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267 lines
10 KiB
C++
267 lines
10 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 1997-2007, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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* file name: nfsubs.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* Modification history
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* Date Name Comments
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* 10/11/2001 Doug Ported from ICU4J
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*/
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#ifndef NFSUBS_H
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#define NFSUBS_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "nfrule.h"
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#if U_HAVE_RBNF
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#include "unicode/utypes.h"
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#include "unicode/decimfmt.h"
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#include "nfrs.h"
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#include <float.h>
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U_NAMESPACE_BEGIN
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class NFSubstitution : public UObject {
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int32_t pos;
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const NFRuleSet* ruleSet;
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const DecimalFormat* numberFormat;
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protected:
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NFSubstitution(int32_t pos,
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const NFRuleSet* ruleSet,
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const RuleBasedNumberFormat* rbnf,
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const UnicodeString& description,
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UErrorCode& status);
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/**
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* Get the Ruleset of the object.
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* @return the Ruleset of the object.
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*/
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const NFRuleSet* getRuleSet() const { return ruleSet; }
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/**
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* get the NumberFormat of this object.
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* @return the numberformat of this object.
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*/
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const DecimalFormat* getNumberFormat() const { return numberFormat; }
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public:
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static NFSubstitution* makeSubstitution(int32_t pos,
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const NFRule* rule,
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const NFRule* predecessor,
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const NFRuleSet* ruleSet,
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const RuleBasedNumberFormat* rbnf,
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const UnicodeString& description,
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UErrorCode& status);
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/**
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* Destructor.
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*/
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virtual ~NFSubstitution();
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/**
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* Return true if the given Format objects are semantically equal.
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* Objects of different subclasses are considered unequal.
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* @param rhs the object to be compared with.
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* @return true if the given Format objects are semantically equal.
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*/
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virtual UBool operator==(const NFSubstitution& rhs) const;
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/**
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* Return true if the given Format objects are semantically unequal.
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* Objects of different subclasses are considered unequal.
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* @param rhs the object to be compared with.
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* @return true if the given Format objects are semantically unequal.
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*/
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UBool operator!=(const NFSubstitution& rhs) const { return !operator==(rhs); }
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/**
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* Sets the substitution's divisor. Used by NFRule.setBaseValue().
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* A no-op for all substitutions except multiplier and modulus
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* substitutions.
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* @param radix The radix of the divisor
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* @param exponent The exponent of the divisor
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*/
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virtual void setDivisor(int32_t radix, int32_t exponent, UErrorCode& status);
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/**
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* Replaces result with the string describing the substitution.
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* @param result Output param which will receive the string.
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*/
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virtual void toString(UnicodeString& result) const;
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//-----------------------------------------------------------------------
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// formatting
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//-----------------------------------------------------------------------
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/**
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* Performs a mathematical operation on the number, formats it using
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* either ruleSet or decimalFormat, and inserts the result into
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* toInsertInto.
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* @param number The number being formatted.
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* @param toInsertInto The string we insert the result into
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* @param pos The position in toInsertInto where the owning rule's
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* rule text begins (this value is added to this substitution's
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* position to determine exactly where to insert the new text)
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*/
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virtual void doSubstitution(int64_t number, UnicodeString& toInsertInto, int32_t pos) const;
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/**
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* Performs a mathematical operation on the number, formats it using
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* either ruleSet or decimalFormat, and inserts the result into
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* toInsertInto.
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* @param number The number being formatted.
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* @param toInsertInto The string we insert the result into
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* @param pos The position in toInsertInto where the owning rule's
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* rule text begins (this value is added to this substitution's
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* position to determine exactly where to insert the new text)
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*/
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virtual void doSubstitution(double number, UnicodeString& toInsertInto, int32_t pos) const;
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protected:
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/**
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* Subclasses override this function to perform some kind of
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* mathematical operation on the number. The result of this operation
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* is formatted using the rule set or DecimalFormat that this
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* substitution refers to, and the result is inserted into the result
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* string.
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* @param The number being formatted
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* @return The result of performing the opreration on the number
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*/
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virtual int64_t transformNumber(int64_t number) const = 0;
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/**
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* Subclasses override this function to perform some kind of
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* mathematical operation on the number. The result of this operation
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* is formatted using the rule set or DecimalFormat that this
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* substitution refers to, and the result is inserted into the result
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* string.
