/// <summary>
/// Parse the specified format string.
/// </summary>
/// <param name='format'>
/// The format string.
/// </param>
public FormatStringParseResult Parse (string format)
{
if (format == null)
throw new ArgumentNullException ("format");
var result = new FormatStringParseResult();
// Format string syntax: http://msdn.microsoft.com/en-us/library/txafckwd.aspx
int textStart = 0;
var length = format.Length;
for (int i = 0; i < length; i++) {
// Get fixed text
GetText (format, ref i);
if (i < format.Length && format [i] == '{') {
int formatItemStart = i;
int index;
int? alignment = null;
string argumentFormat = null;
var textSegmentErrors = new List<IFormatStringError>(GetErrors());
// Try to parse the parts of the format item
++i;
index = ParseIndex (format, ref i);
CheckForMissingEndBrace (format, i, length);
alignment = ParseAlignment (format, ref i, length);
CheckForMissingEndBrace (format, i, length);
argumentFormat = ParseSubFormatString (format, ref i, length);
CheckForMissingEndBrace (format, i, length);
// Check what we parsed
if (i == formatItemStart + 1 && (i == length || (i < length && format [i] != '}'))) {
// There were no format item after all, this was just an
// unescaped left brace
SetErrors(textSegmentErrors);
AddError (new DefaultFormatStringError {
Message = "Unescaped '{'",
StartLocation = formatItemStart,
EndLocation = formatItemStart + 1,
OriginalText = "{",
SuggestedReplacementText = "{{"
});
continue;
} else if (formatItemStart - textStart > 0) {
// We have parsed a format item, end the text segment
var textSegment = new TextSegment (UnEscape (format.Substring (textStart, formatItemStart - textStart)));
textSegment.Errors = textSegmentErrors;
result.Segments.Add (textSegment);
}
// Unclosed format items in fixed text gets advances i one step too far
if (i < length && format [i] != '}')
--i;
// i may actually point outside of format if there is a syntactical error
// if that happens, we want the last position
var endLocation = Math.Min (length, i + 1);
result.Segments.Add (new FormatItem (index, alignment, argumentFormat) {
StartLocation = formatItemStart,
EndLocation = endLocation,
Errors = GetErrors ()
});
ClearErrors ();
// The next potential text segment starts after this format item
textStart = i + 1;
}
}
// Handle remaining text
if (textStart < length) {
var textSegment = new TextSegment (UnEscape (format.Substring (textStart)), textStart);
textSegment.Errors = GetErrors();
result.Segments.Add (textSegment);
}
return result;
}
/// <summary>
/// Parse the specified format string.
/// </summary>
/// <param name='format'>
/// The format string.
/// </param>
public FormatStringParseResult Parse(string format)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
var result = new FormatStringParseResult();
// Format string syntax: http://msdn.microsoft.com/en-us/library/txafckwd.aspx
int textStart = 0;
var length = format.Length;
for (int i = 0; i < length; i++)
{
// Get fixed text
GetText(format, ref i);
if (i < format.Length && format [i] == '{')
{
int formatItemStart = i;
int index;
int? alignment = null;
string argumentFormat = null;
var textSegmentErrors = new List <IFormatStringError>(GetErrors());
// Try to parse the parts of the format item
++i;
index = ParseIndex(format, ref i);
CheckForMissingEndBrace(format, i, length);
alignment = ParseAlignment(format, ref i, length);
CheckForMissingEndBrace(format, i, length);
argumentFormat = ParseSubFormatString(format, ref i, length);
CheckForMissingEndBrace(format, i, length);
// Check what we parsed
if (i == formatItemStart + 1 && (i == length || (i < length && format [i] != '}')))
{
// There were no format item after all, this was just an
// unescaped left brace
SetErrors(textSegmentErrors);
AddError(new DefaultFormatStringError {
Message = "Unescaped '{'",
StartLocation = formatItemStart,
EndLocation = formatItemStart + 1,
OriginalText = "{",
SuggestedReplacementText = "{{"
});
continue;
}
else if (formatItemStart - textStart > 0)
{
// We have parsed a format item, end the text segment
var textSegment = new TextSegment(UnEscape(format.Substring(textStart, formatItemStart - textStart)));
textSegment.Errors = textSegmentErrors;
result.Segments.Add(textSegment);
}
// Unclosed format items in fixed text gets advances i one step too far
if (i < length && format [i] != '}')
{
--i;
}
// i may actually point outside of format if there is a syntactical error
// if that happens, we want the last position
var endLocation = Math.Min(length, i + 1);
result.Segments.Add(new FormatItem(index, alignment, argumentFormat)
{
StartLocation = formatItemStart,
EndLocation = endLocation,
Errors = GetErrors()
});
ClearErrors();
// The next potential text segment starts after this format item
textStart = i + 1;
}
}
// Handle remaining text
if (textStart < length)
{
var textSegment = new TextSegment(UnEscape(format.Substring(textStart)), textStart);
textSegment.Errors = GetErrors();
result.Segments.Add(textSegment);
}
return(result);
}
