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      1 // Copyright 2016 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_INSPECTOR_STRING16_H_
      6 #define V8_INSPECTOR_STRING16_H_
      7 
      8 #include <stdint.h>
      9 #include <cctype>
     10 #include <climits>
     11 #include <cstring>
     12 #include <string>
     13 #include <vector>
     14 
     15 namespace v8_inspector {
     16 
     17 using UChar = uint16_t;
     18 
     19 class String16 {
     20  public:
     21   static const size_t kNotFound = static_cast<size_t>(-1);
     22 
     23   String16() {}
     24   String16(const String16& other)
     25       : m_impl(other.m_impl), hash_code(other.hash_code) {}
     26   String16(String16&& other)
     27       : m_impl(std::move(other.m_impl)), hash_code(other.hash_code) {}
     28   String16(const UChar* characters, size_t size) : m_impl(characters, size) {}
     29   String16(const UChar* characters)  // NOLINT(runtime/explicit)
     30       : m_impl(characters) {}
     31   String16(const char* characters)  // NOLINT(runtime/explicit)
     32       : String16(characters, std::strlen(characters)) {}
     33   String16(const char* characters, size_t size) {
     34     m_impl.resize(size);
     35     for (size_t i = 0; i < size; ++i) m_impl[i] = characters[i];
     36   }
     37   explicit String16(const std::basic_string<UChar>& impl) : m_impl(impl) {}
     38 
     39   String16& operator=(const String16& other) {
     40     m_impl = other.m_impl;
     41     hash_code = other.hash_code;
     42     return *this;
     43   }
     44   String16& operator=(String16&& other) {
     45     m_impl = std::move(other.m_impl);
     46     hash_code = other.hash_code;
     47     return *this;
     48   }
     49 
     50   static String16 fromInteger(int);
     51   static String16 fromInteger(size_t);
     52   static String16 fromDouble(double);
     53   static String16 fromDouble(double, int precision);
     54 
     55   int toInteger(bool* ok = nullptr) const;
     56   String16 stripWhiteSpace() const;
     57   const UChar* characters16() const { return m_impl.c_str(); }
     58   size_t length() const { return m_impl.length(); }
     59   bool isEmpty() const { return !m_impl.length(); }
     60   UChar operator[](size_t index) const { return m_impl[index]; }
     61   String16 substring(size_t pos, size_t len = UINT_MAX) const {
     62     return String16(m_impl.substr(pos, len));
     63   }
     64   size_t find(const String16& str, size_t start = 0) const {
     65     return m_impl.find(str.m_impl, start);
     66   }
     67   size_t reverseFind(const String16& str, size_t start = UINT_MAX) const {
     68     return m_impl.rfind(str.m_impl, start);
     69   }
     70   size_t find(UChar c, size_t start = 0) const { return m_impl.find(c, start); }
     71   size_t reverseFind(UChar c, size_t start = UINT_MAX) const {
     72     return m_impl.rfind(c, start);
     73   }
     74   void swap(String16& other) {
     75     m_impl.swap(other.m_impl);
     76     std::swap(hash_code, other.hash_code);
     77   }
     78 
     79   // Convenience methods.
     80   std::string utf8() const;
     81   static String16 fromUTF8(const char* stringStart, size_t length);
     82 
     83   std::size_t hash() const {
     84     if (!hash_code) {
     85       for (char c : m_impl) hash_code = 31 * hash_code + c;
     86       // Map hash code 0 to 1. This double the number of hash collisions for 1,
     87       // but avoids recomputing the hash code.
     88       if (!hash_code) ++hash_code;
     89     }
     90     return hash_code;
     91   }
     92 
     93   inline bool operator==(const String16& other) const {
     94     return m_impl == other.m_impl;
     95   }
     96   inline bool operator<(const String16& other) const {
     97     return m_impl < other.m_impl;
     98   }
     99   inline bool operator!=(const String16& other) const {
    100     return m_impl != other.m_impl;
    101   }
    102   inline String16 operator+(const String16& other) const {
    103     return String16(m_impl + other.m_impl);
    104   }
    105 
    106   // Defined later, since it uses the String16Builder.
    107   template <typename... T>
    108   static String16 concat(T... args);
    109 
    110  private:
    111   std::basic_string<UChar> m_impl;
    112   mutable std::size_t hash_code = 0;
    113 };
    114 
    115 inline String16 operator+(const char* a, const String16& b) {
    116   return String16(a) + b;
    117 }
    118 
    119 class String16Builder {
    120  public:
    121   String16Builder();
    122   void append(const String16&);
    123   void append(UChar);
    124   void append(char);
    125   void append(const UChar*, size_t);
    126   void append(const char*, size_t);
    127   void appendNumber(int);
    128   void appendNumber(size_t);
    129   String16 toString();
    130   void reserveCapacity(size_t);
    131 
    132   template <typename T, typename... R>
    133   void appendAll(T first, R... rest) {
    134     append(first);
    135     appendAll(rest...);
    136   }
    137   void appendAll() {}
    138 
    139  private:
    140   std::vector<UChar> m_buffer;
    141 };
    142 
    143 template <typename... T>
    144 String16 String16::concat(T... args) {
    145   String16Builder builder;
    146   builder.appendAll(args...);
    147   return builder.toString();
    148 }
    149 
    150 }  // namespace v8_inspector
    151 
    152 #if !defined(__APPLE__) || defined(_LIBCPP_VERSION)
    153 
    154 namespace std {
    155 template <>
    156 struct hash<v8_inspector::String16> {
    157   std::size_t operator()(const v8_inspector::String16& string) const {
    158     return string.hash();
    159   }
    160 };
    161 
    162 }  // namespace std
    163 
    164 #endif  // !defined(__APPLE__) || defined(_LIBCPP_VERSION)
    165 
    166 #endif  // V8_INSPECTOR_STRING16_H_
    167