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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 | #include "cx/json.h" |
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30 | |
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31 | #include <string.h> |
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32 | #include <ctype.h> |
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33 | #include <assert.h> |
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34 | #include <stdio.h> |
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35 | #include <errno.h> |
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36 | |
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37 | /* |
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38 | * RFC 8259 |
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39 | * https://tools.ietf.org/html/rfc8259 |
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40 | */ |
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41 | |
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42 | static CxJsonValue cx_json_value_nothing = {.type = CX_JSON_NOTHING}; |
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43 | |
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44 | static void token_destroy(CxJsonToken *token) { |
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45 | if (token->allocated) { |
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46 | cx_strfree(&token->content); |
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47 | } |
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48 | } |
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49 | |
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50 | static int num_isexp(const char *content, size_t length, size_t pos) { |
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51 | if (pos >= length) { |
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52 | return 0; |
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53 | } |
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54 | |
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55 | int ok = 0; |
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56 | for (size_t i = pos; i < length; i++) { |
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57 | char c = content[i]; |
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58 | if (isdigit(c)) { |
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59 | ok = 1; |
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60 | } else if (i == pos) { |
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61 | if (!(c == '+' || c == '-')) { |
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62 | return 0; |
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63 | } |
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64 | } else { |
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65 | return 0; |
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66 | } |
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67 | } |
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68 | |
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69 | return ok; |
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70 | } |
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71 | |
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72 | static CxJsonTokenType token_numbertype(const char *content, size_t length) { |
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73 | if (length == 0) return CX_JSON_TOKEN_ERROR; |
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74 | |
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75 | if (content[0] != '-' && !isdigit(content[0])) { |
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76 | return CX_JSON_TOKEN_ERROR; |
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77 | } |
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78 | |
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79 | CxJsonTokenType type = CX_JSON_TOKEN_INTEGER; |
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80 | for (size_t i = 1; i < length; i++) { |
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81 | if (content[i] == '.') { |
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82 | if (type == CX_JSON_TOKEN_NUMBER) { |
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83 | return CX_JSON_TOKEN_ERROR; // more than one decimal separator |
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84 | } |
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85 | type = CX_JSON_TOKEN_NUMBER; |
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86 | } else if (content[i] == 'e' || content[i] == 'E') { |
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87 | return num_isexp(content, length, i + 1) ? CX_JSON_TOKEN_NUMBER : CX_JSON_TOKEN_ERROR; |
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88 | } else if (!isdigit(content[i])) { |
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89 | return CX_JSON_TOKEN_ERROR; // char is not a digit, decimal separator or exponent sep |
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90 | } |
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91 | } |
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92 | |
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93 | return type; |
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94 | } |
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95 | |
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96 | static CxJsonToken token_create(CxJson *json, bool isstring, size_t start, size_t end) { |
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97 | cxmutstr str = cx_mutstrn(json->buffer.space + start, end - start); |
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98 | bool allocated = false; |
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99 | if (json->uncompleted.tokentype != CX_JSON_NO_TOKEN) { |
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100 | allocated = true; |
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101 | str = cx_strcat_m(json->uncompleted.content, 1, str); |
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102 | if (str.ptr == NULL) { |
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103 | return (CxJsonToken){CX_JSON_NO_TOKEN, false, {NULL, 0}}; |
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104 | } |
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105 | } |
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106 | json->uncompleted = (CxJsonToken){0}; |
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107 | CxJsonTokenType ttype; |
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108 | if (isstring) { |
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109 | ttype = CX_JSON_TOKEN_STRING; |
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110 | } else { |
1009 | 111 | cxstring s = cx_strcast(str); |
112 | if (!cx_strcmp(s, CX_STR("true")) || !cx_strcmp(s, CX_STR("false")) | |
113 | || !cx_strcmp(s, CX_STR("null"))) { | |
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114 | ttype = CX_JSON_TOKEN_LITERAL; |
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115 | } else { |
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116 | ttype = token_numbertype(str.ptr, str.length); |
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117 | } |
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118 | } |
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119 | if (ttype == CX_JSON_TOKEN_ERROR) { |
