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json_writer: new routines to create JSON data

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Add "struct json_writer" and a series of jw_ routines to compose JSON
data into a string buffer.  The resulting string may then be printed by
commands wanting to support a JSON-like output format.

The json_writer is limited to correctly formatting structured data for
output.  It does not attempt to build an object model of the JSON data.

We say "JSON-like" because we do not enforce the Unicode (usually UTF-8)
requirement on string fields.  Internally, Git does not necessarily have
Unicode/UTF-8 data for most fields, so it is currently unclear the best
way to enforce that requirement.  For example, on Linux pathnames can
contain arbitrary 8-bit character data, so a command like "status" would
not know how to encode the reported pathnames.  We may want to revisit
this (or double encode such strings) in the future.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: René Scharfe <l.s.r@web.de>
Helped-by: Wink Saville <wink@saville.com>
Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler
2018-07-13 16:54:08 +00:00
committed by Junio C Hamano
parent b2453d3449
commit 75459410ed
8 changed files with 1471 additions and 0 deletions
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52
t/t0019/parse_json.perl Normal file
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#!/usr/bin/perl
use strict;
use warnings;
use JSON;
sub dump_array {
my ($label_in, $ary_ref) = @_;
my @ary = @$ary_ref;
for ( my $i = 0; $i <= $#{ $ary_ref }; $i++ )
{
my $label = "$label_in\[$i\]";
dump_item($label, $ary[$i]);
}
}
sub dump_hash {
my ($label_in, $obj_ref) = @_;
my %obj = %$obj_ref;
foreach my $k (sort keys %obj) {
my $label = (length($label_in) > 0) ? "$label_in.$k" : "$k";
my $value = $obj{$k};
dump_item($label, $value);
}
}
sub dump_item {
my ($label_in, $value) = @_;
if (ref($value) eq 'ARRAY') {
print "$label_in array\n";
dump_array($label_in, $value);
} elsif (ref($value) eq 'HASH') {
print "$label_in hash\n";
dump_hash($label_in, $value);
} elsif (defined $value) {
print "$label_in $value\n";
} else {
print "$label_in null\n";
}
}
my $row = 0;
while (<>) {
my $data = decode_json( $_ );
my $label = "row[$row]";
dump_hash($label, $data);
$row++;
}