- Note a subtlety here -- while a Transformer normally matches - at higher priority against the pattern added to it first, this - will not necessarily be true when a multi-line match is in progress - because one of the complete multi-line patterns may not be completely - loaded in RegexWriter's buffer. For this reason, the Transformer - class is equipped with a way to add a pattern and replacement rule - in three pieces -- a beginning (once this matches, nothing else in - the Transformer can match until the whole pattern matches), an - ending (the whole pattern is a String formed by adding the beginning - and ending), and a ReplaceRule. -
- An illustration of this is given in the this
- example.
- */
-public class RegexWriter extends Writer {
- Replacer repr;
- Writer w;
- WriterWrap ww;
- StringBuffer sb = new StringBuffer();
- PartialBuffer wrap = new PartialBuffer(sb);
- int pos, epos;
- int interval = 128;
- int bufferSize = 2*1024;
-
- public RegexWriter(Transformer t,Writer w) {
- this.w = w;
- ww = new WriterWrap(w);
- repr = t.getReplacer();
- repr.setBuffer(new StringBufferLike(ww));
- repr.setSource(wrap);
- }
- public RegexWriter(Regex r,Writer w) {
- this.w = w;
- ww = new WriterWrap(w);
- repr = r.getReplacer();
- repr.setBuffer(new StringBufferLike(ww));
- repr.setSource(wrap);
- }
-
- char EOLchar = '\n';
- /** This method no longer serves any purpose.
- @deprecated
- */
- public char getEOLchar() {
- return EOLchar;
- }
- /** This method no longer serves any purpose.
- @deprecated
- */
- public void setEOLchar(char c) {
- EOLchar = c;
- }
-
- int max_lines=2;
- /** This method no longer serves any purpose.
- @deprecated
- */
- public int getMaxLines() { return max_lines; }
- /** This method no longer serves any purpose.
- @deprecated
- */
- public void setMaxLines(int ml) { max_lines = ml; }
-
- void write() throws IOException {
- Regex rex = repr.getRegex();
- int eposOld = epos;
- if(rex.matchAt(wrap,epos) && !wrap.overRun) {
- while(pos < epos)
- w.write(sb.charAt(pos++));
- int to = rex.matchedTo();
- repr.setPos(to);
- repr.apply(rex,rex.getReplaceRule());
- epos = pos = to;
- if(epos == eposOld && epos < sb.length())
- epos++;
- } else if(!wrap.overRun && epos < sb.length()) {
- epos++;
- }
- while(pos < epos)
- w.write(sb.charAt(pos++));
- if(epos == sb.length()) {
- sb.setLength(1);
- pos = epos = 1;
- } else if(pos > bufferSize) {
- for(int i=bufferSize;i
+ * An illustration of this is given in the this example.
+ */
+public class RegexWriter extends Writer
+{
+ Replacer repr;
+
+ Writer w;
+
+ WriterWrap ww;
+
+ StringBuffer sb = new StringBuffer();
+
+ PartialBuffer wrap = new PartialBuffer(sb);
+
+ int pos, epos;
+
+ int interval = 128;
+
+ int bufferSize = 2 * 1024;
+
+ public RegexWriter(Transformer t, Writer w)
+ {
+ this.w = w;
+ ww = new WriterWrap(w);
+ repr = t.getReplacer();
+ repr.setBuffer(new StringBufferLike(ww));
+ repr.setSource(wrap);
+ }
+
+ public RegexWriter(Regex r, Writer w)
+ {
+ this.w = w;
+ ww = new WriterWrap(w);
+ repr = r.getReplacer();
+ repr.setBuffer(new StringBufferLike(ww));
+ repr.setSource(wrap);
+ }
+
+ char EOLchar = '\n';
+
+ /**
+ * This method no longer serves any purpose.
+ *
+ * @deprecated
+ */
+ @Deprecated
+ public char getEOLchar()
+ {
+ return EOLchar;
+ }
+
+ /**
+ * This method no longer serves any purpose.
+ *
+ * @deprecated
+ */
+ @Deprecated
+ public void setEOLchar(char c)
+ {
+ EOLchar = c;
+ }
+
+ int max_lines = 2;
+
+ /**
+ * This method no longer serves any purpose.
+ *
+ * @deprecated
+ */
+ @Deprecated
+ public int getMaxLines()
+ {
+ return max_lines;
+ }
+
+ /**
+ * This method no longer serves any purpose.
+ *
+ * @deprecated
+ */
+ @Deprecated
+ public void setMaxLines(int ml)
+ {
+ max_lines = ml;
+ }
+
+ void write() throws IOException
+ {
+ Regex rex = repr.getRegex();
+ int eposOld = epos;
+ if (rex.matchAtLike(wrap, epos) && !wrap.overRun)
+ {
+ while (pos < epos)
+ {
+ w.write(sb.charAt(pos++));
+ }
+ int to = rex.matchedTo();
+ repr.setPos(to);
+ repr.apply(rex, rex.getReplaceRule());
+ epos = pos = to;
+ if (epos == eposOld && epos < sb.length())
+ {
+ epos++;
+ }
+ }
+ else if (!wrap.overRun && epos < sb.length())
+ {
+ epos++;
+ }
+ while (pos < epos)
+ {
+ w.write(sb.charAt(pos++));
+ }
+ if (epos == sb.length())
+ {
+ sb.setLength(1);
+ pos = epos = 1;
+ }
+ else if (pos > bufferSize)
+ {
+ for (int i = bufferSize; i < sb.length(); i++)
+ {
+ sb.setCharAt(i - bufferSize, sb.charAt(i));
+ }
+ pos -= bufferSize;
+ epos -= bufferSize;
+ sb.setLength(sb.length() - bufferSize);
+ }
+ }
+
+ public void write(char[] ca, int b, int n) throws IOException
+ {
+ int m = b + n;
+ for (int i = b; i < m; i++)
+ {
+ sb.append(ca[i]);
+ if (sb.length() % interval == interval - 1)
+ {
+ wrap.overRun = false;
+ while (epos + interval < sb.length() && !wrap.overRun)
+ {
+ write();
+ }
+ }
+ }
+ }
+
+ public void flush() throws IOException
+ {
+ }
+
+ public void close() throws IOException
+ {
+ wrap.allowOverRun = false;
+ wrap.overRun = false;
+ while (epos < sb.length())
+ {
+ write();
+ }
+ write();
+ w.close();
+ }
+
+ /** The current size of the StringBuffer in use by RegexWriter. */
+ public int length()
+ {
+ return sb.length();
+ }
+
+ /** The character at location i in the StringBuffer. */
+ public char charAt(int i)
+ {
+ return sb.charAt(i);
+ }
+
+ /** Set the interval at which regex patterns are checked. */
+ public void setInterval(int i)
+ {
+ interval = i;
+ }
+
+ /** Get the interval at which regex matches are checked. */
+ public int getInterval()
+ {
+ return interval;
+ }
+
+ /** Get the buffer size. */
+ public int getBufferSize()
+ {
+ return bufferSize;
+ }
+
+ /** Set the buffer size. */
+ public void setBufferSize(int i)
+ {
+ bufferSize = i;
+ }
+}