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120 | if (allocated) { |
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121 | cx_strfree(&str); |
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122 | } |
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123 | return (CxJsonToken){CX_JSON_TOKEN_ERROR, false, {NULL, 0}}; |
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124 | } |
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125 | return (CxJsonToken){ttype, allocated, str}; |
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126 | } |
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127 | |
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128 | static CxJsonTokenType char2ttype(char c) { |
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129 | switch (c) { |
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130 | case '[': { |
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131 | return CX_JSON_TOKEN_BEGIN_ARRAY; |
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132 | } |
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133 | case '{': { |
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134 | return CX_JSON_TOKEN_BEGIN_OBJECT; |
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135 | } |
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136 | case ']': { |
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137 | return CX_JSON_TOKEN_END_ARRAY; |
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138 | } |
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139 | case '}': { |
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140 | return CX_JSON_TOKEN_END_OBJECT; |
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141 | } |
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142 | case ':': { |
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143 | return CX_JSON_TOKEN_NAME_SEPARATOR; |
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144 | } |
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145 | case ',': { |
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146 | return CX_JSON_TOKEN_VALUE_SEPARATOR; |
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147 | } |
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148 | case '"': { |
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149 | return CX_JSON_TOKEN_STRING; |
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150 | } |
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151 | default: { |
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152 | if (isspace(c)) { |
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153 | return CX_JSON_TOKEN_SPACE; |
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154 | } |
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155 | } |
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156 | } |
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157 | return CX_JSON_NO_TOKEN; |
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158 | } |
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159 | |
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160 | static enum cx_json_status token_parse_next(CxJson *json, CxJsonToken *result) { |
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161 | // check if there is data in the buffer |
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162 | if (cxBufferEof(&json->buffer)) { |
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163 | return json->uncompleted.tokentype == CX_JSON_NO_TOKEN ? |
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164 | CX_JSON_NO_DATA : CX_JSON_INCOMPLETE_DATA; |
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165 | } |
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166 | |
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167 | // current token type and start index |
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168 | CxJsonTokenType ttype = json->uncompleted.tokentype; |
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169 | size_t token_start = json->buffer.pos; |
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170 | |
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171 | for (size_t i = json->buffer.pos; i < json->buffer.size; i++) { |
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172 | char c = json->buffer.space[i]; |
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173 | if (ttype != CX_JSON_TOKEN_STRING) { |
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174 | // currently non-string token |
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175 | CxJsonTokenType ctype = char2ttype(c); // start of new token? |
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176 | if (ttype == CX_JSON_NO_TOKEN) { |
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177 | if (ctype == CX_JSON_TOKEN_SPACE) { |
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178 | json->buffer.pos++; |
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179 | continue; |
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180 | } else if (ctype == CX_JSON_TOKEN_STRING) { |
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181 | // begin string |
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182 | ttype = CX_JSON_TOKEN_STRING; |
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183 | token_start = i; |
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184 | } else if (ctype != CX_JSON_NO_TOKEN) { |
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185 | // single-char token |
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186 | json->buffer.pos = i + 1; |
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187 | *result = (CxJsonToken){ctype, false, {NULL, 0}}; |
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188 | return CX_JSON_NO_ERROR; |
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189 | } else { |
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190 | ttype = CX_JSON_TOKEN_LITERAL; // number or literal |
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191 | token_start = i; |
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192 | } |
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193 | } else { |
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194 | // finish token |
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195 | if (ctype != CX_JSON_NO_TOKEN) { |
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196 | *result = token_create(json, false, token_start, i); |
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197 | if (result->tokentype == CX_JSON_NO_TOKEN) { |
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198 | return CX_JSON_BUFFER_ALLOC_FAILED; |
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199 | } |
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200 | if (result->tokentype == CX_JSON_TOKEN_ERROR) { |
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201 | return CX_JSON_FORMAT_ERROR_NUMBER; |
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202 | } |
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203 | json->buffer.pos = i; |
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204 | return CX_JSON_NO_ERROR; |
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205 | } |
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206 | } |
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207 | } else { |
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208 | // currently inside a string |
