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messagepattern.h File Reference

C++ API: MessagePattern class: Parses and represents ICU MessageFormat patterns. More...

`#include "unicode/utypes.h"`
`#include "unicode/parseerr.h"`
`#include "unicode/unistr.h"`

Go to the source code of this file.

## Data Structures
class | icu::MessagePattern
| Parses and represents ICU MessageFormat patterns. More...
class | icu::MessagePattern::Part
| A message pattern "part", representing a pattern parsing event. More...

## Namespaces
namespace | icu
| File coll.h.

## Macros
#define | UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) ((argType)==UMSGPAT_ARG_TYPE_PLURAL || (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL)
| Returns TRUE if the argument type has a plural style part sequence and semantics, for example UMSGPAT_ARG_TYPE_PLURAL and UMSGPAT_ARG_TYPE_SELECTORDINAL.
#define | UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789))
| Special value that is returned by getNumericValue(Part) when no numeric value is defined for a part.

## Typedefs
typedef enum UMessagePatternApostropheMode | UMessagePatternApostropheMode
typedef enum UMessagePatternPartType | UMessagePatternPartType
typedef enum UMessagePatternArgType | UMessagePatternArgType

## Enumerations
enum | UMessagePatternApostropheMode { UMSGPAT_APOS_DOUBLE_OPTIONAL, UMSGPAT_APOS_DOUBLE_REQUIRED }
| Mode for when an apostrophe starts quoted literal text for MessageFormat output. More...
enum | UMessagePatternPartType { UMSGPAT_PART_TYPE_MSG_START, UMSGPAT_PART_TYPE_MSG_LIMIT, UMSGPAT_PART_TYPE_SKIP_SYNTAX, UMSGPAT_PART_TYPE_INSERT_CHAR, UMSGPAT_PART_TYPE_REPLACE_NUMBER, UMSGPAT_PART_TYPE_ARG_START, UMSGPAT_PART_TYPE_ARG_LIMIT, UMSGPAT_PART_TYPE_ARG_NUMBER, UMSGPAT_PART_TYPE_ARG_NAME, UMSGPAT_PART_TYPE_ARG_TYPE, UMSGPAT_PART_TYPE_ARG_STYLE, UMSGPAT_PART_TYPE_ARG_SELECTOR, UMSGPAT_PART_TYPE_ARG_INT, UMSGPAT_PART_TYPE_ARG_DOUBLE }
| MessagePattern::Part type constants. More...
enum | UMessagePatternArgType { UMSGPAT_ARG_TYPE_NONE, UMSGPAT_ARG_TYPE_SIMPLE, UMSGPAT_ARG_TYPE_CHOICE, UMSGPAT_ARG_TYPE_PLURAL, UMSGPAT_ARG_TYPE_SELECT, UMSGPAT_ARG_TYPE_SELECTORDINAL }
| Argument type constants. More...
enum | { UMSGPAT_ARG_NAME_NOT_NUMBER = -1, UMSGPAT_ARG_NAME_NOT_VALID = -2 }

## Detailed Description

C++ API: MessagePattern class: Parses and represents ICU MessageFormat patterns.

Definition in file messagepattern.h.

## Macro Definition Documentation

#define UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE | ( |  | argType | ) | ((argType)==UMSGPAT_ARG_TYPE_PLURAL || (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL)

Returns TRUE if the argument type has a plural style part sequence and semantics, for example UMSGPAT_ARG_TYPE_PLURAL and UMSGPAT_ARG_TYPE_SELECTORDINAL.

Stable:
  ICU 50

Definition at line 268 of file messagepattern.h.

#define UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789))

Special value that is returned by getNumericValue(Part) when no numeric value is defined for a part.

See Also
  MessagePattern.getNumericValue()

Stable:
  ICU 4.8

Definition at line 295 of file messagepattern.h.

## Typedef Documentation

typedef enum UMessagePatternApostropheMode UMessagePatternApostropheMode

Stable:
  ICU 4.8

Definition at line 92 of file messagepattern.h.

typedef enum UMessagePatternArgType UMessagePatternArgType

Stable:
  ICU 4.8

Definition at line 260 of file messagepattern.h.

typedef enum UMessagePatternPartType UMessagePatternPartType

Stable:
  ICU 4.8

Definition at line 207 of file messagepattern.h.

## Enumeration Type Documentation

anonymous enum

Enumerator:

  UMSGPAT_ARG_NAME_NOT_NUMBER | Return value from MessagePattern.validateArgumentName() for when the string is a valid "pattern identifier" but not a number. Stable: ICU 4.8
  UMSGPAT_ARG_NAME_NOT_VALID | Return value from MessagePattern.validateArgumentName() for when the string is invalid. It might not be a valid "pattern identifier", or it have only ASCII digits but there is a leading zero or the number is too large. Stable: ICU 4.8

Definition at line 271 of file messagepattern.h.

enum UMessagePatternApostropheMode

Mode for when an apostrophe starts quoted literal text for MessageFormat output.

The default is DOUBLE_OPTIONAL unless overridden via uconfig.h (UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE).

A pair of adjacent apostrophes always results in a single apostrophe in the output, even when the pair is between two single, text-quoting apostrophes.

