Jonathan Word
ca12bd9b5d
Preserve key sorting order when executing in walk, if sorted keys is desired `--sort-keys` should be used to explicitly obtain sorted keys.
309 lines
12 KiB
Plaintext
309 lines
12 KiB
Plaintext
def halt_error: halt_error(5);
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def error: error(.);
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def map(f): [.[] | f];
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def select(f): if f then . else empty end;
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def sort_by(f): _sort_by_impl(map([f]));
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def group_by(f): _group_by_impl(map([f]));
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def unique: group_by(.) | map(.[0]);
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def unique_by(f): group_by(f) | map(.[0]);
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def max_by(f): _max_by_impl(map([f]));
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def min_by(f): _min_by_impl(map([f]));
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def add: reduce .[] as $x (null; . + $x);
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def del(f): delpaths([path(f)]);
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def _assign(paths; value): value as $v | reduce path(paths) as $p (.; setpath($p; $v));
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def _modify(paths; update): reduce path(paths) as $p (.; label $out | (setpath($p; getpath($p) | update) | ., break $out), delpaths([$p]));
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def map_values(f): .[] |= f;
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# recurse
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def recurse(f): def r: ., (f | r); r;
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def recurse(f; cond): def r: ., (f | select(cond) | r); r;
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def recurse: recurse(.[]?);
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def recurse_down: recurse;
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def to_entries: [keys_unsorted[] as $k | {key: $k, value: .[$k]}];
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def from_entries: map({(.key // .Key // .name // .Name): (if has("value") then .value else .Value end)}) | add | .//={};
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def with_entries(f): to_entries | map(f) | from_entries;
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def reverse: [.[length - 1 - range(0;length)]];
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def indices($i): if type == "array" and ($i|type) == "array" then .[$i]
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elif type == "array" then .[[$i]]
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elif type == "string" and ($i|type) == "string" then _strindices($i)
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else .[$i] end;
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def index($i): indices($i) | .[0]; # TODO: optimize
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def rindex($i): indices($i) | .[-1:][0]; # TODO: optimize
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def paths: path(recurse(if (type|. == "array" or . == "object") then .[] else empty end))|select(length > 0);
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def paths(node_filter): . as $dot|paths|select(. as $p|$dot|getpath($p)|node_filter);
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def any(generator; condition):
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[label $out | foreach generator as $i
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(false;
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if . then break $out elif $i | condition then true else . end;
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if . then . else empty end)] | length == 1;
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def any(condition): any(.[]; condition);
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def any: any(.);
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def all(generator; condition):
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[label $out | foreach generator as $i
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(true;
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if .|not then break $out elif $i | condition then . else false end;
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if .|not then . else empty end)] | length == 0;
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def all(condition): all(.[]; condition);
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def all: all(.);
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def isfinite: type == "number" and (isinfinite | not);
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def arrays: select(type == "array");
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def objects: select(type == "object");
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def iterables: arrays, objects;
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def booleans: select(type == "boolean");
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def numbers: select(type == "number");
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def normals: select(isnormal);
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def finites: select(isfinite);
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def strings: select(type == "string");
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def nulls: select(type == "null");
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def values: select(. != null);
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def scalars: select(. == null or . == true or . == false or type == "number" or type == "string");
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def scalars_or_empty: select(. == null or . == true or . == false or type == "number" or type == "string" or ((type=="array" or type=="object") and length==0));
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def leaf_paths: paths(scalars);
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def join($x): reduce .[] as $i (null;
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(if .==null then "" else .+$x end) +
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($i | if type=="boolean" or type=="number" then tostring else .//"" end)
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) // "";
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def _flatten($x): reduce .[] as $i ([]; if $i | type == "array" and $x != 0 then . + ($i | _flatten($x-1)) else . + [$i] end);
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def flatten($x): if $x < 0 then error("flatten depth must not be negative") else _flatten($x) end;
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def flatten: _flatten(-1);
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def range($x): range(0;$x);
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def fromdateiso8601: strptime("%Y-%m-%dT%H:%M:%SZ")|mktime;
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def todateiso8601: strftime("%Y-%m-%dT%H:%M:%SZ");
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def fromdate: fromdateiso8601;
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def todate: todateiso8601;
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def match(re; mode): _match_impl(re; mode; false)|.[];
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def match($val): ($val|type) as $vt | if $vt == "string" then match($val; null)
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elif $vt == "array" and ($val | length) > 1 then match($val[0]; $val[1])
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elif $vt == "array" and ($val | length) > 0 then match($val[0]; null)
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else error( $vt + " not a string or array") end;
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def test(re; mode): _match_impl(re; mode; true);
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def test($val): ($val|type) as $vt | if $vt == "string" then test($val; null)
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elif $vt == "array" and ($val | length) > 1 then test($val[0]; $val[1])
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elif $vt == "array" and ($val | length) > 0 then test($val[0]; null)
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else error( $vt + " not a string or array") end;
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def capture(re; mods): match(re; mods) | reduce ( .captures | .[] | select(.name != null) | { (.name) : .string } ) as $pair ({}; . + $pair);
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def capture($val): ($val|type) as $vt | if $vt == "string" then capture($val; null)
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elif $vt == "array" and ($val | length) > 1 then capture($val[0]; $val[1])
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elif $vt == "array" and ($val | length) > 0 then capture($val[0]; null)
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else error( $vt + " not a string or array") end;
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def scan(re):
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match(re; "g")
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| if (.captures|length > 0)
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then [ .captures | .[] | .string ]
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else .string
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end ;
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#
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# If input is an array, then emit a stream of successive subarrays of length n (or less),
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# and similarly for strings.
