Mercurial > hg > blitz_condensed
comparison src/com/go/trove/io/SourceReader.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.io; | |
54 | |
55 import java.io.*; | |
56 | |
57 /****************************************************************************** | |
58 * The SourceReader provides several services for reading source input. | |
59 * It calculates line numbers, position in the source file, supports two | |
60 * character pushback, extracts code from text that allows mixed code and | |
61 * plain text, and it processes unicode escape sequences that appear in | |
62 * source code. | |
63 * | |
64 * <p>Readers return -1 when the end of the stream, has been reached, and so | |
65 * does SourceReader. SourceReader will also return other special negative | |
66 * values to indicate a tag substitution. ENTER_CODE is returned to indicate | |
67 * that characters read are in source code, and ENTER_TEXT is returned to | |
68 * indicate that characters read are in plain text. The first character read | |
69 * from a SourceReader is either ENTER_CODE or ENTER_TEXT; | |
70 * | |
71 * @author Brian S O'Neill | |
72 * @version | |
73 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 4/26/01 <!-- $--> | |
74 */ | |
75 public class SourceReader extends PushbackPositionReader { | |
76 public static final int ENTER_CODE = -2; | |
77 public static final int ENTER_TEXT = -3; | |
78 | |
79 private static Reader createReader(Reader source, | |
80 String beginTag, String endTag) { | |
81 String[] tags = new String[4]; | |
82 int[] codes = new int[4]; | |
83 | |
84 int i = 0; | |
85 // Convert different kinds of line breaks into the newline character. | |
86 tags[i] = "\r\n"; codes[i++] = '\n'; | |
87 tags[i] = "\r"; codes[i++] = '\n'; | |
88 | |
89 if (beginTag != null && beginTag.length() > 0) { | |
90 tags[i] = beginTag; codes[i++] = ENTER_CODE; | |
91 } | |
92 | |
93 if (endTag != null && endTag.length() > 0) { | |
94 tags[i] = endTag; codes[i++] = ENTER_TEXT; | |
95 } | |
96 | |
97 if (i < 4) { | |
98 String[] newTags = new String[i]; | |
99 System.arraycopy(tags, 0, newTags, 0, i); | |
100 tags = newTags; | |
101 | |
102 int[] newCodes = new int[i]; | |
103 System.arraycopy(codes, 0, newCodes, 0, i); | |
104 codes = newCodes; | |
105 } | |
106 | |
107 return new UnicodeReader(new TagReader(source, tags, codes)); | |
108 } | |
109 | |
110 private UnicodeReader mUnicodeReader; | |
111 private TagReader mTagReader; | |
112 private boolean mClosed = false; | |
113 | |
114 // The current line in the source. (1..) | |
115 private int mLine = 1; | |
116 | |
117 private int mFirst; | |
118 | |
119 private String mBeginTag; | |
120 private String mEndTag; | |
121 | |
122 /** | |
123 * The begin and end tags for a SourceReader are optional. If the begin | |
124 * tag is null or has zero length, then the SourceReader starts reading | |
125 * characters as if they were source code. | |
126 * | |
127 * <p>If the end tag is null or has zero length, then a source code | |
128 * region continues to the end of the input Reader's characters. | |
129 * | |
130 * @param source the source reader | |
131 * @param beginTag tag that marks the beginning of a source code region | |
132 * @param endTag tag that marks the end of a source code region | |
133 */ | |
134 public SourceReader(Reader source, String beginTag, String endTag) { | |
135 this(source, beginTag, endTag, false); | |
136 } | |
137 | |
138 /** | |
139 * The begin and end tags for a SourceReader are optional. If the begin | |
140 * tag is null or has zero length, then the SourceReader starts reading | |
141 * characters as if they were source code. | |
142 * | |
143 * <p>If the end tag is null or has zero length, then a source code | |
144 * region continues to the end of the input Reader's characters. | |
145 * | |
146 * @param source the source reader | |
147 * @param beginTag tag that marks the beginning of a source code region | |
148 * @param endTag tag that marks the end of a source code region | |
149 * @param inCode flag that indicates if the stream is starting in code | |
150 */ | |
151 public SourceReader(Reader source, String beginTag, String endTag, | |
152 boolean inCode) { | |
153 super(createReader(source, beginTag, endTag), 2); | |
154 mUnicodeReader = (UnicodeReader)in; | |
155 mTagReader = (TagReader)mUnicodeReader.getOriginalSource(); | |
156 | |
157 boolean codeMode = ((beginTag == null || beginTag.length() == 0) || | |
