package cute.gui;
import javax.swing.text.*;
import java.awt.*;
import java.util.HashSet;
class SyntaxDocument extends DefaultStyledDocument
{
/**
*
*/
private static final long serialVersionUID = -7769679231134742008L;
private DefaultStyledDocument doc;
private Element rootElement;
private boolean multiLineComment;
private MutableAttributeSet normal;
private MutableAttributeSet keyword;
private MutableAttributeSet comment;
private MutableAttributeSet quote;
private HashSet keywords;
public SyntaxDocument()
{
doc = this;
rootElement = doc.getDefaultRootElement();
putProperty( DefaultEditorKit.EndOfLineStringProperty, "\n" );
normal = new SimpleAttributeSet();
StyleConstants.setForeground(normal, Color.black);
comment = new SimpleAttributeSet();
StyleConstants.setForeground(comment, Color.gray);
StyleConstants.setItalic(comment, true);
keyword = new SimpleAttributeSet();
StyleConstants.setForeground(keyword, Color.blue);
quote = new SimpleAttributeSet();
StyleConstants.setForeground(quote, Color.red);
keywords = new HashSet();
keywords.add( "abstract" );
keywords.add( "boolean" );
keywords.add( "break" );
keywords.add( "byte" );
keywords.add( "byvalue" );
keywords.add( "case" );
keywords.add( "cast" );
keywords.add( "catch" );
keywords.add( "char" );
keywords.add( "class" );
keywords.add( "const" );
keywords.add( "continue" );
keywords.add( "default" );
keywords.add( "do" );
keywords.add( "double" );
keywords.add( "else" );
keywords.add( "extends" );
keywords.add( "false" );
keywords.add( "final" );
keywords.add( "finally" );
keywords.add( "float" );
keywords.add( "for" );
keywords.add( "future" );
keywords.add( "generic" );
keywords.add( "goto" );
keywords.add( "if" );
keywords.add( "implements" );
keywords.add( "import" );
keywords.add( "inner" );
keywords.add( "instanceof" );
keywords.add( "int" );
keywords.add( "interface" );
keywords.add( "long" );
keywords.add( "native" );
keywords.add( "new" );
keywords.add( "null" );
keywords.add( "operator" );
keywords.add( "outer" );
keywords.add( "package" );
keywords.add( "private" );
keywords.add( "protected" );
keywords.add( "public" );
keywords.add( "rest" );
keywords.add( "return" );
keywords.add( "short" );
keywords.add( "static" );
keywords.add( "super" );
keywords.add( "switch" );
keywords.add( "synchronized" );
keywords.add( "this" );
keywords.add( "throw" );
keywords.add( "throws" );
keywords.add( "transient" );
keywords.add( "true" );
keywords.add( "try" );
keywords.add( "var" );
keywords.add( "void" );
keywords.add( "volatile" );
keywords.add( "while" );
}
/*
* Override to apply syntax highlighting after the document has been updated
*/
public void insertString(int offset, String str, AttributeSet a) throws BadLocationException
{
if (str.equals("{"))
str = addMatchingBrace(offset);
super.insertString(offset, str, a);
processChangedLines(offset, str.length());
}
/*
* Override to apply syntax highlighting after the document has been updated
*/
public void remove(int offset, int length) throws BadLocationException
{
super.remove(offset, length);
processChangedLines(offset, 0);
}
/*
* Determine how many lines have been changed,
* then apply highlighting to each line
*/
public void processChangedLines(int offset, int length)
throws BadLocationException
{
String content = doc.getText(0, doc.getLength());
// The lines affected by the latest document update
int startLine = rootElement.getElementIndex( offset );
int endLine = rootElement.getElementIndex( offset + length );
// Make sure all comment lines prior to the start line are commented
// and determine if the start line is still in a multi line comment
setMultiLineComment( commentLinesBefore( content, startLine ) );
// Do the actual highlighting
for (int i = startLine; i <= endLine; i++)
{
applyHighlighting(content, i);
}
// Resolve highlighting to the next end multi line delimiter
if (isMultiLineComment())
commentLinesAfter(content, endLine);
else
highlightLinesAfter(content, endLine);
}
/*
* Highlight lines when a multi line comment is still 'open'
* (ie. matching end delimiter has not yet been encountered)
*/
private boolean commentLinesBefore(String content, int line)
{
int offset = rootElement.getElement( line ).getStartOffset();
