/**
* Formats a list of edits in unified diff format
*
* @param edits some differences which have been calculated between A and B
* @param a the text A which was compared
* @param b the text B which was compared
* @throws IOException
*/
public void format(final EditList edits, final RawText a, final RawText b) throws IOException {
for (int curIdx = 0; curIdx < edits.size(); ) {
Edit curEdit = edits.get(curIdx);
final int endIdx = findCombinedEnd(edits, curIdx);
final Edit endEdit = edits.get(endIdx);
int aCur = Math.max(0, curEdit.getBeginA() - context);
int bCur = Math.max(0, curEdit.getBeginB() - context);
final int aEnd = Math.min(a.size(), endEdit.getEndA() + context);
final int bEnd = Math.min(b.size(), endEdit.getEndB() + context);
writeHunkHeader(aCur, aEnd, bCur, bEnd);
while (aCur < aEnd || bCur < bEnd) {
if (aCur < curEdit.getBeginA() || endIdx + 1 < curIdx) {
writeContextLine(a, aCur);
if (isEndOfLineMissing(a, aCur)) out.write(noNewLine);
aCur++;
bCur++;
} else if (aCur < curEdit.getEndA()) {
writeRemovedLine(a, aCur);
if (isEndOfLineMissing(a, aCur)) out.write(noNewLine);
aCur++;
} else if (bCur < curEdit.getEndB()) {
writeAddedLine(b, bCur);
if (isEndOfLineMissing(b, bCur)) out.write(noNewLine);
bCur++;
}
if (end(curEdit, aCur, bCur) && ++curIdx < edits.size()) curEdit = edits.get(curIdx);
}
}
}
@Test
public void testCreate() {
final Edit e = new Edit(1, 2, 3, 4);
assertEquals(1, e.getBeginA());
assertEquals(2, e.getEndA());
assertEquals(3, e.getBeginB());
assertEquals(4, e.getEndB());
}
@Test
public void testCreateEmpty() {
final Edit e = new Edit(1, 3);
assertEquals(1, e.getBeginA());
assertEquals(1, e.getEndA());
assertEquals(3, e.getBeginB());
assertEquals(3, e.getEndB());
assertTrue("is empty", e.isEmpty());
assertSame(Edit.Type.EMPTY, e.getType());
}
private static boolean end(final Edit edit, final int a, final int b) {
return edit.getEndA() <= a && edit.getEndB() <= b;
}