158 inCode); | |
159 mFirst = (codeMode) ? ENTER_CODE : ENTER_TEXT; | |
160 | |
161 mBeginTag = beginTag; | |
162 mEndTag = endTag; | |
163 } | |
164 | |
165 public String getBeginTag() { | |
166 return mBeginTag; | |
167 } | |
168 | |
169 public String getEndTag() { | |
170 return mEndTag; | |
171 } | |
172 | |
173 /** | |
174 * All newline character patterns are are converted to \n. | |
175 */ | |
176 public int read() throws IOException { | |
177 int c; | |
178 | |
179 if (mFirst != 0) { | |
180 c = mFirst; | |
181 mFirst = 0; | |
182 } | |
183 else { | |
184 c = super.read(); | |
185 } | |
186 | |
187 if (c == '\n') { | |
188 mLine++; | |
189 } | |
190 else if (c == ENTER_CODE) { | |
191 mUnicodeReader.setEscapesEnabled(true); | |
192 } | |
193 else if (c == ENTER_TEXT) { | |
194 mUnicodeReader.setEscapesEnabled(false); | |
195 } | |
196 | |
197 return c; | |
198 } | |
199 | |
200 public int getLineNumber() { | |
201 return mLine; | |
202 } | |
203 | |
204 /** | |
205 * The position in the reader where the last read character ended. The | |
206 * position of the first character read from a Reader is zero. | |
207 * | |
208 * <p>The end position is usually the same as the start position, but | |
209 * sometimes a SourceReader may combine multiple characters into a | |
210 * single one. | |
211 * | |
212 * @return the end position where the last character was read | |
213 */ | |
214 public int getEndPosition() { | |
215 int e = getNextPosition() - 1; | |
216 return (e < getStartPosition()) ? getStartPosition() : e; | |
217 } | |
218 | |
219 public void ignoreTags(boolean ignore) { | |
220 mTagReader.setEscapesEnabled(!ignore); | |
221 } | |
222 | |
223 public boolean isClosed() { | |
224 return mClosed; | |
225 } | |
226 | |
227 public void close() throws IOException { | |
228 mClosed = true; | |
229 super.close(); | |
230 } | |
231 | |
232 protected void unreadHook(int c) { | |
233 if (c == '\n') { | |
234 mLine--; | |
235 } | |
236 else if (c == ENTER_CODE) { | |
237 mUnicodeReader.setEscapesEnabled(false); | |
238 } | |
239 else if (c == ENTER_TEXT) { | |
240 mUnicodeReader.setEscapesEnabled(true); | |
241 } | |
242 } | |
243 | |
244 /** | |
245 * Simple test program | |
246 */ | |
247 public static void main(String[] arg) throws Exception { | |
248 Tester.test(arg); | |
249 } | |
250 | |
251 private static class Tester { | |
252 public static void test(String[] arg) throws Exception { | |
253 String str = | |
254 "This is \\" + "u0061 test.\n" + | |
255 "This is \\" + "u00612 test.\n" + | |
256 "This is \\" + "u0061" + "\\" + "u0061" + " test.\n" + | |
257 "This is \\" + "u061 test.\n" + | |
258 "This is \\\\" + "u0061 test.\n" + | |
259 "This is \\" + "a test.\n" + | |
260 "Plain text <%put code here%> plain text.\n" + | |
261 "Plain text <\\" + "u0025put code here%> plain text.\n" + | |
262 "Plain text <%put code here\\" + "u0025> plain text.\n"; | |
263 | |
264 Reader reader; | |
265 | |
266 if (arg.length > 0) { | |
267 reader = new java.io.FileReader(arg[0]); | |
268 } | |
269 else { | |
270 System.out.println("\nOriginal:\n"); | |
271 | |
272 reader = new StringReader(str); | |
273 | |
274 int c; | |
275 while ( (c = reader.read()) != -1 ) { | |
276 System.out.print((char)c); | |
277 } | |
278 } | |
279 | |
280 System.out.println("\nTest 1:\n"); | |
281 | |
282 if (arg.length > 0) { | |
283 reader = new java.io.FileReader(arg[0]); | |
284 } | |
285 else { | |
286 reader = new StringReader(str); | |
287 } | |
288 | |
289 SourceReader sr = new SourceReader(reader, "<%", "%>"); | |
290 | |
291 int c; | |
292 while ( (c = sr.read()) != -1 ) { | |
293 System.out.print((char)c); | |
294 System.out.print("\t" + c); | |
295 System.out.print("\t" + sr.getLineNumber()); | |
296 System.out.print("\t" + sr.getStartPosition()); | |
297 System.out.println("\t" + sr.getEndPosition()); | |
298 } | |
299 | |
300 System.out.println("\nTest 2:\n"); | |
301 if (arg.length > 0) { | |
302 reader = new java.io.FileReader(arg[0]); | |
303 } | |
304 else { | |
305 reader = new StringReader(str); | |
306 } | |
307 | |
308 sr = new SourceReader(reader, null, null); | |
309 | |
310 while ( (c = sr.read()) != -1 ) { | |
311 System.out.print((char)c); | |
312 System.out.print("\t" + c); | |
313 System.out.print("\t" + sr.getLineNumber()); | |
314 System.out.print("\t" + sr.getStartPosition()); | |
315 System.out.println("\t" + sr.getEndPosition()); | |
316 } | |
317 } | |
318 } | |
319 } |