Mercurial > vim
annotate src/json.c @ 7791:6f81cf49da14 v7.4.1192
commit https://github.com/vim/vim/commit/fa06a517b5d5e37f40ab7c884bd334f089988fac
Author: Bram Moolenaar <Bram@vim.org>
Date: Thu Jan 28 22:46:58 2016 +0100
patch 7.4.1192
Problem: Can't build with FEAT_EVAL but without FEAT_MBYTE. (John
Marriott)
Solution: Add #ifdef for FEAT_MBYTE.
author | Christian Brabandt <cb@256bit.org> |
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date | Thu, 28 Jan 2016 23:00:04 +0100 |
parents | 3a99194bd187 |
children | 6b0891de44a9 |
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: https://tools.ietf.org/html/rfc7159.html |
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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 int json_encode_item(garray_T *gap, typval_T *val, int copyID); |
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20 static void json_decode_item(js_read_T *reader, typval_T *res); |
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21 |
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22 /* |
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23 * Encode "val" into a JSON format string. |
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24 */ |
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25 char_u * |
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26 json_encode(typval_T *val) |
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27 { |
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28 garray_T ga; |
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29 |
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30 /* Store bytes in the growarray. */ |
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31 ga_init2(&ga, 1, 4000); |
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32 json_encode_item(&ga, val, get_copyID()); |
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33 return ga.ga_data; |
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34 } |
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35 |
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36 static void |
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37 write_string(garray_T *gap, char_u *str) |
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38 { |
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39 char_u *res = str; |
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40 char_u numbuf[NUMBUFLEN]; |
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41 |
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42 if (res == NULL) |
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43 ga_concat(gap, (char_u *)"null"); |
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44 else |
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45 { |
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46 ga_append(gap, '"'); |
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47 while (*res != NUL) |
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48 { |
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49 int c = PTR2CHAR(res); |
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50 |
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51 switch (c) |
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52 { |
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53 case 0x08: |
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54 ga_append(gap, '\\'); ga_append(gap, 'b'); break; |
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55 case 0x09: |
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56 ga_append(gap, '\\'); ga_append(gap, 't'); break; |
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57 case 0x0a: |
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58 ga_append(gap, '\\'); ga_append(gap, 'n'); break; |
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59 case 0x0c: |
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60 ga_append(gap, '\\'); ga_append(gap, 'f'); break; |
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61 case 0x0d: |
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62 ga_append(gap, '\\'); ga_append(gap, 'r'); break; |
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63 case 0x22: /* " */ |
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64 case 0x5c: /* \ */ |
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65 ga_append(gap, '\\'); |
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66 ga_append(gap, c); |
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67 break; |
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68 default: |
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69 if (c >= 0x20) |
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70 { |
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71 #ifdef FEAT_MBYTE |
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72 numbuf[mb_char2bytes(c, numbuf)] = NUL; |
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73 #else |
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74 numbuf[0] = c; |
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75 numbuf[1] = NUL; |
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76 #endif |
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77 ga_concat(gap, numbuf); |
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78 } |
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79 else |
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80 { |
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81 vim_snprintf((char *)numbuf, NUMBUFLEN, |
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82 "\\u%04lx", (long)c); |
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83 ga_concat(gap, numbuf); |
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84 } |
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85 } |
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86 mb_cptr_adv(res); |
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87 } |
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88 ga_append(gap, '"'); |
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89 } |
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90 } |
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91 |
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92 /* |
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93 * Encode "val" into "gap". |
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94 * Return FAIL or OK. |
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95 */ |
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96 static int |
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97 json_encode_item(garray_T *gap, typval_T *val, int copyID) |
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98 { |
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99 char_u numbuf[NUMBUFLEN]; |
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100 char_u *res; |
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101 list_T *l; |
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102 dict_T *d; |
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103 |
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104 switch (val->v_type) |
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105 { |
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106 case VAR_SPECIAL: |
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107 switch (val->vval.v_number) |
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108 { |
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109 case VVAL_FALSE: ga_concat(gap, (char_u *)"false"); break; |
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110 case VVAL_TRUE: ga_concat(gap, (char_u *)"true"); break; |
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111 case VVAL_NONE: break; |
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112 case VVAL_NULL: ga_concat(gap, (char_u *)"null"); break; |
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113 } |
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114 break; |
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115 |
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116 case VAR_NUMBER: |
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117 vim_snprintf((char *)numbuf, NUMBUFLEN, "%ld", |
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118 (long)val->vval.v_number); |
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119 ga_concat(gap, numbuf); |
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120 break; |
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121 |
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122 case VAR_STRING: |
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123 res = val->vval.v_string; |
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124 write_string(gap, res); |
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125 break; |
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126 |
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127 case VAR_FUNC: |
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128 /* no JSON equivalent */ |
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129 EMSG(_(e_invarg)); |
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130 return FAIL; |
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131 |
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132 case VAR_LIST: |
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133 l = val->vval.v_list; |
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134 if (l == NULL) |
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135 ga_concat(gap, (char_u *)"null"); |
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136 else |
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137 { |
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138 if (l->lv_copyID == copyID) |
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139 ga_concat(gap, (char_u *)"[]"); |
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140 else |
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141 { |
