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|
#!/bin/bash
gron() {
set -e
LC_ALL='C.UTF-8'
local gron_prefix='json'
local gron_str
gron_str="$(cat)"
_gron_value
}
_gron_error() {
printf 'unexpected character: %q\n' "${gron_str::1}" >&2
return 1
}
_gron_expect() {
if [[ "${gron_str::1}" != "$1" ]]; then
_gron_error
fi
gron_str=${gron_str:1}
}
_gron_ws() {
while [[ "${gron_str::1}" == [$' \t\n\r'] ]]; do
gron_str=${gron_str:1}
done
}
_gron_value() {
_gron_ws
case "${gron_str::1}" in
'{' ) _gron_object ;;
'[' ) _gron_array ;;
'"' ) _gron_string ;;
't' ) _gron_lit 'true' ;;
'f' ) _gron_lit 'false' ;;
'n' ) _gron_lit 'null' ;;
[-+0-9] ) _gron_number ;;
* ) _gron_error ;;
esac
}
_gron_object() {
printf '%s={}\n' "$gron_prefix"
local gron_base_prefix=$gron_prefix
_gron_expect '{'
_gron_ws
case "${gron_str::1}" in
'"' )
local k
while true; do
_gron_read_string k
gron_prefix="${gron_base_prefix}[${k@Q}]"
_gron_ws
_gron_expect ':'
_gron_value
_gron_ws
case "${gron_str::1}" in
',' )
gron_str=${gron_str:1}
_gron_ws
;;
'}' )
gron_str=${gron_str:1}
return
;;
esac
done
;;
'}' )
gron_str=${gron_str:1}
return
;;
esac
}
_gron_array() {
printf '%s=[]\n' "$gron_prefix"
local gron_base_prefix=$gron_prefix
_gron_expect '['
_gron_ws
if [[ "${gron_str::1}" == ']' ]]; then
return
fi
local i
for ((i = 0; 1; i++)); do
gron_prefix="${gron_base_prefix}[${i}]"
_gron_value
_gron_ws
case "${gron_str::1}" in
',' )
gron_str=${gron_str:1}
_gron_ws
;;
']' )
gron_str=${gron_str:1}
return
;;
esac
done
}
_gron_read_string() {
_gron_expect '"'
local v
while true; do
case "${gron_str::1}" in
"\\" )
gron_str=${gron_str:1}
case "${gron_str::1}" in
'"' ) v+='"'; gron_str=${gron_str:1} ;;
"\\" ) v+="\\"; gron_str=${gron_str:1} ;;
'/' ) v+='/'; gron_str=${gron_str:1} ;;
'b' ) v+=$'\b'; gron_str=${gron_str:1} ;;
'f' ) v+=$'\f'; gron_str=${gron_str:1} ;;
'n' ) v+=$'\n'; gron_str=${gron_str:1} ;;
'r' ) v+=$'\r'; gron_str=${gron_str:1} ;;
't' ) v+=$'\t'; gron_str=${gron_str:1} ;;
'u' )
if ! [[ ${gron_str::5} == u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] ]]; then
_gron_error
fi
c="$(printf "\\${gron_str::5}")"
n="0x${gron_str:1:4}"
gron_str=${gron_str:5}
if (( 0xDC00 <= n && n <= 0xDFFF )); then
if ! [[ ${gron_str::6} == '\u'[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] ]]; then
_gron_error
fi
n2="0x${gron_str:2:4}"
gron_str=${gron_str:6}
gron_str=${gron_str:5}
if ! (( 0xD800 <= n2 && n2 <= 0xDBFF )); then
_gron_error
fi
n=$(( 0x10000 + ((n-0xDC00)<<10) + (n2-0xD8000) ))
printf -v n '0x%08' "$n"
printf -v c "\\U$n"
fi
v+="$c"
;;
*) _gron_error ;;
esac
;;
'"' )
gron_str=${gron_str:1}
printf -v "$1" "$v"
;;
* )
# Consume multiple characters at once,
# or else this is horribly slow.
local re='^[^\"]+'
[[ $gron_str =~ $re ]]
v+=${BASH_REMATCH[1]}
gron_str=${gron_str#"${BASH_REMATCH[1]}"}
;;
esac
done
}
_gron_string() {
local v
_gron_read_string v
printf '%s=%q\n' "$gron_prefix" "$v"
}
_gron_number() {
local re='^-?(0|[1-9][0-9]+)(\.[0-9]+)?([eE][-+]?[0-9]+)?'
if ! [[ $gron_str =~ $re ]]; then
_gron_error
fi
gron_str=${gron_str#"${BASH_REMATCH[1]}"}
printf '%s=%s\n' "$gron_prefix" "${BASH_REMATCH[1]}"
}
_gron_lit() {
if [[ ${gron_str::${#1}} != "$1" ]]; then
_gron_error
fi
gron_str=${gron_str:${#1}}
printf '%s=%s\n' "$gron_prefix" "$1"
}
gron
|
