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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
3 : // (subject to receipt of any required approvals from the U.S. Dept. of Energy), Oak Ridge
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31 : // software as "EnergyPlus version X" software, where "X" is the version number Licensee
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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 38 : inline std::stringstream stringReader(std::string_view str)
59 : {
60 38 : std::stringstream result{str.data()};
61 : // result.imbue(std::locale("C"));
62 38 : 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 718448 : bool readListItem(std::string_view input, size_t &index, T ¶m)
67 : {
68 718448 : if (index >= input.size()) return false;
69 :
70 718448 : input.remove_prefix(index);
71 :
72 718448 : auto first_comma = input.find_first_not_of(',');
73 718448 : if (first_comma != std::string_view::npos) {
74 718448 : input.remove_prefix(first_comma);
75 : }
76 :
77 718448 : auto first_char = input.find_first_not_of(' ');
78 718448 : if (first_char != std::string_view::npos) {
79 718448 : input.remove_prefix(first_char);
80 : }
81 :
82 718448 : FromChars::from_chars_result result{};
83 : if constexpr (std::is_same_v<T, int>) {
84 138160 : result = FromChars::from_chars(input.data(), input.data() + input.size(), param);
85 : } else if constexpr (std::is_same_v<T, double>) {
86 580288 : auto fast_float_result = fast_float::from_chars(input.data(), input.data() + input.size(), param);
87 580288 : result.ptr = fast_float_result.ptr;
88 580288 : result.ec = fast_float_result.ec;
89 : }
90 718448 : if (result.ec == std::errc::result_out_of_range || result.ec == std::errc::invalid_argument) {
91 0 : return false;
92 : }
93 718448 : size_t pos = result.ptr - input.data();
94 718448 : index += (pos + first_comma + first_char);
95 718448 : return true;
96 : }
97 :
98 132 : template <typename Param> bool readListItem(std::istream &stream, Param &¶m)
99 : {
100 132 : if (stream.good()) {
101 124 : stream >> param;
102 124 : if (stream.good() && stream.peek() == ',') {
103 3 : stream.get(); // eat comma
104 : }
105 : } else {
106 : // the stream was not good, it was, perhaps EOF. So we need to
107 : // set the fail bit here to say that we ran out of string
108 : // and were unable to read the next bit of data
109 8 : stream.setstate(std::ios_base::failbit);
110 : }
111 :
112 132 : return !stream.fail();
113 : }
114 :
115 19 : template <typename Param> bool readItem(std::string_view input, Param &¶m)
116 : {
117 19 : auto stream = stringReader(input);
118 19 : stream >> param;
119 38 : return !stream.fail() && stream.eof();
120 19 : }
121 :
122 : inline auto nth_occurrence(std::string_view input_str, std::string_view search_str, std::size_t Nth)
123 : {
124 : if (Nth == 0) return std::string_view::npos;
125 : std::string_view::size_type pos = 0;
126 : size_t cnt{};
127 :
128 : do {
129 : pos = input_str.find(search_str, pos);
130 : if (pos == std::string_view::npos) {
131 : return std::string_view::npos;
132 : }
133 : ++cnt;
134 : ++pos;
135 : } while (cnt != Nth);
136 :
137 : return pos;
138 : }
139 :
140 : // Returns the position **after** the nth occurrence of the search_char, eg:
141 : // 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
142 82896 : inline auto nth_occurrence(std::string_view input_str, char const search_char, std::size_t Nth)
143 : {
144 82896 : if (Nth == 0) return std::string_view::npos;
145 82896 : std::string_view::size_type pos = 0;
146 82896 : size_t cnt{};
147 :
148 : do {
149 884224 : pos = input_str.find(search_char, pos);
150 884224 : if (pos == std::string_view::npos) {
151 0 : return std::string_view::npos;
152 : }
153 884224 : ++cnt;
154 884224 : ++pos;
155 884224 : } while (cnt != Nth);
156 :
157 82896 : return pos;
158 : }
159 :
160 55283 : template <typename... Param> bool readList(std::string_view input, Param &&... param)
161 : {
162 : if constexpr (std::conjunction_v<std::is_same<double &, Param>...> || std::conjunction_v<std::is_same<int &, Param>...>) {
163 55266 : size_t index = 0;
164 55266 : return ((readListItem(input, index, param)), ...);
165 : } else {
166 17 : auto reader = stringReader(input);
167 34 : return ((readListItem(reader, param)), ...);
168 17 : }
169 : }
170 :
171 : } // namespace EnergyPlus
172 :
173 : namespace ObjexxFCL {
174 : // since this is a slice (reference) we want to bind to temporaries
175 : // so we're going to allow that where the one provided by Array1S.hh does not
176 : template <typename T> std::istream &operator>>(std::istream &stream, Array1S<T> &&a)
177 : {
178 : // just pass on to the `&` version of this operator>>
179 : return stream >> a;
180 : }
181 : } // namespace ObjexxFCL
182 :
183 : #endif
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