/// <summary>
/// Creates a separated list of nodes from a sequence of nodes and a sequence of separator tokens.
/// </summary>
/// <typeparam name="TNode">The specific type of the element nodes.</typeparam>
/// <param name="nodes">A sequence of syntax nodes.</param>
/// <param name="separators">A sequence of token to be interleaved between the nodes. The number of tokens must
/// be one less than the number of nodes.</param>
public virtual SeparatedSyntaxList <TNode> SeparatedList <TNode>(IEnumerable <TNode> nodes, IEnumerable <SyntaxToken> separators) where TNode : SyntaxNode
{
// Interleave the nodes and the separators. The number of separators must be equal to or 1 less than the number of nodes or
// an argument exception is thrown.
if (nodes != null)
{
IEnumerator <TNode> enumerator = nodes.GetEnumerator();
SeparatedSyntaxListBuilder <TNode> builder = SeparatedSyntaxListBuilder <TNode> .Create();
if (separators != null)
{
foreach (SyntaxToken token in separators)
{
if (!enumerator.MoveNext())
{
throw new ArgumentException($"{nameof(nodes)} must not be empty.", nameof(nodes));
}
builder.Add(enumerator.Current);
builder.AddSeparator(token);
}
}
if (enumerator.MoveNext())
{
builder.Add(enumerator.Current);
if (enumerator.MoveNext())
{
throw new ArgumentException($"{nameof(separators)} must have 1 fewer element than {nameof(nodes)}", nameof(separators));
}
}
return(builder.ToList());
}
if (separators != null)
{
throw new ArgumentException($"When {nameof(nodes)} is null, {nameof(separators)} must also be null.", nameof(separators));
}
return(default(SeparatedSyntaxList <TNode>));
}
/// <summary>
/// Creates a separated list of nodes from a sequence of nodes, synthesizing comma separators in between.
/// </summary>
/// <typeparam name="TNode">The specific type of the element nodes.</typeparam>
/// <param name="nodes">A sequence of syntax nodes.</param>
public virtual SeparatedSyntaxList <TNode> SeparatedList <TNode>(IEnumerable <TNode> nodes, SyntaxKind separatorKind) where TNode : SyntaxNode
{
if (nodes == null)
{
return(default(SeparatedSyntaxList <TNode>));
}
var collection = nodes as ICollection <TNode>;
if (collection != null && collection.Count == 0)
{
return(default(SeparatedSyntaxList <TNode>));
}
using (var enumerator = nodes.GetEnumerator())
{
if (!enumerator.MoveNext())
{
return(default(SeparatedSyntaxList <TNode>));
}
var firstNode = enumerator.Current;
if (!enumerator.MoveNext())
{
return(SingletonSeparatedList <TNode>(firstNode));
}
var builder = new SeparatedSyntaxListBuilder <TNode>(collection != null ? collection.Count : 3);
builder.Add(firstNode);
var commaToken = Token(separatorKind);
do
{
builder.AddSeparator(commaToken);
builder.Add(enumerator.Current);
}while (enumerator.MoveNext());
return(builder.ToList());
}
}
private DirectiveTriviaSyntax ParsePragmaDirective(SyntaxToken hash, SyntaxToken pragma, bool isActive)
{
pragma = CheckFeatureAvailability(pragma, MessageID.IDS_FeaturePragma);
bool hasError = false;
if (this.CurrentToken.ContextualKind == SyntaxKind.WarningKeyword)
{
var warning = this.EatContextualToken(SyntaxKind.WarningKeyword);
SyntaxToken style;
if (this.CurrentToken.Kind == SyntaxKind.DisableKeyword || this.CurrentToken.Kind == SyntaxKind.RestoreKeyword)
{
style = this.EatToken();
var ids = new SeparatedSyntaxListBuilder<ExpressionSyntax>(10);
while (this.CurrentToken.Kind != SyntaxKind.EndOfDirectiveToken)
{
SyntaxToken id;
ExpressionSyntax idExpression;
if (this.CurrentToken.Kind == SyntaxKind.NumericLiteralToken)
{
// Previous versions of the compiler used to report a warning (CS1691)
// whenever an unrecognized warning code was supplied in a #pragma directive
// (or via /nowarn /warnaserror flags on the command line).
