82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
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//===--- ClangCommentHTMLNamedCharacterReferenceEmitter.cpp -----------------=//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend emits an efficient function to translate HTML named
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// character references to UTF-8 sequences.
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//
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//===----------------------------------------------------------------------===//
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#include "TableGenBackends.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/ConvertUTF.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/Record.h"
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#include "llvm/TableGen/StringMatcher.h"
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#include "llvm/TableGen/TableGenBackend.h"
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#include <vector>
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using namespace llvm;
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/// Convert a code point to the corresponding UTF-8 sequence represented
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/// as a C string literal.
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///
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/// \returns true on success.
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static bool translateCodePointToUTF8(unsigned CodePoint,
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SmallVectorImpl<char> &CLiteral) {
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char Translated[UNI_MAX_UTF8_BYTES_PER_CODE_POINT];
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char *TranslatedPtr = Translated;
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if (!ConvertCodePointToUTF8(CodePoint, TranslatedPtr))
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return false;
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StringRef UTF8(Translated, TranslatedPtr - Translated);
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raw_svector_ostream OS(CLiteral);
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OS << "\"";
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for (size_t i = 0, e = UTF8.size(); i != e; ++i) {
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OS << "\\x";
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OS.write_hex(static_cast<unsigned char>(UTF8[i]));
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}
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OS << "\"";
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return true;
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}
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void clang::EmitClangCommentHTMLNamedCharacterReferences(RecordKeeper &Records,
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raw_ostream &OS) {
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std::vector<Record *> Tags = Records.getAllDerivedDefinitions("NCR");
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std::vector<StringMatcher::StringPair> NameToUTF8;
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SmallString<32> CLiteral;
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for (std::vector<Record *>::iterator I = Tags.begin(), E = Tags.end();
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I != E; ++I) {
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Record &Tag = **I;
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std::string Spelling = std::string(Tag.getValueAsString("Spelling"));
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uint64_t CodePoint = Tag.getValueAsInt("CodePoint");
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CLiteral.clear();
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CLiteral.append("return ");
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if (!translateCodePointToUTF8(CodePoint, CLiteral)) {
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SrcMgr.PrintMessage(Tag.getLoc().front(),
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SourceMgr::DK_Error,
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Twine("invalid code point"));
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continue;
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}
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CLiteral.append(";");
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StringMatcher::StringPair Match(Spelling, std::string(CLiteral.str()));
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NameToUTF8.push_back(Match);
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}
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emitSourceFileHeader("HTML named character reference to UTF-8 "
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"translation", OS);
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OS << "StringRef translateHTMLNamedCharacterReferenceToUTF8(\n"
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" StringRef Name) {\n";
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StringMatcher("Name", NameToUTF8, OS).Emit();
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OS << " return StringRef();\n"
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<< "}\n\n";
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}
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