private ConfigMap load()

in juneau-core/juneau-config/src/main/java/org/apache/juneau/config/internal/ConfigMap.java [76:200]
110 lines of code
32 McCabe index (conditional complexity)

	private ConfigMap load(String contents) throws IOException {
		if (contents == null)
			contents = "";
		this.contents = contents;

		entries.clear();
		oentries.clear();
		imports.forEach(Import::unregisterAll);
		imports.clear();

		Map<String,ConfigMap> imports = map();

		List<String> lines = linkedList();
		try (Scanner scanner = new Scanner(contents)) {
			while (scanner.hasNextLine()) {
				String line = scanner.nextLine();
				char c = firstChar(line);
				int c2 = StringUtils.lastNonWhitespaceChar(line);
				if (c == '[') {
					String l = line.trim();
					if (c2 != ']' || ! isValidNewSectionName(l.substring(1, l.length()-1)))
						throw new ConfigException("Invalid section name found in configuration:  {0}", line);
				} else if (c == '<') {
					String l = line.trim();
					int i = l.indexOf('>');
					if (i != -1) {
						String l2 = l.substring(1, i);
						if (! isValidConfigName(l2))
							throw new ConfigException("Invalid import config name found in configuration:  {0}", line);
						String l3 = l.substring(i+1);
						if (! (isEmpty(l3) || firstChar(l3) == '#'))
							throw new ConfigException("Invalid import config name found in configuration:  {0}", line);
						String importName = l2.trim();
						try {
							if (! imports.containsKey(importName))
								imports.put(importName, store.getMap(importName));
						} catch (StackOverflowError e) {
							throw new IOException("Import loop detected in configuration '"+name+"'->'"+importName+"'");
						}
					}
				}
				lines.add(line);
			}
		}

		List<Import> irl = list(imports.size());
		forEachReverse(listFrom(imports.values()), x -> irl.add(new Import(x).register(listeners)));
		this.imports.addAll(irl);

		// Add [blank] section.
		boolean inserted = false;
		boolean foundComment = false;
		for (ListIterator<String> li = lines.listIterator(); li.hasNext();) {
			String l = li.next();
			char c = firstNonWhitespaceChar(l);
			if (c != '#') {
				if (c == 0 && foundComment) {
					li.set("[]");
					inserted = true;
				}
				break;
			}
			foundComment = true;
		}
		if (! inserted)
			lines.add(0, "[]");

		// Collapse any multi-lines.
		ListIterator<String> li = lines.listIterator(lines.size());
		String accumulator = null;
		while (li.hasPrevious()) {
			String l = li.previous();
			char c = firstChar(l);
			if (c == '\t') {
				c = firstNonWhitespaceChar(l);
				if (c != '#') {
					if (accumulator == null)
						accumulator = l.substring(1);
					else
						accumulator = l.substring(1) + "\n" + accumulator;
					li.remove();
				}
			} else if (accumulator != null) {
				li.set(l + "\n" + accumulator);
				accumulator = null;
			}
		}

		lines = copyOf(lines);
		int last = lines.size()-1;
		int S1 = 1; // Looking for section.
		int S2 = 2; // Found section, looking for start.
		int state = S1;

		List<ConfigSection> sections = list();

		for (int i = last; i >= 0; i--) {
			String l = lines.get(i);
			char c = firstChar(l);

			if (state == S1) {
				if (c == '[') {
					state = S2;
				}
			} else {
				if (c != '#' && (c == '[' || l.indexOf('=') != -1)) {
					sections.add(new ConfigSection(lines.subList(i+1, last+1)));
					last = i + 1;// (c == '[' ? i+1 : i);
					state = (c == '[' ? S2 : S1);
				}
			}
		}

		sections.add(new ConfigSection(lines.subList(0, last+1)));

		for (int i = sections.size() - 1; i >= 0; i--) {
			ConfigSection cs = sections.get(i);
			if (entries.containsKey(cs.name))
				throw new ConfigException("Duplicate section found in configuration:  [{0}]", cs.name);
			entries.put(cs.name, cs);
		 }

		oentries.putAll(entries);
		return this;
	}