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#!/usr/bin/env bash
throw () {
echo "$*" >&2
exit 1
}
BRIEF=0
LEAFONLY=0
PRUNE=0
NORMALIZE_SOLIDUS=0
usage() {
echo
echo "Usage: JSON.sh [-b] [-l] [-p] [-s] [-h]"
echo
echo "-p - Prune empty. Exclude fields with empty values."
echo "-l - Leaf only. Only show leaf nodes, which stops data duplication."
echo "-b - Brief. Combines 'Leaf only' and 'Prune empty' options."
echo "-s - Remove escaping of the solidus symbol (stright slash)."
echo "-h - This help text."
echo
}
parse_options() {
set -- "$@"
local ARGN=$#
while [ "$ARGN" -ne 0 ]
do
case $1 in
-h) usage
exit 0
;;
-b) BRIEF=1
LEAFONLY=1
PRUNE=1
;;
-l) LEAFONLY=1
;;
-p) PRUNE=1
;;
-s) NORMALIZE_SOLIDUS=1
;;
?*) echo "ERROR: Unknown option."
usage
exit 0
;;
esac
shift 1
ARGN=$((ARGN-1))
done
}
awk_egrep () {
local pattern_string=$1
gawk '{
while ($0) {
start=match($0, pattern);
token=substr($0, start, RLENGTH);
print token;
$0=substr($0, start+RLENGTH);
}
}' pattern="$pattern_string"
}
tokenize () {
local GREP
local ESCAPE
local CHAR
if echo "test string" | egrep -ao --color=never "test" &>/dev/null
then
GREP='egrep -ao --color=never'
else
GREP='egrep -ao'
fi
if echo "test string" | egrep -o "test" &>/dev/null
then
ESCAPE='(\\[^u[:cntrl:]]|\\u[0-9a-fA-F]{4})'
CHAR='[^[:cntrl:]"\\]'
else
GREP=awk_egrep
ESCAPE='(\\\\[^u[:cntrl:]]|\\u[0-9a-fA-F]{4})'
CHAR='[^[:cntrl:]"\\\\]'
fi
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:]]+'
$GREP "$STRING|$NUMBER|$KEYWORD|$SPACE|." | egrep -v "^$SPACE$"
}
parse_array () {
local index=0
local ary=''
read -r token
case "$token" in
']') ;;
*)
while :
do
parse_value "$1" "$index"
index=$((index+1))
ary="$ary""$value"
read -r token
case "$token" in
']') break ;;
',') ary="$ary," ;;
*) throw "EXPECTED , or ] GOT ${token:-EOF}" ;;
esac
read -r token
done
;;
esac
[ "$BRIEF" -eq 0 ] && value=$(printf '[%s]' "$ary") || value=
:
}
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 ${token:-EOF}" ;;
esac
read -r token
done
;;
esac
[ "$BRIEF" -eq 0 ] && value=$(printf '{%s}' "$obj") || value=
:
}
parse_value () {
local jpath="${1:+$1,}$2" isleaf=0 isempty=0 print=0
case "$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
# if asked, replace solidus ("\/") in json strings with normalized value: "/"
[ "$NORMALIZE_SOLIDUS" -eq 1 ] && value=${value//\\\//\/}
isleaf=1
[ "$value" = '""' ] && isempty=1
;;
esac
[ "$value" = '' ] && return
[ "$LEAFONLY" -eq 0 ] && [ "$PRUNE" -eq 0 ] && print=1
[ "$LEAFONLY" -eq 1 ] && [ "$isleaf" -eq 1 ] && [ $PRUNE -eq 0 ] && print=1
[ "$LEAFONLY" -eq 0 ] && [ "$PRUNE" -eq 1 ] && [ "$isempty" -eq 0 ] && print=1
[ "$LEAFONLY" -eq 1 ] && [ "$isleaf" -eq 1 ] && \
[ $PRUNE -eq 1 ] && [ $isempty -eq 0 ] && print=1
[ "$print" -eq 1 ] && 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" ] || ! [ -n "$BASH_SOURCE" ]);
then
parse_options "$@"
tokenize | parse
fi
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