javawebparts.filter
Class JSMin

java.lang.Object
  |
  +--javawebparts.filter.JSMin

public class JSMin

extends java.lang.Object

This class is used to do compression.

Author:

Herman van Rosmalen .

Nested Class Summary

(package private) class	JSMin.UnterminatedCommentException This class is thrown when a Comment is not terminated correctly.
(package private) class	JSMin.UnterminatedRegExpLiteralException This class is thrown when a RegExp is not terminated correctly.
(package private) class	JSMin.UnterminatedStringLiteralException This class is thrown when a String is not terminated correctly.

Field Summary

private static int	EOF
private java.io.PushbackInputStream	in
private java.lang.StringBuffer	out
private int	theA
private int	theB

Constructor Summary

JSMin()
Constructor

Method Summary

(package private) void	action(int d) action -- do something.
java.lang.String	compress(java.lang.String text) compress -- Copy the input to the output, deleting the characters which are insignificant to JavaScript.
(package private) int	get() get -- return the next character from stdin.
(package private) static boolean	isAlphanum(int c) isAlphanum -- return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character.
(package private) int	next() This method gets the next character, excluding comments.
(package private) int	peek() Get the next character without getting it.

Methods inherited from class java.lang.Object

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

Field Detail

EOF

private static final int EOF

See Also:

Constant Field Values

in

private java.io.PushbackInputStream in

out

private java.lang.StringBuffer out

theA

private int theA

theB

private int theB

Constructor Detail

JSMin

public JSMin()

Constructor

Method Detail

isAlphanum

static boolean isAlphanum(int c)

isAlphanum -- return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character.

Parameters:

c - the character from the input as an int.

Returns:

boolean true if it is alphanumeric else false.

get

int get()
  throws java.io.IOException

get -- return the next character from stdin. Watch out for lookahead. If the character is a control character, translate it to a space or linefeed.

Returns:

int the next character as int.

Throws:

java.io.IOException - IOException.

peek

int peek()
   throws java.io.IOException

Get the next character without getting it.

Returns:

int the next character as int.

Throws:

java.io.IOException - IOException.

next

int next()
   throws JSMin.UnterminatedCommentException,
          java.io.IOException

This method gets the next character, excluding comments. peek() is used to see if a '/' is followed by a '/' or '*'.

Returns:

int the next character as int.

Throws:

JSMin.UnterminatedCommentException - UnterminatedCommentException.

java.io.IOException - IOException.

action

void action(int d)
      throws java.io.IOException,
             JSMin.UnterminatedRegExpLiteralException,
             JSMin.UnterminatedCommentException,
             JSMin.UnterminatedStringLiteralException

action -- do something. What you do is determined by the argument: 1 Output A. Copy B to A. Get the next B. 2 Copy B to A. Get the next B. (Delete A). 3 Get the next B. (Delete B). action treats a string as a single character. Wow! action recognizes a regular expression if it is preceded by ( or , or =.

Parameters:

d - Type of action (see above).

Throws:

java.io.IOException - IOException.

JSMin.UnterminatedRegExpLiteralException - UnterminatedRegExpLiteralException.

JSMin.UnterminatedCommentException - UnterminatedCommentException.

JSMin.UnterminatedStringLiteralException - UnterminatedStringLiteralException.

compress

public java.lang.String compress(java.lang.String text)
                          throws java.io.IOException,
                                 JSMin.UnterminatedRegExpLiteralException,
                                 JSMin.UnterminatedCommentException,
                                 JSMin.UnterminatedStringLiteralException

compress -- Copy the input to the output, deleting the characters which are insignificant to JavaScript. Comments will be removed. Tabs will be replaced with spaces. Carriage returns will be replaced with linefeeds. Most spaces and linefeeds will be removed.

Parameters:

text - The text to compress.

Returns:

String The compressed text.

Throws:

java.io.IOException - IOException.

JSMin.UnterminatedRegExpLiteralException - UnterminatedRegExpLiteralException.

JSMin.UnterminatedCommentException - UnterminatedCommentException.

JSMin.UnterminatedStringLiteralException - UnterminatedStringLiteralException.