internal ParsingErrorEventArgs(ParsingErrors errors, bool throwsException)
{
Errors = errors;
ThrowsException = throwsException;
}
public Format ParseFormat(string format, string[] formatterExtensionNames)
{
var result = new Format(Settings, format);
var current = result;
Placeholder currentPlaceholder = null;
var namedFormatterStartIndex = -1;
var namedFormatterOptionsStartIndex = -1;
var namedFormatterOptionsEndIndex = -1;
// Store parsing errors until the end:
var parsingErrors = new ParsingErrors(result);
var parsingErrorText = new ParsingErrorText();
// Cache properties:
var openingBrace = _openingBrace;
var closingBrace = _closingBrace;
var nestedDepth = 0;
var lastI = 0;
var operatorIndex = 0;
var selectorIndex = 0;
for (int i = 0, length = format.Length; i < length; i++)
{
var c = format[i];
if (currentPlaceholder == null)
{
if (c == openingBrace)
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(Settings, current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
// See if this brace should be escaped:
if (!_alternativeEscaping)
{
var nextI = lastI;
if (nextI < length && format[nextI] == openingBrace)
{
i++;
continue;
}
}
// New placeholder:
nestedDepth++;
currentPlaceholder = new Placeholder(Settings, current, i, nestedDepth);
current.Items.Add(currentPlaceholder);
current.HasNested = true;
operatorIndex = i + 1;
selectorIndex = 0;
namedFormatterStartIndex = -1;
}
else if (c == closingBrace)
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(Settings, current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
// See if this brace should be escaped:
if (!_alternativeEscaping)
{
var nextI = lastI;
if (nextI < length && format[nextI] == closingBrace)
{
i++;
continue;
}
}
// Make sure that this is a nested placeholder before we un-nest it:
if (current.parent == null)
{
parsingErrors.AddIssue(current, parsingErrorText[ParsingError.TooManyClosingBraces], i, i + 1);
OnParsingFailure?.Invoke(this, new ParsingErrorEventArgs(current.RawText, i, i + 1, ParsingError.TooManyClosingBraces, Settings.ParseErrorAction != ErrorAction.ThrowError));
continue;
}
// End of the placeholder's Format:
nestedDepth--;
current.endIndex = i;
current.parent.endIndex = i + 1;
current = current.parent.parent;
namedFormatterStartIndex = -1;
}
else if ((c == CharLiteralEscapeChar && Settings.ConvertCharacterStringLiterals) || (_alternativeEscaping && c == _alternativeEscapeChar))
{
namedFormatterStartIndex = -1;
// See that is the next character
var nextI = i + 1;
// **** Alternative brace escaping with { or } following the escape character ****
if (nextI < length && (format[nextI] == openingBrace || format[nextI] == closingBrace))
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(Settings, current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
i++;
continue;
}
else
{
// **** Escaping of charater literals like \t, \n, \v etc. ****
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(Settings, current, lastI)
{
endIndex = i
});
}
lastI = i + 2;
if (lastI > length)
{
lastI = length;
}
// Next add the character literal INCLUDING the escape character, which LiteralText will expect
current.Items.Add(new LiteralText(Settings, current, i)
{
endIndex = lastI
});
i++;
continue;
}
}
else if (namedFormatterStartIndex != -1)
{
if (c == '(')
{
var emptyName = (namedFormatterStartIndex == i);
if (emptyName)
{
namedFormatterStartIndex = -1;
continue;
}
namedFormatterOptionsStartIndex = i;
}
else if (c == ')' || c == ':')
{
if (c == ')')
{
var hasOpeningParenthesis = (namedFormatterOptionsStartIndex != -1);
// ensure no trailing chars past ')'
