public void TestPathLikeVariableDeclaration(InterpolationKind kind, string expected)
{
var statement = SyntaxFactory.PathLikeConstVariableDeclaration("foo", kind, "someLiteral");
var text = statement.ToDisplayString();
Assert.Equal(expected, text);
}
/// <summary>
/// Returns a factory name for a given <paramref name="kind"/>.
/// </summary>
public static string GetIdentifierName(this InterpolationKind kind)
{
switch (kind)
{
case InterpolationKind.StringInterpolation:
// This is a legit case
return(string.Empty);
case InterpolationKind.PathInterpolation:
return(new string(Names.PathInterpolationFactory, 1));
case InterpolationKind.FileInterpolation:
return(new string(Names.FileInterpolationFactory, 1));
case InterpolationKind.DirectoryInterpolation:
return(new string(Names.DirectoryInterpolationFactory, 1));
case InterpolationKind.PathAtomInterpolation:
return(new string(Names.PathAtomInterpolationFactory, 1));
case InterpolationKind.RelativePathInterpolation:
return(new string(Names.RelativePathInterpolationFactory, 1));
default:
throw new ArgumentOutOfRangeException(nameof(kind), I($"Unknown interpolation kind '{kind}'."));
}
}
internal static InterpolationOperation DeserializeInterpolationOperation(JsonElement element)
{
Optional <InterpolationKind> kind = default;
Optional <InterpolationBoundary> boundary = default;
foreach (var property in element.EnumerateObject())
{
if (property.NameEquals("kind"))
{
if (property.Value.ValueKind == JsonValueKind.Null)
{
property.ThrowNonNullablePropertyIsNull();
continue;
}
kind = new InterpolationKind(property.Value.GetString());
continue;
}
if (property.NameEquals("boundary"))
{
if (property.Value.ValueKind == JsonValueKind.Null)
{
property.ThrowNonNullablePropertyIsNull();
continue;
}
boundary = InterpolationBoundary.DeserializeInterpolationBoundary(property.Value);
continue;
}
}
return(new InterpolationOperation(Optional.ToNullable(kind), boundary.Value));
}
public ProcessedTagTemplateExpression(
ITaggedTemplateExpression taggedTemplate,
InterpolationKind kind,
ILiteralExpression literal,
ITemplateLiteralFragment head,
INodeArray <ITemplateSpan> templateSpans)
{
Contract.Requires(taggedTemplate != null);
Contract.Requires(
kind == InterpolationKind.Unknown || (literal != null || (head != null && templateSpans != null)),
"If interpolation is a well-known factory method, then Literal or Head+Templates should be valid.");
TaggedTemplate = taggedTemplate;
Kind = kind;
Literal = literal;
Head = head;
TemplateSpans = templateSpans;
}
/// <summary> Generic interpolator - from start to end in <paramref name="t" />. </summary>
/// <param name="start">Starting position</param>
/// <param name="end">Ending position.</param>
/// <param name="t">
/// Amount to interpolate between the two values. 0 means <paramref name="start" /> and 1 means
/// <paramref name="end" />. Must be between 0.0 and 1.0.
/// </param>
/// <param name="kind">Interpolation type.</param>
/// <returns>Position between start and end for the given <paramref name="t" />.</returns>
/// <exception cref="ArgumentException">Unknown interpolation kind.</exception>
public static double Do(double start, double end, double t,
InterpolationKind kind = InterpolationKind.Linear)
{
switch (kind)
{
case InterpolationKind.Linear:
break;
case InterpolationKind.Sin:
t = System.Math.Sin(t * PiOver2);
break;
case InterpolationKind.Cos:
t = 1 - System.Math.Cos(t * PiOver2);
break;
case InterpolationKind.Quadratic:
t = t * t;
break;
case InterpolationKind.Cubic:
t = t * t * t;
break;
case InterpolationKind.Smooth:
t = t * t * (3 - 2 * t);
break;
case InterpolationKind.Smoothest:
t = t * t * t * (t * (6 * t - 15) + 10);
break;
default:
throw new ArgumentException("Unknown interpolation kind.", nameof(kind));
}
return((end - start) * t + start);
}
/// <summary> Generic interpolator - from start to end in <paramref name="t" />. </summary>
/// <param name="start">Starting position</param>
/// <param name="end">Ending position.</param>
/// <param name="t">
/// Amount to interpolate between the two values. 0 means <paramref name="start" /> and 1 means
/// <paramref name="end" />. Must be between 0.0 and 1.0.
