tools/llvm-cov/SourceCoverageViewHTML.cpp - external/github.com/emscripten-core/emscripten-fastcomp - Git at Google

 //===- SourceCoverageViewHTML.cpp - A html code coverage view -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file This file implements the html coverage renderer.
 ///
 //===----------------------------------------------------------------------===//

 #include "CoverageReport.h"
 #include "SourceCoverageViewHTML.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/Path.h"

 using namespace llvm;

 namespace {

 // Return a string with the special characters in \p Str escaped.
 std::string escape(StringRef Str, const CoverageViewOptions &Opts) {
   std::string Result;
   unsigned ColNum = 0; // Record the column number.
   for (char C : Str) {
     ++ColNum;
     if (C == '&')
       Result += "&amp;";
     else if (C == '<')
       Result += "&lt;";
     else if (C == '>')
       Result += "&gt;";
     else if (C == '\"')
       Result += "&quot;";
     else if (C == '\n' || C == '\r') {
       Result += C;
       ColNum = 0;
     } else if (C == '\t') {
       // Replace '\t' with TabSize spaces.
       unsigned NumSpaces = Opts.TabSize - (--ColNum % Opts.TabSize);
       for (unsigned I = 0; I < NumSpaces; ++I)
         Result += "&nbsp;";
       ColNum += NumSpaces;
     } else
       Result += C;
   }
   return Result;
 }

 // Create a \p Name tag around \p Str, and optionally set its \p ClassName.
 std::string tag(const std::string &Name, const std::string &Str,
                 const std::string &ClassName = "") {
   std::string Tag = "<" + Name;
   if (ClassName != "")
     Tag += " class='" + ClassName + "'";
   return Tag + ">" + Str + "</" + Name + ">";
 }

 // Create an anchor to \p Link with the label \p Str.
 std::string a(const std::string &Link, const std::string &Str,
               const std::string &TargetName = "") {
   std::string Name = TargetName.empty() ? "" : ("name='" + TargetName + "' ");
   return "<a " + Name + "href='" + Link + "'>" + Str + "</a>";
 }

 const char *BeginHeader =
   "<head>"
     "<meta name='viewport' content='width=device-width,initial-scale=1'>"
     "<meta charset='UTF-8'>";

 const char *CSSForCoverage =
     R"(.red {
   background-color: #ffd0d0;
 }
 .cyan {
   background-color: cyan;
 }
 body {
   font-family: -apple-system, sans-serif;
 }
 pre {
   margin-top: 0px !important;
   margin-bottom: 0px !important;
 }
 .source-name-title {
   padding: 5px 10px;
   border-bottom: 1px solid #dbdbdb;
   background-color: #eee;
   line-height: 35px;
 }
 .centered {
   display: table;
   margin-left: left;
   margin-right: auto;
   border: 1px solid #dbdbdb;
   border-radius: 3px;
 }
 .expansion-view {
   background-color: rgba(0, 0, 0, 0);
   margin-left: 0px;
   margin-top: 5px;
   margin-right: 5px;
   margin-bottom: 5px;
   border: 1px solid #dbdbdb;
   border-radius: 3px;
 }
 table {
   border-collapse: collapse;
 }
 .light-row {
   background: #ffffff;
   border: 1px solid #dbdbdb;
 }
 .column-entry {
   text-align: right;
 }
 .column-entry-left {
   text-align: left;
 }
 .column-entry-yellow {
   text-align: right;
   background-color: #ffffd0;
 }
 .column-entry-red {
   text-align: right;
   background-color: #ffd0d0;
 }
 .column-entry-green {
   text-align: right;
   background-color: #d0ffd0;
 }
 .line-number {
   text-align: right;
   color: #aaa;
 }
 .covered-line {
   text-align: right;
   color: #0080ff;
 }
 .uncovered-line {
   text-align: right;
   color: #ff3300;
 }
 .tooltip {
   position: relative;
   display: inline;
   background-color: #b3e6ff;
   text-decoration: none;
 }
 .tooltip span.tooltip-content {
   position: absolute;
   width: 100px;
   margin-left: -50px;
   color: #FFFFFF;
   background: #000000;
   height: 30px;
   line-height: 30px;
   text-align: center;
   visibility: hidden;
   border-radius: 6px;
 }
 .tooltip span.tooltip-content:after {
   content: '';
   position: absolute;
   top: 100%;
   left: 50%;
   margin-left: -8px;
   width: 0; height: 0;
   border-top: 8px solid #000000;
   border-right: 8px solid transparent;
   border-left: 8px solid transparent;
 }
 :hover.tooltip span.tooltip-content {
   visibility: visible;
   opacity: 0.8;
   bottom: 30px;
   left: 50%;
   z-index: 999;
 }
 th, td {
   vertical-align: top;
   padding: 2px 5px;
   border-collapse: collapse;
   border-right: solid 1px #eee;
   border-left: solid 1px #eee;
 }
 td:first-child {
   border-left: none;
 }
 td:last-child {
   border-right: none;
 }
 )";

 const char *EndHeader = "</head>";

 const char *BeginCenteredDiv = "<div class='centered'>";

 const char *EndCenteredDiv = "</div>";

 const char *BeginSourceNameDiv = "<div class='source-name-title'>";

 const char *EndSourceNameDiv = "</div>";

 const char *BeginCodeTD = "<td class='code'>";

 const char *EndCodeTD = "</td>";

 const char *BeginPre = "<pre>";

 const char *EndPre = "</pre>";

 const char *BeginExpansionDiv = "<div class='expansion-view'>";

 const char *EndExpansionDiv = "</div>";

 const char *BeginTable = "<table>";

 const char *EndTable = "</table>";

 const char *ProjectTitleTag = "h1";

 const char *ReportTitleTag = "h2";

 const char *CreatedTimeTag = "h4";

 std::string getPathToStyle(StringRef ViewPath) {
   std::string PathToStyle = "";
   std::string PathSep = sys::path::get_separator();
   unsigned NumSeps = ViewPath.count(PathSep);
   for (unsigned I = 0, E = NumSeps; I < E; ++I)
     PathToStyle += ".." + PathSep;
   return PathToStyle + "style.css";
 }

 void emitPrelude(raw_ostream &OS, const CoverageViewOptions &Opts,
                  const std::string &PathToStyle = "") {
   OS << "<!doctype html>"
         "<html>"
      << BeginHeader;

