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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 | |
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50 | /** |
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51 | * The type of the parsed token. |
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52 | */ |
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53 | enum cx_json_token_type { |
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54 | /** |
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55 | * No complete token parsed, yet. |
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56 | */ |
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57 | CX_JSON_NO_TOKEN, |
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58 | /** |
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59 | * The presumed token contains syntactical errors. |
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60 | */ |
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61 | CX_JSON_TOKEN_ERROR, |
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62 | /** |
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63 | * A "begin of array" '[' token. |
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64 | */ |
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65 | CX_JSON_TOKEN_BEGIN_ARRAY, |
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66 | /** |
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67 | * A "begin of object" '{' token. |
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68 | */ |
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69 | CX_JSON_TOKEN_BEGIN_OBJECT, |
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70 | /** |
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71 | * An "end of array" ']' token. |
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72 | */ |
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73 | CX_JSON_TOKEN_END_ARRAY, |
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74 | /** |
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75 | * An "end of object" '}' token. |
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76 | */ |
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77 | CX_JSON_TOKEN_END_OBJECT, |
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78 | /** |
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79 | * A colon ':' token separating names and values. |
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80 | */ |
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81 | CX_JSON_TOKEN_NAME_SEPARATOR, |
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82 | /** |
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83 | * A comma ',' token separating object entries or array elements. |
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84 | */ |
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85 | CX_JSON_TOKEN_VALUE_SEPARATOR, |
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86 | /** |
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87 | * A string token. |
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88 | */ |
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89 | CX_JSON_TOKEN_STRING, |
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90 | /** |
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91 | * A number token that can be represented as integer. |
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92 | */ |
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93 | CX_JSON_TOKEN_INTEGER, |
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94 | /** |
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95 | * A number token that cannot be represented as integer. |
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96 | */ |
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97 | CX_JSON_TOKEN_NUMBER, |
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98 | /** |
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99 | * A literal token. |
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100 | */ |
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101 | CX_JSON_TOKEN_LITERAL, |
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102 | /** |
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103 | * A white-space token. |
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104 | */ |
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105 | CX_JSON_TOKEN_SPACE |
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106 | }; |
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107 | |
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108 | /** |
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109 | * The type of some JSON value. |
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110 | */ |
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111 | enum cx_json_value_type { |
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112 | /** |
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113 | * Reserved. |
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114 | */ |
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115 | CX_JSON_NOTHING, // this allows us to always return non-NULL values |
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116 | /** |
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117 | * A JSON object. |
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118 | */ |
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119 | CX_JSON_OBJECT, |
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120 | /** |
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121 | * A JSON array. |
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122 | */ |
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123 | CX_JSON_ARRAY, |
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124 | /** |
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125 | * A string. |
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126 | */ |
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127 | CX_JSON_STRING, |
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128 | /** |
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129 | * A number that contains an integer. |
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130 | */ |
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131 | CX_JSON_INTEGER, |
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132 | /** |
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133 | * A number, not necessarily an integer. |
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134 | */ |
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135 | CX_JSON_NUMBER, |
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136 | /** |
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137 | * A literal (true, false, null). |
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138 | */ |
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139 | CX_JSON_LITERAL |
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140 | }; |
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141 | |
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142 | /** |
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143 | * JSON literal types. |
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144 | */ |
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145 | enum cx_json_literal { |
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146 | /** |
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147 | * The \c null literal. |
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148 | */ |
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149 | CX_JSON_NULL, |
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150 | /** |
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151 | * The \c true literal. |
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152 | */ |
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153 | CX_JSON_TRUE, |
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154 | /** |
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155 | * The \c false literal. |
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156 | */ |
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157 | CX_JSON_FALSE |
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158 | }; |
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159 | |
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160 | /** |
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161 | * Type alias for the token type enum. |
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162 | */ |
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163 | typedef enum cx_json_token_type CxJsonTokenType; |
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164 | /** |
