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#!/usr/bin/env awk -f
BEGIN {
version = "0.1"
help[""] = "Commands:\n" \
" help [cmd] prints cmd help or this help text\n"
help["help"] = "help [cmd]\n" \
" Prints cmd help or general help text.\n" \
" Example: help help\n"
lnum = cnum = 0
if (str) {
lnum = 1
line = ARGV[1]
if (err = parse(v, "", line)) print "parse err: " err
for (k in v) print k " " v[k]
print "---"
print format(v, "", 1)
exit ERROR != 0
} else file = ARGV[1]
delete ARGV[1]
if (file) parse(v)
if (!notty) printf "%s\njp> ", "jp version " version ". Type \"help\" for help."
}
{
ERROR = ""
if ($1 == "help") {
printf "%s", help[$2]
} else if ($1 == "format") {
if ($2 == "\"\"") $2 = ""
print format(v, key(v, $2), !raw)
} else if ($1 == "key") {
print key(v, $2)
} else if ($1 == "filter") {
filter(v, "", $2)
} else if ($1 == "dump") {
if ($2 ~ /^\|/) {
cmd = substr($0, 1+index($0, "|"))
for (k in v) print k " " v[k] | cmd
close(cmd)
} else for (k in v) print k " " v[k]
} else if ($1 == "parse_string") {
delete v
sub(/^[[:space:]]+/, "")
$0 = substr($0, length($1)+2)
parse("", v, "", $0)
} else if ($1 == "parse") {
delete v
parse($2, v)
} else if (NF) {
error("invalid command: " $1)
}
if (ERROR) print ERROR > "/dev/stderr"
if (!notty) printf "%sjp> ", s
}
END { exit ERROR != "" }
function error(s, n) { ERROR = s; print "#error: " s >"/dev/stderr"; return n }
function debug(s) { print s > "/dev/stderr" }
function scan( c) {
while (c = substr(line, 1, 1)) {
if (c == "\n") { lnum++; cnum = 0 }
else if (c ~ /[ \t]/) cnum++
else break
line = substr(line, 2)
}
if (file) {
while (line == "") {
if ((getline line < file) <= 0) return
lnum++; cnum = 0
if (match(line, /^[ \t]+/)) {
cnum += RLENGTH
line = substr(line, RLENGTH+1)
}
}
}
if (match(line, /^(null|true|false|[][}{,:])/)) {
tok = substr(line, 1, 1)
} else if (match(line, /^[.0-9Ee+-]+/)) {
tok = "d" substr(line, 1, RLENGTH)
} else if (match(line, /^"(\\.|[^\\"])*"/)) {
tok = "s" substr(line, 2, RLENGTH-2)
} else {
tok = "b" substr(line, 1, 1)
}
cnum += RLENGTH
line = substr(line, RLENGTH+1)
}
# parse gets the next object from source and return an error if any.
function parse(values, key, id, ids, i, k, err) {
scan()
if (tok == "[") {
for (i = 0; tok != "]"; i++) {
if (i > 0 && tok != ",") return error("not a ',': ", tok)
if (err = parse(values, key SUBSEP i)) {
if (tok == "]" && i == 0) continue
return err
}
scan()
}
values[key] = "a" i
} else if (tok == "{") {
for (i = 0; tok != "}"; i++) {
if (i > 0 && tok != ",") return "i: " i ", not a ','"
scan()
if (i == 0 && tok == "}") break
if (tok !~ /^s/) return num ":" cnum ": not a string: " tok
k = substr(tok, 2)
ids = ids (i ? SUBSEP : "") substr(tok, 2)
scan()
if (tok != ":") return file ":" lnum ":" cnum -length(tok) ": not a ':'"
if (err = parse(values, key SUBSEP i)) return err
scan()
}
values[key] = "o" ids
} else if (tok ~ /^[ntfsd]/) {
values[key] = tok
} else return "unexpected tok: " tok
}
function format(values, key, indent, id, c, i, s, v, pre, post, sp) {
if (! (key in values)) return
if (indent) {
pre = space(indent * 2)
post = "\n"
sp = " "
}
if (id) id = "\"" id "\":" sp
v = values[key]
c = substr(v, 1, 1)
if (c == "n") return id "null"
if (c == "t") return id "true"
if (c == "f") return id "false"
if (c == "d") return id substr(v, 2)
if (c == "s") return id "\"" substr(v, 2) "\""
if (c == "a") {
s = "[" post
for (i = 0; ((key, i) in values); i++) {
if (i) s = s "," post
s = s pre format(values, key SUBSEP i, indent ? indent+1 : 0)
}
if (substr(s, length(s)-2, 1) == "[") return id substr(s, 1, length(s)-1) "]"
return id s post substr(pre, 3) "]"
}
if (c == "o") {
s = "{" post
v = substr(v, 2)
for (i = 0; ((key, i) in values); i++) {
if (i) s = s "," post
v = tail(v, SUBSEP)
s = s pre "\"" HEAD "\":" sp format(values, key SUBSEP i, indent ? indent+1 : 0)
}
if (substr(s, length(s)-2, 1) == "{") return id substr(s, 1, length(s)-1) "}"
return id s post substr(pre, 3) "}"
}
}
function space(n, i, s) {
for (i = 0; i < n; i++) s = s " "
return s
}
function tail(str, sep, i) {
if (i = index(str, sep)) {
HEAD = substr(str, 1, i-1)
return substr(str, i+1)
} else HEAD = str
}
function lindex(list, item, i, k) {
for (i = 0; list; i++) {
list = tail(list, SUBSEP)
if (HEAD == item) return i
}
return -1
}
# TODO: remove recursivity
# TODO: handle spaces
function key(values, pattern, k1, result, i, k, s, w) {
if (! (k1 in values)) return
gsub(/[.]/, SUBSEP, pattern)
pattern = tail(pattern, SUBSEP)
k = HEAD
if (k ~ /^[0-9]+$/) {
result = result SUBSEP k
} else {
s = substr(values[k1], 2)
if ((i = lindex(s, k)) >= 0) result = result SUBSEP i
}
if (pattern) return key(values, pattern, k1 SUBSEP i, result)
return result
}
function filter(values, key, sk, i, k, n, v) {
v = values[key]
if (v ~ /^o/) {
v = substr(v, 2)
for (i = 0; ((key, i) in values); i++) {
v = tail(v, SUBSEP)
k = HEAD
sk = sk ? sk "." k : k
print sk
filter(values, key SUBSEP i, sk)
} while (v)
return
}
if (v ~ /^a/) {
for (i = 0; ((key, i) in values); i++) {
sk = sk ? sk "." i : i
print sk
filter(values, key SUBSEP i, sk)
}
}
}
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