/// </param>
/// <param name="kind">Interpolation type.</param>
/// <returns>Position between start and end for the given <paramref name="t" />.</returns>
/// <exception cref="ArgumentException">Unknown interpolation kind.</exception>
public static float Do(float start, float end, float t, InterpolationKind kind = InterpolationKind.Linear)
{
switch (kind)
{
case InterpolationKind.Linear:
break;
case InterpolationKind.Sin:
t = (float)System.Math.Sin(t * PiOver2f);
break;
case InterpolationKind.Cos:
t = (float)(1 - System.Math.Cos(t * PiOver2f));
break;
case InterpolationKind.Quadratic:
t = t * t;
break;
case InterpolationKind.Cubic:
t = t * t * t;
break;
case InterpolationKind.Smooth:
t = t * t * (3f - 2f * t);
break;
case InterpolationKind.Smoothest:
t = t * t * t * (t * (6f * t - 15f) + 10f);
break;
default:
throw new ArgumentException("Unknown interpolation kind.", nameof(kind));
}
return((end - start) * t + start);
}
/// <summary>
/// Deconstructs a template expression.
/// </summary>
/// <remarks>
/// "pattern matches" a tagged template expression into two cases:
/// 1. Literal case like <code>p`string literal`</code> (in this case <paramref name="literal"/> would not be null).
/// 2. Template expression case like <code>p`{foo}</code> (in this case <paramref name="head"/> and <paramref name="templateSpans"/> are not null).
/// </remarks>
public static void Deconstruct(
[CanBeNull] this ITaggedTemplateExpression node,
out InterpolationKind kind,
out ILiteralExpression literal,
out ITemplateLiteralFragment head,
out INodeArray <ITemplateSpan> templateSpans)
{
kind = InterpolationKind.Unknown;
literal = null;
head = null;
templateSpans = null;
if (node == null)
{
return;
}
if (node.Tag.Kind != SyntaxKind.Identifier)
{
// Looks like the tagged expression is invalid.
return;
}
var text = node.Tag.Cast <IIdentifier>().Text;
kind = GetInterpolationKind(text);
if (kind == InterpolationKind.Unknown)
{
return;
}
literal = node.TemplateExpression.As <ILiteralExpression>();
if (literal == null)
{
// This is another case: tagged template actually has template expressions.
var template = node.TemplateExpression.Cast <ITemplateExpression>();
head = template.Head;
templateSpans = template?.TemplateSpans;
Contract.Assert(head != null);
Contract.Assert(templateSpans != null);
}
InterpolationKind GetInterpolationKind(string factoryName)
{
if (factoryName.Length == 0)
{
return(InterpolationKind.StringInterpolation);
}
var c = factoryName[0];
switch (c)
{
case Names.PathInterpolationFactory:
return(InterpolationKind.PathInterpolation);
case Names.DirectoryInterpolationFactory:
return(InterpolationKind.DirectoryInterpolation);
case Names.FileInterpolationFactory:
return(InterpolationKind.FileInterpolation);
case Names.RelativePathInterpolationFactory:
return(InterpolationKind.RelativePathInterpolation);
case Names.PathAtomInterpolationFactory:
return(InterpolationKind.PathAtomInterpolation);
default:
return(InterpolationKind.Unknown);
}
}
}
/// <summary>
/// Creates a path-like expression with a given kind and text.
/// </summary>
public static ITaggedTemplateExpression PathLikeLiteral(InterpolationKind kind, IExpression firstExpression, string literalText)
{
return(new TaggedTemplateExpression(kind.GetIdentifierName(), firstExpression, literalText));
}
/// <summary>
/// Creates a variable statement with path-like interpolation literal.
/// </summary>
public static IStatement PathLikeConstVariableDeclaration(string variableName, InterpolationKind kind, string literal, Visibility visibility = Visibility.None)
{
Contract.Requires(!string.IsNullOrEmpty(variableName));
Contract.Requires(kind != InterpolationKind.Unknown);
Contract.Requires(!string.IsNullOrEmpty(literal));
return(new VariableDeclarationBuilder()
.Const()
.Visibility(visibility)
.Name(variableName)
.Initializer(PathLikeLiteral(kind, literal))
.Build());
}