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165 | * Type alias for the value type enum. |
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166 | */ |
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167 | typedef enum cx_json_value_type CxJsonValueType; |
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168 | |
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169 | /** |
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170 | * Type alias for the JSON parser interface. |
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171 | */ |
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172 | typedef struct cx_json_s CxJson; |
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173 | |
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174 | /** |
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175 | * Type alias for the token struct. |
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176 | */ |
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177 | typedef struct cx_json_token_s CxJsonToken; |
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178 | |
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179 | /** |
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180 | * Type alias for the JSON value struct. |
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181 | */ |
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182 | typedef struct cx_json_value_s CxJsonValue; |
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183 | |
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184 | /** |
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185 | * Type alias for the JSON array struct. |
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186 | */ |
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187 | typedef struct cx_json_array_s CxJsonArray; |
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188 | /** |
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189 | * Type alias for the JSON object struct. |
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190 | */ |
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191 | typedef struct cx_json_object_s CxJsonObject; |
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192 | /** |
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193 | * Type alias for a JSON string. |
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194 | */ |
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195 | typedef struct cx_mutstr_s CxJsonString; |
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196 | /** |
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197 | * Type alias for a number that can be represented as 64-bit signed integer. |
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198 | */ |
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199 | typedef int64_t CxJsonInteger; |
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200 | /** |
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201 | * Type alias for number that is not an integer. |
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202 | */ |
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203 | typedef double CxJsonNumber; |
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204 | /** |
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205 | * Type alias for a JSON literal. |
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206 | */ |
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207 | typedef enum cx_json_literal CxJsonLiteral; |
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208 | |
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209 | /** |
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210 | * Type alias for a key/value pair in a JSON object. |
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211 | */ |
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212 | typedef struct cx_json_obj_value_s CxJsonObjValue; |
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213 | |
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214 | /** |
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215 | * JSON array structure. |
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216 | */ |
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217 | struct cx_json_array_s { |
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218 | /** |
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219 | * The array data. |
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220 | */ |
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221 | CX_ARRAY_DECLARE(CxJsonValue*, array); |
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222 | }; |
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223 | |
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224 | /** |
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225 | * JSON object structure. |
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226 | */ |
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227 | struct cx_json_object_s { |
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228 | /** |
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229 | * The key/value entries. |
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230 | */ |
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231 | CX_ARRAY_DECLARE(CxJsonObjValue, values); |
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232 | }; |
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233 | |
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234 | /** |
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235 | * Structure for a key/value entry in a JSON object. |
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236 | */ |
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237 | struct cx_json_obj_value_s { |
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238 | /** |
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239 | * The key a.k.a. name of the value. |
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240 | */ |
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241 | char *name; |
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242 | /** |
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243 | * The value. |
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244 | */ |
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245 | CxJsonValue *value; |
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246 | }; |
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247 | |
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248 | /** |
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249 | * Structure for a JSON value. |
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250 | */ |
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251 | struct cx_json_value_s { |
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252 | /** |
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253 | * The allocator with which the value was allocated. |
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254 | * |
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255 | * Required for recursively deallocating memory of objects and arrays. |
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256 | */ |
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257 | const CxAllocator *allocator; |
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258 | /** |
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259 | * The type of this value. |
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260 | * |
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261 | * Specifies how the \c value union shall be resolved. |
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262 | */ |
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263 | CxJsonValueType type; |
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264 | /** |
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265 | * The value data. |
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266 | */ |
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267 | union { |
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268 | /** |
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269 | * The array data if type is #CX_JSON_ARRAY. |
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270 | */ |
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271 | CxJsonArray array; |
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272 | /** |
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273 | * The object data if type is #CX_JSON_OBJECT. |
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274 | */ |
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275 | CxJsonObject object; |
