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//===-- HTMLGenerator.cpp - HTML Generator ----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Generators.h"
#include "Representation.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include <string>
using namespace llvm;
namespace clang {
namespace doc {
namespace {
class HTMLTag {
public:
// Any other tag can be added if required
enum TagType {
TAG_META,
TAG_TITLE,
TAG_DIV,
TAG_H1,
TAG_H2,
TAG_H3,
TAG_P,
TAG_UL,
TAG_LI,
TAG_A,
};
HTMLTag() = default;
constexpr HTMLTag(TagType Value) : Value(Value) {}
operator TagType() const { return Value; }
operator bool() = delete;
bool IsSelfClosing() const;
bool HasInlineChildren() const;
llvm::SmallString<16> ToString() const;
private:
TagType Value;
};
enum NodeType {
NODE_TEXT,
NODE_TAG,
};
struct HTMLNode {
HTMLNode(NodeType Type) : Type(Type) {}
virtual ~HTMLNode() = default;
virtual void Render(llvm::raw_ostream &OS, int IndentationLevel) = 0;
NodeType Type; // Type of node
};
struct TextNode : public HTMLNode {
TextNode(const Twine &Text, bool Indented = true)
: HTMLNode(NodeType::NODE_TEXT), Text(Text.str()), Indented(Indented) {}
std::string Text; // Content of node
bool Indented; // Indicates if an indentation must be rendered before the text
void Render(llvm::raw_ostream &OS, int IndentationLevel) override;
};
struct TagNode : public HTMLNode {
TagNode(HTMLTag Tag)
: HTMLNode(NodeType::NODE_TAG), Tag(Tag),
InlineChildren(Tag.HasInlineChildren()),
SelfClosing(Tag.IsSelfClosing()) {}
TagNode(HTMLTag Tag, const Twine &Text) : TagNode(Tag) {
Children.emplace_back(
llvm::make_unique<TextNode>(Text.str(), !InlineChildren));
}
HTMLTag Tag; // Name of HTML Tag (p, div, h1)
bool InlineChildren; // Indicates if children nodes are rendered in the same
// line as itself or if children must rendered in the
// next line and with additional indentation
bool SelfClosing; // Indicates if tag is self-closing
std::vector<std::unique_ptr<HTMLNode>> Children; // List of child nodes
llvm::StringMap<llvm::SmallString<16>>
Attributes; // List of key-value attributes for tag
void Render(llvm::raw_ostream &OS, int IndentationLevel) override;
};
constexpr const char *kDoctypeDecl = "<!DOCTYPE html>";
struct HTMLFile {
std::vector<std::unique_ptr<HTMLNode>> Children; // List of child nodes
void Render(llvm::raw_ostream &OS) {
OS << kDoctypeDecl << "\n";
for (const auto &C : Children) {
C->Render(OS, 0);
OS << "\n";
}
}
};
} // namespace
bool HTMLTag::IsSelfClosing() const {
switch (Value) {
case HTMLTag::TAG_META:
return true;
case HTMLTag::TAG_TITLE:
case HTMLTag::TAG_DIV:
case HTMLTag::TAG_H1:
case HTMLTag::TAG_H2:
case HTMLTag::TAG_H3:
case HTMLTag::TAG_P:
case HTMLTag::TAG_UL:
case HTMLTag::TAG_LI:
case HTMLTag::TAG_A:
return false;
}
llvm_unreachable("Unhandled HTMLTag::TagType");
}
bool HTMLTag::HasInlineChildren() const {
switch (Value) {
case HTMLTag::TAG_META:
case HTMLTag::TAG_TITLE:
case HTMLTag::TAG_H1:
case HTMLTag::TAG_H2:
case HTMLTag::TAG_H3:
case HTMLTag::TAG_LI:
case HTMLTag::TAG_A:
return true;
case HTMLTag::TAG_DIV:
case HTMLTag::TAG_P:
case HTMLTag::TAG_UL:
return false;
}
llvm_unreachable("Unhandled HTMLTag::TagType");
}
llvm::SmallString<16> HTMLTag::ToString() const {
switch (Value) {
case HTMLTag::TAG_META:
return llvm::SmallString<16>("meta");
case HTMLTag::TAG_TITLE:
return llvm::SmallString<16>("title");
case HTMLTag::TAG_DIV:
return llvm::SmallString<16>("div");
case HTMLTag::TAG_H1:
return llvm::SmallString<16>("h1");
