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Starts implementing SimpleDateFormat

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konsoletyper 2014-06-19 17:43:44 +04:00
parent f71f847411
commit 5fd0c47970
1 changed files with 160 additions and 0 deletions
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160
teavm-classlib/src/main/java/org/teavm/classlib/java/text/DateFormatElement.java Normal file
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/*
* Copyright 2014 Alexey Andreev.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.teavm.classlib.java.text;
import org.teavm.classlib.java.util.TCalendar;
/**
*
* @author Alexey Andreev
*/
abstract class DateFormatElement {
public abstract void format(TCalendar date, StringBuffer buffer);
public abstract void parse(String text, TCalendar date, TParsePosition position);
static boolean matches(String text, int position, String pattern) {
if (pattern.length() + position > text.length()) {
return false;
}
for (int i = 0; i < pattern.length(); ++i) {
if (Character.toLowerCase(pattern.charAt(i)) != Character.toLowerCase(text.charAt(position++))) {
return false;
}
}
return true;
}
static int whichMatches(String text, TParsePosition position, String[] patterns) {
for (int i = 0; i < patterns.length; ++i) {
if (matches(text, position.getIndex(), patterns[i])) {
position.setIndex(position.getIndex() + patterns[i].length());
return i;
}
}
return -1;
}
public static class MonthText extends DateFormatElement {
String[] months;
String[] shortMonths;
boolean abbreviated;
public MonthText(TDateFormatSymbols symbols, boolean abbreviated) {
months = symbols.getMonths();
shortMonths = symbols.getShortMonths();
this.abbreviated = abbreviated;
}
@Override
public void format(TCalendar date, StringBuffer buffer) {
int month = date.get(TCalendar.MONTH);
buffer.append(abbreviated ? shortMonths[month] : months[month]);
}
@Override
public void parse(String text, TCalendar date, TParsePosition position) {
int month = whichMatches(text, position, months);
if (month < 0) {
month = whichMatches(text, position, shortMonths);
}
if (month < 0) {
position.setErrorIndex(position.getIndex());
} else {
date.set(TCalendar.MONTH, month);
}
}
}
public static class WeekdayText extends DateFormatElement {
String[] weeks;
String[] shortWeeks;
boolean abbreviated;
public WeekdayText(TDateFormatSymbols symbols, boolean abbreviated) {
weeks = symbols.getWeekdays();
shortWeeks = symbols.getShortWeekdays();
this.abbreviated = abbreviated;
}
@Override
public void format(TCalendar date, StringBuffer buffer) {
int weekday = date.get(TCalendar.DAY_OF_WEEK);
buffer.append(abbreviated ? shortWeeks[weekday] : weeks[weekday]);
}
@Override
public void parse(String text, TCalendar date, TParsePosition position) {
int weekday = whichMatches(text, position, weeks);
if (weekday < 0) {
weekday = whichMatches(text, position, shortWeeks);
}
if (weekday < 0) {
position.setErrorIndex(position.getIndex());
} else {
date.set(TCalendar.WEEK_OF_MONTH, weekday + 1);
}
}
}
public static class EraText extends DateFormatElement {
String[] eras;
public EraText(TDateFormatSymbols symbols) {
eras = symbols.getEras();
}
@Override
public void format(TCalendar date, StringBuffer buffer) {
int era = date.get(TCalendar.ERA);
buffer.append(eras[era]);
}
@Override
public void parse(String text, TCalendar date, TParsePosition position) {
int era = whichMatches(text, position, eras);
if (era < 0) {
position.setErrorIndex(position.getIndex());
} else {
date.set(TCalendar.ERA, era);
}
}
}
public static class AmPmText extends DateFormatElement {
String[] ampms;
public AmPmText(TDateFormatSymbols symbols) {
ampms = symbols.getAmPmStrings();
}
@Override
public void format(TCalendar date, StringBuffer buffer) {
int ampm = date.get(TCalendar.AM_PM);
buffer.append(ampms[ampm]);
}
@Override
public void parse(String text, TCalendar date, TParsePosition position) {
int ampm = whichMatches(text, position, ampms);
if (ampm < 0) {
position.setErrorIndex(position.getIndex());
} else {
date.set(TCalendar.AM_PM, ampm);
}
}
}
}