/** ******************************************************************************* * Copyright (C) 1996-2010, International Business Machines Corporation and * * others. All Rights Reserved. * ******************************************************************************* */ // copied from the Transliterator demo package com.ibm.icu.dev.test.util; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.Map; import java.util.Set; import java.util.TreeSet; import com.ibm.icu.lang.UCharacter; import com.ibm.icu.text.Transliterator; import com.ibm.icu.text.UTF16; import com.ibm.icu.text.UnicodeSet; /** * Incrementally returns the set of all strings that case-fold to the same value. */ public class CaseIterator { // testing stuff private static Transliterator toName = Transliterator.getInstance("[:^ascii:] Any-Name"); private static Transliterator toHex = Transliterator.getInstance("[:^ascii:] Any-Hex"); private static Transliterator toHex2 = Transliterator.getInstance("[[^\u0021-\u007F]-[,]] Any-Hex"); // global tables (could be precompiled) private static Map fromCaseFold = new HashMap(); private static Map toCaseFold = new HashMap(); private static int maxLength = 0; // This exception list is generated on the console by turning on the GENERATED flag, // which MUST be false for normal operation. // Once the list is generated, it is pasted in here. // A bit of a cludge, but this bootstrapping is the easiest way // to get around certain complications in the data. private static final boolean GENERATE = false; private static final boolean DUMP = false; private static String[][] exceptionList = { // a\N{MODIFIER LETTER RIGHT HALF RING} {"a\u02BE","A\u02BE","a\u02BE",}, // ff {"ff","FF","Ff","fF","ff",}, // ffi {"ffi","FFI","FFi","FfI","Ffi","F\uFB01","fFI","fFi","ffI","ffi","f\uFB01","\uFB00I","\uFB00i",}, // ffl {"ffl","FFL","FFl","FfL","Ffl","F\uFB02","fFL","fFl","ffL","ffl","f\uFB02","\uFB00L","\uFB00l",}, // fi {"fi","FI","Fi","fI","fi",}, // fl {"fl","FL","Fl","fL","fl",}, // h\N{COMBINING MACRON BELOW} {"h\u0331","H\u0331","h\u0331",}, // i\N{COMBINING DOT ABOVE} {"i\u0307","I\u0307","i\u0307",}, // j\N{COMBINING CARON} {"j\u030C","J\u030C","j\u030C",}, // ss {"ss","SS","Ss","S\u017F","sS","ss","s\u017F","\u017FS","\u017Fs","\u017F\u017F",}, // st {"st","ST","St","sT","st","\u017FT","\u017Ft",}, // t\N{COMBINING DIAERESIS} {"t\u0308","T\u0308","t\u0308",}, // w\N{COMBINING RING ABOVE} {"w\u030A","W\u030A","w\u030A",}, // y\N{COMBINING RING ABOVE} {"y\u030A","Y\u030A","y\u030A",}, // \N{MODIFIER LETTER APOSTROPHE}n {"\u02BCn","\u02BCN","\u02BCn",}, // \N{GREEK SMALL LETTER ALPHA WITH TONOS}\N{GREEK SMALL LETTER IOTA} {"\u03AC\u03B9","\u0386\u0345","\u0386\u0399","\u0386\u03B9","\u0386\u1FBE","\u03AC\u0345","\u03AC\u0399","\u03AC\u03B9","\u03AC\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH TONOS}\N{GREEK SMALL LETTER IOTA} {"\u03AE\u03B9","\u0389\u0345","\u0389\u0399","\u0389\u03B9","\u0389\u1FBE","\u03AE\u0345","\u03AE\u0399","\u03AE\u03B9","\u03AE\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA}\N{COMBINING GREEK PERISPOMENI} {"\u03B1\u0342","\u0391\u0342","\u03B1\u0342",}, // \N{GREEK SMALL LETTER ALPHA}\N{COMBINING GREEK PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u03B1\u0342\u03B9","\u0391\u0342\u0345","\u0391\u0342\u0399","\u0391\u0342\u03B9","\u0391\u0342\u1FBE", "\u03B1\u0342\u0345","\u03B1\u0342\u0399","\u03B1\u0342\u03B9","\u03B1\u0342\u1FBE","\u1FB6\u0345", "\u1FB6\u0399","\u1FB6\u03B9","\u1FB6\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA}\N{GREEK