141 lines
4.1 KiB
C++
141 lines
4.1 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2002, International Business Machines Corporation
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* and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 01/21/2002 aliu Creation.
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**********************************************************************
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*/
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#ifndef STRREPL_H
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#define STRREPL_H
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#include "unicode/unifunct.h"
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#include "unicode/unirepl.h"
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#include "unicode/unistr.h"
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U_NAMESPACE_BEGIN
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class TransliterationRuleData;
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/**
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* A replacer that produces static text as its output. The text may
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* contain transliterator stand-in characters that represent nested
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* UnicodeReplacer objects, making it possible to encode a tree of
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* replacers in a StringReplacer. A StringReplacer that contains such
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* stand-ins is called a <em>complex</em> StringReplacer. A complex
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* StringReplacer has a slower processing loop than a non-complex one.
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* @author Alan Liu
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*/
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class StringReplacer : public UnicodeFunctor, public UnicodeReplacer {
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private:
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/**
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* Output text, possibly containing stand-in characters that
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* represent nested UnicodeReplacers.
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*/
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UnicodeString output;
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/**
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* Cursor position. Value is ignored if hasCursor is false.
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*/
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int32_t cursorPos;
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/**
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* True if this object outputs a cursor position.
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*/
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UBool hasCursor;
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/**
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* A complex object contains nested replacers and requires more
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* complex processing. StringReplacers are initially assumed to
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* be complex. If no nested replacers are seen during processing,
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* then isComplex is set to false, and future replacements are
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* short circuited for better performance.
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*/
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UBool isComplex;
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/**
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* Object that translates stand-in characters in 'output' to
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* UnicodeReplacer objects.
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*/
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const TransliterationRuleData* data;
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public:
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/**
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* Construct a StringReplacer that sets the emits the given output
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* text and sets the cursor to the given position.
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* @param theOutput text that will replace input text when the
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* replace() method is called. May contain stand-in characters
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* that represent nested replacers.
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* @param theCursorPos cursor position that will be returned by
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* the replace() method
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* @param theData transliterator context object that translates
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* stand-in characters to UnicodeReplacer objects
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*/
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StringReplacer(const UnicodeString& theOutput,
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int32_t theCursorPos,
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const TransliterationRuleData* theData);
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/**
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* Construct a StringReplacer that sets the emits the given output
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* text and does not modify the cursor.
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* @param theOutput text that will replace input text when the
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* replace() method is called. May contain stand-in characters
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* that represent nested replacers.
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* @param theData transliterator context object that translates
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* stand-in characters to UnicodeReplacer objects
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*/
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StringReplacer(const UnicodeString& theOutput,
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const TransliterationRuleData* theData);
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/**
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* Copy constructor.
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*/
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StringReplacer(const StringReplacer& other);
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/**
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* Destructor
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*/
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virtual ~StringReplacer();
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/**
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* Implement UnicodeFunctor
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*/
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virtual UnicodeFunctor* clone() const;
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/**
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* UnicodeFunctor API. Cast 'this' to a UnicodeReplacer* pointer
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* and return the pointer.
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*/
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virtual UnicodeReplacer* toReplacer() const;
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/**
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* UnicodeReplacer API
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*/
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virtual int32_t replace(Replaceable& text,
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int32_t start,
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int32_t limit,
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int32_t& cursor);
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/**
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* UnicodeReplacer API
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*/
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virtual UnicodeString& toReplacerPattern(UnicodeString& result,
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UBool escapeUnprintable) const;
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/**
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* UnicodeFunctor API
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*/
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virtual void setData(const TransliterationRuleData*);
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};
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U_NAMESPACE_END
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#endif
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//eof
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