Support `include` for pulling file into the current module. (#3377)

* Support `include` for pulling file into the current module.

* Add auto-completion, hover info and goto-def support.

* Disable warning for missing `module` declaration for now.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/source/slang/slang-lookup.cpp b/source/slang/slang-lookup.cpp
index d71227b6c..ee4518c20 100644
--- a/source/slang/slang-lookup.cpp
+++ b/source/slang/slang-lookup.cpp
@@ -675,6 +675,10 @@ static void _lookUpInScopes(
     auto scope      = request.scope;
 
     auto endScope   = request.endScope;
+
+    // The file decl that this scope is in.
+    FileDecl* thisFileDecl = nullptr;
+
     for (;scope != endScope; scope = scope->parent)
     {
         // Note that we consider all "peer" scopes together,
@@ -693,6 +697,18 @@ static void _lookUpInScopes(
             if (!containerDecl)
                 continue;
 
+            if (auto fileDecl = as<FileDecl>(containerDecl))
+            {
+                if (!thisFileDecl)
+                    thisFileDecl = fileDecl;
+                else if (fileDecl == thisFileDecl)
+                {
+                    // If we have already looked up in this file decl,
+                    // we don't want to do so again.
+                    continue;
+                }
+            }
+
             // TODO: If we need default substitutions to be applied to
             // the `containerDecl`, then it might make sense to have
             // each `link` in the scope store a decl-ref instead of