// Start of comment not found, nothing to do
int startDelimiter = lastIndexOf( content, getStartDelimiter(), offset - 2 );
if (startDelimiter < 0)
return false;
// Matching start/end of comment found, nothing to do
int endDelimiter = indexOf( content, getEndDelimiter(), startDelimiter );
if (endDelimiter < offset & endDelimiter != -1)
return false;
// End of comment not found, highlight the lines
doc.setCharacterAttributes(startDelimiter, offset - startDelimiter + 1, comment, false);
return true;
}
/*
* Highlight comment lines to matching end delimiter
*/
private void commentLinesAfter(String content, int line)
{
int offset = rootElement.getElement( line ).getEndOffset();
// End of comment not found, nothing to do
int endDelimiter = indexOf( content, getEndDelimiter(), offset );
if (endDelimiter < 0)
return;
// Matching start/end of comment found, comment the lines
int startDelimiter = lastIndexOf( content, getStartDelimiter(), endDelimiter );
if (startDelimiter < 0 || startDelimiter <= offset)
{
doc.setCharacterAttributes(offset, endDelimiter - offset + 1, comment, false);
}
}
/*
* Highlight lines to start or end delimiter
*/
private void highlightLinesAfter(String content, int line)
throws BadLocationException
{
int offset = rootElement.getElement( line ).getEndOffset();
// Start/End delimiter not found, nothing to do
int startDelimiter = indexOf( content, getStartDelimiter(), offset );
int endDelimiter = indexOf( content, getEndDelimiter(), offset );
if (startDelimiter < 0)
startDelimiter = content.length();
if (endDelimiter < 0)
endDelimiter = content.length();
int delimiter = Math.min(startDelimiter, endDelimiter);
if (delimiter < offset)
return;
// Start/End delimiter found, reapply highlighting
int endLine = rootElement.getElementIndex( delimiter );
for (int i = line + 1; i < endLine; i++)
{
Element branch = rootElement.getElement( i );
Element leaf = doc.getCharacterElement( branch.getStartOffset() );
AttributeSet as = leaf.getAttributes();
if ( as.isEqual(comment) )
applyHighlighting(content, i);
}
}
/*
* Parse the line to determine the appropriate highlighting
*/
private void applyHighlighting(String content, int line)
throws BadLocationException
{
int startOffset = rootElement.getElement( line ).getStartOffset();
int endOffset = rootElement.getElement( line ).getEndOffset() - 1;
int lineLength = endOffset - startOffset;
int contentLength = content.length();
if (endOffset >= contentLength)
endOffset = contentLength - 1;
// check for multi line comments
// (always set the comment attribute for the entire line)
if (endingMultiLineComment(content, startOffset, endOffset)
|| isMultiLineComment()
|| startingMultiLineComment(content, startOffset, endOffset) )
{
doc.setCharacterAttributes(startOffset, endOffset - startOffset + 1, comment, false);
return;
}
// set normal attributes for the line
doc.setCharacterAttributes(startOffset, lineLength, normal, true);
// check for single line comment
int index = content.indexOf(getSingleLineDelimiter(), startOffset);
if ( (index > -1) && (index < endOffset) )
{
doc.setCharacterAttributes(index, endOffset - index + 1, comment, false);
endOffset = index - 1;
}
// check for tokens
checkForTokens(content, startOffset, endOffset);
}
/*
* Does this line contain the start delimiter
*/
private boolean startingMultiLineComment(String content, int startOffset, int endOffset)
throws BadLocationException
{
int index = indexOf( content, getStartDelimiter(), startOffset );
if ( (index < 0) || (index > endOffset) )
return false;
else
{
setMultiLineComment( true );
return true;
}
}
/*
* Does this line contain the end delimiter
*/
private boolean endingMultiLineComment(String content, int startOffset, int endOffset)
throws BadLocationException
{
int index = indexOf( content, getEndDelimiter(), startOffset );
if ( (index < 0) || (index > endOffset) )
return false;
else
{
setMultiLineComment( false );
return true;
}
}
/*
* We have found a start delimiter
* and are still searching for the end delimiter
*/
private boolean isMultiLineComment()
{
return multiLineComment;
}
private void setMultiLineComment(boolean value)
{
multiLineComment = value;
}
/*
* Parse the line for tokens to highlight
