private StyleConstant ResolveReference(StyleCompileContext context, ConstReferenceNode constReference)
{
if (currentlyResolvingConstants.Contains(constReference.identifier))
{
throw new CompileException(constReference, "Circular dependency detected!");
}
for (int i = 0; i < context.constants.Count; i++)
{
StyleConstant constant = context.constants[i];
if (constant.name == constReference.identifier)
{
// reference resolved
return(constant);
}
}
// now we have to recursively resolve the reference of the reference:
// const x: string = @y; // we're here...
// const y: string = @z: // ....referencing this
// const z: string = "whatup"; // ...which will resolve to this.
if (context.constantsWithReferences.ContainsKey(constReference.identifier))
{
currentlyResolvingConstants.Add(constReference.identifier);
StyleConstant resolvedConstant = Resolve(context, context.constantsWithReferences[constReference.identifier]);
currentlyResolvingConstants.Remove(constReference.identifier);
return(resolvedConstant);
}
throw new CompileException(constReference, $"Could not resolve reference {constReference}. Known references are: " + context.PrintConstants());
}
public StyleCompileContext CreateContext(LightList <StyleASTNode> rootNodes, MaterialDatabase materialDatabase)
{
StyleCompileContext context = new StyleCompileContext(materialDatabase);
// first all imports must be collected as they can be referenced in exports and consts
for (int i = 0; i < rootNodes.size; i++)
{
switch (rootNodes[i])
{
case ImportNode importNode:
StyleSheet importedStyle = styleSheetImporter.ImportStyleSheetFromFile(importNode.source, materialDatabase);
LightList <StyleConstant> importedStyleConstants = new LightList <StyleConstant>(importedStyle.constants.Length);
for (int constantIndex = 0; constantIndex < importedStyle.constants.Length; constantIndex++)
{
StyleConstant importedStyleConstant = importedStyle.constants[constantIndex];
if (importedStyleConstant.exported)
{
importedStyleConstants.Add(importedStyleConstant);
}
}
context.importedStyleConstants.Add(importNode.alias, importedStyleConstants);
break;
}
}
// collect all constants that could be referenced
for (int index = 0; index < rootNodes.size; index++)
{
switch (rootNodes[index])
{
case ExportNode exportNode:
TransformConstNode(context, exportNode.constNode, true);
break;
case ConstNode constNode:
TransformConstNode(context, constNode, false);
break;
}
}
ResolveConstantReferences(context);
context.constantsWithReferences.Clear();
return(context);
}
private StyleConstant Resolve(StyleCompileContext context, StyleConstant constant)
{
// shortcut return for constants that have been resolved already
for (int index = 0; index < context.constants.Count; index++)
{
StyleConstant c = context.constants[index];
if (c.name == constant.name)
{
return(c);
}
}
StyleConstant referencedConstant;
if (constant.constReferenceNode.children.Count > 0)
{
if (context.importedStyleConstants.ContainsKey(constant.constReferenceNode.identifier))
{
DotAccessNode importedConstant = (DotAccessNode)constant.constReferenceNode.children[0];
referencedConstant = context.importedStyleConstants[constant.constReferenceNode.identifier]
.Find(importedConstant.propertyName, s_FindStyleConstant);
if (referencedConstant.name == null)
{
throw new CompileException(importedConstant, "Could not find referenced property in imported scope.");
}
}
else
{
throw new CompileException(constant.constReferenceNode, "Constants cannot reference members of other constants.");
}
}
else
{
referencedConstant = ResolveReference(context, constant.constReferenceNode);
}
StyleConstant styleConstant = new StyleConstant {
name = constant.name,
value = referencedConstant.value,
exported = constant.exported
};
context.constants.Add(styleConstant);
return(styleConstant);
}
/// <summary>
/// Returns a referenced StyleASTNode if the passed in node is a ReferenceNode.
/// Only called once all references have been resolved in the constants list.
/// </summary>
/// <param name="node">A node that can be a ReferenceNode or something else.</param>
/// <returns>The referenced node or the node itself if it's a regular one.</returns>
/// <exception cref="CompileException">thrown in case a reference cannot be resolved.</exception>
public StyleASTNode GetValueForReference(StyleASTNode node)
{
if (node is ConstReferenceNode referenceNode)
{
for (int index = 0; index < constants.Count; index++)
{
StyleConstant c = constants[index];
if (c.name == referenceNode.identifier)
{
return(c.value);
}
}
if (referenceNode.children.Count > 0)
{
if (importedStyleConstants.ContainsKey(referenceNode.identifier))
{
DotAccessNode importedConstant = (DotAccessNode)referenceNode.children[0];
StyleConstant importedStyleConstant = importedStyleConstants[referenceNode.identifier]
.Find(importedConstant.propertyName, s_FindStyleConstant);
if (importedStyleConstant.name == null)
{
throw new CompileException(importedConstant, $"Could not find referenced property '{importedConstant.propertyName}' in imported scope '{referenceNode.identifier}'.");
}
return(importedStyleConstant.value);
}
throw new CompileException(referenceNode, "Constants cannot reference members of other constants.");
}
throw new CompileException(referenceNode, $"Couldn't resolve reference {referenceNode}. Known references are: {PrintConstants()}");
}
return(node);
}