var nextI = i + 1;
var nextCharIsValid = (nextI < format.Length && (format[nextI] == ':' || format[nextI] == closingBrace));
if (!hasOpeningParenthesis || !nextCharIsValid)
{
namedFormatterStartIndex = -1;
continue;
}
namedFormatterOptionsEndIndex = i;
if (format[nextI] == ':')
{
i++; // Consume the ':'
}
}
var nameIsEmpty = (namedFormatterStartIndex == i);
var missingClosingParenthesis = (namedFormatterOptionsStartIndex != -1 && namedFormatterOptionsEndIndex == -1);
if (nameIsEmpty || missingClosingParenthesis)
{
namedFormatterStartIndex = -1;
continue;
}
lastI = i + 1;
var parentPlaceholder = current.parent;
if (namedFormatterOptionsStartIndex == -1)
{
var formatterName = format.Substring(namedFormatterStartIndex, i - namedFormatterStartIndex);
if (FormatterNameExists(formatterName, formatterExtensionNames))
{
parentPlaceholder.FormatterName = formatterName;
}
else
{
lastI = current.startIndex;
}
}
else
{
var formatterName = format.Substring(namedFormatterStartIndex, namedFormatterOptionsStartIndex - namedFormatterStartIndex);
if (FormatterNameExists(formatterName, formatterExtensionNames))
{
parentPlaceholder.FormatterName = formatterName;
parentPlaceholder.FormatterOptions = format.Substring(namedFormatterOptionsStartIndex + 1, namedFormatterOptionsEndIndex - (namedFormatterOptionsStartIndex + 1));
}
else
{
lastI = current.startIndex;
}
}
current.startIndex = lastI;
namedFormatterStartIndex = -1;
}
}
}
else
{
// Placeholder is NOT null, so that means
// we're parsing the selectors:
if (_operators.IndexOf(c) != -1)
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(Settings, format, lastI, i, operatorIndex, selectorIndex));
selectorIndex++;
operatorIndex = i;
}
lastI = i + 1;
}
else if (c == ':')
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(Settings, format, lastI, i, operatorIndex, selectorIndex));
}
else if (operatorIndex != i)
{
// There are trailing operators. For now, this is an error.
parsingErrors.AddIssue(current, parsingErrorText[ParsingError.TrailingOperatorsInSelector], operatorIndex, i);
OnParsingFailure?.Invoke(this, new ParsingErrorEventArgs(current.RawText, operatorIndex, i + 1, ParsingError.TrailingOperatorsInSelector, Settings.ParseErrorAction != ErrorAction.ThrowError));
}
lastI = i + 1;
// Start the format:
currentPlaceholder.Format = new Format(Settings, currentPlaceholder, i + 1);
current = currentPlaceholder.Format;
currentPlaceholder = null;
namedFormatterStartIndex = lastI;
namedFormatterOptionsStartIndex = -1;
namedFormatterOptionsEndIndex = -1;
}
else if (c == closingBrace)
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(Settings, format, lastI, i, operatorIndex, selectorIndex));
}
else if (operatorIndex != i)
{
// There are trailing operators. For now, this is an error.
parsingErrors.AddIssue(current, parsingErrorText[ParsingError.TrailingOperatorsInSelector], operatorIndex, i);
OnParsingFailure?.Invoke(this, new ParsingErrorEventArgs(current.RawText, operatorIndex, i, ParsingError.TrailingOperatorsInSelector, Settings.ParseErrorAction != ErrorAction.ThrowError));
}
lastI = i + 1;
// End the placeholder with no format:
nestedDepth--;
currentPlaceholder.endIndex = i + 1;
current = currentPlaceholder.parent;
currentPlaceholder = null;
}
else
{
// Let's make sure the selector characters are valid:
// Make sure it's alphanumeric:
var isValidSelectorChar =
('0' <= c && c <= '9') ||
(_alphanumericSelectors && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z')) ||
(_allowedSelectorChars.IndexOf(c) != -1);
if (!isValidSelectorChar)
{
// Invalid character in the selector.