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276 | /** |
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277 | * The string data if type is #CX_JSON_STRING. |
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278 | */ |
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279 | CxJsonString string; |
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280 | /** |
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281 | * The integer if type is #CX_JSON_INTEGER. |
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282 | */ |
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283 | CxJsonInteger integer; |
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284 | /** |
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285 | * The number if type is #CX_JSON_NUMBER. |
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286 | */ |
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287 | CxJsonNumber number; |
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288 | /** |
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289 | * The literal type if type is #CX_JSON_LITERAL. |
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290 | */ |
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291 | CxJsonLiteral literal; |
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292 | } value; |
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293 | }; |
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294 | |
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295 | /** |
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296 | * Structure for a parsed token. |
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297 | */ |
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298 | struct cx_json_token_s { |
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299 | /** |
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300 | * The token type. |
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301 | */ |
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302 | CxJsonTokenType tokentype; |
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303 | /** |
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304 | * True, iff the \c content must be passed to cx_strfree(). |
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305 | */ |
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306 | bool allocated; |
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307 | /** |
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308 | * The token text, if any. |
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309 | * |
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310 | * This is not necessarily set when the token type already |
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311 | * uniquely identifies the content. |
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312 | */ |
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313 | cxmutstr content; |
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314 | }; |
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315 | |
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316 | /** |
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317 | * The JSON parser interface. |
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318 | */ |
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319 | struct cx_json_s { |
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320 | /** |
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321 | * The allocator used for produced JSON values. |
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322 | */ |
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323 | const CxAllocator *allocator; |
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324 | /** |
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325 | * The input buffer. |
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326 | */ |
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327 | CxBuffer buffer; |
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328 | |
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329 | /** |
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330 | * Used internally. |
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331 | * |
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332 | * Remembers the prefix of the last uncompleted token. |
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333 | */ |
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334 | CxJsonToken uncompleted; |
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335 | |
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336 | /** |
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337 | * A pointer to an intermediate state of the currently parsed value. |
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338 | * |
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339 | * Never access this value manually. |
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340 | */ |
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341 | CxJsonValue *parsed; |
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342 | |
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343 | /** |
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344 | * State stack. |
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345 | */ |
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346 | CX_ARRAY_DECLARE_SIZED(int, states, unsigned); |
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347 | |
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348 | /** |
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349 | * Value buffer stack. |
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350 | */ |
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351 | CX_ARRAY_DECLARE_SIZED(CxJsonValue*, vbuf, unsigned); |
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352 | |
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353 | /** |
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354 | * Internally reserved memory for the state stack. |
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355 | */ |
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356 | int states_internal[8]; |
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357 | |
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358 | /** |
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359 | * Internally reserved memory for the value buffer stack. |
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360 | */ |
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361 | CxJsonValue* vbuf_internal[8]; |
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362 | |
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363 | /** |
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364 | * Used internally. |
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365 | */ |
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366 | bool tokenizer_escape; // TODO: check if it can be replaced with look-behind |
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367 | }; |
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368 | |
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369 | /** |
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370 | * Status codes for the json interface. |
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371 | */ |
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372 | enum cx_json_status { |
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373 | /** |
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374 | * Everything is fine. |
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375 | */ |
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376 | CX_JSON_NO_ERROR, |
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377 | /** |
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378 | * The input buffer does not contain more data. |
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379 | */ |
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380 | CX_JSON_NO_DATA, |
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381 | /** |
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382 | * The input ends unexpectedly. |
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383 | * |
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384 | * Refill the buffer with cxJsonFill() to complete the json data. |
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385 | */ |
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386 | CX_JSON_INCOMPLETE_DATA, |
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387 | /** |
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388 | * Not used as a status and never returned by any function. |
