ClangCommentHTMLNamedCharacterReferenceEmitter.cpp source code [clang_source_code/utils/TableGen/ClangCommentHTMLNamedCharacterReferenceEmitter.cpp]

1	//===--- ClangCommentHTMLNamedCharacterReferenceEmitter.cpp -----------------=//
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	// This tablegen backend emits an efficient function to translate HTML named
10	// character references to UTF-8 sequences.
11	//
12	//===----------------------------------------------------------------------===//
13
14	#include "llvm/ADT/SmallString.h"
15	#include "llvm/Support/ConvertUTF.h"
16	#include "llvm/TableGen/Error.h"
17	#include "llvm/TableGen/Record.h"
18	#include "llvm/TableGen/StringMatcher.h"
19	#include "llvm/TableGen/TableGenBackend.h"
20	#include <vector>
21
22	using namespace llvm;
23
24	/// Convert a code point to the corresponding UTF-8 sequence represented
25	/// as a C string literal.
26	///
27	/// \returns true on success.
28	static bool translateCodePointToUTF8(unsigned CodePoint,
29	SmallVectorImpl<char> &CLiteral) {
30	char Translated[UNI_MAX_UTF8_BYTES_PER_CODE_POINT];
31	char *TranslatedPtr = Translated;
32	if (!ConvertCodePointToUTF8(CodePoint, TranslatedPtr))
33	return false;
34
35	StringRef UTF8(Translated, TranslatedPtr - Translated);
36
37	raw_svector_ostream OS(CLiteral);
38	OS << "\"";
39	for (size_t i = 0, e = UTF8.size(); i != e; ++i) {
40	OS << "\\x";
41	OS.write_hex(static_cast<unsigned char>(UTF8[i]));
42	}
43	OS << "\"";
44
45	return true;
46	}
47
48	namespace clang {
49	void EmitClangCommentHTMLNamedCharacterReferences(RecordKeeper &Records,
50	raw_ostream &OS) {
51	std::vector<Record *> Tags = Records.getAllDerivedDefinitions("NCR");
52	std::vector<StringMatcher::StringPair> NameToUTF8;
53	SmallString<32> CLiteral;
54	for (std::vector<Record *>::iterator I = Tags.begin(), E = Tags.end();
55	I != E; ++I) {
56	Record &Tag = **I;
57	std::string Spelling = Tag.getValueAsString("Spelling");
58	uint64_t CodePoint = Tag.getValueAsInt("CodePoint");
59	CLiteral.clear();
60	CLiteral.append("return ");
61	if (!translateCodePointToUTF8(CodePoint, CLiteral)) {
62	SrcMgr.PrintMessage(Tag.getLoc().front(),
63	SourceMgr::DK_Error,
64	Twine("invalid code point"));
65	continue;
66	}
67	CLiteral.append(";");
68
69	StringMatcher::StringPair Match(Spelling, CLiteral.str());
70	NameToUTF8.push_back(Match);
71	}
72
73	emitSourceFileHeader("HTML named character reference to UTF-8 "
74	"translation", OS);
75
76	OS << "StringRef translateHTMLNamedCharacterReferenceToUTF8(\n"
77	" StringRef Name) {\n";
78	StringMatcher("Name", NameToUTF8, OS).Emit();
79	OS << " return StringRef();\n"
80	<< "}\n\n";
81	}
82
83	} // end namespace clang
84
85

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