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def _nwise(a; $n): if a|length <= $n then a else a[0:$n] , _nwise(a[$n:]; $n) end;
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def _nwise($n): _nwise(.; $n);
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#
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# splits/1 produces a stream; split/1 is retained for backward compatibility.
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def splits($re; flags): . as $s
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# # multiple occurrences of "g" are acceptable
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| [ match($re; "g" + flags) | (.offset, .offset + .length) ]
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| [0] + . +[$s|length]
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| _nwise(2)
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| $s[.[0]:.[1] ] ;
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def splits($re): splits($re; null);
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#
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# split emits an array for backward compatibility
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def split($re; flags): [ splits($re; flags) ];
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#
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# If s contains capture variables, then create a capture object and pipe it to s
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def sub($re; s):
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. as $in
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| [match($re)]
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| if length == 0 then $in
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else .[0]
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| . as $r
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# # create the "capture" object:
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| reduce ( $r | .captures | .[] | select(.name != null) | { (.name) : .string } ) as $pair
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({}; . + $pair)
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| $in[0:$r.offset] + s + $in[$r.offset+$r.length:]
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end ;
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#
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# If s contains capture variables, then create a capture object and pipe it to s
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def sub($re; s; flags):
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def subg: [explode[] | select(. != 103)] | implode;
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# "fla" should be flags with all occurrences of g removed; gs should be non-nil if flags has a g
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def sub1(fla; gs):
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def mysub:
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. as $in
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| [match($re; fla)]
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| if length == 0 then $in
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else .[0] as $edit
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| ($edit | .offset + .length) as $len
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# create the "capture" object:
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| reduce ( $edit | .captures | .[] | select(.name != null) | { (.name) : .string } ) as $pair
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({}; . + $pair)
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| $in[0:$edit.offset]
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+ s
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+ ($in[$len:] | if length > 0 and gs then mysub else . end)
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end ;
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mysub ;
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(flags | index("g")) as $gs
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| (flags | if $gs then subg else . end) as $fla
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| sub1($fla; $gs);
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#
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def sub($re; s): sub($re; s; "");
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# repeated substitution of re (which may contain named captures)
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def gsub($re; s; flags): sub($re; s; flags + "g");
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def gsub($re; s): sub($re; s; "g");
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########################################################################
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# range/3, with a `by` expression argument
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def range($init; $upto; $by):
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def _range:
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if ($by > 0 and . < $upto) or ($by < 0 and . > $upto) then ., ((.+$by)|_range) else . end;
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if $by == 0 then $init else $init|_range end | select(($by > 0 and . < $upto) or ($by < 0 and . > $upto));
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# generic iterator/generator
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def while(cond; update):
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def _while:
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if cond then ., (update | _while) else empty end;
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_while;
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def until(cond; next):
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def _until:
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if cond then . else (next|_until) end;
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_until;
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def limit($n; exp): if $n < 0 then exp else label $out | foreach exp as $item ([$n, null]; if .[0] < 1 then break $out else [.[0] -1, $item] end; .[1]) end;
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def isempty(g): 0 == ((label $go | g | (1, break $go)) // 0);
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def first(g): label $out | g | ., break $out;
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def last(g): reduce g as $item (null; $item);
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def nth($n; g): if $n < 0 then error("nth doesn't support negative indices") else last(limit($n + 1; g)) end;
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def first: .[0];
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def last: .[-1];
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def nth($n): .[$n];
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def combinations:
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if length == 0 then [] else
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.[0][] as $x
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| (.[1:] | combinations) as $y
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| [$x] + $y
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end;
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def combinations(n):
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. as $dot
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| [range(n) | $dot]
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| combinations;
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# transpose a possibly jagged matrix, quickly;
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# rows are padded with nulls so the result is always rectangular.
