All files / roosterjs-content-model-plugins/lib/autoFormat/list getNumberingListStyle.ts

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import { getIndex } from './getIndex';
import { NumberingListType } from 'roosterjs-content-model-dom';
 
const enum NumberingTypes {
    Decimal = 1,
    LowerAlpha = 2,
    UpperAlpha = 3,
    LowerRoman = 4,
    UpperRoman = 5,
}
 
const enum Character {
    Dot = 1,
    Dash = 2,
    Parenthesis = 3,
    DoubleParenthesis = 4,
}
 
const characters: Record<string, number> = {
    '.': Character.Dot,
    '-': Character.Dash,
    ')': Character.Parenthesis,
};
 
const lowerRomanTypes = [
    NumberingListType.LowerRoman,
    NumberingListType.LowerRomanDash,
    NumberingListType.LowerRomanDoubleParenthesis,
    NumberingListType.LowerRomanParenthesis,
];
const upperRomanTypes = [
    NumberingListType.UpperRoman,
    NumberingListType.UpperRomanDash,
    NumberingListType.UpperRomanDoubleParenthesis,
    NumberingListType.UpperRomanParenthesis,
];
const numberingTriggers = ['1', 'a', 'A', 'I', 'i'];
const lowerRomanNumbers = ['i', 'v', 'x', 'l', 'c', 'd', 'm'];
const upperRomanNumbers = ['I', 'V', 'X', 'L', 'C', 'D', 'M'];
 
const identifyNumberingType = (text: string, previousListStyle?: number) => {
    if (!isNaN(parseInt(text))) {
        return NumberingTypes.Decimal;
    } else if (/[a-z]+/g.test(text)) {
        if (
            (previousListStyle === NumberingTypes.LowerRoman &&
                lowerRomanTypes.indexOf(previousListStyle) > -1 &&
                lowerRomanNumbers.indexOf(text[0]) > -1) ||
            (!previousListStyle && text === 'i')
        ) {
            return NumberingTypes.LowerRoman;
        } else Eif (
            previousListStyle === NumberingTypes.LowerAlpha ||
            (!previousListStyle && text === 'a')
        ) {
            return NumberingTypes.LowerAlpha;
        }
    } else Eif (/[A-Z]+/g.test(text)) {
        if (
            (previousListStyle == NumberingTypes.UpperRoman &&
                upperRomanTypes.indexOf(previousListStyle) > -1 &&
                upperRomanNumbers.indexOf(text[0]) > -1) ||
            (!previousListStyle && text === 'I')
        ) {
            return NumberingTypes.UpperRoman;
        } else Eif (
            previousListStyle == NumberingTypes.UpperAlpha ||
            (!previousListStyle && text === 'A')
        ) {
            return NumberingTypes.UpperAlpha;
        }
    }
};
 
const numberingListTypes: Record<number, (char: number) => number | undefined> = {
    [NumberingTypes.Decimal]: char => DecimalsTypes[char] || undefined,
    [NumberingTypes.LowerAlpha]: char => LowerAlphaTypes[char] || undefined,
    [NumberingTypes.UpperAlpha]: char => UpperAlphaTypes[char] || undefined,
    [NumberingTypes.LowerRoman]: char => LowerRomanTypes[char] || undefined,
    [NumberingTypes.UpperRoman]: char => UpperRomanTypes[char] || undefined,
};
 
const UpperRomanTypes: Record<number, number> = {
    [Character.Dot]: NumberingListType.UpperRoman,
    [Character.Dash]: NumberingListType.UpperRomanDash,
    [Character.Parenthesis]: NumberingListType.UpperRomanParenthesis,
    [Character.DoubleParenthesis]: NumberingListType.UpperRomanDoubleParenthesis,
};
 
const LowerRomanTypes: Record<number, number> = {
    [Character.Dot]: NumberingListType.LowerRoman,
    [Character.Dash]: NumberingListType.LowerRomanDash,
    [Character.Parenthesis]: NumberingListType.LowerRomanParenthesis,
    [Character.DoubleParenthesis]: NumberingListType.LowerRomanDoubleParenthesis,
};
 
const UpperAlphaTypes: Record<number, number> = {
    [Character.Dot]: NumberingListType.UpperAlpha,
    [Character.Dash]: NumberingListType.UpperAlphaDash,
    [Character.Parenthesis]: NumberingListType.UpperAlphaParenthesis,
    [Character.DoubleParenthesis]: NumberingListType.UpperAlphaDoubleParenthesis,
};
 
const LowerAlphaTypes: Record<number, number> = {
    [Character.Dot]: NumberingListType.LowerAlpha,
    [Character.Dash]: NumberingListType.LowerAlphaDash,
    [Character.Parenthesis]: NumberingListType.LowerAlphaParenthesis,
    [Character.DoubleParenthesis]: NumberingListType.LowerAlphaDoubleParenthesis,
};
 
const DecimalsTypes: Record<number, number> = {
    [Character.Dot]: NumberingListType.Decimal,
    [Character.Dash]: NumberingListType.DecimalDash,
    [Character.Parenthesis]: NumberingListType.DecimalParenthesis,
    [Character.DoubleParenthesis]: NumberingListType.DecimalDoubleParenthesis,
};
 
const identifyNumberingListType = (
    numbering: string,
    isDoubleParenthesis: boolean,
    previousListStyle?: number
): number | undefined => {
    const separatorCharacter = isDoubleParenthesis
        ? Character.DoubleParenthesis
        : characters[numbering[numbering.length - 1]];
    // if separator is not valid, no need to check if the number is valid.
    if (separatorCharacter) {
        const number = isDoubleParenthesis ? numbering.slice(1, -1) : numbering.slice(0, -1);
        const numberingType = identifyNumberingType(number, previousListStyle);
        return numberingType ? numberingListTypes[numberingType](separatorCharacter) : undefined;
    }
    return undefined;
};
 
/**
 * @internal
 */
export function getNumberingListStyle(
    textBeforeCursor: string,
    previousListIndex?: number,
    previousListStyle?: number
): number | undefined {
    const trigger = textBeforeCursor.trim();
    const isDoubleParenthesis = trigger[0] === '(' && trigger[trigger.length - 1] === ')';
    //Only the staring items ['1', 'a', 'A', 'I', 'i'] must trigger a new list. All the other triggers is used to keep the list chain.
    //The index is always the characters before the last character
    const listIndex = isDoubleParenthesis ? trigger.slice(1, -1) : trigger.slice(0, -1);
    const index = getIndex(listIndex);
    const isContinuosList = numberingTriggers.indexOf(listIndex) < 0;
 
    if (
        !index ||
        index < 1 ||
        (!previousListIndex && isContinuosList) ||
        (previousListIndex && isContinuosList && !canAppendList(index, previousListIndex))
    ) {
        return undefined;
    }
 
    const numberingType = isValidNumbering(listIndex)
        ? identifyNumberingListType(
              trigger,
              isDoubleParenthesis,
              isContinuosList ? previousListStyle : undefined
          )
        : undefined;
    return numberingType;
}
 
/**
 * Check if index has only numbers or only letters to avoid sequence of character such 1:1. trigger a list.
 * @param index
 * @returns
 */
function isValidNumbering(index: string) {
    return Number(index) || /^[A-Za-z\s]*$/.test(index);
}
 
function canAppendList(index?: number, previousListIndex?: number) {
    return previousListIndex && index && previousListIndex + 1 === index;
}