[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/inspector_protocol/String16.cpp

+// Copyright 2016 The Chromium 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 "platform/inspector_protocol/String16.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <string>
+
+namespace blink {
+namespace protocol {
+
+namespace internal {
+
+void intToStr(int number, char* buffer, size_t length)
+{
+    std::snprintf(buffer, length, "%d", number);
+}
+
+void doubleToStr(double number, char* buffer, size_t length)
+{
+    std::snprintf(buffer, length, "%f", number);
+}
+
+void doubleToStr3(double number, char* buffer, size_t length)
+{
+    std::snprintf(buffer, length, "%.3g", number);
+}
+
+void doubleToStr6(double number, char* buffer, size_t length)
+{
+    std::snprintf(buffer, length, "%.6g", number);
+}
+
+double strToDouble(const char* buffer, bool* ok)
+{
+    char* endptr;
+    double result = std::strtod(buffer, &endptr);
+    if (ok)
+        *ok = !(*endptr);
+    return result;
+}
+
+int strToInt(const char* buffer, bool* ok)
+{
+    char* endptr;
+    int result = std::strtol(buffer, &endptr, 10);
+    if (ok)
+        *ok = !(*endptr);
+    return result;
+}
+
+} // namespace internal
+
+String16Builder::String16Builder()
+{
+}
+
+void String16Builder::append(const String16& s)
+{
+    m_buffer.insert(m_buffer.end(), s.characters16(), s.characters16() + s.length());
+}
+
+void String16Builder::append(UChar c)
+{
+    m_buffer.insert(m_buffer.end(), c);
+}
+
+void String16Builder::append(char c)
+{
+    UChar u = c;
+    m_buffer.push_back(u);
+}
+
+void String16Builder::append(const UChar* characters, size_t length)
+{
+    m_buffer.insert(m_buffer.end(), characters, characters + length);
+}
+
+void String16Builder::append(const char* characters, size_t length)
+{
+    m_buffer.reserve(m_buffer.size() + length);
+    for (size_t i = 0; i < length; ++i, ++characters) {
+        UChar u = *characters;
+        m_buffer.push_back(u);
+    }
+}
+
+String16 String16Builder::toString()
+{
+    return String16(m_buffer.data(), m_buffer.size());
+}
+
+void String16Builder::reserveCapacity(size_t capacity)
+{
+    m_buffer.reserve(capacity);
+}
+
+} // namespace protocol
+} // namespace blink