SMALL LETTER IOTA} {"\u03B1\u03B9","\u0391\u0345","\u0391\u0399","\u0391\u03B9","\u0391\u1FBE","\u03B1\u0345","\u03B1\u0399","\u03B1\u03B9","\u03B1\u1FBE",}, // \N{GREEK SMALL LETTER ETA}\N{COMBINING GREEK PERISPOMENI} {"\u03B7\u0342","\u0397\u0342","\u03B7\u0342",}, // \N{GREEK SMALL LETTER ETA}\N{COMBINING GREEK PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u03B7\u0342\u03B9","\u0397\u0342\u0345","\u0397\u0342\u0399","\u0397\u0342\u03B9","\u0397\u0342\u1FBE", "\u03B7\u0342\u0345","\u03B7\u0342\u0399","\u03B7\u0342\u03B9","\u03B7\u0342\u1FBE","\u1FC6\u0345","\u1FC6\u0399", "\u1FC6\u03B9","\u1FC6\u1FBE",}, // \N{GREEK SMALL LETTER ETA}\N{GREEK SMALL LETTER IOTA} {"\u03B7\u03B9","\u0397\u0345","\u0397\u0399","\u0397\u03B9","\u0397\u1FBE","\u03B7\u0345","\u03B7\u0399","\u03B7\u03B9","\u03B7\u1FBE",}, // \N{GREEK SMALL LETTER IOTA}\N{COMBINING DIAERESIS}\N{COMBINING GRAVE ACCENT} {"\u03B9\u0308\u0300","\u0345\u0308\u0300","\u0399\u0308\u0300","\u03B9\u0308\u0300","\u1FBE\u0308\u0300",}, // \N{GREEK SMALL LETTER IOTA}\N{COMBINING DIAERESIS}\N{COMBINING ACUTE ACCENT} {"\u03B9\u0308\u0301","\u0345\u0308\u0301","\u0399\u0308\u0301","\u03B9\u0308\u0301","\u1FBE\u0308\u0301",}, // \N{GREEK SMALL LETTER IOTA}\N{COMBINING DIAERESIS}\N{COMBINING GREEK PERISPOMENI} {"\u03B9\u0308\u0342","\u0345\u0308\u0342","\u0399\u0308\u0342","\u03B9\u0308\u0342","\u1FBE\u0308\u0342",}, // \N{GREEK SMALL LETTER IOTA}\N{COMBINING GREEK PERISPOMENI} {"\u03B9\u0342","\u0345\u0342","\u0399\u0342","\u03B9\u0342","\u1FBE\u0342",}, // \N{GREEK SMALL LETTER RHO}\N{COMBINING COMMA ABOVE} {"\u03C1\u0313","\u03A1\u0313","\u03C1\u0313","\u03F1\u0313",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING DIAERESIS}\N{COMBINING GRAVE ACCENT} {"\u03C5\u0308\u0300","\u03A5\u0308\u0300","\u03C5\u0308\u0300",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING DIAERESIS}\N{COMBINING ACUTE ACCENT} {"\u03C5\u0308\u0301","\u03A5\u0308\u0301","\u03C5\u0308\u0301",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING DIAERESIS}\N{COMBINING GREEK PERISPOMENI} {"\u03C5\u0308\u0342","\u03A5\u0308\u0342","\u03C5\u0308\u0342",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING COMMA ABOVE} {"\u03C5\u0313","\u03A5\u0313","\u03C5\u0313",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING COMMA ABOVE}\N{COMBINING GRAVE ACCENT} {"\u03C5\u0313\u0300","\u03A5\u0313\u0300","\u03C5\u0313\u0300","\u1F50\u0300",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING COMMA ABOVE}\N{COMBINING ACUTE ACCENT} {"\u03C5\u0313\u0301","\u03A5\u0313\u0301","\u03C5\u0313\u0301","\u1F50\u0301",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING COMMA ABOVE}\N{COMBINING GREEK PERISPOMENI} {"\u03C5\u0313\u0342","\u03A5\u0313\u0342","\u03C5\u0313\u0342","\u1F50\u0342",}, // \N{GREEK SMALL LETTER UPSILON}\N{COMBINING GREEK PERISPOMENI} {"\u03C5\u0342","\u03A5\u0342","\u03C5\u0342",}, // \N{GREEK SMALL LETTER OMEGA}\N{COMBINING GREEK PERISPOMENI} {"\u03C9\u0342","\u03A9\u0342","\u03C9\u0342","\u2126\u0342",}, // \N{GREEK SMALL LETTER OMEGA}\N{COMBINING GREEK PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u03C9\u0342\u03B9","\u03A9\u0342\u0345","\u03A9\u0342\u0399","\u03A9\u0342\u03B9","\u03A9\u0342\u1FBE","\u03C9\u0342\u0345","\u03C9\u0342\u0399","\u03C9\u0342\u03B9","\u03C9\u0342\u1FBE","\u1FF6\u0345", "\u1FF6\u0399","\u1FF6\u03B9","\u1FF6\u1FBE","\u2126\u0342\u0345","\u2126\u0342\u0399","\u2126\u0342\u03B9","\u2126\u0342\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA}\N{GREEK SMALL LETTER IOTA} {"\u03C9\u03B9","\u03A9\u0345","\u03A9\u0399","\u03A9\u03B9","\u03A9\u1FBE","\u03C9\u0345","\u03C9\u0399","\u03C9\u03B9","\u03C9\u1FBE","\u2126\u0345","\u2126\u0399","\u2126\u03B9","\u2126\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH TONOS}\N{GREEK SMALL LETTER IOTA} {"\u03CE\u03B9","\u038F\u0345","\u038F\u0399","\u038F\u03B9","\u038F\u1FBE","\u03CE\u0345","\u03CE\u0399","\u03CE\u03B9","\u03CE\u1FBE",}, // \N{ARMENIAN SMALL LETTER ECH}\N{ARMENIAN SMALL LETTER YIWN} {"\u0565\u0582","\u0535\u0552","\u0535\u0582","\u0565\u0552","\u0565\u0582",}, // \N{ARMENIAN SMALL LETTER MEN}\N{ARMENIAN SMALL LETTER ECH} {"\u0574\u0565","\u0544\u0535","\u0544\u0565","\u0574\u0535","\u0574\u0565",}, // \N{ARMENIAN SMALL LETTER MEN}\N{ARMENIAN SMALL LETTER INI} {"\u0574\u056B","\u0544\u053B","\u0544\u056B","\u0574\u053B","\u0574\u056B",}, // \N{ARMENIAN SMALL LETTER MEN}\N{ARMENIAN SMALL LETTER XEH} {"\u0574\u056D","\u0544\u053D","\u0544\u056D","\u0574\u053D","\u0574\u056D",}, // \N{ARMENIAN SMALL LETTER MEN}\N{ARMENIAN SMALL LETTER NOW} {"\u0574\u0576","\u0544\u0546","\u0544\u0576","\u0574\u0546","\u0574\u0576",}, // \N{ARMENIAN SMALL LETTER VEW}\N{ARMENIAN SMALL LETTER NOW} {"\u057E\u0576","\u054E\u0546","\u054E\u0576","\u057E\u0546","\u057E\u0576",}, // \N{GREEK SMALL LETTER ALPHA WITH PSILI}\N{GREEK SMALL LETTER IOTA} {"\u1F00\u03B9","\u1F00\u0345","\u1F00\u0399","\u1F00\u03B9","\u1F00\u1FBE","\u1F08\u0345","\u1F08\u0399","\u1F08\u03B9","\u1F08\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH DASIA}\N{GREEK SMALL LETTER IOTA} {"\u1F01\u03B9","\u1F01\u0345","\u1F01\u0399","\u1F01\u03B9","\u1F01\u1FBE","\u1F09\u0345","\u1F09\u0399","\u1F09\u03B9","\u1F09\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH PSILI AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F02\u03B9","\u1F02\u0345","\u1F02\u0399","\u1F02\u03B9","\u1F02\u1FBE","\u1F0A\u0345","\u1F0A\u0399","\u1F0A\u03B9","\u1F0A\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH DASIA AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F03\u03B9","\u1F03\u0345","\u1F03\u0399","\u1F03\u03B9","\u1F03\u1FBE","\u1F0B\u0345","\u1F0B\u0399","\u1F0B\u03B9","\u1F0B\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH PSILI AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F04\u03B9","\u1F04\u0345","\u1F04\u0399","\u1F04\u03B9","\u1F04\u1FBE","\u1F0C\u0345","\u1F0C\u0399","\u1F0C\u03B9","\u1F0C\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH DASIA AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F05\u03B9","\u1F05\u0345","\u1F05\u0399","\u1F05\u03B9","\u1F05\u1FBE","\u1F0D\u0345","\u1F0D\u0399","\u1F0D\u03B9","\u1F0D\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH PSILI AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F06\u03B9","\u1F06\u0345","\u1F06\u0399","\u1F06\u03B9","\u1F06\u1FBE","\u1F0E\u0345","\u1F0E\u0399","\u1F0E\u03B9","\u1F0E\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH DASIA AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F07\u03B9","\u1F07\u0345","\u1F07\u0399","\u1F07\u03B9","\u1F07\u1FBE","\u1F0F\u0345","\u1F0F\u0399","\u1F0F\u03B9","\u1F0F\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH