalRef x, Context ctx) {
175:                expression = new JLocalRef(program, x.getSourceInfo(), x
176:                        .getLocal());
177:                return false;
178:            }
179:
180:            @Override
181:            public boolean visit(JLongLiteral x, Context ctx) {
182:                expression = x;
183:                return false;
184:            }
185:
186:            @Override
187:            public boolean visit(JMethodCall x, Context ctx) {
188:                JMethodCall newMethodCall = new JMethodCall(program, x
189:                        .getSourceInfo(), cloneExpression(x.getInstance()), x
190:                        .getTarget());
191:
192:                for (JExpression arg : x.getArgs()) {
193:                    newMethodCall.getArgs().add(cloneExpression(arg));
194:                }
195:
196:                expression = newMethodCall;
197:                return false;
198:            }
199:
200:            @Override
201:            public boolean visit(JMultiExpression x, Context ctx) {
202:                JMultiExpression multi = new JMultiExpression(program, x
203:                        .getSourceInfo());
204:                for (JExpression expr : x.exprs) {
205:                    multi.exprs.add(cloneExpression(expr));
206:                }
207:
208:                expression = multi;
209:                return false;
210:            }
211:
212:            @Override
213:            public boolean visit(JNewArray x, Context ctx) {
214:                JNewArray newArray = new JNewArray(program, x.getSourceInfo(),
215:                        x.getArrayType());
216:
217:                if (x.dims != null) {
218:                    newArray.dims = new ArrayList<JExpression>();
219:                    for (JExpression dim : x.dims) {
220:                        newArray.dims.add(cloneExpression(dim));
221:                    }
222:                }
223:                if (x.initializers != null) {
224:                    newArray.initializers = new ArrayList<JExpression>();
225:                    for (JExpression initializer : x.initializers) {
226:                        newArray.initializers.add(cloneExpression(initializer));
227:                    }
228:                }
229:
230:                expression = newArray;
231:                return false;
232:            }
233:
234:            @Override
235:            public boolean visit(JNewInstance x, Context ctx) {
236:                expression = new JNewInstance(program, x.getSourceInfo(), x
237:                        .getClassType());
238:                return false;
239:            }
240:
241:            @Override
242:            public boolean visit(JNullLiteral x, Context ctx) {
243:                expression = x;
244:                return false;
245:            }
246:
247:            @Override
248:            public boolean visit(JParameterRef x, Context ctx) {
249:                expression = new JParameterRef(program, x.getSourceInfo(), x
250:                        .getParameter());
251:                return false;
252:            }
253:
254:            @Override
255:            public boolean visit(JPostfixOperation x, Context ctx) {
256:                expression = new JPostfixOperation(program, x.getSourceInfo(),
257:                        x.getOp(), cloneExpression(x.getArg()));
258:                return false;
259:            }
260:
261:            @Override
262:            public boolean visit(JPrefixOperation x, Context ctx) {
263:                expression = new JPrefixOperation(program, x.getSourceInfo(), x
264:                        .getOp(), cloneExpression(x.getArg()));
265:                return false;
266:            }
267:
268:            @Override
269:            public boolean visit(JStringLiteral x, Context ctx) {
270:                expression = x;
271:                return false;
272:            }
273:
274:            @Override
275:            public boolean visit(JThisRef x, Context ctx) {
276:                expression = program.getExprThisRef(x.getSourceInfo(), x
277:                        .getClassType());
278:                return false;
279:            }
280:        }
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