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make JSON.sh into one self contained script

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commit 8a954c0b4c3cc28a08f3dc51efead39f167a0ca6 1 parent 39d3385
@dominictarr authored
Showing with 102 additions and 0 deletions.
  1. +102 −0 JSON.sh
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102 JSON.sh
@@ -0,0 +1,102 @@
+
+throw () {
+ echo "$*" >&2
+ exit 1
+}
+
+tokenize () {
+ local ESCAPE='(\\[^u[:cntrl:]]|\\u[0-9a-fA-F]{4})'
+ local CHAR='[^[:cntrl:]"\\]'
+ local STRING="\"$CHAR*($ESCAPE$CHAR*)*\""
+ local NUMBER='-?(0|[1-9][0-9]*)([.][0-9]*)?([eE][+-]?[0-9]*)?'
+ local KEYWORD='null|false|true'
+ local SPACE='[[:space:]]+'
+ egrep -ao "$STRING|$NUMBER|$KEYWORD|$SPACE|." --color=never |
+ egrep -v "^$SPACE$" # eat whitespace
+}
+
+parse_array () {
+ local index=0
+ local ary=''
+ read -r token
+ case "$token" in
+ ']') ;;
+ *)
+ while :
+ do
+ parse_value "$1" "$index"
+ let index=$index+1
+ ary="$ary""$value"
+ read -r token
+ case "$token" in
+ ']') break ;;
+ ',') ary="$ary," ;;
+ *) throw "EXPECTED , or ] GOT ${token:-EOF}" ;;
+ esac
+ read -r token
+ done
+ ;;
+ esac
+ value=`printf '[%s]' $ary`
+}
+
+parse_object () {
+ local key
+ local obj=''
+ read -r token
+ case "$token" in
+ '}') ;;
+ *)
+ while :
+ do
+ case "$token" in
+ '"'*'"') key=$token ;;
+ *) throw "EXPECTED string GOT ${token:-EOF}" ;;
+ esac
+ read -r token
+ case "$token" in
+ ':') ;;
+ *) throw "EXPECTED : GOT ${token:-EOF}" ;;
+ esac
+ read -r token
+ parse_value "$1" "$key"
+ obj="$obj$key:$value"
+ read -r token
+ case "$token" in
+ '}') break ;;
+ ',') obj="$obj," ;;
+ *) throw "EXPECTED , or } GOT ${token:-EOF}" ;;
+ esac
+ read -r token
+ done
+ ;;
+ esac
+ value=`printf '{%s}' "$obj"`
+}
+
+parse_value () {
+ local jpath="${1:+$1,}$2"
+ case "$token" in
+ '{') parse_object "$jpath" ;;
+ '[') parse_array "$jpath" ;;
+ # At this point, the only valid single-character tokens are digits.
+ ''|[^0-9]) throw "EXPECTED value GOT ${token:-EOF}" ;;
+ *) value=$token ;;
+ esac
+ printf "[%s]\t%s\n" "$jpath" "$value"
+}
+
+parse () {
+ read -r token
+ parse_value
+ read -r token
+ case "$token" in
+ '') ;;
+ *) throw "EXPECTED EOF GOT $token" ;;
+ esac
+}
+
+if [ $0 = $BASH_SOURCE ];
+then
+ tokenize | parse
+fi
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