   // Link to a stylesheet if one is available. Otherwise, use the default style.
   if (PathToStyle.empty())
     OS << "<style>" << CSSForCoverage << "</style>";
   else
     OS << "<link rel='stylesheet' type='text/css' href='"
        << escape(PathToStyle, Opts) << "'>";

   OS << EndHeader << "<body>";
 }

 void emitEpilog(raw_ostream &OS) {
   OS << "</body>"
      << "</html>";
 }

 } // anonymous namespace

 Expected<CoveragePrinter::OwnedStream>
 CoveragePrinterHTML::createViewFile(StringRef Path, bool InToplevel) {
   auto OSOrErr = createOutputStream(Path, "html", InToplevel);
   if (!OSOrErr)
     return OSOrErr;

   OwnedStream OS = std::move(OSOrErr.get());

   if (!Opts.hasOutputDirectory()) {
     emitPrelude(*OS.get(), Opts);
   } else {
     std::string ViewPath = getOutputPath(Path, "html", InToplevel);
     emitPrelude(*OS.get(), Opts, getPathToStyle(ViewPath));
   }

   return std::move(OS);
 }

 void CoveragePrinterHTML::closeViewFile(OwnedStream OS) {
   emitEpilog(*OS.get());
 }

 /// Emit column labels for the table in the index.
 static void emitColumnLabelsForIndex(raw_ostream &OS) {
   SmallVector<std::string, 4> Columns;
   Columns.emplace_back(tag("td", "Filename", "column-entry-left"));
   for (const char *Label : {"Function Coverage", "Instantiation Coverage",
                             "Line Coverage", "Region Coverage"})
     Columns.emplace_back(tag("td", Label, "column-entry"));
   OS << tag("tr", join(Columns.begin(), Columns.end(), ""));
 }

 /// Render a file coverage summary (\p FCS) in a table row. If \p IsTotals is
 /// false, link the summary to \p SF.
 void CoveragePrinterHTML::emitFileSummary(raw_ostream &OS, StringRef SF,
                                           const FileCoverageSummary &FCS,
                                           bool IsTotals) const {
   SmallVector<std::string, 8> Columns;

   // Format a coverage triple and add the result to the list of columns.
   auto AddCoverageTripleToColumn = [&Columns](unsigned Hit, unsigned Total,
                                               float Pctg) {
     std::string S;
     {
       raw_string_ostream RSO{S};
       if (Total)
         RSO << format("%*.2f", 7, Pctg) << "% ";
       else
         RSO << "- ";
       RSO << '(' << Hit << '/' << Total << ')';
     }
     const char *CellClass = "column-entry-yellow";
     if (Hit == Total)
       CellClass = "column-entry-green";
     else if (Pctg < 80.0)
       CellClass = "column-entry-red";
     Columns.emplace_back(tag("td", tag("pre", S), CellClass));
   };

   // Simplify the display file path, and wrap it in a link if requested.
   std::string Filename;
   if (IsTotals) {
     Filename = "TOTALS";
   } else {
     SmallString<128> LinkTextStr(sys::path::relative_path(FCS.Name));
     sys::path::remove_dots(LinkTextStr, /*remove_dot_dots=*/true);
     sys::path::native(LinkTextStr);
     std::string LinkText = escape(LinkTextStr, Opts);
     std::string LinkTarget =
         escape(getOutputPath(SF, "html", /*InToplevel=*/false), Opts);
     Filename = a(LinkTarget, LinkText);
   }

   Columns.emplace_back(tag("td", tag("pre", Filename)));
   AddCoverageTripleToColumn(FCS.FunctionCoverage.Executed,
                             FCS.FunctionCoverage.NumFunctions,
                             FCS.FunctionCoverage.getPercentCovered());
   AddCoverageTripleToColumn(FCS.InstantiationCoverage.Executed,
                             FCS.InstantiationCoverage.NumFunctions,
                             FCS.InstantiationCoverage.getPercentCovered());
   AddCoverageTripleToColumn(FCS.LineCoverage.Covered, FCS.LineCoverage.NumLines,
                             FCS.LineCoverage.getPercentCovered());
   AddCoverageTripleToColumn(FCS.RegionCoverage.Covered,
                             FCS.RegionCoverage.NumRegions,
                             FCS.RegionCoverage.getPercentCovered());

   OS << tag("tr", join(Columns.begin(), Columns.end(), ""), "light-row");
 }

 Error CoveragePrinterHTML::createIndexFile(
     ArrayRef<std::string> SourceFiles,
     const coverage::CoverageMapping &Coverage) {
   // Emit the default stylesheet.
   auto CSSOrErr = createOutputStream("style", "css", /*InToplevel=*/true);
   if (Error E = CSSOrErr.takeError())
     return E;

   OwnedStream CSS = std::move(CSSOrErr.get());
   CSS->operator<<(CSSForCoverage);

