[gleam] complete wordy

Author: joaofnds

gleam/wordy/.gitignore

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+*.beam
+*.ez
+build
+erl_crash.dump

gleam/wordy/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests, run the command `gleam test` from within the exercise directory.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/wordy.gleam` 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 [Gleam track's documentation](https://exercism.org/docs/tracks/gleam)
+- The [Gleam track's programming category on the forum](https://forum.exercism.org/c/programming/gleam)
+- [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.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [gleam.run](https://gleam.run/documentation/) is the gleam official documentation.
+- [Discord](https://discord.gg/Fm8Pwmy) is the discord channel.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/gleam) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

gleam/wordy/README.md

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+# Wordy
+
+Welcome to Wordy on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Parse and evaluate simple math word problems returning the answer as an integer.
+
+## Iteration 0 — Numbers
+
+Problems with no operations simply evaluate to the number given.
+
+> What is 5?
+
+Evaluates to 5.
+
+## Iteration 1 — Addition
+
+Add two numbers together.
+
+> What is 5 plus 13?
+
+Evaluates to 18.
+
+Handle large numbers and negative numbers.
+
+## Iteration 2 — Subtraction, Multiplication and Division
+
+Now, perform the other three operations.
+
+> What is 7 minus 5?
+
+2
+
+> What is 6 multiplied by 4?
+
+24
+
+> What is 25 divided by 5?
+
+5
+
+## Iteration 3 — Multiple Operations
+
+Handle a set of operations, in sequence.
+
+Since these are verbal word problems, evaluate the expression from left-to-right, _ignoring the typical order of operations._
+
+> What is 5 plus 13 plus 6?
+
+24
+
+> What is 3 plus 2 multiplied by 3?
+
+15 (i.e. not 9)
+
+## Iteration 4 — Errors
+
+The parser should reject:
+
+- Unsupported operations ("What is 52 cubed?")
+- Non-math questions ("Who is the President of the United States")
+- Word problems with invalid syntax ("What is 1 plus plus 2?")
+
+## Source
+
+### Created by
+
+- @natanaelsirqueira
+
+### Based on
+
+Inspired by one of the generated questions in the Extreme Startup game. - https://github.com/rchatley/extreme_startup

gleam/wordy/gleam.toml

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+name = "wordy"
+version = "0.1.0"
+
+[dependencies]
+gleam_bitwise = "~> 1.2"
+gleam_otp = "~> 0.7 or ~> 1.0"
+gleam_stdlib = "~> 0.32 or ~> 1.0"
+simplifile = "~> 1.0"
+gleam_erlang = ">= 0.25.0 and < 1.0.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.4"

gleam/wordy/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "exercism_test_runner", version = "1.8.0", build_tools = ["gleam"], requirements = ["argv", "gap", "glance", "gleam_community_ansi", "gleam_erlang", "gleam_json", "gleam_stdlib", "simplifile"], otp_app = "exercism_test_runner", source = "hex", outer_checksum = "B944D89A9D049897DF28C63D595D89CB54D8C407D06EFFCE4CDA8C3EC1C9F51E" },
+  { name = "filepath", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "EFB6FF65C98B2A16378ABC3EE2B14124168C0CE5201553DE652E2644DCFDB594" },
+  { name = "gap", version = "1.1.3", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "6EF5E3B523FDFBC317E9EA28D5163EE04744A97C007106F90207569789612291" },
+  { name = "glance", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "1510D4A03C28880E62974389E5BF1A5A185036BA07392F1D769620706A9E042F" },
+  { name = "gleam_bitwise", version = "1.3.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_bitwise", source = "hex", outer_checksum = "B36E1D3188D7F594C7FD4F43D0D2CE17561DE896202017548578B16FE1FE9EFC" },
+  { name = "gleam_community_ansi", version = "1.4.1", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "4CD513FC62523053E62ED7BAC2F36136EC17D6A8942728250A9A00A15E340E4B" },
+  { name = "gleam_community_colour", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "795964217EBEDB3DA656F5EB8F67D7AD22872EB95182042D3E7AFEF32D3FD2FE" },
+  { name = "gleam_erlang", version = "0.27.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "DE468F676D71B313C6C8C5334425CFCF827837333F8AB47B64D8A6D7AA40185D" },
+  { name = "gleam_json", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "9063D14D25406326C0255BDA0021541E797D8A7A12573D849462CAFED459F6EB" },
+  { name = "gleam_otp", version = "0.12.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "BFACC1513410DF5A1617169A9CD7EA334973AC71D860A17574BA7B2EADD89A6F" },
+  { name = "gleam_stdlib", version = "0.40.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "86606B75A600BBD05E539EB59FABC6E307EEEA7B1E5865AFB6D980A93BCB2181" },
+  { name = "glexer", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "BD477AD657C2B637FEF75F2405FAEFFA533F277A74EF1A5E17B55B1178C228FB" },
+  { name = "simplifile", version = "1.7.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "1D5DFA3A2F9319EC85825F6ED88B8E449F381B0D55A62F5E61424E748E7DDEB0" },
+  { name = "thoas", version = "1.2.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "E38697EDFFD6E91BD12CEA41B155115282630075C2A727E7A6B2947F5408B86A" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.4" }
+gleam_bitwise = { version = "~> 1.2" }
+gleam_erlang = { version = ">= 0.25.0 and < 1.0.0" }
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_stdlib = { version = "~> 0.32 or ~> 1.0" }
+simplifile = { version = "~> 1.0" }

