/*! ******************************************************************************
*
* Pentaho Data Integration
*
* Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
*
*******************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.pentaho.di.ui.trans.steps.scriptvalues_mod;
import java.io.IOException;
import java.io.StringReader;
import java.util.Hashtable;
import java.util.Map;
import java.util.Vector;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.LineStyleEvent;
import org.eclipse.swt.custom.LineStyleListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
class ScriptValuesHighlight implements LineStyleListener {
JavaScanner scanner = new JavaScanner();
int[] tokenColors;
Color[] colors;
Vector<int[]> blockComments = new Vector<int[]>();
public static final int EOF = -1;
public static final int EOL = 10;
public static final int WORD = 0;
public static final int WHITE = 1;
public static final int KEY = 2;
public static final int COMMENT = 3; // single line comment: //
public static final int STRING = 5;
public static final int OTHER = 6;
public static final int NUMBER = 7;
public static final int FUNCTIONS = 8;
public static final int MAXIMUM_TOKEN = 9;
public ScriptValuesHighlight() {
initializeColors();
scanner = new JavaScanner();
}
public ScriptValuesHighlight( String[] strArrETLFunctions ) {
initializeColors();
scanner = new JavaScanner();
scanner.setETLKeywords( strArrETLFunctions );
scanner.initializeETLFunctions();
}
Color getColor( int type ) {
if ( type < 0 || type >= tokenColors.length ) {
return null;
}
return colors[tokenColors[type]];
}
boolean inBlockComment( int start, int end ) {
for ( int i = 0; i < blockComments.size(); i++ ) {
int[] offsets = blockComments.elementAt( i );
// start of comment in the line
if ( ( offsets[0] >= start ) && ( offsets[0] <= end ) ) {
return true;
}
// end of comment in the line
if ( ( offsets[1] >= start ) && ( offsets[1] <= end ) ) {
return true;
}
if ( ( offsets[0] <= start ) && ( offsets[1] >= end ) ) {
return true;
}
}
return false;
}
void initializeColors() {
Display display = Display.getDefault();
colors = new Color[] { new Color( display, new RGB( 0, 0, 0 ) ), // black
new Color( display, new RGB( 63, 127, 95 ) ), // red
new Color( display, new RGB( 0, 0, 192 ) ), // green
new Color( display, new RGB( 127, 0, 85 ) ), // blue
new Color( display, new RGB( 255, 102, 0 ) ) // Kettle Functions / Orange
};
tokenColors = new int[MAXIMUM_TOKEN];
tokenColors[WORD] = 0;
tokenColors[WHITE] = 0;
tokenColors[KEY] = 3;
tokenColors[COMMENT] = 1;
tokenColors[STRING] = 2;
tokenColors[OTHER] = 0;
tokenColors[NUMBER] = 0;
tokenColors[FUNCTIONS] = 4;
}
void disposeColors() {
for ( int i = 0; i < colors.length; i++ ) {
colors[i].dispose();
}
}
/**
* Event.detail line start offset (input) Event.text line text (input) LineStyleEvent.styles Enumeration of
* StyleRanges, need to be in order. (output) LineStyleEvent.background line background color (output)
*/
public void lineGetStyle( LineStyleEvent event ) {
Vector<StyleRange> styles = new Vector<StyleRange>();
int token;
StyleRange lastStyle;
if ( inBlockComment( event.lineOffset, event.lineOffset + event.lineText.length() ) ) {
styles.addElement( new StyleRange( event.lineOffset, event.lineText.length() + 4, colors[2], null ) );
event.styles = new StyleRange[styles.size()];
styles.copyInto( event.styles );
return;
}
scanner.setRange( event.lineText );
String xs = ( (StyledText) event.widget ).getText();
if ( xs != null ) {
parseBlockComments( xs );
}
token = scanner.nextToken();
while ( token != EOF ) {
if ( token != OTHER ) {
if ( ( token == WHITE ) && ( !styles.isEmpty() ) ) {
int start = scanner.getStartOffset() + event.lineOffset;
lastStyle = styles.lastElement();
if ( lastStyle.fontStyle != SWT.NORMAL ) {
if ( lastStyle.start + lastStyle.length == start ) {
// have the white space take on the style before it to minimize font style
// changes
lastStyle.length += scanner.getLength();
}
}
} else {
Color color = getColor( token );
if ( color != colors[0] ) { // hardcoded default foreground color, black
StyleRange style =
new StyleRange( scanner.getStartOffset() + event.lineOffset, scanner.getLength(), color, null );
if ( token == KEY ) {
style.fontStyle = SWT.BOLD;
}
if ( styles.isEmpty() ) {
styles.addElement( style );
} else {
lastStyle = styles.lastElement();
if ( lastStyle.similarTo( style ) && ( lastStyle.start + lastStyle.length == style.start ) ) {
