Formats simple patterns like "{1} was born in {0}". More...

#include <simpleformatter.h>

Inheritance diagram for icu::SimpleFormatter:

Public Member Functions
	SimpleFormatter ()
	Default constructor.

	SimpleFormatter (const UnicodeString &pattern, UErrorCode &errorCode)
	Constructs a formatter from the pattern string.

	SimpleFormatter (const UnicodeString &pattern, int32_t min, int32_t max, UErrorCode &errorCode)
	Constructs a formatter from the pattern string.

	SimpleFormatter (const SimpleFormatter &other)
	Copy constructor.

SimpleFormatter &	operator= (const SimpleFormatter &other)
	Assignment operator.

	~SimpleFormatter ()
	Destructor.

UBool	applyPattern (const UnicodeString &pattern, UErrorCode &errorCode)
	Changes this object according to the new pattern.

UBool	applyPatternMinMaxArguments (const UnicodeString &pattern, int32_t min, int32_t max, UErrorCode &errorCode)
	Changes this object according to the new pattern.

int32_t	getArgumentLimit () const

UnicodeString &	format (const UnicodeString &value0, UnicodeString &appendTo, UErrorCode &errorCode) const
	Formats the given value, appending to the appendTo builder.

UnicodeString &	format (const UnicodeString &value0, const UnicodeString &value1, UnicodeString &appendTo, UErrorCode &errorCode) const
	Formats the given values, appending to the appendTo builder.

UnicodeString &	format (const UnicodeString &value0, const UnicodeString &value1, const UnicodeString &value2, UnicodeString &appendTo, UErrorCode &errorCode) const
	Formats the given values, appending to the appendTo builder.

UnicodeString &	formatAndAppend (const UnicodeString const values, int32_t valuesLength, UnicodeString &appendTo, int32_t *offsets, int32_t offsetsLength, UErrorCode &errorCode) const
	Formats the given values, appending to the appendTo string.

UnicodeString &	formatAndReplace (const UnicodeString const values, int32_t valuesLength, UnicodeString &result, int32_t *offsets, int32_t offsetsLength, UErrorCode &errorCode) const
	Formats the given values, replacing the contents of the result string.

UnicodeString	getTextWithNoArguments () const
	Returns the pattern text with none of the arguments.

UnicodeString	getTextWithNoArguments (int32_t *offsets, int32_t offsetsLength) const
	Returns the pattern text with none of the arguments.

Friends
class	number::impl::SimpleModifier

Detailed Description

Formats simple patterns like "{1} was born in {0}".

Minimal subset of MessageFormat; fast, simple, minimal dependencies. Supports only numbered arguments with no type nor style parameters, and formats only string values. Quoting via ASCII apostrophe compatible with ICU MessageFormat default behavior.

Factory methods set error codes for syntax errors and for too few or too many arguments/placeholders.

SimpleFormatter objects are thread-safe except for assignment and applying new patterns.

Example:

UErrorCode errorCode = U_ZERO_ERROR;
SimpleFormatter fmt("{1} '{born}' in {0}", errorCode);
UnicodeString result;

// Output: "paul {born} in england"
fmt.format("england", "paul", result, errorCode);

This class is not intended for public subclassing.

See also: MessageFormat; UMessagePatternApostropheMode

Stable:: ICU 57

Definition at line 60 of file simpleformatter.h.

Constructor & Destructor Documentation

◆ SimpleFormatter() [1/4]

icu::SimpleFormatter::SimpleFormatter ( )

inline

Default constructor.

Stable:: ICU 57

Definition at line 66 of file simpleformatter.h.

◆ SimpleFormatter() [2/4]

icu::SimpleFormatter::SimpleFormatter	(	const UnicodeString &	pattern,
		UErrorCode &	errorCode
	)

inline

Constructs a formatter from the pattern string.

Parameters

pattern	The pattern string.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call. Set to U_ILLEGAL_ARGUMENT_ERROR for bad argument syntax.

Stable:: ICU 57

Definition at line 77 of file simpleformatter.h.

