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Java Source Code / Java Documentation » Web Server » simple » simple.page.translate 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   simple.page.translate.Tokenizer

Tokenizer
final class Tokenizer implements Lexer(Code)
The Tokenizer is used to extract valid tokens from the stream of bytes given to it for scanning. Identifying the tokens from the stream of input is done using delimiters to specify the start and end of a valid token. For example take the well known JSP syntax. A parsable segment typically opens using the following token <% and closes with the %>, as shown in the JSP text shown below.
 <%= new java.util.Date() %>
 
This tokenizer can be used to extract HTML expressions and other such formats by specifying the starting and ending of the expression. For example the following HTML could be used to specify the opening and closure of an valid token.
 <script language='groovy'>
 java.util.Date();
 </script>
 
The above token will be identified using a case insensitive match, and whitespace characters can be ignored, such that the HTML does not have to be formatted correctly in order for this tokenizer to extract the HTML as a valid token.
author:
   Niall Gallagher



Constructor Summary
public  Tokenizer(Parser parser)
     Constructor for the Tokenizer object.

Method Summary
public  voidmatch(String start, String finish)
     This method tells the lexer how to extract the tokens from the source document.
public  voidmatch(String start, String finish, String special)
     This method tells the lexer how to extract the tokens from the source document.
public  voidscan(char[] text)
     This will scan the provided bytes for tokens that should be emitted to the Parser.
public  voidscan(char[] text, int pos, int len)
     This will scan the provided bytes for tokens that should be emitted to the Parser.


Constructor Detail
Tokenizer
public Tokenizer(Parser parser)(Code)
Constructor for the Tokenizer object. This is used to scan a stream of bytes and pass any extracted tokens from the stream to the Parser.
Parameters:
  parser - the parser used to parse extracted tokens




Method Detail
match
public void match(String start, String finish)(Code)
This method tells the lexer how to extract the tokens from the source document. This is given the opening and closing tokens used to identify a segment. Typically with languages such as JSP and PHP code segments are opened with a delimiter like <% for JSP and <?php for PHP. This method allows the lexer to be configured to process such delimiters.
Parameters:
  start - this is the opening token for a segment
Parameters:
  finish - this is the closing token for a segment



match
public void match(String start, String finish, String special)(Code)
This method tells the lexer how to extract the tokens from the source document. This is given the opening and closing tokens used to identify a segment. Typically with languages such as JSP and PHP code segments are opened with a delimiter like <% for JSP and <?php for PHP. This method allows the lexer to be configured to process such delimiters.

With this match method a collection of special characters can be specified. These characters tell the lexer what it should allow whitespace to surround. For example take the HTML expressions below.

 <   script language ='groovy' >
 <script language='groovy'>
 
The above two HTML expressions should be considered equal using the special characters <, >, and =.
Parameters:
  start - this is the opening token for a segment
Parameters:
  finish - this is the closing token for a segment
Parameters:
  special - this is the set of special characters



scan
public void scan(char[] text)(Code)
This will scan the provided bytes for tokens that should be emitted to the Parser. The tokens emitted to the parser object are either plain text tokens or valid segments that require further processing by the parser.
Parameters:
  text - this is the buffer that contains the bytes



scan
public void scan(char[] text, int pos, int len)(Code)
This will scan the provided bytes for tokens that should be emitted to the Parser. The tokens emitted to the parser object are either plain text tokens or valid segments that require further processing by the parser.
Parameters:
  text - this is the buffer that contains the bytes
Parameters:
  pos - this is the offset within the buffer to read
Parameters:
  len - this is the number of bytes to use



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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