src/cx/json.h

Tue, 29 Oct 2024 18:46:50 +0100

author
Mike Becker <universe@uap-core.de>
date
Tue, 29 Oct 2024 18:46:50 +0100
changeset 955
18741059da47
parent 954
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permissions
-rw-r--r--

remove cx_swap_ptr()

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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 "string.h"
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41
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42 #ifdef __cplusplus
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43 extern "C" {
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44 #endif
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45
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46 enum cx_json_token_type {
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47 CX_JSON_NO_TOKEN,
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48 CX_JSON_TOKEN_ERROR,
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49 CX_JSON_TOKEN_BEGIN_ARRAY,
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50 CX_JSON_TOKEN_BEGIN_OBJECT,
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51 CX_JSON_TOKEN_END_ARRAY,
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52 CX_JSON_TOKEN_END_OBJECT,
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53 CX_JSON_TOKEN_NAME_SEPARATOR,
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54 CX_JSON_TOKEN_VALUE_SEPARATOR,
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55 CX_JSON_TOKEN_STRING,
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56 CX_JSON_TOKEN_INTEGER,
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57 CX_JSON_TOKEN_NUMBER,
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58 CX_JSON_TOKEN_LITERAL,
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59 CX_JSON_TOKEN_SPACE
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60 };
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61
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62 enum cx_json_value_type {
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63 CX_JSON_NOTHING, // this allows us to always return non-NULL values
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64 CX_JSON_OBJECT,
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65 CX_JSON_ARRAY,
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66 CX_JSON_STRING,
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67 CX_JSON_INTEGER, // TODO: the spec does not know integer types
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68 CX_JSON_NUMBER,
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69 CX_JSON_LITERAL
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70 };
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71
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72 enum cx_json_literal_type {
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73 CX_JSON_NULL,
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74 CX_JSON_TRUE,
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75 CX_JSON_FALSE
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76 };
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77
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78 enum cx_json_reader_type {
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79 CX_JSON_READER_OBJECT_BEGIN,
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80 CX_JSON_READER_OBJECT_END,
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81 CX_JSON_READER_ARRAY_BEGIN,
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82 CX_JSON_READER_ARRAY_END,
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83 CX_JSON_READER_STRING,
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84 CX_JSON_READER_INTEGER,
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85 CX_JSON_READER_NUMBER,
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86 CX_JSON_READER_LITERAL
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87 };
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88
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89 typedef enum cx_json_token_type CxJsonTokenType;
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90 typedef enum cx_json_value_type CxJsonValueType;
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91 typedef enum cx_json_literal_type CxJsonLiteralType;
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92 typedef enum cx_json_reader_type CxJsonReaderType;
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93
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94 typedef struct cx_json_s CxJson;
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95 typedef struct cx_json_token_s CxJsonToken;
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96
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97 typedef struct cx_json_value_s CxJsonValue;
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98
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99 typedef struct cx_json_array_s CxJsonArray;
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100 typedef struct cx_json_object_s CxJsonObject;
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101 typedef struct cx_mutstr_s CxJsonString;
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102 typedef struct cx_json_integer_s CxJsonInteger;
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103 typedef struct cx_json_number_s CxJsonNumber;
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104 typedef struct cx_json_literal_s CxJsonLiteral;
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105
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106 typedef struct cx_json_obj_value_s CxJsonObjValue;
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107
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108 struct cx_json_token_s {
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109 CxJsonTokenType tokentype;
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110 const char *content;
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111 size_t length;
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112 size_t alloc;
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113 };
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114
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115 struct cx_json_s {
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116 const char *buffer;
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117 size_t size;
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118 size_t pos;
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119
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120 CxJsonToken uncompleted;
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121 int tokenizer_escape;
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122
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123 int *states;
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124 size_t nstates;
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125 size_t states_alloc;
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126 int states_internal[8];
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127
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128 CxJsonToken reader_token;
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129 CxJsonReaderType reader_type;
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130 int value_ready;
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131 char *value_name;
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132 size_t value_name_len;
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133 char *value_str;
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134 size_t value_str_len;
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135 int64_t value_int;
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136 double value_double;
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137
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138 CxJsonValue **readvalue_stack;
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139 unsigned readvalue_nelm;
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140 unsigned readvalue_alloc;
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141 CxJsonValue *read_value;
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142 int readvalue_initialized;
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143
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144 unsigned reader_array_alloc;
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145
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146 int error;
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147 };
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148
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149 struct cx_json_array_s {
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150 CxJsonValue **array;
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151 size_t alloc;
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152 size_t size;
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153 };
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154
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155 struct cx_json_object_s {
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156 CxJsonObjValue *values;
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157 size_t alloc;
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158 size_t size;
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159 };
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160
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161 struct cx_json_obj_value_s {
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162 char *name;
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163 CxJsonValue *value;
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164 };
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165
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166 // TODO: remove single member structs
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167
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168 struct cx_json_integer_s {
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169 int64_t value;
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170 };
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171
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172 struct cx_json_number_s {
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173 double value;
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174 };
