Mercurial > vim
annotate src/json.c @ 7732:4a4f1dd1abe8 v7.4.1164
commit https://github.com/vim/vim/commit/6039c7f05376f0e470cf62bf2757e653aea357f3
Author: Bram Moolenaar <Bram@vim.org>
Date: Sun Jan 24 15:05:32 2016 +0100
patch 7.4.1164
Problem: No tests for comparing special variables. Error in jsondecode()
not reported. test_json does not work Japanse system.
Solution: Set scriptencoding. (Ken Takata) Add a few more tests. Add error.
author | Christian Brabandt <cb@256bit.org> |
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date | Sun, 24 Jan 2016 15:15:04 +0100 |
parents | 87f3f9536ecf |
children | f2ddad8cbce7 |
rev | line source |
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1 /* vi:set ts=8 sts=4 sw=4: |
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2 * |
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3 * VIM - Vi IMproved by Bram Moolenaar |
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4 * |
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5 * Do ":help uganda" in Vim to read copying and usage conditions. |
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6 * Do ":help credits" in Vim to see a list of people who contributed. |
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7 * See README.txt for an overview of the Vim source code. |
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8 */ |
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9 |
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10 /* |
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11 * json.c: Encoding and decoding JSON. |
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12 * |
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13 * Follows this standard: http://www.ietf.org/rfc/rfc4627.txt |
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14 */ |
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15 |
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16 #include "vim.h" |
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17 |
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18 #if defined(FEAT_EVAL) || defined(PROTO) |
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19 static void json_decode_item(js_read_T *reader, typval_T *res); |
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20 |
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21 /* |
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22 * Encode "val" into a JSON format string. |
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23 */ |
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24 char_u * |
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25 json_encode(typval_T *val) |
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26 { |
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27 garray_T ga; |
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28 |
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29 /* Store bytes in the growarray. */ |
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30 ga_init2(&ga, 1, 4000); |
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31 json_encode_item(&ga, val, get_copyID()); |
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32 return ga.ga_data; |
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33 } |
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34 |
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35 static void |
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36 write_string(garray_T *gap, char_u *str) |
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37 { |
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38 char_u *res = str; |
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39 char_u numbuf[NUMBUFLEN]; |
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40 |
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41 if (res == NULL) |
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42 ga_concat(gap, (char_u *)"null"); |
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43 else |
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44 { |
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45 ga_append(gap, '"'); |
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46 while (*res != NUL) |
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47 { |
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48 int c = PTR2CHAR(res); |
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49 |
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50 switch (c) |
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51 { |
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52 case 0x08: |
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53 ga_append(gap, '\\'); ga_append(gap, 'b'); break; |
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54 case 0x09: |
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55 ga_append(gap, '\\'); ga_append(gap, 't'); break; |
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56 case 0x0a: |
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57 ga_append(gap, '\\'); ga_append(gap, 'n'); break; |
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58 case 0x0c: |
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59 ga_append(gap, '\\'); ga_append(gap, 'f'); break; |
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60 case 0x0d: |
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61 ga_append(gap, '\\'); ga_append(gap, 'r'); break; |
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62 case 0x22: /* " */ |
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63 case 0x5c: /* \ */ |
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64 ga_append(gap, '\\'); |
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65 ga_append(gap, c); |
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66 break; |
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67 default: |
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68 if (c >= 0x20) |
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69 { |
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70 numbuf[mb_char2bytes(c, numbuf)] = NUL; |
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71 ga_concat(gap, numbuf); |
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72 } |
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73 else |
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74 { |
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75 vim_snprintf((char *)numbuf, NUMBUFLEN, |
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76 "\\u%04lx", (long)c); |
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77 ga_concat(gap, numbuf); |
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78 } |
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79 } |
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80 mb_cptr_adv(res); |
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81 } |
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82 ga_append(gap, '"'); |
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83 } |
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84 } |
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85 |
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86 void |
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87 json_encode_item(garray_T *gap, typval_T *val, int copyID) |
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88 { |
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89 char_u numbuf[NUMBUFLEN]; |
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90 char_u *res; |
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91 list_T *l; |
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92 dict_T *d; |
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93 |
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94 switch (val->v_type) |
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95 { |
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96 case VAR_SPECIAL: |
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97 switch(val->vval.v_number) |
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98 { |
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99 case VVAL_FALSE: ga_concat(gap, (char_u *)"false"); break; |
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100 case VVAL_TRUE: ga_concat(gap, (char_u *)"true"); break; |
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101 case VVAL_NONE: break; |
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102 case VVAL_NULL: ga_concat(gap, (char_u *)"null"); break; |
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103 } |
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104 break; |
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105 |
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106 case VAR_NUMBER: |
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107 vim_snprintf((char *)numbuf, NUMBUFLEN, "%ld", |
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108 (long)val->vval.v_number); |
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109 ga_concat(gap, numbuf); |
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110 break; |
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111 |
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112 case VAR_STRING: |
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113 res = val->vval.v_string; |
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114 write_string(gap, res); |
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115 break; |
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116 |
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117 case VAR_FUNC: |
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118 /* no JSON equivalent, skip */ |
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119 break; |
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120 |
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121 case VAR_LIST: |
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122 l = val->vval.v_list; |
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123 if (l == NULL) |