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* @param The number being formatted
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* @return The result of performing the opreration on the number
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*/
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virtual double transformNumber(double number) const = 0;
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public:
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//-----------------------------------------------------------------------
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// parsing
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//-----------------------------------------------------------------------
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/**
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* Parses a string using the rule set or DecimalFormat belonging
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* to this substitution. If there's a match, a mathematical
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* operation (the inverse of the one used in formatting) is
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* performed on the result of the parse and the value passed in
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* and returned as the result. The parse position is updated to
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* point to the first unmatched character in the string.
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* @param text The string to parse
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* @param parsePosition On entry, ignored, but assumed to be 0.
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* On exit, this is updated to point to the first unmatched
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* character (or 0 if the substitution didn't match)
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* @param baseValue A partial parse result that should be
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* combined with the result of this parse
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* @param upperBound When searching the rule set for a rule
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* matching the string passed in, only rules with base values
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* lower than this are considered
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* @param lenientParse If true and matching against rules fails,
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* the substitution will also try matching the text against
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* numerals using a default-costructed NumberFormat. If false,
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* no extra work is done. (This value is false whenever the
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* formatter isn't in lenient-parse mode, but is also false
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* under some conditions even when the formatter _is_ in
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* lenient-parse mode.)
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* @return If there's a match, this is the result of composing
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* baseValue with whatever was returned from matching the
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* characters. This will be either a Long or a Double. If there's
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* no match this is new Long(0) (not null), and parsePosition
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* is left unchanged.
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*/
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virtual UBool doParse(const UnicodeString& text,
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ParsePosition& parsePosition,
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double baseValue,
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double upperBound,
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UBool lenientParse,
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Formattable& result) const;
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/**
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* Derives a new value from the two values passed in. The two values
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* are typically either the base values of two rules (the one containing
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* the substitution and the one matching the substitution) or partial
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* parse results derived in some other way. The operation is generally
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* the inverse of the operation performed by transformNumber().
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* @param newRuleValue The value produced by matching this substitution
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* @param oldRuleValue The value that was passed to the substitution
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* by the rule that owns it
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* @return A third value derived from the other two, representing a
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* partial parse result
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*/
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virtual double composeRuleValue(double newRuleValue, double oldRuleValue) const = 0;
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/**
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* Calculates an upper bound when searching for a rule that matches
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* this substitution. Rules with base values greater than or equal
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* to upperBound are not considered.
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* @param oldUpperBound The current upper-bound setting. The new
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* upper bound can't be any higher.
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* @return the upper bound when searching for a rule that matches
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* this substitution.
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*/
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virtual double calcUpperBound(double oldUpperBound) const = 0;
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//-----------------------------------------------------------------------
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// simple accessors
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//-----------------------------------------------------------------------
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/**
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* Returns the substitution's position in the rule that owns it.
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* @return The substitution's position in the rule that owns it.
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*/
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int32_t getPos() const { return pos; }
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/**
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* Returns the character used in the textual representation of
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* substitutions of this type. Used by toString().
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* @return This substitution's token character.
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*/
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virtual UChar tokenChar() const = 0;
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/**
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* Returns true if this is a null substitution. (We didn't do this
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* with instanceof partially because it causes source files to
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* proliferate and partially because we have to port this to C++.)
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* @return true if this object is an instance of NullSubstitution
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*/
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virtual UBool isNullSubstitution() const;
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/**
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* Returns true if this is a modulus substitution. (We didn't do this
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* with instanceof partially because it causes source files to
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* proliferate and partially because we have to port this to C++.)
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* @return true if this object is an instance of ModulusSubstitution
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*/
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virtual UBool isModulusSubstitution() const;
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private:
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NFSubstitution(const NFSubstitution &other); // forbid copying of this class
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NFSubstitution &operator=(const NFSubstitution &other); // forbid copying of this class
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public:
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static UClassID getStaticClassID(void);
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virtual UClassID getDynamicClassID(void) const;
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};
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U_NAMESPACE_END
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/* U_HAVE_RBNF */
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#endif
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// NFSUBS_H
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#endif
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