case HTMLTag::TAG_H2:
return llvm::SmallString<16>("h2");
case HTMLTag::TAG_H3:
return llvm::SmallString<16>("h3");
case HTMLTag::TAG_P:
return llvm::SmallString<16>("p");
case HTMLTag::TAG_UL:
return llvm::SmallString<16>("ul");
case HTMLTag::TAG_LI:
return llvm::SmallString<16>("li");
case HTMLTag::TAG_A:
return llvm::SmallString<16>("a");
}
llvm_unreachable("Unhandled HTMLTag::TagType");
}
void TextNode::Render(llvm::raw_ostream &OS, int IndentationLevel) {
if (Indented)
OS.indent(IndentationLevel * 2);
OS << Text;
}
void TagNode::Render(llvm::raw_ostream &OS, int IndentationLevel) {
OS.indent(IndentationLevel * 2);
OS << "<" << Tag.ToString();
for (const auto &A : Attributes)
OS << " " << A.getKey() << "=\"" << A.getValue() << "\"";
if (SelfClosing) {
OS << "/>";
return;
}
OS << ">";
if (!InlineChildren)
OS << "\n";
bool NewLineRendered = true;
for (const auto &C : Children) {
int ChildrenIndentation =
InlineChildren || !NewLineRendered ? 0 : IndentationLevel + 1;
C->Render(OS, ChildrenIndentation);
if (!InlineChildren && (C == Children.back() ||
(C->Type != NodeType::NODE_TEXT ||
(&C + 1)->get()->Type != NodeType::NODE_TEXT))) {
OS << "\n";
NewLineRendered = true;
} else
NewLineRendered = false;
}
if (!InlineChildren)
OS.indent(IndentationLevel * 2);
OS << "</" << Tag.ToString() << ">";
}
template <typename Derived, typename Base,
typename = std::enable_if<std::is_base_of<Derived, Base>::value>>
static void AppendVector(std::vector<Derived> &&New,
std::vector<Base> &Original) {
std::move(New.begin(), New.end(), std::back_inserter(Original));
}
// Compute the relative path that names the file path relative to the given
// directory.
static SmallString<128> computeRelativePath(StringRef FilePath,
StringRef Directory) {
StringRef Path = FilePath;
while (!Path.empty()) {
if (Directory == Path)
return FilePath.substr(Path.size());
Path = llvm::sys::path::parent_path(Path);
}
StringRef Dir = Directory;
SmallString<128> Result;
while (!Dir.empty()) {
if (Dir == FilePath)
break;
Dir = llvm::sys::path::parent_path(Dir);
llvm::sys::path::append(Result, "..");
}
llvm::sys::path::append(Result, FilePath.substr(Dir.size()));
return Result;
}
// HTML generation
static std::unique_ptr<TagNode> genLink(const Twine &Text, const Twine &Link) {
auto LinkNode = llvm::make_unique<TagNode>(HTMLTag::TAG_A, Text);
LinkNode->Attributes.try_emplace("href", Link.str());
return LinkNode;
}
static std::unique_ptr<HTMLNode> genTypeReference(const Reference &Type,
StringRef CurrentDirectory) {
if (Type.Path.empty())
return llvm::make_unique<TextNode>(Type.Name);
llvm::SmallString<128> Path =
computeRelativePath(Type.Path, CurrentDirectory);
llvm::sys::path::append(Path, Type.Name + ".html");
return genLink(Type.Name, Path);
}
static std::vector<std::unique_ptr<HTMLNode>>
genReferenceList(const llvm::SmallVectorImpl<Reference> &Refs,
const StringRef &CurrentDirectory) {
std::vector<std::unique_ptr<HTMLNode>> Out;
for (const auto &R : Refs) {
if (&R != Refs.begin())
Out.emplace_back(llvm::make_unique<TextNode>(", "));
Out.emplace_back(genTypeReference(R, CurrentDirectory));
}
return Out;
}
static std::vector<std::unique_ptr<TagNode>> genHTML(const EnumInfo &I);
static std::vector<std::unique_ptr<TagNode>> genHTML(const FunctionInfo &I,
StringRef ParentInfoDir);
static std::vector<std::unique_ptr<TagNode>>
genEnumsBlock(const std::vector<EnumInfo> &Enums) {
if (Enums.empty())
return {};
std::vector<std::unique_ptr<TagNode>> Out;
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H2, "Enums"));