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389 | * |
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390 | * You can use this enumerator to check for all "good" status results |
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391 | * by checking if the status is less than \c CX_JSON_OK. |
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392 | * |
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393 | * A "good" status means, that you can refill data and continue parsing. |
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394 | */ |
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395 | CX_JSON_OK, |
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396 | /** |
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397 | * Allocating memory for the internal buffer failed. |
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398 | */ |
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399 | CX_JSON_BUFFER_ALLOC_FAILED, |
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400 | /** |
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401 | * Allocating memory for a json value failed. |
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402 | */ |
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403 | CX_JSON_VALUE_ALLOC_FAILED, |
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404 | /** |
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405 | * A number value is incorrectly formatted. |
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406 | */ |
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407 | CX_JSON_FORMAT_ERROR_NUMBER, |
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408 | /** |
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409 | * The tokenizer found something unexpected. |
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410 | */ |
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411 | CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN |
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412 | }; |
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413 | |
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414 | /** |
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415 | * Typedef for the json status enum. |
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416 | */ |
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417 | typedef enum cx_json_status CxJsonStatus; |
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418 | |
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419 | /** |
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420 | * Initializes the json interface. |
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421 | * |
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422 | * @param json the json interface |
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423 | * @param allocator the allocator that shall be used for the produced values |
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424 | * @see cxJsonDestroy() |
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425 | */ |
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426 | cx_attr_nonnull_arg(1) |
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427 | void cxJsonInit(CxJson *json, const CxAllocator *allocator); |
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428 | |
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429 | /** |
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430 | * Destroys the json interface. |
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431 | * |
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432 | * @param json the json interface |
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433 | * @see cxJsonInit() |
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434 | */ |
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435 | cx_attr_nonnull |
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436 | void cxJsonDestroy(CxJson *json); |
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437 | |
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438 | /** |
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439 | * Destroys and re-initializes the json interface. |
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440 | * |
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441 | * You might want to use this, to reset the parser after |
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442 | * encountering a syntax error. |
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443 | * |
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444 | * @param json the json interface |
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445 | */ |
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446 | cx_attr_nonnull |
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447 | static inline void cxJsonReset(CxJson *json) { |
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448 | const CxAllocator *allocator = json->allocator; |
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449 | cxJsonDestroy(json); |
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450 | cxJsonInit(json, allocator); |
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451 | } |
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452 | |
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453 | /** |
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454 | * Adds more data to the input buffer. |
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455 | * |
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456 | * The data will be copied. |
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457 | * |
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458 | * @param json the json interface |
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459 | * @param buf the source buffer |
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460 | * @param len the length of the source buffer |
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461 | * @return zero on success, non-zero on internal allocation error |
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462 | * @see cxJsonFill() |
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463 | */ |
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464 | cx_attr_nonnull |
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465 | cx_attr_access_r(2, 3) |
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466 | int cxJsonFilln(CxJson *json, const char *buf, size_t len); |
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467 | |
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468 | #ifdef __cplusplus |
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469 | } // extern "C" |
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470 | |
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471 | /** |
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472 | * Adds more data to the input buffer. |
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473 | * |
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474 | * The data will be copied. |
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475 | * |
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476 | * @param json the json interface |
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477 | * @param str the string to add to the buffer |
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478 | * @return zero on success, non-zero on internal allocation error |
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479 | * @see cxJsonFilln() |
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480 | */ |
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481 | cx_attr_nonnull |
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482 | static inline int cxJsonFill( |
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483 | CxJson *json, |
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484 | cxstring str |
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485 | ) { |
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486 | return cxJsonFilln(json, str.ptr, str.length); |
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487 | } |
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488 | |
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489 | /** |
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490 | * Adds more data to the input buffer. |
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491 | * |
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492 | * The data will be copied. |
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493 | * |
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494 | * @param json the json interface |
