253 lines
8.4 KiB
C++
253 lines
8.4 KiB
C++
// © 2017 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#if !UCONFIG_NO_FORMATTING
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#ifndef __NUMBER_MODIFIERS_H__
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#define __NUMBER_MODIFIERS_H__
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#include <algorithm>
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#include <cstdint>
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#include "unicode/uniset.h"
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#include "unicode/simpleformatter.h"
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#include "standardplural.h"
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#include "number_stringbuilder.h"
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#include "number_types.h"
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U_NAMESPACE_BEGIN namespace number {
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namespace impl {
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/**
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* The canonical implementation of {@link Modifier}, containing a prefix and suffix string.
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* TODO: This is not currently being used by real code and could be removed.
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*/
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class U_I18N_API ConstantAffixModifier : public Modifier, public UObject {
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public:
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ConstantAffixModifier(const UnicodeString &prefix, const UnicodeString &suffix, Field field,
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bool strong)
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: fPrefix(prefix), fSuffix(suffix), fField(field), fStrong(strong) {}
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int32_t apply(NumberStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
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UErrorCode &status) const U_OVERRIDE;
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int32_t getPrefixLength(UErrorCode &status) const U_OVERRIDE;
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int32_t getCodePointCount(UErrorCode &status) const U_OVERRIDE;
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bool isStrong() const U_OVERRIDE;
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private:
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UnicodeString fPrefix;
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UnicodeString fSuffix;
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Field fField;
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bool fStrong;
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};
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/**
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* The second primary implementation of {@link Modifier}, this one consuming a {@link SimpleFormatter}
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* pattern.
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*/
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class U_I18N_API SimpleModifier : public Modifier, public UMemory {
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public:
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SimpleModifier(const SimpleFormatter &simpleFormatter, Field field, bool strong);
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// Default constructor for LongNameHandler.h
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SimpleModifier();
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int32_t apply(NumberStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
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UErrorCode &status) const U_OVERRIDE;
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int32_t getPrefixLength(UErrorCode &status) const U_OVERRIDE;
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int32_t getCodePointCount(UErrorCode &status) const U_OVERRIDE;
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bool isStrong() const U_OVERRIDE;
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/**
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* TODO: This belongs in SimpleFormatterImpl. The only reason I haven't moved it there yet is because
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* DoubleSidedStringBuilder is an internal class and SimpleFormatterImpl feels like it should not depend on it.
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*
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* <p>
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* Formats a value that is already stored inside the StringBuilder <code>result</code> between the indices
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* <code>startIndex</code> and <code>endIndex</code> by inserting characters before the start index and after the
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* end index.
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*
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* <p>
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* This is well-defined only for patterns with exactly one argument.
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*
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* @param result
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* The StringBuilder containing the value argument.
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* @param startIndex
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* The left index of the value within the string builder.
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* @param endIndex
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* The right index of the value within the string builder.
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* @return The number of characters (UTF-16 code points) that were added to the StringBuilder.
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*/
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int32_t
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formatAsPrefixSuffix(NumberStringBuilder &result, int32_t startIndex, int32_t endIndex, Field field,
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UErrorCode &status) const;
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private:
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UnicodeString fCompiledPattern;
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Field fField;
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bool fStrong;
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int32_t fPrefixLength;
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int32_t fSuffixOffset;
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int32_t fSuffixLength;
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};
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/**
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* An implementation of {@link Modifier} that allows for multiple types of fields in the same modifier. Constructed
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* based on the contents of two {@link NumberStringBuilder} instances (one for the prefix, one for the suffix).
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*/
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class U_I18N_API ConstantMultiFieldModifier : public Modifier, public UMemory {
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public:
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ConstantMultiFieldModifier(const NumberStringBuilder &prefix, const NumberStringBuilder &suffix,
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bool strong) : fPrefix(prefix), fSuffix(suffix), fStrong(strong) {}
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int32_t apply(NumberStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
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UErrorCode &status) const U_OVERRIDE;
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int32_t getPrefixLength(UErrorCode &status) const U_OVERRIDE;
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int32_t getCodePointCount(UErrorCode &status) const U_OVERRIDE;
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bool isStrong() const U_OVERRIDE;
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protected:
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// NOTE: In Java, these are stored as array pointers. In C++, the NumberStringBuilder is stored by
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// value and is treated internally as immutable.