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def transpose:
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if . == [] then []
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else . as $in
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| (map(length) | max) as $max
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| length as $length
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| reduce range(0; $max) as $j
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([]; . + [reduce range(0;$length) as $i ([]; . + [ $in[$i][$j] ] )] )
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end;
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def in(xs): . as $x | xs | has($x);
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def inside(xs): . as $x | xs | contains($x);
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def input: _input;
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def repeat(exp):
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def _repeat:
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exp, _repeat;
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_repeat;
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def inputs: try repeat(_input) catch if .=="break" then empty else .|error end;
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# like ruby's downcase - only characters A to Z are affected
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def ascii_downcase:
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explode | map( if 65 <= . and . <= 90 then . + 32 else . end) | implode;
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# like ruby's upcase - only characters a to z are affected
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def ascii_upcase:
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explode | map( if 97 <= . and . <= 122 then . - 32 else . end) | implode;
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# Streaming utilities
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def truncate_stream(stream):
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. as $n | null | stream | . as $input | if (.[0]|length) > $n then setpath([0];$input[0][$n:]) else empty end;
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def fromstream(i):
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foreach i as $item (
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[null,false,null,false];
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if ($item[0]|length) == 0 then [null,false,.[2],.[3]]
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elif ($item|length) == 1 and ($item[0]|length) < 2 then [null,false,.[0],.[1]]
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else . end |
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. as $state |
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if ($item|length) > 1 and ($item[0]|length) > 0 then
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[.[0]|setpath(($item|.[0]); ($item|.[1])),
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true,
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$state[2],
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$state[3]]
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else .
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end;
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if ($item[0]|length) == 1 and ($item|length == 1) and .[3] then .[2] else empty end,
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if ($item[0]|length) == 0 then $item[1] else empty end
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);
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def tostream:
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{string:true,number:true,boolean:true,null:true} as $leaf_types |
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. as $dot |
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if $leaf_types[$dot|type] or length==0 then [[],$dot]
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else
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# We really need a _streaming_ form of `keys`.
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# We can use `range` for arrays, but not for objects.
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keys as $keys |
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$keys[-1] as $last|
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((# for each key
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$keys[] | . as $key |
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$dot[$key] | . as $dot |
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# recurse on each key/value
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tostream|.[0]|=[$key]+.),
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# then add the closing marker
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[[$last]])
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end;
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# Assuming the input array is sorted, bsearch/1 returns
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# the index of the target if the target is in the input array; and otherwise
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# (-1 - ix), where ix is the insertion point that would leave the array sorted.
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# If the input is not sorted, bsearch will terminate but with irrelevant results.
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def bsearch(target):
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if length == 0 then -1
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elif length == 1 then
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if target == .[0] then 0 elif target < .[0] then -1 else -2 end
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else . as $in
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# state variable: [start, end, answer]
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# where start and end are the upper and lower offsets to use.
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| [0, length-1, null]
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| until( .[0] > .[1] ;
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if .[2] != null then (.[1] = -1) # i.e. break
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else
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( ( (.[1] + .[0]) / 2 ) | floor ) as $mid
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| $in[$mid] as $monkey
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| if $monkey == target then (.[2] = $mid) # success
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elif .[0] == .[1] then (.[1] = -1) # failure
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elif $monkey < target then (.[0] = ($mid + 1))
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else (.[1] = ($mid - 1))
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end
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end )
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| if .[2] == null then # compute the insertion point
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if $in[ .[0] ] < target then (-2 -.[0])
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else (-1 -.[0])
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end
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else .[2]
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end
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end;
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# Apply f to composite entities recursively, and to atoms
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def walk(f):
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. as $in
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| if type == "object" then
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reduce keys_unsorted[] as $key
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( {}; . + { ($key): ($in[$key] | walk(f)) } ) | f
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elif type == "array" then map( walk(f) ) | f
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else f
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end;
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# SQL-ish operators here:
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def INDEX(stream; idx_expr):
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reduce stream as $row ({};
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.[$row|idx_expr|
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if type != "string" then tojson
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else .
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end] |= $row);
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def INDEX(idx_expr): INDEX(.[]; idx_expr);
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def JOIN($idx; idx_expr):
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[.[] | [., $idx[idx_expr]]];
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def JOIN($idx; stream; idx_expr):
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stream | [., $idx[idx_expr]];
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def JOIN($idx; stream; idx_expr; join_expr):
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stream | [., $idx[idx_expr]] | join_expr;
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def IN(s): reduce (first(select(. == s)) | true) as $v (false; if . or $v then true else false end);
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def IN(src; s): reduce (src|IN(s)) as $v (false; if . or $v then true else false end);
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