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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
package com.ibm.icu.impl;
import java.util.EnumMap;
import java.util.Map;
import com.ibm.icu.impl.UResource.Value;
import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* This class statically initializes UnicodeSets, originally built for number parsing. Microbenchmarks
* show this to bring a very sizeable performance boost.
*
* IMPORTANT ASSUMPTION FOR NUMBER PARSING: All of the sets contain code points (no strings) and they are
* all case-folded. If this assumption were ever broken, logic in classes such as SymbolMatcher would
* need to be updated in order to return well-formed sets upon calls to getLeadCodePoints().
*
* @author sffc
*/
public class StaticUnicodeSets {
public static enum Key {
EMPTY,
// Ignorables
DEFAULT_IGNORABLES,
STRICT_IGNORABLES,
// Separators
// Notes:
// - COMMA is a superset of STRICT_COMMA
// - PERIOD is a superset of SCRICT_PERIOD
// - ALL_SEPARATORS is the union of COMMA, PERIOD, and OTHER_GROUPING_SEPARATORS
// - STRICT_ALL_SEPARATORS is the union of STRICT_COMMA, STRICT_PERIOD, and OTHER_GRP_SEPARATORS
COMMA,
PERIOD,
STRICT_COMMA,
STRICT_PERIOD,
APOSTROPHE_SIGN,
OTHER_GROUPING_SEPARATORS,
ALL_SEPARATORS,
STRICT_ALL_SEPARATORS,
// Symbols
// TODO: NaN?
MINUS_SIGN,
PLUS_SIGN,
PERCENT_SIGN,
PERMILLE_SIGN,
INFINITY_SIGN,
// Currency Symbols
DOLLAR_SIGN,
POUND_SIGN,
RUPEE_SIGN,
YEN_SIGN,
WON_SIGN,
// Other
DIGITS,
// Combined Separators with Digits (for lead code points)
DIGITS_OR_ALL_SEPARATORS,
DIGITS_OR_STRICT_ALL_SEPARATORS,
};
private static final Map unicodeSets = new EnumMap<>(Key.class);
/**
* Gets the static-allocated UnicodeSet according to the provided key.
*
* @param key
* The desired UnicodeSet according to the enum in this file.
* @return The requested UnicodeSet. Guaranteed to be frozen and non-null, but may be empty if an
* error occurred during data loading.
*/
public static UnicodeSet get(Key key) {
UnicodeSet candidate = unicodeSets.get(key);
if (candidate == null) {
return UnicodeSet.EMPTY;
}
return candidate;
}
/**
* Checks if the UnicodeSet given by key1 contains the given string.
*
* @param str
* The string to check.
* @param key1
* The set to check.
* @return key1 if the set contains str, or COUNT if not.
*/
public static Key chooseFrom(String str, Key key1) {
return get(key1).contains(str) ? key1 : null;
}
/**
* Checks if the UnicodeSet given by either key1 or key2 contains the string.
*
* Exported as U_COMMON_API for numparse_decimal.cpp
*
* @param str
* The string to check.
* @param key1
* The first set to check.
* @param key2
* The second set to check.
* @return key1 if that set contains str; key2 if that set contains str; or COUNT if neither set
* contains str.
*/
public static Key chooseFrom(String str, Key key1, Key key2) {
return get(key1).contains(str) ? key1 : chooseFrom(str, key2);
}
/**
* Looks through all Currency-related sets for the given string, returning the first match or null if
* no match was round.
*/
public static Key chooseCurrency(String str) {
if (get(Key.DOLLAR_SIGN).contains(str)) {
return Key.DOLLAR_SIGN;
} else if (get(Key.POUND_SIGN).contains(str)) {
return Key.POUND_SIGN;
} else if (get(Key.RUPEE_SIGN).contains(str)) {
return Key.RUPEE_SIGN;
} else if (get(Key.YEN_SIGN).contains(str)) {
return Key.YEN_SIGN;
} else if (get(Key.WON_SIGN).contains(str)) {
return Key.WON_SIGN;
} else {
return null;
}
}
private static UnicodeSet computeUnion(Key k1, Key k2) {
return new UnicodeSet().addAll(get(k1)).addAll(get(k2)).freeze();
}
private static UnicodeSet computeUnion(Key k1, Key k2, Key k3) {
return new UnicodeSet().addAll(get(k1)).addAll(get(k2)).addAll(get(k3)).freeze();
}
private static void saveSet(Key key, String unicodeSetPattern) {
assert unicodeSets.get(key) == null;
unicodeSets.put(key, new UnicodeSet(unicodeSetPattern).freeze());
}
/*
parse{
date{
lenient{
"[\\--/]",
"[\\:∶]",
}
}
general{
lenient{
"[.․。︒﹒．｡]",
"[\$﹩＄$]",
"[£₤]",
"[₨₹{Rp}{Rs}]",
}
}
number{
lenient{
"[\\-‒⁻₋−➖﹣－]",
"[,،٫、︐︑﹐﹑，､]",
"[+⁺₊➕﬩﹢＋]",
}
stricter{
"[,٫︐﹐，]",
"[.․﹒．｡]",
}
}
}
*/
static class ParseDataSink extends UResource.Sink {
@Override
public void put(com.ibm.icu.impl.UResource.Key key, Value value, boolean noFallback) {
UResource.Table contextsTable = value.getTable();
for (int i = 0; contextsTable.getKeyAndValue(i, key, value); i++) {
if (key.contentEquals("date")) {
// ignore
} else {
assert key.contentEquals("general") || key.contentEquals("number");
UResource.Table strictnessTable = value.getTable();
for (int j = 0; strictnessTable.getKeyAndValue(j, key, value); j++) {
boolean isLenient = key.contentEquals("lenient");
UResource.Array array = value.getArray();
for (int k = 0; k < array.getSize(); k++) {
array.getValue(k, value);
String str = value.toString();
// There is both lenient and strict data for comma/period,
// but not for any of the other symbols.