◆ SimpleFormatter() [3/4]

icu::SimpleFormatter::SimpleFormatter	(	const UnicodeString &	pattern,
		int32_t	min,
		int32_t	max,
		UErrorCode &	errorCode
	)

inline

Constructs a formatter from the pattern string.

The number of arguments checked against the given limits is the highest argument number plus one, not the number of occurrences of arguments.

Parameters

pattern	The pattern string.
min	The pattern must have at least this many arguments.
max	The pattern must have at most this many arguments.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call. Set to U_ILLEGAL_ARGUMENT_ERROR for bad argument syntax and too few or too many arguments.

Stable:: ICU 57

Definition at line 95 of file simpleformatter.h.

◆ SimpleFormatter() [4/4]

icu::SimpleFormatter::SimpleFormatter ( const SimpleFormatter & other )

inline

Copy constructor.

Stable:: ICU 57

Definition at line 104 of file simpleformatter.h.

◆ ~SimpleFormatter()

icu::SimpleFormatter::~SimpleFormatter ( )

Destructor.

Stable:: ICU 57

Member Function Documentation

◆ applyPattern()

UBool icu::SimpleFormatter::applyPattern	(	const UnicodeString &	pattern,
		UErrorCode &	errorCode
	)

inline

Changes this object according to the new pattern.

Parameters

pattern	The pattern string.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call. Set to U_ILLEGAL_ARGUMENT_ERROR for bad argument syntax.

Returns: true if U_SUCCESS(errorCode).

Stable:: ICU 57

Definition at line 129 of file simpleformatter.h.

References INT32_MAX.

◆ applyPatternMinMaxArguments()

UBool icu::SimpleFormatter::applyPatternMinMaxArguments	(	const UnicodeString &	pattern,
		int32_t	min,
		int32_t	max,
		UErrorCode &	errorCode
	)

Changes this object according to the new pattern.

The number of arguments checked against the given limits is the highest argument number plus one, not the number of occurrences of arguments.

Parameters

pattern	The pattern string.
min	The pattern must have at least this many arguments.
max	The pattern must have at most this many arguments.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call. Set to U_ILLEGAL_ARGUMENT_ERROR for bad argument syntax and too few or too many arguments.

Returns: true if U_SUCCESS(errorCode).

Stable:: ICU 57

◆ format() [1/3]

UnicodeString & icu::SimpleFormatter::format	(	const UnicodeString &	value0,
		const UnicodeString &	value1,
		const UnicodeString &	value2,
		UnicodeString &	appendTo,
		UErrorCode &	errorCode
	)		const

Formats the given values, appending to the appendTo builder.

An argument value must not be the same object as appendTo. getArgumentLimit() must be at most 3.

Parameters

value0	Value for argument {0}.
value1	Value for argument {1}.
value2	Value for argument {2}.
appendTo	Gets the formatted pattern and values appended.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call.

Returns: appendTo

Stable:: ICU 57

◆ format() [2/3]

UnicodeString & icu::SimpleFormatter::format	(	const UnicodeString &	value0,
		const UnicodeString &	value1,
		UnicodeString &	appendTo,
		UErrorCode &	errorCode
	)		const

Formats the given values, appending to the appendTo builder.

An argument value must not be the same object as appendTo. getArgumentLimit() must be at most 2.

Parameters

value0	Value for argument {0}.
value1	Value for argument {1}.
appendTo	Gets the formatted pattern and values appended.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call.

Returns: appendTo

Stable:: ICU 57

◆ format() [3/3]

UnicodeString & icu::SimpleFormatter::format	(	const UnicodeString &	value0,
		UnicodeString &	appendTo,
		UErrorCode &	errorCode
	)		const

Formats the given value, appending to the appendTo builder.

The argument value must not be the same object as appendTo. getArgumentLimit() must be at most 1.

Parameters

value0	Value for argument {0}.
appendTo	Gets the formatted pattern and value appended.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call.

Returns: appendTo

Stable:: ICU 57

◆ formatAndAppend()

UnicodeString & icu::SimpleFormatter::formatAndAppend	(	const UnicodeString const	values,
		int32_t	valuesLength,
		UnicodeString &	appendTo,
		int32_t *	offsets,
		int32_t	offsetsLength,
		UErrorCode &	errorCode
	)		const

Formats the given values, appending to the appendTo string.

