281 lines
11 KiB
C
281 lines
11 KiB
C
/*
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********************************************************************************
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* Copyright (C) 2013-2014, International Business Machines Corporation and others.
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* All Rights Reserved.
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********************************************************************************
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*
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* File UFORMATTABLE.H
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*
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* Modification History:
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*
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* Date Name Description
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* 2013 Jun 7 srl New
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********************************************************************************
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*/
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/**
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* \file
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* \brief C API: UFormattable is a thin wrapper for primitive types used for formatting and parsing.
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*
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* This is a C interface to the icu::Formattable class. Static functions on this class convert
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* to and from this interface (via reinterpret_cast). Note that Formattables (and thus UFormattables)
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* are mutable, and many operations (even getters) may actually modify the internal state. For this
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* reason, UFormattables are not thread safe, and should not be shared between threads.
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*
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* See {@link unum_parseToUFormattable} for example code.
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*/
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#ifndef UFORMATTABLE_H
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#define UFORMATTABLE_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/localpointer.h"
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/**
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* Enum designating the type of a UFormattable instance.
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* Practically, this indicates which of the getters would return without conversion
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* or error.
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* @see icu::Formattable::Type
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* @stable ICU 52
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*/
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typedef enum UFormattableType {
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UFMT_DATE = 0, /**< ufmt_getDate() will return without conversion. @see ufmt_getDate*/
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UFMT_DOUBLE, /**< ufmt_getDouble() will return without conversion. @see ufmt_getDouble*/
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UFMT_LONG, /**< ufmt_getLong() will return without conversion. @see ufmt_getLong */
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UFMT_STRING, /**< ufmt_getUChars() will return without conversion. @see ufmt_getUChars*/
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UFMT_ARRAY, /**< ufmt_countArray() and ufmt_getArray() will return the value. @see ufmt_getArrayItemByIndex */
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UFMT_INT64, /**< ufmt_getInt64() will return without conversion. @see ufmt_getInt64 */
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UFMT_OBJECT, /**< ufmt_getObject() will return without conversion. @see ufmt_getObject*/
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UFMT_COUNT /**< Count of defined UFormattableType values */
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} UFormattableType;
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/**
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* Opaque type representing various types of data which may be used for formatting
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* and parsing operations.
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* @see icu::Formattable
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* @stable ICU 52
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*/
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typedef void *UFormattable;
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/**
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* Initialize a UFormattable, to type UNUM_LONG, value 0
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* may return error if memory allocation failed.
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* parameter status error code.
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* See {@link unum_parseToUFormattable} for example code.
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* @stable ICU 52
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* @return the new UFormattable
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* @see ufmt_close
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* @see icu::Formattable::Formattable()
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*/
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U_STABLE UFormattable* U_EXPORT2
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ufmt_open(UErrorCode* status);
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/**
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* Cleanup any additional memory allocated by this UFormattable.
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* @param fmt the formatter
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* @stable ICU 52
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* @see ufmt_open
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*/
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U_STABLE void U_EXPORT2
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ufmt_close(UFormattable* fmt);
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#if U_SHOW_CPLUSPLUS_API
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U_NAMESPACE_BEGIN
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/**
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* \class LocalUFormattablePointer
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* "Smart pointer" class, closes a UFormattable via ufmt_close().
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* For most methods see the LocalPointerBase base class.
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*
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* @see LocalPointerBase
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* @see LocalPointer
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* @stable ICU 52
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*/
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U_DEFINE_LOCAL_OPEN_POINTER(LocalUFormattablePointer, UFormattable, ufmt_close);
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U_NAMESPACE_END
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#endif
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/**
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* Return the type of this object
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* @param fmt the UFormattable object
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* @param status status code - U_ILLEGAL_ARGUMENT_ERROR is returned if the UFormattable contains data not supported by
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* the API
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* @return the value as a UFormattableType
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* @see ufmt_isNumeric
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* @see icu::Formattable::getType() const
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* @stable ICU 52
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*/
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U_STABLE UFormattableType U_EXPORT2
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ufmt_getType(const UFormattable* fmt, UErrorCode *status);
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/**
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* Return whether the object is numeric.
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* @param fmt the UFormattable object
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* @return true if the object is a double, long, or int64 value, else false.
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* @see ufmt_getType
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* @see icu::Formattable::isNumeric() const
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* @stable ICU 52
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*/
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U_STABLE UBool U_EXPORT2
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ufmt_isNumeric(const UFormattable* fmt);
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/**
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* Gets the UDate value of this object. If the type is not of type UFMT_DATE,
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* status is set to U_INVALID_FORMAT_ERROR and the return value is
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* undefined.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @return the value
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* @stable ICU 52
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* @see icu::Formattable::getDate(UErrorCode&) const
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*/
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U_STABLE UDate U_EXPORT2
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ufmt_getDate(const UFormattable* fmt, UErrorCode *status);
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/**
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* Gets the double value of this object. If the type is not a UFMT_DOUBLE, or
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* if there are additional significant digits than fit in a double type,
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* a conversion is performed with possible loss of precision.
