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parsrj.sh
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parsrj.sh
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#!/bin/sh
######################################################################
#
# PARSRJ.SH
# A JSON Parser Which Convert Into "JSONPath-value"
#
# === What is "JSONPath-value" Formatted Text? ===
# 1. Format
# <JSONPath_string#1> + <0x20> + <value_at_that_path#1>
# <JSONPath_string#2> + <0x20> + <value_at_that_path#2>
# <JSONPath_string#3> + <0x20> + <value_at_that_path#3>
# : : :
#
# === This Command will Do Like the Following Conversion ===
# 1. Input Text (JSON)
# {"hoge":111,
# "foo" :["2\n2",
# {"bar" :"3 3",
# "fizz":{"bazz":444}
# },
# "\u5555"
# ]
# }
# 2. Output Text This Command Converts Into
# $.hoge 111
# $.foo[0] 2\n2
# $.foo[1].bar 3 3
# $.foo[1].fizz.bazz 444
# $.foo[2] \u5555
#
# === Usage ===
# Usage : parsrj.sh [options] [JSON_file]
# Options : -t Quote string values explicitly
# : -e Escape the following characters in impolite JSON key fields
# (" ",<0x09>,".","[","]")
# : --xpath Output in XPath format rather JSONPath
# It is equivalent to specifying the following option:
# (-rt -kd/ -lp'[' -ls']' -fn1 -li)
# <<The following options arrange the JSONPath format>>
# -sk<s> Replace <0x20> chrs in key string with <s>
# -rt<s> Replace the root symbol "$" of JSONPath with <s>
# -kd<s> Replace the delimiter "." of JSONPath hierarchy with <s>
# -lp<s> Replace the prefix of array character "[" with <s>
# -ls<s> Replace the suffix of array character "]" with <s>
# -fn<n> Redefine the start number of arrays with <n>
# -li Insert another JSONPath line which has no value
# Environs: LINE_BUFFERED
# =yes ........ Line-buffered mode if possible
# =forcible ... Force line-buffered mode. Exit if unavailable.
#
#
# Written by Shell-Shoccar Japan (@shellshoccarjpn) on 2022-02-06
#
# This is a public-domain software (CC0). It means that all of the
# people can use this for any purposes with no restrictions at all.
# By the way, We are fed up with the side effects which are brought
# about by the major licenses.
#
######################################################################
######################################################################
# Initial configuration
######################################################################
# === Initialize shell environment ===================================
set -u
umask 0022
export LC_ALL=C
export PATH="$(command -p getconf PATH 2>/dev/null)${PATH+:}${PATH-}"
case $PATH in :*) PATH=${PATH#?};; esac
export POSIXLY_CORRECT=1 # to make GNU Coreutils conform to POSIX
export UNIX_STD=2003 # to make HP-UX conform to POSIX
IFS='
'
# === Usage printing function ========================================
print_usage_and_exit () {
cat <<USAGE 1>&2
Usage : ${0##*/} [options] [JSON_file]
Options : -t Quote string values explicitly
-e Escape the following characters in impolite JSON key fields
(" ",".","[","]")
--xpath Output in XPath format rather JSONPath
It is equivalent to specifying the following option:
(-rt -kd/ -lp'[' -ls']' -fn1 -li)
<<The following options arrange the JSONPath format>>
-sk<s> Replace <0x20> chrs in key string with <s>
-rt<s> Replace the root symbol "$" of JSONPath with <s>
-kd<s> Replace the delimiter "." of JSONPath hierarchy with <s>
-lp<s> Replace the prefix of array character "[" with <s>
-ls<s> Replace the suffix of array character "]" with <s>
-fn<n> Redefine the start number of arrays with <n>
-li Insert another JSONPath line which has no value
Environs: LINE_BUFFERED
=yes ........ Line-buffered mode if possible
=forcible ... Force line-buffered mode. Exit if unavailable.