   // Emit a file index along with some coverage statistics.
   auto OSOrErr = createOutputStream("index", "html", /*InToplevel=*/true);
   if (Error E = OSOrErr.takeError())
     return E;
   auto OS = std::move(OSOrErr.get());
   raw_ostream &OSRef = *OS.get();

   assert(Opts.hasOutputDirectory() && "No output directory for index file");
   emitPrelude(OSRef, Opts, getPathToStyle(""));

   // Emit some basic information about the coverage report.
   if (Opts.hasProjectTitle())
     OSRef << tag(ProjectTitleTag, escape(Opts.ProjectTitle, Opts));
   OSRef << tag(ReportTitleTag, "Coverage Report");
   if (Opts.hasCreatedTime())
     OSRef << tag(CreatedTimeTag, escape(Opts.CreatedTimeStr, Opts));

   // Emit a link to some documentation.
   OSRef << tag("p", "Click " +
                         a("http://clang.llvm.org/docs/"
                           "SourceBasedCodeCoverage.html#interpreting-reports",
                           "here") +
                         " for information about interpreting this report.");

   // Emit a table containing links to reports for each file in the covmapping.
   OSRef << BeginCenteredDiv << BeginTable;
   emitColumnLabelsForIndex(OSRef);
   FileCoverageSummary Totals("TOTALS");
   auto FileReports =
       CoverageReport::prepareFileReports(Coverage, Totals, SourceFiles);
   for (unsigned I = 0, E = FileReports.size(); I < E; ++I)
     emitFileSummary(OSRef, SourceFiles[I], FileReports[I]);
   emitFileSummary(OSRef, "Totals", Totals, /*IsTotals=*/true);
   OSRef << EndTable << EndCenteredDiv
         << tag("h5", escape(Opts.getLLVMVersionString(), Opts));
   emitEpilog(OSRef);

   return Error::success();
 }

 void SourceCoverageViewHTML::renderViewHeader(raw_ostream &OS) {
   OS << BeginCenteredDiv << BeginTable;
 }

 void SourceCoverageViewHTML::renderViewFooter(raw_ostream &OS) {
   OS << EndTable << EndCenteredDiv;
 }

 void SourceCoverageViewHTML::renderSourceName(raw_ostream &OS, bool WholeFile) {
   OS << BeginSourceNameDiv << tag("pre", escape(getSourceName(), getOptions()))
      << EndSourceNameDiv;
 }

 void SourceCoverageViewHTML::renderLinePrefix(raw_ostream &OS, unsigned) {
   OS << "<tr>";
 }

 void SourceCoverageViewHTML::renderLineSuffix(raw_ostream &OS, unsigned) {
   // If this view has sub-views, renderLine() cannot close the view's cell.
   // Take care of it here, after all sub-views have been rendered.
   if (hasSubViews())
     OS << EndCodeTD;
   OS << "</tr>";
 }

 void SourceCoverageViewHTML::renderViewDivider(raw_ostream &, unsigned) {
   // The table-based output makes view dividers unnecessary.
 }

 void SourceCoverageViewHTML::renderLine(
     raw_ostream &OS, LineRef L, const coverage::CoverageSegment *WrappedSegment,
     CoverageSegmentArray Segments, unsigned ExpansionCol, unsigned) {
   StringRef Line = L.Line;
   unsigned LineNo = L.LineNo;

   // Steps for handling text-escaping, highlighting, and tooltip creation:
   //
   // 1. Split the line into N+1 snippets, where N = |Segments|. The first
   //    snippet starts from Col=1 and ends at the start of the first segment.
   //    The last snippet starts at the last mapped column in the line and ends
   //    at the end of the line. Both are required but may be empty.

   SmallVector<std::string, 8> Snippets;

   unsigned LCol = 1;
   auto Snip = [&](unsigned Start, unsigned Len) {
     Snippets.push_back(Line.substr(Start, Len));
     LCol += Len;
   };

   Snip(LCol - 1, Segments.empty() ? 0 : (Segments.front()->Col - 1));

   for (unsigned I = 1, E = Segments.size(); I < E; ++I)
     Snip(LCol - 1, Segments[I]->Col - LCol);

   // |Line| + 1 is needed to avoid underflow when, e.g |Line| = 0 and LCol = 1.
   Snip(LCol - 1, Line.size() + 1 - LCol);

   // 2. Escape all of the snippets.

   for (unsigned I = 0, E = Snippets.size(); I < E; ++I)
     Snippets[I] = escape(Snippets[I], getOptions());

   // 3. Use \p WrappedSegment to set the highlight for snippet 0. Use segment
   //    1 to set the highlight for snippet 2, segment 2 to set the highlight for
   //    snippet 3, and so on.

   Optional<std::string> Color;
   SmallVector<std::pair<unsigned, unsigned>, 2> HighlightedRanges;
   auto Highlight = [&](const std::string &Snippet, unsigned LC, unsigned RC) {
     if (getOptions().Debug)
       HighlightedRanges.emplace_back(LC, RC);
     return tag("span", Snippet, Color.getValue());
   };

   auto CheckIfUncovered = [](const coverage::CoverageSegment *S) {
     return S && S->HasCount && S->Count == 0;
   };

   if (CheckIfUncovered(WrappedSegment)) {
     Color = "red";
     if (!Snippets[0].empty())
       Snippets[0] = Highlight(Snippets[0], 1, 1 + Snippets[0].size());
   }

   for (unsigned I = 0, E = Segments.size(); I < E; ++I) {
     const auto *CurSeg = Segments[I];
     if (CurSeg->Col == ExpansionCol)
       Color = "cyan";
     else if (CheckIfUncovered(CurSeg))
       Color = "red";
     else
       Color = None;

     if (Color.hasValue())
       Snippets[I + 1] = Highlight(Snippets[I + 1], CurSeg->Col,
                                   CurSeg->Col + Snippets[I + 1].size());
   }

   if (Color.hasValue() && Segments.empty())
     Snippets.back() = Highlight(Snippets.back(), 1, 1 + Snippets.back().size());

   if (getOptions().Debug) {
     for (const auto &Range : HighlightedRanges) {
       errs() << "Highlighted line " << LineNo << ", " << Range.first << " -> ";
       if (Range.second == 0)
         errs() << "?";
       else
         errs() << Range.second;
       errs() << "\n";
     }
   }

