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feat(jq): luhn attempt

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Signed-off-by: Christina Sørensen <christina@cafkafk.com>
This commit is contained in:
Christina Sørensen 2024-12-15 08:25:47 +01:00
parent 538c171922
commit c2076f3645
Signed by: cafkafk
GPG key ID: 26C542FD97F965CE
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19
jq/luhn/.exercism/config.json Normal file
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{
"authors": [
"MatthijsBlom"
],
"files": {
"solution": [
"luhn.jq"
],
"test": [
"test-luhn.bats"
],
"example": [
".meta/example.jq"
]
},
"blurb": "Given a number determine whether or not it is valid per the Luhn formula.",
"source": "The Luhn Algorithm on Wikipedia",
"source_url": "https://en.wikipedia.org/wiki/Luhn_algorithm"
}

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jq/luhn/.exercism/metadata.json Normal file
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{"track":"jq","exercise":"luhn","id":"b7576a00f34a4e039d5466cee7311774","url":"https://exercism.org/tracks/jq/exercises/luhn","handle":"cafkafk","is_requester":true,"auto_approve":false}

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jq/luhn/HELP.md Normal file
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# Help
## Running the tests
Each exercise contains a test file.
Run the tests using the `bats` program.
```bash
bats test-hello-world.bats
```
`bats` will need to be installed.
See the [Testing on the Bash track][bash] page for instructions to install `bats` for your system.
### bats is implemented in bash
The bats file is a bash script, with some special functions recognized by the `bats` command.
You'll see some tests that look like
```sh
jq -f some-exercise.jq <<< "{some,json,here}"
```
That `<<<` syntax is a bash [Here String][here-string].
It sends the string on the right-hand side into the standard input of the program on the left-hand side.
It is ([approximately][so]) the same as
```sh
echo "{some,json,here}" | jq -f some-exercise.jq
```
## Help for assert functions
The tests use functions from the [bats-assert][bats-assert] library.
Help for the various `assert*` functions can be found there.
## Skipped tests
Solving an exercise means making all its tests pass.
By default, only one test (the first one) is executed when you run the tests.
This is intentional, as it allows you to focus on just making that one test pass.
Once it passes, you can enable the next test by commenting out or removing the
[[ $BATS_RUN_SKIPPED == true ]] || skip
annotations prepending other tests.
## Overriding skips
To run all tests, including the ones with `skip` annotations, you can run:
```bash
BATS_RUN_SKIPPED=true bats test-some-exercise.bats
```
It can be convenient to use a wrapper function to save on typing: in `bash` you can do:
```bash
bats() {
BATS_RUN_SKIPPED=true command bats *.bats
}
```
Then run tests with just:
```bash
bats
```
## Debugging in `jq`
`jq` comes with a handy [`debug`][debug] filter.
Use it while you are developing your exercise solutions to inspect the data that is currently in the jq pipline.
See the [debugging doc][debugging] for more details.
[bash]: https://exercism.org/docs/tracks/bash/tests
[bats-assert]: https://github.com/bats-core/bats-assert
[here-string]: https://www.gnu.org/software/bash/manual/bash.html#Here-Strings
[so]: https://unix.stackexchange.com/a/80372/4667
[debug]: https://jqlang.github.io/jq/manual/v1.7/#debug
[debugging]: https://exercism.org/docs/tracks/jq/debugging
## Submitting your solution
You can submit your solution using the `exercism submit luhn.jq` command.
This command will upload your solution to the Exercism website and print the solution page's URL.
It's possible to submit an incomplete solution which allows you to:
- See how others have completed the exercise
- Request help from a mentor
## Need to get help?
If you'd like help solving the exercise, check the following pages:
- The [jq track's documentation](https://exercism.org/docs/tracks/jq)
- The [jq track's programming category on the forum](https://forum.exercism.org/c/programming/jq)
- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
## Need more help?
- Go to the [Exercism Community forum](https://forum.exercism.org) to get support and ask questions (or just chat!)
- Use the [Exercism Support](https://forum.exercism.org/c/support/8) category if you face any issues with working in the web editor, or downloading or submitting your exercises locally.
- Use the [Programming:jq](https://forum.exercism.org/c/programming/jq/133) category for jq-specific topics.
- Join the community on [Exercism's Discord server](https://exercism.org/r/discord).