Version : 2022-02-06 01:34:22 JST
(POSIX Bourne Shell/POSIX commands)
USAGE
exit 1
}
######################################################################
# Parse Arguments
######################################################################
# === Print the usage when "--help" is put ===========================
case "$# ${1:-}" in
'1 -h'|'1 --help'|'1 --version') print_usage_and_exit;;
esac
# === Get the options and the filepath ===============================
# --- initialize option parameters -----------------------------------
file=''
sk='_'
rt='$'
kd='.'
lp='['
ls=']'
fn=0
unoptli='#'
unopte='#'
optt=''
unoptt='#'
#
# --- get them -------------------------------------------------------
for arg in ${1+"$@"}; do
if [ "_${arg#-sk}" != "_$arg" ] && [ -z "$file" ] ; then
sk=${arg#-sk}
elif [ "_${arg#-rt}" != "_$arg" ] && [ -z "$file" ] ; then
rt=${arg#-rt}
elif [ "_${arg#-kd}" != "_$arg" ] && [ -z "$file" ] ; then
kd=${arg#-kd}
elif [ "_${arg#-lp}" != "_$arg" ] && [ -z "$file" ] ; then
lp=${arg#-lp}
elif [ "_${arg#-ls}" != "_$arg" ] && [ -z "$file" ] ; then
ls=${arg#-ls}
elif [ "_${arg#-fn}" != "_$arg" ] && [ -z "$file" ] &&
printf '%s\n' "$arg" | grep -Eq '^-fn[0-9]+$' ; then
fn=${arg#-fn}
fn=$((fn+0))
elif [ "_$arg" = '_-li' ] && [ -z "$file" ] ; then
unoptli=''
elif [ "_$arg" = '_--xpath' ] && [ -z "$file" ] ; then
unoptli=''; rt=''; kd='/'; lp='['; ls=']'; fn=1
elif [ "_$arg" = '_-t' ] && [ -z "$file" ] ; then
unoptt=''; optt='#'
elif [ "_$arg" = '_-e' ] && [ -z "$file" ] ; then
unopte=''
elif ([ -f "$arg" ] || [ -c "$arg" ]) && [ -z "$file" ]; then
file=$arg
elif [ "_$arg" = "_-" ] && [ -z "$file" ] ; then
file='-'
else
print_usage_and_exit
fi
done
# === Validate the arguments =========================================
if [ "_$file" = '_' ] ||
[ "_$file" = '_-' ] ||
[ "_$file" = '_/dev/stdin' ] ||
[ "_$file" = '_/dev/fd/0' ] ||
[ "_$file" = '_/proc/self/fd/0' ] ; then
file=''
elif [ -f "$file" ] ||
[ -c "$file" ] ||
[ -p "$file" ] ; then
[ -r "$file" ] || error_exit 1 'Cannot open the file: '"$file"
else
print_usage_and_exit
fi
case "$file" in ''|-|/*|./*|../*) :;; *) file="./$file";; esac
######################################################################
# Prepare for the Main Routine
######################################################################
# === Define some chrs. to escape some special chrs. temporarily =====
s=$(printf '\025\t\026\\\n_')
NAK=${s%?????}; s=${s#?} # Escape character for the backslash
HT=${s%????} ; s=${s#?} # Means a TAB
DQ=${s%???} ; s=${s#?} # Use to escape double quotation temporarily
LFs=${s%?} # Use as a "\n" in s-command of sed
# === Export the variables to use in the following last AWK script ===
export sk
export rt
export kd
export lp
export ls
# === Switch to the line-buffered mode if required ===================
awkfl=''
case "${LINE_BUFFERED:-}" in
[Ff][Oo][Rr][Cc][EeIi]*|2) lbm=2;;
[Tt][Rr][Uu][Ee]|[Yy][Ee][Ss]|[Yy]|1) lbm=1;;
*) lbm=0;;
esac
case $lbm in [!0]*)
s=$(awk -W interactive 'BEGIN{}' 2>&1)
case "$?$s" in
'0') alias awk='awk -W interactive';;
*) awkfl='system("");' ;;
esac
s="$(type stdbuf >/dev/null 2>&1 && echo "s")"
s="$(type ptw >/dev/null 2>&1 && echo "p")$s"
if sed -u p </dev/null >/dev/null 2>&1; then
alias sed='sed -u'
else
case "$s $lbm" in
*s*) alias sed='stdbuf -o L sed' ;;
*p*) alias sed='ptw sed' ;;
*' 2') error_exit 1 'Line-buffered mode is not supported';;
esac
fi
if echo 1 | grep -q --line-buffered ^ 2>/dev/null; then
alias grep='grep --line-buffered'
else
case "$s $lbm" in
*s*) alias grep='stdbuf -o L grep' ;;
*p*) alias grep='ptw grep' ;;