   // 4. Snippets[1:N+1] correspond to \p Segments[0:N]: use these to generate
   //    sub-line region count tooltips if needed.

   bool HasMultipleRegions = [&] {
     unsigned RegionCount = 0;
     for (const auto *S : Segments)
       if (S->HasCount && S->IsRegionEntry)
         if (++RegionCount > 1)
           return true;
     return false;
   }();

   if (shouldRenderRegionMarkers(HasMultipleRegions)) {
     for (unsigned I = 0, E = Segments.size(); I < E; ++I) {
       const auto *CurSeg = Segments[I];
       if (!CurSeg->IsRegionEntry || !CurSeg->HasCount)
         continue;

       Snippets[I + 1] =
           tag("div", Snippets[I + 1] + tag("span", formatCount(CurSeg->Count),
                                            "tooltip-content"),
               "tooltip");
     }
   }

   OS << BeginCodeTD;
   OS << BeginPre;
   for (const auto &Snippet : Snippets)
     OS << Snippet;
   OS << EndPre;

   // If there are no sub-views left to attach to this cell, end the cell.
   // Otherwise, end it after the sub-views are rendered (renderLineSuffix()).
   if (!hasSubViews())
     OS << EndCodeTD;
 }

 void SourceCoverageViewHTML::renderLineCoverageColumn(
     raw_ostream &OS, const LineCoverageStats &Line) {
   std::string Count = "";
   if (Line.isMapped())
     Count = tag("pre", formatCount(Line.ExecutionCount));
   std::string CoverageClass =
       (Line.ExecutionCount > 0) ? "covered-line" : "uncovered-line";
   OS << tag("td", Count, CoverageClass);
 }

 void SourceCoverageViewHTML::renderLineNumberColumn(raw_ostream &OS,
                                                     unsigned LineNo) {
   std::string LineNoStr = utostr(uint64_t(LineNo));
   std::string TargetName = "L" + LineNoStr;
   OS << tag("td", a("#" + TargetName, tag("pre", LineNoStr), TargetName),
             "line-number");
 }

 void SourceCoverageViewHTML::renderRegionMarkers(raw_ostream &,
                                                  CoverageSegmentArray,
                                                  unsigned) {
   // Region markers are rendered in-line using tooltips.
 }

 void SourceCoverageViewHTML::renderExpansionSite(
     raw_ostream &OS, LineRef L, const coverage::CoverageSegment *WrappedSegment,
     CoverageSegmentArray Segments, unsigned ExpansionCol, unsigned ViewDepth) {
   // Render the line containing the expansion site. No extra formatting needed.
   renderLine(OS, L, WrappedSegment, Segments, ExpansionCol, ViewDepth);
 }

 void SourceCoverageViewHTML::renderExpansionView(raw_ostream &OS,
                                                  ExpansionView &ESV,
                                                  unsigned ViewDepth) {
   OS << BeginExpansionDiv;
   ESV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/false,
                   ViewDepth + 1);
   OS << EndExpansionDiv;
 }

 void SourceCoverageViewHTML::renderInstantiationView(raw_ostream &OS,
                                                      InstantiationView &ISV,
                                                      unsigned ViewDepth) {
   OS << BeginExpansionDiv;
   if (!ISV.View)
     OS << BeginSourceNameDiv
        << tag("pre",
               escape("Unexecuted instantiation: " + ISV.FunctionName.str(),
                      getOptions()))
        << EndSourceNameDiv;
   else
     ISV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/true,
                     ViewDepth);
   OS << EndExpansionDiv;
 }

 void SourceCoverageViewHTML::renderTitle(raw_ostream &OS, StringRef Title) {
   if (getOptions().hasProjectTitle())
     OS << tag(ProjectTitleTag, escape(getOptions().ProjectTitle, getOptions()));
   OS << tag(ReportTitleTag, escape(Title, getOptions()));
   if (getOptions().hasCreatedTime())
     OS << tag(CreatedTimeTag,
               escape(getOptions().CreatedTimeStr, getOptions()));
 }

 void SourceCoverageViewHTML::renderTableHeader(raw_ostream &OS,
                                                unsigned FirstUncoveredLineNo,
                                                unsigned ViewDepth) {
   std::string SourceLabel;
   if (FirstUncoveredLineNo == 0) {
     SourceLabel = tag("td", tag("pre", "Source"));
   } else {
     std::string LinkTarget = "#L" + utostr(uint64_t(FirstUncoveredLineNo));
     SourceLabel =
         tag("td", tag("pre", "Source (" +
                                  a(LinkTarget, "jump to first uncovered line") +
                                  ")"));
   }

   renderLinePrefix(OS, ViewDepth);
   OS << tag("td", tag("pre", "Line")) << tag("td", tag("pre", "Count"))
      << SourceLabel;
   renderLineSuffix(OS, ViewDepth);
 }
	//===- SourceCoverageViewHTML.cpp - A html code coverage view -------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	///
	/// \file This file implements the html coverage renderer.
	///
	//===----------------------------------------------------------------------===//

