--- /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
+import java.io.*;\r
+import java.util.*;\r
+\r
+/** This class is a different form of Regex designed to work more\r
+ like the file matching utility of a Unix shell. It is implemented\r
+ by some simple string transformations:\r
+ <center>\r
+ <table border=1>\r
+ <tr> <td> FileRegex </td> <td> Regex </td>\r
+ <tr> <td> * </td><td> .* </td>\r
+ <tr> <td> . </td><td> \. </td>\r
+ <tr> <td> { </td><td> (?: </td>\r
+ <tr> <td> {?! </td><td> (?! </td>\r
+ <tr> <td> {?= </td><td> (?= </td>\r
+ <tr> <td> {?? </td><td> (?? </td>\r
+ <tr> <td> } </td><td> ) </td>\r
+ <tr> <td> ? </td><td> . </td>\r
+ <tr> <td> {,} </td><td> (|) </td>\r
+ </table>\r
+ </center>\r
+ Note that a FileRegex pattern always ends with the Regex\r
+ pattern element "$". If you like to experiment, try making\r
+ FileRegex's and then printing them out. The toString() method\r
+ does a decompile of the pattern to a standard Regex. Here are\r
+ some more complete examples:\r
+ <center>\r
+ <table border=3>\r
+ <tr> <td> FileRegex </td><td> Regex </td>\r
+ <tr> <td>*.java </td><td> .*\.java$ </td>\r
+ <tr> <td>*.{java,html} </td><td> .*\.(java|html)$ </td>\r
+ <tr> <td> foo.[chC] </td><td> foo.[chC]$ </td>\r
+ </table>\r
+ </center>\r
+ */\r
+public class FileRegex extends Regex {\r
+ /** Build an unitialized FileRegex. */\r
+ public FileRegex() { dirflag=EITHER; }\r
+ /** Build a FileRegex form String s. */\r
+ public FileRegex(String s) {\r
+ super(s);\r
+ dirflag = EITHER;\r
+ }\r
+ /** Compile a new pattern.\r
+ Throws @exception com.stevesoft.pat.RegSyntax for\r
+ nonsensical patterns like "[9-0]+" just as Regex does.\r
+ @see com.stevesoft.pat#compile(java.lang.String)\r
+ */\r
+ public void compile(String s) throws RegSyntax {\r
+ String npat = toFileRegex(s);\r
+ super.compile(npat);\r
+ if(File.separatorChar == '\\') // MS-DOS\r
+ ignoreCase = true;\r
+ }\r
+ /** This is the method required by FileNameFilter.\r
+ To get a listing of files in the current directory\r
+ ending in .java, do this:\r
+ <pre>\r
+ File dot = new File(".");\r
+ FileRegex java_files = new FileRegex("*.java");\r
+ String[] file_list = dot.list(java_files);\r
+ </pre>\r
+ */\r
+ public boolean accept(File dir,String s) {\r
+ if(dirflag != EITHER) {\r
+ File f = new File(s);\r
+ if(f.isDirectory() && dirflag == NONDIR)\r
+ return false;\r
+ if(!f.isDirectory() && dirflag == DIR)\r
+ return false;\r
+ }\r
+ return matchAt(s,0);\r
+ }\r
+ int dirflag = 0;\r
+ final static int EITHER=0,DIR=1,NONDIR=2;\r
+\r
+ /** Provides an alternative to File.list -- this\r
+ separates its argument according to File.pathSeparator.\r
+ To each path, it splits off a directory -- all characters\r
+ up to and including the first instance of File.separator --\r
+ and a file pattern -- the part that comes after the directory.\r
+ It then produces a list of all the pattern matches on all\r
+ the paths. Thus "*.java:../*.java" would produce a list of\r
+ all the java files in this directory and in the ".." directory\r
+ on a Unix machine. "*.java;..\\*.java" would do the same thing\r
+ on a Dos machine. */\r
+ public static String[] list(String f) {\r