parsingErrors.AddIssue(current, parsingErrorText[ParsingError.InvalidCharactersInSelector], i, i + 1);
OnParsingFailure?.Invoke(this, new ParsingErrorEventArgs(current.RawText, i, i + 1, ParsingError.InvalidCharactersInSelector, Settings.ParseErrorAction != ErrorAction.ThrowError));
}
}
}
}
// finish the last text item:
if (lastI != format.Length)
{
current.Items.Add(new LiteralText(Settings, current, lastI)
{
endIndex = format.Length
});
}
// Check that the format is finished:
if (current.parent != null || currentPlaceholder != null)
{
parsingErrors.AddIssue(current, parsingErrorText[ParsingError.MissingClosingBrace], format.Length, format.Length);
OnParsingFailure?.Invoke(this, new ParsingErrorEventArgs(current.RawText, format.Length, format.Length, ParsingError.MissingClosingBrace, Settings.ParseErrorAction != ErrorAction.ThrowError));
current.endIndex = format.Length;
while (current.parent != null)
{
current = current.parent.parent;
current.endIndex = format.Length;
}
}
// Check if there were any parsing errors:
if (parsingErrors.HasIssues && Settings.ParseErrorAction == ErrorAction.ThrowError)
{
throw parsingErrors;
}
return(result);
}
public Format ParseFormat(string format)
{
var result = new Format(format);
var current = result;
Placeholder currentPlaceholder = null;
var namedFormatterStartIndex = -1;
var namedFormatterOptionsStartIndex = -1;
var namedFormatterOptionsEndIndex = -1;
// Store parsing errors until the end:
var parsingErrors = new ParsingErrors(result);
// Cache properties:
var openingBrace = this.openingBrace;
var closingBrace = this.closingBrace;
int nestedDepth = 0;
int lastI = 0;
int operatorIndex = 0;
int selectorIndex = 0;
for (int i = 0, length = format.Length; i < length; i++)
{
var c = format[i];
if (currentPlaceholder == null)
{
if (c == openingBrace)
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
// See if this brace should be escaped:
if (!this.alternativeEscaping)
{
var nextI = lastI;
if (nextI < length && format[nextI] == openingBrace)
{
i++;
continue;
}
}
// New placeholder:
nestedDepth++;
currentPlaceholder = new Placeholder(current, i, nestedDepth);
current.Items.Add(currentPlaceholder);
current.HasNested = true;
operatorIndex = i + 1;
selectorIndex = 0;
namedFormatterStartIndex = -1;
}
else if (c == closingBrace)
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
// See if this brace should be escaped:
if (!this.alternativeEscaping)
{
var nextI = lastI;
if (nextI < length && format[nextI] == closingBrace)
{
i++;
continue;
}
}
// Make sure that this is a nested placeholder before we un-nest it:
if (current.parent == null)
{
parsingErrors.AddIssue(current, "Format string has too many closing braces", i, i + 1);
continue;
}
// End of the placeholder's Format:
nestedDepth--;
current.endIndex = i;
current.parent.endIndex = i + 1;
current = current.parent.parent;
namedFormatterStartIndex = -1;
}
else if (this.alternativeEscaping && c == this.alternativeEscapeChar)
{
namedFormatterStartIndex = -1;
// See if the next char is a brace that should be escaped:
var nextI = i + 1;
if (nextI < length && (format[nextI] == openingBrace || format[nextI] == closingBrace))
{
// Finish the last text item:
if (i != lastI)
{
current.Items.Add(new LiteralText(current, lastI)
{
endIndex = i
});
}
lastI = i + 1;
i++;
continue;
}
}
else if (namedFormatterStartIndex != -1)
{
if (c == '(')
{
var emptyName = (namedFormatterStartIndex == i);
if (emptyName)
{
namedFormatterStartIndex = -1;
continue;
}
namedFormatterOptionsStartIndex = i;
}
else if (c == ')' || c == ':')
{
if (c == ')')
{
var hasOpeningParenthesis = (namedFormatterOptionsStartIndex != -1);
