basic json parser in pure bash

gaboshlib/g_json.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+# thanks to dylanaraps - https://github.com/dylanaraps/nosj
+
+# function g_json gives back the associative array $g_json
+# parsed json by stdin or file in $1
+#
+# To get keys use: ${!g_json[@]}
+# To get values use ${g_json[@]}
+# To get specifi key use ${g_json[keyname]}
+
+function g_json {
+  IFS= g_json_tokenize < "${1:-/dev/stdin}"
+  IFS= g_json_parse
+}
+
+function g_json_tokenize {
+  local j str
+  while read -rN 1; do
+    case $REPLY in
+      [\{\}\[\],])
+        [[ $str ]] && j+=$REPLY
+        [[ $str ]] || { tokens+=("$j" "$REPLY"); j=; }
+      ;;
+      :)
+        [[ $str ]] && j+=:
+        [[ $str ]] || j+='\ '
+      ;;
+         [[:space:]])
+         [[ $str ]] && j+=$REPLY
+      ;;
+         [\"\'])
+         [[ $str ]] && str= || str=1
+         [[ ${j: -1} == \\ ]] && { str=1; j+=$REPLY; }
+       ;;
+       *) j+=$REPLY ;;
+     esac
+  done
+}
+
+function g_json_parse {
+  local i key key_plain objects o val out
+  declare -Ag g_json
+  for ((i=0;i<${#tokens[@]};i++)) {
+    case ${tokens[i]} in
+      \{|\[)
+        objects+=("${tokens[i-1]}")
+      ;;
+      \}|\])
+        unset 'objects[-1]'
+      ;;
+      *\\\ *)
+        key=${objects[*]//\\ /.}${tokens[i]/\\ *}
+        key_plain=index_${key//[^A-Za-z0-9]/_}
+        val=${tokens[i]/*\\ }
+        if [[ -n ${g_json[$key]} ]]
+        then
+          [[ -n ${g_json[${key}[0]]} ]] || {
+            g_json["${key}[0]"]=${g_json[$key]}
+            printf -v o 'g_json[%q]=%q' "${key}[0]" "${g_json[$key]}"
+            out+=("$o")
+          }
+          declare -i "$key_plain+=1"
+          printf -v o 'g_json[%q]=%q' "${key}[${!key_plain}]" "$val"
+          out+=("$o")
+        elif [[ $val ]]; then
+          g_json["$key"]=$val
+          printf -v o 'g_json[%q]=%q' "$key" "$val"
+          out+=("$o")
+        fi
+      ;;
+    esac
+  }
+}
+
+g_json /tmp/json
+