intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

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diff --git a/contrib/libs/icu/i18n/formattedval_impl.h b/contrib/libs/icu/i18n/formattedval_impl.h
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+++ b/contrib/libs/icu/i18n/formattedval_impl.h
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+// © 2018 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#ifndef __FORMVAL_IMPL_H__
+#define __FORMVAL_IMPL_H__
+
+#include "unicode/utypes.h"
+#if !UCONFIG_NO_FORMATTING
+
+// This file contains compliant implementations of FormattedValue which can be
+// leveraged by ICU formatters.
+//
+// Each implementation is defined in its own cpp file in order to split
+// dependencies more modularly.
+
+#include "unicode/formattedvalue.h"
+#include "capi_helper.h"
+#include "fphdlimp.h"
+#include "util.h"
+#include "uvectr32.h"
+#include "formatted_string_builder.h"
+
+
+/**
+ * Represents the type of constraint for ConstrainedFieldPosition.
+ *
+ * Constraints are used to control the behavior of iteration in FormattedValue.
+ *
+ * @internal
+ */
+typedef enum UCFPosConstraintType {
+    /**
+     * Represents the lack of a constraint.
+     *
+     * This is the value of fConstraint if no "constrain" methods were called.
+     *
+     * @internal
+     */
+    UCFPOS_CONSTRAINT_NONE = 0,
+
+    /**
+     * Represents that the field category is constrained.
+     *
+     * This is the value of fConstraint if constraintCategory was called.
+     *
+     * FormattedValue implementations should not change the field category
+     * while this constraint is active.
+     *
+     * @internal
+     */
+    UCFPOS_CONSTRAINT_CATEGORY,
+
+    /**
+     * Represents that the field and field category are constrained.
+     *
+     * This is the value of fConstraint if constraintField was called.
+     *
+     * FormattedValue implementations should not change the field or field category
+     * while this constraint is active.
+     *
+     * @internal
+     */
+    UCFPOS_CONSTRAINT_FIELD
+} UCFPosConstraintType;
+
+
+U_NAMESPACE_BEGIN
+
+
+/**
+ * Implementation of FormattedValue using FieldPositionHandler to accept fields.
+ */
+class FormattedValueFieldPositionIteratorImpl : public UMemory, public FormattedValue {
+public:
+
+    /** @param initialFieldCapacity Initially allocate space for this many fields. */
+    FormattedValueFieldPositionIteratorImpl(int32_t initialFieldCapacity, UErrorCode& status);
+
+    virtual ~FormattedValueFieldPositionIteratorImpl();
+
+    // Implementation of FormattedValue (const):
+
+    UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
+    UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
+    Appendable& appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
+    UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
+
+    // Additional methods used during construction phase only (non-const):
+
+    FieldPositionIteratorHandler getHandler(UErrorCode& status);
+    void appendString(UnicodeString string, UErrorCode& status);
+
+    /**
+     * Computes the spans for duplicated values.
+     * For example, if the string has fields:
+     * 
+     *     ...aa..[b.cc]..d.[bb.e.c]..a..
+     *
+     * then the spans will be the bracketed regions.
+     *
+     * Assumes that the currently known fields are sorted
+     * and all in the same category.
+     */
+    void addOverlapSpans(UFieldCategory spanCategory, int8_t firstIndex, UErrorCode& status);
+
+    /**
+     * Sorts the fields: start index first, length second.
+     */
+    void sort();
+
+private:
+    UnicodeString fString;
+    UVector32 fFields;
+};
+
+
+/**
+ * Implementation of FormattedValue based on FormattedStringBuilder.
+ *
+ * The implementation currently revolves around numbers and number fields.
+ * However, it can be generalized in the future when there is a need.
+ *
+ * @author sffc (Shane Carr)
+ */
+// Exported as U_I18N_API for tests
+class U_I18N_API FormattedValueStringBuilderImpl : public UMemory, public FormattedValue {
+public:
+
+    FormattedValueStringBuilderImpl(FormattedStringBuilder::Field numericField);
+
+    virtual ~FormattedValueStringBuilderImpl();
+
+    // Implementation of FormattedValue (const):
+
+    UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
+    UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
+    Appendable& appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
+    UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
+
+    // Additional helper functions:
+    UBool nextFieldPosition(FieldPosition& fp, UErrorCode& status) const;
+    void getAllFieldPositions(FieldPositionIteratorHandler& fpih, UErrorCode& status) const;
+    inline FormattedStringBuilder& getStringRef() {
+        return fString;
+    }
+    inline const FormattedStringBuilder& getStringRef() const {
+        return fString;
+    }
+
+private:
+    FormattedStringBuilder fString;
+    FormattedStringBuilder::Field fNumericField;
+
+    bool nextPositionImpl(ConstrainedFieldPosition& cfpos, FormattedStringBuilder::Field numericField, UErrorCode& status) const;
+    static bool isIntOrGroup(FormattedStringBuilder::Field field);
+    int32_t trimBack(int32_t limit) const;
+    int32_t trimFront(int32_t start) const;
+};
+
+
+// C API Helpers for FormattedValue
+// Magic number as ASCII == "UFV"
+struct UFormattedValueImpl;
+typedef IcuCApiHelper<UFormattedValue, UFormattedValueImpl, 0x55465600> UFormattedValueApiHelper;
+struct UFormattedValueImpl : public UMemory, public UFormattedValueApiHelper {
+    // This pointer should be set by the child class.