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209 | if (json->tokenizer_escape) { |
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210 | json->tokenizer_escape = false; |
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211 | } else { |
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212 | if (c == '"') { |
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213 | *result = token_create(json, true, token_start, i + 1); |
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214 | if (result->tokentype == CX_JSON_NO_TOKEN) { |
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215 | return CX_JSON_BUFFER_ALLOC_FAILED; |
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216 | } |
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217 | json->buffer.pos = i + 1; |
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218 | return CX_JSON_NO_ERROR; |
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219 | } else if (c == '\\') { |
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220 | json->tokenizer_escape = true; |
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221 | } |
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222 | } |
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223 | } |
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224 | } |
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225 | |
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226 | if (ttype != CX_JSON_NO_TOKEN) { |
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227 | // uncompleted token |
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228 | size_t uncompleted_len = json->buffer.size - token_start; |
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229 | if (json->uncompleted.tokentype == CX_JSON_NO_TOKEN) { |
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230 | // current token is uncompleted |
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231 | // save current token content |
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232 | CxJsonToken uncompleted = { |
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233 | ttype, true, |
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234 | cx_strdup(cx_strn(json->buffer.space + token_start, uncompleted_len)) |
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235 | }; |
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236 | if (uncompleted.content.ptr == NULL) { |
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237 | return CX_JSON_BUFFER_ALLOC_FAILED; |
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238 | } |
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239 | json->uncompleted = uncompleted; |
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240 | } else { |
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241 | // previously we also had an uncompleted token |
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242 | // combine the uncompleted token with the current token |
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243 | assert(json->uncompleted.allocated); |
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244 | cxmutstr str = cx_strcat_m(json->uncompleted.content, 1, |
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245 | cx_strn(json->buffer.space + token_start, uncompleted_len)); |
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246 | if (str.ptr == NULL) { |
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247 | return CX_JSON_BUFFER_ALLOC_FAILED; |
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248 | } |
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249 | json->uncompleted.content = str; |
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250 | } |
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251 | // advance the buffer position - we saved the stuff in the uncompleted token |
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252 | json->buffer.pos += uncompleted_len; |
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253 | } |
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254 | |
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255 | return CX_JSON_INCOMPLETE_DATA; |
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256 | } |
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257 | |
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258 | static cxmutstr unescape_string(const CxAllocator *a, cxmutstr str) { |
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259 | // TODO: support more escape sequences |
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260 | // we know that the unescaped string will be shorter by at least 2 chars |
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261 | cxmutstr result; |
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262 | result.length = 0; |
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263 | result.ptr = cxMalloc(a, str.length - 1); |
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264 | if (result.ptr == NULL) { |
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265 | return result; |
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266 | } |
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267 | |
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268 | bool u = false; |
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269 | for (size_t i = 1; i < str.length - 1; i++) { |
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270 | char c = str.ptr[i]; |
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271 | if (u) { |
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272 | u = false; |
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273 | if (c == 'n') { |
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274 | c = '\n'; |
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275 | } else if (c == 't') { |
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276 | c = '\t'; |
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277 | } |
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278 | result.ptr[result.length++] = c; |
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279 | } else { |
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280 | if (c == '\\') { |
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281 | u = true; |
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282 | } else { |
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283 | result.ptr[result.length++] = c; |
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284 | } |
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285 | } |
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286 | } |
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287 | result.ptr[result.length] = 0; |
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288 | |
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289 | return result; |
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290 | } |
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291 | |
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292 | static int parse_number(cxmutstr str, void *value, bool asint) { |
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293 | char *endptr = NULL; |
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294 | if (str.length > 30) { |
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295 | return 1; |
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296 | } |
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297 | // the buffer guarantees that we are working on a copied string |
