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and changelog entry for issue #523
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | /** |
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29 | * \file json.h |
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30 | * \brief Interface for parsing data from JSON files. |
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31 | * \author Mike Becker |
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32 | * \author Olaf Wintermann |
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33 | * \copyright 2-Clause BSD License |
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34 | */ |
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35 | |
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36 | #ifndef UCX_JSON_H |
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37 | #define UCX_JSON_H |
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38 | |
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39 | #include "common.h" |
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40 | #include "allocator.h" |
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41 | #include "string.h" |
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42 | #include "buffer.h" |
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43 | #include "array_list.h" |
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44 | |
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45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |
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49 | enum cx_json_token_type { |
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50 | CX_JSON_NO_TOKEN, |
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51 | CX_JSON_TOKEN_ERROR, |
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52 | CX_JSON_TOKEN_BEGIN_ARRAY, |
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53 | CX_JSON_TOKEN_BEGIN_OBJECT, |
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54 | CX_JSON_TOKEN_END_ARRAY, |
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55 | CX_JSON_TOKEN_END_OBJECT, |
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56 | CX_JSON_TOKEN_NAME_SEPARATOR, |
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57 | CX_JSON_TOKEN_VALUE_SEPARATOR, |
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58 | CX_JSON_TOKEN_STRING, |
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59 | CX_JSON_TOKEN_INTEGER, |
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60 | CX_JSON_TOKEN_NUMBER, |
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61 | CX_JSON_TOKEN_LITERAL, |
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62 | CX_JSON_TOKEN_SPACE |
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63 | }; |
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64 | |
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65 | enum cx_json_value_type { |
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66 | CX_JSON_NOTHING, // this allows us to always return non-NULL values |
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67 | CX_JSON_OBJECT, |
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68 | CX_JSON_ARRAY, |
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69 | CX_JSON_STRING, |
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70 | CX_JSON_INTEGER, |
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71 | CX_JSON_NUMBER, |
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72 | CX_JSON_LITERAL |
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73 | }; |
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74 | |
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75 | enum cx_json_literal { |
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76 | CX_JSON_NULL, |
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77 | CX_JSON_TRUE, |
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78 | CX_JSON_FALSE |
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79 | }; |
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80 | |
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81 | typedef enum cx_json_token_type CxJsonTokenType; |
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82 | typedef enum cx_json_value_type CxJsonValueType; |
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83 | |
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84 | typedef struct cx_json_s CxJson; |
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85 | typedef struct cx_json_token_s CxJsonToken; |
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86 | |
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87 | typedef struct cx_json_value_s CxJsonValue; |
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88 | |
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89 | typedef struct cx_json_array_s CxJsonArray; |
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90 | typedef struct cx_json_object_s CxJsonObject; |
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91 | typedef struct cx_mutstr_s CxJsonString; |
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92 | typedef int64_t CxJsonInteger; |
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93 | typedef double CxJsonNumber; |
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94 | typedef enum cx_json_literal CxJsonLiteral; |
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95 | |
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96 | typedef struct cx_json_obj_value_s CxJsonObjValue; |
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97 | |
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98 | |
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99 | struct cx_json_array_s { |
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100 | CX_ARRAY_DECLARE(CxJsonValue*, array); |
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101 | }; |
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102 | |
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103 | struct cx_json_object_s { |
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104 | CX_ARRAY_DECLARE(CxJsonObjValue, values); |
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105 | }; |
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106 | |
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107 | struct cx_json_obj_value_s { |
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108 | char *name; |
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109 | CxJsonValue *value; |
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110 | }; |
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111 | |
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112 | struct cx_json_value_s { |
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113 | const CxAllocator *allocator; |
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114 | CxJsonValueType type; |
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115 | union { |
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116 | CxJsonArray array; |
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117 | CxJsonObject object; |
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118 | CxJsonString string; |
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119 | CxJsonInteger integer; |
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120 | CxJsonNumber number; |
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121 | CxJsonLiteral literal; |
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122 | } value; |
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123 | }; |
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124 | |
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125 | struct cx_json_token_s { |
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126 | CxJsonTokenType tokentype; |
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127 | bool allocated; |
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128 | cxmutstr content; |
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129 | }; |
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130 | |
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131 | struct cx_json_s { |
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132 | const CxAllocator *allocator; |
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133 | CxBuffer buffer; |
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134 | |
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135 | CxJsonToken uncompleted; |
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136 | |
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137 | /** |
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138 | * A pointer to an intermediate state of the currently parsed value. |
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139 | * |
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140 | * Never access this value manually. |
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141 | */ |
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142 | CxJsonValue *parsed; |
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143 | |
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144 | /** |
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145 | * State stack. |
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146 | */ |
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147 | CX_ARRAY_DECLARE_SIZED(int, states, unsigned); |
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148 | |
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149 | /** |
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150 | * Value buffer stack. |
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151 | */ |
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152 | CX_ARRAY_DECLARE_SIZED(CxJsonValue*, vbuf, unsigned); |
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153 | |
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154 | /** |