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_DIV));
auto &DivBody = Out.back();
for (const auto &E : Enums) {
std::vector<std::unique_ptr<TagNode>> Nodes = genHTML(E);
AppendVector(std::move(Nodes), DivBody->Children);
}
return Out;
}
static std::unique_ptr<TagNode>
genEnumMembersBlock(const llvm::SmallVector<SmallString<16>, 4> &Members) {
if (Members.empty())
return nullptr;
auto List = llvm::make_unique<TagNode>(HTMLTag::TAG_UL);
for (const auto &M : Members)
List->Children.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_LI, M));
return List;
}
static std::vector<std::unique_ptr<TagNode>>
genFunctionsBlock(const std::vector<FunctionInfo> &Functions,
StringRef ParentInfoDir) {
if (Functions.empty())
return {};
std::vector<std::unique_ptr<TagNode>> Out;
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H2, "Functions"));
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_DIV));
auto &DivBody = Out.back();
for (const auto &F : Functions) {
std::vector<std::unique_ptr<TagNode>> Nodes = genHTML(F, ParentInfoDir);
AppendVector(std::move(Nodes), DivBody->Children);
}
return Out;
}
static std::vector<std::unique_ptr<TagNode>>
genRecordMembersBlock(const llvm::SmallVector<MemberTypeInfo, 4> &Members,
StringRef ParentInfoDir) {
if (Members.empty())
return {};
std::vector<std::unique_ptr<TagNode>> Out;
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H2, "Members"));
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_UL));
auto &ULBody = Out.back();
for (const auto &M : Members) {
std::string Access = getAccess(M.Access);
if (Access != "")
Access = Access + " ";
auto LIBody = llvm::make_unique<TagNode>(HTMLTag::TAG_LI);
LIBody->Children.emplace_back(llvm::make_unique<TextNode>(Access));
LIBody->Children.emplace_back(genTypeReference(M.Type, ParentInfoDir));
LIBody->Children.emplace_back(llvm::make_unique<TextNode>(" " + M.Name));
ULBody->Children.emplace_back(std::move(LIBody));
}
return Out;
}
static std::vector<std::unique_ptr<TagNode>>
genReferencesBlock(const std::vector<Reference> &References,
llvm::StringRef Title) {
if (References.empty())
return {};
std::vector<std::unique_ptr<TagNode>> Out;
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H2, Title));
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_UL));
auto &ULBody = Out.back();
for (const auto &R : References)
ULBody->Children.emplace_back(
llvm::make_unique<TagNode>(HTMLTag::TAG_LI, R.Name));
return Out;
}
static std::unique_ptr<TagNode> writeFileDefinition(const Location &L) {
return llvm::make_unique<TagNode>(
HTMLTag::TAG_P,
"Defined at line " + std::to_string(L.LineNumber) + " of " + L.Filename);
}
static std::unique_ptr<HTMLNode> genHTML(const CommentInfo &I) {
if (I.Kind == "FullComment") {
auto FullComment = llvm::make_unique<TagNode>(HTMLTag::TAG_DIV);
for (const auto &Child : I.Children) {
std::unique_ptr<HTMLNode> Node = genHTML(*Child);
if (Node)
FullComment->Children.emplace_back(std::move(Node));
}
return std::move(FullComment);
} else if (I.Kind == "ParagraphComment") {
auto ParagraphComment = llvm::make_unique<TagNode>(HTMLTag::TAG_P);
for (const auto &Child : I.Children) {
std::unique_ptr<HTMLNode> Node = genHTML(*Child);
if (Node)
ParagraphComment->Children.emplace_back(std::move(Node));
}
if (ParagraphComment->Children.empty())
return nullptr;
return std::move(ParagraphComment);
} else if (I.Kind == "TextComment") {
if (I.Text == "")
return nullptr;
return llvm::make_unique<TextNode>(I.Text, true);
}
