reduce-function-call

What is reduce-function-call?

The reduce-function-call npm package allows you to reduce the arguments of a function call within a string. This can be particularly useful for processing CSS functions or other string-based function calls.

What are reduce-function-call's main functionalities?

Reduce CSS function calls

This feature allows you to reduce the arguments of CSS function calls. In this example, the `calc` function call is reduced to a simpler form.

const reduceFunctionCall = require('reduce-function-call');

const input = 'calc(100% - 50px)';
const output = reduceFunctionCall(input, 'calc', (body) => {
  return '50%';
});
console.log(output); // 'calc(50%)'

Custom function call reduction

You can use this feature to reduce custom function calls within a string. In this example, the `myFunc` function call is reduced to a single argument.

const reduceFunctionCall = require('reduce-function-call');

const input = 'myFunc(1, 2, 3)';
const output = reduceFunctionCall(input, 'myFunc', (body) => {
  return '4';
});
console.log(output); // 'myFunc(4)'

Other packages similar to reduce-function-call

postcss-calc

The postcss-calc package is a PostCSS plugin that reduces calc() references in CSS. It is specifically designed for CSS and provides more advanced optimizations for calc() functions compared to reduce-function-call.

cssnano

cssnano is a modular minifier for CSS that includes a variety of optimizations, including reducing calc() functions. It offers a broader range of CSS optimizations beyond just function call reductions.

README

reduce-function-call

Reduce function calls in a string, using a callback

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Professionally supported reduce-function-call is now available

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Installation

npm install reduce-function-call

Usage

var reduceFunctionCall = require("reduce-function-call")

reduceFunctionCall("foo(1)", "foo", function(body) {
  // body === "1"
  return parseInt(body, 10) + 1
})
// "2"

var nothingOrUpper = function(body, functionIdentifier) {
  // ignore empty value
  if (body === "") {
    return functionIdentifier + "()"
  }

  return body.toUpperCase()
}

reduceFunctionCall("bar()", "bar", nothingOrUpper)
// "bar()"

reduceFunctionCall("upper(baz)", "upper", nothingOrUpper)
// "BAZ"

reduceFunctionCall("math(math(2 + 2) * 4 + math(2 + 2)) and other things", "math", function(body, functionIdentifier, call) {
  try {
    return eval(body)
  }
  catch (e) {
    return call
  }
})
// "20 and other things"

reduceFunctionCall("sha bla blah() blaa bla() abla() aabla() blaaa()", /\b([a-z]?bla[a-z]?)\(/, function(body, functionIdentifier) {
  if (functionIdentifier === "bla") {
    return "ABRACADABRA"
  }
  return functionIdentifier.replace("bla", "!")
}
// "sha bla !h blaa ABRACADABRA a! aabla() blaaa()"

See unit tests for others examples.

Contributing

Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.

git clone https://github.com/MoOx/reduce-function-call.git
git checkout -b patch-1
npm install
npm test

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Changelog

License

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Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.