The following table shows examples of desired MessageFormat.format() output with the pattern strings that yield that output.

Desired output | DOUBLE_OPTIONAL | DOUBLE_REQUIRED
--- | --- | ---
I see {many} | I see '{many}' | (same)
I said {'Wow!'} | I said '{''Wow!''}' | (same)
I don't know | I don't know OR I don''t know | I don''t know

Stable:
  ICU 4.8

See Also
  UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE

Enumerator:

  UMSGPAT_APOS_DOUBLE_OPTIONAL | A literal apostrophe is represented by either a single or a double apostrophe pattern character. Within a MessageFormat pattern, a single apostrophe only starts quoted literal text if it immediately precedes a curly brace {}, or a pipe symbol | if inside a choice format, or a pound symbol # if inside a plural format. This is the default behavior starting with ICU 4.8. Stable: ICU 4.8
  UMSGPAT_APOS_DOUBLE_REQUIRED | A literal apostrophe must be represented by a double apostrophe pattern character. A single apostrophe always starts quoted literal text. This is the behavior of ICU 4.6 and earlier, and of the JDK. Stable: ICU 4.8

Definition at line 66 of file messagepattern.h.

enum UMessagePatternArgType

Argument type constants.

Returned by Part.getArgType() for ARG_START and ARG_LIMIT parts.

Messages nested inside an argument are each delimited by MSG_START and MSG_LIMIT, with a nesting level one greater than the surrounding message.

Stable:
  ICU 4.8

Enumerator:

  UMSGPAT_ARG_TYPE_NONE | The argument has no specified type. Stable: ICU 4.8
  UMSGPAT_ARG_TYPE_SIMPLE | The argument has a "simple" type which is provided by the ARG_TYPE part. An ARG_STYLE part might follow that. Stable: ICU 4.8
  UMSGPAT_ARG_TYPE_CHOICE | The argument is a ChoiceFormat with one or more ((ARG_INT | ARG_DOUBLE), ARG_SELECTOR, message) tuples. Stable: ICU 4.8
  UMSGPAT_ARG_TYPE_PLURAL | The argument is a cardinal-number PluralFormat with an optional ARG_INT or ARG_DOUBLE offset (e.g., offset:1) and one or more (ARG_SELECTOR [explicit-value] message) tuples. If the selector has an explicit value (e.g., =2), then that value is provided by the ARG_INT or ARG_DOUBLE part preceding the message. Otherwise the message immediately follows the ARG_SELECTOR. Stable: ICU 4.8
  UMSGPAT_ARG_TYPE_SELECT | The argument is a SelectFormat with one or more (ARG_SELECTOR, message) pairs. Stable: ICU 4.8
  UMSGPAT_ARG_TYPE_SELECTORDINAL | The argument is an ordinal-number PluralFormat with the same style parts sequence and semantics as UMSGPAT_ARG_TYPE_PLURAL. Stable: ICU 50

Definition at line 217 of file messagepattern.h.

enum UMessagePatternPartType

MessagePattern::Part type constants.

Stable:
  ICU 4.8

Enumerator:

  UMSGPAT_PART_TYPE_MSG_START | Start of a message pattern (main or nested). The length is 0 for the top-level message and for a choice argument sub-message, otherwise 1 for the '{'. The value indicates the nesting level, starting with 0 for the main message. There is always a later MSG_LIMIT part. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_MSG_LIMIT | End of a message pattern (main or nested). The length is 0 for the top-level message and the last sub-message of a choice argument, otherwise 1 for the '}' or (in a choice argument style) the '|'. The value indicates the nesting level, starting with 0 for the main message. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_SKIP_SYNTAX | Indicates a substring of the pattern string which is to be skipped when formatting. For example, an apostrophe that begins or ends quoted text would be indicated with such a part. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_INSERT_CHAR | Indicates that a syntax character needs to be inserted for auto-quoting. The length is 0. The value is the character code of the insertion character. (U+0027=APOSTROPHE) Stable: ICU 4.8
  UMSGPAT_PART_TYPE_REPLACE_NUMBER | Indicates a syntactic (non-escaped) # symbol in a plural variant. When formatting, replace this part's substring with the (value-offset) for the plural argument value. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_START | Start of an argument. The length is 1 for the '{'. The value is the ordinal value of the ArgType. Use getArgType(). This part is followed by either an ARG_NUMBER or ARG_NAME, followed by optional argument sub-parts (see UMessagePatternArgType constants) and finally an ARG_LIMIT part. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_LIMIT | End of an argument. The length is 1 for the '}'. The value is the ordinal value of the ArgType. Use getArgType(). Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_NUMBER | The argument number, provided by the value. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_NAME | The argument name. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_TYPE | The argument type. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_STYLE | The argument style text. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_SELECTOR | A selector substring in a "complex" argument style. The value is undefined and currently always 0. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_INT | An integer value, for example the offset or an explicit selector value in a PluralFormat style. The part value is the integer value. Stable: ICU 4.8
  UMSGPAT_PART_TYPE_ARG_DOUBLE | A numeric value, for example the offset or an explicit selector value in a PluralFormat style. The part value is an index into an internal array of numeric values; use getNumericValue(). Stable: ICU 4.8

Definition at line 98 of file messagepattern.h.