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124 ga_concat(gap, (char_u *)"null"); |
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125 else |
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126 { |
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127 if (l->lv_copyID == copyID) |
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128 ga_concat(gap, (char_u *)"[]"); |
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129 else |
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130 { |
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131 listitem_T *li; |
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132 |
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133 l->lv_copyID = copyID; |
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134 ga_append(gap, '['); |
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135 for (li = l->lv_first; li != NULL && !got_int; ) |
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136 { |
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137 json_encode_item(gap, &li->li_tv, copyID); |
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138 li = li->li_next; |
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139 if (li != NULL) |
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140 ga_append(gap, ','); |
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141 } |
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142 ga_append(gap, ']'); |
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143 } |
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144 } |
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145 break; |
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146 |
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147 case VAR_DICT: |
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148 d = val->vval.v_dict; |
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149 if (d == NULL) |
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150 ga_concat(gap, (char_u *)"null"); |
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151 else |
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152 { |
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153 if (d->dv_copyID == copyID) |
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154 ga_concat(gap, (char_u *)"{}"); |
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155 else |
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156 { |
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157 int first = TRUE; |
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158 int todo = (int)d->dv_hashtab.ht_used; |
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159 hashitem_T *hi; |
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160 |
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161 d->dv_copyID = copyID; |
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162 ga_append(gap, '{'); |
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163 |
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164 for (hi = d->dv_hashtab.ht_array; todo > 0 && !got_int; |
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165 ++hi) |
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166 if (!HASHITEM_EMPTY(hi)) |
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167 { |
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168 --todo; |
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169 if (first) |
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170 first = FALSE; |
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171 else |
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172 ga_append(gap, ','); |
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173 write_string(gap, hi->hi_key); |
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174 ga_append(gap, ':'); |
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175 json_encode_item(gap, &dict_lookup(hi)->di_tv, |
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176 copyID); |
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177 } |
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178 ga_append(gap, '}'); |
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179 } |
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180 } |
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181 break; |
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182 |
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183 #ifdef FEAT_FLOAT |
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184 case VAR_FLOAT: |
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185 vim_snprintf((char *)numbuf, NUMBUFLEN, "%g", val->vval.v_float); |
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186 ga_concat(gap, numbuf); |
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187 break; |
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188 #endif |
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189 default: EMSG2(_(e_intern2), "json_encode_item()"); break; |
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190 } |
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191 } |
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192 |
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193 /* |
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194 * Skip white space in "reader". |
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195 */ |
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196 static void |
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197 json_skip_white(js_read_T *reader) |
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198 { |
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199 int c; |
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200 |
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201 while ((c = reader->js_buf[reader->js_used]) == ' ' |
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202 || c == TAB || c == NL || c == CAR) |
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203 ++reader->js_used; |
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204 } |
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205 |
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206 /* |
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207 * Make sure there are at least enough characters buffered to read a number. |
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208 */ |
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209 static void |
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210 json_fill_buffer(js_read_T *reader UNUSED) |
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211 { |
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212 /* TODO */ |
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213 } |
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214 |
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215 static void |
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216 json_decode_array(js_read_T *reader, typval_T *res) |
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217 { |
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218 char_u *p; |
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219 typval_T item; |
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220 listitem_T *li; |
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221 |
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222 if (rettv_list_alloc(res) == FAIL) |
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223 goto failsilent; |
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224 ++reader->js_used; /* consume the '[' */ |
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225 |
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226 while (TRUE) |
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227 { |
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228 json_skip_white(reader); |
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229 p = reader->js_buf + reader->js_used; |
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230 if (*p == NUL) |
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231 goto fail; |
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232 if (*p == ']') |
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233 { |
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234 ++reader->js_used; /* consume the ']' */ |
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235 return; |
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236 } |
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237 |
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238 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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239 json_fill_buffer(reader); |
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240 |
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241 json_decode_item(reader, &item); |
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242 li = listitem_alloc(); |
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243 if (li == NULL) |
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244 return; |
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245 li->li_tv = item; |
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246 list_append(res->vval.v_list, li); |
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247 |
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248 json_skip_white(reader); |
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249 p = reader->js_buf + reader->js_used; |
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250 if (*p == ',') |
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251 ++reader->js_used; |
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252 else if (*p != ']') |
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253 goto fail; |
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254 } |
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255 fail: |
