protected InlineOperation handle(Repeat oldRepeat) {
// initialize variables for this method
KnittingEngine engine = renderingContext.getEngine();
Until until = oldRepeat.getUntil();
Integer value = oldRepeat.getValue();
// ensure that we can continue to analyze this instruction for charting
if (dynamicFirstRowCastOn && until != Until.TIMES) {
log.info(
"Cannot chart this instruction because it is both defined in the header (i.e. without a knitting context) "
+ "and the first row has a repeat section that requires a knitting context."
+ "This can be fixed either by declaring the 'until' attribute of the repeat in the first row to be of type 'times', "
+ "or by including the repeats in the directions "
+ "section of the pattern instead of in the header.");
return null;
}
if (currentlyRepeating) {
log.info("Cannot currently chart nested repeats. This feature may be expanded in the future");
return null;
}
// see if we need to repeat at all. If not, just return "0 repeats"
if (!isRepeatNecessary(oldRepeat, engine)) {
return new Repeat(Until.TIMES, 0);
}
// at this point, we have to do the repeat (1 or more times)
currentlyRepeating = true;
// start gathering up information for the new repeat. Our goal is to
// convert all repeats
// into an until value that represents TIMES. This is so we won't need
// the engine to chart.
List<DiscreteInlineOperation> newOperations = new ArrayList<DiscreteInlineOperation>();
// gather current (pre-repeat) state
Object engineState = engine.save();
int originalChartWidth = this.currentRowInfo.getRowWidth();
// walk through all the instructions of this repeat ONCE to calculate
// the advance and increase count. If we find a work-even, remove
// the repeat all together and completely expand the row
boolean contextualOperationFound = false;
for (InlineOperation operation : oldRepeat.getOperations()) {
if (!contextualOperationFound && operation instanceof WorkEven) {
contextualOperationFound = true;
// if we find out there are contextual operations, clear out
// newOperations
// and wait for the actual repeat. We'll gather that info then.
newOperations.clear();
break;
}
InlineOperation newOperation = handle(operation);
// if a non-discrete inline operation or null is returned, we cannot
// chart, so return null up the chain
if (!(newOperation instanceof DiscreteInlineOperation)) {
return null;
}
newOperations.add((DiscreteInlineOperation) newOperation);
}
// reset the engine to the state before we repeated once
engine.restore(engineState);
this.currentRowInfo.setRowWidth(originalChartWidth);
int counter = 0;
switch (until) {
case TIMES:
for (int i = 0; i < value; i++) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
}
counter = value;
break;
case BEFORE_END:
while (engine.getStitchesRemainingInRow() > value) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
counter++;
}
break;
case END:
while (engine.getStitchesRemainingInRow() > 0) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
counter++;
}
break;
case BEFORE_GAP:
while (engine.getStitchesToGap() > value) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
counter++;
}
break;
case BEFORE_MARKER:
while (engine.getStitchesToNextMarker() > value) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
counter++;
}
break;
case MARKER:
while (engine.getStitchesToNextMarker() > 0) {
// advanceAndIncrease(advanceCount, increaseCount);
for (InlineOperation operation : oldRepeat.getOperations()) {
DiscreteInlineOperation newOperation = (DiscreteInlineOperation) handle(operation);
if (contextualOperationFound) {
newOperations.add(newOperation);
}
}
counter++;
}
break;
default:
throw new RuntimeException("The until value [" + until + "] has not been properly coded");
}
currentlyRepeating = false;
if (contextualOperationFound) {
// make a stitch group out of all of the gathered operations if
// we are dealing with work even operations
return new OperationGroup(newOperations);
} else {
Repeat newRepeat = new Repeat();
newRepeat.setOperations(newOperations);
newRepeat.setUntil(Until.TIMES);
newRepeat.setValue(counter);
return newRepeat;
}
}
private void save() throws Exception {
memento = engine.save();
}