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495 | * @param str the string to add to the buffer |
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496 | * @return zero on success, non-zero on internal allocation error |
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497 | * @see cxJsonFilln() |
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498 | */ |
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499 | cx_attr_nonnull |
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500 | static inline int cxJsonFill( |
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501 | CxJson *json, |
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502 | cxmutstr str |
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503 | ) { |
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504 | return cxJsonFilln(json, str.ptr, str.length); |
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505 | } |
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506 | |
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507 | /** |
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508 | * Adds more data to the input buffer. |
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509 | * |
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510 | * The data will be copied. |
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511 | * |
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512 | * @param json the json interface |
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513 | * @param str the string to add to the buffer |
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514 | * @return zero on success, non-zero on internal allocation error |
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515 | * @see cxJsonFilln() |
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516 | */ |
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517 | cx_attr_nonnull |
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518 | cx_attr_cstr_arg(2) |
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519 | static inline int cxJsonFill( |
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520 | CxJson *json, |
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521 | const char *str |
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522 | ) { |
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523 | return cxJsonFilln(json, str, strlen(str)); |
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524 | } |
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525 | |
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526 | extern "C" { |
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527 | #else // __cplusplus |
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528 | /** |
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529 | * Adds more data to the input buffer. |
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530 | * |
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531 | * The data will be copied. |
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532 | * |
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533 | * @param json the json interface |
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534 | * @param str the string to add to the buffer |
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535 | * @return zero on success, non-zero on internal allocation error |
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536 | * @see cxJsonFilln() |
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537 | */ |
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538 | #define cxJsonFill(json, str) _Generic((str), \ |
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539 | cxstring: cx_json_fill_cxstr, \ |
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540 | cxmutstr: cx_json_fill_mutstr, \ |
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541 | char*: cx_json_fill_str, \ |
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542 | const char*: cx_json_fill_str) \ |
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543 | (json, str) |
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544 | |
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545 | /** |
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546 | * Adds more data to the input buffer. |
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547 | * |
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548 | * Internal function - please use the #cxJsonFill() macro. |
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549 | * |
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550 | * @param json the json interface |
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551 | * @param str the string to add to the buffer |
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552 | * @return zero on success, non-zero on internal allocation error |
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553 | * @see cxJsonFill() |
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554 | */ |
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555 | cx_attr_nonnull |
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556 | static inline int cx_json_fill_cxstr( |
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557 | CxJson *json, |
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558 | cxstring str |
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559 | ) { |
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560 | return cxJsonFilln(json, str.ptr, str.length); |
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561 | } |
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562 | |
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563 | /** |
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564 | * Adds more data to the input buffer. |
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565 | * |
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566 | * Internal function - please use the #cxJsonFill() macro. |
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567 | * |
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568 | * @param json the json interface |
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569 | * @param str the string to add to the buffer |
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570 | * @return zero on success, non-zero on internal allocation error |
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571 | * @see cxJsonFill() |
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572 | */ |
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573 | cx_attr_nonnull |
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574 | static inline int cx_json_fill_mutstr( |
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575 | CxJson *json, |
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576 | cxmutstr str |
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577 | ) { |
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578 | return cxJsonFilln(json, str.ptr, str.length); |
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579 | } |
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580 | |
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581 | /** |
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582 | * Adds more data to the input buffer. |
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583 | * |
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584 | * Internal function - please use the #cxJsonFill() macro. |
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585 | * |
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586 | * @param json the json interface |
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587 | * @param str the string to add to the buffer |
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588 | * @return zero on success, non-zero on internal allocation error |
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589 | * @see cxJsonFill() |
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590 | */ |
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591 | cx_attr_nonnull |
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592 | cx_attr_cstr_arg(2) |
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593 | static inline int cx_json_fill_str( |
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594 | CxJson *json, |
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595 | const char *str |
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596 | ) { |
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597 | return cxJsonFilln(json, str, strlen(str)); |
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598 | } |
988
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599 | #endif |
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600 | |
