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67 lines
1.8 KiB
67 lines
1.8 KiB
2 years ago
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#!/bin/sh
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# A POSIX compatible JSON parser within 60 lines of code (without comments)
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# Usage example:
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# $ echo '{ "key1" : { "key2": {}, "key3": [null, true, false, "value"]}}' | ./poorjson.sh '"key1"' '"key3"' 3
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# $ "value"
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# shellcheck disable=SC2015
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__JNUM='\(-\?\(0\|[1-9][0-9]*\)\(\.[0-9]\+\)\?\([eE][+-]\?[0-9]\+\)\?\)'
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__JSTR='\("\([^[:cntrl:]"]\|\\["\\\/bfnrt]\|u[0-9]{4}\)*"\)'
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_TOKEN="" _TMP="" __JTOK="$__JSTR\|$__JNUM\|true\|false\|null\|[][}{,:]"
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_is_match() { [ "$1" = "$2" ] || [ "$1" = \* ] || [ "$1" = . ]; }
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_eof_error() { echo "Unexpected EOF after \"$_TOKEN\""; exit 1; }
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_token_error() { echo "Unexpected token \"$_TOKEN\""; exit 1; }
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_jread() {
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read -r _TOKEN || _eof_error
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[ "$1" = . ] && echo "$_TOKEN"
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}
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_jarr() {
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if _is_match "$1" 0; then _jval "$@"; else _jval; fi || {
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[ "$_TOKEN" = ']' ] && return || _token_error
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}
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while :; do
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_jread "$1";
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case $_TOKEN in "]") return 0;;
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",") [ "$1" -ge 0 ] 2>/dev/null && _TMP=$(( $1 - 1)) && shift && set -- "$_TMP" "$@";;
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*) _token_error;;
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esac
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if _is_match "$1" 0; then _jval "$@"; else _jval; fi || _token_error
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done
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}
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_jobj() {
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_jread "$1"; [ "$_TOKEN" = "}" ] && return 0
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while :; do
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_TMP=$_TOKEN
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case $_TMP in '"'*'"')
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_jread "$1"
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[ "$_TOKEN" = ":" ] || _token_error
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if _is_match "$1" "$_TMP"; then _jval "$@"; else _jval; fi || _token_error
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_jread "$1"
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[ "$_TOKEN" = "}" ] && return 0
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[ "$_TOKEN" != "," ] && _token_error
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_jread "$1"
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continue
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;;
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esac
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_token_error
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done
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}
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_jval() {
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[ "$#" -eq 0 ] || [ "$*" = . ] || shift
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_jread "$1"
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case $_TOKEN in '{') _jobj "$@";;
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"[") _jarr "$@";;
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true|false|null|-*|[0-9]*|'"'*'"') [ "$1" = \* ] && echo "$_TOKEN"; :;;
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*) return 1;;
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esac
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}
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sed -e "s/\($__JTOK\)/\n\1\n/g" | sed -e "/^\s*$/d;/$__JTOK/!{q255};" | { _jval "" "$@" . && ! read -r; } || {
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echo "JSON string invalid."
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exit 1
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}
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