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298 | char c = str.ptr[str.length]; |
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299 | str.ptr[str.length] = 0; |
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300 | |
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301 | if (asint) { |
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302 | errno = 0; |
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303 | long long v = strtoll(str.ptr, &endptr, 10); |
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304 | if (errno == ERANGE) { |
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305 | return 1; |
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306 | } |
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307 | *((int64_t*)value) = (int64_t) v; |
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308 | } else { |
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309 | // TODO: proper JSON spec number parser |
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310 | // TODO: also return an error when loss of precision is high |
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311 | double v = strtod(str.ptr, &endptr); |
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312 | *((double*)value) = v; |
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313 | } |
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314 | |
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315 | // recover from the hack |
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316 | str.ptr[str.length] = c; |
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317 | |
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318 | return endptr != &str.ptr[str.length]; |
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319 | } |
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320 | |
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321 | static CxJsonValue* create_json_value(CxJson *json, CxJsonValueType type) { |
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322 | CxJsonValue *v = cxMalloc(json->allocator, sizeof(CxJsonValue)); |
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323 | if (v == NULL) { |
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324 | return NULL; |
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325 | } |
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326 | |
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327 | // initialize the value |
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328 | if (type == CX_JSON_ARRAY) { |
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329 | cx_array_initialize_a(json->allocator, v->value.array.array, 16); |
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330 | if (v->value.array.array == NULL) { |
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331 | cxFree(json->allocator, v); |
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332 | return NULL; |
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333 | } |
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334 | } else if (type == CX_JSON_OBJECT) { |
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335 | cx_array_initialize_a(json->allocator, v->value.object.values, 16); |
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336 | if (v->value.object.values == NULL) { |
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337 | cxFree(json->allocator, v); |
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338 | return NULL; |
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339 | } |
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340 | } else { |
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341 | memset(v, 0, sizeof(CxJsonValue)); |
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342 | } |
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343 | v->type = type; |
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344 | v->allocator = json->allocator; |
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345 | |
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346 | // add the new value to a possible parent |
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347 | CxArrayReallocator value_realloc = cx_array_reallocator(json->allocator, NULL); |
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348 | if (json->vbuf_size > 0) { |
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349 | CxJsonValue *parent = json->vbuf[json->vbuf_size - 1]; |
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350 | if (parent->type == CX_JSON_ARRAY) { |
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351 | cx_array_simple_add_a(&value_realloc, parent->value.array.array, v); |
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352 | } else if (parent->type == CX_JSON_OBJECT) { |
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353 | assert(parent->value.object.values_size > 0); |
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354 | assert(parent->value.object.values[parent->value.object.values_size - 1].value == NULL); |
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355 | parent->value.object.values[parent->value.object.values_size - 1].value = v; |
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356 | } else { |
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357 | assert(false); |
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358 | } |
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359 | } |
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360 | |
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361 | // add the new value to the stack, if it is an array or object |
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362 | if (type == CX_JSON_ARRAY || type == CX_JSON_OBJECT) { |
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363 | CxArrayReallocator vbuf_realloc = cx_array_reallocator(NULL, json->vbuf_internal); |
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364 | if (cx_array_simple_add_a(&vbuf_realloc, json->vbuf, v)) { |
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365 | cxFree(json->allocator, v); |
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366 | return NULL; |
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367 | } |
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368 | } |
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369 | |
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370 | // if currently no value is parsed, this is now the value of interest |
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371 | if (json->parsed == NULL) { |
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372 | json->parsed = v; |
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373 | } |
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374 | |
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375 | return v; |
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376 | } |
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377 | |
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378 | #define JP_STATE_VALUE_BEGIN 0 |
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379 | #define JP_STATE_VALUE_END 10 |
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380 | #define JP_STATE_VALUE_BEGIN_OBJ 1 |
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381 | #define JP_STATE_OBJ_SEP_OR_CLOSE 11 |
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382 | #define JP_STATE_VALUE_BEGIN_AR 2 |
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383 | #define JP_STATE_ARRAY_SEP_OR_CLOSE 12 |
