550 lines
21 KiB
C++
550 lines
21 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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********************************************************************************
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* Copyright (C) 2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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********************************************************************************
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*
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* File decimfmtimpl.h
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********************************************************************************
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*/
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#ifndef DECIMFMTIMPL_H
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#define DECIMFMTIMPL_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/decimfmt.h"
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#include "unicode/uobject.h"
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#include "affixpatternparser.h"
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#include "digitaffixesandpadding.h"
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#include "digitformatter.h"
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#include "digitgrouping.h"
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#include "precision.h"
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U_NAMESPACE_BEGIN
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class UnicodeString;
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class FieldPosition;
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class ValueFormatter;
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class FieldPositionHandler;
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class FixedDecimal;
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/**
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* DecimalFormatImpl is the glue code between the legacy DecimalFormat class
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* and the new decimal formatting classes. DecimalFormat still handles
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* parsing directly. However, DecimalFormat uses attributes of this class
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* for parsing when possible.
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*
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* The public API of this class closely mirrors the legacy API of the
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* legacy DecimalFormat deviating only when the legacy API does not make
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* sense. For example, although DecimalFormat has a
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* getPadCharacterString() method, DecimalFormatImpl has a getPadCharacter()
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* method because formatting uses only a single pad character for padding.
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*
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* Each legacy DecimalFormat instance heap allocates its own instance of
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* this class. Most DecimalFormat methods that deal with formatting simply
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* delegate to the DecimalFormat's DecimalFormatImpl method.
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*
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* Because DecimalFormat extends NumberFormat, Each instance of this class
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* "borrows" a pointer to the NumberFormat part of its enclosing DecimalFormat
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* instance. This way each DecimalFormatImpl instance can read or even modify
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* the NumberFormat portion of its enclosing DecimalFormat instance.
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*
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* Directed acyclic graph (DAG):
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*
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* This class can be represented as a directed acyclic graph (DAG) where each
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* vertex is an attribute, and each directed edge indicates that the value
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* of the destination attribute is calculated from the value of the source
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* attribute. Attributes with setter methods reside at the bottom of the
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* DAG. That is, no edges point to them. We call these independent attributes
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* because their values can be set independently of one another. The rest of
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* the attributes are derived attributes because their values depend on the
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* independent attributes. DecimalFormatImpl often uses the derived
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* attributes, not the independent attributes, when formatting numbers.
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*
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* The independent attributes at the bottom of the DAG correspond to the legacy
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* attributes of DecimalFormat while the attributes at the top of the DAG
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* correspond to the attributes of the new code. The edges of the DAG
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* correspond to the code that handles the complex interaction among all the
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* legacy attributes of the DecimalFormat API.
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*
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* We use a DAG for three reasons.
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*
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* First, the DAG preserves backward compatibility. Clients of the legacy
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* DecimalFormat expect existing getters and setters of each attribute to be
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* consistent. That means if a client sets a particular attribute to a new
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* value, the attribute should retain that value until the client sets it to
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* a new value. The DAG allows these attributes to remain consistent even
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* though the new code may not use them when formatting.
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*
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* Second, the DAG obviates the need to recalculate derived attributes with
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* each format. Instead, the DAG "remembers" the values of all derived
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* attributes. Only setting an independent attribute requires a recalculation.
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* Moreover, setting an independent attribute recalculates only the affected
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* dependent attributes rather than all dependent attributes.
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*
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* Third, the DAG abstracts away the complex interaction among the legacy
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* attributes of the DecimalFormat API.
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*
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* Only the independent attributes of the DAG have setters and getters.
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* Derived attributes have no setters (and often no getters either).
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*
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* Copy and assign:
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*
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* For copy and assign, DecimalFormatImpl copies and assigns every attribute
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* regardless of whether or not it is independent. We do this for simplicity.
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*
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* Implementation of the DAG:
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*
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* The DAG consists of three smaller DAGs:
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* 1. Grouping attributes
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* 2. Precision attributes
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* 3. Formatting attributes.
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*
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* The first two DAGs are simple in that setting any independent attribute
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* in the DAG recalculates all the dependent attributes in that DAG.
