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	1	// © 2016 and later: Unicode, Inc. and others.
	2	// License & terms of use: http://www.unicode.org/copyright.html
	3	/*
	4	*******************************************************************************
	5	* Copyright (C) 2009-2015, International Business Machines Corporation and *
	6	* others. All Rights Reserved. *
	7	*******************************************************************************
	8	*/
	9
	10	#ifndef FPHDLIMP_H
	11	#define FPHDLIMP_H
	12
	13	#include "unicode/utypes.h"
	14
	15	#if !UCONFIG_NO_FORMATTING
	16
	17	#include "unicode/fieldpos.h"
	18	#include "unicode/fpositer.h"
	19	#include "unicode/formattedvalue.h"
	20
	21	U_NAMESPACE_BEGIN
	22
	23	// utility FieldPositionHandler
	24	// base class, null implementation
	25
	26	class U_I18N_API FieldPositionHandler: public UMemory {
	27	protected:
	28	int32_t fShift = 0;
	29
	30	public:
	31	virtual ~FieldPositionHandler();
	32	virtual void addAttribute(int32_t id, int32_t start, int32_t limit) = 0;
	33	virtual void shiftLast(int32_t delta) = 0;
	34	virtual UBool isRecording(void) const = 0;
	35
	36	void setShift(int32_t delta);
	37	};
	38
	39
	40	// utility subclass FieldPositionOnlyHandler
	41
	42	class FieldPositionOnlyHandler : public FieldPositionHandler {
	43	FieldPosition& pos;
	44	UBool acceptFirstOnly = FALSE;
	45	UBool seenFirst = FALSE;
	46
	47	public:
	48	FieldPositionOnlyHandler(FieldPosition& pos);
	49	virtual ~FieldPositionOnlyHandler();
	50
	51	void addAttribute(int32_t id, int32_t start, int32_t limit) U_OVERRIDE;
	52	void shiftLast(int32_t delta) U_OVERRIDE;
	53	UBool isRecording(void) const U_OVERRIDE;
	54
	55	/**
	56	* Enable this option to lock in the FieldPosition value after seeing the
	57	* first occurrence of the field. The default behavior is to take the last
	58	* occurrence.
	59	*/
	60	void setAcceptFirstOnly(UBool acceptFirstOnly);
	61	};
	62
	63
	64	// utility subclass FieldPositionIteratorHandler
	65
	66	class FieldPositionIteratorHandler : public FieldPositionHandler {
	67	FieldPositionIterator* iter; // can be NULL
	68	UVector32* vec;
	69	UErrorCode status;
	70	UFieldCategory fCategory;
	71
	72	// Note, we keep a reference to status, so if status is on the stack, we have
	73	// to be destroyed before status goes out of scope. Easiest thing is to
	74	// allocate us on the stack in the same (or narrower) scope as status has.
	75	// This attempts to encourage that by blocking heap allocation.
	76	static void* U_EXPORT2 operator new(size_t) U_NOEXCEPT = delete;
	77	static void* U_EXPORT2 operator new[](size_t) U_NOEXCEPT = delete;
	78	#if U_HAVE_PLACEMENT_NEW
	79	static void* U_EXPORT2 operator new(size_t, void*) U_NOEXCEPT = delete;
	80	#endif
	81
	82	public:
	83	FieldPositionIteratorHandler(FieldPositionIterator* posIter, UErrorCode& status);
	84	/** If using this constructor, you must call getError() when done formatting! */
	85	FieldPositionIteratorHandler(UVector32* vec, UErrorCode& status);
	86	~FieldPositionIteratorHandler();
	87
	88	void addAttribute(int32_t id, int32_t start, int32_t limit) U_OVERRIDE;
	89	void shiftLast(int32_t delta) U_OVERRIDE;
	90	UBool isRecording(void) const U_OVERRIDE;
	91
	92	/** Copies a failed error code into _status. */
	93	inline void getError(UErrorCode& _status) {
	94	if (U_SUCCESS(_status) && U_FAILURE(status)) {
	95	_status = status;
	96	}
	97	}
	98
	99	inline void setCategory(UFieldCategory category) {
	100	fCategory = category;
	101	}
	102	};
	103
	104	U_NAMESPACE_END
	105
	106	#endif /* !UCONFIG_NO_FORMATTING */
	107
	108	#endif /* FPHDLIMP_H */