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counteraction

v1.3.2

Published

Compute CSS list-style-type and @counter-style values

Downloads

5,646

Readme

counteraction

Build Status

Coverage Status

Implementations of most of the counter types supported by the list-style-type CSS property as well as the numbering systems allowed by @counter-style.

Many of the renderers are based on CLDR with the code generated by the cldr module (see extractRbnfFunctionByType).

Installation

npm install counteraction

Supported renderers

Simple list-style-type renderers (option-less):

  • armenian
  • decimal
  • decimal-leading-zero
  • ethiopic
  • georgian
  • hebrew
  • lower-alpha
  • lower-greek
  • lower-latin
  • lower-roman
  • tamil
  • upper-alpha
  • upper-greek
  • upper-latin
  • upper-roman

These bogus ones are there for completeness:

  • disc (renders a regardless of the value)
  • none (renders the empty string regardless of the value)

More complex @counter-system renderers:

  • alphabetic
  • additive
  • cyclic
  • fixed
  • symbolic
  • numeric

Example

The simple counter renderers are instantiated by their name and don't need any options:

const counteraction = require('counteraction');

const renderer = counteraction('lower-roman');
console.log(renderer.render(123)); // cxxiii
cxxiii

The @counter-system ones are created by their system name and accept an options object that corresponds to the CSS properties of the @counter-style declaration:

const renderer = counteraction('alphabetic', {
  symbols: ['X', 'Y', 'Z'],
});
console.log(renderer.render(123)); // XXXXZ
XXXXZ

The name (system) can also be passed as a separate property instead of the name parameter. That might be easier if you're working with a parsed representation of the whole @counter-style declaration:

const renderer = counteraction({
  system: 'alphabetic',
  symbols: ['X', 'Y', 'Z'],
});
console.log(renderer.render(123)); // XXXXZ
XXXXZ

They also support a fallback option to be used when the value is out of range. It can be passed as either a renderer instance or the name of a list-style-type renderer:

const renderer = counteraction('fixed', {
  symbols: ['X', 'Y', 'Z'],
  fallback: 'disc',
});
console.log(renderer.render(3)); // Z
console.log(renderer.render(4)); // •
Z
•

The fallback option can also be passed as another renderer instance, or "lazily" as a function that returns either a list-style-type name or a renderer.