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* The updateGrouping() and updatePrecision() perform the respective
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* recalculations.
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*
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* Because some of the derived formatting attributes are expensive to
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* calculate, the formatting attributes DAG is more complex. The
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* updateFormatting() method is composed of many updateFormattingXXX()
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* methods, each of which recalculates a single derived attribute. The
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* updateFormatting() method accepts a bitfield of recently changed
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* attributes and passes this bitfield by reference to each of the
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* updateFormattingXXX() methods. Each updateFormattingXXX() method checks
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* the bitfield to see if any of the attributes it uses to compute the XXX
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* attribute changed. If none of them changed, it exists immediately. However,
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* if at least one of them changed, it recalculates the XXX attribute and
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* sets the corresponding bit in the bitfield. In this way, each
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* updateFormattingXXX() method encodes the directed edges in the formatting
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* DAG that point to the attribute its calculating.
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*
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* Maintenance of the updateFormatting() method.
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*
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* Use care when changing the updateFormatting() method.
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* The updateFormatting() method must call each updateFormattingXXX() in the
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* same partial order that the formatting DAG prescribes. That is, the
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* attributes near the bottom of the DAG must be calculated before attributes
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* further up. As we mentioned in the prvious paragraph, the directed edges of
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* the formatting DAG are encoded within each updateFormattingXXX() method.
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* Finally, adding new attributes may involve adding to the bitmap that the
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* updateFormatting() method uses. The top most attributes in the DAG,
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* those that do not point to any attributes but only have attributes
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* pointing to it, need not have a slot in the bitmap.
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*
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* Keep in mind that most of the code that makes the legacy DecimalFormat API
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* work the way it always has before can be found in these various updateXXX()
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* methods. For example the updatePrecisionForScientific() method
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* handles the complex interactions amoung the various precision attributes
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* when formatting in scientific notation. Changing the way attributes
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* interract, often means changing one of these updateXXX() methods.
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*
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* Conclusion:
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*
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* The DecimFmtImpl class is the glue code between the legacy and new
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* number formatting code. It uses a direct acyclic graph (DAG) to
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* maintain backward compatibility, to make the code efficient, and to
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* abstract away the complex interraction among legacy attributs.
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*/
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class DecimalFormatImpl : public UObject {
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public:
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DecimalFormatImpl(
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NumberFormat *super,
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const Locale &locale,
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const UnicodeString &pattern,
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UErrorCode &status);
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DecimalFormatImpl(
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NumberFormat *super,
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const UnicodeString &pattern,
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DecimalFormatSymbols *symbolsToAdopt,
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UParseError &parseError,
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UErrorCode &status);
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DecimalFormatImpl(
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NumberFormat *super,
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const DecimalFormatImpl &other,
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UErrorCode &status);
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DecimalFormatImpl &assign(
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const DecimalFormatImpl &other, UErrorCode &status);
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virtual ~DecimalFormatImpl();
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void adoptDecimalFormatSymbols(DecimalFormatSymbols *symbolsToAdopt);
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const DecimalFormatSymbols &getDecimalFormatSymbols() const {
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return *fSymbols;
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}
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UnicodeString &format(
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int32_t number,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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UnicodeString &format(
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int32_t number,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UnicodeString &format(
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int64_t number,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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UnicodeString &format(
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double number,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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UnicodeString &format(
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const DigitList &number,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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UnicodeString &format(
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int64_t number,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UnicodeString &format(
