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310 lines
10 KiB
310 lines
10 KiB
4 months ago
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// © 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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#ifndef __FORMVAL_IMPL_H__
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#define __FORMVAL_IMPL_H__
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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// This file contains compliant implementations of FormattedValue which can be
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// leveraged by ICU formatters.
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//
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// Each implementation is defined in its own cpp file in order to split
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// dependencies more modularly.
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#include "unicode/formattedvalue.h"
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#include "capi_helper.h"
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#include "fphdlimp.h"
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#include "util.h"
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#include "uvectr32.h"
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#include "formatted_string_builder.h"
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/**
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* Represents the type of constraint for ConstrainedFieldPosition.
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*
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* Constraints are used to control the behavior of iteration in FormattedValue.
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*
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* @internal
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*/
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typedef enum UCFPosConstraintType {
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/**
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* Represents the lack of a constraint.
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*
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* This is the value of fConstraint if no "constrain" methods were called.
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*
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* @internal
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*/
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UCFPOS_CONSTRAINT_NONE = 0,
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/**
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* Represents that the field category is constrained.
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*
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* This is the value of fConstraint if constraintCategory was called.
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*
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* FormattedValue implementations should not change the field category
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* while this constraint is active.
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*
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* @internal
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*/
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UCFPOS_CONSTRAINT_CATEGORY,
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/**
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* Represents that the field and field category are constrained.
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*
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* This is the value of fConstraint if constraintField was called.
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*
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* FormattedValue implementations should not change the field or field category
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* while this constraint is active.
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*
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* @internal
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*/
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UCFPOS_CONSTRAINT_FIELD
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} UCFPosConstraintType;
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U_NAMESPACE_BEGIN
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/**
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* Implementation of FormattedValue using FieldPositionHandler to accept fields.
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*
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* TODO(ICU-20897): This class is unused. If it is not needed when fixing ICU-20897,
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* it should be deleted.
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*/
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class FormattedValueFieldPositionIteratorImpl : public UMemory, public FormattedValue {
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public:
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/** @param initialFieldCapacity Initially allocate space for this many fields. */
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FormattedValueFieldPositionIteratorImpl(int32_t initialFieldCapacity, UErrorCode& status);
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virtual ~FormattedValueFieldPositionIteratorImpl();
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// Implementation of FormattedValue (const):
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UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
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UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
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Appendable& appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
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UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
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// Additional methods used during construction phase only (non-const):
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FieldPositionIteratorHandler getHandler(UErrorCode& status);
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void appendString(UnicodeString string, UErrorCode& status);
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/**
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* Computes the spans for duplicated values.
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* For example, if the string has fields:
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*
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* ...aa..[b.cc]..d.[bb.e.c]..a..
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*
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* then the spans will be the bracketed regions.
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*
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* Assumes that the currently known fields are sorted
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* and all in the same category.
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*/
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void addOverlapSpans(UFieldCategory spanCategory, int8_t firstIndex, UErrorCode& status);
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/**
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* Sorts the fields: start index first, length second.
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*/
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void sort();
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private:
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UnicodeString fString;
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UVector32 fFields;
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};
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// Internal struct that must be exported for MSVC
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struct U_I18N_API SpanInfo {
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int32_t spanValue;
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int32_t length;
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};
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// Export an explicit template instantiation of the MaybeStackArray that
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// is used as a data member of CEBuffer.
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//
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// When building DLLs for Windows this is required even though
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// no direct access to the MaybeStackArray leaks out of the i18n library.
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//
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// See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples.
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//
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#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN
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template class U_I18N_API MaybeStackArray<SpanInfo, 8>;
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#endif
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/**
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* Implementation of FormattedValue based on FormattedStringBuilder.
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*
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* The implementation currently revolves around numbers and number fields.
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* However, it can be generalized in the future when there is a need.
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*
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* @author sffc (Shane Carr)
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*/
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// Exported as U_I18N_API for tests
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class U_I18N_API FormattedValueStringBuilderImpl : public UMemory, public FormattedValue {
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public:
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FormattedValueStringBuilderImpl(FormattedStringBuilder::Field numericField);
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virtual ~FormattedValueStringBuilderImpl();
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// Implementation of FormattedValue (const):
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UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
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UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
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Appendable& appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
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UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
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// Additional helper functions:
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UBool nextFieldPosition(FieldPosition& fp, UErrorCode& status) const;
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void getAllFieldPositions(FieldPositionIteratorHandler& fpih, UErrorCode& status) const;
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inline FormattedStringBuilder& getStringRef() {
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return fString;
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}
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inline const FormattedStringBuilder& getStringRef() const {
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return fString;
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}
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/**
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* Adds additional metadata used for span fields.
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*
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* spanValue: the index of the list item, for example.
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* length: the length of the span, used to split adjacent fields.
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*/
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void appendSpanInfo(int32_t spanValue, int32_t length, UErrorCode& status);
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void prependSpanInfo(int32_t spanValue, int32_t length, UErrorCode& status);
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private:
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FormattedStringBuilder fString;
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FormattedStringBuilder::Field fNumericField;
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MaybeStackArray<SpanInfo, 8> spanIndices;
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bool nextPositionImpl(ConstrainedFieldPosition& cfpos, FormattedStringBuilder::Field numericField, UErrorCode& status) const;
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static bool isIntOrGroup(FormattedStringBuilder::Field field);
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static bool isTrimmable(FormattedStringBuilder::Field field);
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int32_t trimBack(int32_t limit) const;
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int32_t trimFront(int32_t start) const;
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};
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// C API Helpers for FormattedValue
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// Magic number as ASCII == "UFV"
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struct UFormattedValueImpl;
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typedef IcuCApiHelper<UFormattedValue, UFormattedValueImpl, 0x55465600> UFormattedValueApiHelper;
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struct UFormattedValueImpl : public UMemory, public UFormattedValueApiHelper {
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// This pointer should be set by the child class.