if (str.indexOf('.') != -1) {
saveSet(isLenient ? Key.PERIOD : Key.STRICT_PERIOD, str);
} else if (str.indexOf(',') != -1) {
saveSet(isLenient ? Key.COMMA : Key.STRICT_COMMA, str);
} else if (str.indexOf('+') != -1) {
saveSet(Key.PLUS_SIGN, str);
} else if (str.indexOf('-') != -1) {
saveSet(Key.MINUS_SIGN, str);
} else if (str.indexOf('$') != -1) {
saveSet(Key.DOLLAR_SIGN, str);
} else if (str.indexOf('£') != -1) {
saveSet(Key.POUND_SIGN, str);
} else if (str.indexOf('₹') != -1) {
saveSet(Key.RUPEE_SIGN, str);
} else if (str.indexOf('¥') != -1) {
saveSet(Key.YEN_SIGN, str);
} else if (str.indexOf('₩') != -1) {
saveSet(Key.WON_SIGN, str);
} else if (str.indexOf('%') != -1) {
saveSet(Key.PERCENT_SIGN, str);
} else if (str.indexOf('‰') != -1) {
saveSet(Key.PERMILLE_SIGN, str);
} else if (str.indexOf('’') != -1) {
saveSet(Key.APOSTROPHE_SIGN, str);
} else {
// TODO(ICU-20428): Make ICU automatically accept new classes?
throw new AssertionError("Unknown class of parse lenients: " + str);
}
}
}
}
}
}
}
static {
unicodeSets.put(Key.EMPTY, new UnicodeSet("[]").freeze());
// These sets were decided after discussion with icu-design@. See tickets #13084 and #13309.
// Zs+TAB is "horizontal whitespace" according to UTS #18 (blank property).
unicodeSets.put(Key.DEFAULT_IGNORABLES,
new UnicodeSet("[[:Zs:][\\u0009][:Bidi_Control:][:Variation_Selector:]]").freeze());
unicodeSets.put(Key.STRICT_IGNORABLES, new UnicodeSet("[[:Bidi_Control:]]").freeze());
// CLDR provides data for comma, period, minus sign, and plus sign.
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle
.getBundleInstance(ICUData.ICU_BASE_NAME, ULocale.ROOT);
rb.getAllItemsWithFallback("parse", new ParseDataSink());
// NOTE: It is OK for these assertions to fail if there was a no-data build.
assert unicodeSets.containsKey(Key.COMMA);
assert unicodeSets.containsKey(Key.STRICT_COMMA);
assert unicodeSets.containsKey(Key.PERIOD);
assert unicodeSets.containsKey(Key.STRICT_PERIOD);
assert unicodeSets.containsKey(Key.APOSTROPHE_SIGN);
UnicodeSet otherGrouping = new UnicodeSet(
"[٬‘\\u0020\\u00A0\\u2000-\\u200A\\u202F\\u205F\\u3000]");
otherGrouping.addAll(unicodeSets.get(Key.APOSTROPHE_SIGN));
unicodeSets.put(Key.OTHER_GROUPING_SEPARATORS, otherGrouping.freeze());
unicodeSets.put(Key.ALL_SEPARATORS,
computeUnion(Key.COMMA, Key.PERIOD, Key.OTHER_GROUPING_SEPARATORS));
unicodeSets.put(Key.STRICT_ALL_SEPARATORS,
computeUnion(Key.STRICT_COMMA, Key.STRICT_PERIOD, Key.OTHER_GROUPING_SEPARATORS));
assert unicodeSets.containsKey(Key.MINUS_SIGN);
assert unicodeSets.containsKey(Key.PLUS_SIGN);
assert unicodeSets.containsKey(Key.PERCENT_SIGN);
assert unicodeSets.containsKey(Key.PERMILLE_SIGN);
unicodeSets.put(Key.INFINITY_SIGN, new UnicodeSet("[∞]").freeze());
assert unicodeSets.containsKey(Key.DOLLAR_SIGN);
assert unicodeSets.containsKey(Key.POUND_SIGN);
assert unicodeSets.containsKey(Key.RUPEE_SIGN);
assert unicodeSets.containsKey(Key.YEN_SIGN);
assert unicodeSets.containsKey(Key.WON_SIGN);
unicodeSets.put(Key.DIGITS, new UnicodeSet("[:digit:]").freeze());
unicodeSets.put(Key.DIGITS_OR_ALL_SEPARATORS, computeUnion(Key.DIGITS, Key.ALL_SEPARATORS));
unicodeSets.put(Key.DIGITS_OR_STRICT_ALL_SEPARATORS,
computeUnion(Key.DIGITS, Key.STRICT_ALL_SEPARATORS));
}
}