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double number,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UnicodeString &format(
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const DigitList &number,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UnicodeString &format(
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StringPiece number,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UnicodeString &format(
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const VisibleDigitsWithExponent &digits,
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UnicodeString &appendTo,
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FieldPosition &pos,
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UErrorCode &status) const;
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UnicodeString &format(
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const VisibleDigitsWithExponent &digits,
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UnicodeString &appendTo,
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FieldPositionIterator *posIter,
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UErrorCode &status) const;
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UBool operator==(const DecimalFormatImpl &) const;
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UBool operator!=(const DecimalFormatImpl &other) const {
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return !(*this == other);
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}
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void setRoundingMode(DecimalFormat::ERoundingMode mode) {
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fRoundingMode = mode;
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fEffPrecision.fMantissa.fExactOnly = (fRoundingMode == DecimalFormat::kRoundUnnecessary);
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fEffPrecision.fMantissa.fRoundingMode = mode;
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}
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DecimalFormat::ERoundingMode getRoundingMode() const {
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return fRoundingMode;
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}
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void setFailIfMoreThanMaxDigits(UBool b) {
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fEffPrecision.fMantissa.fFailIfOverMax = b;
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}
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UBool isFailIfMoreThanMaxDigits() const { return fEffPrecision.fMantissa.fFailIfOverMax; }
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void setMinimumSignificantDigits(int32_t newValue);
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void setMaximumSignificantDigits(int32_t newValue);
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void setMinMaxSignificantDigits(int32_t min, int32_t max);
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void setScientificNotation(UBool newValue);
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void setSignificantDigitsUsed(UBool newValue);
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int32_t getMinimumSignificantDigits() const {
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return fMinSigDigits; }
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int32_t getMaximumSignificantDigits() const {
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return fMaxSigDigits; }
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UBool isScientificNotation() const { return fUseScientific; }
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UBool areSignificantDigitsUsed() const { return fUseSigDigits; }
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void setGroupingSize(int32_t newValue);
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void setSecondaryGroupingSize(int32_t newValue);
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void setMinimumGroupingDigits(int32_t newValue);
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int32_t getGroupingSize() const { return fGrouping.fGrouping; }
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int32_t getSecondaryGroupingSize() const { return fGrouping.fGrouping2; }
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int32_t getMinimumGroupingDigits() const { return fGrouping.fMinGrouping; }
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void applyPattern(const UnicodeString &pattern, UErrorCode &status);
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void applyPatternFavorCurrencyPrecision(
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const UnicodeString &pattern, UErrorCode &status);
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void applyPattern(
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const UnicodeString &pattern, UParseError &perror, UErrorCode &status);
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void applyLocalizedPattern(const UnicodeString &pattern, UErrorCode &status);
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void applyLocalizedPattern(
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const UnicodeString &pattern, UParseError &perror, UErrorCode &status);
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void setCurrencyUsage(UCurrencyUsage usage, UErrorCode &status);
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UCurrencyUsage getCurrencyUsage() const { return fCurrencyUsage; }
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void setRoundingIncrement(double d);
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double getRoundingIncrement() const;
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int32_t getMultiplier() const;
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void setMultiplier(int32_t m);
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UChar32 getPadCharacter() const { return fAffixes.fPadChar; }
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void setPadCharacter(UChar32 c) { fAffixes.fPadChar = c; }
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int32_t getFormatWidth() const { return fAffixes.fWidth; }
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void setFormatWidth(int32_t x) { fAffixes.fWidth = x; }
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DigitAffixesAndPadding::EPadPosition getPadPosition() const {
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return fAffixes.fPadPosition;
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}
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void setPadPosition(DigitAffixesAndPadding::EPadPosition x) {
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fAffixes.fPadPosition = x;
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}
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int32_t getMinimumExponentDigits() const {
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return fEffPrecision.fMinExponentDigits;
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}
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void setMinimumExponentDigits(int32_t x) {
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fEffPrecision.fMinExponentDigits = x;
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}
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UBool isExponentSignAlwaysShown() const {
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return fOptions.fExponent.fAlwaysShowSign;
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}
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void setExponentSignAlwaysShown(UBool x) {
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fOptions.fExponent.fAlwaysShowSign = x;
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}
