matching_brackets
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{
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"authors": [
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"jimmbraddock"
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],
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"contributors": [
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"angelikatyborska",
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"Cohen-Carlisle",
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"devonestes",
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"lex57ukr",
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"lpil",
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"neenjaw",
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"parkerl",
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"sotojuan",
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"waiting-for-dev",
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"workingjubilee"
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],
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"files": {
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"solution": [
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"lib/matching_brackets.ex"
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],
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"test": [
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"test/matching_brackets_test.exs"
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],
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"example": [
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".meta/example.ex"
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]
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},
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"blurb": "Make sure the brackets and braces all match.",
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"source": "Ginna Baker"
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}
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{"track":"elixir","exercise":"matching-brackets","id":"7934a9822b254a919f4aa9454f9c9455","url":"https://exercism.org/tracks/elixir/exercises/matching-brackets","handle":"negrienko","is_requester":true,"auto_approve":false}
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# Used by "mix format"
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[
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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bracket_push-*.tar
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# Help
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## Running the tests
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From the terminal, change to the base directory of the exercise then execute the tests with:
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```bash
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$ mix test
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```
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This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
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Documentation:
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* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
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* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
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## Pending tests
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In test suites of practice exercises, all but the first test have been tagged to be skipped.
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Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
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For example:
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```elixir
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# @tag :pending
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test "shouting" do
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assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
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end
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```
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If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
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```bash
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$ mix test --include pending
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```
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Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
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```elixir
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# ExUnit.configure(exclude: :pending, trace: true)
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```
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## Useful `mix test` options
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* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
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* `--failed` - runs only tests that failed the last time they ran
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* `--max-failures` - the suite stops evaluating tests when this number of test failures
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is reached
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* `--seed 0` - disables randomization so the tests in a single file will always be ran
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in the same order they were defined in
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## Submitting your solution
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You can submit your solution using the `exercism submit lib/matching_brackets.ex` command.
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This command will upload your solution to the Exercism website and print the solution page's URL.
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It's possible to submit an incomplete solution which allows you to:
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- See how others have completed the exercise
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- Request help from a mentor
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## Need to get help?
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If you'd like help solving the exercise, check the following pages:
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- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
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- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
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- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
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- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
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Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
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If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.
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# Matching Brackets
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Welcome to Matching Brackets on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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Given a string containing brackets `[]`, braces `{}`, parentheses `()`, or any combination thereof, verify that any and all pairs are matched and nested correctly.
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The string may also contain other characters, which for the purposes of this exercise should be ignored.
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## Source
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### Created by
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- @jimmbraddock
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### Contributed to by
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- @angelikatyborska
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- @Cohen-Carlisle
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- @devonestes
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- @lex57ukr
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- @lpil
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- @neenjaw
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- @parkerl
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- @sotojuan
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- @waiting-for-dev
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- @workingjubilee
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### Based on
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Ginna Baker
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defmodule MatchingBrackets do
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require Logger
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@opening_brackets ~w"[ { ("
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@closing_brackets ~w"] } )"
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@bracket_pairs Enum.zip(@closing_brackets, @opening_brackets)
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@doc """
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Checks that all the brackets and braces in the string are matched correctly, and nested correctly
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"""
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@spec check_brackets(String.t()) :: boolean
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def check_brackets(str), do: do_check_brackets(str, [])
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defguardp is_opening_bracket(char) when char in @opening_brackets
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defguardp is_closing_bracket(char) when char in @closing_brackets
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defguardp is_pair(closing, opening) when {closing, opening} in @bracket_pairs
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# Base cases
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defp do_check_brackets("", []), do: true
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defp do_check_brackets("", _any), do: false
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# Opening bracket
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defp do_check_brackets(<<opening::binary-size(1), str::binary>>, acc) when is_opening_bracket(opening), do: do_check_brackets(str, [opening | acc])
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# Closing bracket
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defp do_check_brackets(<<closing::binary-size(1), str::binary>>, [opening | tail]) when is_pair(closing, opening), do: do_check_brackets(str, tail)
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defp do_check_brackets(<<closing::binary-size(1), _str::binary>>, _acc) when is_closing_bracket(closing), do: false
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# Not a bracket
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defp do_check_brackets(<<_char::binary-size(1), str::binary>>, acc), do: do_check_brackets(str, acc)
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end
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defmodule MatchingBrackets.MixProject do
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use Mix.Project
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def project do
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[
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app: :matching_brackets,
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version: "0.1.0",
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# elixir: "~> 1.8",
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start_permanent: Mix.env() == :prod,
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deps: deps()
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]
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end
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# Run "mix help compile.app" to learn about applications.
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def application do
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[
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extra_applications: [:logger]
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]
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end
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# Run "mix help deps" to learn about dependencies.
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defp deps do
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[
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# {:dep_from_hexpm, "~> 0.3.0"},
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# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
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]
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end
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end
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defmodule MatchingBracketsTest do
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use ExUnit.Case
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test "paired square brackets" do
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assert MatchingBrackets.check_brackets("[]")
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end
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test "empty string" do
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assert MatchingBrackets.check_brackets("")
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end
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test "unpaired brackets" do
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refute MatchingBrackets.check_brackets("[[")
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end
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test "wrong ordered brackets" do
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refute MatchingBrackets.check_brackets("}{")
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end
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test "wrong closing bracket" do
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refute MatchingBrackets.check_brackets("{]")
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end
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test "paired with whitespace" do
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assert MatchingBrackets.check_brackets("{ }")
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end
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test "partially paired brackets" do
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refute MatchingBrackets.check_brackets("{[])")
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end
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test "simple nested brackets" do
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assert MatchingBrackets.check_brackets("{[]}")
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end
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test "several paired brackets" do
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assert MatchingBrackets.check_brackets("{}[]")
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end
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test "paired and nested brackets" do
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assert MatchingBrackets.check_brackets("([{}({}[])])")
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end
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test "unopened closing brackets" do
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refute MatchingBrackets.check_brackets("{[)][]}")
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end
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test "unpaired and nested brackets" do
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refute MatchingBrackets.check_brackets("([{])")
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end
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test "paired and wrong nested brackets" do
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refute MatchingBrackets.check_brackets("[({]})")
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end
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test "paired and wrong nested brackets but innermost are correct" do
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refute MatchingBrackets.check_brackets("[({}])")
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end
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test "paired and incomplete brackets" do
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refute MatchingBrackets.check_brackets("{}[")
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end
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test "too many closing brackets" do
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refute MatchingBrackets.check_brackets("[]]")
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end
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test "early unexpected brackets" do
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refute MatchingBrackets.check_brackets(")()")
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end
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test "early mismatched brackets" do
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refute MatchingBrackets.check_brackets("{)()")
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end
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test "math expression" do
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assert MatchingBrackets.check_brackets("(((185 + 223.85) * 15) - 543)/2")
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end
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test "complex latex expression" do
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assert MatchingBrackets.check_brackets(
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"\\left(\\begin{array}{cc} \\frac{1}{3} & x\\\\ \\mathrm{e}^{x} &... x^2 \\end{array}\\right)"
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)
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end
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end
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ExUnit.start()
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ExUnit.configure(exclude: :pending, trace: true)
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