https://github.com/plokhotnyuk/expression-evaluator

Compile-time expression evaluation for Scala 2
https://github.com/plokhotnyuk/expression-evaluator

compile-time eval expression-evaluator macro scala

Last synced: 4 months ago
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Compile-time expression evaluation for Scala 2

• Host: GitHub
• URL: https://github.com/plokhotnyuk/expression-evaluator
• Owner: plokhotnyuk
• License: apache-2.0
• Created: 2019-05-10T05:04:13.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2025-03-06T05:49:26.000Z (4 months ago)
• Last Synced: 2025-03-17T21:43:34.372Z (4 months ago)
• Topics: compile-time, eval, expression-evaluator, macro, scala
• Language: Scala
• Homepage:
• Size: 161 KB
• Stars: 15
• Watchers: 2
• Forks: 2
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Expression Evaluator

[![Actions Build](https://github.com/plokhotnyuk/expression-evaluator/workflows/build/badge.svg)](https://github.com/plokhotnyuk/expression-evaluator/actions)

[![Scala Steward](https://img.shields.io/badge/Scala_Steward-helping-brightgreen.svg?style=flat&logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAQCAMAAAARSr4IAAAAVFBMVEUAAACHjojlOy5NWlrKzcYRKjGFjIbp293YycuLa3pYY2LSqql4f3pCUFTgSjNodYRmcXUsPD/NTTbjRS+2jomhgnzNc223cGvZS0HaSD0XLjbaSjElhIr+AAAAAXRSTlMAQObYZgAAAHlJREFUCNdNyosOwyAIhWHAQS1Vt7a77/3fcxxdmv0xwmckutAR1nkm4ggbyEcg/wWmlGLDAA3oL50xi6fk5ffZ3E2E3QfZDCcCN2YtbEWZt+Drc6u6rlqv7Uk0LdKqqr5rk2UCRXOk0vmQKGfc94nOJyQjouF9H/wCc9gECEYfONoAAAAASUVORK5CYII=)](https://scala-steward.org)

[![Maven Central](https://img.shields.io/badge/maven--central-0.1.3-blue.svg)](https://search.maven.org/search?q=com.github.plokhotnyuk.expression-evaluator)

Compile-time expression evaluation for Scala

## How to use

Add the library with a "provided" scope to your dependencies list:

```sbt

libraryDependencies ++= Seq(

  "com.github.plokhotnyuk.expression-evaluator" %% "expression-evaluator" % "0.1.3" % Provided // required only in compile-time

)

```

Generate expression results for primitives, strings, `BigInt`, `java.time.ZoneId`, `java.time.ZoneOffset`, and arrays of

them:

    

```scala

import com.github.plokhotnyuk.expression_evaluator._

object Constants {

  val x = eval(10 * 10 * 10)

  val xs = eval((1 to 3).toArray)

}

```

To see generated code for expression results

```sbt

scalacOptions ++= Seq("-Xmacro-settings:print-expr-results")

```

## How to contribute

### Build and test

To compile, run tests, check coverage, and check binary compatibility for different Scala versions use a command:

```sh

sbt clean +coverage +test +coverageReport +mimaReportBinaryIssues

```

BEWARE: expression-evaluator is included into [Scala Community Build](https://github.com/scala/community-builds)

for 2.11.x, 2.12.x, and 2.13.x versions of Scala.

### Publish locally

Publish to the local Ivy repo:

```sh

sbt +publishLocal

```

Publish to the local Maven repo:

```sh

sbt +publishM2

```

### Release

For version numbering use [Recommended Versioning Scheme](http://docs.scala-lang.org/overviews/core/binary-compatibility-for-library-authors.html#recommended-versioning-scheme)

that is used in the Scala ecosystem.

Double check binary and source compatibility (including behavior) and run `release` command (credentials required):

```sh

sbt release

```