+ return list(f,EITHER);\r
+ }\r
+ static String[] list(String f,int df) {\r
+ //return list_(f,new FileRegex());\r
+ StringTokenizer st = new StringTokenizer(f,File.pathSeparator);\r
+ Vector v = new Vector();\r
+ while(st.hasMoreTokens()) {\r
+ String path = st.nextToken();\r
+ list1(path,v,df,true);\r
+ }\r
+ String[] sa = new String[v.size()];\r
+ v.copyInto(sa);\r
+ return sa;\r
+ }\r
+ final static Regex root=new Regex(File.separatorChar=='/' ?\r
+ "/$" : "(?:.:|)\\\\$");\r
+ static void list1(String path,Vector v,int df,boolean rec) {\r
+ // if path looks like a/b/c/ or d:\ then add .\r
+ if(root.matchAt(path,0)) {\r
+ v.addElement(path+".");\r
+ return;\r
+ }\r
+ File f = new File(path);\r
+ if(f.getParent() != null && rec) {\r
+ Vector v2 = new Vector();\r
+ list1(f.getParent(),v2,DIR,true);\r
+ for(int i=0;i<v2.size();i++) {\r
+ String path2 = ((String)v2.elementAt(i))+\r
+ File.separator+f.getName();\r
+ list1(path2,v,df,false);\r
+ }\r
+ } else {\r
+ File base = new File(path);\r
+\r
+ String dir_s = base.getParent();\r
+ if(dir_s==null) dir_s=".";\r
+ File dir = new File(dir_s);\r
+\r
+ FileRegex fr = new FileRegex(base.getName());\r
+ if(fr.isLiteral()) {\r
+ v.addElement(dir_s+File.separator+base.getName());\r
+ return;\r
+ }\r
+ fr.dirflag = df;\r
+ String[] sa = dir.list(fr);\r
+ if(sa == null) return;\r
+ for(int i=0;i<sa.length;i++) {\r
+ v.addElement(dir_s+File.separator+sa[i]);\r
+ }\r
+ }\r
+ }\r
+\r
+ /** This method takes a file regular expression, and translates it\r
+ into the type of pattern used by a normal Regex. */\r
+ public static String toFileRegex(String s) {\r
+ StrPos sp = new StrPos(s,0);\r
+ StringBuffer sb = new StringBuffer();\r
+ if(sp.incMatch("{?e=")) {\r
+ char e = sp.thisChar();\r
+ sp.inc();\r
+ if(sp.incMatch("}")) {\r
+ sb.append("(?e="+e+")^");\r
+ } else {\r
+ sb.append("^(?e=");\r
+ }\r
+ sp.esc = e;\r
+ }\r
+ int ParenLvl = 0;\r
+ while(!sp.eos()) {\r
+ if(File.separatorChar == '\\') {\r
+ if(sp.escaped())\r
+ sb.append("\\\\");\r
+ sp.dontMatch = false;\r
+ }\r
+ if(sp.incMatch("?"))\r
+ sb.append(".");\r
+ else if(sp.incMatch(".")) {\r
+ sb.append(sp.esc);\r
+ sb.append('.');\r
+ } else if(sp.incMatch("{??")) {\r
+ sb.append("(??");\r
+ ParenLvl++;\r
+ // allow negative lookahead to work\r
+ } else if(sp.incMatch("{?!")) {\r
+ sb.append("(?!");\r
+ ParenLvl++;\r
+ // allow positive lookahead to work\r
+ } else if(sp.incMatch("{?=")) {\r
+ sb.append("(?=");\r
+ ParenLvl++;\r
+ } else if(sp.incMatch("{")) {\r
+ sb.append("(?:");\r
+ ParenLvl++;\r
+ } else if(sp.incMatch("}")) {\r
+ sb.append(')');\r
+ ParenLvl--;\r
+ } else if(ParenLvl != 0 && sp.incMatch(","))\r
+ sb.append('|');\r
+ else if(sp.incMatch("*"))\r
+ sb.append(".*");\r
+ else {\r
+ sb.append(sp.thisChar());\r
+ sp.inc();\r
+ }\r
+ }\r
+ sb.append("$");\r
+ return sb.toString();\r
+ }\r
+ public boolean isLiteral() {\r
+ Pattern x = thePattern;\r
+ while(x != null && !(x instanceof End)) {\r
+ if(x instanceof oneChar)\r
+ ;\r
+ else if(x instanceof Skipped)\r
+ ;\r
+ else return false;\r
+ x = x.next;\r
+ }\r
+ return true;\r
+ }\r
+}\r
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