public static ParseResult Parse(string[] args)
{
var errors = new List <string>();
var warnings = new List <string>();
var model = new CommandLineModel();
(string path, string value) split(string value, string splitter = "=")
{
if (value == null || !value.Contains(splitter))
{
errors.Add($"Switch value '{value}' must be formatted like PATH{splitter}VALUE.");
return(value, null);
}
var parts = value.Split(new string[] { splitter }, StringSplitOptions.None);
return(parts[0].Trim(), string.Join("", parts.Skip(1)).Trim());
}
void processGetter(string value)
{
if (string.IsNullOrWhiteSpace(value))
{
warnings.Add($"Cannot get an empty path. Ignoring this switch.");
return;
}
model.Query.Getters.Add(EpubPath.Parse(value));
}
void processFilter(string all)
{
var(path, value) = split(all);
if (string.IsNullOrWhiteSpace(path))
{
warnings.Add($"Cannot filter by an empty path. Ignoring this switch.");
return;
}
model.Query.Filters.Add((EpubPath.Parse(path), value));
}
void processSetter(string all)
{
var(path, value) = split(all);
if (string.IsNullOrWhiteSpace(path))
{
warnings.Add($"Cannot set an empty path. Ignoring this switch.");
return;
}
model.Query.Setters.Add((EpubPath.Parse(path), value));
}
void processVerb(string all)
{
var(path, verb) = split(all, "::");
if (string.IsNullOrWhiteSpace(verb))
{
warnings.Add($"Cannot run an empty verb {verb}. Ignoring this switch.");
return;
}
model.Query.Verbs.Add((EpubPath.Parse(path), verb));
}
void valueNotSpecified(string key)
{
errors.Add($"Value not specified for switch {key}");
}
IEnumerable <(string, string)> transformKeys()
{
string currentKey = null;
foreach (var currentItem in args)
{
if (currentItem.StartsWith("-"))
{
if (currentKey == null)
{
currentKey = currentItem;
continue;
}
else
{
valueNotSpecified(currentKey);
currentKey = currentItem;
continue;
}
}
yield return(currentKey, currentItem);
currentKey = null;
}
if (currentKey != null)
{
valueNotSpecified(currentKey);
}
}
var pairs = transformKeys();
foreach (var(key, value) in pairs)
{
switch (key?.ToLower())
{
case null: // this is a globbing request
model.FileRequests.Add(value?.Replace("\\", "/"));
break;
case "-d":
case "-dir":
case "--directory":
if (model.DefaultDirectory != null)
{
warnings.Add($"Default directory specified multiple times: {model.DefaultDirectory}, {value}.");
}
model.DefaultDirectory = value;
break;
case "-g":
case "--get":
processGetter(value);
break;
case "-w":
case "--where":
processFilter(value);
break;
case "-s":
case "--set":
processSetter(value);
break;
case "-v":
case "--verb":
processVerb(value);
break;
default:
warnings.Add($"Unknown switch {key}.");
break;
}
}
return(new ParseResult(model, errors, warnings));
}
public ParseResult(CommandLineModel commandLine, IEnumerable <string> errors, IEnumerable <string> warnings)
{
CommandLine = commandLine;
Errors = errors;
Warnings = warnings;
}
