Added source for ByteEdit

src/org/fife/ui/rsyntaxtextarea/modes/HostsTokenMaker.flex

@@ -0,0 +1,256 @@
+/*
+ * 10/17/2015
+ *
+ * This library is distributed under a modified BSD license.  See the included
+ * RSyntaxTextArea.License.txt file for details.
+ */
+package org.fife.ui.rsyntaxtextarea.modes;
+
+import java.io.*;
+import javax.swing.text.Segment;
+
+import org.fife.ui.rsyntaxtextarea.*;
+
+
+/**
+ * Scanner for hosts files.<p>
+ *
+ * This implementation was created using
+ * <a href="http://www.jflex.de/">JFlex</a> 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 <code>AbstractTokenMaker</code>, 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.<p>
+ *
+ * The actual algorithm generated for scanning has, of course, not been
+ * modified.<p>
+ *
+ * If you wish to regenerate this file yourself, keep in mind the following:
+ * <ul>
+ *   <li>The generated <code>HostsTokenMaker.java</code> file will contain two
+ *       definitions of both <code>zzRefill</code> and <code>yyreset</code>.
+ *       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.</li>
+ *   <li>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.</li>
+ *   <li>You should NOT call <code>yylex()</code> on the generated scanner
+ *       directly; rather, you should use <code>getTokenList</code> as you would
+ *       with any other <code>TokenMaker</code> instance.</li>
+ * </ul>
+ *
+ * @author Robert Futrell
+ * @version 0.5
+ *
+ */
+%%
+
+%public
+%class HostsTokenMaker
+%extends AbstractJFlexTokenMaker
+%unicode
+%type org.fife.ui.rsyntaxtextarea.Token
+
+
+%{
+
+	/**
+	 * Whether or not this is the first token on a line.
+	 */
+	private boolean first;
+
+
+	/**
+	 * Constructor.  This must be here because JFlex does not generate a
+	 * no-parameter constructor.
+	 */
+	public HostsTokenMaker() {
+	}
+
+
+	/**
+	 * Adds the token specified to the current linked list of tokens.
+	 *
+	 * @param tokenType The token's type.
+	 * @see #addToken(int, int, int)
+	 */
+	private void addHyperlinkToken(int start, int end, int tokenType) {
+		int so = start + offsetShift;
+		addToken(zzBuffer, start,end, tokenType, so, true);
+	}
+
+
+	/**
+	 * Adds the token specified to the current linked list of tokens.
+	 *
+	 * @param tokenType The token's type.
+	 */
+	private void addToken(int tokenType) {
+		addToken(zzStartRead, zzMarkedPos-1, tokenType);
+	}
+
+
+	/**
+	 * Adds the token specified to the current linked list of tokens.
+	 *
+	 * @param tokenType The token's type.
+	 */
+	private void addToken(int start, int end, int tokenType) {
+		int so = start + offsetShift;
+		addToken(zzBuffer, start,end, tokenType, so);
+	}
+
+
+	/**
+	 * Adds the token specified to the current linked list of tokens.
+	 *
+	 * @param array The character array.
+	 * @param start The starting offset in the array.
+	 * @param end The ending offset in the array.
+	 * @param tokenType The token's type.
+	 * @param startOffset The offset in the document at which this token
+	 *                    occurs.
+	 */
+	@Override
+	public void addToken(char[] array, int start, int end, int tokenType, int startOffset) {
+		super.addToken(array, start,end, tokenType, startOffset);
+		zzStartRead = zzMarkedPos;
+	}
+
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public String[] getLineCommentStartAndEnd(int languageIndex) {
+		return new String[] { "#", null };
+	}
+
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public boolean getMarkOccurrencesOfTokenType(int type) {
+		return type == Token.RESERVED_WORD;
+	}
+
+
+	/**
+	 * Returns the first token in the linked list of tokens generated
+	 * from <code>text</code>.  This method must be implemented by
+	 * subclasses so they can correctly implement syntax highlighting.
