@Test
public void headtail() {
Range<Integer> range = new IntRange(0, 5).incrementBy(2);
assertThat(range.isEmpty(), is(false));
assertThat(range.head(), is(0));
assertThat(range.tail().head(), is(2));
assertThat(range.tail().tail().head(), is(4));
assertThat(range.tail().tail().tail().isEmpty(), is(true));
}
@Test
public void empty() {
List<IntRange> ranges = asList(new IntRange(0, 0), new IntRange(5, 4));
for (Range<Integer> range : ranges) {
assertThat(range.iterator().hasNext(), is(false));
assertThat(range.isEmpty(), is(true));
assertThat(range.size(), is(0));
assertThat((Object) range.head(), is(nullValue()));
assertThat(range.tail().isEmpty(), is(true));
}
}
void addRange(Range range, TextSectionMapping mapTable, VmResourceId destinationResource) {
RangeGroup structure = getSafe(rangeMap, range.start);
if (structure == null) {
structure = new RangeGroup();
this.rangeMap.put(range.start, structure);
}
if (range.isEmpty()) {
structure.emptyRangesAtStart++;
} else {
if (structure.nonEmptyRangeMapping != null) {
throw new RuntimeException();
}
structure.nonEmptyRangeMapping = new RangeMapping(range, destinationResource, mapTable);
}
}
public boolean shouldComplete(NativeEvent event) {
// Never complete if there's an active selection
Range range = getSession().getSelection().getRange();
if (!range.isEmpty()) return false;
// Don't consider Tab to be a completion if we're at the start of a
// line (e.g. only zero or more whitespace characters between the
// beginning of the line and the cursor)
if (event != null && event.getKeyCode() != KeyCodes.KEY_TAB) return true;
int col = range.getStart().getColumn();
if (col == 0) return false;
String row = getSession().getLine(range.getStart().getRow());
return row.substring(0, col).trim().length() != 0;
}
public void removeRange(Range range) {
RangeGroup rangeGroup = rangeMap.get(range.start);
if (range.isEmpty()) {
if (rangeGroup.emptyRangesAtStart <= 0) {
throw new IllegalStateException();
}
rangeGroup.emptyRangesAtStart--;
} else {
if (rangeGroup.nonEmptyRangeMapping == null
|| !range.equals(rangeGroup.nonEmptyRangeMapping.sourceRange)) {
throw new IllegalStateException();
}
rangeGroup.nonEmptyRangeMapping = null;
}
if (rangeGroup.nonEmptyRangeMapping == null && rangeGroup.emptyRangesAtStart == 0) {
rangeMap.remove(range.start);
}
}