- [StackOverflow](https://stackoverflow.com/questions/tagged/jq) can be used to search for your problem and see if it has been answered already.
You can also ask and answer questions.
- [Github issue tracker](https://github.com/exercism/jq/issues) is where we track our development and maintainance of `jq` exercises in exercism.
If none of the above links help you, feel free to post an issue here.

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jq/luhn/README.md Normal file
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# Luhn
Welcome to Luhn on Exercism's jq Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Instructions
Given a number determine whether or not it is valid per the Luhn formula.
The [Luhn algorithm][luhn] is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers and Canadian Social Insurance Numbers.
The task is to check if a given string is valid.
## Validating a Number
Strings of length 1 or less are not valid.
Spaces are allowed in the input, but they should be stripped before checking.
All other non-digit characters are disallowed.
### Example 1: valid credit card number
```text
4539 3195 0343 6467
```
The first step of the Luhn algorithm is to double every second digit, starting from the right.
We will be doubling
```text
4539 3195 0343 6467
↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ (double these)
```
If doubling the number results in a number greater than 9 then subtract 9 from the product.
The results of our doubling:
```text
8569 6195 0383 3437
```
Then sum all of the digits:
```text
8+5+6+9+6+1+9+5+0+3+8+3+3+4+3+7 = 80
```
If the sum is evenly divisible by 10, then the number is valid.
This number is valid!
### Example 2: invalid credit card number
```text
8273 1232 7352 0569
```
Double the second digits, starting from the right
```text
7253 2262 5312 0539
```
Sum the digits
```text
7+2+5+3+2+2+6+2+5+3+1+2+0+5+3+9 = 57
```
57 is not evenly divisible by 10, so this number is not valid.
[luhn]: https://en.wikipedia.org/wiki/Luhn_algorithm
## Source
### Created by
- @MatthijsBlom
### Based on
The Luhn Algorithm on Wikipedia - https://en.wikipedia.org/wiki/Luhn_algorithm

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jq/luhn/bats-extra.bash Normal file
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# This is the source code for bats-support and bats-assert, concatenated
# * https://github.com/bats-core/bats-support
# * https://github.com/bats-core/bats-assert
#
# Comments have been removed to save space. See the git repos for full source code.
############################################################
#
# bats-support - Supporting library for Bats test helpers
#
# Written in 2016 by Zoltan Tombol <zoltan dot tombol at gmail dot com>
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty.
#
# You should have received a copy of the CC0 Public Domain Dedication
# along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
#
fail() {
(( $# == 0 )) && batslib_err || batslib_err "$@"
return 1
}
batslib_is_caller() {
local -i is_mode_direct=1
# Handle options.
while (( $# > 0 )); do
case "$1" in
-i|--indirect) is_mode_direct=0; shift ;;
--) shift; break ;;
*) break ;;
esac
done
# Arguments.
local -r func="$1"
# Check call stack.
if (( is_mode_direct )); then
[[ $func == "${FUNCNAME[2]}" ]] && return 0
else
local -i depth
for (( depth=2; depth<${#FUNCNAME[@]}; ++depth )); do
[[ $func == "${FUNCNAME[$depth]}" ]] && return 0
done
fi
return 1
}
batslib_err() {
{ if (( $# > 0 )); then
echo "$@"
else
cat -
fi
} >&2
}
batslib_count_lines() {
local -i n_lines=0
local line
while IFS='' read -r line || [[ -n $line ]]; do
(( ++n_lines ))
done < <(printf '%s' "$1")
echo "$n_lines"
}
batslib_is_single_line() {
for string in "$@"; do
(( $(batslib_count_lines "$string") > 1 )) && return 1
done
return 0
}
batslib_get_max_single_line_key_width() {
local -i max_len=-1
while (( $# != 0 )); do
local -i key_len="${#1}"
batslib_is_single_line "$2" && (( key_len > max_len )) && max_len="$key_len"
shift 2
done
echo "$max_len"
}
batslib_print_kv_single() {
local -ir col_width="$1"; shift
while (( $# != 0 )); do
printf '%-*s : %s\n' "$col_width" "$1" "$2"
shift 2
done
}
batslib_print_kv_multi() {
while (( $# != 0 )); do
printf '%s (%d lines):\n' "$1" "$( batslib_count_lines "$2" )"
printf '%s\n' "$2"
shift 2
done
}
batslib_print_kv_single_or_multi() {
local -ir width="$1"; shift
local -a pairs=( "$@" )
local -a values=()
local -i i
for (( i=1; i < ${#pairs[@]}; i+=2 )); do
values+=( "${pairs[$i]}" )
done
if batslib_is_single_line "${values[@]}"; then
batslib_print_kv_single "$width" "${pairs[@]}"
else
local -i i
for (( i=1; i < ${#pairs[@]}; i+=2 )); do
pairs[$i]="$( batslib_prefix < <(printf '%s' "${pairs[$i]}") )"
done
batslib_print_kv_multi "${pairs[@]}"
fi
}
batslib_prefix() {
local -r prefix="${1:- }"
local line
while IFS='' read -r line || [[ -n $line ]]; do
printf '%s%s\n' "$prefix" "$line"