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256 EMSG(_(e_invarg)); |
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257 failsilent: |
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258 res->v_type = VAR_SPECIAL; |
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259 res->vval.v_number = VVAL_NONE; |
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260 } |
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261 |
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262 static void |
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263 json_decode_object(js_read_T *reader, typval_T *res) |
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264 { |
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265 char_u *p; |
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266 typval_T tvkey; |
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267 typval_T item; |
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268 dictitem_T *di; |
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269 char_u buf[NUMBUFLEN]; |
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270 char_u *key; |
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271 |
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272 if (rettv_dict_alloc(res) == FAIL) |
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273 goto failsilent; |
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274 ++reader->js_used; /* consume the '{' */ |
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275 |
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276 while (TRUE) |
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277 { |
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278 json_skip_white(reader); |
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279 p = reader->js_buf + reader->js_used; |
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280 if (*p == NUL) |
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281 goto fail; |
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282 if (*p == '}') |
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283 { |
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284 ++reader->js_used; /* consume the '}' */ |
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285 return; |
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286 } |
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287 |
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288 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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289 json_fill_buffer(reader); |
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290 json_decode_item(reader, &tvkey); |
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291 key = get_tv_string_buf_chk(&tvkey, buf); |
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292 if (key == NULL || *key == NUL) |
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293 { |
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294 /* "key" is NULL when get_tv_string_buf_chk() gave an errmsg */ |
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295 if (key != NULL) |
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296 EMSG(_(e_emptykey)); |
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297 clear_tv(&tvkey); |
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298 goto failsilent; |
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299 } |
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300 |
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301 json_skip_white(reader); |
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302 p = reader->js_buf + reader->js_used; |
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303 if (*p != ':') |
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304 { |
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305 clear_tv(&tvkey); |
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306 goto fail; |
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307 } |
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308 ++reader->js_used; |
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309 json_skip_white(reader); |
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310 |
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311 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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312 json_fill_buffer(reader); |
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313 json_decode_item(reader, &item); |
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314 |
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315 di = dictitem_alloc(key); |
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316 clear_tv(&tvkey); |
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317 if (di == NULL) |
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318 { |
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319 clear_tv(&item); |
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320 goto fail; |
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321 } |
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322 di->di_tv = item; |
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323 if (dict_add(res->vval.v_dict, di) == FAIL) |
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324 dictitem_free(di); |
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325 |
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326 json_skip_white(reader); |
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327 p = reader->js_buf + reader->js_used; |
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328 if (*p == ',') |
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329 ++reader->js_used; |
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330 else if (*p != '}') |
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331 goto fail; |
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332 } |
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333 fail: |
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334 EMSG(_(e_invarg)); |
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335 failsilent: |
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336 res->v_type = VAR_SPECIAL; |
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337 res->vval.v_number = VVAL_NONE; |
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338 } |
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339 |
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340 static void |
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341 json_decode_string(js_read_T *reader, typval_T *res) |
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342 { |
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343 garray_T ga; |
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344 int len; |
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345 char_u *p = reader->js_buf + reader->js_used + 1; |
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346 int c; |
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347 long nr; |
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348 char_u buf[NUMBUFLEN]; |
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349 |
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350 ga_init2(&ga, 1, 200); |
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351 |
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352 /* TODO: fill buffer when needed. */ |
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353 while (*p != NUL && *p != '"') |
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354 { |
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355 if (*p == '\\') |
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356 { |
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357 c = -1; |
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358 switch (p[1]) |
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359 { |
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360 case 'b': c = BS; break; |
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361 case 't': c = TAB; break; |
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362 case 'n': c = NL; break; |
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363 case 'f': c = FF; break; |
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364 case 'r': c = CAR; break; |
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365 case 'u': |
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366 vim_str2nr(p + 2, NULL, &len, |
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367 STR2NR_HEX + STR2NR_FORCE, &nr, NULL, 4); |
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368 p += len + 2; |
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369 #ifdef FEAT_MBYTE |
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370 buf[(*mb_char2bytes)((int)nr, buf)] = NUL; |
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371 ga_concat(&ga, buf); |
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372 #else |
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373 ga_append(&ga, nr); |
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374 #endif |
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375 break; |
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376 default: c = p[1]; break; |
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377 } |
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378 if (c > 0) |
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379 { |
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380 p += 2; |
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381 ga_append(&ga, c); |
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382 } |
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383 } |
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384 else |
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385 { |
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386 len = MB_PTR2LEN(p); |
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387 if (ga_grow(&ga, len) == OK) |