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384 | #define JP_STATE_OBJ_NAME_OR_CLOSE 5 |
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385 | #define JP_STATE_OBJ_NAME 6 |
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386 | #define JP_STATE_OBJ_COLON 7 |
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387 | |
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388 | void cxJsonInit(CxJson *json, const CxAllocator *allocator) { |
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389 | if (allocator == NULL) { |
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390 | allocator = cxDefaultAllocator; |
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391 | } |
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392 | |
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393 | memset(json, 0, sizeof(CxJson)); |
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394 | json->allocator = allocator; |
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395 | |
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396 | json->states = json->states_internal; |
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397 | json->states_capacity = cx_nmemb(json->states_internal); |
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398 | json->states[0] = JP_STATE_VALUE_BEGIN; |
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399 | json->states_size = 1; |
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400 | |
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401 | json->vbuf = json->vbuf_internal; |
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402 | json->vbuf_capacity = cx_nmemb(json->vbuf_internal); |
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403 | |
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404 | cxBufferInit(&json->buffer, NULL, 256, NULL, CX_BUFFER_AUTO_EXTEND); |
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405 | } |
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406 | |
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407 | void cxJsonDestroy(CxJson *json) { |
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408 | cxBufferDestroy(&json->buffer); |
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409 | if (json->states != json->states_internal) { |
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410 | free(json->states); |
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411 | } |
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412 | if (json->vbuf != json->vbuf_internal) { |
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413 | free(json->vbuf); |
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414 | } |
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415 | cxJsonValueFree(json->parsed); |
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416 | json->parsed = NULL; |
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417 | } |
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418 | |
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419 | int cxJsonFilln(CxJson *json, const char *buf, size_t size) { |
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420 | // we use the UCX buffer to write the data |
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421 | // but reset the position immediately to enable parsing |
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422 | size_t old_pos = json->buffer.pos; |
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423 | cxBufferSeek(&json->buffer, 0, SEEK_END); |
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424 | size_t written = cxBufferWrite(buf, 1, size, &json->buffer); |
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425 | if (0 == cxBufferTerminate(&json->buffer)) { |
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426 | written++; |
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427 | } |
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428 | json->buffer.pos = old_pos; |
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429 | return written != size + 1; |
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430 | } |
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431 | |
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432 | static void json_add_state(CxJson *json, int state) { |
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433 | // we have guaranteed the necessary space with cx_array_simple_reserve() |
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434 | // therefore, we can safely add the state in the simplest way possible |
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435 | json->states[json->states_size++] = state; |
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436 | } |
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437 | |
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438 | #define return_rec(code) \ |
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439 | token_destroy(&token); \ |
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440 | return code |
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441 | |
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442 | static enum cx_json_status json_parse(CxJson *json) { |
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443 | // Reserve a pointer for a possibly read value |
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444 | CxJsonValue *vbuf = NULL; |
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445 | |
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446 | // grab the next token |
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447 | CxJsonToken token; |
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448 | { |
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449 | enum cx_json_status ret = token_parse_next(json, &token); |
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450 | if (ret != CX_JSON_NO_ERROR) { |
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451 | return ret; |
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452 | } |
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453 | } |
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454 | |
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455 | // pop the current state |
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456 | assert(json->states_size > 0); |
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457 | int state = json->states[--json->states_size]; |
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458 | |
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459 | // guarantee that at least two more states fit on the stack |
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460 | CxArrayReallocator state_realloc = cx_array_reallocator(NULL, json->states_internal); |
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461 | if (cx_array_simple_reserve_a(&state_realloc, json->states, 2)) { |
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462 | return CX_JSON_BUFFER_ALLOC_FAILED; |
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463 | } |
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464 | |
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465 | |
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466 | // 0 JP_STATE_VALUE_BEGIN value begin |
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467 | // 10 JP_STATE_VALUE_END expect value end |
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468 | // 1 JP_STATE_VALUE_BEGIN_OBJ value begin (inside object) |