done
}
batslib_mark() {
local -r symbol="$1"; shift
# Sort line numbers.
set -- $( sort -nu <<< "$( printf '%d\n' "$@" )" )
local line
local -i idx=0
while IFS='' read -r line || [[ -n $line ]]; do
if (( ${1:--1} == idx )); then
printf '%s\n' "${symbol}${line:${#symbol}}"
shift
else
printf '%s\n' "$line"
fi
(( ++idx ))
done
}
batslib_decorate() {
echo
echo "-- $1 --"
cat -
echo '--'
echo
}
############################################################
assert() {
if ! "$@"; then
batslib_print_kv_single 10 'expression' "$*" \
| batslib_decorate 'assertion failed' \
| fail
fi
}
assert_equal() {
if [[ $1 != "$2" ]]; then
batslib_print_kv_single_or_multi 8 \
'expected' "$2" \
'actual' "$1" \
| batslib_decorate 'values do not equal' \
| fail
fi
}
assert_failure() {
: "${output?}"
: "${status?}"
(( $# > 0 )) && local -r expected="$1"
if (( status == 0 )); then
batslib_print_kv_single_or_multi 6 'output' "$output" \
| batslib_decorate 'command succeeded, but it was expected to fail' \
| fail
elif (( $# > 0 )) && (( status != expected )); then
{ local -ir width=8
batslib_print_kv_single "$width" \
'expected' "$expected" \
'actual' "$status"
batslib_print_kv_single_or_multi "$width" \
'output' "$output"
} \
| batslib_decorate 'command failed as expected, but status differs' \
| fail
fi
}
assert_line() {
local -i is_match_line=0
local -i is_mode_partial=0
local -i is_mode_regexp=0
: "${lines?}"
# Handle options.
while (( $# > 0 )); do
case "$1" in
-n|--index)
if (( $# < 2 )) || ! [[ $2 =~ ^([0-9]|[1-9][0-9]+)$ ]]; then
echo "\`--index' requires an integer argument: \`$2'" \
| batslib_decorate 'ERROR: assert_line' \
| fail
return $?
fi
is_match_line=1
local -ri idx="$2"
shift 2
;;
-p|--partial) is_mode_partial=1; shift ;;
-e|--regexp) is_mode_regexp=1; shift ;;
--) shift; break ;;
*) break ;;
esac
done
if (( is_mode_partial )) && (( is_mode_regexp )); then
echo "\`--partial' and \`--regexp' are mutually exclusive" \
| batslib_decorate 'ERROR: assert_line' \
| fail
return $?
fi
# Arguments.
local -r expected="$1"
if (( is_mode_regexp == 1 )) && [[ '' =~ $expected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$expected'" \
| batslib_decorate 'ERROR: assert_line' \
| fail
return $?
fi
# Matching.
if (( is_match_line )); then
# Specific line.
if (( is_mode_regexp )); then
if ! [[ ${lines[$idx]} =~ $expected ]]; then
batslib_print_kv_single 6 \
'index' "$idx" \
'regexp' "$expected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'regular expression does not match line' \
| fail
fi
elif (( is_mode_partial )); then
if [[ ${lines[$idx]} != *"$expected"* ]]; then
batslib_print_kv_single 9 \
'index' "$idx" \
'substring' "$expected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line does not contain substring' \
| fail
fi
else
if [[ ${lines[$idx]} != "$expected" ]]; then
batslib_print_kv_single 8 \
'index' "$idx" \
'expected' "$expected" \
'actual' "${lines[$idx]}" \
| batslib_decorate 'line differs' \
| fail
fi
fi
else
# Contained in output.
if (( is_mode_regexp )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} =~ $expected ]] && return 0
done
{ local -ar single=( 'regexp' "$expected" )
local -ar may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} \
| batslib_decorate 'no output line matches regular expression' \
| fail
elif (( is_mode_partial )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} == *"$expected"* ]] && return 0
done
{ local -ar single=( 'substring' "$expected" )
local -ar may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} \
| batslib_decorate 'no output line contains substring' \
| fail
else
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
[[ ${lines[$idx]} == "$expected" ]] && return 0
done
{ local -ar single=( 'line' "$expected" )
local -ar may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
batslib_print_kv_single_or_multi "$width" "${may_be_multi[@]}"
} \
| batslib_decorate 'output does not contain line' \
| fail
fi
fi
}
assert_output() {
local -i is_mode_partial=0
local -i is_mode_regexp=0
local -i is_mode_nonempty=0
local -i use_stdin=0
: "${output?}"
# Handle options.
if (( $# == 0 )); then
is_mode_nonempty=1
fi
while (( $# > 0 )); do
case "$1" in
-p|--partial) is_mode_partial=1; shift ;;
-e|--regexp) is_mode_regexp=1; shift ;;
-|--stdin) use_stdin=1; shift ;;
--) shift; break ;;
*) break ;;
esac
done
if (( is_mode_partial )) && (( is_mode_regexp )); then
echo "\`--partial' and \`--regexp' are mutually exclusive" \
| batslib_decorate 'ERROR: assert_output' \
| fail
return $?
fi
# Arguments.
local expected
if (( use_stdin )); then
expected="$(cat -)"
else
expected="${1-}"
fi
# Matching.
if (( is_mode_nonempty )); then
if [ -z "$output" ]; then
echo 'expected non-empty output, but output was empty' \
| batslib_decorate 'no output' \
| fail
fi
elif (( is_mode_regexp )); then
if [[ '' =~ $expected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$expected'" \
| batslib_decorate 'ERROR: assert_output' \
| fail
elif ! [[ $output =~ $expected ]]; then
batslib_print_kv_single_or_multi 6 \
'regexp' "$expected" \
'output' "$output" \
| batslib_decorate 'regular expression does not match output' \
| fail
fi
elif (( is_mode_partial )); then
if [[ $output != *"$expected"* ]]; then
batslib_print_kv_single_or_multi 9 \
'substring' "$expected" \
'output' "$output" \
| batslib_decorate 'output does not contain substring' \
| fail
fi
else
if [[ $output != "$expected" ]]; then
batslib_print_kv_single_or_multi 8 \
'expected' "$expected" \
'actual' "$output" \
| batslib_decorate 'output differs' \
| fail
fi
fi
}
assert_success() {
: "${output?}"
: "${status?}"
if (( status != 0 )); then
{ local -ir width=6
batslib_print_kv_single "$width" 'status' "$status"
batslib_print_kv_single_or_multi "$width" 'output' "$output"
} \
| batslib_decorate 'command failed' \
| fail
fi
}
refute() {
if "$@"; then
batslib_print_kv_single 10 'expression' "$*" \
| batslib_decorate 'assertion succeeded, but it was expected to fail' \
| fail
fi
}
refute_line() {
local -i is_match_line=0
local -i is_mode_partial=0
local -i is_mode_regexp=0
: "${lines?}"
# Handle options.
while (( $# > 0 )); do
case "$1" in
-n|--index)
if (( $# < 2 )) || ! [[ $2 =~ ^([0-9]|[1-9][0-9]+)$ ]]; then
echo "\`--index' requires an integer argument: \`$2'" \
| batslib_decorate 'ERROR: refute_line' \
| fail
return $?
fi
is_match_line=1
local -ri idx="$2"
shift 2
;;
-p|--partial) is_mode_partial=1; shift ;;
-e|--regexp) is_mode_regexp=1; shift ;;
--) shift; break ;;
*) break ;;
esac
done
if (( is_mode_partial )) && (( is_mode_regexp )); then
echo "\`--partial' and \`--regexp' are mutually exclusive" \
| batslib_decorate 'ERROR: refute_line' \
| fail
return $?
