openMSX
StringOp.hh
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1#ifndef STRINGOP_HH
2#define STRINGOP_HH
3
4#include "IterableBitSet.hh"
5#include "stringsp.hh"
6#include <algorithm>
7#include <charconv>
8#include <concepts>
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
22namespace StringOp
23{
43 template<std::integral T> [[nodiscard]] std::optional<T> stringTo(std::string_view s);
44
48 template<int BASE, std::integral 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 using value_type = std::string_view;
83 using difference_type = ptrdiff_t;
84
85 Iterator() = default;
86 Iterator(const Iterator&) = default;
87 Iterator& operator=(const Iterator&) = default;
88
89 Iterator(std::string_view str_, char c_)
90 : str(str_), c(c_) {
91 next_p();
92 }
93
94 [[nodiscard]] std::string_view operator*() const {
95 return std::string_view(str.data(), p);
96 }
97
98 Iterator& operator++() {
99 if (p < str.size()) {
100 str.remove_prefix(p + 1);
101 next_p();
102 } else {
103 str = "";
104 }
105 return *this;
106 }
107 Iterator operator++(int) { auto copy = *this; ++(*this); return copy; }
108
109 [[nodiscard]] bool operator==(const Iterator&) const = default;
110 [[nodiscard]] bool operator==(Sentinel) const { return str.empty(); }
111
112 void next_p() {
113 p = 0;
114 while ((p < str.size()) && (str[p] != c)) ++p;
115 }
116
117 private:
118 std::string_view str;
119 std::string_view::size_type p;
120 char c;
121 };
122 static_assert(std::forward_iterator<Iterator>);
123 static_assert(std::sentinel_for<Sentinel, Iterator>);
124
125 struct Splitter {
126 std::string_view str;
127 char c;
128
129 [[nodiscard]] auto begin() const { return Iterator{str, c}; }
130 [[nodiscard]] auto end() const { return Sentinel{}; }
131 };
132
133 return Splitter{str, c};
134 }
135
136 // case insensitive less-than operator
137 struct caseless {
138 [[nodiscard]] bool operator()(std::string_view s1, std::string_view s2) const {
139 auto m = std::min(s1.size(), s2.size());
140 int r = strncasecmp(s1.data(), s2.data(), m);
141 return (r != 0) ? (r < 0) : (s1.size() < s2.size());
142 }
143 };
144 struct casecmp {
145 [[nodiscard]] bool operator()(std::string_view s1, std::string_view s2) const {
146 if (s1.size() != s2.size()) return false;
147 return strncasecmp(s1.data(), s2.data(), s1.size()) == 0;
148 }
149 };
150
151#if defined(__APPLE__)
152 [[nodiscard]] std::string fromCFString(CFStringRef str);
153#endif
154
155 template<int BASE, std::integral T>
156 [[nodiscard]] std::optional<T> stringToBase(std::string_view s)
157 {
158 T result;
159 auto b = s.data();
160 auto e = s.data() + s.size();
161 if (auto [p, ec] = std::from_chars(b, e, result, BASE);
162 (ec == std::errc()) && (p == e)) {
163 return result;
164 }
165 return std::nullopt;
166 }
167
168 template<std::integral T>
169 [[nodiscard]] std::optional<T> stringTo(std::string_view s)
170 {
171 if (s.empty()) [[unlikely]] return {};
172 if constexpr (std::is_signed_v<T>) {
173 bool negate = false;
174 if (s[0] == '-') [[unlikely]] {
175 negate = true;
176 s.remove_prefix(1);
177 }
178
179 using U = std::make_unsigned_t<T>;
180 auto tmp = stringTo<U>(s);
181 if (!tmp) [[unlikely]] return {};
182
183 U max = U(std::numeric_limits<T>::max()) + 1; // 0x8000
184 if (negate) [[unlikely]] {
185 if (*tmp > max) [[unlikely]] return {}; // 0x8000
186 return T(~*tmp + 1);
187 } else {
188 if (*tmp >= max) [[unlikely]] return {}; // 0x7fff
189 return T(*tmp);
190 }
191 } else {
192 if (s[0] != '0') [[likely]] {
193 return stringToBase<10, T>(s);
194 } else {
195 if (s.size() == 1) return T(0);
196 if ((s[1] == 'x') || (s[1] == 'X')) [[likely]] {
197 s.remove_prefix(2);
198 return stringToBase<16, T>(s);
199 } else if ((s[1] == 'b') || (s[1] == 'B')) {
200 s.remove_prefix(2);
201 return stringToBase<2, T>(s);
202 } else {
203 return stringToBase<10, T>(s);
204 }
205 }
206 }
207 }
208}
209
210#endif
IterableBitSet.
constexpr double e
Definition: Math.hh:18
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:156
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:169
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:265
constexpr vecN< N, T > max(const vecN< N, T > &x, const vecN< N, T > &y)
Definition: gl_vec.hh:283
bool operator==(const Event &x, const Event &y)
Definition: Event.cc:11
auto copy(InputRange &&range, OutputIter out)
Definition: ranges.hh:208
bool operator()(std::string_view s1, std::string_view s2) const
Definition: StringOp.hh:145
bool operator()(std::string_view s1, std::string_view s2) const
Definition: StringOp.hh:138
constexpr uint128 operator*(const uint128 &a, const uint128 &b)
Definition: uint128.hh:189
constexpr auto begin(const zstring_view &x)
constexpr auto end(const zstring_view &x)