Examples of com.ibm.icu.text.DateTimePatternGenerator$PatternWithMatcher

com.ibm.icu.text.DateTimePatternGenerator
This class provides mechanisms for parsing a SimpleDateFormat pattern or generating a new pattern, while handling the quoting. It represents the result of the parse as a list of items, where each item is either a literal string or a variable field. When parsing It can be used to find out which variable fields are in a date format, and in what order, such as for presentation in a UI as separate text entry fields. It can also be used to construct new SimpleDateFormats.
Example:
```
 public boolean containsZone(String pattern) { for (Iterator it = formatParser.set(pattern).getItems().iterator(); it.hasNext();) { Object item = it.next(); if (item instanceof VariableField) { VariableField variableField = (VariableField) item; if (variableField.getType() == DateTimePatternGenerator.ZONE) { return true; } } } return false; } 
```
@internal @deprecated This API is ICU internal only.

        // some simple use cases
        ULocale locale = ULocale.GERMANY;
        TimeZone zone = TimeZone.getTimeZone("Europe/Paris");
        
        // make from locale
        DateTimePatternGenerator gen = DateTimePatternGenerator.getInstance(locale);
        SimpleDateFormat format = new SimpleDateFormat(gen.getBestPattern("MMMddHmm"), locale);
        format.setTimeZone(zone);
        assertEquals("simple format: MMMddHmm", "14. Okt 8:58", format.format(sampleDate));
        // (a generator can be built from scratch, but that is not a typical use case)


        // modify the generator by adding patterns
        DateTimePatternGenerator.PatternInfo returnInfo = new DateTimePatternGenerator.PatternInfo();
        gen.addPattern("d'. von' MMMM", true, returnInfo); 
        // the returnInfo is mostly useful for debugging problem cases
        format.applyPattern(gen.getBestPattern("MMMMddHmm"));
        assertEquals("modified format: MMMddHmm", "14. von Oktober 8:58", format.format(sampleDate));


        // get a pattern and modify it
        format = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL, locale);
        format.setTimeZone(zone);
        String pattern = format.toPattern();
        assertEquals("full-date", "Donnerstag, 14. Oktober 1999 08:58:59 Mitteleurop\u00E4ische Sommerzeit", format.format(sampleDate));


        // modify it to change the zone.
        String newPattern = gen.replaceFieldTypes(pattern, "vvvv");
        format.applyPattern(newPattern);
        assertEquals("full-date: modified zone", "Donnerstag, 14. Oktober 1999 08:58:59 Frankreich", format.format(sampleDate));
        
        // add test of basic cases


        //lang  YYYYMMM MMMd    MMMdhmm hmm hhmm    Full Date-Time
        // en  Mar 2007    Mar 4   6:05 PM Mar 4   6:05 PM 06:05 PM    Sunday, March 4, 2007 6:05:05 PM PT
        DateTimePatternGenerator enGen = DateTimePatternGenerator.getInstance(ULocale.ENGLISH);
        TimeZone enZone = TimeZone.getTimeZone("Etc/GMT");
        SimpleDateFormat enFormat = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL, ULocale.ENGLISH);
        enFormat.setTimeZone(enZone);
        String[][] tests = {
              {"yyyyMMMdd", "Oct 14, 1999"},
              {"yyyyqqqq", "4th quarter 1999"},
              {"yMMMdd", "Oct 14, 1999"},
              {"EyyyyMMMdd", "Thu, Oct 14, 1999"},
              {"yyyyMMdd", "10/14/1999"},
              {"yyyyMMM", "Oct 1999"},
              {"yyyyMM", "10/1999"},
              {"yyMM", "10/99"},
              {"yMMMMMd", "O 14, 1999"},  // narrow format
              {"EEEEEMMMMMd", "T, O 14"},  // narrow format
              {"MMMd", "Oct 14"},
              {"MMMdhmm", "Oct 14 6:58 AM"},
              {"EMMMdhmms", "Thu, Oct 14 6:58:59 AM"},
              {"MMdhmm", "10/14 6:58 AM"},
              {"EEEEMMMdhmms", "Thursday, Oct 14 6:58:59 AM"},
              {"yyyyMMMddhhmmss", "Oct 14, 1999 06:58:59 AM"},
              {"EyyyyMMMddhhmmss", "Thu, Oct 14, 1999 06:58:59 AM"},
              {"hmm", "6:58 AM"},
              {"hhmm", "06:58 AM"},
              {"hhmmVVVV", "06:58 AM GMT+00:00"},
        };
        for (int i = 0; i < tests.length; ++i) {
            final String testSkeleton = tests[i][0];
            String pat = enGen.getBestPattern(testSkeleton);
            enFormat.applyPattern(pat);
            String formattedDate = enFormat.format(sampleDate);
            assertEquals("Testing skeleton '" + testSkeleton + "' with  " + sampleDate, tests[i][1], formattedDate);
        }
    }

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            assertEquals("Testing skeleton '" + testSkeleton + "' with  " + sampleDate, tests[i][1], formattedDate);
        }
    }


    public void TestRoot() {
        DateTimePatternGenerator rootGen = DateTimePatternGenerator.getInstance(ULocale.ROOT);
        SimpleDateFormat rootFormat = new SimpleDateFormat(rootGen.getBestPattern("yMdHms"), ULocale.ROOT);
        rootFormat.setTimeZone(gmt);
        assertEquals("root format: yMdHms", "1999-10-14 6:58:59", rootFormat.format(sampleDate));
    }