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FormattedValue* fFormattedValue = nullptr;
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};
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/** Boilerplate to check for valid status before dereferencing the fData pointer. */
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#define UPRV_FORMATTED_VALUE_METHOD_GUARD(returnExpression) \
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if (U_FAILURE(status)) { \
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return returnExpression; \
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} \
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if (fData == nullptr) { \
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status = fErrorCode; \
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return returnExpression; \
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} \
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/** Implementation of the methods from U_FORMATTED_VALUE_SUBCLASS_AUTO. */
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#define UPRV_FORMATTED_VALUE_SUBCLASS_AUTO_IMPL(Name) \
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Name::Name(Name&& src) U_NOEXCEPT \
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: fData(src.fData), fErrorCode(src.fErrorCode) { \
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src.fData = nullptr; \
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src.fErrorCode = U_INVALID_STATE_ERROR; \
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} \
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Name::~Name() { \
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delete fData; \
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fData = nullptr; \
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} \
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Name& Name::operator=(Name&& src) U_NOEXCEPT { \
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delete fData; \
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fData = src.fData; \
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src.fData = nullptr; \
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fErrorCode = src.fErrorCode; \
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src.fErrorCode = U_INVALID_STATE_ERROR; \
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return *this; \
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} \
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UnicodeString Name::toString(UErrorCode& status) const { \
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UPRV_FORMATTED_VALUE_METHOD_GUARD(ICU_Utility::makeBogusString()) \
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return fData->toString(status); \
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} \
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UnicodeString Name::toTempString(UErrorCode& status) const { \
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UPRV_FORMATTED_VALUE_METHOD_GUARD(ICU_Utility::makeBogusString()) \
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return fData->toTempString(status); \
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} \
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Appendable& Name::appendTo(Appendable& appendable, UErrorCode& status) const { \
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UPRV_FORMATTED_VALUE_METHOD_GUARD(appendable) \
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return fData->appendTo(appendable, status); \
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} \
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UBool Name::nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const { \
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UPRV_FORMATTED_VALUE_METHOD_GUARD(false) \
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return fData->nextPosition(cfpos, status); \
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}
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/** Like UPRV_FORMATTED_VALUE_CAPI_AUTO_IMPL but without impl type declarations. */
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#define UPRV_FORMATTED_VALUE_CAPI_NO_IMPLTYPE_AUTO_IMPL(CType, ImplType, HelperType, Prefix) \
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U_CAPI CType* U_EXPORT2 \
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Prefix ## _openResult (UErrorCode* ec) { \
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if (U_FAILURE(*ec)) { \
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return nullptr; \
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} \
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ImplType* impl = new ImplType(); \
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if (impl == nullptr) { \
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*ec = U_MEMORY_ALLOCATION_ERROR; \
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return nullptr; \
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} \
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return static_cast<HelperType*>(impl)->exportForC(); \
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} \
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U_CAPI const UFormattedValue* U_EXPORT2 \
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Prefix ## _resultAsValue (const CType* uresult, UErrorCode* ec) { \
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const ImplType* result = HelperType::validate(uresult, *ec); \
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if (U_FAILURE(*ec)) { return nullptr; } \
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return static_cast<const UFormattedValueApiHelper*>(result)->exportConstForC(); \
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} \
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U_CAPI void U_EXPORT2 \
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Prefix ## _closeResult (CType* uresult) { \
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UErrorCode localStatus = U_ZERO_ERROR; \
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const ImplType* impl = HelperType::validate(uresult, localStatus); \
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delete impl; \
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}
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/**
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* Implementation of the standard methods for a UFormattedValue "subclass" C API.
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* @param CPPType The public C++ type, like FormattedList
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* @param CType The public C type, like UFormattedList
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* @param ImplType A name to use for the implementation class
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* @param HelperType A name to use for the "mixin" typedef for C API conversion
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* @param Prefix The C API prefix, like ulistfmt
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* @param MagicNumber A unique 32-bit number to use to identify this type
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*/
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#define UPRV_FORMATTED_VALUE_CAPI_AUTO_IMPL(CPPType, CType, ImplType, HelperType, Prefix, MagicNumber) \
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U_NAMESPACE_BEGIN \
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class ImplType; \
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typedef IcuCApiHelper<CType, ImplType, MagicNumber> HelperType; \
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class ImplType : public UFormattedValueImpl, public HelperType { \
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public: \
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ImplType(); \
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~ImplType(); \
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CPPType fImpl; \
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}; \
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ImplType::ImplType() { \
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fFormattedValue = &fImpl; \
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} \
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ImplType::~ImplType() {} \
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U_NAMESPACE_END \
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UPRV_FORMATTED_VALUE_CAPI_NO_IMPLTYPE_AUTO_IMPL(CType, ImplType, HelperType, Prefix)
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif // __FORMVAL_IMPL_H__
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