--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/llvm-pdbutil/DiffPrinter.cpp	Fri Oct 27 17:07:41 2017 +0900
@@ -0,0 +1,147 @@
+
+#include "DiffPrinter.h"
+
+#include "llvm/Support/FormatAdapters.h"
+
+using namespace llvm;
+using namespace llvm::pdb;
+
+namespace {
+struct Colorize {
+  Colorize(raw_ostream &OS, DiffResult Result) : OS(OS) {
+    if (!OS.has_colors())
+      return;
+    switch (Result) {
+    case DiffResult::IDENTICAL:
+      OS.changeColor(raw_ostream::Colors::GREEN, false);
+      break;
+    case DiffResult::EQUIVALENT:
+      OS.changeColor(raw_ostream::Colors::YELLOW, true);
+      break;
+    default:
+      OS.changeColor(raw_ostream::Colors::RED, false);
+      break;
+    }
+  }
+
+  ~Colorize() {
+    if (OS.has_colors())
+      OS.resetColor();
+  }
+
+  raw_ostream &OS;
+};
+}
+
+DiffPrinter::DiffPrinter(uint32_t Indent, StringRef Header,
+                         uint32_t PropertyWidth, uint32_t FieldWidth,
+                         bool Result, bool Fields, raw_ostream &Stream)
+    : PrintResult(Result), PrintValues(Fields), Indent(Indent),
+      PropertyWidth(PropertyWidth), FieldWidth(FieldWidth), OS(Stream) {
+  printHeaderRow();
+  printFullRow(Header);
+}
+
+DiffPrinter::~DiffPrinter() {}
+
+uint32_t DiffPrinter::tableWidth() const {
+  // `|`
+  uint32_t W = 1;
+
+  // `<width>|`
+  W += PropertyWidth + 1;
+
+  if (PrintResult) {
+    // ` I |`
+    W += 4;
+  }
+
+  if (PrintValues) {
+    // `<width>|<width>|`
+    W += 2 * (FieldWidth + 1);
+  }
+  return W;
+}
+
+void DiffPrinter::printFullRow(StringRef Text) {
+  newLine();
+  printValue(Text, DiffResult::UNSPECIFIED, AlignStyle::Center,
+             tableWidth() - 2, true);
+  printSeparatorRow();
+}
+
+void DiffPrinter::printSeparatorRow() {
+  newLine();
+  OS << formatv("{0}", fmt_repeat('-', PropertyWidth));
+  if (PrintResult) {
+    OS << '+';
+    OS << formatv("{0}", fmt_repeat('-', 3));
+  }
+  if (PrintValues) {
+    OS << '+';
+    OS << formatv("{0}", fmt_repeat('-', FieldWidth));
+    OS << '+';
+    OS << formatv("{0}", fmt_repeat('-', FieldWidth));
+  }
+  OS << '|';
+}
+
+void DiffPrinter::printHeaderRow() {
+  newLine('-');
+  OS << formatv("{0}", fmt_repeat('-', tableWidth() - 1));
+}
+
+void DiffPrinter::newLine(char InitialChar) {
+  OS << "\n";
+  OS.indent(Indent) << InitialChar;
+}
+
+void DiffPrinter::printExplicit(StringRef Property, DiffResult C,
+                                StringRef Left, StringRef Right) {
+  newLine();
+  printValue(Property, DiffResult::UNSPECIFIED, AlignStyle::Right,
+             PropertyWidth, true);
+  printResult(C);
+  printValue(Left, C, AlignStyle::Center, FieldWidth, false);
+  printValue(Right, C, AlignStyle::Center, FieldWidth, false);
+  printSeparatorRow();
+}
+
+void DiffPrinter::printResult(DiffResult Result) {
+  if (!PrintResult)
+    return;
+  switch (Result) {
+  case DiffResult::DIFFERENT:
+    printValue("D", Result, AlignStyle::Center, 3, true);
+    break;
+  case DiffResult::EQUIVALENT:
+    printValue("E", Result, AlignStyle::Center, 3, true);
+    break;
+  case DiffResult::IDENTICAL:
+    printValue("I", Result, AlignStyle::Center, 3, true);
+    break;
+  case DiffResult::UNSPECIFIED:
+    printValue(" ", Result, AlignStyle::Center, 3, true);
+    break;
+  }
+}
+
+void DiffPrinter::printValue(StringRef Value, DiffResult C, AlignStyle Style,
+                             uint32_t Width, bool Force) {
+  if (!Force && !PrintValues)
+    return;
+
+  if (Style == AlignStyle::Right)
+    --Width;
+
+  std::string FormattedItem =
+      formatv("{0}", fmt_align(Value, Style, Width)).str();
+  if (C != DiffResult::UNSPECIFIED) {
+    Colorize Color(OS, C);
+    OS << FormattedItem;
+  } else
+    OS << FormattedItem;
+  if (Style == AlignStyle::Right)
+    OS << ' ';
+  OS << '|';
+}