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601 | /** |
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602 | * Recursively deallocates the memory of a JSON value. |
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603 | * |
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604 | * \remark The type of each deallocated value will be changed |
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605 | * to #CX_JSON_NOTHING and values of such type will be skipped |
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606 | * by the de-allocation. That means, this function protects |
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607 | * you from double-frees when you are accidentally freeing |
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608 | * a nested value and then the parent value (or vice versa). |
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609 | * |
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610 | * @param value the value |
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611 | */ |
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612 | void cxJsonValueFree(CxJsonValue *value); |
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613 | |
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614 | /** |
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615 | * Tries to obtain the next JSON value. |
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616 | * |
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617 | * |
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618 | * @param json the json interface |
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619 | * @param value a pointer where the next value shall be stored |
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620 | * @return a status code |
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621 | */ |
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622 | cx_attr_nonnull |
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623 | cx_attr_access_w(2) |
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624 | CxJsonStatus cxJsonNext(CxJson *json, CxJsonValue **value); |
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625 | |
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626 | /** |
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627 | * Checks if the specified value is a JSON object. |
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628 | * |
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629 | * @param value a pointer to the value |
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630 | * @return true if the value is a JSON object, false otherwise |
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631 | */ |
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632 | cx_attr_nonnull |
1009 | 633 | static inline bool cxJsonIsObject(const CxJsonValue *value) { |
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634 | return value->type == CX_JSON_OBJECT; |
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635 | } |
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636 | |
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637 | /** |
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638 | * Checks if the specified value is a JSON array. |
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639 | * |
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640 | * @param value a pointer to the value |
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641 | * @return true if the value is a JSON array, false otherwise |
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642 | */ |
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643 | cx_attr_nonnull |
1009 | 644 | static inline bool cxJsonIsArray(const CxJsonValue *value) { |
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645 | return value->type == CX_JSON_ARRAY; |
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646 | } |
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647 | |
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648 | /** |
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649 | * Checks if the specified value is a string. |
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650 | * |
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651 | * @param value a pointer to the value |
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652 | * @return true if the value is a string, false otherwise |
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653 | */ |
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654 | cx_attr_nonnull |
1009 | 655 | static inline bool cxJsonIsString(const CxJsonValue *value) { |
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656 | return value->type == CX_JSON_STRING; |
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657 | } |
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658 | |
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659 | /** |
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660 | * Checks if the specified value is a JSON number. |
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661 | * |
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662 | * This function will return true for both floating point and |
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663 | * integer numbers. |
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664 | * |
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665 | * @param value a pointer to the value |
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666 | * @return true if the value is a JSON number, false otherwise |
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667 | * @see cxJsonIsInteger() |
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668 | */ |
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669 | cx_attr_nonnull |
1009 | 670 | static inline bool cxJsonIsNumber(const CxJsonValue *value) { |
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671 | return value->type == CX_JSON_NUMBER || value->type == CX_JSON_INTEGER; |
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672 | } |
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673 | |
1012
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674 | /** |
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675 | * Checks if the specified value is an integer number. |
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676 | * |
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677 | * @param value a pointer to the value |
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678 | * @return true if the value is an integer number, false otherwise |
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679 | * @see cxJsonIsNumber() |
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680 | */ |
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681 | cx_attr_nonnull |
1009 | 682 | static inline bool cxJsonIsInteger(const CxJsonValue *value) { |
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683 | return value->type == CX_JSON_INTEGER; |
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684 | } |
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685 | |
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686 | /** |
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687 | * Checks if the specified value is a JSON literal. |
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688 | * |
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689 | * JSON literals are \c true, \c false, and \c null. |
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690 | * |
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691 | * @param value a pointer to the value |
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692 | * @return true if the value is a JSON literal, false otherwise |
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693 | * @see cxJsonIsTrue() |
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694 | * @see cxJsonIsFalse() |
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695 | * @see cxJsonIsNull() |
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696 | */ |
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697 | cx_attr_nonnull |
1009 | 698 | static inline bool cxJsonIsLiteral(const CxJsonValue *value) { |
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699 | return value->type == CX_JSON_LITERAL; |
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700 | } |
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701 | |
1012
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702 | /** |
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703 | * Checks if the specified value is a Boolean literal. |