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142 listitem_T *li; |
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143 |
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144 l->lv_copyID = copyID; |
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145 ga_append(gap, '['); |
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146 for (li = l->lv_first; li != NULL && !got_int; ) |
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147 { |
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148 if (json_encode_item(gap, &li->li_tv, copyID) == FAIL) |
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149 return FAIL; |
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150 li = li->li_next; |
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151 if (li != NULL) |
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152 ga_append(gap, ','); |
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153 } |
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154 ga_append(gap, ']'); |
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155 l->lv_copyID = 0; |
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156 } |
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157 } |
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158 break; |
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159 |
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160 case VAR_DICT: |
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161 d = val->vval.v_dict; |
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162 if (d == NULL) |
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163 ga_concat(gap, (char_u *)"null"); |
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164 else |
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165 { |
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166 if (d->dv_copyID == copyID) |
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167 ga_concat(gap, (char_u *)"{}"); |
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168 else |
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169 { |
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170 int first = TRUE; |
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171 int todo = (int)d->dv_hashtab.ht_used; |
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172 hashitem_T *hi; |
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173 |
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174 d->dv_copyID = copyID; |
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175 ga_append(gap, '{'); |
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176 |
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177 for (hi = d->dv_hashtab.ht_array; todo > 0 && !got_int; |
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178 ++hi) |
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179 if (!HASHITEM_EMPTY(hi)) |
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180 { |
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181 --todo; |
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182 if (first) |
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183 first = FALSE; |
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184 else |
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185 ga_append(gap, ','); |
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186 write_string(gap, hi->hi_key); |
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187 ga_append(gap, ':'); |
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188 if (json_encode_item(gap, &dict_lookup(hi)->di_tv, |
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189 copyID) == FAIL) |
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190 return FAIL; |
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191 } |
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192 ga_append(gap, '}'); |
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193 d->dv_copyID = 0; |
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194 } |
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195 } |
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196 break; |
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197 |
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198 #ifdef FEAT_FLOAT |
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199 case VAR_FLOAT: |
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200 vim_snprintf((char *)numbuf, NUMBUFLEN, "%g", val->vval.v_float); |
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201 ga_concat(gap, numbuf); |
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202 break; |
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203 #endif |
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204 default: EMSG2(_(e_intern2), "json_encode_item()"); break; |
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205 return FAIL; |
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206 } |
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207 return OK; |
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208 } |
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209 |
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210 /* |
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211 * Skip white space in "reader". |
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212 */ |
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213 static void |
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214 json_skip_white(js_read_T *reader) |
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215 { |
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216 int c; |
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217 |
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218 while ((c = reader->js_buf[reader->js_used]) == ' ' |
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219 || c == TAB || c == NL || c == CAR) |
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220 ++reader->js_used; |
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221 } |
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222 |
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223 /* |
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224 * Make sure there are at least enough characters buffered to read a number. |
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225 */ |
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226 static void |
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227 json_fill_buffer(js_read_T *reader UNUSED) |
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228 { |
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229 /* TODO */ |
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230 } |
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231 |
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232 static void |
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233 json_decode_array(js_read_T *reader, typval_T *res) |
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234 { |
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235 char_u *p; |
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236 typval_T item; |
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237 listitem_T *li; |
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238 |
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239 if (rettv_list_alloc(res) == FAIL) |
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240 goto failsilent; |
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241 ++reader->js_used; /* consume the '[' */ |
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242 |
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243 while (TRUE) |
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244 { |
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245 json_skip_white(reader); |
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246 p = reader->js_buf + reader->js_used; |
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247 if (*p == NUL) |
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248 goto fail; |
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249 if (*p == ']') |
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250 { |
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251 ++reader->js_used; /* consume the ']' */ |
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252 return; |
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253 } |
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254 |
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255 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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256 json_fill_buffer(reader); |
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257 |
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258 json_decode_item(reader, &item); |
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259 li = listitem_alloc(); |
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260 if (li == NULL) |
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261 return; |
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262 li->li_tv = item; |
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263 list_append(res->vval.v_list, li); |
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264 |
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265 json_skip_white(reader); |
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266 p = reader->js_buf + reader->js_used; |
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267 if (*p == ',') |
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268 ++reader->js_used; |
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269 else if (*p != ']') |
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270 goto fail; |
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271 } |
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272 fail: |
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273 EMSG(_(e_invarg)); |