return nullptr;
}
static std::unique_ptr<TagNode> genHTML(const std::vector<CommentInfo> &C) {
auto CommentBlock = llvm::make_unique<TagNode>(HTMLTag::TAG_DIV);
for (const auto &Child : C) {
if (std::unique_ptr<HTMLNode> Node = genHTML(Child))
CommentBlock->Children.emplace_back(std::move(Node));
}
return CommentBlock;
}
static std::vector<std::unique_ptr<TagNode>> genHTML(const EnumInfo &I) {
std::vector<std::unique_ptr<TagNode>> Out;
std::string EnumType;
if (I.Scoped)
EnumType = "enum class ";
else
EnumType = "enum ";
Out.emplace_back(
llvm::make_unique<TagNode>(HTMLTag::TAG_H3, EnumType + I.Name));
std::unique_ptr<TagNode> Node = genEnumMembersBlock(I.Members);
if (Node)
Out.emplace_back(std::move(Node));
if (I.DefLoc)
Out.emplace_back(writeFileDefinition(I.DefLoc.getValue()));
std::string Description;
if (!I.Description.empty())
Out.emplace_back(genHTML(I.Description));
return Out;
}
static std::vector<std::unique_ptr<TagNode>> genHTML(const FunctionInfo &I,
StringRef ParentInfoDir) {
std::vector<std::unique_ptr<TagNode>> Out;
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H3, I.Name));
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_P));
auto &FunctionHeader = Out.back();
std::string Access = getAccess(I.Access);
if (Access != "")
FunctionHeader->Children.emplace_back(
llvm::make_unique<TextNode>(Access + " "));
if (I.ReturnType.Type.Name != "") {
FunctionHeader->Children.emplace_back(
genTypeReference(I.ReturnType.Type, ParentInfoDir));
FunctionHeader->Children.emplace_back(llvm::make_unique<TextNode>(" "));
}
FunctionHeader->Children.emplace_back(
llvm::make_unique<TextNode>(I.Name + "("));
for (const auto &P : I.Params) {
if (&P != I.Params.begin())
FunctionHeader->Children.emplace_back(llvm::make_unique<TextNode>(", "));
FunctionHeader->Children.emplace_back(
genTypeReference(P.Type, ParentInfoDir));
FunctionHeader->Children.emplace_back(
llvm::make_unique<TextNode>(" " + P.Name));
}
FunctionHeader->Children.emplace_back(llvm::make_unique<TextNode>(")"));
if (I.DefLoc)
Out.emplace_back(writeFileDefinition(I.DefLoc.getValue()));
std::string Description;
if (!I.Description.empty())
Out.emplace_back(genHTML(I.Description));
return Out;
}
static std::vector<std::unique_ptr<TagNode>> genHTML(const NamespaceInfo &I,
std::string &InfoTitle) {
std::vector<std::unique_ptr<TagNode>> Out;
if (I.Name.str() == "")
InfoTitle = "Global Namespace";
else
InfoTitle = ("namespace " + I.Name).str();
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H1, InfoTitle));
std::string Description;
if (!I.Description.empty())
Out.emplace_back(genHTML(I.Description));
std::vector<std::unique_ptr<TagNode>> ChildNamespaces =
genReferencesBlock(I.ChildNamespaces, "Namespaces");
AppendVector(std::move(ChildNamespaces), Out);
std::vector<std::unique_ptr<TagNode>> ChildRecords =
genReferencesBlock(I.ChildRecords, "Records");
AppendVector(std::move(ChildRecords), Out);
std::vector<std::unique_ptr<TagNode>> ChildFunctions =
genFunctionsBlock(I.ChildFunctions, I.Path);
AppendVector(std::move(ChildFunctions), Out);
std::vector<std::unique_ptr<TagNode>> ChildEnums =
genEnumsBlock(I.ChildEnums);
AppendVector(std::move(ChildEnums), Out);
return Out;
}
static std::vector<std::unique_ptr<TagNode>> genHTML(const RecordInfo &I,
std::string &InfoTitle) {
std::vector<std::unique_ptr<TagNode>> Out;
InfoTitle = (getTagType(I.TagType) + " " + I.Name).str();
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_H1, InfoTitle));
if (I.DefLoc)