*' 2') error_exit 1 'Line-buffered mode is not supported';;
esac
fi
case "$s $lbm" in
*s*) alias cat='stdbuf -o L cat' ;;
*p*) alias cat='ptw cat' ;;
*' 2') error_exit 1 'Line-buffered mode is not supported';;
esac
;; esac
######################################################################
# Main Routine (Convert and Generate)
######################################################################
# === Open the JSON data source ======================================== #
cat ${file:+"$file"} |
# #
# === Escape DQs and put each string between DQs into a sigle line ===== #
sed 's/\\\\/'"$NAK"'/g' |
sed 's/\\"/'"$DQ"'/g' |
awk ' #
BEGIN { #
OFS=""; ORS=""; #
f=0; #
while (getline line) { #
while (line!="") { #
p=index(line,"\""); #
if (p==0) {print line; break;} #
if (f==0) { #
print substr(line,1,p-1),"\n\"";'"$awkfl"' #
line=substr(line,p+1); #
f=1; #
} else { #
print substr(line,1,p ), "\n";'"$awkfl"' #
line=substr(line,p+1); #
f=0; #
} #
} #
} #
}' |
sed 's/'"$NAK"'/\\\\/g' |
# #
# === Insert "\n" into the head and the tail of the lines which are ==== #
# not as just a value string #
sed "/^[^\"]/s/\([][{}:,]\)/$LFs\1$LFs/g" |
# #
# === Cut the unnecessary spaces and tabs and "\n"s ==================== #
sed 's/^[ '"$HT"']\{1,\}//' |
sed 's/[ '"$HT"']\{1,\}$//' |
grep -v '^[ '"$HT"']*$' |
# #
# === Generate the JSONPath-value with referring the head of the ======= #
# strings and thier order #
awk ' #
BEGIN { #
# Load shell values which have option parameters #
alt_spc_in_key=ENVIRON["sk"]; #
root_symbol =ENVIRON["rt"]; #
key_delimit =ENVIRON["kd"]; #
list_prefix =ENVIRON["lp"]; #
list_suffix =ENVIRON["ls"]; #
# Initialize the data category stack #
datacat_stack[0]=""; #
delete datacat_stack[0] #
# Initialize the key name stack #
keyname_stack[0]=""; #
delete keyname_stack[0] #
# Set 0 as stack depth #
stack_depth=0; #
# Initialize the error assertion variable #
_assert_exit=0; #
# Define the character for escaping double-quotation (DQ) character #
DQ="'$DQ'"; #
# Set null as field,record sparator for the print function #
OFS=""; #
ORS=""; #
# #
# MAIN LOOP #
while (getline line) { #
# In "{"-line case #
if (line=="{") { #
if ((stack_depth==0) || #
(datacat_stack[stack_depth]=="l0") || #
(datacat_stack[stack_depth]=="l1") || #
(datacat_stack[stack_depth]=="h3") ) { #
stack_depth++; #
datacat_stack[stack_depth]="h0"; #
continue; #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In "}"-line case #
} else if (line=="}") { #
if (stack_depth>0) { #
s=datacat_stack[stack_depth]; #
if (s=="h0" || s=="h4") { #
if (s=="h0") {print_path();} #
delete datacat_stack[stack_depth]; #
delete keyname_stack[stack_depth]; #
stack_depth--; #
if (stack_depth>0) { #
if ((datacat_stack[stack_depth]=="l0") || #
(datacat_stack[stack_depth]=="l1") ) { #
datacat_stack[stack_depth]="l2" #
} else if (datacat_stack[stack_depth]=="h3") { #
datacat_stack[stack_depth]="h4" #
} #
} #
continue; #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In "["-line case #
} else if (line=="[") { #
if ((stack_depth==0) || #
(datacat_stack[stack_depth]=="l0") || #
(datacat_stack[stack_depth]=="l1") || #
(datacat_stack[stack_depth]=="h3") ) { #
stack_depth++; #
datacat_stack[stack_depth]="l0"; #
keyname_stack[stack_depth]='"$fn"'; #
continue; #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In "]"-line case #
} else if (line=="]") { #
if (stack_depth>0) { #
s=datacat_stack[stack_depth]; #
if (s=="l0" || s=="l2") { #
if (s=="l0") {print_path();} #
'"$unoptli"'if (s=="l2") {print_path();} #
delete datacat_stack[stack_depth]; #
delete keyname_stack[stack_depth]; #
stack_depth--; #
