Class JsonTokenMaker

java.lang.Object
org.fife.ui.rsyntaxtextarea.TokenMakerBase
org.fife.ui.rsyntaxtextarea.AbstractJFlexTokenMaker
org.fife.ui.rsyntaxtextarea.AbstractJFlexCTokenMaker
org.fife.ui.rsyntaxtextarea.modes.JsonTokenMaker
All Implemented Interfaces:
TokenMaker
Direct Known Subclasses:
JshintrcTokenMaker
public class JsonTokenMaker extends AbstractJFlexCTokenMaker
Scanner for JSON.

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 JsonTokenMaker.java file will contain two 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.
Version:
0.6
Author:
Robert Futrell

  • Field Details

  • Constructor Details

    • JsonTokenMaker

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

    • JsonTokenMaker

      public JsonTokenMaker(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.

    • JsonTokenMaker

      public JsonTokenMaker(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 Details

    • addToken

      public void addToken(char[] array, int start, int end, int tokenType, int startOffset, boolean hyperlink)
      Adds the token specified to the current linked list of tokens.
      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.
      hyperlink - Whether this token is a hyperlink.

    • getCurlyBracesDenoteCodeBlocks

      public boolean getCurlyBracesDenoteCodeBlocks()
      Returns true always as C-style languages use curly braces to denote code blocks.
      Returns:
      true always.

    • getMarkOccurrencesOfTokenType

      public boolean getMarkOccurrencesOfTokenType(int type)
      Description copied from class: TokenMakerBase
      Returns whether tokens of the specified type should have "mark occurrences" enabled for the current programming language. The default implementation returns true if type is TokenTypes.IDENTIFIER. Subclasses can override this method to support other token types, such as TokenTypes.VARIABLE.
      Specified by:
      getMarkOccurrencesOfTokenType in interface TokenMaker
      Overrides:
      getMarkOccurrencesOfTokenType in class AbstractJFlexCTokenMaker
      Parameters:
      type - The token type.
      Returns:
      Whether tokens of this type should have "mark occurrences" enabled.

    • getShouldIndentNextLineAfter

      public boolean getShouldIndentNextLineAfter(Token t)
      Description copied from class: TokenMakerBase
      The default implementation returns false always. Languages that wish to better support auto-indentation can override this method.
      Specified by:
      getShouldIndentNextLineAfter in interface TokenMaker
      Overrides:
      getShouldIndentNextLineAfter in class AbstractJFlexCTokenMaker
      Parameters:
      t - The token the previous line ends with.
      Returns:
      Whether the next line should be indented.

    • 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.

    • setHighlightEolComments

      protected void setHighlightEolComments(boolean highlightEolComments)

    • 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

    • yyclose

      public final void yyclose() throws IOException
      Closes the input stream.
      Specified by:
      yyclose in class AbstractJFlexTokenMaker
      Throws:
      IOException - If an IO error occurs.

    • 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.
      Specified by:
      yytext in class AbstractJFlexTokenMaker

    • 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