sh/jshn.sh

   1 # functions for parsing and generating json
   2
   3 _json_get_var() {
   4         # dest=$1
   5         # var=$2
   6         eval "$1=\"\$${JSON_PREFIX}$2\""
   7 }
   8
   9 _json_set_var() {
  10         # var=$1
  11         local ___val="$2"
  12         eval "${JSON_PREFIX}$1=\"\$___val\""
  13 }
  14
  15 __jshn_raw_append() {
  16         # var=$1
  17         local value="$2"
  18         local sep="${3:- }"
  19
  20         eval "export -- \"$1=\${$1:+\${$1}\${value:+\$sep}}\$value\""
  21 }
  22
  23 _jshn_append() {
  24         # var=$1
  25         local _a_value="$2"
  26         eval "${JSON_PREFIX}$1=\"\${${JSON_PREFIX}$1} \$_a_value\""
  27 }
  28
  29 _get_var() {
  30         # var=$1
  31         # value=$2
  32         eval "$1=\"\$$2\""
  33 }
  34
  35 _set_var() {
  36         # var=$1
  37         local __val="$2"
  38         eval "$1=\"\$__val\""
  39 }
  40
  41 _json_inc() {
  42         # var=$1
  43         # dest=$2
  44
  45         eval "${JSON_PREFIX}$1=\$(( \${${JSON_PREFIX}$1:-0} + 1))${2:+; $2=\"\$${JSON_PREFIX}$1\"}"
  46 }
  47
  48 _json_add_generic() {
  49         # type=$1
  50         # name=$2
  51         # value=$3
  52         # cur=$4
  53
  54         local var
  55         if [ "${4%%[0-9]*}" = "JSON_ARRAY" ]; then
  56                 _json_inc "SEQ_$4" var
  57         else
  58                 local name="${2//[^a-zA-Z0-9_]/_}"
  59                 [[ "$name" == "$2" ]] || export -- "${JSON_PREFIX}NAME_${4}_${name}=$2"
  60                 var="$name"
  61         fi
  62
  63         local cur_var=
  64         export -- \
  65                 "${JSON_PREFIX}${4}_$var=$3" \
  66                 "${JSON_PREFIX}TYPE_${4}_$var=$1"
  67         _jshn_append "JSON_UNSET" "${4}_$var"
  68         _jshn_append "KEYS_$4" "$var"
  69 }
  70
  71 _json_add_table() {
  72         # name=$1
  73         # type=$2
  74         # itype=$3
  75         local cur seq
  76
  77         _json_get_var cur JSON_CUR
  78         _json_inc JSON_SEQ seq
  79
  80         local table="JSON_$3$seq"
  81         _json_set_var "UP_$table" "$cur"
  82         export -- "${JSON_PREFIX}KEYS_$table="
  83         unset "${JSON_PREFIX}SEQ_$table"
  84         _json_set_var JSON_CUR "$table"
  85         _jshn_append "JSON_UNSET" "$table"
  86
  87         _json_add_generic "$2" "$1" "$table" "$cur"
  88 }
  89
  90 _json_close_table() {
  91         local _s_cur
  92
  93         _json_get_var _s_cur JSON_CUR
  94         _json_get_var "${JSON_PREFIX}JSON_CUR" "UP_$_s_cur"
  95 }
  96
  97 json_set_namespace() {
  98         local _new="$1"
  99         local _old="$2"
 100
 101         [ -n "$_old" ] && _set_var "$_old" "$JSON_PREFIX"
 102         JSON_PREFIX="$_new"
 103 }
 104
 105 json_cleanup() {
 106         local unset tmp
 107
 108         _json_get_var unset JSON_UNSET
 109         for tmp in $unset JSON_VAR; do
 110                 unset \
 111                         ${JSON_PREFIX}UP_$tmp \
 112                         ${JSON_PREFIX}KEYS_$tmp \
 113                         ${JSON_PREFIX}SEQ_$tmp \
 114                         ${JSON_PREFIX}TYPE_$tmp \
 115                         ${JSON_PREFIX}NAME_$tmp \
 116                         ${JSON_PREFIX}$tmp
 117         done
 118
 119         unset \
 120                 ${JSON_PREFIX}JSON_SEQ \
 121                 ${JSON_PREFIX}JSON_CUR \
 122                 ${JSON_PREFIX}JSON_UNSET
 123 }
 124
 125 json_init() {
 126         json_cleanup
 127         export -- \
 128                 ${JSON_PREFIX}JSON_SEQ=0 \
 129                 ${JSON_PREFIX}JSON_CUR="JSON_VAR" \
 130                 ${JSON_PREFIX}KEYS_JSON_VAR= \
 131                 ${JSON_PREFIX}TYPE_JSON_VAR=
 132 }
 133
 134 json_add_object() {
 135         _json_add_table "$1" object TABLE
 136 }
 137
 138 json_close_object() {
 139         _json_close_table
 140 }
 141
 142 json_add_array() {
 143         _json_add_table "$1" array ARRAY
 144 }
 145
 146 json_close_array() {