PSILI}\N{GREEK SMALL LETTER IOTA} {"\u1F20\u03B9","\u1F20\u0345","\u1F20\u0399","\u1F20\u03B9","\u1F20\u1FBE","\u1F28\u0345","\u1F28\u0399","\u1F28\u03B9","\u1F28\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH DASIA}\N{GREEK SMALL LETTER IOTA} {"\u1F21\u03B9","\u1F21\u0345","\u1F21\u0399","\u1F21\u03B9","\u1F21\u1FBE","\u1F29\u0345","\u1F29\u0399","\u1F29\u03B9","\u1F29\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH PSILI AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F22\u03B9","\u1F22\u0345","\u1F22\u0399","\u1F22\u03B9","\u1F22\u1FBE","\u1F2A\u0345","\u1F2A\u0399","\u1F2A\u03B9","\u1F2A\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH DASIA AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F23\u03B9","\u1F23\u0345","\u1F23\u0399","\u1F23\u03B9","\u1F23\u1FBE","\u1F2B\u0345","\u1F2B\u0399","\u1F2B\u03B9","\u1F2B\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH PSILI AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F24\u03B9","\u1F24\u0345","\u1F24\u0399","\u1F24\u03B9","\u1F24\u1FBE","\u1F2C\u0345","\u1F2C\u0399","\u1F2C\u03B9","\u1F2C\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH DASIA AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F25\u03B9","\u1F25\u0345","\u1F25\u0399","\u1F25\u03B9","\u1F25\u1FBE","\u1F2D\u0345","\u1F2D\u0399","\u1F2D\u03B9","\u1F2D\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH PSILI AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F26\u03B9","\u1F26\u0345","\u1F26\u0399","\u1F26\u03B9","\u1F26\u1FBE","\u1F2E\u0345","\u1F2E\u0399","\u1F2E\u03B9","\u1F2E\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH DASIA AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F27\u03B9","\u1F27\u0345","\u1F27\u0399","\u1F27\u03B9","\u1F27\u1FBE","\u1F2F\u0345","\u1F2F\u0399","\u1F2F\u03B9","\u1F2F\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH PSILI}\N{GREEK SMALL LETTER IOTA} {"\u1F60\u03B9","\u1F60\u0345","\u1F60\u0399","\u1F60\u03B9","\u1F60\u1FBE","\u1F68\u0345","\u1F68\u0399","\u1F68\u03B9","\u1F68\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH DASIA}\N{GREEK SMALL LETTER IOTA} {"\u1F61\u03B9","\u1F61\u0345","\u1F61\u0399","\u1F61\u03B9","\u1F61\u1FBE","\u1F69\u0345","\u1F69\u0399","\u1F69\u03B9","\u1F69\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH PSILI AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F62\u03B9","\u1F62\u0345","\u1F62\u0399","\u1F62\u03B9","\u1F62\u1FBE","\u1F6A\u0345","\u1F6A\u0399","\u1F6A\u03B9","\u1F6A\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH DASIA AND VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F63\u03B9","\u1F63\u0345","\u1F63\u0399","\u1F63\u03B9","\u1F63\u1FBE","\u1F6B\u0345","\u1F6B\u0399","\u1F6B\u03B9","\u1F6B\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH PSILI AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F64\u03B9","\u1F64\u0345","\u1F64\u0399","\u1F64\u03B9","\u1F64\u1FBE","\u1F6C\u0345","\u1F6C\u0399","\u1F6C\u03B9","\u1F6C\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH DASIA AND OXIA}\N{GREEK SMALL LETTER IOTA} {"\u1F65\u03B9","\u1F65\u0345","\u1F65\u0399","\u1F65\u03B9","\u1F65\u1FBE","\u1F6D\u0345","\u1F6D\u0399","\u1F6D\u03B9","\u1F6D\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH PSILI AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F66\u03B9","\u1F66\u0345","\u1F66\u0399","\u1F66\u03B9","\u1F66\u1FBE","\u1F6E\u0345","\u1F6E\u0399","\u1F6E\u03B9","\u1F6E\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI}\N{GREEK SMALL LETTER IOTA} {"\u1F67\u03B9","\u1F67\u0345","\u1F67\u0399","\u1F67\u03B9","\u1F67\u1FBE","\u1F6F\u0345","\u1F6F\u0399","\u1F6F\u03B9","\u1F6F\u1FBE",}, // \N{GREEK SMALL LETTER ALPHA WITH VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F70\u03B9","\u1F70\u0345","\u1F70\u0399","\u1F70\u03B9","\u1F70\u1FBE","\u1FBA\u0345","\u1FBA\u0399","\u1FBA\u03B9","\u1FBA\u1FBE",}, // \N{GREEK SMALL LETTER ETA WITH VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F74\u03B9","\u1F74\u0345","\u1F74\u0399","\u1F74\u03B9","\u1F74\u1FBE","\u1FCA\u0345","\u1FCA\u0399","\u1FCA\u03B9","\u1FCA\u1FBE",}, // \N{GREEK SMALL LETTER OMEGA WITH VARIA}\N{GREEK SMALL LETTER IOTA} {"\u1F7C\u03B9","\u1F7C\u0345","\u1F7C\u0399","\u1F7C\u03B9","\u1F7C\u1FBE","\u1FFA\u0345","\u1FFA\u0399","\u1FFA\u03B9","\u1FFA\u1FBE",}, }; // this initializes the data used to generated the case-equivalents static { // Gather up the exceptions in a form we can use if (!GENERATE) { for (int i = 0; i < exceptionList.length; ++i) { String[] exception = exceptionList[i]; Set s = new HashSet(); // there has to be some method to do the following, but I can't find it in the collections for (int j = 0; j < exception.length; ++j) { s.add(exception[j]); } fromCaseFold.put(exception[0], s); } } // walk through all the characters, and at every case fold result, // put a set of all the characters that map to that result boolean defaultmapping = true; // false for turkish for (int i = 0; i <= 0x10FFFF; ++i) { int cat = UCharacter.getType(i); if (cat == Character.UNASSIGNED || cat == Character.PRIVATE_USE) continue; String cp = UTF16.valueOf(i); String mapped = UCharacter.foldCase(cp, defaultmapping); if (mapped.equals(cp)) continue; if (maxLength < mapped.length()) maxLength = mapped.length(); // at this point, have different case folding Set s = (Set) fromCaseFold.get(mapped); if (s == null) { s = new HashSet(); s.add(mapped); // add the case fold result itself fromCaseFold.put(mapped, s); } s.add(cp); toCaseFold.put(cp, mapped); toCaseFold.put(mapped, mapped); // add mapping to self } // Emit the final data if (DUMP) { System.out.println("maxLength = " + maxLength); System.out.println("\nfromCaseFold:"); Iterator it = fromCaseFold.keySet().iterator(); while (it.hasNext()) { Object key = it.next(); System.out.print(" " + toHex2.transliterate((String)key) + ": "); Set s = (Set) fromCaseFold.get(key); Iterator it2 = s.iterator(); boolean first = true; while (it2.hasNext()) { if (first) { first = false; } else { System.out.print(", "); } System.out.print(toHex2.transliterate((String)it2.next())); } System.out.println(""); } System.out.println("\ntoCaseFold:"); it = toCaseFold.keySet().iterator(); while (it.hasNext()) { String key = (String) it.next(); String value = (String) toCaseFold.get(key); System.out.println(" " + toHex2.transliterate(key) + ": " + toHex2.transliterate(value)); } } // Now convert all those sets into linear arrays // We can't do this in place in Java, so make a temporary target array // Note: This could be transformed into a single array, with offsets into it. // Might be best choice in C. Map fromCaseFold2 = new HashMap(); Iterator it = fromCaseFold.keySet().iterator(); while (it.hasNext()) { Object key = it.next(); Set s = (Set) fromCaseFold.get(key); String[] temp = new String[s.size()]; s.toArray(temp); fromCaseFold2.put(key, temp); } fromCaseFold = fromCaseFold2; // We have processed everything, so the iterator will now work // The following is normally OFF. // It is here to generate (under the GENERATE flag) the static exception list. // It must be at the very end of initialization, so that the iterator is functional. // (easiest to do it that way) if (GENERATE) { // first get small set of items that have multiple characters Set multichars = new TreeSet(); it = fromCaseFold.keySet().iterator(); while (it.hasNext()) { String key = (String) it.next(); if (UTF16.countCodePoint(key) < 2) continue; multichars.add(key); } // now we will go through each of them. CaseIterator ci = new CaseIterator(); it = multichars.iterator(); while (it.hasNext()) { String key = (String) it.next(); // here is a nasty complication. Take 'ffi' ligature. We // can't just close it, since we would miss the combination // that includes the 'fi' => "fi" ligature // so first do a pass through, and add substring combinations // we call this a 'partial closure' Set partialClosure = new TreeSet(); partialClosure.add(key); if (UTF16.countCodePoint(key) > 2) { Iterator multiIt2 = multichars.iterator(); while (multiIt2.hasNext()) { String otherKey = (String) multiIt2.next(); if (otherKey.length() >= key.length()) continue; int pos = -1; while (true) { // The following is not completely general // but works for the actual cased stuff, // and should work for future characters, since we won't have // more ligatures & other oddities. pos = key.indexOf(otherKey, pos+1); if (pos < 0) break; int endPos = pos + otherKey.length(); // we know we have a proper substring, // so get the combinations String[] choices = (String[]) fromCaseFold.get(otherKey); for (int ii = 0; ii < choices.length; ++ii) { String patchwork = key.substring(0, pos) + choices[ii] + key.substring(endPos); partialClosure.add(patchwork); } } } } // now, for each thing in the partial closure, get its // case closure and add it to the final result. Set closure = new TreeSet(); // this will be the real closure Iterator partialIt = partialClosure.iterator(); while (partialIt.hasNext()) { String key2 = (String) partialIt.next(); ci.reset(key2); for (String temp = ci.next(); temp != null; temp = ci.next()) { closure.add(temp); } // form closure /*String[] choices = (String[]) fromCaseFold.get(key2); for (int i = 0; i < choices.length; ++i) { ci.reset(choices[i]); String temp; while (null != (temp = ci.next())) { closure.add(temp); } } */ } // print it out, so that it can be cut and pasted back into this document. Iterator it2 = closure.iterator(); System.out.println("\t// " + toName.transliterate(key)); System.out.print("\t{\"" + toHex.transliterate(key) + "\","); while (it2.hasNext()) { String item = (String)it2.next(); System.out.print("\"" + toHex.transliterate(item) + "\","); } System.out.println("},"); } } } // ============ PRIVATE CLASS DATA ============ // pieces that we will put together // is not changed during iteration private int count = 0; private String[][] variants; // state information, changes during iteration private boolean done = false; private int[] counts; // internal buffer for efficiency private StringBuffer nextBuffer = new StringBuffer(); // ======================== /** * Reset to different source. Once reset, the iteration starts from