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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;
}
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