| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #ifdef __cpp_lib_ranges | ||
| 4 | #ifdef __cpp_lib_concepts | ||
| 5 | #include <concepts> | ||
| 6 | #include <ranges> | ||
| 7 | #define USE_RANGES | ||
| 8 | #endif | ||
| 9 | #endif | ||
| 10 | |||
| 11 | #include <array> | ||
| 12 | #include <string> | ||
| 13 | |||
| 14 | namespace text_conversion_constexpr | ||
| 15 | { | ||
| 16 | 2 | inline const char* version() | |
| 17 | { | ||
| 18 | 2 | return "0.1.3"; | |
| 19 | } | ||
| 20 | |||
| 21 | namespace intern | ||
| 22 | { | ||
| 23 | 549 | constexpr auto is_alpha(auto c) | |
| 24 | { | ||
| 25 |
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549 | return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); |
| 26 | } | ||
| 27 | |||
| 28 | 119 | constexpr auto is_lower(auto c) | |
| 29 | { | ||
| 30 |
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119 | return (c >= 'a' && c <= 'z'); |
| 31 | } | ||
| 32 | |||
| 33 | constexpr static auto uppercase = 'a' - 'A'; | ||
| 34 | |||
| 35 | } // namespace intern | ||
| 36 | |||
| 37 | /* | ||
| 38 | * Converts the given text to title case style. | ||
| 39 | * | ||
| 40 | * https://apastyle.apa.org/style-grammar-guidelines/capitalization/title-case | ||
| 41 | * | ||
| 42 | * @param[in,out] data The text to convert, modified in place. | ||
| 43 | * Must support character indexing and `size()`. | ||
| 44 | */ | ||
| 45 | template <typename DATA> | ||
| 46 | #ifdef USE_RANGES | ||
| 47 | requires std::ranges::sized_range<DATA> | ||
| 48 | #endif | ||
| 49 | 27 | constexpr void convert_to_title_case(DATA& data) | |
| 50 | { | ||
| 51 |
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27 | if (data.empty()) |
| 52 | ✗ | return; | |
| 53 | |||
| 54 | 549 | auto is_letter = [&](const auto& letter) | |
| 55 | { | ||
| 56 |
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549 | return intern::is_alpha(letter) || letter == '\''; |
| 57 | }; | ||
| 58 | |||
| 59 | 479 | auto make_upper_case = [&](auto offset) | |
| 60 | { | ||
| 61 | 119 | auto& letter = data[offset]; | |
| 62 | // check if lower case letter | ||
| 63 |
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119 | if (intern::is_lower(letter)) |
| 64 | 90 | letter -= intern::uppercase; | |
| 65 | }; | ||
| 66 | |||
| 67 | 109 | auto check_if_short_word = [&](const auto& word, const auto& short_words) | |
| 68 | { | ||
| 69 |
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109 | if (word.size() >= 4) |
| 70 | 68 | return false; | |
| 71 | |||
| 72 |
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636 | for (const auto& short_word : short_words) |
| 73 |
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612 | if (short_word == word) |
| 74 | 17 | return true; | |
| 75 | |||
| 76 | 24 | return false; | |
| 77 | }; | ||
| 78 | |||
| 79 | 27 | const std::array<std::string_view, 22> short_words{ | |
| 80 | "a", "an", "the", "and", "as", "but", "for", "if", | ||
| 81 | "nor", "or", "so", "yet", "at", "by", "in", "of", | ||
| 82 | "off", "on", "per", "to", "up", "via"}; | ||
| 83 | |||
| 84 | 27 | auto word_length = 0u; | |
| 85 | 27 | auto start_index = 0u; | |
| 86 | |||
| 87 | // first letter | ||
| 88 |
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27 | make_upper_case(0); |
| 89 | |||
| 90 | 27 | const auto size = data.size(); | |
| 91 | 27 | const auto last_letter_idx = size - 1u; | |
| 92 | |||
| 93 | 27 | auto first_word = true; | |
| 94 | |||
| 95 |
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576 | for (auto i = 0u; i < size; ++i) |
| 96 | { | ||
| 97 |
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549 | const auto letter = is_letter(data[i]); |
| 98 |
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549 | if (letter) |
| 99 | { | ||
| 100 |
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461 | if (word_length == 0u) |
| 101 | 108 | start_index = i; | |
| 102 | |||
| 103 | 461 | word_length++; | |
| 104 | } | ||
| 105 | |||
| 106 |
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549 | if ((!letter && word_length > 0u) || i == last_letter_idx) |
| 107 | { | ||
| 108 |
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109 | const std::string_view word(&data[start_index], word_length); |
| 109 | |||
| 110 | 109 | const auto to_upper = !check_if_short_word(word, short_words); | |
| 111 | |||
| 112 |
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109 | if (to_upper || first_word) |
| 113 |
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92 | make_upper_case(start_index); |
| 114 | |||
| 115 | 109 | word_length = 0u; | |
| 116 | 109 | first_word = false; | |
| 117 | } | ||
| 118 | } | ||
| 119 | } | ||
| 120 | |||
| 121 | } // namespace text_conversion_constexpr | ||
| 122 |