src/cx/json.h

7 days ago

author
Mike Becker <universe@uap-core.de>
date
Sun, 15 Dec 2024 11:11:16 +0100 (7 days ago)
changeset 1011
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parent 1009
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child 1012
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permissions
-rw-r--r--

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 }
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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)
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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

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