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1
4 package gnu.kawa.util;
5 import java.io.*;
6 import java.util.*;
7
8
9
10 public class PreProcess
11 {
12 Hashtable keywords = new Hashtable();
15
16 String  filename;
17 int lineno;
18
19 void error(String msg)
20 {
21 System.err.println(filename+':'+lineno+": "+msg);
22 System.exit(-1);
23 }
24
25 public void filter (String filename) throws Throwable
26 {
27 this.filename = filename;
28 boolean changed = false;
29 BufferedInputStream in
30 = new BufferedInputStream(new FileInputStream(filename));
31
32 byte[] buf = new byte[2000];
33 int len = 0;;
34 int lineStart = 0;
35 int dataStart = -1;
36 int cmdLine= 0;
37 lineno = 1;
38 int commentAt = -1;
40 int curIndent = 0;
41 int nesting = 0;
42 int skipNesting = 0;
45 String cmd = null;
46 int changedLine = 0; for (;;)
48 {
49 int c = in.read();
50 if (c < 0)
51 break;
52 if (len + 10 >= buf.length) {
54 byte[] nbuf = new byte[2 * len];
55 System.arraycopy(buf, 0, nbuf, 0, len);
56 buf = nbuf;
57 }
58 if (c == '\n' && len > 0 && buf[len-1] == '\r')
59 {
60 buf[len++] = (byte) c;
61 continue;
62 }
63 if (commentAt >= 0 && dataStart < 0 && changedLine <= 0
64 && c != '\r' && c != '\n'
65 && (commentAt == curIndent
66 || (c != ' ' && c != '\t')))
67 {
68 boolean doComment;
69 if (c == '/')
70 {
71 in.mark(100);
77 int d = in.read();
78 if (d == '/')
79 doComment = false;
80 else if (d == '*')
81 {
82 do { d = in.read(); } while (d == ' ' || d == '\t');
83 doComment = d != '#';
84 }
85 else
86 doComment = true;
87 in.reset();
88 }
89 else
90 doComment = true;
91 if (doComment)
92 {
93 buf[len++] = '/';
94 buf[len++] = '/';
95 buf[len++] = ' ';
96 changedLine = 1;
97 changed = true;
98 }
99 }
100 if (c != ' ' && c != '\t' && dataStart < 0)
101 {
102 dataStart = len;
104 if (nesting > 0 && commentAt != curIndent && c == '/')
105 {
106 c = in.read();
107 if (c < 0)
108 break;
109 else if (c != '/')
110 buf[len++] = '/';
111 else
112 {
113 c = in.read();
114 if (c < 0)
115 break;
116 changedLine = -1;
117 changed = true;
118 if (c == ' ')
119 {
120 c = in.read();
121 if (c == ' ' || c == '\t')
122 dataStart = -1;
123 }
124 }
125 }
126 }
127 buf[len] = (byte) c;
128 len++;
129 if (c == '\r' || c == '\n')
130 {
131 int firstNonSpace = -1;
132 int lastNonSpace = 0;
133 for (int i = lineStart; i < len-1; i++)
134 {
135 if (buf[i] != ' ' && buf[i] != '\t')
136 {
137 lastNonSpace = i;
138 if (firstNonSpace < 0)
139 firstNonSpace = i;
140 }
141 }
142 if (lastNonSpace - firstNonSpace >= 4
143 && buf[firstNonSpace] == '/'
144 && buf[firstNonSpace+1] == '*'
145 && buf[lastNonSpace-1] == '*'
146 && buf[lastNonSpace] == '/')
147 {
148 firstNonSpace += 2;
149 while (firstNonSpace < lastNonSpace
150 && buf[firstNonSpace] == ' ')
151 firstNonSpace++;
152 lastNonSpace -= 2;
153 while (lastNonSpace > firstNonSpace
154 && buf[lastNonSpace] == ' ')
155 lastNonSpace--;
156 if (buf[firstNonSpace] == '#')
157 {
158 String cmnt = new String (buf, firstNonSpace,
