327 lines
13 KiB
Java
327 lines
13 KiB
Java
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/* GENERATED SOURCE. DO NOT MODIFY. */
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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2014-2016, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*/
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package android.icu.text;
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import java.text.AttributedCharacterIterator;
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import java.text.AttributedCharacterIterator.Attribute;
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import java.text.CharacterIterator;
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import java.util.Map;
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import android.icu.impl.StaticUnicodeSets;
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import android.icu.lang.UCharacter;
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import android.icu.util.ULocale;
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/**
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*A formatter that formats numbers in user-friendly scientific notation.
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*
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* ScientificNumberFormatter instances are immutable and thread-safe.
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*
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* Sample code:
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* <pre>
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* ULocale en = new ULocale("en");
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* ScientificNumberFormatter fmt = ScientificNumberFormatter.getMarkupInstance(
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* en, "<sup>", "</sup>");
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* </pre>
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* <pre>
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* // Output: "1.23456×10<sup>-78</sup>"
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* System.out.println(fmt.format(1.23456e-78));
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* </pre>
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*
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*/
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public final class ScientificNumberFormatter {
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private final String preExponent;
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private final DecimalFormat fmt;
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private final Style style;
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/**
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* Gets a ScientificNumberFormatter instance that uses
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* superscript characters for exponents for this locale.
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* @param locale The locale
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* @return The ScientificNumberFormatter instance.
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*/
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public static ScientificNumberFormatter getSuperscriptInstance(ULocale locale) {
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return getInstanceForLocale(locale, SUPER_SCRIPT);
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}
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/**
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* Gets a ScientificNumberFormatter instance that uses
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* superscript characters for exponents.
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* @param df The DecimalFormat must be configured for scientific
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* notation. Caller may safely change df after this call as this method
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* clones it when creating the ScientificNumberFormatter.
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* @return the ScientificNumberFormatter instance.
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*/
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public static ScientificNumberFormatter getSuperscriptInstance(
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DecimalFormat df) {
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return getInstance(df, SUPER_SCRIPT);
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}
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/**
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* Gets a ScientificNumberFormatter instance that uses
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* markup for exponents for this locale.
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* @param locale The locale
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* @param beginMarkup the markup to start superscript e.g {@code <sup>}
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* @param endMarkup the markup to end superscript e.g {@code </sup>}
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* @return The ScientificNumberFormatter instance.
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*/
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public static ScientificNumberFormatter getMarkupInstance(
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ULocale locale,
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String beginMarkup,
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String endMarkup) {
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return getInstanceForLocale(
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locale, new MarkupStyle(beginMarkup, endMarkup));
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}
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/**
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* Gets a ScientificNumberFormatter instance that uses
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* markup for exponents.
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* @param df The DecimalFormat must be configured for scientific
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* notation. Caller may safely change df after this call as this method
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* clones it when creating the ScientificNumberFormatter.
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* @param beginMarkup the markup to start superscript e.g {@code <sup>}
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* @param endMarkup the markup to end superscript e.g {@code </sup>}
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* @return The ScientificNumberFormatter instance.
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*/
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public static ScientificNumberFormatter getMarkupInstance(
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DecimalFormat df,
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String beginMarkup,
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String endMarkup) {
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return getInstance(
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df, new MarkupStyle(beginMarkup, endMarkup));
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}
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/**
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* Formats a number
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* @param number Can be a double, int, Number or
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* anything that DecimalFormat#format(Object) accepts.
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* @return the formatted string.
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*/
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public String format(Object number) {
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synchronized (fmt) {
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return style.format(
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fmt.formatToCharacterIterator(number),
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preExponent);
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}
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}
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/**
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* A style type for ScientificNumberFormatter. All Style instances are immutable
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* and thread-safe.
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*/
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private static abstract class Style {
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abstract String format(
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AttributedCharacterIterator iterator,
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String preExponent); // '* 10^'
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static void append(
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AttributedCharacterIterator iterator,
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int start,
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int limit,
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StringBuilder result) {
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int oldIndex = iterator.getIndex();
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iterator.setIndex(start);
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for (int i = start; i < limit; i++) {
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result.append(iterator.current());
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iterator.next();
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}
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iterator.setIndex(oldIndex);
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}
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}
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private static class MarkupStyle extends Style {
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private final String beginMarkup;
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private final String endMarkup;
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MarkupStyle(String beginMarkup, String endMarkup) {
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this.beginMarkup = beginMarkup;
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this.endMarkup = endMarkup;
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}
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@Override
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String format(
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AttributedCharacterIterator iterator,
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String preExponent) {
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int copyFromOffset = 0;
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StringBuilder result = new StringBuilder();
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for (
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iterator.first();
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iterator.current() != CharacterIterator.DONE;
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) {
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Map<Attribute, Object> attributeSet = iterator.getAttributes();
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if (attributeSet.containsKey(NumberFormat.Field.EXPONENT_SYMBOL)) {
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append(
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iterator,
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copyFromOffset,
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iterator.getRunStart(NumberFormat.Field.EXPONENT_SYMBOL),
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result);
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copyFromOffset = iterator.getRunLimit(NumberFormat.Field.EXPONENT_SYMBOL);
