openMSX
StringOp.hh
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1 #ifndef STRINGOP_HH
2 #define STRINGOP_HH
3 
4 #include "IterableBitSet.hh"
5 #include "likely.hh"
6 #include "stringsp.hh"
7 #include <algorithm>
8 #include <charconv>
9 #include <cstdint>
10 #include <iomanip>
11 #include <limits>
12 #include <optional>
13 #include <sstream>
14 #include <string>
15 #include <string_view>
16 #include <type_traits>
17 #include <utility>
18 #if defined(__APPLE__)
19 #include <CoreFoundation/CoreFoundation.h>
20 #endif
21 
22 namespace StringOp
23 {
43  template<typename T> [[nodiscard]] std::optional<T> stringTo(std::string_view s);
44 
48  template<int BASE, typename T> [[nodiscard]] std::optional<T> stringToBase(std::string_view s);
49 
50  [[nodiscard]] bool stringToBool(std::string_view str);
51 
52  //[[nodiscard]] std::string toLower(std::string_view str);
53 
54  void trimRight(std::string& str, const char* chars);
55  void trimRight(std::string& str, char chars);
56  void trimRight(std::string_view& str, std::string_view chars);
57  void trimRight(std::string_view& str, char chars);
58  void trimLeft (std::string& str, const char* chars);
59  void trimLeft (std::string& str, char chars);
60  void trimLeft (std::string_view& str, std::string_view chars);
61  void trimLeft (std::string_view& str, char chars);
62  void trim (std::string_view& str, std::string_view chars);
63  void trim (std::string_view& str, char chars);
64 
65  [[nodiscard]] std::pair<std::string_view, std::string_view> splitOnFirst(
66  std::string_view str, std::string_view chars);
67  [[nodiscard]] std::pair<std::string_view, std::string_view> splitOnFirst(
68  std::string_view str, char chars);
69  [[nodiscard]] std::pair<std::string_view, std::string_view> splitOnLast(
70  std::string_view str, std::string_view chars);
71  [[nodiscard]] std::pair<std::string_view, std::string_view> splitOnLast(
72  std::string_view str, char chars);
73  [[nodiscard]] IterableBitSet<64> parseRange(std::string_view str,
74  unsigned min, unsigned max);
75 
76  //[[nodiscard]] std::vector<std::string_view> split(std::string_view str, char chars);
77 
78  [[nodiscard]] inline auto split_view(std::string_view str, char c) {
79  struct Sentinel {};
80 
81  struct Iterator {
82  std::string_view str;
83  std::string_view::size_type p;
84  const char c;
85 
86  Iterator(std::string_view str_, char c_)
87  : str(str_), c(c_) {
88  next_p();
89  }
90 
91  [[nodiscard]] std::string_view operator*() const {
92  return std::string_view(str.data(), p);
93  }
94 
95  Iterator& operator++() {
96  if (p < str.size()) {
97  str.remove_prefix(p + 1);
98  next_p();
99  } else {
100  str = "";
101  }
102  return *this;
103  }
104 
105  [[nodiscard]] bool operator==(Sentinel) const { return str.empty(); }
106  [[nodiscard]] bool operator!=(Sentinel) const { return !str.empty(); }
107 
108  void next_p() {
109  p = 0;
110  while ((p < str.size()) && (str[p] != c)) ++p;
111  }
112  };
113 
114  struct Splitter {
115  std::string_view str;
116  char c;
117 
118  [[nodiscard]] auto begin() const { return Iterator{str, c}; }
119  [[nodiscard]] auto end() const { return Sentinel{}; }
120  };
121 
122  return Splitter{str, c};
123  }
124 
125  // case insensitive less-than operator
126  struct caseless {
127  [[nodiscard]] bool operator()(std::string_view s1, std::string_view s2) const {
128  auto m = std::min(s1.size(), s2.size());
129  int r = strncasecmp(s1.data(), s2.data(), m);
130  return (r != 0) ? (r < 0) : (s1.size() < s2.size());
131  }
132  };
133  struct casecmp {
