private static String readValue()

in org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java [1410:1505]
90 lines of code
27 McCabe index (conditional complexity)

	private static String readValue(StringReader in)
			throws ConfigInvalidException {
		StringBuilder value = new StringBuilder();
		StringBuilder trailingSpaces = null;
		boolean quote = false;
		boolean inLeadingSpace = true;

		for (;;) {
			int c = in.read();
			if (c < 0) {
				break;
			}
			if ('\n' == c) {
				if (quote) {
					throw new ConfigInvalidException(
							JGitText.get().newlineInQuotesNotAllowed);
				}
				in.reset();
				break;
			}

			if (!quote && (';' == c || '#' == c)) {
				if (trailingSpaces != null) {
					trailingSpaces.setLength(0);
				}
				in.reset();
				break;
			}

			char cc = (char) c;
			if (Character.isWhitespace(cc)) {
				if (inLeadingSpace) {
					continue;
				}
				if (trailingSpaces == null) {
					trailingSpaces = new StringBuilder();
				}
				trailingSpaces.append(cc);
				continue;
			}
			inLeadingSpace = false;
			if (trailingSpaces != null) {
				value.append(trailingSpaces);
				trailingSpaces.setLength(0);
			}

			if ('\\' == c) {
				c = in.read();
				switch (c) {
				case -1:
					throw new ConfigInvalidException(JGitText.get().endOfFileInEscape);
				case '\n':
					continue;
				case 't':
					value.append('\t');
					continue;
				case 'b':
					value.append('\b');
					continue;
				case 'n':
					value.append('\n');
					continue;
				case '\\':
					value.append('\\');
					continue;
				case '"':
					value.append('"');
					continue;
				case '\r': {
					int next = in.read();
					if (next == '\n') {
						continue; // CR-LF
					} else if (next >= 0) {
						in.reset();
					}
					break;
				}
				default:
					break;
				}
				throw new ConfigInvalidException(
						MessageFormat.format(JGitText.get().badEscape,
								Character.isAlphabetic(c)
										? Character.valueOf(((char) c))
										: toUnicodeLiteral(c)));
			}

			if ('"' == c) {
				quote = !quote;
				continue;
			}

			value.append(cc);
		}
		return value.length() > 0 ? value.toString() : null;
	}