Out.emplace_back(writeFileDefinition(I.DefLoc.getValue()));
std::string Description;
if (!I.Description.empty())
Out.emplace_back(genHTML(I.Description));
std::vector<std::unique_ptr<HTMLNode>> Parents =
genReferenceList(I.Parents, I.Path);
std::vector<std::unique_ptr<HTMLNode>> VParents =
genReferenceList(I.VirtualParents, I.Path);
if (!Parents.empty() || !VParents.empty()) {
Out.emplace_back(llvm::make_unique<TagNode>(HTMLTag::TAG_P));
auto &PBody = Out.back();
PBody->Children.emplace_back(llvm::make_unique<TextNode>("Inherits from "));
if (Parents.empty())
AppendVector(std::move(VParents), PBody->Children);
else if (VParents.empty())
AppendVector(std::move(Parents), PBody->Children);
else {
AppendVector(std::move(Parents), PBody->Children);
PBody->Children.emplace_back(llvm::make_unique<TextNode>(", "));
AppendVector(std::move(VParents), PBody->Children);
}
}
std::vector<std::unique_ptr<TagNode>> Members =
genRecordMembersBlock(I.Members, I.Path);
AppendVector(std::move(Members), Out);
std::vector<std::unique_ptr<TagNode>> ChildRecords =
genReferencesBlock(I.ChildRecords, "Records");
AppendVector(std::move(ChildRecords), Out);
std::vector<std::unique_ptr<TagNode>> ChildFunctions =
genFunctionsBlock(I.ChildFunctions, I.Path);
AppendVector(std::move(ChildFunctions), Out);
std::vector<std::unique_ptr<TagNode>> ChildEnums =
genEnumsBlock(I.ChildEnums);
AppendVector(std::move(ChildEnums), Out);
return Out;
}
/// Generator for HTML documentation.
class HTMLGenerator : public Generator {
public:
static const char *Format;
llvm::Error generateDocForInfo(Info *I, llvm::raw_ostream &OS) override;
};
const char *HTMLGenerator::Format = "html";
llvm::Error HTMLGenerator::generateDocForInfo(Info *I, llvm::raw_ostream &OS) {
HTMLFile F;
auto MetaNode = llvm::make_unique<TagNode>(HTMLTag::TAG_META);
MetaNode->Attributes.try_emplace("charset", "utf-8");
F.Children.emplace_back(std::move(MetaNode));
std::string InfoTitle;
Info CastedInfo;
auto MainContentNode = llvm::make_unique<TagNode>(HTMLTag::TAG_DIV);
switch (I->IT) {
case InfoType::IT_namespace: {
std::vector<std::unique_ptr<TagNode>> Nodes =
genHTML(*static_cast<clang::doc::NamespaceInfo *>(I), InfoTitle);
AppendVector(std::move(Nodes), MainContentNode->Children);
break;
}
case InfoType::IT_record: {
std::vector<std::unique_ptr<TagNode>> Nodes =
genHTML(*static_cast<clang::doc::RecordInfo *>(I), InfoTitle);
AppendVector(std::move(Nodes), MainContentNode->Children);
break;
}
case InfoType::IT_enum: {
std::vector<std::unique_ptr<TagNode>> Nodes =
genHTML(*static_cast<clang::doc::EnumInfo *>(I));
AppendVector(std::move(Nodes), MainContentNode->Children);
break;
}
case InfoType::IT_function: {
std::vector<std::unique_ptr<TagNode>> Nodes =
genHTML(*static_cast<clang::doc::FunctionInfo *>(I), "");
AppendVector(std::move(Nodes), MainContentNode->Children);
break;
}
case InfoType::IT_default:
return llvm::make_error<llvm::StringError>("Unexpected info type.\n",
llvm::inconvertibleErrorCode());
}
F.Children.emplace_back(
llvm::make_unique<TagNode>(HTMLTag::TAG_TITLE, InfoTitle));
F.Children.emplace_back(std::move(MainContentNode));
F.Render(OS);
return llvm::Error::success();
}
static GeneratorRegistry::Add<HTMLGenerator> HTML(HTMLGenerator::Format,
"Generator for HTML output.");
// This anchor is used to force the linker to link in the generated object
// file and thus register the generator.
volatile int HTMLGeneratorAnchorSource = 0;
} // namespace doc
} // namespace clang
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