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388 { |
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389 mch_memmove((char *)ga.ga_data + ga.ga_len, p, (size_t)len); |
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390 ga.ga_len += len; |
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391 } |
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392 p += len; |
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393 } |
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394 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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395 { |
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396 reader->js_used = (int)(p - reader->js_buf); |
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397 json_fill_buffer(reader); |
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398 p = reader->js_buf + reader->js_used; |
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399 } |
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400 } |
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401 reader->js_used = (int)(p - reader->js_buf); |
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402 if (*p == '"') |
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403 { |
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404 ++reader->js_used; |
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405 res->v_type = VAR_STRING; |
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406 if (ga.ga_data == NULL) |
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407 res->vval.v_string = NULL; |
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408 else |
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409 res->vval.v_string = vim_strsave(ga.ga_data); |
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410 } |
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411 else |
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412 { |
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413 EMSG(_(e_invarg)); |
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414 res->v_type = VAR_SPECIAL; |
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415 res->vval.v_number = VVAL_NONE; |
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416 } |
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417 ga_clear(&ga); |
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418 } |
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419 |
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420 /* |
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421 * Decode one item and put it in "result". |
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422 * Must already have skipped white space. |
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423 */ |
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424 static void |
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425 json_decode_item(js_read_T *reader, typval_T *res) |
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426 { |
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427 char_u *p = reader->js_buf + reader->js_used; |
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428 |
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429 switch (*p) |
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430 { |
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431 case '[': /* array */ |
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432 json_decode_array(reader, res); |
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433 return; |
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434 |
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435 case '{': /* object */ |
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436 json_decode_object(reader, res); |
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437 return; |
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438 |
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439 case '"': /* string */ |
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440 json_decode_string(reader, res); |
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441 return; |
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442 |
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443 case ',': /* comma: empty item */ |
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444 case NUL: /* empty */ |
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445 res->v_type = VAR_SPECIAL; |
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446 res->vval.v_number = VVAL_NONE; |
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447 return; |
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448 |
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449 default: |
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450 if (VIM_ISDIGIT(*p) || *p == '-') |
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451 { |
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452 int len; |
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453 char_u *sp = p; |
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454 #ifdef FEAT_FLOAT |
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455 if (*sp == '-') |
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456 ++sp; |
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457 sp = skipdigits(sp); |
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458 if (*sp == '.' || *sp == 'e' || *sp == 'E') |
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459 { |
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460 res->v_type = VAR_FLOAT; |
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461 len = string2float(p, &res->vval.v_float); |
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462 } |
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463 else |
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464 #endif |
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465 { |
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466 long nr; |
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467 |
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468 res->v_type = VAR_NUMBER; |
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469 vim_str2nr(reader->js_buf + reader->js_used, |
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470 NULL, &len, 0, /* what */ |
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471 &nr, NULL, 0); |
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472 res->vval.v_number = nr; |
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473 } |
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474 reader->js_used += len; |
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475 return; |
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476 } |
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477 if (STRNICMP((char *)p, "false", 5) == 0) |
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478 { |
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479 reader->js_used += 5; |
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480 res->v_type = VAR_SPECIAL; |
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481 res->vval.v_number = VVAL_FALSE; |
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482 return; |
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483 } |
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484 if (STRNICMP((char *)p, "true", 4) == 0) |
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485 { |
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486 reader->js_used += 4; |
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487 res->v_type = VAR_SPECIAL; |
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488 res->vval.v_number = VVAL_TRUE; |
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489 return; |
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490 } |
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491 if (STRNICMP((char *)p, "null", 4) == 0) |
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492 { |
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493 reader->js_used += 4; |
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494 res->v_type = VAR_SPECIAL; |
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495 res->vval.v_number = VVAL_NULL; |
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496 return; |
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497 } |
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498 break; |
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499 } |
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500 |
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501 EMSG(_(e_invarg)); |
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502 res->v_type = VAR_SPECIAL; |
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503 res->vval.v_number = VVAL_NONE; |
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504 } |
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505 |
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506 /* |
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507 * Decode the JSON from "reader" and store the result in "res". |
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508 */ |
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509 void |
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510 json_decode(js_read_T *reader, typval_T *res) |
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511 { |
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512 json_skip_white(reader); |
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513 json_decode_item(reader, res); |
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514 json_skip_white(reader); |
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515 if (reader->js_buf[reader->js_used] != NUL) |
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516 EMSG(_(e_invarg)); |
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517 } |
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518 #endif |