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469 | // 11 JP_STATE_OBJ_SEP_OR_CLOSE object, expect separator, objclose |
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470 | // 2 JP_STATE_VALUE_BEGIN_AR value begin (inside array) |
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471 | // 12 JP_STATE_ARRAY_SEP_OR_CLOSE array, expect separator or arrayclose |
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472 | // 5 JP_STATE_OBJ_NAME_OR_CLOSE object, expect name or objclose |
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473 | // 6 JP_STATE_OBJ_NAME object, expect name |
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474 | // 7 JP_STATE_OBJ_COLON object, expect ':' |
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475 | |
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476 | if (state < 3) { |
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477 | // push expected end state to the stack |
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478 | json_add_state(json, 10 + state); |
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479 | switch (token.tokentype) { |
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480 | case CX_JSON_TOKEN_BEGIN_ARRAY: { |
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481 | if (create_json_value(json, CX_JSON_ARRAY) == NULL) { |
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482 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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483 | } |
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484 | json_add_state(json, JP_STATE_VALUE_BEGIN_AR); |
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485 | return_rec(CX_JSON_NO_ERROR); |
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486 | } |
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487 | case CX_JSON_TOKEN_BEGIN_OBJECT: { |
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488 | if (create_json_value(json, CX_JSON_OBJECT) == NULL) { |
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489 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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490 | } |
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491 | json_add_state(json, JP_STATE_OBJ_NAME_OR_CLOSE); |
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492 | return_rec(CX_JSON_NO_ERROR); |
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493 | } |
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494 | case CX_JSON_TOKEN_STRING: { |
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495 | if ((vbuf = create_json_value(json, CX_JSON_STRING)) == NULL) { |
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496 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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497 | } |
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498 | cxmutstr str = unescape_string(json->allocator, token.content); |
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499 | if (str.ptr == NULL) { |
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500 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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501 | } |
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502 | vbuf->value.string = str; |
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503 | return_rec(CX_JSON_NO_ERROR); |
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504 | } |
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505 | case CX_JSON_TOKEN_INTEGER: |
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506 | case CX_JSON_TOKEN_NUMBER: { |
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507 | int type = token.tokentype == CX_JSON_TOKEN_INTEGER ? CX_JSON_INTEGER : CX_JSON_NUMBER; |
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508 | if (NULL == (vbuf = create_json_value(json, type))) { |
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509 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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510 | } |
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511 | if (parse_number(token.content, &vbuf->value,type == CX_JSON_INTEGER)) { |
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512 | return_rec(CX_JSON_FORMAT_ERROR_NUMBER); |
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513 | } |
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514 | return_rec(CX_JSON_NO_ERROR); |
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515 | } |
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516 | case CX_JSON_TOKEN_LITERAL: { |
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517 | if ((vbuf = create_json_value(json, CX_JSON_LITERAL)) == NULL) { |
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518 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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519 | } |
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520 | if (0 == cx_strcmp(cx_strcast(token.content), cx_str("true"))) { |
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521 | vbuf->value.literal = CX_JSON_TRUE; |
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522 | } else if (0 == cx_strcmp(cx_strcast(token.content), cx_str("false"))) { |
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523 | vbuf->value.literal = CX_JSON_FALSE; |
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524 | } else { |
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525 | vbuf->value.literal = CX_JSON_NULL; |
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526 | } |
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527 | return_rec(CX_JSON_NO_ERROR); |
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528 | } |
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529 | default: { |
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530 | return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN); |
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531 | } |
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532 | } |
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533 | } else if (state == JP_STATE_ARRAY_SEP_OR_CLOSE) { |
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534 | // expect ',' or ']' |
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535 | if (token.tokentype == CX_JSON_TOKEN_VALUE_SEPARATOR) { |
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536 | json_add_state(json, JP_STATE_VALUE_BEGIN_AR); |
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537 | return_rec(CX_JSON_NO_ERROR); |
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538 | } else if (token.tokentype == CX_JSON_TOKEN_END_ARRAY) { |
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539 | // discard the array from the value buffer |
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540 | json->vbuf_size--; |
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541 | return_rec(CX_JSON_NO_ERROR); |
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542 | } else { |
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543 | return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN); |
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544 | } |
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545 | } else if (state == JP_STATE_OBJ_NAME_OR_CLOSE || state == JP_STATE_OBJ_NAME) { |
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546 | if (state == JP_STATE_OBJ_NAME_OR_CLOSE && token.tokentype == CX_JSON_TOKEN_END_OBJECT) { |
