Description:

Implements a Formatter according to the formatting standards of the Java language .

Note: Inherited, public fields of parent class FormatterStdImpl provide important possibilities for changing the formatting behavior of instances of this class. Therefore, do not forget to consult the parent classes documentation.

In general, the original specification is covered quite well. The differences and specialties are:

In deviation of the Java specification, after creation, a formatter in this implementation does not produce locale aware output. Instead, number formatting is set to "computational", hence the decimal point separator is '.' and the grouping character ','. As the syntax specification does not provide a feature to switch between standard and locale setting, the corresponding fields of AlternativeNumberFormat are not used with this formatter. Instead, to enable localized output, method NumberFormat::SetFromLocale has to be invoked on field FormatterStdImpl::DefaultNumberFormat . Alternatively, attributes of this object may be changed manually or by other means to reflect a desired locale.
Hexadecimal floating point output (conversion type 'a' and 'A') is not supported.
Flag '(', used to write negative numbers in round brackets, is not supported.
Addressing the previous argument index using '%<' is already allowed with the first placeholder. This Chooses the first argument. (In Java a MissingFormatArgumentException would be thrown.)
Flag '^' is an extension to the standard and denotes center-alignment - just like '-' in the standard denotes left-alignment. Right-alignment is the default.

Floating point values:
- If standard field type 's' is given together with a precision, the field is cut, even if it cuts the number somewhere. (This is just a warning and same behavior as in original specification.)
- For lower case floating point format types ('f', 'g' and 'e'), the values specified in attributes ExponentSeparator, NANLiteral and INFLiteral of object FormatterStdImpl::AlternativeNumberFormat are used. For upper case types ('G' and 'E'), the corresponding attributes in FormatterStdImpl::DefaultNumberFormat apply.
- Fixed point format ('f' ) is not supported to use arbitrary length. See class NumberFormat for the limits. Due to this limitation, the default number of fractional digits is not set with type 'f', while in Java it is set to 6. This is to allow higher numbers up to 1.e13 to be printed in non-scientific format
- When both, a width and a precision is given, then the precision determines the fractional part, even if the type is 'g' or 'G'. This is different than specified with Java formatter, which uses precision as the overall width in case of types 'g' or 'G'.

Hexadecimal and Octal Numbers:
- Hexadecimal and octal output is cut in size (!) when a field width is given that is smaller than the resulting amount of digits of the number arguments provided.
  Note
  This implies that a value written might not be equal to the value given. This is not a bug but a design decision. The rationale behind this is that with this behavior, there is no need to mask lower digits when passing the arguments to the format invocation. In other words, the formatter "assumes" that the given field width indicates that only a corresponding number of lower digits are of interest.
- If no width is given and the argument contains a boxed pointer, then the platform-dependent full output width of pointer types is used.
- The number grouping option (',') can also be used with binary, hexadecimal and octal output. The types support different grouping separators for nibbles, bytes, 16-bit and 32-bit words. Changing the separator symbols, is not possible with the format fields of the format strings (if it was, this would become very incompatible to Java standards). Changes have to be made prior to the format operation by modifying field FormatterStdImpl::AlternativeNumberFormat which is provided through parent class FormatterStdImpl.
- Alternative form ('#') adds prefixes as specified in members
  - HexLiteralPrefix and
  - OctLiteralPrefix .
  For upper case formats, those are taken from field FormatterStdImpl::DefaultNumberFormat , for lower case formats from FormatterStdImpl::AlternativeNumberFormat . All defaults may be changed by the user.

Time and Date:
- In this C++ version of the class, boxed values of type DateTime are applicable to conversion type 't'.
- The following time conversion suffix characters are supported: 'H', 'k', 'I', 'l', 'M', 'S', 'B', 'b', 'h', 'A', 'a', 'Y', 'y', 'm', 'd', 'e', 'R', 'T', 'D' and 'F'
- The following time conversion suffix characters are not supported: 'L', 'N', 'p', 'z', 'Z', 's', 'Q', 'C', 'j', 'r' and 'c'.

Reference Documentation

Exceptions

<b>alib::lang::format::FMTExceptions</b>

Definition at line 125 of file formatterjavastyle.hpp.

#include <formatterjavastyle.hpp>

Inheritance diagram for FormatterJavaStyle:

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Collaboration diagram for FormatterJavaStyle:

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Inner Type Index:
struct	PlaceholderAttributesJS

Public Method Index:
ALIB_API	FormatterJavaStyle ()

virtual ALIB_API FormatterStdImpl *	Clone () override

Public Method Index: inherited from FormatterStdImpl
	FormatterStdImpl (const String &formatterClassName)

Public Method Index: inherited from Formatter
virtual	~Formatter ()

ALIB_API Boxes &	Acquire (const NCString &dbgFile, int dbgLine, const NCString &dbgFunc)

virtual ALIB_API void	CloneSettings (Formatter &reference)

int	CountAcquirements () const

template<typename... TArgs>
Formatter &	Format (AString &target, TArgs &&... args)
	ALIB_THREADS.