	#include "CoverageReport.h"
	#include "SourceCoverageViewHTML.h"
	#include "llvm/ADT/Optional.h"
	#include "llvm/ADT/SmallString.h"
	#include "llvm/ADT/StringExtras.h"
	#include "llvm/Support/FileSystem.h"
	#include "llvm/Support/Format.h"
	#include "llvm/Support/Path.h"

	using namespace llvm;

	namespace {

	// Return a string with the special characters in \p Str escaped.
	std::string escape(StringRef Str, const CoverageViewOptions &Opts) {
	std::string Result;
	unsigned ColNum = 0; // Record the column number.
	for (char C : Str) {
	++ColNum;
	if (C == '&')
	Result += "&";
	else if (C == '<')
	Result += "<";
	else if (C == '>')
	Result += ">";
	else if (C == '\"')
	Result += """;
	else if (C == '\n' \|\| C == '\r') {
	Result += C;
	ColNum = 0;
	} else if (C == '\t') {
	// Replace '\t' with TabSize spaces.
	unsigned NumSpaces = Opts.TabSize - (--ColNum % Opts.TabSize);
	for (unsigned I = 0; I < NumSpaces; ++I)
	Result += " ";
	ColNum += NumSpaces;
	} else
	Result += C;
	}
	return Result;
	}

	// Create a \p Name tag around \p Str, and optionally set its \p ClassName.
	std::string tag(const std::string &Name, const std::string &Str,
	const std::string &ClassName = "") {
	std::string Tag = "<" + Name;
	if (ClassName != "")
	Tag += " class='" + ClassName + "'";
	return Tag + ">" + Str + "</" + Name + ">";
	}

	// Create an anchor to \p Link with the label \p Str.
	std::string a(const std::string &Link, const std::string &Str,
	const std::string &TargetName = "") {
	std::string Name = TargetName.empty() ? "" : ("name='" + TargetName + "' ");
	return "<a " + Name + "href='" + Link + "'>" + Str + "</a>";
	}

	const char *BeginHeader =
	"<head>"
	"<meta name='viewport' content='width=device-width,initial-scale=1'>"
	"<meta charset='UTF-8'>";

	const char *CSSForCoverage =
	R"(.red {
	background-color: #ffd0d0;
	}
	.cyan {
	background-color: cyan;
	}
	body {
	font-family: -apple-system, sans-serif;
	}
	pre {
	margin-top: 0px !important;
	margin-bottom: 0px !important;
	}
	.source-name-title {
	padding: 5px 10px;
	border-bottom: 1px solid #dbdbdb;
	background-color: #eee;
	line-height: 35px;
	}
	.centered {
	display: table;
	margin-left: left;
	margin-right: auto;
	border: 1px solid #dbdbdb;
	border-radius: 3px;
	}
	.expansion-view {
	background-color: rgba(0, 0, 0, 0);
	margin-left: 0px;
	margin-top: 5px;
	margin-right: 5px;
	margin-bottom: 5px;
	border: 1px solid #dbdbdb;
	border-radius: 3px;
	}
	table {
	border-collapse: collapse;
	}
	.light-row {
	background: #ffffff;
	border: 1px solid #dbdbdb;
	}
	.column-entry {
	text-align: right;
	}
	.column-entry-left {
	text-align: left;
	}
	.column-entry-yellow {
	text-align: right;
	background-color: #ffffd0;
	}
	.column-entry-red {
	text-align: right;
	background-color: #ffd0d0;
	}
	.column-entry-green {
	text-align: right;
	background-color: #d0ffd0;
	}
	.line-number {
	text-align: right;
	color: #aaa;
	}
	.covered-line {
	text-align: right;
	color: #0080ff;
	}
	.uncovered-line {
	text-align: right;
	color: #ff3300;
	}
	.tooltip {
	position: relative;
	display: inline;
	background-color: #b3e6ff;
	text-decoration: none;
	}
	.tooltip span.tooltip-content {
	position: absolute;
	width: 100px;
	margin-left: -50px;
	color: #FFFFFF;
	background: #000000;
	height: 30px;
	line-height: 30px;
	text-align: center;
	visibility: hidden;
	border-radius: 6px;
	}
	.tooltip span.tooltip-content:after {
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	margin-left: -8px;
	width: 0; height: 0;
	border-top: 8px solid #000000;
	border-right: 8px solid transparent;
	border-left: 8px solid transparent;
	}
	:hover.tooltip span.tooltip-content {
	visibility: visible;
	opacity: 0.8;
	bottom: 30px;
	left: 50%;
	z-index: 999;
	}
	th, td {
	vertical-align: top;
	padding: 2px 5px;
	border-collapse: collapse;
	border-right: solid 1px #eee;
	border-left: solid 1px #eee;
	}
	td:first-child {
	border-left: none;
	}
	td:last-child {
	border-right: none;
	}
	)";

	const char *EndHeader = "</head>";

	const char *BeginCenteredDiv = "<div class='centered'>";

	const char *EndCenteredDiv = "</div>";

	const char *BeginSourceNameDiv = "<div class='source-name-title'>";

	const char *EndSourceNameDiv = "</div>";

	const char *BeginCodeTD = "<td class='code'>";

	const char *EndCodeTD = "</td>";

	const char *BeginPre = "<pre>";

	const char *EndPre = "</pre>";

	const char *BeginExpansionDiv = "<div class='expansion-view'>";

	const char *EndExpansionDiv = "</div>";

	const char *BeginTable = "<table>";

	const char *EndTable = "</table>";

	const char *ProjectTitleTag = "h1";

	const char *ReportTitleTag = "h2";

	const char *CreatedTimeTag = "h4";

	std::string getPathToStyle(StringRef ViewPath) {
	std::string PathToStyle = "";
	std::string PathSep = sys::path::get_separator();
	unsigned NumSeps = ViewPath.count(PathSep);
	for (unsigned I = 0, E = NumSeps; I < E; ++I)
	PathToStyle += ".." + PathSep;
	return PathToStyle + "style.css";
	}

	void emitPrelude(raw_ostream &OS, const CoverageViewOptions &Opts,
	const std::string &PathToStyle = "") {
	OS << "<!doctype html>"
	"<html>"
	<< BeginHeader;