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547 | // discard the obj from the value buffer |
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548 | json->vbuf_size--; |
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549 | return_rec(CX_JSON_NO_ERROR); |
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550 | } else { |
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551 | // expect string |
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552 | if (token.tokentype != CX_JSON_TOKEN_STRING) { |
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553 | return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN); |
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554 | } |
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555 | |
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556 | // add new entry |
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557 | cxmutstr name = unescape_string(json->allocator, token.content); |
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558 | if (name.ptr == NULL) { |
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559 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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560 | } |
1037
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561 | CxJsonObjValue kv = {name, NULL}; |
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562 | assert(json->vbuf_size > 0); |
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563 | CxJsonValue *parent = json->vbuf[json->vbuf_size - 1]; |
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564 | assert(parent != NULL); |
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565 | assert(parent->type == CX_JSON_OBJECT); |
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566 | CxArrayReallocator value_realloc = cx_array_reallocator(json->allocator, NULL); |
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567 | if (cx_array_simple_add_a(&value_realloc, parent->value.object.values, kv)) { |
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568 | return_rec(CX_JSON_VALUE_ALLOC_FAILED); |
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569 | } |
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570 | |
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571 | // next state |
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572 | json_add_state(json, JP_STATE_OBJ_COLON); |
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573 | return_rec(CX_JSON_NO_ERROR); |
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574 | } |
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575 | } else if (state == JP_STATE_OBJ_COLON) { |
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576 | // expect ':' |
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577 | if (token.tokentype != CX_JSON_TOKEN_NAME_SEPARATOR) { |
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578 | return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN); |
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579 | } |
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580 | // next state |
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581 | json_add_state(json, JP_STATE_VALUE_BEGIN_OBJ); |
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582 | return_rec(CX_JSON_NO_ERROR); |
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583 | } else if (state == JP_STATE_OBJ_SEP_OR_CLOSE) { |
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584 | // expect ',' or '}' |
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585 | if (token.tokentype == CX_JSON_TOKEN_VALUE_SEPARATOR) { |
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586 | json_add_state(json, JP_STATE_OBJ_NAME); |
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587 | return_rec(CX_JSON_NO_ERROR); |
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588 | } else if (token.tokentype == CX_JSON_TOKEN_END_OBJECT) { |
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589 | // discard the obj from the value buffer |
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590 | json->vbuf_size--; |
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591 | return_rec(CX_JSON_NO_ERROR); |
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592 | } else { |
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|
593 | return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN); |
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594 | } |
1000
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595 | } else { |
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|
596 | // should be unreachable |
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597 | assert(false); |
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598 | return_rec(-1); |
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599 | } |
1000
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600 | } |
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601 | |
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602 | CxJsonStatus cxJsonNext(CxJson *json, CxJsonValue **value) { |
1000
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603 | // initialize output value |
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604 | *value = &cx_json_value_nothing; |
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|
605 | |
1000
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606 | // parse data |
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|
607 | CxJsonStatus result; |
1000
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|
608 | do { |
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609 | result = json_parse(json); |
1008
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610 | cxBufferShiftLeft(&json->buffer, json->buffer.pos); |
1002
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611 | if (result == CX_JSON_NO_ERROR && json->states_size == 1) { |
1000
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612 | // final state reached |
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613 | assert(json->states[0] == JP_STATE_VALUE_END); |
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614 | assert(json->vbuf_size == 0); |
937
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615 | |
1000
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616 | // write output value |
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617 | *value = json->parsed; |
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618 | json->parsed = NULL; |
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619 | |
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620 | // re-initialize state machine |
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621 | json->states[0] = JP_STATE_VALUE_BEGIN; |
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622 | |
1002
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623 | return CX_JSON_NO_ERROR; |
1000
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624 | } |
1002
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625 | } while (result == CX_JSON_NO_ERROR); |
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626 | |
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627 | // the parser might think there is no data |
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628 | // but when we did not reach the final state, |
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629 | // we know that there must be more to come |
