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|
# functions for parsing and generating json
_json_get_var() {
local ___dest="$1"
local ___var="$2"
eval "$___dest=\"\$${JSON_PREFIX}$___var\""
}
_json_set_var() {
local ___var="$1"
local ___val="$2"
eval "${JSON_PREFIX}$___var=\"\$___val\""
}
_jshn_append() {
local __var="$1"
local __value="$2"
local __sep="${3:- }"
local __old_val
_json_get_var __old_val "$__var"
__value="${__old_val:+$__old_val$__sep}$__value"
_json_set_var "$__var" "$__value"
}
_json_export() {
local __var="${JSON_PREFIX}$1"
local __val="$2"
export -- "$__var=$__val"
_jshn_append "JSON_UNSET" "$__var"
}
_json_add_key() {
local table="$1"
local var="$2"
_jshn_append "KEYS_${table}" "$var"
}
_get_var() {
local __dest="$1"
local __var="$2"
eval "$__dest=\"\$$__var\""
}
_set_var() {
local __var="$1"
local __val="$2"
eval "$__var=\"\$__val\""
}
_json_inc() {
local _var="$1"
local _dest="$2"
local _seq
_json_get_var _seq "$_var"
_seq="$((${_seq:-0} + 1))"
_json_set_var "$_var" "$_seq"
[ -n "$_dest" ] && _set_var "$_dest" "$_seq"
}
_json_stack_push() {
local new_cur="$1"
local cur
_json_get_var cur JSON_CUR
_jshn_append JSON_STACK "$cur"
_json_set_var JSON_CUR "$new_cur"
}
_json_add_generic() {
local type="$1"
local var="$2"
local val="$3"
local cur="$4"
[ -n "$cur" ] || _json_get_var cur JSON_CUR
if [ "${cur%%[0-9]*}" = "JSON_ARRAY" ]; then
_json_inc "SEQ_$cur" var
else
local name="${var//[^a-zA-Z0-9_]/_}"
[[ "$name" == "$var" ]] || _json_export "NAME_${cur}_${name}" "$var"
var="$name"
fi
_json_export "${cur}_$var" "$val"
_json_export "TYPE_${cur}_$var" "$type"
_json_add_key "$cur" "$var"
}
_json_add_table() {
local name="$1"
local type="$2"
local itype="$3"
local cur new_cur
local seq
_json_get_var cur JSON_CUR
_json_inc JSON_SEQ seq
local table="JSON_$itype$seq"
_json_export "UP_$table" "$cur"
_json_export "KEYS_$table" ""
[ "$TYPE" = "ARRAY" ] && _json_export "SEQ_$table" ""
_json_stack_push "$table"
_json_get_var new_cur JSON_CUR
_json_add_generic "$type" "$1" "$new_cur" "$cur"
}
_json_close_table() {
local stack new_stack
_json_get_var stack JSON_STACK
_json_set_var JSON_CUR "${stack##* }"
new_stack="${stack% *}"
[[ "$stack" == "$new_stack" ]] && new_stack=
_json_set_var JSON_STACK "$new_stack"
}
json_set_namespace() {
local _new="$1"
local _old="$2"
[ -n "$_old" ] && _set_var "$_old" "$JSON_PREFIX"
JSON_PREFIX="$_new"
}
json_cleanup() {
local unset
_json_get_var unset JSON_UNSET
[ -n "$unset" ] && eval "unset $unset"
unset \
${JSON_PREFIX}JSON_SEQ \
${JSON_PREFIX}JSON_STACK \
${JSON_PREFIX}JSON_CUR \
${JSON_PREFIX}JSON_UNSET \
${JSON_PREFIX}KEYS_JSON_VAR \
${JSON_PREFIX}TYPE_JSON_VAR
}
json_init() {
json_cleanup
export -- \
${JSON_PREFIX}JSON_SEQ=0 \
${JSON_PREFIX}JSON_STACK= \
${JSON_PREFIX}JSON_CUR="JSON_VAR" \
${JSON_PREFIX}JSON_UNSET="" \
${JSON_PREFIX}KEYS_JSON_VAR= \
${JSON_PREFIX}TYPE_JSON_VAR=
}
json_add_object() {
_json_add_table "$1" object TABLE
}
json_close_object() {
_json_close_table
}
json_add_array() {
_json_add_table "$1" array ARRAY
}
json_close_array() {
_json_close_table
}
json_add_string() {
_json_add_generic string "$1" "$2"
}
json_add_int() {
_json_add_generic int "$1" "$2"
}
json_add_boolean() {
_json_add_generic boolean "$1" "$2"
}
# functions read access to json variables
json_load() {
eval `jshn -r "$1"`
}
json_dump() {
jshn "$@" ${JSON_PREFIX:+-p "$JSON_PREFIX"} -w
}
json_get_type() {
local dest="$1"
local cur
_json_get_var cur JSON_CUR
local var="${JSON_PREFIX}TYPE_${cur}_$2"
eval "export -- \"$dest=\${$var}\"; [ -n \"\${$var+x}\" ]"
}
json_get_var() {
local __dest="$1"
local __cur
_json_get_var __cur JSON_CUR
local __var="${JSON_PREFIX}${__cur}_${2//[^a-zA-Z0-9_]/_}"
eval "export -- \"$__dest=\${$__var}\"; [ -n \"\${$__var+x}\" ]"
}
json_get_vars() {
while [ "$#" -gt 0 ]; do
local _var="$1"; shift
json_get_var "$_var" "$_var"
done
}
json_select() {
local target="$1"
local type
local cur
[ -z "$1" ] && {
_json_set_var JSON_CUR "JSON_VAR"
return 0
}
[[ "$1" == ".." ]] && {
_json_get_var cur JSON_CUR
_json_get_var cur "UP_$cur"
_json_set_var JSON_CUR "$cur"
return 0
}
json_get_type type "$target"
case "$type" in
object|array)
json_get_var cur "$target"
_json_set_var JSON_CUR "$cur"
;;
*)
echo "WARNING: Variable '$target' does not exist or is not an array/object"
return 1
;;
esac
}
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