1
2 package org.apache.commons.configuration.plist;
3
4 /***
5 * An implementation of interface CharStream, where the stream is assumed to
6 * contain only ASCII characters (without unicode processing).
7 */
8
9 class SimpleCharStream
10 {
11 public static final boolean staticFlag = false;
12 int bufsize;
13 int available;
14 int tokenBegin;
15 public int bufpos = -1;
16 protected int bufline[];
17 protected int bufcolumn[];
18
19 protected int column = 0;
20 protected int line = 1;
21
22 protected boolean prevCharIsCR = false;
23 protected boolean prevCharIsLF = false;
24
25 protected java.io.Reader inputStream;
26
27 protected char[] buffer;
28 protected int maxNextCharInd = 0;
29 protected int inBuf = 0;
30
31 protected void ExpandBuff(boolean wrapAround)
32 {
33 char[] newbuffer = new char[bufsize + 2048];
34 int newbufline[] = new int[bufsize + 2048];
35 int newbufcolumn[] = new int[bufsize + 2048];
36
37 try
38 {
39 if (wrapAround)
40 {
41 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
42 System.arraycopy(buffer, 0, newbuffer,
43 bufsize - tokenBegin, bufpos);
44 buffer = newbuffer;
45
46 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
47 System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
48 bufline = newbufline;
49
50 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
51 System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
52 bufcolumn = newbufcolumn;
53
54 maxNextCharInd = (bufpos += (bufsize - tokenBegin));
55 }
56 else
57 {
58 System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
59 buffer = newbuffer;
60
61 System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
62 bufline = newbufline;
63
64 System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
65 bufcolumn = newbufcolumn;
66
67 maxNextCharInd = (bufpos -= tokenBegin);
68 }
69 }
70 catch (Throwable t)
71 {
72 throw new Error(t.getMessage());
73 }
74
75
76 bufsize += 2048;
77 available = bufsize;
78 tokenBegin = 0;
79 }
80
81 protected void FillBuff() throws java.io.IOException
82 {
83 if (maxNextCharInd == available)
84 {
85 if (available == bufsize)
86 {
87 if (tokenBegin > 2048)
88 {
89 bufpos = maxNextCharInd = 0;
90 available = tokenBegin;
91 }
92 else if (tokenBegin < 0)
93 bufpos = maxNextCharInd = 0;
94 else
95 ExpandBuff(false);
96 }
97 else if (available > tokenBegin)
98 available = bufsize;
99 else if ((tokenBegin - available) < 2048)
100 ExpandBuff(true);
101 else
102 available = tokenBegin;
103 }
104
105 int i;
106 try {
107 if ((i = inputStream.read(buffer, maxNextCharInd,
108 available - maxNextCharInd)) == -1)
109 {
110 inputStream.close();
111 throw new java.io.IOException();
112 }
113 else
114 maxNextCharInd += i;
115 return;
116 }
117 catch(java.io.IOException e) {
118 --bufpos;
119 backup(0);
120 if (tokenBegin == -1)
121 tokenBegin = bufpos;
122 throw e;
123 }
124 }
125
126 public char BeginToken() throws java.io.IOException
127 {
128 tokenBegin = -1;
129 char c = readChar();
130 tokenBegin = bufpos;
131
132 return c;
133 }
134
135 protected void UpdateLineColumn(char c)
136 {
137 column++;
138
139 if (prevCharIsLF)
140 {
141 prevCharIsLF = false;
142 line += (column = 1);
143 }
144 else if (prevCharIsCR)
145 {
146 prevCharIsCR = false;
147 if (c == '\n')
148 {
149 prevCharIsLF = true;
150 }
151 else
152 line += (column = 1);
153 }
154
155 switch (c)
156 {
157 case '\r' :
158 prevCharIsCR = true;
159 break;
160 case '\n' :
161 prevCharIsLF = true;
162 break;
163 case '\t' :
164 column--;
165 column += (8 - (column & 07));
166 break;
167 default :
168 break;
169 }
170
171 bufline[bufpos] = line;
172 bufcolumn[bufpos] = column;
173 }
174
175 public char readChar() throws java.io.IOException
176 {
177 if (inBuf > 0)
178 {
179 --inBuf;
180
181 if (++bufpos == bufsize)
182 bufpos = 0;
183
184 return buffer[bufpos];
185 }
186
187 if (++bufpos >= maxNextCharInd)
188 FillBuff();
189
190 char c = buffer[bufpos];
191
192 UpdateLineColumn(c);
193 return (c);
194 }
195
196 /***
197 * @deprecated
198 * @see #getEndColumn
199 */
200
201 public int getColumn() {
202 return bufcolumn[bufpos];
203 }
204
205 /***
206 * @deprecated
207 * @see #getEndLine
208 */
209
210 public int getLine() {
211 return bufline[bufpos];
212 }
213
214 public int getEndColumn() {
215 return bufcolumn[bufpos];
216 }
217
218 public int getEndLine() {
219 return bufline[bufpos];
220 }
221
222 public int getBeginColumn() {
223 return bufcolumn[tokenBegin];
224 }
225
226 public int getBeginLine() {
227 return bufline[tokenBegin];
228 }
229
230 public void backup(int amount) {
231
232 inBuf += amount;
233 if ((bufpos -= amount) < 0)
234 bufpos += bufsize;
235 }
236
237 public SimpleCharStream(java.io.Reader dstream, int startline,
238 int startcolumn, int buffersize)
239 {
240 inputStream = dstream;
241 line = startline;
242 column = startcolumn - 1;
243
244 available = bufsize = buffersize;
245 buffer = new char[buffersize];
246 bufline = new int[buffersize];
247 bufcolumn = new int[buffersize];
248 }
249
250 public SimpleCharStream(java.io.Reader dstream, int startline,
251 int startcolumn)
252 {
253 this(dstream, startline, startcolumn, 4096);
254 }
255
256 public SimpleCharStream(java.io.Reader dstream)
257 {
258 this(dstream, 1, 1, 4096);
259 }
260 public void ReInit(java.io.Reader dstream, int startline,
261 int startcolumn, int buffersize)
262 {
263 inputStream = dstream;
264 line = startline;
265 column = startcolumn - 1;
266
267 if (buffer == null || buffersize != buffer.length)
268 {
269 available = bufsize = buffersize;
270 buffer = new char[buffersize];
271 bufline = new int[buffersize];
272 bufcolumn = new int[buffersize];
273 }
274 prevCharIsLF = prevCharIsCR = false;
275 tokenBegin = inBuf = maxNextCharInd = 0;
276 bufpos = -1;
277 }
278
279 public SimpleCharStream(java.io.InputStream dstream, int startline,
280 int startcolumn, int buffersize)
281 {
282 this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
283 }
284
285 public SimpleCharStream(java.io.InputStream dstream, int startline,
286 int startcolumn)
287 {
288 this(dstream, startline, startcolumn, 4096);
289 }
290
291 public SimpleCharStream(java.io.InputStream dstream)
292 {
293 this(dstream, 1, 1, 4096);
294 }
295
296 public String GetImage()
297 {
298 if (bufpos >= tokenBegin)
299 return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
300 else
301 return new String(buffer, tokenBegin, bufsize - tokenBegin) +
302 new String(buffer, 0, bufpos + 1);
303 }
304
305 public void Done()
306 {
307 buffer = null;
308 bufline = null;
309 bufcolumn = null;
310 }
311
312 }