// ensure no trailing chars past ')'
var nextI = i + 1;
var nextCharIsValid = (nextI < format.Length && (format[nextI] == ':' || format[nextI] == closingBrace));
if (!hasOpeningParenthesis || !nextCharIsValid)
{
namedFormatterStartIndex = -1;
continue;
}
namedFormatterOptionsEndIndex = i;
if (format[nextI] == ':')
{
i++; // Consume the ':'
}
}
var nameIsEmpty = (namedFormatterStartIndex == i);
var missingClosingParenthesis = (namedFormatterOptionsStartIndex != -1 && namedFormatterOptionsEndIndex == -1);
if (nameIsEmpty || missingClosingParenthesis)
{
namedFormatterStartIndex = -1;
continue;
}
lastI = i + 1;
var parentPlaceholder = current.parent;
if (namedFormatterOptionsStartIndex == -1)
{
parentPlaceholder.FormatterName = format.Substring(namedFormatterStartIndex, i - namedFormatterStartIndex);
}
else
{
parentPlaceholder.FormatterName = format.Substring(namedFormatterStartIndex, namedFormatterOptionsStartIndex - namedFormatterStartIndex);
parentPlaceholder.FormatterOptions = format.Substring(namedFormatterOptionsStartIndex + 1, namedFormatterOptionsEndIndex - (namedFormatterOptionsStartIndex + 1));
}
current.startIndex = lastI;
namedFormatterStartIndex = -1;
}
}
}
else
{
// Placeholder is NOT null, so that means
// we're parsing the selectors:
if (operators.IndexOf(c) != -1)
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(format, lastI, i, operatorIndex, selectorIndex));
selectorIndex++;
operatorIndex = i;
}
lastI = i + 1;
}
else if (c == ':')
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(format, lastI, i, operatorIndex, selectorIndex));
}
else if (operatorIndex != i)
{
// There are trailing operators. For now, this is an error.
parsingErrors.AddIssue(current, "There are trailing operators in the selector", operatorIndex, i);
}
lastI = i + 1;
// Start the format:
currentPlaceholder.Format = new Format(currentPlaceholder, i + 1);
current = currentPlaceholder.Format;
currentPlaceholder = null;
namedFormatterStartIndex = lastI;
namedFormatterOptionsStartIndex = -1;
namedFormatterOptionsEndIndex = -1;
}
else if (c == closingBrace)
{
// Add the selector:
if (i != lastI)
{
currentPlaceholder.Selectors.Add(new Selector(format, lastI, i, operatorIndex, selectorIndex));
}
else if (operatorIndex != i)
{
// There are trailing operators. For now, this is an error.
parsingErrors.AddIssue(current, "There are trailing operators in the selector", operatorIndex, i);
}
lastI = i + 1;
// End the placeholder with no format:
nestedDepth--;
currentPlaceholder.endIndex = i + 1;
current = currentPlaceholder.parent;
currentPlaceholder = null;
}
else
{
// Let's make sure the selector characters are valid:
// Make sure it's alphanumeric:
var isValidSelectorChar =
('0' <= c && c <= '9') ||
(alphanumericSelectors && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z')) ||
(allowedSelectorChars.IndexOf(c) != -1);
if (!isValidSelectorChar)
{
// Invalid character in the selector.
parsingErrors.AddIssue(current, "Invalid character in the selector", i, i + 1);
}
}
}
}
// finish the last text item:
if (lastI != format.Length)
{
current.Items.Add(new LiteralText(current, lastI)
{
endIndex = format.Length
});
}
// Check that the format is finished:
if (current.parent != null || currentPlaceholder != null)
{
parsingErrors.AddIssue(current, "Format string is missing a closing brace", format.Length, format.Length);
current.endIndex = format.Length;
while (current.parent != null)
{
current = current.parent.parent;
current.endIndex = format.Length;
}
}
// Check if there were any parsing errors:
if (parsingErrors.HasIssues && ErrorAction == ErrorAction.ThrowError)
{
throw parsingErrors;
}
return(result);
}