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274 failsilent: |
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275 res->v_type = VAR_SPECIAL; |
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276 res->vval.v_number = VVAL_NONE; |
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277 } |
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278 |
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279 static void |
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280 json_decode_object(js_read_T *reader, typval_T *res) |
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281 { |
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282 char_u *p; |
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283 typval_T tvkey; |
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284 typval_T item; |
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285 dictitem_T *di; |
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286 char_u buf[NUMBUFLEN]; |
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287 char_u *key; |
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288 |
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289 if (rettv_dict_alloc(res) == FAIL) |
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290 goto failsilent; |
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291 ++reader->js_used; /* consume the '{' */ |
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292 |
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293 while (TRUE) |
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294 { |
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295 json_skip_white(reader); |
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296 p = reader->js_buf + reader->js_used; |
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297 if (*p == NUL) |
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298 goto fail; |
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299 if (*p == '}') |
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300 { |
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301 ++reader->js_used; /* consume the '}' */ |
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302 return; |
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303 } |
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304 |
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305 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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306 json_fill_buffer(reader); |
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307 json_decode_item(reader, &tvkey); |
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308 key = get_tv_string_buf_chk(&tvkey, buf); |
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309 if (key == NULL || *key == NUL) |
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310 { |
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311 /* "key" is NULL when get_tv_string_buf_chk() gave an errmsg */ |
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312 if (key != NULL) |
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313 EMSG(_(e_emptykey)); |
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314 clear_tv(&tvkey); |
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315 goto failsilent; |
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316 } |
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317 |
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318 json_skip_white(reader); |
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319 p = reader->js_buf + reader->js_used; |
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320 if (*p != ':') |
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321 { |
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322 clear_tv(&tvkey); |
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323 goto fail; |
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324 } |
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325 ++reader->js_used; |
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326 json_skip_white(reader); |
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327 |
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328 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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329 json_fill_buffer(reader); |
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330 json_decode_item(reader, &item); |
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331 |
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332 di = dictitem_alloc(key); |
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333 clear_tv(&tvkey); |
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334 if (di == NULL) |
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335 { |
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336 clear_tv(&item); |
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337 goto fail; |
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338 } |
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339 di->di_tv = item; |
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340 if (dict_add(res->vval.v_dict, di) == FAIL) |
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341 dictitem_free(di); |
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342 |
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343 json_skip_white(reader); |
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344 p = reader->js_buf + reader->js_used; |
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345 if (*p == ',') |
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346 ++reader->js_used; |
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347 else if (*p != '}') |
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348 goto fail; |
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349 } |
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350 fail: |
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351 EMSG(_(e_invarg)); |
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352 failsilent: |
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353 res->v_type = VAR_SPECIAL; |
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354 res->vval.v_number = VVAL_NONE; |
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355 } |
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356 |
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357 static void |
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358 json_decode_string(js_read_T *reader, typval_T *res) |
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359 { |
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360 garray_T ga; |
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361 int len; |
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362 char_u *p = reader->js_buf + reader->js_used + 1; |
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363 int c; |
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364 long nr; |
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365 char_u buf[NUMBUFLEN]; |
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366 |
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367 ga_init2(&ga, 1, 200); |
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368 |
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369 /* TODO: fill buffer when needed. */ |
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370 while (*p != NUL && *p != '"') |
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371 { |
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372 if (*p == '\\') |
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373 { |
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374 c = -1; |
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375 switch (p[1]) |
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376 { |
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377 case 'b': c = BS; break; |
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378 case 't': c = TAB; break; |
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379 case 'n': c = NL; break; |
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380 case 'f': c = FF; break; |
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381 case 'r': c = CAR; break; |
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382 case 'u': |
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383 vim_str2nr(p + 2, NULL, &len, |
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384 STR2NR_HEX + STR2NR_FORCE, &nr, NULL, 4); |
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385 p += len + 2; |
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386 #ifdef FEAT_MBYTE |
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387 buf[(*mb_char2bytes)((int)nr, buf)] = NUL; |
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388 ga_concat(&ga, buf); |
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389 #else |
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390 ga_append(&ga, nr); |
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391 #endif |
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392 break; |
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393 default: c = p[1]; break; |
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394 } |
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395 if (c > 0) |
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396 { |
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397 p += 2; |
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398 ga_append(&ga, c); |
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399 } |
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400 } |
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401 else |
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402 { |
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403 len = MB_PTR2LEN(p); |
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404 if (ga_grow(&ga, len) == OK) |