159 lastNonSpace - firstNonSpace + 1,
160 "ISO-8859-1");
161 int sp = cmnt.indexOf(' ');
162 String rest;
163 Object binding;
164 cmdLine = lineno;
165 if (sp > 0)
166 {
167 cmd = cmnt.substring(0, sp);
168 rest = cmnt.substring(sp).trim();
169 binding = keywords.get(rest);
170 }
171 else
172 {
173 cmd = cmnt;
174 rest = "";
175 binding = null;
176 }
177 if ("#ifdef".equals(cmd) || "#ifndef".equals(cmd))
178 {
179 if (binding == null)
180 {
181 System.err.println(filename+":"+lineno
182 +": warning - undefined keyword: "+rest);
183 binding = Boolean.FALSE;
184 }
185 nesting++;
186 if (skipNesting > 0)
187 commentAt = curIndent;
188 else if ((cmd.charAt(3) == 'n')
189 != (binding == Boolean.FALSE))
190 {
191 commentAt = curIndent;
192 skipNesting = nesting;
193 }
194 }
195 else if ("#else".equals(cmd))
196 {
197 if (nesting == 0)
198 error("unexpected "+cmd);
199 else if (nesting == skipNesting)
200 {
201 commentAt = -1;
202 skipNesting = 0;
203 }
204 else
205 {
206 commentAt = curIndent;
207 if (skipNesting == 0)
208 skipNesting = nesting;
209 }
210 }
211 else if ("#endif".equals(cmd))
212 {
213 if (nesting == 0)
214 error("unexpected "+cmd);
215 if (nesting == skipNesting)
216 {
217 skipNesting = 0;
218 commentAt = -1;
219 }
220 else if (skipNesting > 0)
221 commentAt = curIndent;
222 nesting--;
223 }
224 else
225 error("unknown command: "+cmnt);
226 }
227 }
228 lineStart = len;
229 dataStart = -1;
230 curIndent = 0;
231 lineno++;
232 changedLine = 0;
233 }
234 else if (dataStart < 0)
235 curIndent = c == '\t' ? (curIndent + 8) & ~7 : curIndent + 1;
236 }
237 if (nesting != 0)
238 {
239 lineno = cmdLine;
240 error("unterminated "+cmd);
241 }
242 if (changed)
243 {
244 FileOutputStream out = new FileOutputStream(filename);
245 out.write(buf, 0, len);
246 out.close();
247 System.err.println("Pre-processed "+filename);
248 }
249 }
250
251 public static void main (String [] args)
252 {
253 PreProcess pp = new PreProcess();
254
255 pp.keywords.put("true", Boolean.TRUE);
256 pp.keywords.put("false", Boolean.FALSE);
257
258 for (int i = 0; i < args.length; i++)
259 {
260 String arg = args[i];
261 if (arg.charAt(0) == '+')
262 pp.keywords.put(arg.substring(1), Boolean.TRUE);
263 else if (arg.charAt(0) == '-')
264 {
265 int eq = arg.indexOf('=');
266 if (eq > 1)
267 {
268 String keyword
269 = arg.substring(arg.charAt(1) == '-' ? 2 :1, eq);
270 String value = arg.substring(eq+1);
271 Boolean b = Boolean.FALSE;
272 if (value.equalsIgnoreCase("true"))
273 b = Boolean.TRUE;
274 else if (! value.equalsIgnoreCase("false"))
275 {
276 System.err.println("invalid value "+value+" for "+keyword);
277 System.exit(-1);
278 }
279 pp.keywords.put(keyword, b);
280 }
281 else
282 pp.keywords.put(arg.substring(1), Boolean.FALSE);
283 }
284 else
285 {
286 try
287 {
288 pp.filter(arg);
289 }
290 catch (Throwable ex)
291 {
292 System.err.println("caught "+ex);
293 ex.printStackTrace();
294 System.exit(-1);
295 }
296 }
297 }
298 }
299 }
300 |
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