fi
# Arguments.
local -r unexpected="$1"
if (( is_mode_regexp == 1 )) && [[ '' =~ $unexpected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$unexpected'" \
| batslib_decorate 'ERROR: refute_line' \
| fail
return $?
fi
# Matching.
if (( is_match_line )); then
# Specific line.
if (( is_mode_regexp )); then
if [[ ${lines[$idx]} =~ $unexpected ]]; then
batslib_print_kv_single 6 \
'index' "$idx" \
'regexp' "$unexpected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'regular expression should not match line' \
| fail
fi
elif (( is_mode_partial )); then
if [[ ${lines[$idx]} == *"$unexpected"* ]]; then
batslib_print_kv_single 9 \
'index' "$idx" \
'substring' "$unexpected" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line should not contain substring' \
| fail
fi
else
if [[ ${lines[$idx]} == "$unexpected" ]]; then
batslib_print_kv_single 5 \
'index' "$idx" \
'line' "${lines[$idx]}" \
| batslib_decorate 'line should differ' \
| fail
fi
fi
else
# Line contained in output.
if (( is_mode_regexp )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} =~ $unexpected ]]; then
{ local -ar single=( 'regexp' "$unexpected" 'index' "$idx" )
local -a may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" | batslib_prefix | batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} \
| batslib_decorate 'no line should match the regular expression' \
| fail
return $?
fi
done
elif (( is_mode_partial )); then
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} == *"$unexpected"* ]]; then
{ local -ar single=( 'substring' "$unexpected" 'index' "$idx" )
local -a may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" | batslib_prefix | batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} \
| batslib_decorate 'no line should contain substring' \
| fail
return $?
fi
done
else
local -i idx
for (( idx = 0; idx < ${#lines[@]}; ++idx )); do
if [[ ${lines[$idx]} == "$unexpected" ]]; then
{ local -ar single=( 'line' "$unexpected" 'index' "$idx" )
local -a may_be_multi=( 'output' "$output" )
local -ir width="$( batslib_get_max_single_line_key_width "${single[@]}" "${may_be_multi[@]}" )"
batslib_print_kv_single "$width" "${single[@]}"
if batslib_is_single_line "${may_be_multi[1]}"; then
batslib_print_kv_single "$width" "${may_be_multi[@]}"
else
may_be_multi[1]="$( printf '%s' "${may_be_multi[1]}" | batslib_prefix | batslib_mark '>' "$idx" )"
batslib_print_kv_multi "${may_be_multi[@]}"
fi
} \
| batslib_decorate 'line should not be in output' \
| fail
return $?
fi
done
fi
fi
}
refute_output() {
local -i is_mode_partial=0
local -i is_mode_regexp=0
local -i is_mode_empty=0
local -i use_stdin=0
: "${output?}"
# Handle options.
if (( $# == 0 )); then
is_mode_empty=1
fi
while (( $# > 0 )); do
case "$1" in
-p|--partial) is_mode_partial=1; shift ;;
-e|--regexp) is_mode_regexp=1; shift ;;
-|--stdin) use_stdin=1; shift ;;
--) shift; break ;;
*) break ;;
esac
done
if (( is_mode_partial )) && (( is_mode_regexp )); then
echo "\`--partial' and \`--regexp' are mutually exclusive" \
| batslib_decorate 'ERROR: refute_output' \
| fail
return $?
fi
# Arguments.
local unexpected
if (( use_stdin )); then
unexpected="$(cat -)"
else
unexpected="${1-}"
fi
if (( is_mode_regexp == 1 )) && [[ '' =~ $unexpected ]] || (( $? == 2 )); then
echo "Invalid extended regular expression: \`$unexpected'" \
| batslib_decorate 'ERROR: refute_output' \
| fail
return $?