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405 { |
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406 mch_memmove((char *)ga.ga_data + ga.ga_len, p, (size_t)len); |
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407 ga.ga_len += len; |
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408 } |
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409 p += len; |
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410 } |
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411 if (!reader->js_eof && (int)(reader->js_end - p) < NUMBUFLEN) |
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412 { |
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413 reader->js_used = (int)(p - reader->js_buf); |
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414 json_fill_buffer(reader); |
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415 p = reader->js_buf + reader->js_used; |
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416 } |
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417 } |
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418 reader->js_used = (int)(p - reader->js_buf); |
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419 if (*p == '"') |
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420 { |
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421 ++reader->js_used; |
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422 res->v_type = VAR_STRING; |
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423 if (ga.ga_data == NULL) |
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424 res->vval.v_string = NULL; |
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425 else |
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426 res->vval.v_string = vim_strsave(ga.ga_data); |
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427 } |
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428 else |
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429 { |
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430 EMSG(_(e_invarg)); |
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431 res->v_type = VAR_SPECIAL; |
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432 res->vval.v_number = VVAL_NONE; |
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433 } |
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434 ga_clear(&ga); |
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435 } |
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436 |
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437 /* |
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438 * Decode one item and put it in "result". |
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439 * Must already have skipped white space. |
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440 */ |
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441 static void |
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442 json_decode_item(js_read_T *reader, typval_T *res) |
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443 { |
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444 char_u *p = reader->js_buf + reader->js_used; |
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445 |
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446 switch (*p) |
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447 { |
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448 case '[': /* array */ |
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449 json_decode_array(reader, res); |
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450 return; |
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451 |
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452 case '{': /* object */ |
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453 json_decode_object(reader, res); |
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454 return; |
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455 |
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456 case '"': /* string */ |
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457 json_decode_string(reader, res); |
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458 return; |
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459 |
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460 case ',': /* comma: empty item */ |
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461 case NUL: /* empty */ |
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462 res->v_type = VAR_SPECIAL; |
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463 res->vval.v_number = VVAL_NONE; |
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464 return; |
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465 |
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466 default: |
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467 if (VIM_ISDIGIT(*p) || *p == '-') |
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468 { |
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469 int len; |
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470 char_u *sp = p; |
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471 #ifdef FEAT_FLOAT |
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472 if (*sp == '-') |
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473 ++sp; |
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474 sp = skipdigits(sp); |
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475 if (*sp == '.' || *sp == 'e' || *sp == 'E') |
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476 { |
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477 res->v_type = VAR_FLOAT; |
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478 len = string2float(p, &res->vval.v_float); |
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479 } |
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480 else |
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481 #endif |
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482 { |
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483 long nr; |
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484 |
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485 res->v_type = VAR_NUMBER; |
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486 vim_str2nr(reader->js_buf + reader->js_used, |
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487 NULL, &len, 0, /* what */ |
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488 &nr, NULL, 0); |
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489 res->vval.v_number = nr; |
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490 } |
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491 reader->js_used += len; |
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492 return; |
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493 } |
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494 if (STRNICMP((char *)p, "false", 5) == 0) |
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495 { |
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496 reader->js_used += 5; |
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497 res->v_type = VAR_SPECIAL; |
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498 res->vval.v_number = VVAL_FALSE; |
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499 return; |
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500 } |
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501 if (STRNICMP((char *)p, "true", 4) == 0) |
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502 { |
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503 reader->js_used += 4; |
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504 res->v_type = VAR_SPECIAL; |
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505 res->vval.v_number = VVAL_TRUE; |
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506 return; |
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507 } |
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508 if (STRNICMP((char *)p, "null", 4) == 0) |
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509 { |
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510 reader->js_used += 4; |
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511 res->v_type = VAR_SPECIAL; |
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512 res->vval.v_number = VVAL_NULL; |
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513 return; |
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514 } |
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515 break; |
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516 } |
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517 |
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518 EMSG(_(e_invarg)); |
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519 res->v_type = VAR_SPECIAL; |
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520 res->vval.v_number = VVAL_NONE; |
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521 } |
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522 |
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523 /* |
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524 * Decode the JSON from "reader" and store the result in "res". |
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525 */ |
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526 void |
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527 json_decode(js_read_T *reader, typval_T *res) |
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528 { |
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529 json_skip_white(reader); |
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530 json_decode_item(reader, res); |
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531 json_skip_white(reader); |
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532 if (reader->js_buf[reader->js_used] != NUL) |
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533 EMSG(_(e_invarg)); |
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534 } |
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535 #endif |