Package Torello.CSS

Class Whitespace

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.CharSequence, java.lang.Comparable<java.lang.CharSequence>
    public class Whitespace
extends CSSToken
implements java.lang.CharSequence, java.io.Serializable, java.lang.Comparable<java.lang.CharSequence>
    This is a Token Data-Class. It is a descendant of the root CSSToken-Class: CSSToken. Instances of the class are usually are produced by the CSSTokenizer class. Many (but not all) of these subclasses maintain a static-method for building instances of this class named 'build'. Any CSSToken-subclass that is neither a singleton-instance, nor an "Error-Subtype" should have such a builder. Singeton instances do not need builders, and the two Error-Subtype Classes can only be generated by the tokenizer.

    All CSSToken subclasses have a CSSToken.str field which contains the exact character data that was extracted and used to construct instances of this class. All sub-casses also have several "Loop Optimization" methods. These are methods that may or may not be useful in light of some of the newer additions to JDK 17 & 21 including the 'instanceof varName' conditional-expression variable-naming features.

    The algorithms used to write this tokenizer were generated based solely on the CSS Working-Group's Syntax-Documentation. This document may be viewed here: CSS Working-Group CSS-Syntax. There is an external site that maintain all thing CSS located at drafts.csswg.org
    Any sequence of Whitespace
    See Also:
    Serialized Form


    • Field Detail

      • serialVersionUID

        🡇  ⇈  ⮫ 🗕  🗗  🗖 
        protected static final long serialVersionUID
        This fulfils the SerialVersion UID requirement for all classes that implement Java's interface java.io.Serializable. Using the Serializable Implementation offered by java is very easy, and can make saving program state when debugging a lot easier. It can also be used in place of more complicated systems like "hibernate" to store data as well.
        See Also:
        Constant Field Values
        Code:
        Exact Field Declaration Expression:
         protected static final long serialVersionUID = 1;

    • Method Detail

      • build

        🡅  🡇  ⇈  ⮫ 🗕  🗗  🗖 
        public static Whitespace build​(java.lang.String ws)
        Static-Builder Method for creating an instance of this class. This Static-Method is a substitute for an actual Constructor. Because many of the 'consume(...)' methods in the Token Classe for Torello.CSS actually generate / spit-out more than CSSToken instance, writing publicly available constructors is largely impossible.

        The upside to this approach is that the build methods and the consume methods share identical code. Furthermore this code is (nearly) perfectly based on the Pseudo-Code on the CSS Working-Group Website.
        Parameters:
        ws - Any Java-String that can be parsed into an instance of Whitespace
        Returns:
        An instance of Whitespace.

        If the contents of the Input-String parameter 'ws' cannot be consumed, exactly, by this class' 'consume' method, then an exception shall throw.
        Throws:
        TokenizeException - This exception may be thrown for any number of reasons involving the inability to parse input parameter 'ws'.

      • consume

        🡅  ⇈  ⮫ 🗕  🗗  🗖 
        protected static void consume​
            (int[] css,
             ByRef<java.lang.Integer> POS,
             java.util.function.Consumer<CSSToken> returnParsedToken)
        This is a tokenizer method which "consumes" as much white-space as possible for the purpose of building a Whitespace Token.

        Tokenizer: Whitespace-Token Consume Method, Pseudo-Code

        Making use of the CSS Parser DOES NOT require any knowledge of how the underlying Pass 1 Tokenizer actually works. Below is the CSS Working Group's Whitespace-Token Rail-Road Diagram. It is here for informational purposes.
        These Parsing Pseudo-Code Instructions and Rail-Road Diagrams have been copied, verbatim, from the CSS-Working-Group Web-Site:
        https://drafts.csswg.org/css-syntax/#whitespace-token-diagram
        ws*
        <whitespace-token>
        whitespace
        space \t newline
        <whitespace-token>
        whitespace