private void WriteMismatchedPlatformPackageVersionMessageIfNecessary()

in src/Tasks/Microsoft.NET.Build.Tasks/ResolvePackageAssets.cs [881:933]
45 lines of code
11 McCabe index (conditional complexity)

            private void WriteMismatchedPlatformPackageVersionMessageIfNecessary()
            {
                bool hasTwoPeriods(string s)
                {
                    int firstPeriodIndex = s.IndexOf('.');
                    if (firstPeriodIndex < 0)
                    {
                        return false;
                    }
                    int secondPeriodIndex = s.IndexOf('.', firstPeriodIndex + 1);
                    return secondPeriodIndex >= 0;
                }

                if (_task.VerifyMatchingImplicitPackageVersion &&
                    _task.ExpectedPlatformPackages != null)
                {
                    foreach (var implicitPackage in _task.ExpectedPlatformPackages)
                    {
                        var packageName = implicitPackage.ItemSpec;
                        var expectedVersion = implicitPackage.GetMetadata(MetadataKeys.Version);

                        if (string.IsNullOrEmpty(packageName) ||
                            string.IsNullOrEmpty(expectedVersion) ||
                            //  If RuntimeFrameworkVersion was specified as a version range or a floating version,
                            //  then we can't compare the versions directly, so just skip the check
                            expectedVersion.IndexOfAny(_specialNuGetVersionChars) >= 0)
                        {
                            continue;
                        }

                        var restoredPackage = _runtimeTarget.GetLibrary(packageName);
                        if (restoredPackage != null)
                        {
                            var restoredVersion = restoredPackage.Version.ToNormalizedString();

                            //  Normalize expected version.  For example, converts "2.0" to "2.0.0"
                            if (!hasTwoPeriods(expectedVersion))
                            {
                                expectedVersion += ".0";
                            }

                            if (restoredVersion != expectedVersion)
                            {
                                WriteItem(string.Format(Strings.MismatchedPlatformPackageVersion,
                                                        packageName,
                                                        restoredVersion,
                                                        expectedVersion));
                                WriteMetadata(MetadataKeys.Severity, nameof(LogLevel.Error));
                            }
                        }
                    }
                }
            }