ALIB_API Formatter &	FormatArgs (AString &target)

Formatter &	FormatArgs (AString &target, const Boxes &args)

ALIB_API void	Release ()
	defined(ALIB_DOX)

ALIB_API void	ReplaceDefault (Formatter *newFormatter)

Public Method Index: inherited from ThreadLock
ALIB_API	ThreadLock (lang::Safeness safeness=lang::Safeness::Safe)

ALIB_API	~ThreadLock ()

ALIB_API void	Acquire (const NCString &dbgFile, int dbgLine, const NCString &dbgFunc)

int	CountAcquirements () const

Thread *	GetOwner () const

lang::Safeness	GetSafeness () const

bool	IsOwnedByCurrentThread () const

ALIB_API void	Release ()
	defined(ALIB_DOX)

ALIB_API void	SetSafeness (lang::Safeness safeness)

bool	WillRelease () const

Additional Inherited Members
Public Static Method Index: inherited from Formatter
static SPFormatter	AcquireDefault (const NCString &dbgFile, int dbgLine, const NCString &dbgFunc)

static SPFormatter	GetDefault ()

Public Field Index: inherited from Formatter
NumberFormat	AlternativeNumberFormat

NumberFormat	DefaultNumberFormat

std::shared_ptr< Formatter >	Next

Public Field Index: inherited from ThreadLock
NCString	DbgOwnerFile =nullptr

NCString	DbgOwnerFunc =nullptr

int	DbgOwnerLine

uint16_t	DbgRecursionWarningThreshold =10

integer	DbgWarningAfterWaitTimeInMillis =2000L

Field Details:

◆ placeholderJS

PlaceholderAttributesJS placeholderJS

protected

The extended placeholder attributes.

Definition at line 156 of file formatterjavastyle.hpp.

Constructor(s) / Destructor Details::

◆ FormatterJavaStyle()

FormatterJavaStyle ( )

Constructs this formatter. Inherited field DefaultNumberFormat is initialized to meet the formatting defaults of Java.

Definition at line 27 of file formatterjavastyle.cpp.

Method Details:

◆ checkStdFieldAgainstArgument()

bool checkStdFieldAgainstArgument ( )

overrideprotectedvirtual

Makes some attribute adjustments and invokes standard implementation

Returns: true if OK, false if replacement should be aborted.

Reimplemented from FormatterStdImpl.

Definition at line 415 of file formatterjavastyle.cpp.

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◆ Clone()

FormatterStdImpl * Clone ( )

overridevirtual

Clones and returns a copy of this formatter.

If the formatter attached to field Formatter::Next is of type FormatterStdImpl, then that formatter is copied as well.

Returns: An object of type FormatterPythonStyle and with the same custom settings than this.

Implements Formatter.

Definition at line 50 of file formatterjavastyle.cpp.

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◆ findPlaceholder()

integer findPlaceholder ( )

overrideprotectedvirtual

Searches for '%' which is not '%' or 'n'.

Returns: The index found, -1 if not found.

Implements FormatterStdImpl.

Definition at line 85 of file formatterjavastyle.cpp.

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◆ parsePlaceholder()

bool parsePlaceholder ( )

overrideprotectedvirtual

Parses placeholder field in Java syntax. The portion format_spec is not set as this is not supported by the syntax.

Returns: true on success, false on errors.

Implements FormatterStdImpl.

Definition at line 158 of file formatterjavastyle.cpp.

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◆ parseStdFormatSpec()

virtual bool parseStdFormatSpec ( )

inlineoverrideprotectedvirtual

Does nothing. Java does not support custom format specifications.

Returns: true to indicate success.

Implements FormatterStdImpl.

Definition at line 220 of file formatterjavastyle.hpp.

◆ preAndPostProcess()

bool preAndPostProcess	(	integer	startIdx,
		AString *	target )

overrideprotectedvirtual

All that this formatter does with this overridden method is to convert strings to upper case.

Parameters

startIdx	The index of the start of the field written in targetString. `-1` indicates pre-phase.
target	The target string, only if different from field targetString, which indicates intermediate phase.

Returns: false, if the placeholder should be skipped (nothing is written for it). true otherwise.

Reimplemented from FormatterStdImpl.

Definition at line 407 of file formatterjavastyle.cpp.

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◆ resetPlaceholder()

void resetPlaceholder ( )

overrideprotectedvirtual

Invokes parent implementation and then applies some changes to reflect what is defined as default in the Java string format specification.

Reimplemented from FormatterStdImpl.

Definition at line 66 of file formatterjavastyle.cpp.

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◆ writeStringPortion()

void writeStringPortion ( integer length )

overrideprotectedvirtual

Implementation of abstract method FormatterStdImpl::writeStringPortion .
Replaces "%%" with '%' and "%n" with ascii 0x0a. In addition applies Format::Escape on target which replaces standard codes like "\\n", "\\r" or "\\t" with corresponding ascii codes. (The latter is an extension to the standard behavior of Java formatter.)

Parameters

length The number of characters to write.

Implements FormatterStdImpl.

Definition at line 99 of file formatterjavastyle.cpp.

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The documentation for this class was generated from the following files:

Description:

Reference Documentation

Inner Type Index:

Public Method Index:

Additional Inherited Members

Field Details:

◆ placeholderJS

Constructor(s) / Destructor Details::

◆ FormatterJavaStyle()

Method Details:

◆ checkStdFieldAgainstArgument()

◆ Clone()

◆ findPlaceholder()

◆ parsePlaceholder()

◆ parseStdFormatSpec()

◆ preAndPostProcess()

◆ resetPlaceholder()

◆ writeStringPortion()