Package jflex.generator

Class PackEmitter

  • Direct Known Subclasses:
    CountEmitter, HiLowEmitter
    public abstract class PackEmitter
extends java.lang.Object
    Encodes int arrays as strings.

    Also splits up strings when longer than 64K in UTF8 encoding. Subclasses emit unpacking code.

    Usage protocol: p.emitInit();
    for each data: p.emitData(data);
    p.emitUnpack();

    Version:
    JFlex 1.9.1

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected int chunks
      number of existing string chunks
      private static java.lang.String indent
      indent for string lines
      private int linepos
      position in the current line
      private static int maxEntries
      max number of entries per line
      private static int maxSize
      maximum size of chunks
      protected java.lang.String name
      name of the generated array (mixed case, no yy prefix)
      protected java.lang.StringBuilder out
      output buffer
      private int UTF8Length
      current UTF8 length of generated string in current chunk

    • Constructor Summary

      Constructors 
      Constructor Description
      PackEmitter​(java.lang.String name)
      Create new emitter for an array.

    • Method Summary

      All Methods Static Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      void breaks()
      Execute line/chunk break if necessary.
      protected java.lang.String constName()
      Convert array name into all uppercase internal scanner constant name.
      void emitInit()
      Emit declaration of decoded member and open first chunk.
      void emitUC​(int i)
      Emit single unicode character.
      abstract void emitUnpack()
      Emit the unpacking code.
      private void nextChunk()
      emit next chunk
      protected void nl()
      emit newline
      protected void println​(java.lang.String s)
      println.
      private void printUC​(char c)
      Append a unicode/octal escaped character to out buffer.
      java.lang.String toString()
      Return current output buffer.
      private static int Utf8Length​(int value)
      Calculates the number of bytes a Unicode character would have in UTF8 representation in a class file.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • name

        protected java.lang.String name
        name of the generated array (mixed case, no yy prefix)

      • UTF8Length

        private int UTF8Length
        current UTF8 length of generated string in current chunk

      • linepos

        private int linepos
        position in the current line

      • maxEntries

        private static final int maxEntries
        max number of entries per line
        See Also:
        Constant Field Values

      • out

        protected java.lang.StringBuilder out
        output buffer

      • chunks

        protected int chunks
        number of existing string chunks

      • indent

        private static final java.lang.String indent
        indent for string lines
        See Also:
        Constant Field Values

    • Constructor Detail

      • PackEmitter

        public PackEmitter​(java.lang.String name)
        Create new emitter for an array.
        Parameters:
        name - the name of the generated array

    • Method Detail

      • constName

        protected java.lang.String constName()
        Convert array name into all uppercase internal scanner constant name.
        Returns:
        name as a internal constant name.
        See Also:
        name

      • toString

        public java.lang.String toString()
        Return current output buffer.
        Overrides:
        toString in class java.lang.Object
        Returns:
        a String object.

      • emitInit

        public void emitInit()
        Emit declaration of decoded member and open first chunk.

      • emitUC

        public void emitUC​(int i)
        Emit single unicode character.

        Updates length, position, etc.

        Parameters:
        i - the character to emit.

      • breaks

        public void breaks()
        Execute line/chunk break if necessary. Leave space for at least two chars.

      • emitUnpack

        public abstract void emitUnpack()
        Emit the unpacking code.

      • nextChunk

        private void nextChunk()
        emit next chunk

      • nl

        protected void nl()
        emit newline

      • printUC

        private void printUC​(char c)
        Append a unicode/octal escaped character to out buffer.
        Parameters:
        c - the character to append

      • Utf8Length

        private static int Utf8Length​(int value)
        Calculates the number of bytes a Unicode character would have in UTF8 representation in a class file.
        Parameters:
        value - the char code of the Unicode character
        Returns:
        length of UTF8 representation.

      • println

        protected void println​(java.lang.String s)
        println.
        Parameters:
        s - a String object.