[d8] implement console for d8.

src/d8-console.cc

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/d8-console.h"
+#include "src/d8.h"
+
+namespace v8 {
+
+namespace {
+static const char* kConsoleDefaultColor = "";
+static const char* kConsoleRed = "\x1b[31m";
+static const char* kConsoleCyan = "\x1b[36m";
+static const char* kConsoleColorReset = "\x1b[0m";

[rongjie, 2017/04/24 11:35:56]

Note that Windows does not support ANSI color, they will be printed as weird
characters.

You can use Win32 API (SetConsoleTextAttribute) for console color, I can send a
CL later if you want.

+
+void WriteToFile(FILE* file, Isolate* isolate, const char* color,
+                 const debug::ConsoleCallArguments& args) {
+  fprintf(file, "%s", color);
+  for (int i = 0; i < args.Length(); i++) {
+    HandleScope handle_scope(isolate);
+    if (i != 0) fprintf(file, " ");
+
+    // Explicitly catch potential exceptions in toString().
+    v8::TryCatch try_catch(isolate);
+    Local<Value> arg = args[i];
+    Local<String> str_obj;
+
+    if (arg->IsSymbol()) arg = Local<Symbol>::Cast(arg)->Name();
+    if (!arg->ToString(isolate->GetCurrentContext()).ToLocal(&str_obj)) {
+      try_catch.ReThrow();
+      return;
+    }
+
+    v8::String::Utf8Value str(str_obj);
+    int n = static_cast<int>(fwrite(*str, sizeof(**str), str.length(), file));
+    if (n != str.length()) {
+      printf("Error in fwrite\n");
+      Shell::Exit(1);
+    }
+  }
+  fprintf(file, "%s\n", kConsoleColorReset);
+}
+}  // anonymous namespace
+
+D8Console::D8Console(Isolate* isolate) : isolate_(isolate) {
+  default_timer_ = base::TimeTicks::HighResolutionNow();
+}
+
+void D8Console::Log(const debug::ConsoleCallArguments& args) {
+  WriteToFile(stdout, isolate_, kConsoleDefaultColor, args);
+}
+
+void D8Console::Error(const debug::ConsoleCallArguments& args) {
+  WriteToFile(stderr, isolate_, kConsoleRed, args);
+}
+
+void D8Console::Warn(const debug::ConsoleCallArguments& args) {
+  WriteToFile(stdout, isolate_, kConsoleRed, args);
+}
+
+void D8Console::Info(const debug::ConsoleCallArguments& args) {
+  WriteToFile(stdout, isolate_, kConsoleCyan, args);
+}
+
+void D8Console::Debug(const debug::ConsoleCallArguments& args) {
+  WriteToFile(stdout, isolate_, kConsoleDefaultColor, args);
+}
+
+void D8Console::Time(const debug::ConsoleCallArguments& args) {
+  if (args.Length() == 0) {
+    default_timer_ = base::TimeTicks::HighResolutionNow();
+  } else {
+    Local<Value> arg = args[0];
+    Local<String> label;
+    v8::TryCatch try_catch(isolate_);
+    if (!arg->ToString(isolate_->GetCurrentContext()).ToLocal(&label)) {
+      try_catch.ReThrow();
+      return;
+    }
+    v8::String::Utf8Value utf8(label);
+    std::string string(*utf8);
+    auto find = timers_.find(string);
+    if (find != timers_.end()) {
+      find->second = base::TimeTicks::HighResolutionNow();
+    } else {
+      timers_.insert(std::pair<std::string, base::TimeTicks>(
+          string, base::TimeTicks::HighResolutionNow()));
+    }
+  }
+}
+
+void D8Console::TimeEnd(const debug::ConsoleCallArguments& args) {
+  base::TimeDelta delta;
+  base::TimeTicks now = base::TimeTicks::HighResolutionNow();
+  if (args.Length() == 0) {
+    delta = base::TimeTicks::HighResolutionNow() - default_timer_;
+    printf("default: ");
+  } else {
+    Local<Value> arg = args[0];
+    Local<String> label;
+    v8::TryCatch try_catch(isolate_);
+    if (!arg->ToString(isolate_->GetCurrentContext()).ToLocal(&label)) {
+      try_catch.ReThrow();
+      return;
+    }
+    v8::String::Utf8Value utf8(label);
+    std::string string(*utf8);
+    auto find = timers_.find(string);
+    if (find != timers_.end()) {
+      delta = now - find->second;
+    }
+    printf("%s: ", *utf8);
+  }
+  printf("%f\n", delta.InMillisecondsF());
+}
+
+}  // namespace v8