277 lines
9.1 KiB
C++
277 lines
9.1 KiB
C++
/********************************************************************
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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#License
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*************************************************************************
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*************************************************************************
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* COPYRIGHT:
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* Copyright (c) 1999-2014, International Business Machines Corporation and
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* others. All Rights Reserved.
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*************************************************************************/
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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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#include "unicode/numfmt.h"
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#include "unicode/dcfmtsym.h"
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#include "unicode/decimfmt.h"
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#include "unicode/locid.h"
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#include "unicode/uclean.h"
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#include "util.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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extern "C" void capi();
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void cppapi();
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static void
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showCurrencyFormatting(UBool useICU26API);
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int main(int argc, char **argv) {
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printf("%s output is in UTF-8\n", argv[0]);
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printf("C++ API\n");
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cppapi();
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printf("C API\n");
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capi();
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showCurrencyFormatting(FALSE);
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showCurrencyFormatting(TRUE);
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u_cleanup(); // Release any additional storage held by ICU.
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printf("Exiting successfully\n");
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return 0;
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}
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/**
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* Sample code for the C++ API to NumberFormat.
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*/
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void cppapi() {
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Locale us("en", "US");
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UErrorCode status = U_ZERO_ERROR;
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// Create a number formatter for the US locale
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NumberFormat *fmt = NumberFormat::createInstance(us, status);
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check(status, "NumberFormat::createInstance");
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// Parse a string. The string uses the digits '0' through '9'
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// and the decimal separator '.', standard in the US locale
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UnicodeString str("9876543210.123");
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Formattable result;
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fmt->parse(str, result, status);
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check(status, "NumberFormat::parse");
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printf("NumberFormat::parse(\""); // Display the result
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uprintf(str);
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printf("\") => ");
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uprintf(formattableToString(result));
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printf("\n");
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// Take the number parsed above, and use the formatter to
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// format it.
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str.remove(); // format() will APPEND to this string
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fmt->format(result, str, status);
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check(status, "NumberFormat::format");
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printf("NumberFormat::format("); // Display the result
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uprintf(formattableToString(result));
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printf(") => \"");
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uprintf(str);
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printf("\"\n");
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delete fmt; // Release the storage used by the formatter
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}
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// currency formatting ----------------------------------------------------- ***
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/*
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* Set a currency on a NumberFormat with pre-ICU 2.6 APIs.
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* This is a "hack" that will not work properly for all cases because
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* only ICU 2.6 introduced a more complete framework and data for this.
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*
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* @param nf The NumberFormat on which to set the currency; takes effect on
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* currency-formatting NumberFormat instances.
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* This must actually be a DecimalFormat instance.
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* The display style of the output is controlled by nf (its pattern,
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* usually from the display locale ID used to create this instance)
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* while the currency symbol and number of decimals are set for
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* the currency.
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* @param currency The 3-letter ISO 4217 currency code, NUL-terminated.
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* @param errorCode ICU error code, must pass U_SUCCESS() on input.
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*/
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static void
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setNumberFormatCurrency_2_4(NumberFormat &nf, const char *currency, UErrorCode &errorCode) {
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// argument checking
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if(U_FAILURE(errorCode)) {
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return;
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}
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if(currency==NULL || strlen(currency)!=3) {
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errorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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// check that the formatter is a DecimalFormat instance
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// necessary because we will cast to the DecimalFormat subclass to set
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// the currency symbol
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DecimalFormat *dnf=dynamic_cast<DecimalFormat *>(&nf);
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if(dnf==NULL) {
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errorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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// map the currency code to a locale ID
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// only the currencies in this array are supported
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// it would be possible to map to a locale ID, instantiate a currency
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// formatter for that and copy its values, but that would be slower,
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// and we have to hardcode something here anyway
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static const struct {
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// ISO currency ID
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const char *currency;
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// fractionDigits==minimumFractionDigits==maximumFractionDigits
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// for these currencies
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int32_t fractionDigits;
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/*
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* Set the rounding increment to 0 if it is implied with the number of
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* fraction digits. Setting an explicit rounding increment makes
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* number formatting slower.
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* In other words, set it to something other than 0 only for unusual
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* cases like "nickel rounding" (0.05) when the increment differs from
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* 10^(-maximumFractionDigits).