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155 | * Internally reserved memory for the state stack. |
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156 | */ |
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157 | int states_internal[8]; |
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158 | |
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159 | /** |
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160 | * Internally reserved memory for the value buffer stack. |
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161 | */ |
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162 | CxJsonValue* vbuf_internal[8]; |
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163 | |
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164 | int error; // TODO: currently unused |
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165 | bool tokenizer_escape; // TODO: check if it can be replaced with look-behind |
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166 | }; |
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167 | |
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168 | /** |
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169 | * Status codes for the json interface. |
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170 | */ |
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171 | enum cx_json_status { |
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172 | /** |
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173 | * Everything is fine. |
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174 | */ |
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175 | CX_JSON_NO_ERROR, |
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176 | /** |
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177 | * The input buffer does not contain more data. |
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178 | */ |
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179 | CX_JSON_NO_DATA, |
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180 | /** |
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181 | * The input ends unexpectedly. |
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182 | * |
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183 | * Refill the buffer with cxJsonFill() to complete the json data. |
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184 | */ |
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185 | CX_JSON_INCOMPLETE_DATA, |
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186 | /** |
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187 | * Not used as a status and never returned by any function. |
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188 | * |
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189 | * You can use this enumerator to check for all "good" status results |
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190 | * by checking if the status is less than \c CX_JSON_OK. |
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191 | * |
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192 | * A "good" status means, that you can refill data and continue parsing. |
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193 | */ |
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194 | CX_JSON_OK, |
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195 | /** |
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196 | * Allocating memory for the internal buffer failed. |
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197 | */ |
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198 | CX_JSON_BUFFER_ALLOC_FAILED, |
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199 | /** |
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200 | * Allocating memory for a json value failed. |
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201 | */ |
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202 | CX_JSON_VALUE_ALLOC_FAILED, |
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203 | /** |
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204 | * A number value is incorrectly formatted. |
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205 | */ |
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206 | CX_JSON_FORMAT_ERROR_NUMBER, |
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207 | /** |
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208 | * The tokenizer found something unexpected. |
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209 | */ |
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210 | CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN |
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211 | }; |
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212 | |
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213 | /** |
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214 | * Typedef for the json status enum. |
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215 | */ |
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216 | typedef enum cx_json_status CxJsonStatus; |
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217 | |
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218 | cx_attr_nonnull_arg(1) |
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219 | void cxJsonInit(CxJson *json, const CxAllocator *allocator); |
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220 | |
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221 | cx_attr_nonnull |
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222 | void cxJsonDestroy(CxJson *json); |
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223 | |
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224 | cx_attr_nonnull |
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225 | cx_attr_access_r(2, 3) |
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226 | int cxJsonFilln(CxJson *json, const char *buf, size_t len); |
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227 | |
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228 | #ifdef __cplusplus |
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229 | } // extern "C" |
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230 | |
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231 | cx_attr_nonnull |
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232 | static inline int cxJsonFill( |
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233 | CxJson *json, |
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234 | cxstring str |
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235 | ) { |
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236 | return cxJsonFilln(json, str.ptr, str.length); |
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237 | } |
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238 | |
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239 | cx_attr_nonnull |
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240 | static inline int cxJsonFill( |
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241 | CxJson *json, |
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242 | cxmutstr str |
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243 | ) { |
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244 | return cxJsonFilln(json, str.ptr, str.length); |
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245 | } |
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246 | |
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247 | cx_attr_nonnull |
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248 | cx_attr_cstr_arg(2) |
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249 | static inline int cxJsonFill( |
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250 | CxJson *json, |
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251 | const char *str |
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252 | ) { |
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253 | return cxJsonFilln(json, str, strlen(str)); |
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254 | } |
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255 | |
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256 | extern "C" { |
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257 | #else // __cplusplus |
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258 | #define cxJsonFill(json, str) _Generic((str), \ |
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259 | cxstring: cx_json_fill_cxstr, \ |
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260 | cxmutstr: cx_json_fill_mutstr, \ |
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261 | char*: cx_json_fill_str, \ |
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262 | const char*: cx_json_fill_str) \ |
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263 | (json, str) |
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264 | |
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265 | cx_attr_nonnull |
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266 | static inline int cx_json_fill_cxstr( |
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267 | CxJson *json, |
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268 | cxstring str |
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269 | ) { |
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270 | return cxJsonFilln(json, str.ptr, str.length); |
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271 | } |
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272 | |
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273 | cx_attr_nonnull |
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274 | static inline int cx_json_fill_mutstr( |
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275 | CxJson *json, |
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276 | cxmutstr str |
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277 | ) { |
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278 | return cxJsonFilln(json, str.ptr, str.length); |
