clang-tools-extra/clang-doc/Generators.cpp

   1 //===-- Generators.cpp - Generator Registry ----------------------*- C++-*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "Generators.h"
  10
  11 LLVM_INSTANTIATE_REGISTRY(clang::doc::GeneratorRegistry)
  12
  13 namespace clang {
  14 namespace doc {
  15
  16 llvm::Expected<std::unique_ptr<Generator>>
  17 findGeneratorByName(llvm::StringRef Format) {
  18   for (const auto &Generator : GeneratorRegistry::entries()) {
  19     if (Generator.getName() != Format)
  20       continue;
  21     return Generator.instantiate();
  22   }
  23   return createStringError(llvm::inconvertibleErrorCode(),
  24                            "can't find generator: " + Format);
  25 }
  26
  27 // Enum conversion
  28
  29 std::string getTagType(TagTypeKind AS) {
  30   switch (AS) {
  31   case TagTypeKind::Class:
  32     return "class";
  33   case TagTypeKind::Union:
  34     return "union";
  35   case TagTypeKind::Interface:
  36     return "interface";
  37   case TagTypeKind::Struct:
  38     return "struct";
  39   case TagTypeKind::Enum:
  40     return "enum";
  41   }
  42   llvm_unreachable("Unknown TagTypeKind");
  43 }
  44
  45 llvm::Error Generator::createResources(ClangDocContext &CDCtx) {
  46   return llvm::Error::success();
  47 }
  48
  49 // A function to add a reference to Info in Idx.
  50 // Given an Info X with the following namespaces: [B,A]; a reference to X will
  51 // be added in the children of a reference to B, which should be also a child of
  52 // a reference to A, where A is a child of Idx.
  53 //   Idx
  54 //    |-- A
  55 //        |--B
  56 //           |--X
  57 // If the references to the namespaces do not exist, they will be created. If
  58 // the references already exist, the same one will be used.
  59 void Generator::addInfoToIndex(Index &Idx, const doc::Info *Info) {
  60   // Index pointer that will be moving through Idx until the first parent
  61   // namespace of Info (where the reference has to be inserted) is found.
  62   Index *I = &Idx;
  63   // The Namespace vector includes the upper-most namespace at the end so the
  64   // loop will start from the end to find each of the namespaces.
  65   for (const auto &R : llvm::reverse(Info->Namespace)) {
  66     // Look for the current namespace in the children of the index I is
  67     // pointing.
  68     auto It = llvm::find(I->Children, R.USR);
  69     if (It != I->Children.end()) {
  70       // If it is found, just change I to point the namespace reference found.
  71       I = &*It;
  72     } else {
  73       // If it is not found a new reference is created
  74       I->Children.emplace_back(R.USR, R.Name, R.RefType, R.Path);
  75       // I is updated with the reference of the new namespace reference
  76       I = &I->Children.back();
  77     }
  78   }
  79   // Look for Info in the vector where it is supposed to be; it could already
  80   // exist if it is a parent namespace of an Info already passed to this
  81   // function.
  82   auto It = llvm::find(I->Children, Info->USR);
  83   if (It == I->Children.end()) {
  84     // If it is not in the vector it is inserted
  85     I->Children.emplace_back(Info->USR, Info->extractName(), Info->IT,
  86                              Info->Path);
  87   } else {
  88     // If it not in the vector we only check if Path and Name are not empty
  89     // because if the Info was included by a namespace it may not have those
  90     // values.
  91     if (It->Path.empty())
  92       It->Path = Info->Path;
  93     if (It->Name.empty())
  94       It->Name = Info->extractName();
  95   }
  96 }
  97
  98 // This anchor is used to force the linker to link in the generated object file
  99 // and thus register the generators.
 100 extern volatile int YAMLGeneratorAnchorSource;
 101 extern volatile int MDGeneratorAnchorSource;
 102 extern volatile int HTMLGeneratorAnchorSource;
 103 static int LLVM_ATTRIBUTE_UNUSED YAMLGeneratorAnchorDest =
 104     YAMLGeneratorAnchorSource;
 105 static int LLVM_ATTRIBUTE_UNUSED MDGeneratorAnchorDest =
 106     MDGeneratorAnchorSource;
 107 static int LLVM_ATTRIBUTE_UNUSED HTMLGeneratorAnchorDest =
 108     HTMLGeneratorAnchorSource;
 109
 110 } // namespace doc
 111 } // namespace clang