/** deletes the selected text */
public void delete(final TextSelection selection) {
final CursorPosition from = selection.from();
final CursorPosition to = selection.to();
final BlockToLineMapping fromMapping = findBlockFor(from.getLine());
final int fromBlock = fromMapping.index;
final int fromLine = fromMapping.line;
final int fromCharacter = from.getCharacter();
final BlockToLineMapping toMapping = findBlockFor(to.getLine());
final int toBlock = toMapping.index;
final int toLine = toMapping.line;
final int toCharacter = to.getCharacter();
if (fromBlock == toBlock) {
final TextBlock block = (TextBlock) blocks.elementAt(fromBlock);
block.delete(fromLine, fromCharacter, toLine, toCharacter);
} else {
TextBlock block = (TextBlock) blocks.elementAt(toBlock);
block.deleteTo(toLine, toCharacter);
block = (TextBlock) blocks.elementAt(fromBlock);
block.deleteFrom(fromLine, fromCharacter);
fromMapping.textBlock.join(toMapping.textBlock);
blocks.removeElementAt(toMapping.index);
for (int i = fromBlock + 1; i < toBlock; i++) {
blocks.removeElementAt(i);
}
}
}
public void deleteLeft(final CursorPosition cursorAt) {
final BlockToLineMapping mapping = findBlockFor(cursorAt.getLine());
if (mapping == null || mapping.textBlock == null) {
throw new IsisException("invalid block " + mapping + " for line " + cursorAt.getLine());
}
mapping.textBlock.deleteLeft(mapping.line, cursorAt.getCharacter());
}
public void insert(final CursorPosition cursorAt, final String characters) {
Assert.assertNotNull(cursorAt);
final BlockToLineMapping block = findBlockFor(cursorAt.getLine());
Assert.assertNotNull("failed to get block for line " + cursorAt.getLine(), block);
block.textBlock.insert(block.line, cursorAt.getCharacter(), characters);
}
/** returns only the text that is selected */
public String getText(final TextSelection selection) {
final CursorPosition from = selection.from();
final CursorPosition to = selection.to();
final int line = from.getLine();
String text = getText(line);
if (from.getLine() == to.getLine()) {
return text.substring(from.getCharacter(), to.getCharacter());
} else {
final StringBuffer str = new StringBuffer();
str.append(text.substring(from.getCharacter()));
for (int i = line + 1; i < line + (to.getLine() - from.getLine()); i++) {
text = getText(i);
str.append(text);
}
text = getText(line + (to.getLine() - from.getLine()));
str.append(text.substring(0, to.getCharacter()));
return str.toString();
}
}
public void deleteRight(final CursorPosition cursorAt) {
final BlockToLineMapping mapping = findBlockFor(cursorAt.getLine());
mapping.textBlock.deleteRight(mapping.line, cursorAt.getCharacter());
}
public void breakBlock(final CursorPosition cursorAt) {
final BlockToLineMapping mapping = findBlockFor(cursorAt.getLine());
final TextBlock newBlock = mapping.textBlock.splitAt(mapping.line, cursorAt.getCharacter());
blocks.insertElementAt(newBlock, mapping.index + 1);
}