the beginning. * @param source The string to get case variants for */ public void reset(String source) { // allocate arrays to store pieces // using length might be slightly too long, but we don't care much counts = new int[source.length()]; variants = new String[source.length()][]; // walk through the source, and break up into pieces // each piece becomes an array of equivalent values // TODO: could optimized this later to coalesce all single string pieces String piece = null; count = 0; for (int i = 0; i < source.length(); i += piece.length()) { // find *longest* matching piece String caseFold = null; if (GENERATE) { // do exactly one CP piece = UTF16.valueOf(source, i); caseFold = (String) toCaseFold.get(piece); } else { int max = i + maxLength; if (max > source.length()) max = source.length(); for (int j = max; j > i; --j) { piece = source.substring(i, j); caseFold = (String) toCaseFold.get(piece); if (caseFold != null) break; } } // if we fail, pick one code point if (caseFold == null) { piece = UTF16.valueOf(source, i); variants[count++] = new String[] {piece}; // single item string } else { variants[count++] = (String[])fromCaseFold.get(caseFold); } } reset(); } /** * Restart the iteration from the beginning, but with same source */ public void reset() { done = false; for (int i = 0; i < count; ++i) { counts[i] = 0; } } /** * Iterates through the case variants. * @return next case variant. Each variant will case-fold to the same value as the source will. * When the iteration is done, null is returned. */ public String next() { if (done) return null; int i; // TODO Optimize so we keep the piece before and after the current position // so we don't have so much concatenation // get the result, a concatenation nextBuffer.setLength(0); for (i = 0; i < count; ++i) { nextBuffer.append(variants[i][counts[i]]); } // find the next right set of pieces to concatenate for (i = count-1; i >= 0; --i) { counts[i]++; if (counts[i] < variants[i].length) break; counts[i] = 0; } // if we go too far, bail if (i < 0) { done = true; } return nextBuffer.toString(); } /** * Temporary test, just to see how the stuff works. */ static public void main(String[] args) { String[] testCases = {"fiss", "h\u03a3"}; CaseIterator ci = new CaseIterator(); for (int i = 0; i < testCases.length; ++i) { String item = testCases[i]; System.out.println(); System.out.println("Testing: " + toName.transliterate(item)); System.out.println(); ci.reset(item); int count = 0; for (String temp = ci.next(); temp != null; temp = ci.next()) { System.out.println(toName.transliterate(temp)); count++; } System.out.println("Total: " + count); } // generate a list of all caseless characters -- characters whose // case closure is themselves. UnicodeSet caseless = new UnicodeSet(); for (int i = 0; i <= 0x10FFFF; ++i) { String cp = UTF16.valueOf(i); ci.reset(cp); int count = 0; String fold = null; for (String temp = ci.next(); temp != null; temp = ci.next()) { fold = temp; if (++count > 1) break; } if (count==1 && fold.equals(cp)) { caseless.add(i); } } System.out.println("caseless = " + caseless.toPattern(true)); UnicodeSet not_lc = new UnicodeSet("[:^lc:]"); UnicodeSet a = new UnicodeSet(); a.set(not_lc); a.removeAll(caseless); System.out.println("[:^lc:] - caseless = " + a.toPattern(true)); a.set(caseless); a.removeAll(not_lc); System.out.println("caseless - [:^lc:] = " + a.toPattern(true)); } }