Initial commit

.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: "26.0.2"
+          gleam-version: "1.5.0"
+          rebar3-version: "3"
+          # elixir-version: "1.15.4"
+      - run: gleam deps download
+      - run: gleam test
+      - run: gleam format --check src test

.gitignore

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

README.md

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+# lenient_parse
+
+[![Package Version](https://img.shields.io/hexpm/v/lenient_parse)](https://hex.pm/packages/lenient_parse)
+[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/lenient_parse/)
+
+```sh
+gleam add lenient_parse@1
+```
+```gleam
+import lenient_parse
+
+pub fn main() {
+  // TODO: An example of the project in use
+}
+```
+
+Further documentation can be found at <https://hexdocs.pm/lenient_parse>.
+
+## Development
+
+```sh
+gleam run   # Run the project
+gleam test  # Run the tests
+```

gleam.toml

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+name = "lenient_parse"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "", repo = "" }
+# links = [{ title = "Website", href = "" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/.
+
+[dependencies]
+gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"

manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_stdlib", version = "0.40.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "86606B75A600BBD05E539EB59FABC6E307EEEA7B1E5865AFB6D980A93BCB2181" },
+  { name = "gleeunit", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "F7A7228925D3EE7D0813C922E062BFD6D7E9310F0BEE585D3A42F3307E3CFD13" },
+]
+
+[requirements]
+gleam_stdlib = { version = ">= 0.34.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }

src/lenient_parse.gleam

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+import gleam/bool
+import gleam/float
+import gleam/int
+import gleam/result
+import gleam/string
+
+/// Converts a string to a float using a more lenient parsing method than gleam's `float.parse()`. It behaves similarly to Python's `float()` built-in function.
+///
+/// It attempts to parse the input string in the following order:
+/// 1. As a standard float
+/// 2. As an integer (which is then converted to a float)
+/// 3. As a float with leading or trailing decimal point
+///
+/// ## Examples
+///
+/// ```gleam
+/// lenient_parse.to_float("3.14") // -> Ok(3.14)
+/// lenient_parse.to_float("42")   // -> Ok(42.0)
+/// lenient_parse.to_float(".5")   // -> Ok(0.5)
+/// lenient_parse.to_float("2.")   // -> Ok(2.0)
+/// lenient_parse.to_float("dog")  // -> Error(Nil)
+/// ```
+pub fn to_float(text: String) -> Result(Float, Nil) {
+  let text = text |> string.trim
+
+  use <- bool.guard(text |> string.is_empty, Error(Nil))
+  use _ <- result.try_recover(text |> float.parse)
+  use _ <- result.try_recover(text |> int.parse |> result.map(int.to_float))
+
+  case string.first(text), string.last(text) {
+    Ok("."), _ -> float.parse("0" <> text)
+    _, Ok(".") -> float.parse(text <> "0")
+    _, _ -> Error(Nil)
+  }
+}
+// TODO: Update doc comment with rules and examples

test/lenient_parse_test.gleam

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+import gleeunit
+import gleeunit/should
+import lenient_parse
+
+pub fn main() {
+  gleeunit.main()
+}
+
+pub fn to_float_standard_format_test() {
+  "1.001"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.001))
+
+  "1.00"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+
+  "1.0"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+
+  "0.1"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(0.1))
+
+  "+123.321"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(123.321))
+
+  "-123.321"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(-123.321))
+}
+
+pub fn to_float_int_test() {
+  "1"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+}
+
+pub fn to_float_leading_trailing_dot_test() {
+  "1."
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+
+  ".1"
+  |> lenient_parse.to_float
+  |> should.equal(Ok(0.1))
+}
+
+pub fn to_float_whitespace_test() {
+  " 1 "
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+
+  " 1.0 "
+  |> lenient_parse.to_float
+  |> should.equal(Ok(1.0))
+}
+
+// TODO: scientific notation
+// pub fn to_float_scientific_notation_test() {
+//   // "420e3"
+//   // |> lenient_parse.to_float
+//   // |> should.equal(Ok(1e10))
+
+//   // "420e-3"
+//   // |> lenient_parse.to_float
+//   // |> should.equal(Ok(-2.5e-3))
+// }
+
+pub fn to_float_shouldnt_parse_test() {
+  "..1"
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  "1.."
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  ".1."
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  "."
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  " "
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  ""
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+
+  "abc"
+  |> lenient_parse.to_float
+  |> should.equal(Error(Nil))
+}