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interp: Add grep_by/1 to recursively match using a filter

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Refactor other grep functions to use it
This commit is contained in:
Mattias Wadman 2022-01-24 18:21:43 +01:00
parent 4f490e5618
commit e792598c69
3 changed files with 39 additions and 41 deletions
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1
doc/usage.md
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@ -318,6 +318,7 @@ unary uses input and if more than one argument all as arguments ignoring the inp
- `vgrep/1`, `vgrep/2` recursively match value
- `bgrep/1`, `bgrep/2` recursively match buffer
- `fgrep/1`, `fgrep/2` recursively match field name
- `grep_by/1` recursively match using a filter. Ex: `grep_by(. > 180 and . < 200)`, `first(grep_by(format == "id3v2"))`.
- Buffers:
- `tobits/0` - Transform input into a bits buffer not preserving source range, will start at zero.
- `tobitsrange/0` - Transform input into a bits buffer preserving source range if possible.

61
pkg/interp/grep.jq
View File

@ -1,13 +1,7 @@
def _grep($v; filter_cond; string_cond; other_cond):
if $v | type == "string" then
( ..
| select(filter_cond and string_cond)
)
else
( ..
| select(filter_cond and other_cond)
)
end;
def grep_by(f):
( ..
| select(f)?
);
def _value_grep_string_cond($v; $flags):
if type == "string" then test($v; $flags)
@ -18,46 +12,31 @@ def _value_grep_other_cond($v; $flags):
. == $v;
def vgrep($v; $flags):
_grep(
$v;
_is_scalar;
_value_grep_string_cond($v; $flags);
_value_grep_other_cond($v; $flags)
);
if $v | type == "string" then
grep_by(_is_scalar and _value_grep_string_cond($v; $flags))
else
grep_by(_is_scalar and _value_grep_other_cond($v; $flags))
end;
def vgrep($v): vgrep($v; "");
def _buf_grep_any_cond($v; $flags):
(isempty(tobytesrange | match($v; $flags)) | not)? // false;
def bgrep($v; $flags):
_grep(
$v;
_is_scalar;
_buf_grep_any_cond($v; $flags);
_buf_grep_any_cond($v; $flags)
);
if $v | type == "string" then
grep_by(_is_scalar and _buf_grep_any_cond($v; $flags))
else
grep_by(_is_scalar and _buf_grep_any_cond($v; $flags))
end;
def bgrep($v): bgrep($v; "");
def grep($v; $flags):
_grep(
$v;
_is_scalar;
_buf_grep_any_cond($v; $flags) or _value_grep_string_cond($v; $flags);
_buf_grep_any_cond($v; $flags) or _value_grep_other_cond($v; $flags)
);
if $v | type == "string" then
grep_by(_is_scalar and _buf_grep_any_cond($v; $flags) or _value_grep_string_cond($v; $flags))
else
grep_by(_is_scalar and _buf_grep_any_cond($v; $flags) or _value_grep_other_cond($v; $flags))
end;
def grep($v): grep($v; "");
def _field_grep_string_cond($v; $flags):
(._name | test($v; $flags))? // false;
def fgrep($v; $flags):
_grep(
$v;
_is_decode_value;
_field_grep_string_cond($v; $flags);
empty
);
grep_by(_is_decode_value and (._name | test($v; $flags))? // false);
def fgrep($v): fgrep($v; "");

18
pkg/interp/testdata/grep.fqtest vendored
View File

@ -56,4 +56,22 @@ mp3> bgrep(44100, "ID", "^ID3$", "^ID.?$", "Info", "magic", "\u00ff", [0x49, 0x4
mp3> "64ff65ff66" | hex | bgrep("\u00ff"; "b")
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
0x0|64 ff 65 ff 66| |d.e.f| |.: raw bits 0x0-0x4.7 (5)
mp3> grep_by(. == 44100)
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
0x20| 40| @|.frames[0].header.sample_rate: 44100 (0)
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
0xe0| 50 | P |.frames[1].header.sample_rate: 44100 (0)
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
0x1b0| 52 | R |.frames[2].header.sample_rate: 44100 (0)
mp3> grep_by(format == "id3v2")
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|.headers[0]{}: (id3v2)
0x00|49 44 33 |ID3 | magic: "ID3" (valid)
0x00| 04 | . | version: 4
0x00| 00 | . | revision: 0
0x00| 00 | . | flags{}:
0x00| 00 00 00 23 | ...# | size: 35
0x00| 54 53 53 45 00 00| TSSE..| frames[0:1]:
0x10|00 0f 00 00 03 4c 61 76 66 35 38 2e 34 35 2e 31|.....Lavf58.45.1|
0x20|30 30 00 |00. |
0x20| 00 00 00 00 00 00 00 00 00 00 | .......... | padding: raw bits (all zero)
mp3> ^D