*/
private void checkForTokens(String content, int startOffset, int endOffset)
{
while (startOffset <= endOffset)
{
// skip the delimiters to find the start of a new token
while ( isDelimiter( content.substring(startOffset, startOffset + 1) ) )
{
if (startOffset < endOffset)
startOffset++;
else
return;
}
// Extract and process the entire token
if ( isQuoteDelimiter( content.substring(startOffset, startOffset + 1) ) )
startOffset = getQuoteToken(content, startOffset, endOffset);
else
startOffset = getOtherToken(content, startOffset, endOffset);
}
}
/*
*
*/
private int getQuoteToken(String content, int startOffset, int endOffset)
{
String quoteDelimiter = content.substring(startOffset, startOffset + 1);
String escapeString = getEscapeString(quoteDelimiter);
int index;
int endOfQuote = startOffset;
// skip over the escape quotes in this quote
index = content.indexOf(escapeString, endOfQuote + 1);
while ( (index > -1) && (index < endOffset) )
{
endOfQuote = index + 1;
index = content.indexOf(escapeString, endOfQuote);
}
// now find the matching delimiter
index = content.indexOf(quoteDelimiter, endOfQuote + 1);
if ( (index < 0) || (index > endOffset) )
endOfQuote = endOffset;
else
endOfQuote = index;
doc.setCharacterAttributes(startOffset, endOfQuote - startOffset + 1, quote, false);
return endOfQuote + 1;
}
/*
*
*/
private int getOtherToken(String content, int startOffset, int endOffset)
{
int endOfToken = startOffset + 1;
while ( endOfToken <= endOffset )
{
if ( isDelimiter( content.substring(endOfToken, endOfToken + 1) ) )
break;
endOfToken++;
}
String token = content.substring(startOffset, endOfToken);
if ( isKeyword( token ) )
{
doc.setCharacterAttributes(startOffset, endOfToken - startOffset, keyword, false);
}
return endOfToken + 1;
}
/*
* Assume the needle will the found at the start/end of the line
*/
private int indexOf(String content, String needle, int offset)
{
int index;
while ( (index = content.indexOf(needle, offset)) != -1 )
{
String text = getLine( content, index ).trim();
if (text.startsWith(needle) || text.endsWith(needle))
break;
else
offset = index + 1;
}
return index;
}
/*
* Assume the needle will the found at the start/end of the line
*/
private int lastIndexOf(String content, String needle, int offset)
{
int index;
while ( (index = content.lastIndexOf(needle, offset)) != -1 )
{
String text = getLine( content, index ).trim();
if (text.startsWith(needle) || text.endsWith(needle))
break;
else
offset = index - 1;
}
return index;
}
private String getLine(String content, int offset)
{
int line = rootElement.getElementIndex( offset );
Element lineElement = rootElement.getElement( line );
int start = lineElement.getStartOffset();
int end = lineElement.getEndOffset();
return content.substring(start, end - 1);
}
/*
* Override for other languages
*/
protected boolean isDelimiter(String character)
{
String operands = ";:{}()[]+-/%<=>!&|^~*";
if (Character.isWhitespace( character.charAt(0) ) ||
operands.indexOf(character) != -1 )
return true;
else
return false;
}
/*
* Override for other languages
*/
protected boolean isQuoteDelimiter(String character)
{
String quoteDelimiters = "\"'";
if (quoteDelimiters.indexOf(character) < 0)
return false;
else
return true;
}
/*
* Override for other languages
*/
protected boolean isKeyword(String token)
{
return keywords.contains( token );
}
/*
* Override for other languages
*/
protected String getStartDelimiter()
{
return "/*";
}
/*
* Override for other languages
*/
protected String getEndDelimiter()
{
return "*/";
}
/*
* Override for other languages
*/
protected String getSingleLineDelimiter()
{
return "//";
}
/*
* Override for other languages
*/
protected String getEscapeString(String quoteDelimiter)
{
return "\\" + quoteDelimiter;
}
/*
*
*/
protected String addMatchingBrace(int offset) throws BadLocationException
{
StringBuffer whiteSpace = new StringBuffer();
int line = rootElement.getElementIndex( offset );
int i = rootElement.getElement(line).getStartOffset();
while (true)
{
String temp = doc.getText(i, 1);
if (temp.equals(" ") || temp.equals("\t"))
{
whiteSpace.append(temp);
i++;
}
else
break;
}
return "{\n" + whiteSpace.toString() + "\t\n" + whiteSpace.toString() + "}";
}
}