package/jshn/files/jshn.sh

   1 [ -z "$N" ] && . /etc/functions.sh
   2
   3 # functions for parsing and generating json
   4
   5 json_init() {
   6         [ -n "$JSON_UNSET" ] && eval "unset $JSON_UNSET"
   7         export -- JSON_SEQ=0 JSON_STACK= JSON_CUR="JSON_VAR" JSON_UNSET=
   8 }
   9
  10 json_add_generic() {
  11         local type="$1"
  12         local var="$2"
  13         local val="$3"
  14         local cur="${4:-$JSON_CUR}"
  15
  16         export ${NO_EXPORT:+-n} -- "${cur}_$var=$val"
  17         export ${NO_EXPORT:+-n} -- "TYPE_${cur}_$var=$type"
  18         append JSON_UNSET "${cur}_$var TYPE_${cur}_$var"
  19         append "KEYS_${cur}" "$var"
  20 }
  21
  22 json_add_table() {
  23         JSON_SEQ=$(($JSON_SEQ + 1))
  24         append JSON_STACK "$JSON_CUR"
  25         local table="JSON_TABLE$JSON_SEQ"
  26         export ${NO_EXPORT:+-n} -- "UP_$table=$JSON_CUR"
  27         JSON_CUR="$table"
  28 }
  29
  30 json_add_object() {
  31         local cur="$JSON_CUR"
  32         json_add_table
  33         json_add_generic object "$1" "$JSON_CUR" "$cur"
  34 }
  35
  36 json_close_object() {
  37         local oldstack="$JSON_STACK"
  38         export "KEYS_${JSON_CUR}"
  39         JSON_CUR="${JSON_STACK##* }"
  40         JSON_STACK="${JSON_STACK% *}"
  41         [[ "$oldstack" == "$JSON_STACK" ]] && JSON_STACK=
  42 }
  43
  44 json_add_array() {
  45         local cur="$JSON_CUR"
  46         json_add_table
  47         json_add_generic array "$1" "$JSON_CUR" "$cur"
  48 }
  49
  50 json_close_array() {
  51         json_close_object
  52 }
  53
  54 json_add_string() {
  55         json_add_generic string "$1" "$2"
  56 }
  57
  58 json_add_int() {
  59         json_add_generic int "$1" "$2"
  60 }
  61
  62 json_add_boolean() {
  63         json_add_generic boolean "$1" "$2"
  64 }
  65
  66 # functions read access to json variables
  67
  68 json_load() {
  69         eval `jshn -r "$1"`
  70 }
  71
  72 json_dump() {
  73         jshn -w
  74 }
  75
  76 json_get_type() {
  77         local dest="$1"
  78         local var="$2"
  79         eval "export ${NO_EXPORT:+-n} -- \"$dest=\${TYPE_${JSON_CUR}_$var}\""
  80 }
  81
  82 json_get_var() {
  83         local dest="$1"
  84         local var="$2"
  85         eval "export ${NO_EXPORT:+-n} -- \"$dest=\${${JSON_CUR}_$var}\""
  86 }
  87
  88 json_select() {
  89         local target="$1"
  90         local type
  91
  92         [ -z "$1" ] && {
  93                 JSON_CUR="JSON_VAR"
  94                 return
  95         }
  96         [[ "$1" == ".." ]] && {
  97                 eval "JSON_CUR=\"\${UP_$JSON_CUR}\""
  98                 return;
  99         }
 100         json_get_type type "$target"
 101         case "$type" in
 102                 object|array)
 103                         json_get_var JSON_CUR "$target"
 104                 ;;
 105                 *)
 106                         echo "WARNING: Variable '$target' does not exist or is not an array/object"
 107                 ;;
 108         esac
 109 }