[PATCH] D123682: [clang-tblgen] Automatically document options values

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serge-sans-paille created this revision.
serge-sans-paille added a reviewer: MaskRay.
Herald added a subscriber: StephenFan.
Herald added a project: All.
serge-sans-paille requested review of this revision.
Herald added a project: clang.
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This is a port of f5c666742f7bb4ae79ec79c8acf61dced4d37cc9 <https://reviews.llvm.org/rGf5c666742f7bb4ae79ec79c8acf61dced4d37cc9> to clang's tablegen.
The code duplication is a bit sad there :-/

Related to https://reviews.llvm.org/D122378


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123682

Files:
  clang/utils/TableGen/ClangOptionDocEmitter.cpp


Index: clang/utils/TableGen/ClangOptionDocEmitter.cpp
===================================================================
--- clang/utils/TableGen/ClangOptionDocEmitter.cpp
+++ clang/utils/TableGen/ClangOptionDocEmitter.cpp
@@ -238,6 +238,8 @@
   }
 }
 
+static StringRef DefaultMetaVarName = "<arg>";
+
 void emitOptionName(StringRef Prefix, const Record *Option, raw_ostream &OS) {
   // Find the arguments to list after the option.
   unsigned NumArgs = getNumArgsForKind(Option->getValueAsDef("Kind"), Option);
@@ -247,7 +249,7 @@
   if (HasMetaVarName)
     Args.push_back(std::string(Option->getValueAsString("MetaVarName")));
   else if (NumArgs == 1)
-    Args.push_back("<arg>");
+    Args.push_back(DefaultMetaVarName.str());
 
   // Fill up arguments if this option didn't provide a meta var name or it
   // supports an unlimited number of arguments. We can't see how many arguments
@@ -341,8 +343,33 @@
   OS << "\n\n";
 
   // Emit the description, if we have one.
+  const Record *R = Option.Option;
   std::string Description =
-      getRSTStringWithTextFallback(Option.Option, "DocBrief", "HelpText");
+      getRSTStringWithTextFallback(R, "DocBrief", "HelpText");
+
+  if (!isa<UnsetInit>(R->getValueInit("Values"))) {
+    if (!Description.empty() && Description.back() != '.')
+      Description.push_back('.');
+
+    StringRef MetaVarName;
+    if (!isa<UnsetInit>(R->getValueInit("MetaVarName")))
+      MetaVarName = R->getValueAsString("MetaVarName");
+    else
+      MetaVarName = DefaultMetaVarName;
+
+    SmallVector<StringRef> Values;
+    SplitString(R->getValueAsString("Values"), Values, ",");
+    Description += (" " + MetaVarName + " can be ").str();
+
+    if (Values.size() == 1) {
+      Description += ("'" + Values.front() + "'.").str();
+    } else {
+      Description += "one of '";
+      Description += join(Values.begin(), Values.end() - 1, "', '");
+      Description += ("' or '" + Values.back() + "'.").str();
+    }
+  }
+
   if (!Description.empty())
     OS << Description << "\n\n";
 }


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