329 lines
11 KiB
C++
329 lines
11 KiB
C++
// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#ifndef __SOURCE_NUMBER_SKELETONS_H__
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#define __SOURCE_NUMBER_SKELETONS_H__
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#include "number_types.h"
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#include "numparse_types.h"
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#include "unicode/ucharstrie.h"
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using icu::numparse::impl::StringSegment;
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U_NAMESPACE_BEGIN namespace number {
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namespace impl {
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// Forward-declaration
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struct SeenMacroProps;
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// namespace for enums and entrypoint functions
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namespace skeleton {
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///////////////////////////////////////////////////////////////////////////////////////
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// NOTE: For an example of how to add a new stem to the number skeleton parser, see: //
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// http://bugs.icu-project.org/trac/changeset/41193 //
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///////////////////////////////////////////////////////////////////////////////////////
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/**
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* While parsing a skeleton, this enum records what type of option we expect to find next.
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*/
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enum ParseState {
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// Section 0: We expect whitespace or a stem, but not an option:
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STATE_NULL,
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// Section 1: We might accept an option, but it is not required:
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STATE_SCIENTIFIC,
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STATE_FRACTION_PRECISION,
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// Section 2: An option is required:
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STATE_INCREMENT_PRECISION,
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STATE_MEASURE_UNIT,
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STATE_PER_MEASURE_UNIT,
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STATE_CURRENCY_UNIT,
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STATE_INTEGER_WIDTH,
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STATE_NUMBERING_SYSTEM,
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STATE_SCALE,
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};
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/**
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* All possible stem literals have an entry in the StemEnum. The enum name is the kebab case stem
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* string literal written in upper snake case.
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*
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* @see StemToObject
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* @see #SERIALIZED_STEM_TRIE
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*/
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enum StemEnum {
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// Section 1: Stems that do not require an option:
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STEM_COMPACT_SHORT,
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STEM_COMPACT_LONG,
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STEM_SCIENTIFIC,
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STEM_ENGINEERING,
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STEM_NOTATION_SIMPLE,
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STEM_BASE_UNIT,
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STEM_PERCENT,
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STEM_PERMILLE,
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STEM_PRECISION_INTEGER,
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STEM_PRECISION_UNLIMITED,
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STEM_PRECISION_CURRENCY_STANDARD,
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STEM_PRECISION_CURRENCY_CASH,
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STEM_ROUNDING_MODE_CEILING,
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STEM_ROUNDING_MODE_FLOOR,
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STEM_ROUNDING_MODE_DOWN,
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STEM_ROUNDING_MODE_UP,
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STEM_ROUNDING_MODE_HALF_EVEN,
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STEM_ROUNDING_MODE_HALF_DOWN,
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STEM_ROUNDING_MODE_HALF_UP,
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STEM_ROUNDING_MODE_UNNECESSARY,
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STEM_GROUP_OFF,
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STEM_GROUP_MIN2,
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STEM_GROUP_AUTO,
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STEM_GROUP_ON_ALIGNED,
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STEM_GROUP_THOUSANDS,
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STEM_LATIN,
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STEM_UNIT_WIDTH_NARROW,
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STEM_UNIT_WIDTH_SHORT,
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STEM_UNIT_WIDTH_FULL_NAME,
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STEM_UNIT_WIDTH_ISO_CODE,
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STEM_UNIT_WIDTH_HIDDEN,
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STEM_SIGN_AUTO,
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STEM_SIGN_ALWAYS,
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STEM_SIGN_NEVER,
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STEM_SIGN_ACCOUNTING,
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STEM_SIGN_ACCOUNTING_ALWAYS,
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STEM_SIGN_EXCEPT_ZERO,
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STEM_SIGN_ACCOUNTING_EXCEPT_ZERO,
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STEM_DECIMAL_AUTO,
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STEM_DECIMAL_ALWAYS,
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// Section 2: Stems that DO require an option:
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STEM_PRECISION_INCREMENT,
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STEM_MEASURE_UNIT,
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STEM_PER_MEASURE_UNIT,
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STEM_CURRENCY,
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STEM_INTEGER_WIDTH,
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STEM_NUMBERING_SYSTEM,
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STEM_SCALE,
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};
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/**
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* Creates a NumberFormatter corresponding to the given skeleton string.
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*
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* @param skeletonString
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* A number skeleton string, possibly not in its shortest form.
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* @return An UnlocalizedNumberFormatter with behavior defined by the given skeleton string.
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*/
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UnlocalizedNumberFormatter create(
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const UnicodeString& skeletonString, UParseError* perror, UErrorCode& status);
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/**
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* Create a skeleton string corresponding to the given NumberFormatter.
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*
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* @param macros
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* The NumberFormatter options object.
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* @return A skeleton string in normalized form.
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*/
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UnicodeString generate(const MacroProps& macros, UErrorCode& status);
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/**
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* Converts from a skeleton string to a MacroProps. This method contains the primary parse loop.
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*
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* Internal: use the create() endpoint instead of this function.
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*/
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MacroProps parseSkeleton(const UnicodeString& skeletonString, int32_t& errOffset, UErrorCode& status);
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/**
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* Given that the current segment represents a stem, parse it and save the result.
