[LEDE-DEV] [PATCH libubox] sh/jshn.sh: add json_for_each_item()

[Hans Dedecker]

Function usefull to iterate through the different elements of an
array or object; the provided callback function is called for each
value.
For field types different from array or object the callback is called
with the retrieved value.

Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 sh/jshn.sh | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/sh/jshn.sh b/sh/jshn.sh
index bf76edb..aa2e868 100644
--- a/sh/jshn.sh
+++ b/sh/jshn.sh
@@ -278,3 +278,30 @@ json_is_a() {
 	json_get_type type "$1"
 	[ "$type" = "$2" ]
 }
+
+json_for_each_item() {
+	[ "$#" -ge 2 ] || return 0
+	local function="$1"; shift
+	local target="$1"; shift
+	local type
+	local val
+
+	json_get_type type "$target"
+	case "$type" in
+		object|array)
+			local keys
+			local key
+			json_select "$target"
+			json_get_keys keys
+			for key in $keys; do
+				json_get_var val "$key"
+				eval "$function \"\$val\" \"\$@\""
+			done
+			json_select ..
+		;;
+		*)
+			json_get_var val "$target"
+			eval "$function \"\$val\" \"\$@\""
+		;;
+	esac
+}
-- 
2.15.1