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1 : // EnergyPlus, Copyright (c) 1996-2025, The Board of Trustees of the University of Illinois,
2 : // The Regents of the University of California, through Lawrence Berkeley National Laboratory
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47 :
48 : #ifndef StringUtilities_hh_INCLUDED
49 : #define StringUtilities_hh_INCLUDED
50 :
51 : #include <EnergyPlus/FromChars.hh>
52 : #include <ObjexxFCL/src/ObjexxFCL/Array1S.hh>
53 : #include <fast_float/fast_float.h>
54 : #include <sstream>
55 : #include <type_traits>
56 :
57 : namespace EnergyPlus {
58 420 : inline std::stringstream stringReader(std::string_view str)
59 : {
60 420 : std::stringstream result{str.data()};
61 : // result.imbue(std::locale("C"));
62 420 : return result;
63 : }
64 :
65 : template <class T, typename = std::enable_if_t<std::is_same_v<T, double> || std::is_same_v<T, int>>>
66 7387342 : bool readListItem(std::string_view input, size_t &index, T ¶m)
67 : {
68 7387342 : if (index >= input.size()) {
69 0 : return false;
70 : }
71 :
72 7387342 : input.remove_prefix(index);
73 :
74 7387342 : auto first_comma = input.find_first_not_of(',');
75 7387342 : if (first_comma != std::string_view::npos) {
76 7387342 : input.remove_prefix(first_comma);
77 : }
78 :
79 7387342 : auto first_char = input.find_first_not_of(' ');
80 7387342 : if (first_char != std::string_view::npos) {
81 7387342 : input.remove_prefix(first_char);
82 : }
83 :
84 7387342 : FromChars::from_chars_result result{};
85 : if constexpr (std::is_same_v<T, int>) {
86 1420635 : result = FromChars::from_chars(input.data(), input.data() + input.size(), param);
87 : } else if constexpr (std::is_same_v<T, double>) {
88 5966707 : auto fast_float_result = fast_float::from_chars(input.data(), input.data() + input.size(), param);
89 5966707 : result.ptr = fast_float_result.ptr;
90 5966707 : result.ec = fast_float_result.ec;
91 : }
92 7387342 : if (result.ec == std::errc::result_out_of_range || result.ec == std::errc::invalid_argument) {
93 0 : return false;
94 : }
95 7387342 : size_t pos = result.ptr - input.data();
96 7387342 : index += (pos + first_comma + first_char);
97 7387342 : return true;
98 : }
99 :
100 280 : template <typename Param> bool readListItem(std::istream &stream, Param &¶m)
101 : {
102 280 : if (stream.good()) {
103 280 : stream >> param;
104 280 : if (stream.good() && stream.peek() == ',') {
105 0 : stream.get(); // eat comma
106 : }
107 : } else {
108 : // the stream was not good, it was, perhaps EOF. So we need to
109 : // set the fail bit here to say that we ran out of string
110 : // and were unable to read the next bit of data
111 0 : stream.setstate(std::ios_base::failbit);
112 : }
113 :
114 280 : return !stream.fail();
115 : }
116 :
117 40 : template <typename Param> bool readItem(std::string_view input, Param &¶m)
118 : {
119 40 : auto stream = stringReader(input);
120 40 : stream >> param;
121 80 : return !stream.fail() && stream.eof();
122 40 : }
123 :
124 : inline auto nth_occurrence(std::string_view input_str, std::string_view search_str, std::size_t Nth)
125 : {
126 : if (Nth == 0) {
127 : return std::string_view::npos;
128 : }
129 : std::string_view::size_type pos = 0;
130 : size_t cnt{};
131 :
132 : do {
133 : pos = input_str.find(search_str, pos);
134 : if (pos == std::string_view::npos) {
135 : return std::string_view::npos;
136 : }
137 : ++cnt;
138 : ++pos;
139 : } while (cnt != Nth);
140 :
141 : return pos;
142 : }
143 :
144 : // Returns the position **after** the nth occurrence of the search_char, eg:
145 : // eg: Given a string test="aa,bb,cc", nth_occurrence(test, ',', x), for x = 1 it gives 3, and for x = 2 it gives 6
146 852381 : inline auto nth_occurrence(std::string_view input_str, char const search_char, std::size_t Nth)
147 : {
148 852381 : if (Nth == 0) {
149 0 : return std::string_view::npos;
150 : }
151 852381 : std::string_view::size_type pos = 0;
152 852381 : size_t cnt{};
153 :
154 : do {
155 9092064 : pos = input_str.find(search_char, pos);
156 9092064 : if (pos == std::string_view::npos) {
157 0 : return std::string_view::npos;
158 : }
159 9092064 : ++cnt;
160 9092064 : ++pos;
161 9092064 : } while (cnt != Nth);
162 :
163 852381 : return pos;
164 : }
165 :
166 568289 : template <typename... Param> bool readList(std::string_view input, Param &&...param)
167 : {
168 : if constexpr (std::conjunction_v<std::is_same<double &, Param>...> || std::conjunction_v<std::is_same<int &, Param>...>) {
169 568259 : size_t index = 0;
170 568259 : return ((readListItem(input, index, param)), ...);
171 : } else {
172 30 : auto reader = stringReader(input);
173 60 : return ((readListItem(reader, param)), ...);
174 30 : }
175 : }
176 :
177 : } // namespace EnergyPlus
178 :
179 : namespace ObjexxFCL {
180 : // since this is a slice (reference) we want to bind to temporaries
181 : // so we're going to allow that where the one provided by Array1S.hh does not
182 : template <typename T> std::istream &operator>>(std::istream &stream, Array1S<T> &&a)
183 : {
184 : // just pass on to the `&` version of this operator>>
185 : return stream >> a;
186 : }
187 : } // namespace ObjexxFCL
188 :
189 : #endif
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