Implements getFullyOriginalRange (#1107)

include/slang/text/SourceManager.h

@@ -120,6 +120,11 @@ class SLANG_EXPORT SourceManager {
     /// inside a macro. Otherwise just returns the location itself.
     SourceLocation getFullyOriginalLoc(SourceLocation location) const;
 
+    /// Build the original location range where source is written.
+    /// If there is a mismatch between resulting start and end files,
+    /// returns the original range instead.
+    SourceRange getFullyOriginalRange(SourceRange range) const;
+
     /// If the given location is a macro location, fully expands it out to its actual
     /// file expansion location. Otherwise just returns the location itself.
     SourceLocation getFullyExpandedLoc(SourceLocation location) const;

source/text/SourceManager.cpp

@@ -199,6 +199,12 @@ SourceLocation SourceManager::getFullyOriginalLoc(SourceLocation location) const
     return location;
 }
 
+SourceRange SourceManager::getFullyOriginalRange(SourceRange range) const {
+    SourceLocation start(getFullyOriginalLoc(range.start()));
+    SourceLocation end(getFullyOriginalLoc(range.end()));
+    return SourceRange(start, end);
+}
+
 SourceLocation SourceManager::getFullyExpandedLoc(SourceLocation location) const {
     std::shared_lock lock(mutex);
     return getFullyExpandedLocImpl(location, lock);