Parameters

values	The argument values. An argument value must not be the same object as appendTo. Can be nullptr if valuesLength==getArgumentLimit()==0.
valuesLength	The length of the values array. Must be at least getArgumentLimit().
appendTo	Gets the formatted pattern and values appended.
offsets	offsets[i] receives the offset of where values[i] replaced pattern argument {i}. Can be shorter or longer than values. Can be nullptr if offsetsLength==0. If there is no {i} in the pattern, then offsets[i] is set to -1.
offsetsLength	The length of the offsets array.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call.

Returns: appendTo

Stable:: ICU 57

◆ formatAndReplace()

UnicodeString & icu::SimpleFormatter::formatAndReplace	(	const UnicodeString const	values,
		int32_t	valuesLength,
		UnicodeString &	result,
		int32_t *	offsets,
		int32_t	offsetsLength,
		UErrorCode &	errorCode
	)		const

Formats the given values, replacing the contents of the result string.

May optimize by actually appending to the result if it is the same object as the value corresponding to the initial argument in the pattern.

Parameters

values	The argument values. An argument value may be the same object as result. Can be nullptr if valuesLength==getArgumentLimit()==0.
valuesLength	The length of the values array. Must be at least getArgumentLimit().
result	Gets its contents replaced by the formatted pattern and values.
offsets	offsets[i] receives the offset of where values[i] replaced pattern argument {i}. Can be shorter or longer than values. Can be nullptr if offsetsLength==0. If there is no {i} in the pattern, then offsets[i] is set to -1.
offsetsLength	The length of the offsets array.
errorCode	ICU error code in/out parameter. Must fulfill U_SUCCESS before the function call.

Returns: result

Stable:: ICU 57

◆ getArgumentLimit()

int32_t icu::SimpleFormatter::getArgumentLimit ( ) const

inline

Returns: The max argument number + 1.

Stable:: ICU 57

Definition at line 155 of file simpleformatter.h.

◆ getTextWithNoArguments() [1/2]

UnicodeString icu::SimpleFormatter::getTextWithNoArguments ( ) const

inline

Returns the pattern text with none of the arguments.

Like formatting with all-empty string values.

Stable:: ICU 57

Definition at line 268 of file simpleformatter.h.

◆ getTextWithNoArguments() [2/2]

UnicodeString icu::SimpleFormatter::getTextWithNoArguments	(	int32_t *	offsets,
		int32_t	offsetsLength
	)		const

inline

Returns the pattern text with none of the arguments.

Like formatting with all-empty string values.

TODO(ICU-20406): Replace this with an Iterator interface.

Parameters

offsets	offsets[i] receives the offset of where {i} was located before it was replaced by an empty string. For example, "a{0}b{1}" produces offset 1 for i=0 and 2 for i=1. Can be nullptr if offsetsLength==0. If there is no {i} in the pattern, then offsets[i] is set to -1.
offsetsLength	The length of the offsets array.

Internal:: Do not use. This API is for internal use only.

Definition at line 292 of file simpleformatter.h.

◆ operator=()

SimpleFormatter & icu::SimpleFormatter::operator= ( const SimpleFormatter & other )

Assignment operator.

Stable:: ICU 57

Friends And Related Symbol Documentation

◆ number::impl::SimpleModifier

friend class number::impl::SimpleModifier

friend

Definition at line 332 of file simpleformatter.h.

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

common/unicode/simpleformatter.h

Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ SimpleFormatter() [1/4]

◆ SimpleFormatter() [2/4]

◆ SimpleFormatter() [3/4]

◆ SimpleFormatter() [4/4]

◆ ~SimpleFormatter()

Member Function Documentation

◆ applyPattern()

◆ applyPatternMinMaxArguments()

◆ format() [1/3]

◆ format() [2/3]

◆ format() [3/3]

◆ formatAndAppend()

◆ formatAndReplace()

◆ getArgumentLimit()

◆ getTextWithNoArguments() [1/2]

◆ getTextWithNoArguments() [2/2]

◆ operator=()

Friends And Related Symbol Documentation

◆ number::impl::SimpleModifier