Source Code Cross Referenced for Token.java in  » Scripting » groovy-1.0 » org » codehaus » groovy » syntax » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » org.codehaus.groovy.syntax 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         $Id: Token.java 4032 2006-08-30 07:18:49Z mguillem $
003:
004:         Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:
006:         Redistribution and use of this software and associated documentation
007:         ("Software"), with or without modification, are permitted provided
008:         that the following conditions are met:
009:
010:         1. Redistributions of source code must retain copyright
011:            statements and notices.  Redistributions must also contain a
012:            copy of this document.
013:
014:         2. Redistributions in binary form must reproduce the
015:            above copyright notice, this list of conditions and the
016:            following disclaimer in the documentation and/or other
017:            materials provided with the distribution.
018:
019:         3. The name "groovy" must not be used to endorse or promote
020:            products derived from this Software without prior written
021:            permission of The Codehaus.  For written permission,
022:            please contact info@codehaus.org.
023:
024:         4. Products derived from this Software may not be called "groovy"
025:            nor may "groovy" appear in their names without prior written
026:            permission of The Codehaus. "groovy" is a registered
027:            trademark of The Codehaus.
028:
029:         5. Due credit should be given to The Codehaus -
030:            http://groovy.codehaus.org/
031:
032:         THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033:         ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034:         NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035:         FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036:         THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042:         ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043:         OF THE POSSIBILITY OF SUCH DAMAGE.
044:
045:         */
046:
047:        package org.codehaus.groovy.syntax;
048:
049:        import org.codehaus.groovy.GroovyBugError;
050:
051:        /**
052:         *  A <code>CSTNode</code> produced by the <code>Lexer</code>.
053:         *
054:         *  @see antlr.Parser
055:         *  @see antlr.Token
056:         *  @see Reduction
057:         *  @see Types
058:         *
059:         *  @author <a href="mailto:bob@werken.com">bob mcwhirter</a>
060:         *  @author <a href="mailto:cpoirier@dreaming.org">Chris Poirier</a>
061:         *
062:         *  @version $Id: Token.java 4032 2006-08-30 07:18:49Z mguillem $
063:         */
064:
065:        public class Token extends CSTNode {
066:            public static final Token NULL = new Token();
067:            public static final Token EOF = new Token(Types.EOF, "", -1, -1);
068:
069:            //---------------------------------------------------------------------------
070:            // TOKEN INITIALIZATION AND SUCH
071:
072:            private int type = Types.UNKNOWN; // the actual type identified by the lexer
073:            private int meaning = Types.UNKNOWN; // an interpretation applied to the token after the fact
074:
075:            private String text = ""; // the text of the token
076:            private int startLine = -1; // the source line on which the token begins
077:            private int startColumn = -1; // the source column on which the token begins
078:
079:            /**
080:             *  Initializes the Token with the specified information.
081:             */
082:
083:            public Token(int type, String text, int startLine, int startColumn) {
084:                this .type = type;
085:                this .meaning = type;
086:                this .text = text;
087:                this .startLine = startLine;
088:                this .startColumn = startColumn;
089:            }
090:
091:            /**
092:             *  Initializes the NULL Token.
093:             */
094:
095:            private Token() {
096:            }
097:
098:            /**
099:             *  Returns a copy of this Token.
100:             */
101:
102:            public Token dup() {
103:                Token token = new Token(this .type, this .text, this .startLine,
104:                        this .startColumn);
105:                token.setMeaning(this .meaning);
106:
107:                return token;
108:            }
109:
110:            //---------------------------------------------------------------------------
111:            // NODE IDENTIFICATION AND MEANING
112:
113:            /**
114:             *  Returns the meaning of this node.  If the node isEmpty(), returns
115:             *  the type of Token.NULL.
116:             */
117:
118:            public int getMeaning() {
119:                return meaning;
120:            }
121:
122:            /**
123:             *  Sets the meaning for this node (and it's root Token).  Not
124:             *  valid if the node isEmpty().  Returns this token, for
125:             *  convenience.
126:             */
127:
128:            public CSTNode setMeaning(int meaning) {
129:                this .meaning = meaning;
130:                return this ;
131:            }
132:
133:            /**
134:             *  Returns the actual type of the node.  If the node isEmpty(), returns
135:             *  the type of Token.NULL.
136:             */
137:
138:            public int getType() {
139:                return type;
140:            }
141:
142:            //---------------------------------------------------------------------------
143:            // MEMBER ACCESS
144:
145:            /**
146:             *  Returns the number of elements in the node (including root).
147:             */
148:
149:            public int size() {
150:                return 1;
151:            }
152:
153:            /**
154:             *  Returns the specified element, or null.
155:             */
156:
157:            public CSTNode get(int index) {
158:                if (index > 0) {
159:                    throw new GroovyBugError(
160:                            "attempt to access Token element other than root");
161:                }
162:
163:                return this ;
164:            }
165:
166:            /**
167:             *  Returns the root of the node.  By convention, all nodes have
168:             *  a Token as the first element (or root), which indicates the type
169:             *  of the node.  May return null if the node <code>isEmpty()</code>.
