public void ModifyFile(string filePath, IVariables variables)
{
try
{
void LogReplacement(string key)
=> log.Verbose(StructuredConfigMessages.StructureFound(key));
var replaced = 0;
var variablesByKey = variables
.Where(v => !OctopusReservedVariablePattern.IsMatch(v.Key))
.DistinctBy(v => v.Key)
.ToDictionary <KeyValuePair <string, string>, string, Func <string?> >(v => v.Key,
v => () =>
{
LogReplacement(v.Key);
replaced++;
return(variables.Get(v.Key));
},
StringComparer.OrdinalIgnoreCase);
// Read and transform the input file
var fileText = fileSystem.ReadFile(filePath, out var encoding);
var lineEnding = fileText.GetMostCommonLineEnding();
var outputEvents = new List <ParsingEvent>();
var indentDetector = new YamlIndentDetector();
using (var reader = new StringReader(fileText))
{
var scanner = new Scanner(reader, false);
var parser = new Parser(scanner);
var classifier = new YamlEventStreamClassifier();
(IYamlNode startEvent, string?replacementValue)? structureWeAreReplacing = null;
while (parser.MoveNext())
{
var ev = parser.Current;
if (ev == null)
{
continue;
}
indentDetector.Process(ev);
if (ev is Comment c)
{
ev = c.RestoreLeadingSpaces();
}
var node = classifier.Process(ev);
if (structureWeAreReplacing == null)
{
// Not replacing: searching for things to replace, copying events to output.
if (node is YamlNode <Scalar> scalar &&
variablesByKey.TryGetValue(scalar.Path, out var newValue))
{
outputEvents.Add(scalar.Event.ReplaceValue(newValue()));
}
else if (node is YamlNode <MappingStart> mappingStart &&
variablesByKey.TryGetValue(mappingStart.Path, out var mappingReplacement))
{
structureWeAreReplacing = (mappingStart, mappingReplacement());
}
else if (node is YamlNode <SequenceStart> sequenceStart &&
variablesByKey.TryGetValue(sequenceStart.Path, out var sequenceReplacement))
{
structureWeAreReplacing = (sequenceStart, sequenceReplacement());
}