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*
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* @return The next state after parsing this stem, corresponding to what subset of options to expect.
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*/
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ParseState parseStem(const StringSegment& segment, const UCharsTrie& stemTrie, SeenMacroProps& seen,
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MacroProps& macros, UErrorCode& status);
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/**
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* Given that the current segment represents an option, parse it and save the result.
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*
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* @return The next state after parsing this option, corresponding to what subset of options to
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* expect next.
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*/
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ParseState
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parseOption(ParseState stem, const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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} // namespace skeleton
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/**
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* Namespace for utility methods that convert from StemEnum to corresponding objects or enums. This
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* applies to only the "Section 1" stems, those that are well-defined without an option.
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*/
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namespace stem_to_object {
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Notation notation(skeleton::StemEnum stem);
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MeasureUnit unit(skeleton::StemEnum stem);
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Precision precision(skeleton::StemEnum stem);
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UNumberFormatRoundingMode roundingMode(skeleton::StemEnum stem);
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UNumberGroupingStrategy groupingStrategy(skeleton::StemEnum stem);
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UNumberUnitWidth unitWidth(skeleton::StemEnum stem);
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UNumberSignDisplay signDisplay(skeleton::StemEnum stem);
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UNumberDecimalSeparatorDisplay decimalSeparatorDisplay(skeleton::StemEnum stem);
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} // namespace stem_to_object
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/**
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* Namespace for utility methods that convert from enums to stem strings. More complex object conversions
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* take place in the object_to_stem_string namespace.
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*/
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namespace enum_to_stem_string {
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void roundingMode(UNumberFormatRoundingMode value, UnicodeString& sb);
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void groupingStrategy(UNumberGroupingStrategy value, UnicodeString& sb);
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void unitWidth(UNumberUnitWidth value, UnicodeString& sb);
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void signDisplay(UNumberSignDisplay value, UnicodeString& sb);
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void decimalSeparatorDisplay(UNumberDecimalSeparatorDisplay value, UnicodeString& sb);
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} // namespace enum_to_stem_string
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/**
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* Namespace for utility methods for processing stems and options that cannot be interpreted literally.
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*/
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namespace blueprint_helpers {
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/** @return Whether we successfully found and parsed an exponent width option. */
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bool parseExponentWidthOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateExponentWidthOption(int32_t minExponentDigits, UnicodeString& sb, UErrorCode& status);
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/** @return Whether we successfully found and parsed an exponent sign option. */
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bool parseExponentSignOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void parseCurrencyOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateCurrencyOption(const CurrencyUnit& currency, UnicodeString& sb, UErrorCode& status);
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void parseMeasureUnitOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateMeasureUnitOption(const MeasureUnit& measureUnit, UnicodeString& sb, UErrorCode& status);
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void parseMeasurePerUnitOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void parseFractionStem(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateFractionStem(int32_t minFrac, int32_t maxFrac, UnicodeString& sb, UErrorCode& status);
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void parseDigitsStem(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateDigitsStem(int32_t minSig, int32_t maxSig, UnicodeString& sb, UErrorCode& status);
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/** @return Whether we successfully found and parsed a frac-sig option. */
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bool parseFracSigOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void parseIncrementOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void
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generateIncrementOption(double increment, int32_t trailingZeros, UnicodeString& sb, UErrorCode& status);
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void parseIntegerWidthOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateIntegerWidthOption(int32_t minInt, int32_t maxInt, UnicodeString& sb, UErrorCode& status);
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void parseNumberingSystemOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateNumberingSystemOption(const NumberingSystem& ns, UnicodeString& sb, UErrorCode& status);
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void parseScaleOption(const StringSegment& segment, MacroProps& macros, UErrorCode& status);
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void generateScaleOption(int32_t magnitude, const DecNum* arbitrary, UnicodeString& sb,
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UErrorCode& status);
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} // namespace blueprint_helpers
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/**
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* Class for utility methods for generating a token corresponding to each macro-prop. Each method
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* returns whether or not a token was written to the string builder.
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*
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* This needs to be a class, not a namespace, so it can be friended.
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*/
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class GeneratorHelpers {
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public:
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/**
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* Main skeleton generator function. Appends the normalized skeleton for the MacroProps to the given
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* StringBuilder.
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*
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* Internal: use the create() endpoint instead of this function.
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*/
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static void generateSkeleton(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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private:
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static bool notation(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool unit(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool perUnit(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool precision(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool roundingMode(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool grouping(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool integerWidth(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool symbols(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool unitWidth(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool sign(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool decimal(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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static bool scale(const MacroProps& macros, UnicodeString& sb, UErrorCode& status);
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};
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/**
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* Struct for null-checking.
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* In Java, we can just check the object reference. In C++, we need a different method.
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*/
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struct SeenMacroProps {
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bool notation = false;
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bool unit = false;
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bool perUnit = false;
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bool precision = false;
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bool roundingMode = false;
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bool grouper = false;
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bool padder = false;
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bool integerWidth = false;
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bool symbols = false;
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bool unitWidth = false;
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bool sign = false;
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bool decimal = false;
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bool scale = false;
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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 //__SOURCE_NUMBER_SKELETONS_H__
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#endif /* #if !UCONFIG_NO_FORMATTING */
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