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630 | if (result == CX_JSON_NO_DATA && json->states_size > 1) { |
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631 | return CX_JSON_INCOMPLETE_DATA; |
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632 | } |
1000
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633 | |
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634 | return result; |
937
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635 | } |
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636 | |
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637 | void cxJsonValueFree(CxJsonValue *value) { |
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638 | if (value == NULL || value->type == CX_JSON_NOTHING) return; |
937
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639 | switch (value->type) { |
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640 | case CX_JSON_OBJECT: { |
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641 | CxJsonObject obj = value->value.object; |
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642 | for (size_t i = 0; i < obj.values_size; i++) { |
937
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643 | cxJsonValueFree(obj.values[i].value); |
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644 | cx_strfree_a(value->allocator, &obj.values[i].name); |
937
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645 | } |
996
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646 | cxFree(value->allocator, obj.values); |
937
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647 | break; |
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648 | } |
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649 | case CX_JSON_ARRAY: { |
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650 | CxJsonArray array = value->value.array; |
967
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651 | for (size_t i = 0; i < array.array_size; i++) { |
937
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652 | cxJsonValueFree(array.array[i]); |
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653 | } |
996
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654 | cxFree(value->allocator, array.array); |
937
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655 | break; |
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656 | } |
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657 | case CX_JSON_STRING: { |
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658 | cxFree(value->allocator, value->value.string.ptr); |
937
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659 | break; |
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660 | } |
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661 | default: { |
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662 | break; |
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663 | } |
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664 | } |
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665 | cxFree(value->allocator, value); |
937
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666 | } |
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667 | |
1009 | 668 | CxJsonValue *cxJsonArrGet(const CxJsonValue *value, size_t index) { |
967
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669 | if (index >= value->value.array.array_size) { |
937
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670 | return &cx_json_value_nothing; |
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671 | } |
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672 | return value->value.array.array[index]; |
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673 | } |
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674 | |
1033
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675 | static void *cx_json_iter_current(const void *it) { |
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676 | const CxIterator *iter = it; |
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677 | return *(CxJsonValue**)iter->elem_handle; |
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678 | } |
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679 | |
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680 | static bool cx_json_iter_valid(const void *it) { |
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681 | const CxIterator *iter = it; |
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682 | return iter->index < iter->elem_count; |
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683 | } |
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684 | |
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685 | static void cx_json_iter_next(void *it) { |
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686 | CxIterator *iter = it; |
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687 | iter->index++; |
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688 | iter->elem_handle = (char *) iter->elem_handle + sizeof(void *); |
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689 | } |
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690 | |
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691 | CxIterator cxJsonArrIter(const CxJsonValue *value) { |
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692 | CxIterator iter; |
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693 | |
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694 | iter.index = 0; |
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695 | iter.elem_count = value->value.array.array_size; |
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696 | iter.src_handle.m = value->value.array.array; |
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697 | iter.elem_handle = iter.src_handle.m; |
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698 | iter.elem_size = sizeof(CxJsonValue*); |
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699 | iter.base.valid = cx_json_iter_valid; |
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700 | iter.base.current = cx_json_iter_current; |
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701 | iter.base.next = cx_json_iter_next; |
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702 | iter.base.remove = false; |
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703 | iter.base.mutating = false; |
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704 | |
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705 | return iter; |
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706 | } |
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707 | |
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708 | CxJsonValue *cx_json_obj_get_cxstr(const CxJsonValue *value, cxstring name) { |
1009 | 709 | const CxJsonObject *obj = &(value->value.object); |
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710 | // TODO: think about sorting the object so that we can use binary search here |
967
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711 | for (size_t i = 0; i < obj->values_size; i++) { |
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712 | if (0 == cx_strcmp(name, cx_strcast(obj->values[i].name))) { |
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713 | return obj->values[i].value; |
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714 | } |
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715 | } |
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716 | return &cx_json_value_nothing; |
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717 | } |