	// Link to a stylesheet if one is available. Otherwise, use the default style.
	if (PathToStyle.empty())
	OS << "<style>" << CSSForCoverage << "</style>";
	else
	OS << "<link rel='stylesheet' type='text/css' href='"
	<< escape(PathToStyle, Opts) << "'>";

	OS << EndHeader << "<body>";
	}

	void emitEpilog(raw_ostream &OS) {
	OS << "</body>"
	<< "</html>";
	}

	} // anonymous namespace

	Expected<CoveragePrinter::OwnedStream>
	CoveragePrinterHTML::createViewFile(StringRef Path, bool InToplevel) {
	auto OSOrErr = createOutputStream(Path, "html", InToplevel);
	if (!OSOrErr)
	return OSOrErr;

	OwnedStream OS = std::move(OSOrErr.get());

	if (!Opts.hasOutputDirectory()) {
	emitPrelude(*OS.get(), Opts);
	} else {
	std::string ViewPath = getOutputPath(Path, "html", InToplevel);
	emitPrelude(*OS.get(), Opts, getPathToStyle(ViewPath));
	}

	return std::move(OS);
	}

	void CoveragePrinterHTML::closeViewFile(OwnedStream OS) {
	emitEpilog(*OS.get());
	}

	/// Emit column labels for the table in the index.
	static void emitColumnLabelsForIndex(raw_ostream &OS) {
	SmallVector<std::string, 4> Columns;
	Columns.emplace_back(tag("td", "Filename", "column-entry-left"));
	for (const char *Label : {"Function Coverage", "Instantiation Coverage",
	"Line Coverage", "Region Coverage"})
	Columns.emplace_back(tag("td", Label, "column-entry"));
	OS << tag("tr", join(Columns.begin(), Columns.end(), ""));
	}

	/// Render a file coverage summary (\p FCS) in a table row. If \p IsTotals is
	/// false, link the summary to \p SF.
	void CoveragePrinterHTML::emitFileSummary(raw_ostream &OS, StringRef SF,
	const FileCoverageSummary &FCS,
	bool IsTotals) const {
	SmallVector<std::string, 8> Columns;

	// Format a coverage triple and add the result to the list of columns.
	auto AddCoverageTripleToColumn = [&Columns](unsigned Hit, unsigned Total,
	float Pctg) {
	std::string S;
	{
	raw_string_ostream RSO{S};
	if (Total)
	RSO << format("%*.2f", 7, Pctg) << "% ";
	else
	RSO << "- ";
	RSO << '(' << Hit << '/' << Total << ')';
	}
	const char *CellClass = "column-entry-yellow";
	if (Hit == Total)
	CellClass = "column-entry-green";
	else if (Pctg < 80.0)
	CellClass = "column-entry-red";
	Columns.emplace_back(tag("td", tag("pre", S), CellClass));
	};

	// Simplify the display file path, and wrap it in a link if requested.
	std::string Filename;
	if (IsTotals) {
	Filename = "TOTALS";
	} else {
	SmallString<128> LinkTextStr(sys::path::relative_path(FCS.Name));
	sys::path::remove_dots(LinkTextStr, /remove_dot_dots=/true);
	sys::path::native(LinkTextStr);
	std::string LinkText = escape(LinkTextStr, Opts);
	std::string LinkTarget =
	escape(getOutputPath(SF, "html", /InToplevel=/false), Opts);
	Filename = a(LinkTarget, LinkText);
	}

	Columns.emplace_back(tag("td", tag("pre", Filename)));
	AddCoverageTripleToColumn(FCS.FunctionCoverage.Executed,
	FCS.FunctionCoverage.NumFunctions,
	FCS.FunctionCoverage.getPercentCovered());
	AddCoverageTripleToColumn(FCS.InstantiationCoverage.Executed,
	FCS.InstantiationCoverage.NumFunctions,
	FCS.InstantiationCoverage.getPercentCovered());
	AddCoverageTripleToColumn(FCS.LineCoverage.Covered, FCS.LineCoverage.NumLines,
	FCS.LineCoverage.getPercentCovered());
	AddCoverageTripleToColumn(FCS.RegionCoverage.Covered,
	FCS.RegionCoverage.NumRegions,
	FCS.RegionCoverage.getPercentCovered());

	OS << tag("tr", join(Columns.begin(), Columns.end(), ""), "light-row");
	}

	Error CoveragePrinterHTML::createIndexFile(
	ArrayRef<std::string> SourceFiles,
	const coverage::CoverageMapping &Coverage) {
	// Emit the default stylesheet.
	auto CSSOrErr = createOutputStream("style", "css", /InToplevel=/true);
	if (Error E = CSSOrErr.takeError())
	return E;

	OwnedStream CSS = std::move(CSSOrErr.get());
	CSS->operator<<(CSSForCoverage);

