Package org.unbescape.css
Enum CssIdentifierEscapeLevel
- All Implemented Interfaces:
Serializable
,Comparable<CssIdentifierEscapeLevel>
,java.lang.constant.Constable
Levels defined for escape/unescape operations of CSS identifiers:
- Level 1: Escape only the basic escape set. Note the result of a level-1 escape
operation might still contain non-ASCII characters if they existed in input, and therefore you
will still need to correctly manage your input/output character encoding settings. Such
basic set consists of:
- The Backslash Escapes: \ (U+0020), \! (U+0021), \" (U+0022), \# (U+0023), \$ (U+0024), \% (U+0025), \& (U+0026), \' (U+0027), \( (U+0028), \) (U+0029), \* (U+002A), \+ (U+002B), \, (U+002C), \. (U+002E), \/ (U+002F), \; (U+003B), \< (U+003C), \= (U+003D), \> (U+003E), \? (U+003F), \@ (U+0040), \[ (U+005B), \\ (U+005C), \] (U+005D), \^ (U+005E), \` (U+0060), \{ (U+007B), \| (U+007C), \} (U+007D) and \~ (U+007E). Note that the \- (U+002D) escape sequence exists, but will only be used when an identifier starts with two hypens or hyphen + digit. Also, the \_ (U+005F) escape will only be used at the beginning of an identifier to avoid problems with Internet Explorer 6. In the same sense, note that the \: (U+003A) escape sequence is also defined in the standard, but will not be used for escaping as Internet Explorer < 8 does not recognize it.
- Two ranges of non-displayable, control characters: U+0000 to U+001F and U+007F to U+009F.
- Level 2: Escape the basic escape set (as defined in level 1), plus all non-ASCII characters. The result of a level-2 escape operation is therefore always ASCII-only text, and safer to use in complex scenarios with mixed input/output character encodings.
- Level 3: Escape all non-alphanumeric characters, this is, all but those in the A-Z, a-z and 0-9 ranges. This level can be safely used for completely escaping texts, including whitespace, line feeds, punctuation, etc. in scenarios where this adds an extra level of safety.
- Level 4: Escape all characters, even alphanumeric ones.
For further information, see the Glossary and the References sections at the
documentation for the CssEscape
class.
- Since:
- 1.0.0
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Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>>
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Enum Constant Summary
Enum ConstantsEnum ConstantDescriptionLevel 1 escape: escape only the basic escape set: Backslash Escape plus non-displayable control chars.Level 2 escape: escape the basic escape set plus all non-ASCII characters (result will always be ASCII).Level 3 escape: escape all non-alphanumeric characteres (escape all but those in the A-Z, a-z and 0-9 ranges).Level 4 escape: escape all characters, including alphanumeric. -
Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic CssIdentifierEscapeLevel
forLevel
(int level) Utility method for obtaining an enum value from its corresponding int level value.int
Return the int escape level.static CssIdentifierEscapeLevel
Returns the enum constant of this type with the specified name.static CssIdentifierEscapeLevel[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Details
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LEVEL_1_BASIC_ESCAPE_SET
Level 1 escape: escape only the basic escape set: Backslash Escape plus non-displayable control chars. -
LEVEL_2_ALL_NON_ASCII_PLUS_BASIC_ESCAPE_SET
Level 2 escape: escape the basic escape set plus all non-ASCII characters (result will always be ASCII). -
LEVEL_3_ALL_NON_ALPHANUMERIC
Level 3 escape: escape all non-alphanumeric characteres (escape all but those in the A-Z, a-z and 0-9 ranges). -
LEVEL_4_ALL_CHARACTERS
Level 4 escape: escape all characters, including alphanumeric.
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Field Details
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escapeLevel
private final int escapeLevel
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Constructor Details
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CssIdentifierEscapeLevel
private CssIdentifierEscapeLevel(int escapeLevel)
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Method Details
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values
Returns an array containing the constants of this enum type, in the order they are declared.- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is null
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forLevel
Utility method for obtaining an enum value from its corresponding int level value.
- Parameters:
level
- the level- Returns:
- the escape level enum constant, or IllegalArgumentException if level does not exist.
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getEscapeLevel
public int getEscapeLevel()Return the int escape level.- Returns:
- the escape level.
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