HTMLPrint.cpp source code [clang_source_code/lib/Frontend/Rewrite/HTMLPrint.cpp]

1	//===--- HTMLPrint.cpp - Source code -> HTML pretty-printing --------------===//
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	// Pretty-printing of source code to HTML.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "clang/AST/ASTConsumer.h"
14	#include "clang/AST/ASTContext.h"
15	#include "clang/AST/Decl.h"
16	#include "clang/Basic/Diagnostic.h"
17	#include "clang/Basic/FileManager.h"
18	#include "clang/Basic/SourceManager.h"
19	#include "clang/Lex/Preprocessor.h"
20	#include "clang/Rewrite/Core/HTMLRewrite.h"
21	#include "clang/Rewrite/Core/Rewriter.h"
22	#include "clang/Rewrite/Frontend/ASTConsumers.h"
23	#include "llvm/Support/raw_ostream.h"
24	using namespace clang;
25
26	//===----------------------------------------------------------------------===//
27	// Functional HTML pretty-printing.
28	//===----------------------------------------------------------------------===//
29
30	namespace {
31	class HTMLPrinter : public ASTConsumer {
32	Rewriter R;
33	std::unique_ptr<raw_ostream> Out;
34	Preprocessor &PP;
35	bool SyntaxHighlight, HighlightMacros;
36
37	public:
38	HTMLPrinter(std::unique_ptr<raw_ostream> OS, Preprocessor &pp,
39	bool _SyntaxHighlight, bool _HighlightMacros)
40	: Out(std::move(OS)), PP(pp), SyntaxHighlight(_SyntaxHighlight),
41	HighlightMacros(_HighlightMacros) {}
42
43	void Initialize(ASTContext &context) override;
44	void HandleTranslationUnit(ASTContext &Ctx) override;
45	};
46	}
47
48	std::unique_ptr<ASTConsumer>
49	clang::CreateHTMLPrinter(std::unique_ptr<raw_ostream> OS, Preprocessor &PP,
50	bool SyntaxHighlight, bool HighlightMacros) {
51	return llvm::make_unique<HTMLPrinter>(std::move(OS), PP, SyntaxHighlight,
52	HighlightMacros);
53	}
54
55	void HTMLPrinter::Initialize(ASTContext &context) {
56	R.setSourceMgr(context.getSourceManager(), context.getLangOpts());
57	}
58
59	void HTMLPrinter::HandleTranslationUnit(ASTContext &Ctx) {
60	if (PP.getDiagnostics().hasErrorOccurred())
61	return;
62
63	// Format the file.
64	FileID FID = R.getSourceMgr().getMainFileID();
65	const FileEntry* Entry = R.getSourceMgr().getFileEntryForID(FID);
66	StringRef Name;
67	// In some cases, in particular the case where the input is from stdin,
68	// there is no entry. Fall back to the memory buffer for a name in those
69	// cases.
70	if (Entry)
71	Name = Entry->getName();
72	else
73	Name = R.getSourceMgr().getBuffer(FID)->getBufferIdentifier();
74
75	html::AddLineNumbers(R, FID);
76	html::AddHeaderFooterInternalBuiltinCSS(R, FID, Name);
77
78	// If we have a preprocessor, relex the file and syntax highlight.
79	// We might not have a preprocessor if we come from a deserialized AST file,
80	// for example.
81
82	if (SyntaxHighlight) html::SyntaxHighlight(R, FID, PP);
83	if (HighlightMacros) html::HighlightMacros(R, FID, PP);
84	html::EscapeText(R, FID, false, true);
85
86	// Emit the HTML.
87	const RewriteBuffer &RewriteBuf = R.getEditBuffer(FID);
88	std::unique_ptr<char[]> Buffer(new char[RewriteBuf.size()]);
89	std::copy(RewriteBuf.begin(), RewriteBuf.end(), Buffer.get());
90	Out->write(Buffer.get(), RewriteBuf.size());
91	}
92

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