	// Emit a file index along with some coverage statistics.
	auto OSOrErr = createOutputStream("index", "html", /InToplevel=/true);
	if (Error E = OSOrErr.takeError())
	return E;
	auto OS = std::move(OSOrErr.get());
	raw_ostream &OSRef = *OS.get();

	assert(Opts.hasOutputDirectory() && "No output directory for index file");
	emitPrelude(OSRef, Opts, getPathToStyle(""));

	// Emit some basic information about the coverage report.
	if (Opts.hasProjectTitle())
	OSRef << tag(ProjectTitleTag, escape(Opts.ProjectTitle, Opts));
	OSRef << tag(ReportTitleTag, "Coverage Report");
	if (Opts.hasCreatedTime())
	OSRef << tag(CreatedTimeTag, escape(Opts.CreatedTimeStr, Opts));

	// Emit a link to some documentation.
	OSRef << tag("p", "Click " +
	a("http://clang.llvm.org/docs/"
	"SourceBasedCodeCoverage.html#interpreting-reports",
	"here") +
	" for information about interpreting this report.");

	// Emit a table containing links to reports for each file in the covmapping.
	OSRef << BeginCenteredDiv << BeginTable;
	emitColumnLabelsForIndex(OSRef);
	FileCoverageSummary Totals("TOTALS");
	auto FileReports =
	CoverageReport::prepareFileReports(Coverage, Totals, SourceFiles);
	for (unsigned I = 0, E = FileReports.size(); I < E; ++I)
	emitFileSummary(OSRef, SourceFiles[I], FileReports[I]);
	emitFileSummary(OSRef, "Totals", Totals, /IsTotals=/true);
	OSRef << EndTable << EndCenteredDiv
	<< tag("h5", escape(Opts.getLLVMVersionString(), Opts));
	emitEpilog(OSRef);

	return Error::success();
	}

	void SourceCoverageViewHTML::renderViewHeader(raw_ostream &OS) {
	OS << BeginCenteredDiv << BeginTable;
	}

	void SourceCoverageViewHTML::renderViewFooter(raw_ostream &OS) {
	OS << EndTable << EndCenteredDiv;
	}

	void SourceCoverageViewHTML::renderSourceName(raw_ostream &OS, bool WholeFile) {
	OS << BeginSourceNameDiv << tag("pre", escape(getSourceName(), getOptions()))
	<< EndSourceNameDiv;
	}

	void SourceCoverageViewHTML::renderLinePrefix(raw_ostream &OS, unsigned) {
	OS << "<tr>";
	}

	void SourceCoverageViewHTML::renderLineSuffix(raw_ostream &OS, unsigned) {
	// If this view has sub-views, renderLine() cannot close the view's cell.
	// Take care of it here, after all sub-views have been rendered.
	if (hasSubViews())
	OS << EndCodeTD;
	OS << "</tr>";
	}

	void SourceCoverageViewHTML::renderViewDivider(raw_ostream &, unsigned) {
	// The table-based output makes view dividers unnecessary.
	}

	void SourceCoverageViewHTML::renderLine(
	raw_ostream &OS, LineRef L, const coverage::CoverageSegment *WrappedSegment,
	CoverageSegmentArray Segments, unsigned ExpansionCol, unsigned) {
	StringRef Line = L.Line;
	unsigned LineNo = L.LineNo;

	// Steps for handling text-escaping, highlighting, and tooltip creation:
	//
	// 1. Split the line into N+1 snippets, where N = \|Segments\|. The first
	// snippet starts from Col=1 and ends at the start of the first segment.
	// The last snippet starts at the last mapped column in the line and ends
	// at the end of the line. Both are required but may be empty.

	SmallVector<std::string, 8> Snippets;

	unsigned LCol = 1;
	auto Snip = [&](unsigned Start, unsigned Len) {
	Snippets.push_back(Line.substr(Start, Len));
	LCol += Len;
	};

	Snip(LCol - 1, Segments.empty() ? 0 : (Segments.front()->Col - 1));

	for (unsigned I = 1, E = Segments.size(); I < E; ++I)
	Snip(LCol - 1, Segments[I]->Col - LCol);

	// \|Line\| + 1 is needed to avoid underflow when, e.g \|Line\| = 0 and LCol = 1.
	Snip(LCol - 1, Line.size() + 1 - LCol);

	// 2. Escape all of the snippets.

	for (unsigned I = 0, E = Snippets.size(); I < E; ++I)
	Snippets[I] = escape(Snippets[I], getOptions());

	// 3. Use \p WrappedSegment to set the highlight for snippet 0. Use segment
	// 1 to set the highlight for snippet 2, segment 2 to set the highlight for
	// snippet 3, and so on.

	Optional<std::string> Color;
	SmallVector<std::pair<unsigned, unsigned>, 2> HighlightedRanges;
	auto Highlight = [&](const std::string &Snippet, unsigned LC, unsigned RC) {
	if (getOptions().Debug)
	HighlightedRanges.emplace_back(LC, RC);
	return tag("span", Snippet, Color.getValue());
	};

	auto CheckIfUncovered = [](const coverage::CoverageSegment *S) {
	return S && S->HasCount && S->Count == 0;
	};

	if (CheckIfUncovered(WrappedSegment)) {
	Color = "red";
	if (!Snippets[0].empty())
	Snippets[0] = Highlight(Snippets[0], 1, 1 + Snippets[0].size());
	}

	for (unsigned I = 0, E = Segments.size(); I < E; ++I) {
	const auto *CurSeg = Segments[I];
	if (CurSeg->Col == ExpansionCol)
	Color = "cyan";
	else if (CheckIfUncovered(CurSeg))
	Color = "red";
	else
	Color = None;

	if (Color.hasValue())
	Snippets[I + 1] = Highlight(Snippets[I + 1], CurSeg->Col,
	CurSeg->Col + Snippets[I + 1].size());
	}

	if (Color.hasValue() && Segments.empty())
	Snippets.back() = Highlight(Snippets.back(), 1, 1 + Snippets.back().size());

	if (getOptions().Debug) {
	for (const auto &Range : HighlightedRanges) {
	errs() << "Highlighted line " << LineNo << ", " << Range.first << " -> ";
	if (Range.second == 0)
	errs() << "?";
	else
	errs() << Range.second;
	errs() << "\n";
	}
	}

