private const string _formatItemsRegex = @"({+)[a-zA-Z_]+(?:(?:\.[a-zA-Z_])?[a-zA-Z0-9_]*)*(?::(?:n|N))?(}+)"; // {fieldPath[:indicator]}, e.g. {field}, {field.field:n}
public static string FormatString(string input, out IList<FormatItem> items)
{
Debug.Assert(input != null);
items = new List<FormatItem>();
var matches = Regex.Matches(input, _formatItemsRegex);
var message = new StringBuilder();
Match prev = null;
for (var i = 0; i < matches.Count; i++)
{
var match = matches[i];
var item = match.Value;
var leftBraces = match.Groups[1];
var rightBraces = match.Groups[2];
if (leftBraces.Length != rightBraces.Length)
throw new FormatException("Input string was not in a correct format.");
var start = prev != null ? prev.Index + prev.Length : 0;
var chars = match.Index - start;
message.Append(input.Substring(start, chars));
prev = match;
var added = items.SingleOrDefault(x => x.Body == item);
if (added != null)
{
message.Append(added.Uuid);
continue;
}
var length = leftBraces.Length;
// flatten each pair of braces into single brace in order to escape them (just like string.Format() does)
var leftBracesFlattened = new string('{', length / 2);
var rightBracesFlattened = new string('}', length / 2);
var uuid = Guid.NewGuid();
var param = item.Substring(length, item.Length - 2 * length);
var current = new FormatItem
{
Uuid = uuid,
Body = item,
Constant = length % 2 == 0,
FieldPath = param.Contains(":") ? param.Substring(0, param.IndexOf(":", StringComparison.Ordinal)) : param,
Indicator = param.Contains(":") ? param.Substring(param.IndexOf(":", StringComparison.Ordinal) + 1) : null,
Substitute = $"{leftBracesFlattened}{(length%2 != 0 ? uuid.ToString() : param)}{rightBracesFlattened}" // for odd number of braces, substitute param with respective value (just like string.Format() does)
};
items.Add(current);
message.Append(current.Uuid);
}
if(prev != null)
message.Append(input.Substring(prev.Index + prev.Length));
return message.Length > 0 ? message.ToString() : input;
}
private const string _formatItemsRegex = @"({+)[a-zA-Z_]+(?:(?:\.[a-zA-Z_])?[a-zA-Z0-9_]*)*(?::(?:n|N))?(}+)"; // {fieldPath[:indicator]}, e.g. {field}, {field.field:n}
public static string FormatString(string input, out IList <FormatItem> items)
{
Debug.Assert(input != null);
items = new List <FormatItem>();
var matches = Regex.Matches(input, _formatItemsRegex);
var message = new StringBuilder();
Match prev = null;
for (var i = 0; i < matches.Count; i++)
{
var match = matches[i];
var item = match.Value;
var leftBraces = match.Groups[1];
var rightBraces = match.Groups[2];
if (leftBraces.Length != rightBraces.Length)
{
throw new FormatException("Input string was not in a correct format.");
}
var start = prev != null ? prev.Index + prev.Length : 0;
var chars = match.Index - start;
message.Append(input.Substring(start, chars));
prev = match;
var added = items.SingleOrDefault(x => x.Body == item);
if (added != null)
{
message.Append(added.Uuid);
continue;
}
var length = leftBraces.Length;
// flatten each pair of braces into single brace in order to escape them (just like string.Format() does)
var leftBracesFlattened = new string('{', length / 2);
var rightBracesFlattened = new string('}', length / 2);
var uuid = Guid.NewGuid();
var param = item.Substring(length, item.Length - 2 * length);
var current = new FormatItem
{
Uuid = uuid,
Body = item,
Constant = length % 2 == 0,
FieldPath = param.Contains(":") ? param.Substring(0, param.IndexOf(":", StringComparison.Ordinal)) : param,
Indicator = param.Contains(":") ? param.Substring(param.IndexOf(":", StringComparison.Ordinal) + 1) : null,
Substitute = $"{leftBracesFlattened}{(length%2 != 0 ? uuid.ToString() : param)}{rightBracesFlattened}" // for odd number of braces, substitute param with respective value (just like string.Format() does)
};
items.Add(current);
message.Append(current.Uuid);
}
if (prev != null)
{
message.Append(input.Substring(prev.Index + prev.Length));
}
return(message.Length > 0 ? message.ToString() : input);
}