+    FormattedValue* fFormattedValue = nullptr;
+};
+
+
+/** Boilerplate to check for valid status before dereferencing the fData pointer. */
+#define UPRV_FORMATTED_VALUE_METHOD_GUARD(returnExpression) \
+    if (U_FAILURE(status)) { \
+        return returnExpression; \
+    } \
+    if (fData == nullptr) { \
+        status = fErrorCode; \
+        return returnExpression; \
+    } \
+
+
+/** Implementation of the methods from U_FORMATTED_VALUE_SUBCLASS_AUTO. */
+#define UPRV_FORMATTED_VALUE_SUBCLASS_AUTO_IMPL(Name) \
+    Name::Name(Name&& src) U_NOEXCEPT \
+            : fData(src.fData), fErrorCode(src.fErrorCode) { \
+        src.fData = nullptr; \
+        src.fErrorCode = U_INVALID_STATE_ERROR; \
+    } \
+    Name::~Name() { \
+        delete fData; \
+        fData = nullptr; \
+    } \
+    Name& Name::operator=(Name&& src) U_NOEXCEPT { \
+        delete fData; \
+        fData = src.fData; \
+        src.fData = nullptr; \
+        fErrorCode = src.fErrorCode; \
+        src.fErrorCode = U_INVALID_STATE_ERROR; \
+        return *this; \
+    } \
+    UnicodeString Name::toString(UErrorCode& status) const { \
+        UPRV_FORMATTED_VALUE_METHOD_GUARD(ICU_Utility::makeBogusString()) \
+        return fData->toString(status); \
+    } \
+    UnicodeString Name::toTempString(UErrorCode& status) const { \
+        UPRV_FORMATTED_VALUE_METHOD_GUARD(ICU_Utility::makeBogusString()) \
+        return fData->toTempString(status); \
+    } \
+    Appendable& Name::appendTo(Appendable& appendable, UErrorCode& status) const { \
+        UPRV_FORMATTED_VALUE_METHOD_GUARD(appendable) \
+        return fData->appendTo(appendable, status); \
+    } \
+    UBool Name::nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const { \
+        UPRV_FORMATTED_VALUE_METHOD_GUARD(FALSE) \
+        return fData->nextPosition(cfpos, status); \
+    }
+
+
+/** Like UPRV_FORMATTED_VALUE_CAPI_AUTO_IMPL but without impl type declarations. */
+#define UPRV_FORMATTED_VALUE_CAPI_NO_IMPLTYPE_AUTO_IMPL(CType, ImplType, HelperType, Prefix) \
+    U_CAPI CType* U_EXPORT2 \
+    Prefix ## _openResult (UErrorCode* ec) { \
+        if (U_FAILURE(*ec)) { \
+            return nullptr; \
+        } \
+        ImplType* impl = new ImplType(); \
+        if (impl == nullptr) { \
+            *ec = U_MEMORY_ALLOCATION_ERROR; \
+            return nullptr; \
+        } \
+        return static_cast<HelperType*>(impl)->exportForC(); \
+    } \
+    U_DRAFT const UFormattedValue* U_EXPORT2 \
+    Prefix ## _resultAsValue (const CType* uresult, UErrorCode* ec) { \
+        const ImplType* result = HelperType::validate(uresult, *ec); \
+        if (U_FAILURE(*ec)) { return nullptr; } \
+        return static_cast<const UFormattedValueApiHelper*>(result)->exportConstForC(); \
+    } \
+    U_CAPI void U_EXPORT2 \
+    Prefix ## _closeResult (CType* uresult) { \
+        UErrorCode localStatus = U_ZERO_ERROR; \
+        const ImplType* impl = HelperType::validate(uresult, localStatus); \
+        delete impl; \
+    }
+
+
+/**
+ * Implementation of the standard methods for a UFormattedValue "subclass" C API.
+ * @param CPPType The public C++ type, like FormattedList
+ * @param CType The public C type, like UFormattedList
+ * @param ImplType A name to use for the implementation class
+ * @param HelperType A name to use for the "mixin" typedef for C API conversion
+ * @param Prefix The C API prefix, like ulistfmt
+ * @param MagicNumber A unique 32-bit number to use to identify this type
+ */
+#define UPRV_FORMATTED_VALUE_CAPI_AUTO_IMPL(CPPType, CType, ImplType, HelperType, Prefix, MagicNumber) \
+    U_NAMESPACE_BEGIN \
+    class ImplType; \
+    typedef IcuCApiHelper<CType, ImplType, MagicNumber> HelperType; \
+    class ImplType : public UFormattedValueImpl, public HelperType { \
+    public: \
+        ImplType(); \
+        ~ImplType(); \
+        CPPType fImpl; \
+    }; \
+    ImplType::ImplType() { \
+        fFormattedValue = &fImpl; \
+    } \
+    ImplType::~ImplType() {} \
+    U_NAMESPACE_END \
+    UPRV_FORMATTED_VALUE_CAPI_NO_IMPLTYPE_AUTO_IMPL(CType, ImplType, HelperType, Prefix)
+
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif // __FORMVAL_IMPL_H__