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279 | } |
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280 | |
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281 | cx_attr_nonnull |
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282 | cx_attr_cstr_arg(2) |
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283 | static inline int cx_json_fill_str( |
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284 | CxJson *json, |
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285 | const char *str |
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286 | ) { |
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287 | return cxJsonFilln(json, str, strlen(str)); |
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288 | } |
988
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289 | #endif |
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290 | |
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291 | void cxJsonValueFree(CxJsonValue *value); |
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292 | |
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293 | cx_attr_nonnull |
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294 | CxJsonStatus cxJsonNext(CxJson *json, CxJsonValue **value); |
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295 | |
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296 | cx_attr_nonnull |
1009 | 297 | static inline bool cxJsonIsObject(const CxJsonValue *value) { |
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298 | return value->type == CX_JSON_OBJECT; |
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299 | } |
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300 | |
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301 | cx_attr_nonnull |
1009 | 302 | static inline bool cxJsonIsArray(const CxJsonValue *value) { |
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303 | return value->type == CX_JSON_ARRAY; |
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304 | } |
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305 | |
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306 | cx_attr_nonnull |
1009 | 307 | static inline bool cxJsonIsString(const CxJsonValue *value) { |
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308 | return value->type == CX_JSON_STRING; |
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309 | } |
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310 | |
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311 | cx_attr_nonnull |
1009 | 312 | static inline bool cxJsonIsNumber(const CxJsonValue *value) { |
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313 | return value->type == CX_JSON_NUMBER || value->type == CX_JSON_INTEGER; |
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314 | } |
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315 | |
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316 | cx_attr_nonnull |
1009 | 317 | static inline bool cxJsonIsInteger(const CxJsonValue *value) { |
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318 | return value->type == CX_JSON_INTEGER; |
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319 | } |
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320 | |
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321 | cx_attr_nonnull |
1009 | 322 | static inline bool cxJsonIsLiteral(const CxJsonValue *value) { |
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323 | return value->type == CX_JSON_LITERAL; |
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324 | } |
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325 | |
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326 | cx_attr_nonnull |
1009 | 327 | static inline bool cxJsonIsBool(const CxJsonValue *value) { |
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328 | return cxJsonIsLiteral(value) && value->value.literal != CX_JSON_NULL; |
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329 | } |
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330 | |
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331 | cx_attr_nonnull |
1009 | 332 | static inline bool cxJsonIsTrue(const CxJsonValue *value) { |
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333 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_TRUE; |
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334 | } |
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335 | |
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336 | cx_attr_nonnull |
1009 | 337 | static inline bool cxJsonIsFalse(const CxJsonValue *value) { |
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338 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_FALSE; |
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339 | } |
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340 | |
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341 | cx_attr_nonnull |
1009 | 342 | static inline bool cxJsonIsNull(const CxJsonValue *value) { |
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343 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_NULL; |
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344 | } |
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345 | |
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346 | cx_attr_nonnull |
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347 | cx_attr_returns_nonnull |
1009 | 348 | static inline char *cxJsonAsString(const CxJsonValue *value) { |
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349 | return value->value.string.ptr; |
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350 | } |
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351 | |
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352 | cx_attr_nonnull |
1009 | 353 | static inline cxstring cxJsonAsCxString(const CxJsonValue *value) { |
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354 | return cx_strcast(value->value.string); |
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355 | } |
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356 | |
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357 | cx_attr_nonnull |
1009 | 358 | static inline cxmutstr cxJsonAsCxMutStr(const CxJsonValue *value) { |
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359 | return value->value.string; |
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360 | } |
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361 | |
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362 | cx_attr_nonnull |
1009 | 363 | static inline double cxJsonAsDouble(const CxJsonValue *value) { |
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364 | if (value->type == CX_JSON_INTEGER) { |
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365 | return (double) value->value.integer; |
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366 | } else { |
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367 | return value->value.number; |
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368 | } |
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369 | } |
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370 | |
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371 | cx_attr_nonnull |
1009 | 372 | static inline int64_t cxJsonAsInteger(const CxJsonValue *value) { |
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373 | if (value->type == CX_JSON_INTEGER) { |
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374 | return value->value.integer; |
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375 | } else { |
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376 | return (int64_t) value->value.number; |
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377 | } |
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378 | } |
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379 | |
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380 | cx_attr_nonnull |
1009 | 381 | static inline bool cxJsonAsBool(const CxJsonValue *value) { |
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382 | return value->value.literal == CX_JSON_TRUE; |
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383 | } |
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384 | |
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385 | cx_attr_nonnull |
1009 | 386 | static inline size_t cxJsonArrSize(const CxJsonValue *value) { |
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387 | return value->value.array.array_size; |
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388 | } |
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389 | |
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390 | cx_attr_nonnull |
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391 | cx_attr_returns_nonnull |
1009 | 392 | CxJsonValue *cxJsonArrGet(const CxJsonValue *value, size_t index); |
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393 | |
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394 | // TODO: add cxJsonArrIter() |
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395 | |
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396 | // TODO: implement cxJsonObjGet as a _Generic with support for cxstring |
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397 | cx_attr_nonnull |
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398 | cx_attr_returns_nonnull |
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399 | cx_attr_cstr_arg(2) |
1009 | 400 | CxJsonValue *cxJsonObjGet(const CxJsonValue *value, const char* name); |
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401 | |
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402 | #ifdef __cplusplus |
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403 | } |
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404 | #endif |
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405 | |
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406 | #endif /* UCX_JSON_H */ |
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407 |