private static void ThrowIfContainsNonStringLiteralExpression(StringConcatenationAnalysis analysis)
{
if (analysis.ContainsNonStringLiteral)
{
throw new InvalidOperationException("String concatenation contains an expression that is not a string literal.");
}
}
internal LiteralExpressionSyntax ToStringLiteralExpression()
{
ThrowInvalidOperationIfNotInitialized();
StringConcatenationAnalysis analysis = Analyze();
ThrowIfContainsNonStringLiteralExpression(analysis);
StringBuilder sb = StringBuilderCache.GetInstance();
if (!analysis.ContainsNonVerbatimExpression)
{
sb.Append('@');
}
sb.Append('"');
foreach (ExpressionSyntax expression in Expressions(leftToRight: true))
{
StringLiteralExpressionInfo literal = SyntaxInfo.StringLiteralExpressionInfo(expression);
if (literal.Success)
{
if (analysis.ContainsNonVerbatimExpression && literal.IsVerbatim)
{
int startIndex = sb.Length;
sb.Append(literal.ValueText);
sb.Replace(@"\", @"\\", startIndex);
sb.Replace("\"", @"\" + "\"", startIndex);
sb.Replace("\n", @"\n", startIndex);
sb.Replace("\r", @"\r", startIndex);
}
else
{
sb.Append(literal.InnerText);
}
}
}
sb.Append('"');
return((LiteralExpressionSyntax)ParseExpression(StringBuilderCache.GetStringAndFree(sb)));
}
internal StringConcatenationAnalysis Analyze()
{
return(StringConcatenationAnalysis.Create(this));
}