--- /dev/null
+//\r
+// This software is now distributed according to\r
+// the Lesser Gnu Public License. Please see\r
+// http://www.gnu.org/copyleft/lesser.txt for\r
+// the details.\r
+// -- Happy Computing!\r
+//\r
+package com.stevesoft.pat;\r
+\r
+import java.io.*;\r
+import com.stevesoft.pat.wrap.*;\r
+\r
+/** A basic extension of FilterWriter that uses Transformer\r
+ to make replacements in data as it is written out. It attempts\r
+ to transform a string whenever the End-of-Line (EOL) character\r
+ is written (which is, by default, the carriage return '\n').\r
+ Only the transformed portion of the line is written out, allowing\r
+ the RegexWriter to wait until a complete pattern is present before\r
+ attempting to write out info. Until a pattern completes, data is\r
+ stored in a StringBuffer -- which can be accessed through the\r
+ length() and charAt() methods of this class.\r
+ <p>\r
+ Note a subtlety here -- while a Transformer normally matches\r
+ at higher priority against the pattern added to it first, this\r
+ will not necessarily be true when a multi-line match is in progress\r
+ because one of the complete multi-line patterns may not be completely\r
+ loaded in RegexWriter's buffer. For this reason, the Transformer\r
+ class is equipped with a way to add a pattern and replacement rule\r
+ in three pieces -- a beginning (once this matches, nothing else in\r
+ the Transformer can match until the whole pattern matches), an\r
+ ending (the whole pattern is a String formed by adding the beginning\r
+ and ending), and a ReplaceRule.\r
+ <p>\r
+ An illustration of this is given in the this\r
+ <a href="../test/trans.java">example.</a>\r
+ */\r
+public class RegexWriter extends Writer {\r
+ Replacer repr;\r
+ Writer w;\r
+ WriterWrap ww;\r
+ StringBuffer sb = new StringBuffer();\r
+ PartialBuffer wrap = new PartialBuffer(sb);\r
+ int pos, epos;\r
+ int interval = 128;\r
+ int bufferSize = 2*1024;\r
+\r
+ public RegexWriter(Transformer t,Writer w) {\r
+ this.w = w;\r
+ ww = new WriterWrap(w);\r
+ repr = t.getReplacer();\r
+ repr.setBuffer(new StringBufferLike(ww));\r
+ repr.setSource(wrap);\r
+ }\r
+ public RegexWriter(Regex r,Writer w) {\r
+ this.w = w;\r
+ ww = new WriterWrap(w);\r
+ repr = r.getReplacer();\r
+ repr.setBuffer(new StringBufferLike(ww));\r
+ repr.setSource(wrap);\r
+ }\r
+\r
+ char EOLchar = '\n';\r
+ /** This method no longer serves any purpose.\r
+ @deprecated\r
+ */\r
+ public char getEOLchar() {\r
+ return EOLchar;\r
+ }\r
+ /** This method no longer serves any purpose.\r
+ @deprecated\r
+ */\r
+ public void setEOLchar(char c) {\r
+ EOLchar = c;\r
+ }\r
+\r
+ int max_lines=2;\r
+ /** This method no longer serves any purpose.\r
+ @deprecated\r
+ */\r
+ public int getMaxLines() { return max_lines; }\r
+ /** This method no longer serves any purpose.\r
+ @deprecated\r
+ */\r
+ public void setMaxLines(int ml) { max_lines = ml; }\r
+\r
+ void write() throws IOException {\r
+ Regex rex = repr.getRegex();\r
+ int eposOld = epos;\r
+ if(rex.matchAt(wrap,epos) && !wrap.overRun) {\r
+ while(pos < epos)\r
+ w.write(sb.charAt(pos++));\r
+ int to = rex.matchedTo();\r
+ repr.setPos(to);\r
+ repr.apply(rex,rex.getReplaceRule());\r
+ epos = pos = to;\r