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NumberStringBuilder fPrefix;
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NumberStringBuilder fSuffix;
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bool fStrong;
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};
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/** Identical to {@link ConstantMultiFieldModifier}, but supports currency spacing. */
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class U_I18N_API CurrencySpacingEnabledModifier : public ConstantMultiFieldModifier {
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public:
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/** Safe code path */
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CurrencySpacingEnabledModifier(const NumberStringBuilder &prefix, const NumberStringBuilder &suffix,
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bool strong, const DecimalFormatSymbols &symbols, UErrorCode &status);
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int32_t apply(NumberStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
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UErrorCode &status) const U_OVERRIDE;
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/** Unsafe code path */
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static int32_t
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applyCurrencySpacing(NumberStringBuilder &output, int32_t prefixStart, int32_t prefixLen,
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int32_t suffixStart, int32_t suffixLen, const DecimalFormatSymbols &symbols,
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UErrorCode &status);
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private:
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UnicodeSet fAfterPrefixUnicodeSet;
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UnicodeString fAfterPrefixInsert;
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UnicodeSet fBeforeSuffixUnicodeSet;
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UnicodeString fBeforeSuffixInsert;
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enum EAffix {
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PREFIX, SUFFIX
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};
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enum EPosition {
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IN_CURRENCY, IN_NUMBER
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};
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/** Unsafe code path */
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static int32_t applyCurrencySpacingAffix(NumberStringBuilder &output, int32_t index, EAffix affix,
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const DecimalFormatSymbols &symbols, UErrorCode &status);
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static UnicodeSet
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getUnicodeSet(const DecimalFormatSymbols &symbols, EPosition position, EAffix affix,
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UErrorCode &status);
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static UnicodeString
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getInsertString(const DecimalFormatSymbols &symbols, EAffix affix, UErrorCode &status);
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};
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/** A Modifier that does not do anything. */
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class U_I18N_API EmptyModifier : public Modifier, public UMemory {
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public:
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explicit EmptyModifier(bool isStrong) : fStrong(isStrong) {}
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int32_t apply(NumberStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
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UErrorCode &status) const U_OVERRIDE {
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(void)output;
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(void)leftIndex;
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(void)rightIndex;
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(void)status;
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return 0;
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}
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int32_t getPrefixLength(UErrorCode &status) const U_OVERRIDE {
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(void)status;
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return 0;
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}
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int32_t getCodePointCount(UErrorCode &status) const U_OVERRIDE {
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(void)status;
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return 0;
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}
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bool isStrong() const U_OVERRIDE {
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return fStrong;
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}
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private:
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bool fStrong;
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};
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/**
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* A ParameterizedModifier by itself is NOT a Modifier. Rather, it wraps a data structure containing two or more
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* Modifiers and returns the modifier appropriate for the current situation.
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*/
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class U_I18N_API ParameterizedModifier : public UMemory {
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public:
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// NOTE: mods is zero-initialized (to nullptr)
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ParameterizedModifier() : mods() {
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}
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// No copying!
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ParameterizedModifier(const ParameterizedModifier &other) = delete;
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~ParameterizedModifier() {
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for (const Modifier *mod : mods) {
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delete mod;
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}
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}
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void adoptPositiveNegativeModifiers(const Modifier *positive, const Modifier *negative) {
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mods[0] = positive;
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mods[1] = negative;
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}
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/** The modifier is ADOPTED. */
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void adoptSignPluralModifier(bool isNegative, StandardPlural::Form plural, const Modifier *mod) {
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mods[getModIndex(isNegative, plural)] = mod;
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}
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/** Returns a reference to the modifier; no ownership change. */
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const Modifier *getModifier(bool isNegative) const {
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return mods[isNegative ? 1 : 0];
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}
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/** Returns a reference to the modifier; no ownership change. */
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const Modifier *getModifier(bool isNegative, StandardPlural::Form plural) const {
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return mods[getModIndex(isNegative, plural)];
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}
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private:
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const Modifier *mods[2 * StandardPlural::COUNT];
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inline static int32_t getModIndex(bool isNegative, StandardPlural::Form plural) {
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return static_cast<int32_t>(plural) * 2 + (isNegative ? 1 : 0);
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}
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};
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} // namespace impl
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} // namespace number
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U_NAMESPACE_END
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#endif //__NUMBER_MODIFIERS_H__
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#endif /* #if !UCONFIG_NO_FORMATTING */
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