Package org.fife.ui.rsyntaxtextarea.modes

Class CSSTokenMaker

  • All Implemented Interfaces:
    TokenMaker
    Direct Known Subclasses:
    LessTokenMaker
    public class CSSTokenMaker
extends AbstractJFlexCTokenMaker
    This class splits up text into tokens representing a CSS 3 file. It's written with a few extra internal states so that it can easily be copy and pasted into HTML, PHP, and JSP TokenMakres when it is updated.

    This implementation was created using JFlex 1.4.1; however, the generated file was modified for performance. Memory allocation needs to be almost completely removed to be competitive with the handwritten lexers (subclasses of AbstractTokenMaker, so this class has been modified so that Strings are never allocated (via yytext()), and the scanner never has to worry about refilling its buffer (needlessly copying chars around). We can achieve this because RText always scans exactly 1 line of tokens at a time, and hands the scanner this line as an array of characters (a Segment really). Since tokens contain pointers to char arrays instead of Strings holding their contents, there is no need for allocating new memory for Strings.

    The actual algorithm generated for scanning has, of course, not been modified.

    If you wish to regenerate this file yourself, keep in mind the following:

    • The generated CSSTokenMaker.java file will contain 2 definitions of both zzRefill and yyreset. You should hand-delete the second of each definition (the ones generated by the lexer), as these generated methods modify the input buffer, which we'll never have to do.
    • You should also change the declaration/definition of zzBuffer to NOT be initialized. This is a needless memory allocation for us since we will be pointing the array somewhere else anyway.
    • You should NOT call yylex() on the generated scanner directly; rather, you should use getTokenList as you would with any other TokenMaker instance.

    • Field Detail

      • YYEOF

        public static final int YYEOF
        This character denotes the end of file
        See Also:
        Constant Field Values

      • CSS_C_STYLE_COMMENT

        public static final int CSS_C_STYLE_COMMENT
        lexical states
        See Also:
        Constant Field Values

      • INTERNAL_CSS_PROPERTY

        public static final int INTERNAL_CSS_PROPERTY
        Internal type denoting a line ending in a CSS property.
        See Also:
        Constant Field Values

      • INTERNAL_CSS_VALUE

        public static final int INTERNAL_CSS_VALUE
        Internal type denoting a line ending in a CSS property value.
        See Also:
        Constant Field Values

      • INTERNAL_CSS_STRING

        public static final int INTERNAL_CSS_STRING
        Internal type denoting line ending in a CSS double-quote string. The state to return to is embedded in the actual end token type.
        See Also:
        Constant Field Values

      • INTERNAL_CSS_CHAR

        public static final int INTERNAL_CSS_CHAR
        Internal type denoting line ending in a CSS single-quote string. The state to return to is embedded in the actual end token type.
        See Also:
        Constant Field Values

      • INTERNAL_CSS_MLC

        public static final int INTERNAL_CSS_MLC
        Internal type denoting line ending in a CSS multi-line comment. The state to return to is embedded in the actual end token type.
        See Also:
        Constant Field Values

    • Constructor Detail

      • CSSTokenMaker

        public CSSTokenMaker()
        Constructor. This must be here because JFlex does not generate a no-parameter constructor.

      • CSSTokenMaker

        public CSSTokenMaker​(Reader in)
        Creates a new scanner There is also a java.io.InputStream version of this constructor.
        Parameters:
        in - the java.io.Reader to read input from.

      • CSSTokenMaker

        public CSSTokenMaker​(InputStream in)
        Creates a new scanner. There is also java.io.Reader version of this constructor.
        Parameters:
        in - the java.io.Inputstream to read input from.

    • Method Detail

      • addToken

        public void addToken​(char[] array,
                     int start,
                     int end,
                     int tokenType,
                     int startOffset)
        Adds the token specified to the current linked list of tokens.
        Specified by:
        addToken in interface TokenMaker
        Overrides:
        addToken in class TokenMakerBase
        Parameters:
        array - The character array.
        start - The starting offset in the array.
        end - The ending offset in the array.
        tokenType - The token's type.
        startOffset - The offset in the document at which this token occurs.

      • getCurlyBracesDenoteCodeBlocks

        public boolean getCurlyBracesDenoteCodeBlocks()
        Returns true since CSS uses curly braces.
        Returns:
        true always.

      • getTokenList

        public Token getTokenList​(Segment text,
                          int initialTokenType,
                          int startOffset)
        Returns the first token in the linked list of tokens generated from text. This method must be implemented by subclasses so they can correctly implement syntax highlighting.
        Parameters:
        text - The text from which to get tokens.
        initialTokenType - The token type we should start with.
        startOffset - The offset into the document at which text starts.
        Returns:
        The first Token in a linked list representing the syntax highlighted text.

      • isIdentifierChar

        public boolean isIdentifierChar​(int languageIndex,
                                char ch)
        Overridden to accept letters, digits, underscores, and hyphens.
        Specified by:
        isIdentifierChar in interface TokenMaker
        Overrides:
        isIdentifierChar in class TokenMakerBase
        Parameters:
        languageIndex - The language index the character was found in.
        ch - The character.
        Returns:
        Whether the character could be part of an "identifier" token.

      • setHighlightingLess

        public void setHighlightingLess​(boolean highlightingLess)
        Toggles whether we're highlighting less instead of just CSS.
        Parameters:
        highlightingLess - Whether we're highlighting less.

      • yyreset

        public final void yyreset​(Reader reader)
        Resets the scanner to read from a new input stream. Does not close the old reader. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost). Lexical state is set to YY_INITIAL.
        Parameters:
        reader - the new input stream

      • yystate

        public final int yystate()
        Returns the current lexical state.

      • yybegin

        public final void yybegin​(int newState)
        Enters a new lexical state
        Specified by:
        yybegin in class AbstractJFlexTokenMaker
        Parameters:
        newState - the new lexical state

      • yytext

        public final String yytext()
        Returns the text matched by the current regular expression.

      • yycharat

        public final char yycharat​(int pos)
        Returns the character at position pos from the matched text. It is equivalent to yytext().charAt(pos), but faster
        Parameters:
        pos - the position of the character to fetch. A value from 0 to yylength()-1.
        Returns:
        the character at position pos

      • yylength

        public final int yylength()
        Returns the length of the matched text region.

      • yypushback

        public void yypushback​(int number)
        Pushes the specified amount of characters back into the input stream. They will be read again by then next call of the scanning method
        Parameters:
        number - the number of characters to be read again. This number must not be greater than yylength()!

      • yylex

        public Token yylex()
            throws IOException
        Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
        Returns:
        the next token
        Throws:
        IOException - if any I/O-Error occurs