gleam/wordy/src/wordy.gleam

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+import gleam/bool
+import gleam/int
+import gleam/list
+import gleam/regex
+import gleam/string
+
+pub type Error {
+  SyntaxError
+  UnknownOperation
+  ImpossibleOperation
+}
+
+pub fn answer(question: String) -> Result(Int, Error) {
+  use <- bool.guard(
+    string.starts_with(question, "Who") || string.ends_with(question, "cubed?"),
+    Error(UnknownOperation),
+  )
+
+  let assert Ok(re) =
+    regex.from_string(
+      "^What is (-?\\d+)( (plus|minus|multiplied by|divided by) (-?\\d+))*\\?$",
+    )
+
+  use <- bool.guard(!regex.check(re, question), Error(SyntaxError))
+
+  question
+  |> string.replace("What is", "plus")
+  |> string.replace(" by", "")
+  |> string.drop_right(1)
+  |> string.split(" ")
+  |> list.sized_chunk(2)
+  |> list.try_fold(0, fn(res, pair) {
+    let assert [op, num_str] = pair
+    let assert Ok(num) = int.parse(num_str)
+    apply(res, num, op)
+  })
+}
+
+fn apply(a: Int, b: Int, op: String) -> Result(Int, Error) {
+  case op {
+    "plus" -> Ok(a + b)
+    "minus" -> Ok(a - b)
+    "multiplied" -> Ok(a * b)
+    "divided" if b == 0 -> Error(ImpossibleOperation)
+    "divided" -> Ok(a / b)
+    _ -> Error(SyntaxError)
+  }
+}

gleam/wordy/test/wordy_test.gleam

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+import exercism/should
+import exercism/test_runner
+import wordy.{ImpossibleOperation, SyntaxError, UnknownOperation}
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn just_a_number_test() {
+  wordy.answer("What is 5?")
+  |> should.equal(Ok(5))
+}
+
+pub fn addition_test() {
+  wordy.answer("What is 1 plus 1?")
+  |> should.equal(Ok(2))
+}
+
+pub fn more_addition_test() {
+  wordy.answer("What is 53 plus 2?")
+  |> should.equal(Ok(55))
+}
+
+pub fn addition_with_negative_numbers_test() {
+  wordy.answer("What is -1 plus -10?")
+  |> should.equal(Ok(-11))
+}
+
+pub fn large_addition_test() {
+  wordy.answer("What is 123 plus 45678?")
+  |> should.equal(Ok(45_801))
+}
+
+pub fn subtraction_test() {
+  wordy.answer("What is 4 minus -12?")
+  |> should.equal(Ok(16))
+}
+
+pub fn multiplication_test() {
+  wordy.answer("What is -3 multiplied by 25?")
+  |> should.equal(Ok(-75))
+}
+
+pub fn division_test() {
+  wordy.answer("What is 33 divided by -3?")
+  |> should.equal(Ok(-11))
+}
+
+pub fn multiple_additions_test() {
+  wordy.answer("What is 1 plus 1 plus 1?")
+  |> should.equal(Ok(3))
+}
+
+pub fn addition_and_subtraction_test() {
+  wordy.answer("What is 1 plus 5 minus -2?")
+  |> should.equal(Ok(8))
+}
+
+pub fn multiple_subtraction_test() {
+  wordy.answer("What is 20 minus 4 minus 13?")
+  |> should.equal(Ok(3))
+}
+
+pub fn subtraction_then_addition_test() {
+  wordy.answer("What is 17 minus 6 plus 3?")
+  |> should.equal(Ok(14))
+}
+
+pub fn multiple_multiplication_test() {
+  wordy.answer("What is 2 multiplied by -2 multiplied by 3?")
+  |> should.equal(Ok(-12))
+}
+
+pub fn addition_and_multiplication_test() {
+  wordy.answer("What is -3 plus 7 multiplied by -2?")
+  |> should.equal(Ok(-8))
+}
+
+pub fn multiple_division_test() {
+  wordy.answer("What is -12 divided by 2 divided by -3?")
+  |> should.equal(Ok(2))
+}
+
+pub fn unknown_operation_test() {
+  wordy.answer("What is 52 cubed?")
+  |> should.equal(Error(UnknownOperation))
+}
+
+pub fn non_math_question_test() {
+  wordy.answer("Who is the President of the United States?")
+  |> should.equal(Error(UnknownOperation))
+}
+
+pub fn reject_problem_missing_an_operand_test() {
+  wordy.answer("What is 1 plus?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_problem_with_no_operands_or_operators_test() {
+  wordy.answer("What is?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_two_operations_in_a_row_test() {
+  wordy.answer("What is 1 plus plus 2?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_two_numbers_in_a_row_test() {
+  wordy.answer("What is 1 plus 2 1?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_postfix_notation_test() {
+  wordy.answer("What is 1 2 plus?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_prefix_notation_test() {
+  wordy.answer("What is plus 1 2?")
+  |> should.equal(Error(SyntaxError))
+}
+
+pub fn reject_division_by_zero_test() {
+  wordy.answer("What is 1 divided by 0?")
+  |> should.equal(Error(ImpossibleOperation))
+}