Feature/include refactor (#675)

* Refactor of path handling.
* Added PathInfo
* Changed ISlangFileSystem - such that has separate concepts of reading a file, getting a relative path and getting a canonical path
* Added support for getting a canonical path for windows/linux
* Made maps/testing around canonicalPaths
* User output remains around 'foundPath' - which is the same as before

* Small improvements around PathInfo
* Added a type and make constructors to make clear the different 'path' uses
* Fixed bug in findViewRecursively

* Checking and reporting for ignored #pragma once.

* Removed SLANG_PATH_TYPE_NONE as doesn't serve any useful purpose.

* Improve comments in slang.h aroung ISlangFileSystem

* Remove the need for <windows.h> in slang-io.cpp

* Ran premake5.

* Improvements and fixes around PathInfo.

* Fix typo on linix GetCanonical

* Make the ISlangFileSystem the same as before, and ISlangFileSystem contain the new methods.
Internally it always uses the ISlangFileSystemExt, and will wrap a ISlangFileSystem with WrapFileSystem, if it is determined (via queryInterface) that it doesn't implement the full interface.

1 files changed, 9 insertions, 3 deletions

diff --git a/source/slang/compiler.h b/source/slang/compiler.h
index a83d8b334..04508837f 100644
--- a/source/slang/compiler.h
+++ b/source/slang/compiler.h
@@ -13,6 +13,7 @@
 
 namespace Slang
 {
+    struct PathInfo;
     struct IncludeHandler;
     class CompileRequest;
     class ProgramLayout;
@@ -395,6 +396,11 @@ namespace Slang
         ///
         ComPtr<ISlangFileSystem> fileSystem;
 
+        /// The extended file system implementation. Will be set to a default implementation
+        /// if fileSystem is nullptr. Otherwise it will either be fileSystem's interface, 
+        /// or a wrapped impl that makes fileSystem operate as fileSystemExt
+        ComPtr<ISlangFileSystemExt> fileSystemExt;
+
         /// Load a file into memory using the configured file system.
         ///
         /// @param path The path to attempt to load from
@@ -454,14 +460,14 @@ namespace Slang
 
         RefPtr<ModuleDecl> loadModule(
             Name*               name,
-            String const&       path,
-            ISlangBlob*         sourceBlob,
+            const PathInfo&     filePathInfo,
+            ISlangBlob*         fileContentsBlob,
             SourceLoc const& loc);
 
         void loadParsedModule(
             RefPtr<TranslationUnitRequest> const&   translationUnit,
             Name*                                   name,
-            String const&                           path);
+            PathInfo const&                         pathInfo);
 
         RefPtr<ModuleDecl> findOrImportModule(
             Name*               name,