	// 4. Snippets[1:N+1] correspond to \p Segments[0:N]: use these to generate
	// sub-line region count tooltips if needed.

	bool HasMultipleRegions = [&] {
	unsigned RegionCount = 0;
	for (const auto *S : Segments)
	if (S->HasCount && S->IsRegionEntry)
	if (++RegionCount > 1)
	return true;
	return false;
	}();

	if (shouldRenderRegionMarkers(HasMultipleRegions)) {
	for (unsigned I = 0, E = Segments.size(); I < E; ++I) {
	const auto *CurSeg = Segments[I];
	if (!CurSeg->IsRegionEntry \|\| !CurSeg->HasCount)
	continue;

	Snippets[I + 1] =
	tag("div", Snippets[I + 1] + tag("span", formatCount(CurSeg->Count),
	"tooltip-content"),
	"tooltip");
	}
	}

	OS << BeginCodeTD;
	OS << BeginPre;
	for (const auto &Snippet : Snippets)
	OS << Snippet;
	OS << EndPre;

	// If there are no sub-views left to attach to this cell, end the cell.
	// Otherwise, end it after the sub-views are rendered (renderLineSuffix()).
	if (!hasSubViews())
	OS << EndCodeTD;
	}

	void SourceCoverageViewHTML::renderLineCoverageColumn(
	raw_ostream &OS, const LineCoverageStats &Line) {
	std::string Count = "";
	if (Line.isMapped())
	Count = tag("pre", formatCount(Line.ExecutionCount));
	std::string CoverageClass =
	(Line.ExecutionCount > 0) ? "covered-line" : "uncovered-line";
	OS << tag("td", Count, CoverageClass);
	}

	void SourceCoverageViewHTML::renderLineNumberColumn(raw_ostream &OS,
	unsigned LineNo) {
	std::string LineNoStr = utostr(uint64_t(LineNo));
	std::string TargetName = "L" + LineNoStr;
	OS << tag("td", a("#" + TargetName, tag("pre", LineNoStr), TargetName),
	"line-number");
	}

	void SourceCoverageViewHTML::renderRegionMarkers(raw_ostream &,
	CoverageSegmentArray,
	unsigned) {
	// Region markers are rendered in-line using tooltips.
	}

	void SourceCoverageViewHTML::renderExpansionSite(
	raw_ostream &OS, LineRef L, const coverage::CoverageSegment *WrappedSegment,
	CoverageSegmentArray Segments, unsigned ExpansionCol, unsigned ViewDepth) {
	// Render the line containing the expansion site. No extra formatting needed.
	renderLine(OS, L, WrappedSegment, Segments, ExpansionCol, ViewDepth);
	}

	void SourceCoverageViewHTML::renderExpansionView(raw_ostream &OS,
	ExpansionView &ESV,
	unsigned ViewDepth) {
	OS << BeginExpansionDiv;
	ESV.View->print(OS, /WholeFile=/false, /ShowSourceName=/false,
	ViewDepth + 1);
	OS << EndExpansionDiv;
	}

	void SourceCoverageViewHTML::renderInstantiationView(raw_ostream &OS,
	InstantiationView &ISV,
	unsigned ViewDepth) {
	OS << BeginExpansionDiv;
	if (!ISV.View)
	OS << BeginSourceNameDiv
	<< tag("pre",
	escape("Unexecuted instantiation: " + ISV.FunctionName.str(),
	getOptions()))
	<< EndSourceNameDiv;
	else
	ISV.View->print(OS, /WholeFile=/false, /ShowSourceName=/true,
	ViewDepth);
	OS << EndExpansionDiv;
	}

	void SourceCoverageViewHTML::renderTitle(raw_ostream &OS, StringRef Title) {
	if (getOptions().hasProjectTitle())
	OS << tag(ProjectTitleTag, escape(getOptions().ProjectTitle, getOptions()));
	OS << tag(ReportTitleTag, escape(Title, getOptions()));
	if (getOptions().hasCreatedTime())
	OS << tag(CreatedTimeTag,
	escape(getOptions().CreatedTimeStr, getOptions()));
	}

	void SourceCoverageViewHTML::renderTableHeader(raw_ostream &OS,
	unsigned FirstUncoveredLineNo,
	unsigned ViewDepth) {
	std::string SourceLabel;
	if (FirstUncoveredLineNo == 0) {
	SourceLabel = tag("td", tag("pre", "Source"));
	} else {
	std::string LinkTarget = "#L" + utostr(uint64_t(FirstUncoveredLineNo));
	SourceLabel =
	tag("td", tag("pre", "Source (" +
	a(LinkTarget, "jump to first uncovered line") +
	")"));
	}

	renderLinePrefix(OS, ViewDepth);
	OS << tag("td", tag("pre", "Line")) << tag("td", tag("pre", "Count"))
	<< SourceLabel;
	renderLineSuffix(OS, ViewDepth);
	}