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Add capture; document regular expression filters

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Fix #493.
This commit is contained in:
pkoppstein
2014-07-19 01:08:38 -04:00
committed by Nicolas Williams
parent e1b20b48f0
commit 53993a9942
4 changed files with 138 additions and 77 deletions
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18
builtin.c
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@@ -970,11 +970,23 @@ static const char* const jq_builtins[] = {
"def flatten: reduce .[] as $i ([]; if $i | type == \"array\" then . + ($i | flatten) else . + [$i] end);",
"def flatten(x): reduce .[] as $i ([]; if $i | type == \"array\" and x > 0 then . + ($i | flatten(x-1)) else . + [$i] end);",
"def range(x): range(0;x);",
// regular expressions:
"def match(re; mode): _match_impl(re; mode; false)|.[];",
"def match(val): if val | type == \"string\" then match(val; null) elif val | type == \"array\" and (val | length) > 1 then match(val[0]; val[1]) elif val | type == \"array\" and (val | length > 0) then match(val[0]; null) else error((val | type) + \" not a string or array\") end;",
"def match(val): (val|type) as $vt | if $vt == \"string\" then match(val; null)"
" elif $vt == \"array\" and (val | length) > 1 then match(val[0]; val[1])"
" elif $vt == \"array\" and (val | length) > 0 then match(val[0]; null)"
" else error( $vt + \" not a string or array\") end;",
"def test(re; mode): _match_impl(re; mode; true);",
"def test(val): if val |type == \"string\" then test(val; null) elif val | type == \"array\" and (val | length) > 1 then test(val[0]; val[1]) elif val | type == \"array\" and (val | length > 0) then test(val[0]; null) else error((val | type) + \" not a string or array\") end;",
// "def test(re): _match(re; null; 1);",
"def test(val): (val|type) as $vt | if $vt == \"string\" then test(val; null)"
" elif $vt == \"array\" and (val | length) > 1 then test(val[0]; val[1])"
" elif $vt == \"array\" and (val | length) > 0 then test(val[0]; null)"
" else error( $vt + \" not a string or array\") end;",
// Ex.: "a1" | capture( "(?<x>[a-z*])" ).x => "a"
"def capture(re; mods): match(re; mods) | reduce ( .captures | .[] | select(.name != null) | { (.name) : .string } ) as $pair ({}; . + $pair);",
"def capture(val): (val|type) as $vt | if $vt == \"string\" then capture(val; null)"
" elif $vt == \"array\" and (val | length) > 1 then capture(val[0]; val[1])"
" elif $vt == \"array\" and (val | length) > 0 then capture(val[0]; null)"
" else error( $vt + \" not a string or array\") end;",
// range/3, with a `by` expression argument
"def range(init; upto; by): "
" def _range: "