170:             */
171:
172:            public Token getRoot() {
173:                return this ;
174:            }
175:
176:            /**
177:             *  Returns the text of the root node.  Uses <code>getRoot(true)</code>
178:             *  to get the root, so you will only receive null in return if the
179:             *  root token returns it.
180:             */
181:
182:            public String getRootText() {
183:                return text;
184:            }
185:
186:            /**
187:             *  Returns the text of the token.  Equivalent to
188:             *  <code>getRootText()</code> when called directly.
189:             */
190:
191:            public String getText() {
192:                return text;
193:            }
194:
195:            /**
196:             *  Not advisable, but if you need to adjust the token's text, this
197:             *  will do it.
198:             */
199:
200:            public void setText(String text) {
201:                this .text = text;
202:            }
203:
204:            /**
205:             *  Returns the starting line of the node.  Returns -1
206:             *  if not known.
207:             */
208:
209:            public int getStartLine() {
210:                return startLine;
211:            }
212:
213:            /**
214:             *  Returns the starting column of the node.  Returns -1
215:             *  if not known.
216:             */
217:
218:            public int getStartColumn() {
219:                return startColumn;
220:            }
221:
222:            //---------------------------------------------------------------------------
223:            // OPERATIONS
224:
225:            /**
226:             *  Creates a <code>Reduction</code> from this token.  Returns self if the
227:             *  node is already a <code>Reduction</code>.
228:             */
229:
230:            public Reduction asReduction() {
231:                return new Reduction(this );
232:            }
233:
234:            /**
235:             *  Creates a <code>Reduction</code> from this token, adding the supplied
236:             *  node as the second element.
237:             */
238:
239:            public Reduction asReduction(CSTNode second) {
240:                Reduction created = asReduction();
241:                created.add(second);
242:                return created;
243:            }
244:
245:            /**
246:             *  Creates a <code>Reduction</code> from this token, adding the supplied
247:             *  nodes as the second and third element, respectively.
248:             */
249:
250:            public Reduction asReduction(CSTNode second, CSTNode third) {
251:                Reduction created = asReduction(second);
252:                created.add(third);
253:                return created;
254:            }
255:
256:            /**
257:             *  Creates a <code>Reduction</code> from this token, adding the supplied
258:             *  nodes as the second, third, and fourth element, respectively.
259:             */
260:
261:            public Reduction asReduction(CSTNode second, CSTNode third,
262:                    CSTNode fourth) {
263:                Reduction created = asReduction(second, third);
264:                created.add(fourth);
265:                return created;
266:            }
267:
268:            //---------------------------------------------------------------------------
269:            // TOKEN FACTORIES
270:
271:            /**
272:             *  Creates a token that represents a keyword.  Returns null if the
273:             *  specified text isn't a keyword.
274:             */
275:
276:            public static Token newKeyword(String text, int startLine,
277:                    int startColumn) {
278:
279:                int type = Types.lookupKeyword(text);
280:                if (type != Types.UNKNOWN) {
281:                    return new Token(type, text, startLine, startColumn);
282:                }
283:
284:                return null;
285:
286:            }
287:
288:            /**
289:             *  Creates a token that represents a double-quoted string.
290:             */
291:
292:            public static Token newString(String text, int startLine,
293:                    int startColumn) {
294:                return new Token(Types.STRING, text, startLine, startColumn);
295:            }
296:
297:            /**
298:             *  Creates a token that represents an identifier.
299:             */
300:
301:            public static Token newIdentifier(String text, int startLine,
302:                    int startColumn) {
303:                return new Token(Types.IDENTIFIER, text, startLine, startColumn);
304:            }
305:
306:            /**
307:             *  Creates a token that represents an integer.
308:             */
309:
310:            public static Token newInteger(String text, int startLine,
311:                    int startColumn) {
312:                return new Token(Types.INTEGER_NUMBER, text, startLine,
313:                        startColumn);
314:            }
315:
316:            /**
317:             *  Creates a token that represents a decimal number.
318:             */
319:
320:            public static Token newDecimal(String text, int startLine,
321:                    int startColumn) {
322:                return new Token(Types.DECIMAL_NUMBER, text, startLine,
323:                        startColumn);
324:            }
325:
326:            /**
327:             *  Creates a token that represents a symbol, using a library for the text.
328:             */
329:
330:            public static Token newSymbol(int type, int startLine,
331:                    int startColumn) {
332:                return new Token(type, Types.getText(type), startLine,
333:                        startColumn);
334:            }
335:
336:            /**
337:             *  Creates a token that represents a symbol, using a library for the type.
338:             */
339:
340:            public static Token newSymbol(String type, int startLine,
341:                    int startColumn) {
342:                return new Token(Types.lookupSymbol(type), type, startLine,
343:                        startColumn);
344:            }
345:
346:            /**
347:             *  Creates a token with the specified meaning.
348:             */
349:
350:            public static Token newPlaceholder(int type) {
351:                Token token = new Token(Types.UNKNOWN, "", -1, -1);
352:                token.setMeaning(type);
353:
354:                return token;
355:            }
356:
357:        }
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