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* If the type is UFMT_OBJECT and the
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* object is a Measure, then the result of
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* getNumber().getDouble(status) is returned. If this object is
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* neither a numeric type nor a Measure, then 0 is returned and
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* the status is set to U_INVALID_FORMAT_ERROR.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @return the value
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* @stable ICU 52
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* @see icu::Formattable::getDouble(UErrorCode&) const
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*/
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U_STABLE double U_EXPORT2
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ufmt_getDouble(UFormattable* fmt, UErrorCode *status);
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/**
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* Gets the long (int32_t) value of this object. If the magnitude is too
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* large to fit in a long, then the maximum or minimum long value,
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* as appropriate, is returned and the status is set to
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* U_INVALID_FORMAT_ERROR. If this object is of type UFMT_INT64 and
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* it fits within a long, then no precision is lost. If it is of
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* type kDouble or kDecimalNumber, then a conversion is peformed, with
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* truncation of any fractional part. If the type is UFMT_OBJECT and
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* the object is a Measure, then the result of
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* getNumber().getLong(status) is returned. If this object is
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* neither a numeric type nor a Measure, then 0 is returned and
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* the status is set to U_INVALID_FORMAT_ERROR.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @return the value
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* @stable ICU 52
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* @see icu::Formattable::getLong(UErrorCode&) const
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*/
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U_STABLE int32_t U_EXPORT2
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ufmt_getLong(UFormattable* fmt, UErrorCode *status);
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/**
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* Gets the int64_t value of this object. If this object is of a numeric
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* type and the magnitude is too large to fit in an int64, then
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* the maximum or minimum int64 value, as appropriate, is returned
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* and the status is set to U_INVALID_FORMAT_ERROR. If the
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* magnitude fits in an int64, then a casting conversion is
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* peformed, with truncation of any fractional part. If the type
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* is UFMT_OBJECT and the object is a Measure, then the result of
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* getNumber().getDouble(status) is returned. If this object is
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* neither a numeric type nor a Measure, then 0 is returned and
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* the status is set to U_INVALID_FORMAT_ERROR.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @return the value
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* @stable ICU 52
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* @see icu::Formattable::getInt64(UErrorCode&) const
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*/
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U_STABLE int64_t U_EXPORT2
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ufmt_getInt64(UFormattable* fmt, UErrorCode *status);
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/**
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* Returns a pointer to the UObject contained within this
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* formattable (as a const void*), or NULL if this object
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* is not of type UFMT_OBJECT.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @return the value as a const void*. It is a polymorphic C++ object.
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* @stable ICU 52
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* @see icu::Formattable::getObject() const
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*/
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U_STABLE const void *U_EXPORT2
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ufmt_getObject(const UFormattable* fmt, UErrorCode *status);
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/**
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* Gets the string value of this object as a UChar string. If the type is not a
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* string, status is set to U_INVALID_FORMAT_ERROR and a NULL pointer is returned.
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* This function is not thread safe and may modify the UFormattable if need be to terminate the string.
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* The returned pointer is not valid if any other functions are called on this UFormattable, or if the UFormattable is closed.
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors
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* @param len if non null, contains the string length on return
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* @return the null terminated string value - must not be referenced after any other functions are called on this UFormattable.
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* @stable ICU 52
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* @see icu::Formattable::getString(UnicodeString&)const
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*/
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U_STABLE const UChar* U_EXPORT2
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ufmt_getUChars(UFormattable* fmt, int32_t *len, UErrorCode *status);
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/**
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* Get the number of array objects contained, if an array type UFMT_ARRAY
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* @param fmt the UFormattable object
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* @param status the error code - any conversion or format errors. U_ILLEGAL_ARGUMENT_ERROR if not an array type.
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* @return the number of array objects or undefined if not an array type
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* @stable ICU 52
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* @see ufmt_getArrayItemByIndex
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*/
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U_STABLE int32_t U_EXPORT2
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ufmt_getArrayLength(const UFormattable* fmt, UErrorCode *status);
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/**
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* Get the specified value from the array of UFormattables. Invalid if the object is not an array type UFMT_ARRAY
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* @param fmt the UFormattable object
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* @param n the number of the array to return (0 based).
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* @param status the error code - any conversion or format errors. Returns an error if n is out of bounds.
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* @return the nth array value, only valid while the containing UFormattable is valid. NULL if not an array.
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* @stable ICU 52
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* @see icu::Formattable::getArray(int32_t&, UErrorCode&) const
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*/
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U_STABLE UFormattable * U_EXPORT2
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ufmt_getArrayItemByIndex(UFormattable* fmt, int32_t n, UErrorCode *status);
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/**
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* Returns a numeric string representation of the number contained within this
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* formattable, or NULL if this object does not contain numeric type.
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* For values obtained by parsing, the returned decimal number retains
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* the full precision and range of the original input, unconstrained by
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* the limits of a double floating point or a 64 bit int.
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*
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* This function is not thread safe, and therfore is not declared const,
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* even though it is logically const.
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* The resulting buffer is owned by the UFormattable and is invalid if any other functions are
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* called on the UFormattable.
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*
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* Possible errors include U_MEMORY_ALLOCATION_ERROR, and
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* U_INVALID_STATE if the formattable object has not been set to
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* a numeric type.
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* @param fmt the UFormattable object
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* @param len if non-null, on exit contains the string length (not including the terminating null)
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* @param status the error code
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* @return the character buffer as a NULL terminated string, which is owned by the object and must not be accessed if any other functions are called on this object.
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* @stable ICU 52
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* @see icu::Formattable::getDecimalNumber(UErrorCode&)
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*/
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U_STABLE const char * U_EXPORT2
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ufmt_getDecNumChars(UFormattable *fmt, int32_t *len, UErrorCode *status);
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#endif
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#endif
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