Added first shot at a development shell

src/d8-readline.cc

Index: src/d8-readline.cc
diff --git a/src/d8-readline.cc b/src/d8-readline.cc
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+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include <readline/readline.h>
+#include <readline/history.h>
+
+
+#include "d8.h"
+
+
+namespace v8 {
+
+
+class ReadLineEditor: public LineEditor {
+ public:
+  ReadLineEditor() : LineEditor(LineEditor::READLINE, "readline") { }
+  virtual i::SmartPointer<char> Prompt(const char* prompt);
+  virtual bool Open();
+  virtual bool Close();
+  virtual void AddHistory(const char* str);
+ private:
+  static char** AttemptedCompletion(const char* text, int start, int end);
+  static char* CompletionGenerator(const char* text, int state);
+  static char kWordBreakCharacters[];
+};
+
+
+static ReadLineEditor read_line_editor;
+char ReadLineEditor::kWordBreakCharacters[] = {' ', '\t', '\n', '"',
+    '\\', '\'', '`', '@', '.', '>', '<', '=', ';', '|', '&', '{', '(',
+    '\0'};
+
+
+bool ReadLineEditor::Open() {
+  rl_initialize();
+  rl_attempted_completion_function = AttemptedCompletion;
+  rl_completer_word_break_characters = kWordBreakCharacters;
+  rl_bind_key('\t', rl_complete);
+  using_history();
+  return read_history(Shell::kHistoryFileName) == 0;
+}
+
+
+bool ReadLineEditor::Close() {
+  return write_history(Shell::kHistoryFileName) == 0;
+}
+
+
+i::SmartPointer<char> ReadLineEditor::Prompt(const char* prompt) {
+  char* result = readline(prompt);
+  return i::SmartPointer<char>(result);
+}
+
+
+void ReadLineEditor::AddHistory(const char* str) {
+  add_history(str);
+}
+
+
+char** ReadLineEditor::AttemptedCompletion(const char* text,
+                                           int start,
+                                           int end) {
+  char** result = rl_completion_matches(text, CompletionGenerator);
+  rl_attempted_completion_over = true;
+  return result;
+}
+
+
+char* ReadLineEditor::CompletionGenerator(const char* text, int state) {
+  static unsigned current_index;
+  static Persistent<Array> current_completions;
+  if (state == 0) {
+    i::SmartPointer<char> full_text(strndup(rl_line_buffer, rl_point));
+    HandleScope scope;
+    Handle<Array> completions =
+      Shell::GetCompletions(String::New(text), String::New(*full_text));
+    current_completions = Persistent<Array>::New(completions);
+    current_index = 0;
+  }
+  if (current_index < current_completions->Length()) {
+    HandleScope scope;
+    Handle<Integer> index = Integer::New(current_index);
+    Handle<Value> str_obj = current_completions->Get(index);
+    current_index++;
+    String::Utf8Value str(str_obj);
+    return strdup(*str);
+  } else {
+    current_completions.Dispose();
+    current_completions.Clear();
+    return NULL;
+  }
+}
+}  // v8