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UBool isDecimalSeparatorAlwaysShown() const {
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return fOptions.fMantissa.fAlwaysShowDecimal;
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}
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void setDecimalSeparatorAlwaysShown(UBool x) {
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fOptions.fMantissa.fAlwaysShowDecimal = x;
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}
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UnicodeString &getPositivePrefix(UnicodeString &result) const;
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UnicodeString &getPositiveSuffix(UnicodeString &result) const;
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UnicodeString &getNegativePrefix(UnicodeString &result) const;
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UnicodeString &getNegativeSuffix(UnicodeString &result) const;
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void setPositivePrefix(const UnicodeString &str);
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void setPositiveSuffix(const UnicodeString &str);
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void setNegativePrefix(const UnicodeString &str);
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void setNegativeSuffix(const UnicodeString &str);
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UnicodeString &toPattern(UnicodeString& result) const;
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FixedDecimal &getFixedDecimal(double value, FixedDecimal &result, UErrorCode &status) const;
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FixedDecimal &getFixedDecimal(DigitList &number, FixedDecimal &result, UErrorCode &status) const;
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DigitList &round(DigitList &number, UErrorCode &status) const;
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VisibleDigitsWithExponent &
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initVisibleDigitsWithExponent(
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int64_t number,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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VisibleDigitsWithExponent &
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initVisibleDigitsWithExponent(
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double number,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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VisibleDigitsWithExponent &
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initVisibleDigitsWithExponent(
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DigitList &number,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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void updatePrecision();
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void updateGrouping();
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void updateCurrency(UErrorCode &status);
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private:
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// Disallow copy and assign
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DecimalFormatImpl(const DecimalFormatImpl &other);
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DecimalFormatImpl &operator=(const DecimalFormatImpl &other);
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NumberFormat *fSuper;
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DigitList fMultiplier;
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int32_t fScale;
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DecimalFormat::ERoundingMode fRoundingMode;
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// These fields include what the user can see and set.
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// When the user updates these fields, it triggers automatic updates of
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// other fields that may be invisible to user
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// Updating any of the following fields triggers an update to
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// fEffPrecision.fMantissa.fMin,
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// fEffPrecision.fMantissa.fMax,
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// fEffPrecision.fMantissa.fSignificant fields
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// We have this two phase update because of backward compatibility.
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// DecimalFormat has to remember all settings even if those settings are
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// invalid or disabled.
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int32_t fMinSigDigits;
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int32_t fMaxSigDigits;
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UBool fUseScientific;
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UBool fUseSigDigits;
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// In addition to these listed above, changes to min/max int digits and
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// min/max frac digits from fSuper also trigger an update.
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// Updating any of the following fields triggers an update to
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// fEffGrouping field Again we do it this way because original
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// grouping settings have to be retained if grouping is turned off.
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DigitGrouping fGrouping;
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// In addition to these listed above, changes to isGroupingUsed in
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// fSuper also triggers an update to fEffGrouping.
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// Updating any of the following fields triggers updates on the following:
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// fMonetary, fRules, fAffixParser, fCurrencyAffixInfo,
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// fFormatter, fAffixes.fPositivePrefiix, fAffixes.fPositiveSuffix,
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// fAffixes.fNegativePrefiix, fAffixes.fNegativeSuffix
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// We do this two phase update because localizing the affix patterns
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// and formatters can be expensive. Better to do it once with the setters
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// than each time within format.
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AffixPattern fPositivePrefixPattern;
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AffixPattern fNegativePrefixPattern;
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AffixPattern fPositiveSuffixPattern;
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AffixPattern fNegativeSuffixPattern;
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DecimalFormatSymbols *fSymbols;
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UCurrencyUsage fCurrencyUsage;
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// In addition to these listed above, changes to getCurrency() in
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// fSuper also triggers an update.
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// Optional may be NULL
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PluralRules *fRules;
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// These fields are totally hidden from user and are used to derive the affixes
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// in fAffixes below from the four affix patterns above.
