[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/inspector_protocol/String16STL.h

 // 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.
 
 #ifndef String16STL_h
 #define String16STL_h
 
 #include <cctype>
 #include <cstdlib>
 #include <cstring>
 #include <stdint.h>
 #include <string>
 #include <vector>
 
 using UChar = uint16_t;
-using UChar32 = uint32_t;
-using LChar = unsigned char;
-// presubmit: allow wstring
-using wstring = std::basic_string<UChar>;
-const size_t kNotFound = static_cast<size_t>(-1);
 
 namespace blink {
 namespace protocol {
 
-class String16 {
+class String16 : public String16Base<String16, UChar> {
 public:
+    static const size_t kNotFound = static_cast<size_t>(-1);
+
     String16() { }
     String16(const String16& other) : m_impl(other.m_impl) { }
-    // presubmit: allow wstring
-    String16(const wstring& impl) : m_impl(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];
     }
-    String16(const UChar* characters, size_t size) : m_impl(characters, size) { }
+
     String16 isolatedCopy() const { return String16(m_impl); }
-
-    size_t charactersSizeInBytes() const { return m_impl.size() * sizeof(UChar); }
     const UChar* characters16() const { return m_impl.c_str(); }
-    std::string utf8() const;
-    static String16 fromUTF8(const char* stringStart, size_t length);
-    static String16 fromInteger(int i) { return String16(String16::intToString(i).c_str()); }
-    static String16 fromDouble(double d) { return String16(String16::doubleToString(d).c_str()); }
-    static String16 fromDoubleFixedPrecision(double d, int len) { return String16(String16::doubleToString(d).c_str()); }
-
-    static double charactersToDouble(const UChar* characters, size_t length, bool* ok = 0)
-    {
-        std::string str;
-        str.resize(length);
-        for (size_t i = 0; i < length; ++i)
-            str[i] = static_cast<char>(characters[i]);
-
-        const char* buffer = str.c_str();
-        char* endptr;
-        double result = strtod(buffer, &endptr);
-        if (ok)
-            *ok = buffer + length == endptr;
-        return result;
-    }
-
-    String16 substring(unsigned pos, unsigned len = 0xFFFFFFFF) const
-    {
-        return String16(m_impl.substr(pos, len));
-    }
-
-    String16 stripWhiteSpace() const;
-
-    int toInt(bool* ok = 0) const
-    {
-        size_t length = m_impl.length();
-        std::string str;
-        str.resize(length);
-        for (size_t i = 0; i < length; ++i)
-            str[i] = static_cast<char>(m_impl[i]);
-
-        const char* buffer = str.c_str();
-        char* endptr;
-        int result = strtol(buffer, &endptr, 10);
-        if (ok)
-            *ok = buffer + length == endptr;
-        return result;
-    }
-
     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 = 0xFFFFFFFF) 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 = 0xFFFFFFFF) const { return m_impl.rfind(str.m_impl, start); }
 
-    size_t find(UChar c, unsigned start = 0) const
-    {
-        return m_impl.find(c, start);
-    }
+    // Convenience methods.
+    std::string utf8() const;
+    static String16 fromUTF8(const char* stringStart, size_t length);
 
-    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 = 0xFFFFFFFF) const
-    {
-        return m_impl.rfind(str.m_impl, start);
-    }
-
-    bool startWith(const String16& s) const
-    {
-        if (m_impl.length() < s.m_impl.length())
-            return false;
-        return m_impl.substr(0, s.m_impl.length()) == s.m_impl;
-    }
-
-    bool endsWith(UChar character) const
-    {
-        return m_impl.length() && m_impl[m_impl.length() - 1] == character;
-    }
-
-    // presubmit: allow wstring
-    const wstring& impl() const { return m_impl; }
+    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:
-    static std::string intToString(int);
-    static std::string doubleToString(double);
-    // presubmit: allow wstring
-    wstring m_impl;
+    std::basic_string<UChar> m_impl;
     mutable bool has_hash = false;
     mutable std::size_t hash_code = 0;
 };
 
-static inline bool isSpaceOrNewline(UChar c)
-{
-    return std::isspace(c);  // NOLINT
-}
-
-class String16Builder {
-public:
-    String16Builder() { }
-
-    void append(const String16& str)
-    {
-        m_impl += str.impl();
-    }
-
-    void append(UChar c)
-    {
-        m_impl += c;
-    }
-
-    void append(LChar c)
-    {
-        m_impl += c;
-    }
-
-    void append(char c)
-    {
-        m_impl += c;
-    }
-
-    void appendNumber(int i)
-    {
-        m_impl = m_impl + String16::fromInteger(i).impl();
-    }
-
-    void appendNumber(double d)
-    {
-        m_impl = m_impl + String16::fromDoubleFixedPrecision(d, 6).impl();
-    }
-
-    void append(const UChar* c, size_t length)
-    {
-        // presubmit: allow wstring
-        m_impl += wstring(c, length);
-    }
-
-    void append(const char* c, size_t length)
-    {
-        m_impl += String16(c, length).impl();
-    }
-
-    String16 toString()
-    {
-        return String16(m_impl);
-    }
-
-    void reserveCapacity(unsigned newCapacity)
-    {
-    }
-
-private:
-    // presubmit: allow wstring
-    wstring m_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 bool operator<(const String16& a, const String16& b) { return a.impl() < 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());
-}
+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()); }
 
 } // namespace protocol
 } // namespace blink
 
-using String16 = blink::protocol::String16;
-using String16Builder = blink::protocol::String16Builder;
-
-
-namespace WTF {
-// Interim solution for those headers that reference WTF::String for overrides.
-// It does nothing. If the code actually relies on WTF:String, it will not
-// compile!
-// TODO(eostroukhov): Eradicate
-class String {
-public:
-    String() {};
-    String(const String16& other) {};
-    operator String16() const { return String16(); };
-};
-} // namespace WTF
-
 #if !defined(__APPLE__) || defined(_LIBCPP_VERSION)
 
 namespace std {
-template<> struct hash<String16> {
-    std::size_t operator()(const String16& string) const
+template<> struct hash<blink::protocol::String16> {
+    std::size_t operator()(const blink::protocol::String16& string) const
     {
         return string.hash();
     }
 };
 
 } // namespace std
 
 #endif // !defined(__APPLE__) || defined(_LIBCPP_VERSION)
 
-using String = WTF::String;
+class InspectorProtocolConvenienceStringType {
+public:
+    // This class should not be ever instantiated, so we don't implement constructors.
+    InspectorProtocolConvenienceStringType();
+    InspectorProtocolConvenienceStringType(const blink::protocol::String16& other);
+    operator blink::protocol::String16() const { return blink::protocol::String16(); };
+};
 
 #endif // !defined(String16STL_h)