// Going forward, we won't generate any warning in such cases. This will make
// maintainance of backwards compatibility easier (we no longer need to worry
// about breaking existing projects / command lines if we deprecate / remove
// an old warning code).
id = this.EatToken();
idExpression = SyntaxFactory.LiteralExpression(SyntaxKind.NumericLiteralExpression, id);
}
else if (this.CurrentToken.Kind == SyntaxKind.IdentifierToken)
{
// Lexing / parsing of identifiers inside #pragma warning directives is identical
// to that inside #define directives except that very long identifiers inside #define
// are truncated to 128 characters to maintain backwards compatibility with previous
// versions of the compiler. (See TruncateIdentifier() below.)
// Since support for identifiers inside #pragma warning directivess is new,
// we don't have any backwards compatibility constraints. So we can preserve the
// identifier exactly as it appears in source.
id = this.EatToken();
idExpression = SyntaxFactory.IdentifierName(id);
}
else
{
id = this.EatToken(SyntaxKind.NumericLiteralToken, ErrorCode.WRN_IdentifierOrNumericLiteralExpected, reportError: isActive);
idExpression = SyntaxFactory.LiteralExpression(SyntaxKind.NumericLiteralExpression, id);
}
hasError = hasError || id.ContainsDiagnostics;
ids.Add(idExpression);
if (this.CurrentToken.Kind != SyntaxKind.CommaToken)
{
break;
}
ids.AddSeparator(this.EatToken());
}
var end = this.ParseEndOfDirective(hasError || !isActive, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, ids.ToList(), end, isActive);
}
else
{
style = this.EatToken(SyntaxKind.DisableKeyword, ErrorCode.WRN_IllegalPPWarning, reportError: isActive);
var end = this.ParseEndOfDirective(ignoreErrors: true, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, default(SeparatedSyntaxList<ExpressionSyntax>), end, isActive);
}
}
else if (this.CurrentToken.Kind == SyntaxKind.ChecksumKeyword)
{
var checksum = this.EatToken();
var file = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive);
var guid = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive && !file.IsMissing);
if (isActive && !guid.IsMissing)
{
Guid tmp;
if (!Guid.TryParse(guid.ValueText, out tmp))
{
guid = this.AddError(guid, ErrorCode.WRN_IllegalPPChecksum);
}
}
var bytes = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive && !guid.IsMissing);
if (isActive && !bytes.IsMissing)
{
if (bytes.ValueText.Length % 2 != 0)
{
bytes = this.AddError(bytes, ErrorCode.WRN_IllegalPPChecksum);
}
else
{
foreach (char c in bytes.ValueText)
{
if (!SyntaxFacts.IsHexDigit(c))
{
bytes = this.AddError(bytes, ErrorCode.WRN_IllegalPPChecksum);
break;
}
}
}
}
hasError = file.ContainsDiagnostics | guid.ContainsDiagnostics | bytes.ContainsDiagnostics;
var eod = this.ParseEndOfDirective(ignoreErrors: hasError, afterPragma: true);
return SyntaxFactory.PragmaChecksumDirectiveTrivia(hash, pragma, checksum, file, guid, bytes, eod, isActive);
}
else
{
var warning = this.EatToken(SyntaxKind.WarningKeyword, ErrorCode.WRN_IllegalPragma, reportError: isActive);
var style = this.EatToken(SyntaxKind.DisableKeyword, reportError: false);
var eod = this.ParseEndOfDirective(ignoreErrors: true, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, default(SeparatedSyntaxList<ExpressionSyntax>), eod, isActive);
}
}
private DirectiveTriviaSyntax ParsePragmaDirective(SyntaxToken hash, SyntaxToken pragma, bool isActive)
{
pragma = CheckFeatureAvailability(pragma, MessageID.IDS_FeaturePragma);
bool hasError = false;
if (this.CurrentToken.ContextualKind == SyntaxKind.WarningKeyword)
{
var warning = this.EatContextualToken(SyntaxKind.WarningKeyword);
SyntaxToken style;
if (this.CurrentToken.Kind == SyntaxKind.DisableKeyword || this.CurrentToken.Kind == SyntaxKind.RestoreKeyword)
{
style = this.EatToken();
var ids = new SeparatedSyntaxListBuilder<ExpressionSyntax>(10);
