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Provides methods for querying the properties of Unicode characters. More...
#include <rw/i18n/RWUCharTraits.h>
RWUCharTraits provides methods for querying the properties of Unicode characters.
The Unicode Standard defines a comprehensive set of properties for each code point in the Unicode character set. The set of properties and the values of those properties are specified by the Unicode Character Database:
http://www.unicode.org/onlinedat/online.html
that is published as part of the Unicode Standard:
http://www.unicode.org/standard/standard.html
Unicode character properties may be either normative or informative, as defined in Chapter 3, "Conformance", of the Unicode Standard:
RWUCharTraits provides access to both normative and informative properties of Unicode characters.
An enumeration used to describe the linguistic direction of a Unicode character code point. The values in this enumeration correspond to the bidirectional category property codes that appear in the file UnicodeData.txt of the Unicode Character Database, as described in
http://www.unicode.org/reports/tr44/
The bidirectional property is a normative property of the Unicode Standard.
| enum RWUCharTraits::Block |
An enumeration used to identify the various Unicode character blocks. The values in this enumeration correspond to the block names that appear in the file Blocks.txt of the Unicode Character Database, as described in Chapter 14, "Code Charts", of the Unicode Standard:
http://www.unicode.org/standard/standard.html
The block property is an informative property of the Unicode Standard.
An enumeration used to identify the combining class property to which each Unicode combining character belongs. See Chapter 3, "Conformance", and Chapter 4, "Character Properties", in the Unicode Standard:
http://www.unicode.org/standard/standard.html
The combining class property is a normative property of the Unicode Standard. The numeric value of each combining class and the number of classes are not normative and may change in future versions of the Unicode Standard.
An enumeration used to describe the display cell width of characters in East Asian text. The values in this enumeration correspond to the East Asian width property values defined in the EastAsianWidth.txt file Unicode Character Database (UCD), as described in Unicode Standard Annex #11, "East Asian Width":
http://www.unicode.org/reports/tr11
In accordance with changes to the Unicode specification for East Asian Width values, the ICU implementation changed between versions 2.4 and 2.6. Prior to ICU 2.6 (June 2003), the SourcePro Core Internationalization Module used the following declaration for EastAsianWidth:
An enumeration of the general categories used to classify Unicode characters. The values in this enumeration correspond to the general category property codes that appear in the UnicodeData.txt file of the Unicode Character Database, as described in:
http://www.unicode.org/reports/tr44/
An enumeration used to identify Unicode scripts. The values in this enumeration correspond to the script property names defined in the Scripts.txt file of the Unicode Character Database, as described in Unicode Technical Report #24, "Script Names":
http://www.unicode.org/reports/tr24
The script property is an informative property of the Unicode Standard.
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inlinestatic |
Returns the value of the bidirectional category property for the Unicode character whose code point is equal to cp. A value of NoBidirectionalCategory is returned if cp is not a valid character. The directional type of a character is defined in the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The bidirectional property is a normative property of the Unicode Standard.
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inlinestatic |
Returns the value in the Block enumeration that identifies the character block which contains the Unicode character whose code point is equal to cp. A value of NoBlock is returned if cp is not a valid character. The character block is determined using information in the Blocks.txt file of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
as described in Chapter 14, "Code Charts" of the Unicode Standard:
http://www.unicode.org/standard/standard.html
The block property is an informative property of the Unicode Standard.
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inlinestatic |
Returns the code point of the Unicode character whose character name property value is equal to the value given for name. Returns a value of 0xFFFF, if no character whose name is name exists.
Each character may have two different names; a deprecated name, as originally defined by Unicode 1.0, and a standard name, as defined in subsequent versions of the standard. These names are defined in the UnicodeData.txt file of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
isDeprecatedName equals true indicates that name is a character name defined in Version 1.0 of the Unicode Standard; false indicates that name is a character name defined in Version 2.0 and subsequent versions of the Unicode Standard. The default value is false.
The character name property is a normative property of the Unicode Standard.
| RWUException | Thrown if an error occurs. |
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inlinestatic |
Returns the value of the combining class property for the Unicode character whose code point is cp. Each combining character is assigned a number that identifies the set containing all of the combining characters it typographically interacts with. See Chapter 3, "Conformance", of the Unicode Standard:
http://www.unicode.org/standard/standard.html
The combining class property is a normative property of the Unicode Standard. The numeric value of each combining class and the number of classes are not normative and may change in future versions of the Unicode Standard. The relative ordering of the classes is normative.