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704 | * |
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705 | * @param value a pointer to the value |
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706 | * @return true if the value is either \c true or \c false, false otherwise |
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707 | * @see cxJsonIsTrue() |
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708 | * @see cxJsonIsFalse() |
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709 | */ |
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710 | cx_attr_nonnull |
1009 | 711 | static inline bool cxJsonIsBool(const CxJsonValue *value) { |
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712 | return cxJsonIsLiteral(value) && value->value.literal != CX_JSON_NULL; |
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713 | } |
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714 | |
1012
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715 | /** |
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716 | * Checks if the specified value is \c true. |
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717 | * |
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718 | * \remark Be advised, that this is not the same as |
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719 | * testing \c !cxJsonIsFalse(v). |
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720 | * |
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721 | * @param value a pointer to the value |
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722 | * @return true if the value is \c true, false otherwise |
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723 | * @see cxJsonIsBool() |
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724 | * @see cxJsonIsFalse() |
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725 | */ |
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726 | cx_attr_nonnull |
1009 | 727 | static inline bool cxJsonIsTrue(const CxJsonValue *value) { |
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728 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_TRUE; |
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729 | } |
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730 | |
1012
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731 | /** |
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732 | * Checks if the specified value is \c false. |
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733 | * |
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734 | * \remark Be advised, that this is not the same as |
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735 | * testing \c !cxJsonIsTrue(v). |
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736 | * |
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737 | * @param value a pointer to the value |
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738 | * @return true if the value is \c false, false otherwise |
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739 | * @see cxJsonIsBool() |
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740 | * @see cxJsonIsTrue() |
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741 | */ |
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742 | cx_attr_nonnull |
1009 | 743 | static inline bool cxJsonIsFalse(const CxJsonValue *value) { |
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744 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_FALSE; |
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745 | } |
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746 | |
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747 | /** |
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748 | * Checks if the specified value is \c null. |
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749 | * |
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750 | * @param value a pointer to the value |
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751 | * @return true if the value is \c null, false otherwise |
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752 | * @see cxJsonIsLiteral() |
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753 | */ |
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754 | cx_attr_nonnull |
1009 | 755 | static inline bool cxJsonIsNull(const CxJsonValue *value) { |
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756 | return cxJsonIsLiteral(value) && value->value.literal == CX_JSON_NULL; |
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757 | } |
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758 | |
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759 | /** |
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760 | * Obtains a C string from the given JSON value. |
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761 | * |
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762 | * If the value is not a string, the behavior is undefined. |
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763 | * |
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764 | * @param value the JSON value |
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765 | * @return the value represented as C string |
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766 | * @see cxJsonIsString() |
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767 | */ |
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768 | cx_attr_nonnull |
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769 | cx_attr_returns_nonnull |
1009 | 770 | static inline char *cxJsonAsString(const CxJsonValue *value) { |
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771 | return value->value.string.ptr; |
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772 | } |
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773 | |
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774 | /** |
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775 | * Obtains a UCX string from the given JSON value. |
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776 | * |
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777 | * If the value is not a string, the behavior is undefined. |
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778 | * |
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779 | * @param value the JSON value |
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780 | * @return the value represented as UCX string |
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781 | * @see cxJsonIsString() |
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782 | */ |
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783 | cx_attr_nonnull |
1009 | 784 | static inline cxstring cxJsonAsCxString(const CxJsonValue *value) { |
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785 | return cx_strcast(value->value.string); |
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786 | } |
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787 | |
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788 | /** |
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789 | * Obtains a mutable UCX string from the given JSON value. |
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790 | * |
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791 | * If the value is not a string, the behavior is undefined. |
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792 | * |
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793 | * @param value the JSON value |
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794 | * @return the value represented as mutable UCX string |
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795 | * @see cxJsonIsString() |
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796 | */ |
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797 | cx_attr_nonnull |
1009 | 798 | static inline cxmutstr cxJsonAsCxMutStr(const CxJsonValue *value) { |
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799 | return value->value.string; |
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800 | } |
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801 | |
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802 | /** |
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803 | * Obtains a double-precision floating point value from the given JSON value. |
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804 | * |
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805 | * If the value is not a JSON number, the behavior is undefined. |
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806 | * |
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807 | * @param value the JSON value |
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808 | * @return the value represented as double |