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iterator.setIndex(copyFromOffset);
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result.append(preExponent);
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result.append(beginMarkup);
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} else if (attributeSet.containsKey(NumberFormat.Field.EXPONENT)) {
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int limit = iterator.getRunLimit(NumberFormat.Field.EXPONENT);
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append(
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iterator,
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copyFromOffset,
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limit,
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result);
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copyFromOffset = limit;
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iterator.setIndex(copyFromOffset);
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result.append(endMarkup);
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} else {
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iterator.next();
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}
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}
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append(iterator, copyFromOffset, iterator.getEndIndex(), result);
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return result.toString();
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}
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}
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private static class SuperscriptStyle extends Style {
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private static final char[] SUPERSCRIPT_DIGITS = {
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0x2070, 0xB9, 0xB2, 0xB3, 0x2074, 0x2075, 0x2076, 0x2077, 0x2078, 0x2079
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};
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private static final char SUPERSCRIPT_PLUS_SIGN = 0x207A;
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private static final char SUPERSCRIPT_MINUS_SIGN = 0x207B;
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@Override
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String format(
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AttributedCharacterIterator iterator,
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String preExponent) {
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int copyFromOffset = 0;
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StringBuilder result = new StringBuilder();
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for (
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iterator.first();
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iterator.current() != CharacterIterator.DONE;
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) {
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Map<Attribute, Object> attributeSet = iterator.getAttributes();
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if (attributeSet.containsKey(NumberFormat.Field.EXPONENT_SYMBOL)) {
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append(
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iterator,
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copyFromOffset,
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iterator.getRunStart(NumberFormat.Field.EXPONENT_SYMBOL),
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result);
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copyFromOffset = iterator.getRunLimit(NumberFormat.Field.EXPONENT_SYMBOL);
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iterator.setIndex(copyFromOffset);
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result.append(preExponent);
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} else if (attributeSet.containsKey(NumberFormat.Field.EXPONENT_SIGN)) {
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int start = iterator.getRunStart(NumberFormat.Field.EXPONENT_SIGN);
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int limit = iterator.getRunLimit(NumberFormat.Field.EXPONENT_SIGN);
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int aChar = char32AtAndAdvance(iterator);
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if (StaticUnicodeSets.get(StaticUnicodeSets.Key.MINUS_SIGN).contains(aChar)) {
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append(
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iterator,
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copyFromOffset,
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start,
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result);
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result.append(SUPERSCRIPT_MINUS_SIGN);
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} else if (StaticUnicodeSets.get(StaticUnicodeSets.Key.PLUS_SIGN).contains(aChar)) {
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append(
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iterator,
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copyFromOffset,
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start,
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result);
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result.append(SUPERSCRIPT_PLUS_SIGN);
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} else {
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throw new IllegalArgumentException();
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}
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copyFromOffset = limit;
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iterator.setIndex(copyFromOffset);
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} else if (attributeSet.containsKey(NumberFormat.Field.EXPONENT)) {
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int start = iterator.getRunStart(NumberFormat.Field.EXPONENT);
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int limit = iterator.getRunLimit(NumberFormat.Field.EXPONENT);
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append(
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iterator,
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copyFromOffset,
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start,
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result);
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copyAsSuperscript(iterator, start, limit, result);
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copyFromOffset = limit;
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iterator.setIndex(copyFromOffset);
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} else {
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iterator.next();
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}
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}
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append(iterator, copyFromOffset, iterator.getEndIndex(), result);
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return result.toString();
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}
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private static void copyAsSuperscript(
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AttributedCharacterIterator iterator, int start, int limit, StringBuilder result) {
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int oldIndex = iterator.getIndex();
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iterator.setIndex(start);
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while (iterator.getIndex() < limit) {
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int aChar = char32AtAndAdvance(iterator);
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int digit = UCharacter.digit(aChar);
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if (digit < 0) {
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throw new IllegalArgumentException();
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}
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result.append(SUPERSCRIPT_DIGITS[digit]);
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}
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iterator.setIndex(oldIndex);
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}
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private static int char32AtAndAdvance(AttributedCharacterIterator iterator) {
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char c1 = iterator.current();
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char c2 = iterator.next();
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if (UCharacter.isHighSurrogate(c1)) {
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// If c2 is DONE, it will fail the low surrogate test and we
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// skip this block.
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if (UCharacter.isLowSurrogate(c2)) {
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iterator.next();
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return UCharacter.toCodePoint(c1, c2);
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}
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}
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return c1;
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}
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}
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private static String getPreExponent(DecimalFormatSymbols dfs) {
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StringBuilder preExponent = new StringBuilder();
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preExponent.append(dfs.getExponentMultiplicationSign());
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char[] digits = dfs.getDigits();
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preExponent.append(digits[1]).append(digits[0]);
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return preExponent.toString();
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}
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private static ScientificNumberFormatter getInstance(
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DecimalFormat decimalFormat, Style style) {
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DecimalFormatSymbols dfs = decimalFormat.getDecimalFormatSymbols();
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return new ScientificNumberFormatter(
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(DecimalFormat) decimalFormat.clone(), getPreExponent(dfs), style);
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}
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private static ScientificNumberFormatter getInstanceForLocale(
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ULocale locale, Style style) {
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DecimalFormat decimalFormat =
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(DecimalFormat) DecimalFormat.getScientificInstance(locale);
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return new ScientificNumberFormatter(
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decimalFormat,
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getPreExponent(decimalFormat.getDecimalFormatSymbols()),
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style);
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}
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private static final Style SUPER_SCRIPT = new SuperscriptStyle();
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private ScientificNumberFormatter(
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DecimalFormat decimalFormat, String preExponent, Style style) {
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this.fmt = decimalFormat;
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this.preExponent = preExponent;
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this.style = style;
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}
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}
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