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        assertEquals("root format: yMdHms", "1999-10-14 6:58:59", rootFormat.format(sampleDate));
    }
    
    public void TestEmpty() {
        // now nothing
        DateTimePatternGenerator nullGen = DateTimePatternGenerator.getEmptyInstance();
        SimpleDateFormat format = new SimpleDateFormat(nullGen.getBestPattern("yMdHms"), ULocale.ROOT);
        TimeZone rootZone = TimeZone.getTimeZone("Etc/GMT");
        format.setTimeZone(rootZone);
    }

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    static final String[] statusName = {"DONE", "SYNTAX", "LITERAL", "BROKEN_QUOTE", "BROKEN_ESCAPE", "UNKNOWN"};
    
    public void TestBasic() {
        ULocale uLocale = null;
        DateTimePatternGenerator dtfg = null;
        Date date = null;
        for (int i = 0; i < dateTestData.length; ++i) {
            if (dateTestData[i] instanceof ULocale) {
                uLocale = (ULocale) dateTestData[i];
                dtfg = DateTimePatternGenerator.getInstance(uLocale);
                if (GENERATE_TEST_DATA) logln("new ULocale(\"" + uLocale.toString() + "\"),");
            } else if (dateTestData[i] instanceof Date) {
                date = (Date) dateTestData[i];
                if (GENERATE_TEST_DATA) logln("new Date(" + date.getTime()+ "L),");
            } else if (dateTestData[i] instanceof String) {
                String testSkeleton = (String) dateTestData[i];
                String pattern = dtfg.getBestPattern(testSkeleton);
                SimpleDateFormat sdf = new SimpleDateFormat(pattern, uLocale);
                String formatted = sdf.format(date);
                if (GENERATE_TEST_DATA) logln("new String[] {\"" + testSkeleton + "\", \"" + Utility.escape(formatted) + "\"},");
                //logln(uLocale + "\t" + testSkeleton + "\t" + pattern + "\t" + sdf.format(date));
            } else {
                String[] testPair = (String[]) dateTestData[i];
                String testSkeleton = testPair[0];
                String testFormatted = testPair[1];
                String pattern = dtfg.getBestPattern(testSkeleton);
                SimpleDateFormat sdf = new SimpleDateFormat(pattern, uLocale);
                String formatted = sdf.format(date);
                if (GENERATE_TEST_DATA) {
                    logln("new String[] {\"" + testSkeleton + "\", \"" + Utility.escape(formatted) + "\"},");
                } else if (!formatted.equals(testFormatted)) {
                    errln(uLocale + "\tformatted string doesn't match test case: " + testSkeleton + "\t generated: " +  pattern + "\t expected: " + testFormatted + "\t got: " + formatted);
                    if (true) { // debug
                        pattern = dtfg.getBestPattern(testSkeleton);
                        sdf = new SimpleDateFormat(pattern, uLocale);
                        formatted = sdf.format(date);
                    }
                }
                //logln(uLocale + "\t" + testSkeleton + "\t" + pattern + "\t" + sdf.format(date));

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    public void DayMonthTest() {
        final ULocale locale = ULocale.FRANCE;
        
        // set up the generator
        DateTimePatternGenerator dtpgen
          = DateTimePatternGenerator.getInstance(locale);
        
        // get a pattern for an abbreviated month and day
        final String pattern = dtpgen.getBestPattern("MMMd");
        SimpleDateFormat formatter = new SimpleDateFormat(pattern, locale);
        
        // use it to format (or parse)
        String formatted = formatter.format(new Date());
        logln("formatted=" + formatted);

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            //ticket#6503
            if(params.inclusion<=5 && count%3!=0){
                continue;
            }
            logln(locales[i].toString());
            DateTimePatternGenerator dtpgen
            = DateTimePatternGenerator.getInstance(locales[i]);
            
            for (int style1 = DateFormat.FULL; style1 <= DateFormat.SHORT; ++style1) {
                final SimpleDateFormat oldFormat = (SimpleDateFormat) DateFormat.getTimeInstance(style1, locales[i]);
                String pattern = oldFormat.toPattern();
                String newPattern = dtpgen.replaceFieldTypes(pattern, "VVVV"); // replaceZoneString(pattern, "VVVV");
                if (newPattern.equals(pattern)) {
                    continue;
                }
                // verify that it roundtrips parsing
                SimpleDateFormat newFormat = new SimpleDateFormat(newPattern, locales[i]);

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  private static class DtfiGenerator {


    private static void buildPatterns(GwtLocale locale, TreeMap<Key, String[]> properties) {
      ULocale ulocale = new ULocale(ULocale.canonicalize(locale.getAsString()));
      DateTimePatternGenerator dtpg = DateTimePatternGenerator.getInstance(ulocale);
      for (Map.Entry<String, String> entry : patterns.entrySet()) {
        properties.put(new Key(locale, "format" + entry.getKey()), new String[] {dtpg
            .getBestPattern(entry.getValue())});
      }
    }

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