lastStyle.length += style.length;
} else {
styles.addElement( style );
}
}
}
}
}
token = scanner.nextToken();
}
event.styles = new StyleRange[styles.size()];
styles.copyInto( event.styles );
}
public void parseBlockComments( String text ) {
blockComments = new Vector<int[]>();
StringReader buffer = new StringReader( text );
int ch;
boolean blkComment = false;
int cnt = 0;
int[] offsets = new int[2];
boolean done = false;
try {
while ( !done ) {
switch ( ch = buffer.read() ) {
case -1: {
if ( blkComment ) {
offsets[1] = cnt;
blockComments.addElement( offsets );
}
done = true;
break;
}
case '/': {
ch = buffer.read();
if ( ( ch == '*' ) && ( !blkComment ) ) {
offsets = new int[2];
offsets[0] = cnt;
blkComment = true;
cnt++;
} else {
cnt++;
}
cnt++;
break;
}
case '*': {
if ( blkComment ) {
ch = buffer.read();
cnt++;
if ( ch == '/' ) {
blkComment = false;
offsets[1] = cnt;
blockComments.addElement( offsets );
}
}
cnt++;
break;
}
default: {
cnt++;
break;
}
}
}
} catch ( IOException e ) {
// ignore errors
}
}
/**
* A simple fuzzy scanner for Java
*/
public class JavaScanner {
protected Map<String, Integer> fgKeys = null;
protected Map<?, ?> fgFunctions = null;
protected Map<String, Integer> kfKeys = null;
protected Map<?, ?> kfFunctions = null;
protected StringBuilder fBuffer = new StringBuilder();
protected String fDoc;
protected int fPos;
protected int fEnd;
protected int fStartToken;
protected boolean fEofSeen = false;
private String[] kfKeywords = { "num2str" };
private String[] fgKeywords = {
"array", "break", "case", "catch", "const", "continue", "Date", "default", "delete", "do", "else", "eval",
"escape", "false", "finally", "float", "for", "function", "if", "in", "instanceof", "isFinite", "isNaN",
"new", "Number", "null", "String", "switch", "this", "then", "throw", "to", "true", "try", "typeof",
"parseInt", "parseFloat", "return", "unescape", "var", "void", "with", "while" };
public JavaScanner() {
initialize();
initializeETLFunctions();
}
/**
* Returns the ending location of the current token in the document.
*/
public final int getLength() {
return fPos - fStartToken;
}
/**
* Initialize the lookup table.
*/
void initialize() {
fgKeys = new Hashtable<String, Integer>();
Integer k = Integer.valueOf( KEY );
for ( int i = 0; i < fgKeywords.length; i++ ) {
fgKeys.put( fgKeywords[i], k );
}
}
public void setETLKeywords( String[] kfKeywords ) {
this.kfKeywords = kfKeywords;
}
void initializeETLFunctions() {
kfKeys = new Hashtable<String, Integer>();
Integer k = Integer.valueOf( FUNCTIONS );
for ( int i = 0; i < kfKeywords.length; i++ ) {
kfKeys.put( kfKeywords[i], k );
}
}
/**
* Returns the starting location of the current token in the document.
*/
public final int getStartOffset() {
return fStartToken;
}
/**
* Returns the next lexical token in the document.
*/
public int nextToken() {
int c;
fStartToken = fPos;
while ( true ) {
switch ( c = read() ) {
case EOF:
return EOF;
case '/': // comment
c = read();
if ( c == '/' ) {
while ( true ) {
c = read();
if ( ( c == EOF ) || ( c == EOL ) ) {
unread( c );
return COMMENT;
}
}
} else {
unread( c );
}
return OTHER;
case '\'': // char const
for ( ;; ) {
c = read();
switch ( c ) {
case '\'':
return STRING;
case EOF:
unread( c );
return STRING;
case '\\':
c = read();
break;
default:
break;
}
}
case '"': // string
for ( ;; ) {
c = read();
switch ( c ) {
case '"':
return STRING;
case EOF:
unread( c );
return STRING;
case '\\':
c = read();
break;
default:
break;
}
}
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
do {
c = read();
} while ( Character.isDigit( (char) c ) );
unread( c );
return NUMBER;
default:
if ( Character.isWhitespace( (char) c ) ) {
do {
c = read();
} while ( Character.isWhitespace( (char) c ) );
unread( c );
return WHITE;
}
if ( Character.isJavaIdentifierStart( (char) c ) ) {
fBuffer.setLength( 0 );
do {
fBuffer.append( (char) c );
c = read();
} while ( Character.isJavaIdentifierPart( (char) c ) );
unread( c );
Integer i = fgKeys.get( fBuffer.toString() );
if ( i != null ) {
return i.intValue();
}
i = kfKeys.get( fBuffer.toString() );
if ( i != null ) {
return i.intValue();
}
return WORD;
}
return OTHER;
}
}
}
/**
* Returns next character.
*/
protected int read() {
if ( fPos <= fEnd ) {
return fDoc.charAt( fPos++ );
}
return EOF;
}
public void setRange( String text ) {
fDoc = text;
fPos = 0;
fEnd = fDoc.length() - 1;
}
protected void unread( int c ) {
if ( c != EOF ) {
fPos--;
}
}
}
}