| 1 | /** |
| 2 | * |
| 3 | */ |
| 4 | package de.uka.ipd.sdq.pcm.dialogs.stoex; |
| 5 | |
| 6 | import java.lang.reflect.InvocationTargetException; |
| 7 | |
| 8 | import org.antlr.runtime.ANTLRStringStream; |
| 9 | import org.antlr.runtime.BaseRecognizer; |
| 10 | import org.antlr.runtime.CharStream; |
| 11 | import org.antlr.runtime.Lexer; |
| 12 | import org.eclipse.jface.text.BadLocationException; |
| 13 | import org.eclipse.jface.text.IDocument; |
| 14 | import org.eclipse.jface.text.rules.IToken; |
| 15 | import org.eclipse.jface.text.rules.ITokenScanner; |
| 16 | |
| 17 | /** |
| 18 | * @author Steffen Becker |
| 19 | * |
| 20 | */ |
| 21 | public class ANTLRTokenScannerAdapter implements ITokenScanner { |
| 22 | |
| 23 | int lastTokenLength = 0; |
| 24 | |
| 25 | private int tokenOffset; |
| 26 | |
| 27 | private Class<?> scannerClass; |
| 28 | |
| 29 | private Lexer scanner; |
| 30 | |
| 31 | private String currentInput; |
| 32 | |
| 33 | private IDocument currentDocument; |
| 34 | |
| 35 | private int baseOffset; |
| 36 | |
| 37 | private ITokenMapper myMapper; |
| 38 | |
| 39 | private int lastTokenOffset; |
| 40 | |
| 41 | /** |
| 42 | * |
| 43 | */ |
| 44 | public ANTLRTokenScannerAdapter(Class<?> scannerClass, ITokenMapper mapper) { |
| 45 | this.scannerClass = scannerClass; |
| 46 | this.myMapper = mapper; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * (non-Javadoc) |
| 51 | * |
| 52 | * @see org.eclipse.jface.text.rules.ITokenScanner#getTokenLength() |
| 53 | */ |
| 54 | public int getTokenLength() { |
| 55 | return lastTokenLength; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * (non-Javadoc) |
| 60 | * |
| 61 | * @see org.eclipse.jface.text.rules.ITokenScanner#getTokenOffset() |
| 62 | */ |
| 63 | public int getTokenOffset() { |
| 64 | return tokenOffset; |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * (non-Javadoc) |
| 69 | * |
| 70 | * @see org.eclipse.jface.text.rules.ITokenScanner#nextToken() |
| 71 | */ |
| 72 | public IToken nextToken() { |
| 73 | tokenOffset = baseOffset + scanner.getCharIndex(); // Token starts at point where lexer is |
| 74 | ANTLRTokenWrapper wrapper = new ANTLRTokenWrapper(scanner.nextToken(), myMapper); |
| 75 | lastTokenLength = wrapper.getToken().getText() == null ? 0 : wrapper.getToken().getText().length(); |
| 76 | tokenOffset += (scanner.getCharIndex() + baseOffset) - tokenOffset - lastTokenLength; // Correct the position in case of recognition exceptions |
| 77 | |
| 78 | wrapper.setIsWhitespace(wrapper.getToken().getChannel() == BaseRecognizer.HIDDEN);// Token is a Whitespace |
| 79 | return wrapper; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * (non-Javadoc) |
| 84 | * |
| 85 | * @see org.eclipse.jface.text.rules.ITokenScanner#setRange(org.eclipse.jface.text.IDocument, |
| 86 | * int, int) |
| 87 | */ |
| 88 | public void setRange(IDocument document, int offset, int length) { |
| 89 | currentInput = ""; currentDocument = document; |
| 90 | try { |
| 91 | currentInput = document.get(offset, length); |
| 92 | lastTokenOffset = 0; |
| 93 | tokenOffset = offset; |
| 94 | baseOffset = offset; |
| 95 | } catch (BadLocationException e1) { |
| 96 | // TODO Auto-generated catch block |
| 97 | e1.printStackTrace(); |
| 98 | } |
| 99 | ANTLRStringStream reader = new ANTLRStringStream(currentInput); |
| 100 | try { |
| 101 | scanner = (Lexer) scannerClass.getConstructor(CharStream.class) |
| 102 | .newInstance(new Object[] { reader }); |
| 103 | } catch (IllegalArgumentException e) { |
| 104 | // TODO Auto-generated catch block |
| 105 | e.printStackTrace(); |
| 106 | } catch (SecurityException e) { |
| 107 | // TODO Auto-generated catch block |
| 108 | e.printStackTrace(); |
| 109 | } catch (InstantiationException e) { |
| 110 | // TODO Auto-generated catch block |
| 111 | e.printStackTrace(); |
| 112 | } catch (IllegalAccessException e) { |
| 113 | // TODO Auto-generated catch block |
| 114 | e.printStackTrace(); |
| 115 | } catch (InvocationTargetException e) { |
| 116 | // TODO Auto-generated catch block |
| 117 | e.printStackTrace(); |
| 118 | } catch (NoSuchMethodException e) { |
| 119 | // TODO Auto-generated catch block |
| 120 | e.printStackTrace(); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | } |