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Add matching-brackets exercise #96

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8 changes: 8 additions & 0 deletions config.json
Original file line number Diff line number Diff line change
Expand Up @@ -255,6 +255,14 @@
"prerequisites": [],
"difficulty": 3
},
{
"slug": "matching-brackets",
"name": "Matching Brackets",
"uuid": "5c7dbb9d-8816-4bbb-ba33-057ecf4f6329",
"practices": [],
"prerequisites": [],
"difficulty": 3
},
{
"slug": "pangram",
"name": "Pangram",
Expand Down
5 changes: 5 additions & 0 deletions exercises/practice/matching-brackets/.docs/instructions.md
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# Instructions

Given a string containing brackets `[]`, braces `{}`, parentheses `()`, or any combination thereof, verify that any and all pairs are matched and nested correctly.
Any other characters should be ignored.
For example, `"{what is (42)}?"` is balanced and `"[text}"` is not.
8 changes: 8 additions & 0 deletions exercises/practice/matching-brackets/.docs/introduction.md
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@@ -0,0 +1,8 @@
# Introduction

You're given the opportunity to write software for the Bracketeer™, an ancient but powerful mainframe.
The software that runs on it is written in a proprietary language.
Much of its syntax is familiar, but you notice _lots_ of brackets, braces and parentheses.
Despite the Bracketeer™ being powerful, it lacks flexibility.
If the source code has any unbalanced brackets, braces or parentheses, the Bracketeer™ crashes and must be rebooted.
To avoid such a scenario, you start writing code that can verify that brackets, braces, and parentheses are balanced before attempting to run it on the Bracketeer™.
25 changes: 25 additions & 0 deletions exercises/practice/matching-brackets/.meta/Example.roc
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module [isPaired]

isPaired : Str -> Bool
isPaired = \string ->
isOpen = \c -> c == '[' || c == '(' || c == '{'
isClose = \c -> c == ']' || c == ')' || c == '}'
isMatch = \pair -> pair == ('[', ']') || pair == ('(', ')') || pair == ('{', '}')
help = \openBrackets, remainingChars ->
when remainingChars is
[] -> List.isEmpty openBrackets # ok or missing closing bracket
[nextChar, .. as restChars] ->
if isOpen nextChar then
help (openBrackets |> List.append nextChar) restChars
else if isClose nextChar then
when openBrackets is
[] -> Bool.false # missing opening bracket
[.. as previousOpens, lastOpen] ->
if isMatch (lastOpen, nextChar) then
help previousOpens restChars
else
Bool.false # mismatching brackets
else
help openBrackets restChars

help [] (string |> Str.toUtf8)
18 changes: 18 additions & 0 deletions exercises/practice/matching-brackets/.meta/config.json
Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
{
"authors": [
"ageron"
],
"files": {
"solution": [
"MatchingBrackets.roc"
],
"test": [
"matching-brackets-test.roc"
],
"example": [
".meta/Example.roc"
]
},
"blurb": "Make sure the brackets and braces all match.",
"source": "Ginna Baker"
}
13 changes: 13 additions & 0 deletions exercises/practice/matching-brackets/.meta/template.j2
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{%- import "generator_macros.j2" as macros with context -%}
{{ macros.canonical_ref() }}
{{ macros.header() }}

import {{ exercise | to_pascal }} exposing [{{ cases[0]["property"] | to_camel }}]

{% for case in cases -%}
# {{ case["description"] }}
expect
result = {{ case["input"]["value"] | to_roc }} |> {{ case["property"] | to_camel }}
result == {{ case["expected"] | to_roc }}

{% endfor %}
70 changes: 70 additions & 0 deletions exercises/practice/matching-brackets/.meta/tests.toml
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# This is an auto-generated file.
#
# Regenerating this file via `configlet sync` will:
# - Recreate every `description` key/value pair
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
# - Preserve any other key/value pair
#
# As user-added comments (using the # character) will be removed when this file
# is regenerated, comments can be added via a `comment` key.

[81ec11da-38dd-442a-bcf9-3de7754609a5]
description = "paired square brackets"

[287f0167-ac60-4b64-8452-a0aa8f4e5238]
description = "empty string"

[6c3615a3-df01-4130-a731-8ef5f5d78dac]
description = "unpaired brackets"

[9d414171-9b98-4cac-a4e5-941039a97a77]
description = "wrong ordered brackets"

[f0f97c94-a149-4736-bc61-f2c5148ffb85]
description = "wrong closing bracket"

[754468e0-4696-4582-a30e-534d47d69756]
description = "paired with whitespace"

[ba84f6ee-8164-434a-9c3e-b02c7f8e8545]
description = "partially paired brackets"

[3c86c897-5ff3-4a2b-ad9b-47ac3a30651d]
description = "simple nested brackets"

[2d137f2c-a19e-4993-9830-83967a2d4726]
description = "several paired brackets"

[2e1f7b56-c137-4c92-9781-958638885a44]
description = "paired and nested brackets"

[84f6233b-e0f7-4077-8966-8085d295c19b]
description = "unopened closing brackets"

[9b18c67d-7595-4982-b2c5-4cb949745d49]
description = "unpaired and nested brackets"

[a0205e34-c2ac-49e6-a88a-899508d7d68e]
description = "paired and wrong nested brackets"

[1d5c093f-fc84-41fb-8c2a-e052f9581602]
description = "paired and wrong nested brackets but innermost are correct"

[ef47c21b-bcfd-4998-844c-7ad5daad90a8]
description = "paired and incomplete brackets"

[a4675a40-a8be-4fc2-bc47-2a282ce6edbe]
description = "too many closing brackets"

[a345a753-d889-4b7e-99ae-34ac85910d1a]
description = "early unexpected brackets"

[21f81d61-1608-465a-b850-baa44c5def83]
description = "early mismatched brackets"

[99255f93-261b-4435-a352-02bdecc9bdf2]
description = "math expression"

[8e357d79-f302-469a-8515-2561877256a1]
description = "complex latex expression"
5 changes: 5 additions & 0 deletions exercises/practice/matching-brackets/MatchingBrackets.roc
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module [isPaired]

isPaired : Str -> Bool
isPaired = \string ->
crash "Please implement the 'isPaired' function"
112 changes: 112 additions & 0 deletions exercises/practice/matching-brackets/matching-brackets-test.roc
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# These tests are auto-generated with test data from:
# https://github.com/exercism/problem-specifications/tree/main/exercises/matching-brackets/canonical-data.json
# File last updated on 2024-09-16
app [main] {
pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.15.0/SlwdbJ-3GR7uBWQo6zlmYWNYOxnvo8r6YABXD-45UOw.tar.br",
}

main =
Task.ok {}

import MatchingBrackets exposing [isPaired]

# paired square brackets
expect
result = "[]" |> isPaired
result == Bool.true

# empty string
expect
result = "" |> isPaired
result == Bool.true

# unpaired brackets
expect
result = "[[" |> isPaired
result == Bool.false

# wrong ordered brackets
expect
result = "}{" |> isPaired
result == Bool.false

# wrong closing bracket
expect
result = "{]" |> isPaired
result == Bool.false

# paired with whitespace
expect
result = "{ }" |> isPaired
result == Bool.true

# partially paired brackets
expect
result = "{[])" |> isPaired
result == Bool.false

# simple nested brackets
expect
result = "{[]}" |> isPaired
result == Bool.true

# several paired brackets
expect
result = "{}[]" |> isPaired
result == Bool.true

# paired and nested brackets
expect
result = "([{}({}[])])" |> isPaired
result == Bool.true

# unopened closing brackets
expect
result = "{[)][]}" |> isPaired
result == Bool.false

# unpaired and nested brackets
expect
result = "([{])" |> isPaired
result == Bool.false

# paired and wrong nested brackets
expect
result = "[({]})" |> isPaired
result == Bool.false

# paired and wrong nested brackets but innermost are correct
expect
result = "[({}])" |> isPaired
result == Bool.false

# paired and incomplete brackets
expect
result = "{}[" |> isPaired
result == Bool.false

# too many closing brackets
expect
result = "[]]" |> isPaired
result == Bool.false

# early unexpected brackets
expect
result = ")()" |> isPaired
result == Bool.false

# early mismatched brackets
expect
result = "{)()" |> isPaired
result == Bool.false

# math expression
expect
result = "(((185 + 223.85) * 15) - 543)/2" |> isPaired
result == Bool.true

# complex latex expression
expect
result = "\\left(\\begin{array}{cc} \\frac{1}{3} & x\\\\ \\mathrm{e}^{x} &... x^2 \\end{array}\\right)" |> isPaired
result == Bool.true