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inlinestatic |
Returns the value of the decimal digit property for the Unicode character whose code point is equal to cp, if that character possesses the decimal digit property; otherwise, -1. The numeric value of a decimal digit is determined using information in the file UnicodeData.txt as described in:
http://www.unicode.org/reports/tr44/
See Chapter 3, "Conformance", and Chapter 4, "Character Properties", of the Unicode Standard:
http://www.unicode.org/standard/standard.html
The decimal digit value property is a normative property of the Unicode Standard.
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inlinestatic |
Returns the RWUChar32 code point corresponding to the US-ASCII character in the range [0-9a-z]. Converts an integer value into a corresponding US-ASCII alphanumeric digit, given some radix in the range 2-36. value must be in the range 0 <= digit <= radix. For example, RWUCharTraits::getDigit(15, 16) returns the code point for f (U+0066).
In case of invalid value or invalid radix or the combination, returns null.
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inlinestatic |
Returns the value of the East Asian width property for the Unicode character whose code point is equal to cp. The display cell width of an East-Asian character is determined using information in the file EastAsianWidth.txt of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The Unicode Standard contains a complete set of precomposed modern Hangul syllables, as well as the set of conjoining jamo characters required to encode both modern and archaic syllable blocks. The Hangul jamo characters can be organized into the following classes:
When used with Korean Hangul, this function treats choseong jamo as double-width characters, and jungseong and jongseong jamo as zero-width characters. The result is correct only if the specified character is a precomposed choseong character and not part of a sequence of two choseong characters.
The East Asian width property is an informative property of the Unicode Standard. For more information, see Unicode Technical Report #11, "East Asian Character Width":
http://www.unicode.org/reports/tr11/
and Chapter 10, "East Asian Scripts", in the Unicode Standard:
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inlinestatic |
Returns the value of the general category property for the Unicode character whose code point is cp. Character categories are assigned in the file UnicodeData.txt of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The general category property is a normative property of the Unicode Standard. For more information, see Chapter 4 "Character Properties" in the Unicode Standard:
Returns the code point of the character that provides a "mirror-image" of the Unicode character whose code point is cp, as defined by the Unicode Standard, or the value of cp, if no such character exists. The mirror for cp is determined using information in the file BidiMirroring.txt of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
as described in Unicode Standard Annex #9, "The Bidirectional Algorithm":
http://www.unicode.org/reports/tr9/
For more information, see Chapter 4 "Character Properties" in the Unicode Standard:
http://www.unicode.org/standard/standard.html
Returns the value of the character name property for the Unicode character whose code point is cp.
The name property is a normative property of the Unicode Standard.
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inlinestatic |
Converts the code point cp of a digit character in the specified radix into an equivalent integer value.
Returns the numeric value of the character cp as follows:
2-36, or if the value of cp is not a valid digit in that radix, then -1 is returned.UnicodeData.txt file of the Unicode Character Database, and the decimal value given for that digit is less than the specified radix, then the decimal value of that digit is returned.A-Z and its code point value is less than (radix + 'A' - 10), then the value of the expression (cp - 'A' + 10) is returned.a-z and its code point value is less than (radix + 'a' - 10), then the value of the expression (cp - 'a' + 10) is returned. Returns the value of the script property of the Unicode character whose code point is cp.
The script property is an informative property of the Unicode Standard.
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inlinestatic |
Returns a null-terminated array of code points that are reasonably considered to be a word break or whitespace. The list of such code points is provided only as a convenience for use as delimiters (see RWUTokenizer).
Whitespace is not a property of the Unicode standard.
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inlinestatic |
Returns true if cp is a valid Unicode character code point; otherwise, false. The range of Unicode code points is 0x0 - 0x10FFFF; however, some values within this range are reserved and are not valid characters.
The character property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a control character; otherwise, false. The set of control characters is:
U+0000..U+001f and U+007f..U+009f)Cc (Other, control) categoryCf (Other, format) categoryZl (Separator, line) categoryZp (Separator, paragraph) categoryThis set is defined in the UnicodeData.txt file of the Unicode Character Database, as described in:
http://www.unicode.org/reports/tr44/
The control property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a decimal digit; otherwise, false. Decimal digits are identified using information in the file
http://www.unicode.org/Public/UNIDATA/UnicodeData.txt
according to the method described in
http://www.unicode.org/reports/tr44/
The decimal digit property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is the code point for a character named in the Unicode Character Database. A defined character is assigned various properties under the Unicode Standard. These properties can be accessed using the methods provided by this class.
The defined property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a digit; otherwise, false. Digits are identified using information in the file UnicodeData.txt of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The digit property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is an error code and not a valid character code point; otherwise, false. Some RWUChar32 values have been reserved for use in reporting errors.