+	 *
+	 * @param text The text from which to get tokens.
+	 * @param initialTokenType The token type we should start with.
+	 * @param startOffset The offset into the document at which
+	 *        <code>text</code> starts.
+	 * @return The first <code>Token</code> in a linked list representing
+	 *         the syntax highlighted text.
+	 */
+	public Token getTokenList(Segment text, int initialTokenType, int startOffset) {
+
+		resetTokenList();
+		this.offsetShift = -text.offset + startOffset;
+		first = true;
+
+		// Start off in the proper state.
+		int state = YYINITIAL;
+
+		s = text;
+		try {
+			yyreset(zzReader);
+			yybegin(state);
+			return yylex();
+		} catch (IOException ioe) {
+			ioe.printStackTrace();
+			return new TokenImpl();
+		}
+
+	}
+
+
+	/**
+	 * Refills the input buffer.
+	 *
+	 * @return      <code>true</code> if EOF was reached, otherwise
+	 *              <code>false</code>.
+	 */
+	private boolean zzRefill() {
+		return zzCurrentPos>=s.offset+s.count;
+	}
+
+
+	/**
+	 * 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 
+	 * <b>cannot</b> be reused (internal buffer is discarded and lost).
+	 * Lexical state is set to <tt>YY_INITIAL</tt>.
+	 *
+	 * @param reader   the new input stream 
+	 */
+	public final void yyreset(java.io.Reader reader) {
+		// 's' has been updated.
+		zzBuffer = s.array;
+		/*
+		 * We replaced the line below with the two below it because zzRefill
+		 * no longer "refills" the buffer (since the way we do it, it's always
+		 * "full" the first time through, since it points to the segment's
+		 * array).  So, we assign zzEndRead here.
+		 */
+		//zzStartRead = zzEndRead = s.offset;
+		zzStartRead = s.offset;
+		zzEndRead = zzStartRead + s.count - 1;
+		zzCurrentPos = zzMarkedPos = zzPushbackPos = s.offset;
+		zzLexicalState = YYINITIAL;
+		zzReader = reader;
+		zzAtBOL  = true;
+		zzAtEOF  = false;
+	}
+
+
+%}
+
+Identifier					= ([^# \t\n]+)
+Whitespace					= ([ \t]+)
+LineCommentBegin			= "#"
+
+URLGenDelim				= ([:\/\?#\[\]@])
+URLSubDelim				= ([\!\$&'\(\)\*\+,;=])
+URLUnreserved			= ([A-Za-z0-9_\-\.\~])
+URLCharacter			= ({URLGenDelim}|{URLSubDelim}|{URLUnreserved}|[%])
+URLCharacters			= ({URLCharacter}*)
+URLEndCharacter			= ([\/\$A-Za-z0-9])
+URL						= (((https?|f(tp|ile))"://"|"www.")({URLCharacters}{URLEndCharacter})?)
+
+%state EOL_COMMENT
+
+%%
+
+<YYINITIAL> {
+	{Identifier}			{
+								addToken(first ? Token.RESERVED_WORD : Token.IDENTIFIER);
+								first = false;
+							}
+	{Whitespace}			{ addToken(Token.WHITESPACE); }
+	{LineCommentBegin}		{ start = zzMarkedPos-1; yybegin(EOL_COMMENT); }
+	\n |
+	<<EOF>>					{ addNullToken(); return firstToken; }
+}
+
+<EOL_COMMENT> {
+	[^hwf\n]+				{}
+	{URL}					{ int temp=zzStartRead; addToken(start,zzStartRead-1, Token.COMMENT_EOL); addHyperlinkToken(temp,zzMarkedPos-1, Token.COMMENT_EOL); start = zzMarkedPos; }
+	[hwf]					{}
+	\n |
+	<<EOF>>					{ addToken(start,zzStartRead-1, Token.COMMENT_EOL); addNullToken(); return firstToken; }
+}