private boolean executedNestedContentForCollOrSeqListing()

in freemarker-core/src/main/java/freemarker/core/IteratorBlock.java [275:362]
83 lines of code
19 McCabe index (conditional complexity)

        private boolean executedNestedContentForCollOrSeqListing(Environment env, TemplateElement[] childBuffer)
                throws IOException, TemplateException {
            final boolean listNotEmpty;
            if (listedValue instanceof TemplateCollectionModel) {
                final TemplateCollectionModel collModel = (TemplateCollectionModel) listedValue;
                final TemplateModelIterator iterModel
                        = openedIterator == null ? collModel.iterator()
                                : ((TemplateModelIterator) openedIterator);
                listNotEmpty = iterModel.hasNext();
                if (listNotEmpty) {
                    if (loopVar1Name != null) {
                        listLoop: do {
                            loopVar1Value = iterModel.next();
                            hasNext = iterModel.hasNext();
                            try {
                                visibleLoopVar1Name = loopVar1Name; // Makes all loop variables visible in FTL
                                env.visit(childBuffer);
                            } catch (BreakOrContinueException br) {
                                if (br == BreakOrContinueException.BREAK_INSTANCE) {
                                    break listLoop;
                                }
                            } finally {
                                visibleLoopVar1Name = null; // Hides all loop variables in FTL
                            }
                            index++;
                        } while (hasNext);
                        openedIterator = null;
                    } else {
                        // We must reuse this later, because TemplateCollectionModel-s that wrap an Iterator only
                        // allow one iterator() call. (Also those returned by ?filter, etc. with lazy result generation.)
                        openedIterator = iterModel;
                        // Note: Loop variables will only become visible inside #items
                        env.visit(childBuffer);
                    }
                }
            } else if (listedValue instanceof TemplateSequenceModel) {
                final TemplateSequenceModel seqModel = (TemplateSequenceModel) listedValue;
                final int size = seqModel.size();
                listNotEmpty = size != 0;
                if (listNotEmpty) {
                    if (loopVar1Name != null) {
                            listLoop: for (index = 0; index < size; index++) {
                                loopVar1Value = seqModel.get(index);
                                hasNext = (size > index + 1);
                                try {
                                    visibleLoopVar1Name = loopVar1Name; // Makes all loop variables visible in FTL
                                    env.visit(childBuffer);
                                } catch (BreakOrContinueException br) {
                                    if (br == BreakOrContinueException.BREAK_INSTANCE) {
                                        break listLoop;
                                    }
                                } finally {
                                    visibleLoopVar1Name = null; // Hides all loop variables in FTL
                                }
                            }
                    } else {
                        // Note: Loop variables will only become visible inside #items
                        env.visit(childBuffer);
                    }
                }
            } else if (env.isClassicCompatible()) {
                listNotEmpty = true;
                if (loopVar1Name != null) {
                    loopVar1Value = listedValue;
                    hasNext = false;
                }
                try {
                    visibleLoopVar1Name = loopVar1Name; // Makes all loop variables visible in FTL
                    env.visit(childBuffer);
                } catch (BreakOrContinueException br) {
                    // Silently exit "loop"
                } finally {
                    visibleLoopVar1Name = null; // Hides all loop variables in FTL
                }
            } else if (listedValue instanceof TemplateHashModelEx
                    && !NonSequenceOrCollectionException.isWrappedIterable(listedValue)) {
                throw new NonSequenceOrCollectionException(env,
                        new _ErrorDescriptionBuilder("The value you try to list is ",
                                new _DelayedAOrAn(new _DelayedFTLTypeDescription(listedValue)),
                                ", thus you must specify two loop variables after the \"as\"; one for the key, and "
                                + "another for the value, like ", "<#... as k, v>", ")."
                                ));
            } else {
                throw new NonSequenceOrCollectionException(
                        listedExp, listedValue, env);
            }
            return listNotEmpty;
        }