 147         _json_close_table
 148 }
 149
 150 json_add_string() {
 151         local cur
 152         _json_get_var cur JSON_CUR
 153         _json_add_generic string "$1" "$2" "$cur"
 154 }
 155
 156 json_add_int() {
 157         local cur
 158         _json_get_var cur JSON_CUR
 159         _json_add_generic int "$1" "$2" "$cur"
 160 }
 161
 162 json_add_boolean() {
 163         local cur
 164         _json_get_var cur JSON_CUR
 165         _json_add_generic boolean "$1" "$2" "$cur"
 166 }
 167
 168 json_add_double() {
 169         local cur
 170         _json_get_var cur JSON_CUR
 171         _json_add_generic double "$1" "$2" "$cur"
 172 }
 173
 174 # functions read access to json variables
 175
 176 json_load() {
 177         eval "`jshn -r "$1"`"
 178 }
 179
 180 json_dump() {
 181         jshn "$@" ${JSON_PREFIX:+-p "$JSON_PREFIX"} -w
 182 }
 183
 184 json_get_type() {
 185         local __dest="$1"
 186         local __cur
 187
 188         _json_get_var __cur JSON_CUR
 189         local __var="${JSON_PREFIX}TYPE_${__cur}_${2//[^a-zA-Z0-9_]/_}"
 190         eval "export -- \"$__dest=\${$__var}\"; [ -n \"\${$__var+x}\" ]"
 191 }
 192
 193 json_get_keys() {
 194         local __dest="$1"
 195         local _tbl_cur
 196
 197         if [ -n "$2" ]; then
 198                 json_get_var _tbl_cur "$2"
 199         else
 200                 _json_get_var _tbl_cur JSON_CUR
 201         fi
 202         local __var="${JSON_PREFIX}KEYS_${_tbl_cur}"
 203         eval "export -- \"$__dest=\${$__var}\"; [ -n \"\${$__var+x}\" ]"
 204 }
 205
 206 json_get_values() {
 207         local _v_dest="$1"
 208         local _v_keys _v_val _select=
 209         local _json_no_warning=1
 210
 211         unset "$_v_dest"
 212         [ -n "$2" ] && {
 213                 json_select "$2" || return 1
 214                 _select=1
 215         }
 216
 217         json_get_keys _v_keys
 218         set -- $_v_keys
 219         while [ "$#" -gt 0 ]; do
 220                 json_get_var _v_val "$1"
 221                 __jshn_raw_append "$_v_dest" "$_v_val"
 222                 shift
 223         done
 224         [ -n "$_select" ] && json_select ..
 225
 226         return 0
 227 }
 228
 229 json_get_var() {
 230         local __dest="$1"
 231         local __cur
 232
 233         _json_get_var __cur JSON_CUR
 234         local __var="${JSON_PREFIX}${__cur}_${2//[^a-zA-Z0-9_]/_}"
 235         eval "export -- \"$__dest=\${$__var:-$3}\"; [ -n \"\${$__var+x}\${3+x}\" ]"
 236 }
 237
 238 json_get_vars() {
 239         while [ "$#" -gt 0 ]; do
 240                 local _var="$1"; shift
 241                 if [ "$_var" != "${_var#*:}" ]; then
 242                         json_get_var "${_var%%:*}" "${_var%%:*}" "${_var#*:}"
 243                 else
 244                         json_get_var "$_var" "$_var"
 245                 fi
 246         done
 247 }
 248
 249 json_select() {
 250         local target="$1"
 251         local type
 252         local cur
 253
 254         [ -z "$1" ] && {
 255                 _json_set_var JSON_CUR "JSON_VAR"
 256                 return 0
 257         }
 258         [[ "$1" == ".." ]] && {
 259                 _json_get_var cur JSON_CUR
 260                 _json_get_var cur "UP_$cur"
 261                 _json_set_var JSON_CUR "$cur"
 262                 return 0
 263         }
 264         json_get_type type "$target"
 265         case "$type" in
 266                 object|array)
 267                         json_get_var cur "$target"
 268                         _json_set_var JSON_CUR "$cur"
 269                 ;;
 270                 *)
 271                         [ -n "$_json_no_warning" ] || \
 272                                 echo "WARNING: Variable '$target' does not exist or is not an array/object"
 273                         return 1
 274                 ;;
 275         esac
 276 }
 277
 278 json_is_a() {
 279         local type
 280
 281         json_get_type type "$1"
 282         [ "$type" = "$2" ]
 283 }