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809 | * @see cxJsonIsNumber() |
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810 | */ |
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811 | cx_attr_nonnull |
1009 | 812 | static inline double cxJsonAsDouble(const CxJsonValue *value) { |
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813 | if (value->type == CX_JSON_INTEGER) { |
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814 | return (double) value->value.integer; |
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815 | } else { |
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816 | return value->value.number; |
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817 | } |
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818 | } |
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819 | |
1012
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820 | /** |
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821 | * Obtains a 64-bit signed integer from the given JSON value. |
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822 | * |
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823 | * If the value is not a JSON number, the behavior is undefined. |
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824 | * If it is a JSON number, but not an integer, the value will be |
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825 | * converted to an integer, possibly losing precision. |
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826 | * |
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827 | * @param value the JSON value |
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828 | * @return the value represented as double |
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829 | * @see cxJsonIsNumber() |
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830 | * @see cxJsonIsInteger() |
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831 | */ |
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832 | cx_attr_nonnull |
1009 | 833 | static inline int64_t cxJsonAsInteger(const CxJsonValue *value) { |
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834 | if (value->type == CX_JSON_INTEGER) { |
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835 | return value->value.integer; |
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836 | } else { |
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837 | return (int64_t) value->value.number; |
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838 | } |
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839 | } |
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840 | |
1012
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841 | /** |
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842 | * Obtains a Boolean value from the given JSON value. |
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843 | * |
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844 | * If the value is not a JSON literal, the behavior is undefined. |
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845 | * The \c null literal is interpreted as \c false. |
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846 | * |
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847 | * @param value the JSON value |
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848 | * @return the value represented as double |
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849 | * @see cxJsonIsLiteral() |
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850 | */ |
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851 | cx_attr_nonnull |
1009 | 852 | static inline bool cxJsonAsBool(const CxJsonValue *value) { |
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853 | return value->value.literal == CX_JSON_TRUE; |
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854 | } |
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855 | |
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856 | /** |
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857 | * Returns the size of a JSON array. |
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858 | * |
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859 | * If the value is not a JSON array, the behavior is undefined. |
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860 | * |
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861 | * @param value the JSON value |
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862 | * @return the size of the array |
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863 | * @see cxJsonIsArray() |
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864 | */ |
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865 | cx_attr_nonnull |
1009 | 866 | static inline size_t cxJsonArrSize(const CxJsonValue *value) { |
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867 | return value->value.array.array_size; |
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868 | } |
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869 | |
1012
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870 | /** |
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871 | * Returns an element from a JSON array. |
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872 | * |
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873 | * If the value is not a JSON array, the behavior is undefined. |
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874 | * |
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875 | * This function guarantees to return a value. If the index is |
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876 | * out of bounds, the returned value will be of type |
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877 | * #CX_JSON_NOTHING, but never \c NULL. |
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878 | * |
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879 | * @param value the JSON value |
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880 | * @param index the index in the array |
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881 | * @return the value at the specified index |
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882 | * @see cxJsonIsArray() |
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883 | */ |
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884 | cx_attr_nonnull |
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885 | cx_attr_returns_nonnull |
1009 | 886 | CxJsonValue *cxJsonArrGet(const CxJsonValue *value, size_t index); |
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887 | |
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888 | /** |
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889 | * Returns a value corresponding to a key in a JSON object. |
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890 | * |
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891 | * If the value is not a JSON object, the behavior is undefined. |
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892 | * |
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893 | * This function guarantees to return a JSON value. If the |
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894 | * object does not contain \p name, the returned JSON value |
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895 | * will be of type #CX_JSON_NOTHING, but never \c NULL. |
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896 | * |
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897 | * @param value the JSON object |
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898 | * @param name the key to look up |
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899 | * @return the value corresponding to the key |
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900 | * @see cxJsonIsObject() |
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901 | */ |
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902 | cx_attr_nonnull |
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903 | cx_attr_returns_nonnull |
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904 | cx_attr_cstr_arg(2) |
1009 | 905 | CxJsonValue *cxJsonObjGet(const CxJsonValue *value, const char* name); |
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906 | |
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907 | #ifdef __cplusplus |
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908 | } |
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909 | #endif |
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910 | |
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911 | #endif /* UCX_JSON_H */ |
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912 |