134  [[nodiscard]] bool operator()(std::string_view s1, std::string_view s2) const {
135  if (s1.size() != s2.size()) return false;
136  return strncasecmp(s1.data(), s2.data(), s1.size()) == 0;
137  }
138  };
139 
140 #if defined(__APPLE__)
141  [[nodiscard]] std::string fromCFString(CFStringRef str);
142 #endif
143 
144  template<int BASE, typename T>
145  [[nodiscard]] std::optional<T> stringToBase(std::string_view s)
146  {
147  T result;
148  auto b = s.data();
149  auto e = s.data() + s.size();
150  if (auto [p, ec] = std::from_chars(b, e, result, BASE);
151  (ec == std::errc()) && (p == e)) {
152  return result;
153  }
154  return std::nullopt;
155  }
156 
157  template<typename T>
158  [[nodiscard]] std::optional<T> stringTo(std::string_view s)
159  {
160  if (unlikely(s.empty())) return {};
161  if constexpr (std::is_signed_v<T>) {
162  bool negate = false;
163  if (unlikely(s[0] == '-')) {
164  negate = true;
165  s.remove_prefix(1);
166  }
167 
168  using U = std::make_unsigned_t<T>;
169  auto tmp = stringTo<U>(s);
170  if (unlikely(!tmp)) return {};
171 
172  U max = U(std::numeric_limits<T>::max()) + 1; // 0x8000
173  if (unlikely(negate)) {
174  if (unlikely(*tmp > max)) return {}; // 0x8000
175  return T(~*tmp + 1);
176  } else {
177  if (unlikely(*tmp >= max)) return {}; // 0x7fff
178  return T(*tmp);
179  }
180  } else {
181  if (likely(s[0] != '0')) {
182  return stringToBase<10, T>(s);
183  } else {
184  if (s.size() == 1) return T(0);
185  if (likely((s[1] == 'x') || (s[1] == 'X'))) {
186  s.remove_prefix(2);
187  return stringToBase<16, T>(s);
188  } else if ((s[1] == 'b') || (s[1] == 'B')) {
189  s.remove_prefix(2);
190  return stringToBase<2, T>(s);
191  } else {
192  return stringToBase<10, T>(s);
193  }
194  }
195  }
196  }
197 }
198 
199 #endif
IterableBitSet.
#define likely(x)
Definition: likely.hh:14
#define unlikely(x)
Definition: likely.hh:15
void trim(string_view &str, string_view chars)
Definition: StringOp.cc:79
IterableBitSet< 64 > parseRange(string_view str, unsigned min, unsigned max)
Definition: StringOp.cc:177
bool stringToBool(string_view str)
Definition: StringOp.cc:12
std::optional< T > stringToBase(std::string_view s)
As above, but without dynamic base detection.
Definition: StringOp.hh:145
std::pair< string_view, string_view > splitOnLast(string_view str, string_view chars)
Definition: StringOp.cc:108
void trimRight(string &str, const char *chars)
Definition: StringOp.cc:29
std::optional< T > stringTo(std::string_view s)
Convert a string to an integral type 'T' (int, uint64_t, ...).
Definition: StringOp.hh:158
std::pair< string_view, string_view > splitOnFirst(string_view str, string_view chars)
Definition: StringOp.cc:91
void trimLeft(string &str, const char *chars)
Definition: StringOp.cc:58
auto split_view(std::string_view str, char c)
Definition: StringOp.hh:78
constexpr vecN< N, T > min(const vecN< N, T > &x, const vecN< N, T > &y)
Definition: gl_vec.hh:269
constexpr vecN< N, T > max(const vecN< N, T > &x, const vecN< N, T > &y)
Definition: gl_vec.hh:287
bool operator!=(const Event &x, const Event &y)
Definition: Event.hh:64
bool operator==(const Event &x, const Event &y)
Definition: Event.cc:11
bool operator()(std::string_view s1, std::string_view s2) const
Definition: StringOp.hh:134
bool operator()(std::string_view s1, std::string_view s2) const
Definition: StringOp.hh:127
constexpr uint128 operator*(const uint128 &a, const uint128 &b)
Definition: uint128.hh:187
constexpr auto begin(const zstring_view &x)
constexpr auto end(const zstring_view &x)