[inspector] Initial import of v8_inspector.

src/inspector/String16.h

Index: src/inspector/String16.h
diff --git a/src/inspector/String16.h b/src/inspector/String16.h
new file mode 100644
index 0000000000000000000000000000000000000000..e342fe83398afb1e6d2d7d3683be6757b5d9e513
--- /dev/null
+++ b/src/inspector/String16.h
@@ -0,0 +1,132 @@
+// Copyright 2016 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.
+
+#ifndef V8_INSPECTOR_STRING16_H_
+#define V8_INSPECTOR_STRING16_H_
+
+#include <stdint.h>
+#include <cctype>
+#include <climits>
+#include <cstring>
+#include <string>
+#include <vector>
+
+namespace v8_inspector {
+
+using UChar = uint16_t;
+
+class String16 {
+ public:
+  static const size_t kNotFound = static_cast<size_t>(-1);
+
+  String16() {}
+  String16(const String16& other) : m_impl(other.m_impl) {}
+  String16(const UChar* characters, size_t size) : m_impl(characters, size) {}
+  String16(const UChar* characters) : m_impl(characters) {}
+  String16(const char* characters)
+      : String16(characters, std::strlen(characters)) {}
+  String16(const char* characters, size_t size) {
+    m_impl.resize(size);
+    for (size_t i = 0; i < size; ++i) m_impl[i] = characters[i];
+  }
+
+  static String16 fromInteger(int);
+  static String16 fromDouble(double);
+  static String16 fromDoublePrecision3(double);
+  static String16 fromDoublePrecision6(double);
+
+  int toInteger(bool* ok = nullptr) const;
+  String16 stripWhiteSpace() const;
+  const UChar* characters16() const { return m_impl.c_str(); }
+  size_t length() const { return m_impl.length(); }
+  bool isEmpty() const { return !m_impl.length(); }
+  UChar operator[](unsigned index) const { return m_impl[index]; }
+  String16 substring(unsigned pos, unsigned len = UINT_MAX) const {
+    return String16(m_impl.substr(pos, len));
+  }
+  size_t find(const String16& str, unsigned start = 0) const {
+    return m_impl.find(str.m_impl, start);
+  }
+  size_t reverseFind(const String16& str, unsigned start = UINT_MAX) const {
+    return m_impl.rfind(str.m_impl, start);
+  }
+  void swap(String16& other) { m_impl.swap(other.m_impl); }
+
+  // Convenience methods.
+  std::string utf8() const;
+  static String16 fromUTF8(const char* stringStart, size_t length);
+
+  const std::basic_string<UChar>& impl() const { return m_impl; }
+  explicit String16(const std::basic_string<UChar>& impl) : m_impl(impl) {}
+
+  std::size_t hash() const {
+    if (!has_hash) {
+      size_t hash = 0;
+      for (size_t i = 0; i < length(); ++i) hash = 31 * hash + m_impl[i];
+      hash_code = hash;
+      has_hash = true;
+    }
+    return hash_code;
+  }
+
+ private:
+  std::basic_string<UChar> m_impl;
+  mutable bool has_hash = false;
+  mutable std::size_t hash_code = 0;
+};
+
+inline bool operator==(const String16& a, const String16& b) {
+  return a.impl() == b.impl();
+}
+inline bool operator<(const String16& a, const String16& b) {
+  return a.impl() < b.impl();
+}
+inline bool operator!=(const String16& a, const String16& b) {
+  return a.impl() != b.impl();
+}
+inline bool operator==(const String16& a, const char* b) {
+  return a.impl() == String16(b).impl();
+}
+inline String16 operator+(const String16& a, const char* b) {
+  return String16(a.impl() + String16(b).impl());
+}
+inline String16 operator+(const char* a, const String16& b) {
+  return String16(String16(a).impl() + b.impl());
+}
+inline String16 operator+(const String16& a, const String16& b) {
+  return String16(a.impl() + b.impl());
+}
+
+class String16Builder {
+ public:
+  String16Builder();
+  void append(const String16&);
+  void append(UChar);
+  void append(char);
+  void append(const UChar*, size_t);
+  void append(const char*, size_t);
+  String16 toString();
+  void reserveCapacity(size_t);
+
+ private:
+  std::vector<UChar> m_buffer;
+};
+
+}  // namespace v8_inspector
+
+#if !defined(__APPLE__) || defined(_LIBCPP_VERSION)
+
+namespace std {
+template <>
+struct hash<v8_inspector::String16> {
+  std::size_t operator()(const v8_inspector::String16& string) const {
+    return string.hash();
+  }
+};
+
+}  // namespace std
+
+#endif  // !defined(__APPLE__) || defined(_LIBCPP_VERSION)
+
+#endif  // V8_INSPECTOR_STRING16_H_