// -------------------------------------------------------------------------
// Static class methods.
// -------------------------------------------------------------------------
/// <summary>
/// Provides access to the predefined <c>PluralRules</c> for a given
/// locale.
/// </summary>
///
/// <param name="locale">The locale for which a <c>PluralRules</c> object isreturned.</param>
/// <returns>The predefined <c>PluralRules</c> object for this locale.
/// If there's no predefined rules for this locale, the rules for the
/// closest parent in the locale hierarchy that has one will be
/// returned. The final fallback always returns the default rules.</returns>
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public static PluralRules ForLocale(ULocale locale)
{
PluralRules result = null;
while (null == (result = (PluralRules)ILOG.J2CsMapping.Collections.Collections.Get(ruleMap, locale.GetName())))
{
locale = locale.GetFallback();
if (locale == null)
{
return(DEFAULT);
}
}
return(result);
}
/// <exclude/>
/// <summary>
/// Attempt to parse the given string as a currency, either as a display name
/// in the given locale, or as a 3-letter ISO 4217 code. If multiple display
/// names match, then the longest one is selected. If both a display name and
/// a 3-letter ISO code match, then the display name is preferred, unless
/// it's length is less than 3.
/// </summary>
///
/// <param name="locale">the locale of the display names to match</param>
/// <param name="text">the text to parse</param>
/// <param name="pos">input-output position; on input, the position within text tomatch; must have 0 <= pos.getIndex() < text.length(); onoutput, the position after the last matched character. If theparse fails, the position in unchanged upon output.</param>
/// <returns>the ISO 4217 code, as a string, of the best match, or null if
/// there is no match</returns>
public static String Parse(ULocale locale, String text, ILOG.J2CsMapping.Text.ParsePosition pos)
{
// TODO: There is a slight problem with the pseudo-multi-level
// fallback implemented here. More-specific locales don't
// properly shield duplicate entries in less-specific locales.
// This problem will go away when real multi-level fallback is
// implemented. We could also fix this by recording (in a
// hash) which codes are used at each level of fallback, but
// this doesn't seem warranted.
int start = pos.GetIndex();
String fragment = text.Substring(start);
String iso = null;
int max = 0;
// Look up the Currencies resource for the given locale. The
// Currencies locale data looks like this:
// |en {
// | Currencies {
// | USD { "US$", "US Dollar" }
// | CHF { "Sw F", "Swiss Franc" }
// | INR { "=0#Rs|1#Re|1<Rs", "=0#Rupees|1#Rupee|1<Rupees" }
// | //...
// | }
// |}
// In the future, resource bundles may implement multi-level
// fallback. That is, if a currency is not found in the en_US
// Currencies data, then the en Currencies data will be searched.
// Currently, if a Currencies datum exists in en_US and en, the
// en_US entry hides that in en.
// We want multi-level fallback for this resource, so we implement
// it manually.
// Multi-level resource inheritance fallback loop
while (locale != null)
{
UResourceBundle rb = IBM.ICU.Util.UResourceBundle.GetBundleInstance(
IBM.ICU.Impl.ICUResourceBundle.ICU_BASE_NAME, locale);
// We can't cast this to String[][]; the cast has to happen later
try {
UResourceBundle currencies = rb.Get("Currencies");
// Do a linear search
for (int i = 0; i < currencies.GetSize(); ++i)
{
// String name = ((String[]) currencies[i][1])[0];
UResourceBundle item = currencies.Get(i);
String name = item.GetString(0);
if (name.Length < 1)
{
// Ignore zero-length names -- later, change this
// when zero-length is used to mean something.
continue;
}
else if (name[0] == '=')
{
name = name.Substring(1);
if (name.Length > 0 && name[0] != '=')
{
ChoiceFormat choice = new ChoiceFormat(name);
// Number n =
choice.Parse(text, pos);
int len = pos.GetIndex() - start;
if (len > max)
{
iso = item.GetKey();
max = len;
}
pos.SetIndex(start);
continue;
}
}
if (name.Length > max && fragment.StartsWith(name))
{
iso = item.GetKey();
max = name.Length;
}
}
} catch (MissingManifestResourceException e) {
}
locale = locale.GetFallback();
}
/*
* 1. Look at the Currencies array from the locale 1a. Iterate through
* it, and check each row to see if row[1] matches 1a1. If row[1] is a
* pattern, use ChoiceFormat to attempt a parse 1b. Upon a match, return
* the ISO code stored at row[0] 2. If there is no match, fall back to
* "en" and try again 3. If there is no match, fall back to root and try
* again 4. If still no match, parse 3-letter ISO {this code is probably
* unchanged}.
*
* ICUResourceBundle rb =
* (ICUResourceBundle)UResourceBundle.getBundleInstance
* (UResourceBundle.ICU_BASE_NAME, locale); ICUResourceBundle currencies
* = rb.get("Currencies");
*/
// If display name parse fails or if it matches fewer than 3
// characters, try to parse 3-letter ISO. Do this after the
// display name processing so 3-letter display names are
// preferred. Consider /[A-Z]{3}/ to be valid ISO, and parse
// it manually--UnicodeSet/regex are too slow and heavy.
if (max < 3 && (text.Length - start) >= 3)
{
bool valid = true;
for (int k = 0; k < 3; ++k)
{
char ch = text[start + k]; // 16-bit ok
if (ch < 'A' || ch > 'Z')
{
valid = false;
break;
}
}
if (valid)
{
iso = text.Substring(start, (start + 3) - (start));
max = 3;
}
}
pos.SetIndex(start + max);
return(iso);
}