+ if(epos == eposOld && epos < sb.length())\r
+ epos++;\r
+ } else if(!wrap.overRun && epos < sb.length()) {\r
+ epos++;\r
+ }\r
+ while(pos < epos)\r
+ w.write(sb.charAt(pos++));\r
+ if(epos == sb.length()) {\r
+ sb.setLength(1);\r
+ pos = epos = 1;\r
+ } else if(pos > bufferSize) {\r
+ for(int i=bufferSize;i<sb.length();i++)\r
+ sb.setCharAt(i-bufferSize,sb.charAt(i));\r
+ pos -= bufferSize;\r
+ epos -= bufferSize;\r
+ sb.setLength(sb.length()-bufferSize);\r
+ }\r
+ }\r
+\r
+ public void write(char[] ca,int b,int n) throws IOException {\r
+ int m = b+n;\r
+ for(int i=b;i<m;i++) {\r
+ sb.append(ca[i]);\r
+ if(sb.length() % interval == interval - 1) {\r
+ wrap.overRun = false;\r
+ while(epos+interval < sb.length() && !wrap.overRun) {\r
+ write();\r
+ }\r
+ }\r
+ }\r
+ }\r
+\r
+ public void flush() throws IOException {\r
+ }\r
+\r
+ public void close() throws IOException {\r
+ wrap.allowOverRun = false;\r
+ wrap.overRun = false;\r
+ while(epos < sb.length())\r
+ write();\r
+ write();\r
+ w.close();\r
+ }\r
+\r
+ /** The current size of the StringBuffer in use by RegexWriter. */\r
+ public int length() { return sb.length(); }\r
+\r
+ /** The character at location i in the StringBuffer. */\r
+ public char charAt(int i) { return sb.charAt(i); }\r
+\r
+ /** Set the interval at which regex patterns are checked. */\r
+ public void setInterval(int i) {\r
+ interval = i;\r
+ }\r
+\r
+ /** Get the interval at which regex matches are checked. */\r
+ public int getInterval() {\r
+ return interval;\r
+ }\r
+\r
+ /** Get the buffer size. */\r
+ public int getBufferSize() {\r
+ return bufferSize;\r
+ }\r
+\r
+ /** Set the buffer size. */\r
+ public void setBufferSize(int i) {\r
+ bufferSize = i;\r
+ }\r
+\r
+ static void test(String re,String inp,int n) throws Exception {\r
+ StringWriter sw = new StringWriter();\r
+ Regex rex = Regex.perlCode(re);\r
+ String res1 = rex.replaceAll(inp);\r
+ RegexWriter rw = new RegexWriter(rex,sw);\r
+ for(int i=0;i<inp.length();i++)\r
+ rw.write(inp.charAt(i));\r
+ rw.close();\r
+ String res2 = sw.toString();\r
+ if(!res1.equals(res2)) {\r
+ System.out.println("nmax="+n);\r
+ System.out.println("re="+re);\r
+ System.out.println("inp="+inp);\r
+ System.out.println("res1="+res1);\r
+ System.out.println("res2="+res2);\r
+ System.exit(255);\r
+ }\r
+ }\r
+ public static void main(String[] args) throws Exception {\r
+ for(int n=1;n<=1;n++) {\r
+ test("s/x/y/","-----x123456789",n);\r
+ test("s/x/y/","x123456789",n);\r
+ test("s/x/y/","-----x",n);\r
+ test("s/x.*?x/y/",".xx..x..x...x...x....x....x",n);\r
+ test("s/x.*x/[$&]/","--x........x--xx",n);\r
+ test("s/x.*x/[$&]/","--x........x------",n);\r
+ test("s/.$/a/m","bb\nbbb\nbbbb\nbbbbb\nbbbbbb\nbbbbbbbbbbbb",n);\r
+ test("s/.$/a/","123",n);\r
+ test("s/.$/a/","bb\nbbb\nbbbb\nbbbbb\nbbbbbb\nbb",n);\r
+ test("s/^./a/","bb\nbbb\nbbbb\nbbbbb\nbbbbbb\nbb",n);\r
+ test("s/$/a/","bbb",n);\r
+ test("s/^/a/","bbb",n);\r
+ test("s/^/a/","",n);\r
+ test("s{.*}{N}","xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",n);\r
+ test("s/.{0,7}/y/","AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",n);\r
+ test("s/x/$&/","xxx",n);\r
+ }\r
+ System.out.println("Success!!!");\r
+ }\r
+}\r
git://source.jalview.org / jalview.git / blobdiff