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175
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176 struct cx_json_literal_s {
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177 CxJsonLiteralType literal;
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178 };
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179
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180 struct cx_json_value_s {
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181 CxJsonValueType type;
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182 union {
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183 CxJsonArray array;
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184 CxJsonObject object;
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185 CxJsonString string;
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186 CxJsonInteger integer;
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187 CxJsonNumber number;
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188 CxJsonLiteral literal;
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189 } value;
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190 };
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191
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192 // TODO: add support for CxAllocator
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193
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194 __attribute__((__nonnull__))
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195 void cxJsonInit(CxJson *json);
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196
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197 __attribute__((__nonnull__))
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198 void cxJsonDestroy(CxJson *json);
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199
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200 __attribute__((__nonnull__))
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201 void cxJsonFill(CxJson *json, const char *buf, size_t len);
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202
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203 // TODO: discuss if it is intentional that cxJsonNext() will usually parse an entire file in one go
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204 __attribute__((__nonnull__))
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205 int cxJsonNext(CxJson *json, CxJsonValue **value);
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206
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207 void cxJsonValueFree(CxJsonValue *value);
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208
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209 __attribute__((__nonnull__))
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210 static inline bool cxJsonIsObject(CxJsonValue *value) {
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211 return value->type == CX_JSON_OBJECT;
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212 }
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213
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214 __attribute__((__nonnull__))
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215 static inline bool cxJsonIsArray(CxJsonValue *value) {
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216 return value->type == CX_JSON_ARRAY;
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217 }
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218
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219 __attribute__((__nonnull__))
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220 static inline bool cxJsonIsString(CxJsonValue *value) {
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221 return value->type == CX_JSON_STRING;
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222 }
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223
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224 __attribute__((__nonnull__))
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225 static inline bool cxJsonIsNumber(CxJsonValue *value) {
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226 // TODO: this is not good, because an integer is also a number
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227 return value->type == CX_JSON_NUMBER;
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228 }
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229
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230 __attribute__((__nonnull__))
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231 static inline bool cxJsonIsInteger(CxJsonValue *value) {
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232 return value->type == CX_JSON_INTEGER;
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233 }
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234
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235 __attribute__((__nonnull__))
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236 static inline bool cxJsonIsLiteral(CxJsonValue *value) {
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237 return value->type == CX_JSON_LITERAL;
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238 }
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239
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240 __attribute__((__nonnull__))
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241 static inline bool cxJsonIsBool(CxJsonValue *value) {
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242 return cxJsonIsLiteral(value) && value->value.literal.literal != CX_JSON_NULL;
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243 }
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244
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245 __attribute__((__nonnull__))
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246 static inline bool cxJsonIsTrue(CxJsonValue *value) {
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247 return cxJsonIsLiteral(value) && value->value.literal.literal == CX_JSON_TRUE;
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248 }
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249
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250 __attribute__((__nonnull__))
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251 static inline bool cxJsonIsFalse(CxJsonValue *value) {
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252 return cxJsonIsLiteral(value) && value->value.literal.literal == CX_JSON_FALSE;
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253 }
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254
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255 __attribute__((__nonnull__))
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256 static inline bool cxJsonIsNull(CxJsonValue *value) {
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257 return cxJsonIsLiteral(value) && value->value.literal.literal == CX_JSON_NULL;
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258 }
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259
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260 __attribute__((__nonnull__))
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261 static inline cxmutstr cxJsonAsString(CxJsonValue *value) {
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262 // TODO: do we need a separate method to return this directly as cxstring?
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263 return value->value.string;
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264 }
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265
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266 __attribute__((__nonnull__))
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267 static inline double cxJsonAsDouble(CxJsonValue *value) {
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268 return value->value.number.value;
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269 }
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270
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271 __attribute__((__nonnull__))
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272 static inline int64_t cxJsonAsInteger(CxJsonValue *value) {
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273 return value->value.integer.value;
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274 }
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275
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276 __attribute__((__nonnull__))
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277 static inline bool cxJsonAsBool(CxJsonValue *value) {
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278 return value->value.literal.literal == CX_JSON_TRUE;
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279 }
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280
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281 __attribute__((__nonnull__))
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282 static inline size_t cxJsonArrSize(CxJsonValue *value) {
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283 return value->value.array.size;
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284 }
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285
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286 __attribute__((__nonnull__, __returns_nonnull__))
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287 CxJsonValue *cxJsonArrGet(CxJsonValue *value, size_t index);
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288
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289 // TODO: add cxJsonArrIter()
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290
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291 // TODO: implement cxJsonObjGet as a _Generic with support for cxstring
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292 __attribute__((__nonnull__, __returns_nonnull__))
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293 CxJsonValue *cxJsonObjGet(CxJsonValue *value, const char* name);
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294
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295 #ifdef __cplusplus
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296 }
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297 #endif
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298
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diff changeset
299 #endif /* UCX_JSON_H */
10123f4d5618 add first draft of json implementation - relates to #431
Mike Becker <universe@uap-core.de>
parents:
diff changeset
300

mercurial