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UBool fMonetary;
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AffixPatternParser fAffixParser;
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CurrencyAffixInfo fCurrencyAffixInfo;
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// The actual precision used when formatting
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ScientificPrecision fEffPrecision;
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// The actual grouping used when formatting
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DigitGrouping fEffGrouping;
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SciFormatterOptions fOptions; // Encapsulates fixed precision options
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DigitFormatter fFormatter;
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DigitAffixesAndPadding fAffixes;
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UnicodeString &formatInt32(
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int32_t number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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UnicodeString &formatInt64(
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int64_t number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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UnicodeString &formatDouble(
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double number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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// Scales for precent or permille symbols
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UnicodeString &formatDigitList(
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DigitList &number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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// Does not scale for precent or permille symbols
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UnicodeString &formatAdjustedDigitList(
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DigitList &number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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UnicodeString &formatVisibleDigitsWithExponent(
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const VisibleDigitsWithExponent &number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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VisibleDigitsWithExponent &
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initVisibleDigitsFromAdjusted(
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DigitList &number,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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template<class T>
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UBool maybeFormatWithDigitList(
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T number,
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UnicodeString &appendTo,
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FieldPositionHandler &handler,
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UErrorCode &status) const;
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template<class T>
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UBool maybeInitVisibleDigitsFromDigitList(
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T number,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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DigitList &adjustDigitList(DigitList &number, UErrorCode &status) const;
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void applyPattern(
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const UnicodeString &pattern,
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UBool localized, UParseError &perror, UErrorCode &status);
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ValueFormatter &prepareValueFormatter(ValueFormatter &vf) const;
|
|
void setMultiplierScale(int32_t s);
|
|
int32_t getPatternScale() const;
|
|
void setScale(int32_t s) { fScale = s; }
|
|
int32_t getScale() const { return fScale; }
|
|
|
|
// Updates everything
|
|
void updateAll(UErrorCode &status);
|
|
void updateAll(
|
|
int32_t formattingFlags,
|
|
UBool updatePrecisionBasedOnCurrency,
|
|
UErrorCode &status);
|
|
|
|
// Updates from formatting pattern changes
|
|
void updateForApplyPattern(UErrorCode &status);
|
|
void updateForApplyPatternFavorCurrencyPrecision(UErrorCode &status);
|
|
|
|
// Updates from changes to third group of attributes
|
|
void updateFormatting(int32_t changedFormattingFields, UErrorCode &status);
|
|
void updateFormatting(
|
|
int32_t changedFormattingFields,
|
|
UBool updatePrecisionBasedOnCurrency,
|
|
UErrorCode &status);
|
|
|
|
// Helper functions for updatePrecision
|
|
void updatePrecisionForScientific();
|
|
void updatePrecisionForFixed();
|
|
void extractMinMaxDigits(DigitInterval &min, DigitInterval &max) const;
|
|
void extractSigDigits(SignificantDigitInterval &sig) const;
|
|
|
|
// Helper functions for updateFormatting
|
|
void updateFormattingUsesCurrency(int32_t &changedFormattingFields);
|
|
void updateFormattingPluralRules(
|
|
int32_t &changedFormattingFields, UErrorCode &status);
|
|
void updateFormattingAffixParser(int32_t &changedFormattingFields);
|
|
void updateFormattingCurrencyAffixInfo(
|
|
int32_t &changedFormattingFields,
|
|
UBool updatePrecisionBasedOnCurrency,
|
|
UErrorCode &status);
|
|
void updateFormattingFixedPointFormatter(
|
|
int32_t &changedFormattingFields);
|
|
void updateFormattingLocalizedPositivePrefix(
|
|
int32_t &changedFormattingFields, UErrorCode &status);
|
|
void updateFormattingLocalizedPositiveSuffix(
|
|
int32_t &changedFormattingFields, UErrorCode &status);
|
|
void updateFormattingLocalizedNegativePrefix(
|
|
int32_t &changedFormattingFields, UErrorCode &status);
|
|
void updateFormattingLocalizedNegativeSuffix(
|
|
int32_t &changedFormattingFields, UErrorCode &status);
|
|
|
|
int32_t computeExponentPatternLength() const;
|
|
int32_t countFractionDigitAndDecimalPatternLength(int32_t fracDigitCount) const;
|
|
UnicodeString &toNumberPattern(
|
|
UBool hasPadding, int32_t minimumLength, UnicodeString& result) const;
|
|
|
|
int32_t getOldFormatWidth() const;
|
|
const UnicodeString &getConstSymbol(
|
|
DecimalFormatSymbols::ENumberFormatSymbol symbol) const;
|
|
UBool isParseFastpath() const;
|
|
|
|
friend class DecimalFormat;
|
|
|
|
};
|
|
|
|
|
|
U_NAMESPACE_END
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
#endif // DECIMFMTIMPL_H
|
|
//eof
|