private static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxTree syntaxTree, SyntaxTriviaList leadingTrivia)
{
var triviaSpan = syntaxTree.GetLineSpan(leadingTrivia.FullSpan);
// There is no indentation when the leading trivia doesn't begin at the start of the line.
if ((triviaSpan.StartLinePosition == triviaSpan.EndLinePosition) && (triviaSpan.StartLinePosition.Character > 0))
{
return(0);
}
var builder = StringBuilderPool.Allocate();
foreach (SyntaxTrivia trivia in leadingTrivia.Reverse())
{
if (!trivia.IsKind(SyntaxKind.WhitespaceTrivia))
{
break;
}
builder.Insert(0, trivia.ToFullString());
}
var tabSize = indentationOptions.TabSize;
var indentationCount = 0;
for (var i = 0; i < builder.Length; i++)
{
indentationCount += builder[i] == '\t' ? tabSize - (indentationCount % tabSize) : 1;
}
StringBuilderPool.ReturnAndFree(builder);
return((indentationCount + (indentationOptions.IndentationSize / 2)) / indentationOptions.IndentationSize);
}
/// <summary>
/// Gets a whitespace trivia containing the proper amount of indentation for new lines in the query of which the given token is a part.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="token">A token within a query expression.</param>
/// <returns>A whitespace trivia containing the proper amount of indentation.</returns>
internal static SyntaxTrivia GetQueryIndentationTrivia(IndentationOptions indentationOptions, SyntaxToken token)
{
var currentNode = token.Parent;
while (!currentNode.IsKind(SyntaxKind.QueryExpression))
{
currentNode = currentNode.Parent;
}
return GetQueryIndentationTrivia(indentationOptions, (QueryExpressionSyntax)currentNode);
}
/// <summary>
/// Gets a whitespace trivia containing the proper amount of indentation for new lines in the query of which the given token is a part.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="token">A token within a query expression.</param>
/// <returns>A whitespace trivia containing the proper amount of indentation.</returns>
internal static SyntaxTrivia GetQueryIndentationTrivia(IndentationOptions indentationOptions, SyntaxToken token)
{
var currentNode = token.Parent;
while (!currentNode.IsKind(SyntaxKind.QueryExpression))
{
currentNode = currentNode.Parent;
}
return(GetQueryIndentationTrivia(indentationOptions, (QueryExpressionSyntax)currentNode));
}
/// <summary>
/// Gets a whitespace trivia containing the proper amount of indentation for new lines in the given query.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="queryExpression">The query expression to determine indentation from.</param>
/// <returns>A whitespace trivia containing the proper amount of indentation.</returns>
internal static SyntaxTrivia GetQueryIndentationTrivia(IndentationOptions indentationOptions, QueryExpressionSyntax queryExpression)
{
var firstTokenOnTextLine = IndentationHelper.GetFirstTokenOnTextLine(queryExpression.FromClause.FromKeyword);
var indentationSteps = IndentationHelper.GetIndentationSteps(indentationOptions, firstTokenOnTextLine);
// add an extra indentation step when the first from clause is not properly indented yet
if (!firstTokenOnTextLine.IsKind(SyntaxKind.OpenParenToken) && (firstTokenOnTextLine != queryExpression.FromClause.FromKeyword))
{
indentationSteps++;
}
return IndentationHelper.GenerateWhitespaceTrivia(indentationOptions, indentationSteps);
}
/// <summary>
/// Gets a whitespace trivia containing the proper amount of indentation for new lines in the given query.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="queryExpression">The query expression to determine indentation from.</param>
/// <returns>A whitespace trivia containing the proper amount of indentation.</returns>
internal static SyntaxTrivia GetQueryIndentationTrivia(IndentationOptions indentationOptions, QueryExpressionSyntax queryExpression)
{
var firstTokenOnTextLine = IndentationHelper.GetFirstTokenOnTextLine(queryExpression.FromClause.FromKeyword);
var indentationSteps = IndentationHelper.GetIndentationSteps(indentationOptions, firstTokenOnTextLine);
// add an extra indentation step when the first from clause is not properly indented yet
if (!firstTokenOnTextLine.IsKind(SyntaxKind.OpenParenToken) && (firstTokenOnTextLine != queryExpression.FromClause.FromKeyword))
{
indentationSteps++;
}
return(IndentationHelper.GenerateWhitespaceTrivia(indentationOptions, indentationSteps));
}
/// <summary>
/// Generate a new indentation string.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="indentationSteps">The number of indentation steps.</param>
/// <returns>A string containing the amount of whitespace needed for the given indentation steps.</returns>
public static string GenerateIndentationString(IndentationOptions indentationOptions, int indentationSteps)
{
string result;