if (stack_depth>0) { #
if ((datacat_stack[stack_depth]=="l0") || #
(datacat_stack[stack_depth]=="l1") ) { #
datacat_stack[stack_depth]="l2" #
} else if (datacat_stack[stack_depth]=="h3") { #
datacat_stack[stack_depth]="h4" #
} #
} #
continue; #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In ":"-line case #
} else if (line==":") { #
if ((stack_depth>0) && #
(datacat_stack[stack_depth]=="h2") ) { #
datacat_stack[stack_depth]="h3"; #
continue; #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In ","-line case #
} else if (line==",") { #
# 1)Confirm the datacat stack is not empty #
if (stack_depth==0) { #
_assert_exit=1; #
exit _assert_exit; #
} #
'"$unoptli"'# 1.5)Action in case which li option is enabled #
'"$unoptli"'if (substr(datacat_stack[stack_depth],1,1)=="l") { #
'"$unoptli"' print_path(); #
'"$unoptli"'} #
# 2)Do someting according to the top of datacat stack #
# 2a)When "l2" (list-step2 : just after getting a value in list) #
if (datacat_stack[stack_depth]=="l2") { #
datacat_stack[stack_depth]="l1"; #
keyname_stack[stack_depth]++; #
continue; #
# 2b)When "lh" (hash-step4 : just after getting a value in hash) #
} else if (datacat_stack[stack_depth]=="h4") { #
datacat_stack[stack_depth]="h1"; #
continue; #
# 2c)Other cases (error) #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
# In another line case #
} else { #
# 1)Confirm the datacat stack is not empty #
if (stack_depth==0) { #
_assert_exit=1; #
exit _assert_exit; #
} #
# 2)Remove the head/tail DQs quoting a string when they exists #
# 3)Unescape the escaped DQs #
if (match(line,/^".*"$/)) { #
gsub(DQ,"\\\"",line); #
key=substr(line,2,length(line)-2); #
'"$optt"'value=key; #
'"$unoptt"'value=line; #
} else { #
gsub(DQ,"\\\"",line); #
key=line; #
value=line; #
} #
'"$unopte"'gsub(/ / ,"\\u0020",key); #
'"$unopte"'gsub(/\t/,"\\u0009",key); #
'"$unopte"'gsub(/\./,"\\u002e",key); #
'"$unopte"'gsub(/\[/,"\\u005b",key); #
'"$unopte"'gsub(/\]/,"\\u005d",key); #
# 4)Do someting according to the top of datacat stack #
# 4a)When "l0" (list-step0 : waiting for the 1st value) #
s=datacat_stack[stack_depth]; #
if ((s=="l0") || (s=="l1")) { #
print_path_and_value(value); #
datacat_stack[stack_depth]="l2"; #
# 4b)When "h0,1" (hash-step0,1 : waiting for the 1st or next key) #
} else if (s=="h0" || (s=="h1")) { #
gsub(/ /,alt_spc_in_key,key); #
keyname_stack[stack_depth]=key; #
datacat_stack[stack_depth]="h2"; #
# 4c)When "h3" (hash-step3 : waiting for a value of hash) #
} else if (s=="h3") { #
print_path_and_value(value); #
datacat_stack[stack_depth]="h4"; #
# 4d)Other cases (error) #
} else { #
_assert_exit=1; #
exit _assert_exit; #
} #
} #
} #
} #
END { #
# FINAL ROUTINE #
if (_assert_exit) { #
print "Invalid JSON format\n" | "cat 1>&2"; #
line1="keyname-stack:"; #
line2="datacat-stack:"; #
for (i=1;i<=stack_depth;i++) { #
line1=line1 sprintf("{%s}",keyname_stack[i]); #
line2=line2 sprintf("{%s}",datacat_stack[i]); #
} #
print line1, "\n", line2, "\n" | "cat 1>&2"; #
} #
exit _assert_exit; #
} #
# The Functions printing JSONPath-value #
function print_path( i) { #
print root_symbol; #
for (i=1;i<=stack_depth;i++) { #
if (substr(datacat_stack[i],1,1)=="l") { #
print list_prefix, keyname_stack[i], list_suffix; #
} else { #
print key_delimit, keyname_stack[i]; #
} #
} #
print "\n";'"$awkfl"' #
} #
function print_path_and_value(str ,i) { #
print root_symbol; #
for (i=1;i<=stack_depth;i++) { #
if (substr(datacat_stack[i],1,1)=="l") { #
print list_prefix, keyname_stack[i], list_suffix; #
} else { #
print key_delimit, keyname_stack[i]; #
} #
} #
print " ", str, "\n";'"$awkfl"' #
} #
'