The error property is a private, implementation-defined property allowed by the Unicode Standard.
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inlinestatic |
Returns true if cu is the first, or high, code unit of a surrogate pair; otherwise, false. A high surrogate has a value in the range [U+D800..U+DBFF].
The surrogate property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a letter; otherwise, false. The value of cp is the code point for a letter if it:
UnicodeData.txt of the Unicode Character Database, and the general category property for that character is one of Ll, Lu, Lt, Lm, or Lo, as described in PropList.txt file, as described in
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inlinestatic |
Returns true if cp is a code point for a lowercase letter; otherwise, false. The value is the code point for a lowercase letter if it refers to a valid character in the file UnicodeData.txt of the Unicode Character Database, and the general category property for that character is Ll, as described in:
http://www.unicode.org/reports/tr44/
The lowercase property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cu is the second, or low, code unit of a surrogate pair; otherwise, false. A low-surrogate has a value in the range [U+DC00..U+DFFF].
The surrogate property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a mirrored character; otherwise, false. Mirroring is a property of characters, such as parentheses, whose images are reflected horizontally in text that is laid out right to left. For example, the left parens is the opening parens in left-to-right text, but in right-to-left text the mirrored right parens is the opening parens. The Unicode mirrored property is described in Unicode Standard Annex #9, "The Bidirectional
Algorithm":
http://www.unicode.org/reports/tr9/
The mirrored property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a numeric character; otherwise, false. The set of numeric characters is a superset of the set of digit characters, and includes additional characters such as vulgar fractions and Roman numerals.
Numeric characters are identified using information in the UnicodeData.txt file of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The numeric property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a punctuation character; otherwise, false.
Punctuation characters are identified using information in the UnicodeData.txt file of the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The punctuation property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cu is a code unit that corresponds to a single code point, or false if the value is either part of a surrogate pair consisting of two code units.
The surrogate property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a spacing character; otherwise, false. Space characters are identified in the Unicode Character Database:
http://www.unicode.org/reports/tr44/
The space property is an informative property of the Unicode Standard.
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inlinestatic |
Returns true if cu is a surrogate in the range U+D800 through U+DFFF; otherwise, false.
Surrogates are not characters; they are reserved for use in UTF-16 strings as leading and trailing code units of multi-unit sequences used to encode single code points.
The surrogate property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for a titlecase letter; otherwise, false. The value is the code point for a titlecase letter if it refers to a valid character in the file UnicodeData.txt of the Unicode Character Database, and the general category property for that character is Lu or Lt, as described in
http://www.unicode.org/reports/tr44/
The titlecase property is a normative property of the Unicode Standard.
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inlinestatic |
Returns true if cp is a code point for an uppercase letter; otherwise, false. The value is a code point for an uppercase letter if it either:
UnicodeData.txt of the Unicode Character Database, and the general category property for that character is Lu, as described in
PropList.txt file, as described in
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inlinestatic |
Returns true if cp is recognized as whitespace.
Whitespace is not a property of the Unicode Standard.
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inlinestatic |
Returns true if cp is greater than 0xFFFF and therefore would require a surrogate representation; otherwise, false
Surrogates are a normative requirement of the Unicode Standard.
Returns the lowercase equivalent for the given character code point cp. If the code point has no lowercase equivalent, the code point itself is returned. The character is mapped to its lowercase equivalent using information in the Unicode Character Database, as described in:
http://www.unicode.org/reports/tr44/
This method can only handle simple case conversions. For locale-specific case conversions, use RWUString::toLower().
The case property is a normative property of the Unicode Standard. The lowercase mapping is an informative property of the Unicode Standard.
This method is equivalent to the ANSI/ISO-C toLower() function.
Returns the titlecase equivalent for cp. The titlecase mapping of a character is determined using information in the file UnicodeData.txt of the Unicode Character Database, as described in:
http://www.unicode.org/reports/tr44/
If the character has no titlecase equivalent, the character itself is returned.
The case property is a normative property of the Unicode Standard. A titlecase mapping is an informative property of the Unicode Standard.
Returns the uppercase equivalent for cp. The character is mapped to its uppercase equivalent using information in the Unicode Character Database, as described in:
http://www.unicode.org/reports/tr44/
If the code point has no uppercase equivalent, the code point itself is returned.
This method can only perform general letter case conversion. For language-specific case conversions, use RWUString::toUpper().
The case property is a normative property of the Unicode Standard. An uppercase mapping is an informative property of the Unicode Standard.
This method is equivalent to the ANSI/ISO-C toUpper() function.
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