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*/
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double roundingIncrement;
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// Unicode string with the desired currency display symbol or name
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UChar symbol[16];
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} currencyMap[]={
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{ "USD", 2, 0.0, { 0x24, 0 } },
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{ "GBP", 2, 0.0, { 0xa3, 0 } },
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{ "EUR", 2, 0.0, { 0x20ac, 0 } },
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{ "JPY", 0, 0.0, { 0xa5, 0 } }
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};
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int32_t i;
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for(i=0; i<UPRV_LENGTHOF(currencyMap); ++i) {
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if(strcmp(currency, currencyMap[i].currency)==0) {
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break;
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}
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}
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if(i==UPRV_LENGTHOF(currencyMap)) {
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// a more specific error code would be useful in a real application
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errorCode=U_UNSUPPORTED_ERROR;
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return;
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}
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// set the currency-related data into the caller's formatter
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nf.setMinimumFractionDigits(currencyMap[i].fractionDigits);
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nf.setMaximumFractionDigits(currencyMap[i].fractionDigits);
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dnf->setRoundingIncrement(currencyMap[i].roundingIncrement);
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DecimalFormatSymbols symbols(*dnf->getDecimalFormatSymbols());
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symbols.setSymbol(DecimalFormatSymbols::kCurrencySymbol, currencyMap[i].symbol);
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dnf->setDecimalFormatSymbols(symbols); // do not adopt symbols: Jitterbug 2889
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}
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/*
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* Set a currency on a NumberFormat with ICU 2.6 APIs.
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*
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* @param nf The NumberFormat on which to set the currency; takes effect on
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* currency-formatting NumberFormat instances.
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* The display style of the output is controlled by nf (its pattern,
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* usually from the display locale ID used to create this instance)
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* while the currency symbol and number of decimals are set for
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* the currency.
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* @param currency The 3-letter ISO 4217 currency code, NUL-terminated.
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* @param errorCode ICU error code, must pass U_SUCCESS() on input.
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*/
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static void
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setNumberFormatCurrency_2_6(NumberFormat &nf, const char *currency, UErrorCode &errorCode) {
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if(U_FAILURE(errorCode)) {
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return;
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}
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if(currency==NULL || strlen(currency)!=3) {
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errorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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// invariant-character conversion to UChars (see utypes.h and putil.h)
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UChar uCurrency[4];
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u_charsToUChars(currency, uCurrency, 4);
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// set the currency
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// in ICU 3.0 this API (which was @draft ICU 2.6) gained a UErrorCode& argument
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#if (U_ICU_VERSION_MAJOR_NUM < 3)
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nf.setCurrency(uCurrency);
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#else
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nf.setCurrency(uCurrency, errorCode);
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#endif
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}
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static const char *const
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sampleLocaleIDs[]={
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// use locale IDs complete with country code to be sure to
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// pick up number/currency format patterns
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"en_US", "en_GB", "de_DE", "ja_JP", "fr_FR", "hi_IN"
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};
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static const char *const
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sampleCurrencies[]={
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"USD", "GBP", "EUR", "JPY"
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};
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static void
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showCurrencyFormatting(UBool useICU26API) {
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NumberFormat *nf;
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int32_t i, j;
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UnicodeString output;
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UErrorCode errorCode;
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// TODO: Using printf() here assumes that the runtime encoding is ASCII-friendly
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// and can therefore be mixed with UTF-8
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for(i=0; i<UPRV_LENGTHOF(sampleLocaleIDs); ++i) {
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printf("show currency formatting (method for %s) in the locale \"%s\"\n",
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useICU26API ? "ICU 2.6" : "before ICU 2.6",
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sampleLocaleIDs[i]);
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// get a currency formatter for this locale ID
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errorCode=U_ZERO_ERROR;
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nf=NumberFormat::createCurrencyInstance(sampleLocaleIDs[i], errorCode);
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if(U_FAILURE(errorCode)) {
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printf("NumberFormat::createCurrencyInstance(%s) failed - %s\n",
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sampleLocaleIDs[i], u_errorName(errorCode));
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continue;
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}
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for(j=0; j<UPRV_LENGTHOF(sampleCurrencies); ++j) {
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printf(" - format currency \"%s\": ", sampleCurrencies[j]);
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// set the actual currency to be formatted
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if(useICU26API) {
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setNumberFormatCurrency_2_6(*nf, sampleCurrencies[j], errorCode);
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} else {
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setNumberFormatCurrency_2_4(*nf, sampleCurrencies[j], errorCode);
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}
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if(U_FAILURE(errorCode)) {
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printf("setNumberFormatCurrency(%s) failed - %s\n",
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sampleCurrencies[j], u_errorName(errorCode));
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continue;
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}
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// output=formatted currency value
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output.remove();
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nf->format(12345678.93, output);
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output+=(UChar)0x0a; // '\n'
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uprintf(output);
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}
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}
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}
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