// routines related to "reconstructing" the syntax tree from the saved tokens to do context checks
/// <summary>
/// Returns the context object for the given token index, ignoring empty fragments.
/// Throws an ArgumentNullException if the given token index is null.
/// </summary>
private static Context.SyntaxTokenContext GetContext(this CodeFragment.TokenIndex tokenIndex)
{
if (tokenIndex == null)
{
throw new ArgumentNullException(nameof(tokenIndex));
}
QsNullable <QsFragmentKind> Nullable(CodeFragment fragment) =>
fragment?.Kind == null
? QsNullable <QsFragmentKind> .Null
: fragment.IncludeInCompilation
? QsNullable <QsFragmentKind> .NewValue(fragment.Kind)
: QsNullable <QsFragmentKind> .NewValue(QsFragmentKind.InvalidFragment);
var self = tokenIndex.GetFragment();
var previous = tokenIndex.PreviousOnScope()?.GetFragment(); // excludes empty tokens
var next = tokenIndex.NextOnScope()?.GetFragment(); // excludes empty tokens
var parents = tokenIndex.GetNonEmptyParents().Select(tIndex => Nullable(tIndex.GetFragment())).ToArray();
var nullableSelf = self?.Kind == null // special treatment such that errors for fragments excluded from compilation still get logged...
? QsNullable <QsFragmentKind> .Null
: QsNullable <QsFragmentKind> .NewValue(self.Kind);
var headerRange = self?.HeaderRange ?? QsCompilerDiagnostic.DefaultRange;
return(new Context.SyntaxTokenContext(headerRange, nullableSelf, Nullable(previous), Nullable(next), parents));
}
// routines related to "reconstructing" the syntax tree from the saved tokens to do context checks
/// <summary>
/// Returns the context object for the given token index, ignoring empty fragments.
/// </summary>
private static Context.SyntaxTokenContext GetContext(this CodeFragment.TokenIndex tokenIndex)
{
QsNullable <QsFragmentKind> Nullable(CodeFragment?token, bool precedesSelf) =>
token?.Kind == null
? QsNullable <QsFragmentKind> .Null
: precedesSelf && !token.IncludeInCompilation // fragments that *follow * self need to be re-evaluated first
? QsNullable <QsFragmentKind> .NewValue(QsFragmentKind.InvalidFragment)
: QsNullable <QsFragmentKind> .NewValue(token.Kind);
var fragment = tokenIndex.GetFragment();
var headerRange = fragment?.HeaderRange ?? Range.Zero;
var self = Nullable(fragment, false); // making sure that errors for fragments excluded from compilation still get logged
var previous = Nullable(tokenIndex.PreviousOnScope()?.GetFragment(), true); // excludes empty tokens
var next = Nullable(tokenIndex.NextOnScope()?.GetFragment(), false); // excludes empty tokens
var parents = tokenIndex.GetNonEmptyParents().Select(tIndex => Nullable(tIndex.GetFragment(), true)).ToArray();
return(new Context.SyntaxTokenContext(headerRange, self, previous, next, parents));
}