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Description:

list counter

A Counter class that follows the specification outlined at https://www.w3.org/TR/css-lists-3/#auto-numbering.
The CounterStyle class represents styles that can be used to generate a
text representation of the given counter's value (such as a 'iv' for 4,
or 'β' for 2).
See https://www.w3.org/TR/css-counter-styles-3/#counter-styles for more details.
Getting started #
Getting started is simple:
dependencies:
list_counter: ^1.0.2
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Usage #
void main() {
final counter = Counter('named_counter'); //You can also start a counter at a specific integer value with Counter('name', VALUE);
final listStyle = PredefinedCounterStyle.upperRoman;

counter.increment(); // Adds 1 to the counter
print(listStyle.generateMarkerContent(counter.value));
// Prints "I. "

counter.increment(2021); // Now the counter is at 2022
print(listStyle.generateMarkerContent(conter.value));
// Prints "MMXXII. "

// Optionally, you can just print the result of the algorithm without any suffixes:
print(listStyle.generateCounterContent(counter.value));
// Prints "MMXXII"
}
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Predefined Counter Styles #
A lengthy list of predefined counter styles is included!
Some of the most basic include:

PredefinedCounterStyle.decimal (A simple ordered list)
PredefinedCounterStyle.disc (A simple bulleted/unordered list)
PredefinedCounterStyle.circle (A bulleted list with open circles)
PredefinedCounterStyle.square (A bulleted list with square bullets)
PredefinedCounterStyle.lowerAlpha (a, b, c, ..., z, aa, ab)

As well as dozens of language-specific number/alphabet systems, such as:

PredefinedCounterStyle.cjkDecimal (〇一二三四五六七八九 ...)
PredefinedCounterStyle.cambodian (០ ១ ២ ៣ ៤ ៥ ៦ ៧ ៨ ៩ ...)
PredefinedCounterStyle.katakana (アイウエオカキク ...)
PredefinedCounterStyle.koreanHangulFormal (일천일백일십일, etc.)
PredefinedCounterStyle.simpChineseFormal (壹仟壹佰壹拾壹, etc.)

See https://www.w3.org/TR/css-counter-styles-3/#predefined-counters for the full list.
Custom Counter Styles #
Or, you can define your own style:
// Sample additive style taken from https://www.w3.org/TR/css-counter-styles-3/#additive-system
final diceStyle = CounterStyle.define(
name: 'dice-style',
system: System.additive,
additiveSymbols: {6: '⚅', 5: '⚄', 4: '⚃', 3: '⚂', 2: '⚁', 1: '⚀'},
suffix: " ",
);
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diceStyle will then produce lists that look like:
⚀ One
⚁ Two
⚂ Three
...
⚅⚄ Eleven
⚅⚅ Twelve
⚅⚅⚀ Thirteen
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Using the CounterStyleRegistry #
If wanted, you can also dynamically manage a library of CounterStyles using
the static CounterStyleRegistry. It is automatically filled with all the
predefined styles.
Here's how it can be used:
void main() {
// Optionally register your own styles:
CounterStyleRegistry.register(myCustomStyle);
// You can also overwrite any of the predefined styles:
CounterStyleRegistry.register(customDisc);
// customDisc Has name "disc" to overwrite the default style in the registry

// Elsewhere...

// Lookup your custom style by its name to use it:
CounterStyleRegistry.lookup('my-custom-style');
// or lookup a predefined style:
CounterStyleRegistry.lookup('ethiopic-numeric');

// Optionally...
CounterStyleRegistry.remove('my-custom-style');
}
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