fi
# Matching.
if (( is_mode_empty )); then
if [ -n "$output" ]; then
batslib_print_kv_single_or_multi 6 \
'output' "$output" \
| batslib_decorate 'output non-empty, but expected no output' \
| fail
fi
elif (( is_mode_regexp )); then
if [[ $output =~ $unexpected ]]; then
batslib_print_kv_single_or_multi 6 \
'regexp' "$unexpected" \
'output' "$output" \
| batslib_decorate 'regular expression should not match output' \
| fail
fi
elif (( is_mode_partial )); then
if [[ $output == *"$unexpected"* ]]; then
batslib_print_kv_single_or_multi 9 \
'substring' "$unexpected" \
'output' "$output" \
| batslib_decorate 'output should not contain substring' \
| fail
fi
else
if [[ $output == "$unexpected" ]]; then
batslib_print_kv_single_or_multi 6 \
'output' "$output" \
| batslib_decorate 'output equals, but it was expected to differ' \
| fail
fi
fi
}

29
jq/luhn/bats-jq.bash Normal file
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@ -0,0 +1,29 @@
#!/usr/bin/env bash
#
# `bats-core` will consume both stdout and stderr for the `run` command's output.
# However `jq` prints its DEBUG output on stderr.
#
# Lines starting with `["DEBUG:",` will be prefixed with a hash and printed on file descriptor 3.
# Other lines on stderr will remain on stderr for bats to consume.
#
# See `bats-core` docs:
# - "Printing to the terminal", https://bats-core.readthedocs.io/en/stable/writing-tests.html#printing-to-the-terminal
# - "File descriptor 3", https://bats-core.readthedocs.io/en/stable/writing-tests.html#file-descriptor-3-read-this-if-bats-hangs
jq() {
local output stderr rc line
stderr=$(mktemp)
output=$(command jq "$@" 2> "$stderr")
rc=$?
while IFS= read -r line || [[ -n $line ]]; do
if [[ $line == '["DEBUG:",'* ]]; then
echo "# $line" >&3
else
echo "$line" >&2
fi
done < "$stderr"
rm -f "$stderr"
echo "$output"
return "$rc"
}

17
jq/luhn/luhn.jq Normal file
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@ -0,0 +1,17 @@
def luhn:
if ("\(.)" / "" | map(select(test("\\d"))))|length <=1 then false
elif .|test("^(\\d|\\s)+$")|not then false
else
("\(.)" / "" | map(select(test("\\d"))|tonumber)) as $s
| [range(0; $s|length)]
| map(
if . % 2 == 0 then (($s[.]) * 2 |(
if . > 9 then . - 9
end
))
end
)
| add
| . % 2 == 0
end;
.|luhn

224
jq/luhn/test-luhn.bats Normal file
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@ -0,0 +1,224 @@
#!/usr/bin/env bats
# generated on 2023-08-25T13:21:10Z
load bats-extra
load bats-jq
@test 'single digit strings can not be valid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"1"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'a single zero is invalid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"0"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'a simple valid SIN that remains valid if reversed' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"059"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'a simple valid SIN that becomes invalid if reversed' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"59"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'a valid Canadian SIN' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"055 444 285"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'invalid Canadian SIN' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"055 444 286"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'invalid credit card' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"8273 1232 7352 0569"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'invalid long number with an even remainder' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"1 2345 6789 1234 5678 9012"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'invalid long number with a remainder divisible by 5' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"1 2345 6789 1234 5678 9013"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'valid number with an even number of digits' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"095 245 88"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'valid number with an odd number of spaces' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"234 567 891 234"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'valid strings with a non-digit added at the end become invalid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"059a"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'valid strings with punctuation included become invalid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"055-444-285"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'valid strings with symbols included become invalid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"055# 444$ 285"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'single zero with space is invalid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '" 0"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'more than a single zero is valid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"0000 0"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'input digit 9 is correctly converted to output digit 9' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"091"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'very long input is valid' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"9999999999 9999999999 9999999999 9999999999"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'valid luhn with an odd number of digits and non zero first digit' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"109"'
assert_success
expected=true
assert_equal "$output" "$expected"
}
@test 'using ascii value for non-doubled non-digit isn'\''t allowed' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"055b 444 285"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'using ascii value for doubled non-digit isn'\''t allowed' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '":9"'
assert_success
expected=false
assert_equal "$output" "$expected"
}
@test 'non-numeric, non-space char in the middle with a sum that'\''s divisible by 10 isn'\''t allowed' {
#[[ $BATS_RUN_SKIPPED == "true" ]] || skip
run jq -r -f luhn.jq <<< '"59%59"'
assert_success
expected=false
assert_equal "$output" "$expected"
}