Mercurial > code
annotate C++/modules/Json/Json.cpp @ 405:f81478065901
Json:
- Complete rewrite,
- Convert jansson tree to own C++ tree,
- Conversion from Value to Object/Array makes copies
| author | David Demelier <markand@malikania.fr> |
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| date | Mon, 05 Oct 2015 17:04:40 +0200 |
| parents | 9ab878fb9fa2 |
| children | d485d36a8de1 |
| rev | line source |
|---|---|
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1 /* |
| 405 | 2 * Json.cpp -- C++14 JSON manipulation using jansson parser |
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3 * |
| 403 | 4 * Copyright (c) 2013-2015 David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
| 405 | 19 #include "Json.h" |
| 314 | 20 |
| 405 | 21 #include <jansson.h> |
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22 |
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23 namespace json { |
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24 |
| 405 | 25 namespace { |
| 26 | |
| 27 void readObject(Value &parent, json_t *object); | |
| 28 void readArray(Value &parent, json_t *array); | |
| 29 | |
| 30 Value readValue(json_t *v) | |
| 31 { | |
| 32 if (json_is_null(v)) { | |
| 33 return Value{nullptr}; | |
| 34 } | |
| 35 if (json_is_string(v)) { | |
| 36 return Value{json_string_value(v)}; | |
| 37 } | |
| 38 if (json_is_number(v)) { | |
| 39 return Value{json_number_value(v)}; | |
| 40 } | |
| 41 if (json_is_boolean(v)) { | |
| 42 return Value{json_boolean_value(v)}; | |
| 43 } | |
| 44 if (json_is_object(v)) { | |
| 45 Object object; | |
| 46 | |
| 47 readObject(object, v); | |
| 48 | |
| 49 return object; | |
| 50 } | |
| 51 if (json_is_array(v)) { | |
| 52 Array array; | |
| 53 | |
| 54 readArray(array, v); | |
| 55 | |
| 56 return array; | |
| 57 } | |
| 58 | |
| 59 return Value{}; | |
| 60 } | |
| 61 | |
| 62 void readObject(Value &parent, json_t *object) | |
| 63 { | |
| 64 const char *key; | |
| 65 json_t *value; | |
| 66 | |
| 67 json_object_foreach(object, key, value) { | |
| 68 static_cast<Object &>(parent).insert(key, readValue(value)); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 void readArray(Value &parent, json_t *array) | |
| 73 { | |
| 74 size_t index; | |
| 75 json_t *value; | |
| 76 | |
| 77 json_array_foreach(array, index, value) { | |
| 78 static_cast<Array &>(parent).append(readValue(value)); | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 template <typename Func, typename... Args> | |
| 83 Value convert(Func fn, Args&&... args) | |
| 84 { | |
| 85 json_error_t error; | |
| 86 json_t *json = fn(std::forward<Args>(args)..., &error); | |
| 87 | |
| 88 if (json == nullptr) { | |
| 89 throw Error{error.text, error.source, error.line, error.column, error.position}; | |
| 90 } | |
| 91 | |
| 92 Value value; | |
| 93 | |
| 94 if (json_is_object(json)) { | |
| 95 value = Object{}; | |
| 96 readObject(value, json); | |
| 97 } else { | |
| 98 value = Array{}; | |
| 99 readArray(value, json); | |
| 100 } | |
| 101 | |
| 102 json_decref(json); | |
| 103 | |
| 104 return value; | |
| 105 } | |
| 106 | |
| 107 } // !namespace | |
| 108 | |
| 109 bool Value::toBool() const noexcept | |
| 110 { | |
| 111 if (m_type != Type::Boolean) | |
| 112 return false; | |
| 113 | |
| 114 return m_boolean; | |
| 115 } | |
| 116 | |
| 117 double Value::toNumber() const noexcept | |
| 118 { | |
| 119 if (m_type != Type::Number) | |
| 120 return 0; | |
| 121 | |
| 122 return m_number; | |
| 123 } | |
| 124 | |
| 125 std::string Value::toString() const noexcept | |
| 126 { | |
| 127 if (m_type != Type::String) { | |
| 128 return ""; | |
| 129 } | |
| 130 | |
| 131 return m_string; | |
| 132 } | |
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133 |
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134 Object Value::toObject() const noexcept |
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135 { |
| 405 | 136 if (m_type != Type::Object) { |
| 137 return Object{}; | |
| 138 } | |
| 311 | 139 |
| 405 | 140 return Object(*this); |
| 311 | 141 } |
| 142 | |
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143 Array Value::toArray() const noexcept |
| 311 | 144 { |
| 405 | 145 if (m_type != Type::Array) { |
| 146 return Array{}; | |
| 147 } | |
| 314 | 148 |
| 405 | 149 return Array(*this); |
| 311 | 150 } |
| 151 | |
| 405 | 152 Document::Document(Buffer buffer) |
| 311 | 153 { |
| 405 | 154 m_value = convert(json_loads, buffer.text.c_str(), 0); |
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155 } |
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156 |
| 405 | 157 Document::Document(File file) |
| 314 | 158 { |
| 405 | 159 m_value = convert(json_load_file, file.path.c_str(), 0); |
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160 } |
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161 |
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162 } // !json |