var indentationCount = indentationSteps * indentationOptions.IndentationSize;
if (indentationOptions.UseTabs)
{
var tabCount = indentationCount / indentationOptions.TabSize;
var spaceCount = indentationCount % indentationOptions.TabSize;
result = new string('\t', tabCount) + new string(' ', spaceCount);
}
else
{
result = new string(' ', indentationCount);
}
return result;
}
/// <summary>
/// Generate a new indentation string.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="indentationSteps">The number of indentation steps.</param>
/// <returns>A string containing the amount of whitespace needed for the given indentation steps.</returns>
public static string GenerateIndentationString(IndentationOptions indentationOptions, int indentationSteps)
{
string result;
var indentationCount = indentationSteps * indentationOptions.IndentationSize;
if (indentationOptions.UseTabs)
{
var tabCount = indentationCount / indentationOptions.TabSize;
var spaceCount = indentationCount % indentationOptions.TabSize;
result = new string('\t', tabCount) + new string(' ', spaceCount);
}
else
{
result = new string(' ', indentationCount);
}
return(result);
}
private static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxTree syntaxTree, SyntaxTriviaList leadingTrivia)
{
var triviaSpan = syntaxTree.GetLineSpan(leadingTrivia.FullSpan);
// There is no indentation when the leading trivia doesn't begin at the start of the line.
if ((triviaSpan.StartLinePosition == triviaSpan.EndLinePosition) && (triviaSpan.StartLinePosition.Character > 0))
{
return 0;
}
var builder = StringBuilderPool.Allocate();
foreach (SyntaxTrivia trivia in leadingTrivia.Reverse())
{
if (!trivia.IsKind(SyntaxKind.WhitespaceTrivia))
{
break;
}
builder.Insert(0, trivia.ToFullString());
}
var tabSize = indentationOptions.TabSize;
var indentationCount = 0;
for (var i = 0; i < builder.Length; i++)
{
indentationCount += builder[i] == '\t' ? tabSize - (indentationCount % tabSize) : 1;
}
StringBuilderPool.ReturnAndFree(builder);
return (indentationCount + (indentationOptions.IndentationSize / 2)) / indentationOptions.IndentationSize;
}
/// <summary>
/// Generates a whitespace trivia with the requested indentation.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="indentationSteps">The amount of indentation steps.</param>
/// <returns>A <see cref="SyntaxTrivia"/> containing the indentation whitespace.</returns>
public static SyntaxTrivia GenerateWhitespaceTrivia(IndentationOptions indentationOptions, int indentationSteps)
{
return SyntaxFactory.Whitespace(GenerateIndentationString(indentationOptions, indentationSteps));
}
/// <summary>
/// Gets the number of steps that the given token is indented.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="token">The token to inspect.</param>
/// <returns>The number of steps that the token is indented.</returns>
public static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxToken token)
{
return GetIndentationSteps(indentationOptions, token.SyntaxTree, token.LeadingTrivia);
}
/// <summary>
/// Gets the number of steps that the given node is indented.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="node">The node to inspect.</param>
/// <returns>The number of steps that the node is indented.</returns>
public static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxNode node)
{
return GetIndentationSteps(indentationOptions, node.SyntaxTree, node.GetLeadingTrivia());
}
/// <summary>
/// Generates a whitespace trivia with the requested indentation.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="indentationSteps">The amount of indentation steps.</param>
/// <returns>A <see cref="SyntaxTrivia"/> containing the indentation whitespace.</returns>
public static SyntaxTrivia GenerateWhitespaceTrivia(IndentationOptions indentationOptions, int indentationSteps)
{
return(SyntaxFactory.Whitespace(GenerateIndentationString(indentationOptions, indentationSteps)));
}
/// <summary>
/// Gets the number of steps that the given token is indented.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="token">The token to inspect.</param>
/// <returns>The number of steps that the token is indented.</returns>
public static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxToken token)
{
return(GetIndentationSteps(indentationOptions, token.SyntaxTree, token.LeadingTrivia));
}
/// <summary>
/// Gets the number of steps that the given node is indented.
/// </summary>
/// <param name="indentationOptions">The indentation options to use.</param>
/// <param name="node">The node to inspect.</param>
/// <returns>The number of steps that the node is indented.</returns>
public static int GetIndentationSteps(IndentationOptions indentationOptions, SyntaxNode node)
{
return(GetIndentationSteps(indentationOptions, node.SyntaxTree, node.GetLeadingTrivia()));
}