while (this.CurrentToken.Kind != SyntaxKind.EndOfDirectiveToken)
{
SyntaxToken id;
ExpressionSyntax idExpression;
if (this.CurrentToken.Kind == SyntaxKind.NumericLiteralToken || this.CurrentToken.Kind == SyntaxKind.StringLiteralToken)
{
id = this.EatToken();
if (isActive)
{
if (id.Kind == SyntaxKind.NumericLiteralToken)
{
int compilerWarningNumber = (int)id.Value;
if (ErrorFacts.GetSeverity((ErrorCode)compilerWarningNumber) != DiagnosticSeverity.Warning)
{
id = this.AddError(id, ErrorCode.WRN_BadWarningNumber, compilerWarningNumber);
}
}
else
{
string value = (string)id.Value;
var messageProvider = MessageProvider.Instance;
if (string.IsNullOrWhiteSpace(value))
{
id = this.AddError(id, ErrorCode.WRN_BadWarningNumber, value);
}
else if (value.StartsWith(messageProvider.CodePrefix))
{
// For diagnostic IDs of the form "CS[0-9]*", verify the error code is that of a warning
int compilerWarningNumber;
if (int.TryParse(value.Substring(messageProvider.CodePrefix.Length), NumberStyles.None, CultureInfo.InvariantCulture, out compilerWarningNumber) &&
(messageProvider.GetIdForErrorCode(compilerWarningNumber) != value ||
ErrorFacts.GetSeverity((ErrorCode)compilerWarningNumber) != DiagnosticSeverity.Warning))
{
id = this.AddError(id, ErrorCode.WRN_BadWarningNumber, value);
}
}
}
}
var expressionKind = id.Kind == SyntaxKind.NumericLiteralToken ? SyntaxKind.NumericLiteralExpression : SyntaxKind.StringLiteralExpression;
idExpression = SyntaxFactory.LiteralExpression(expressionKind, id);
}
else
{
id = this.EatToken(SyntaxKind.NumericLiteralToken, ErrorCode.WRN_StringOrNumericLiteralExpected, reportError: isActive);
idExpression = SyntaxFactory.LiteralExpression(SyntaxKind.NumericLiteralExpression, id);
}
hasError = hasError || id.ContainsDiagnostics;
ids.Add(idExpression);
if (this.CurrentToken.Kind != SyntaxKind.CommaToken)
{
break;
}
ids.AddSeparator(this.EatToken());
}
var end = this.ParseEndOfDirective(hasError || !isActive, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, ids.ToList(), end, isActive);
}
else
{
style = this.EatToken(SyntaxKind.DisableKeyword, ErrorCode.WRN_IllegalPPWarning, reportError: isActive);
var end = this.ParseEndOfDirective(ignoreErrors: true, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, default(SeparatedSyntaxList<ExpressionSyntax>), end, isActive);
}
}
else if (this.CurrentToken.Kind == SyntaxKind.ChecksumKeyword)
{
var checksum = this.EatToken();
var file = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive);
var guid = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive && !file.IsMissing);
if (isActive && !guid.IsMissing)
{
Guid tmp;
if (!Guid.TryParse(guid.ValueText, out tmp))
{
guid = this.AddError(guid, ErrorCode.WRN_IllegalPPChecksum);
}
}
var bytes = this.EatToken(SyntaxKind.StringLiteralToken, ErrorCode.WRN_IllegalPPChecksum, reportError: isActive && !guid.IsMissing);
if (isActive && !bytes.IsMissing)
{
if (bytes.ValueText.Length % 2 != 0)
{
bytes = this.AddError(bytes, ErrorCode.WRN_IllegalPPChecksum);
}
else
{
foreach (char c in bytes.ValueText)
{
if (!SyntaxFacts.IsHexDigit(c))
{
bytes = this.AddError(bytes, ErrorCode.WRN_IllegalPPChecksum);
break;
}
}
}
}
hasError = file.ContainsDiagnostics | guid.ContainsDiagnostics | bytes.ContainsDiagnostics;
var eod = this.ParseEndOfDirective(ignoreErrors: hasError, afterPragma: true);
return SyntaxFactory.PragmaChecksumDirectiveTrivia(hash, pragma, checksum, file, guid, bytes, eod, isActive);
}
else
{
var warning = this.EatToken(SyntaxKind.WarningKeyword, ErrorCode.WRN_IllegalPragma, reportError: isActive);
var style = this.EatToken(SyntaxKind.DisableKeyword, reportError: false);
var eod = this.ParseEndOfDirective(ignoreErrors: true, afterPragma: true);
return SyntaxFactory.PragmaWarningDirectiveTrivia(hash, pragma, warning, style, default(SeparatedSyntaxList<ExpressionSyntax>), eod, isActive);
}
}