Function getNumbersFromString

src/utils/color.ts:235–282

(input: string, range: number[], units: {[unit: string]: number})

const C_PERCENT = '%'.charCodeAt(0);

function getNumbersFromString(input: string, range: number[], units: {[unit: string]: number}) {
    const numbers: number[] = [];
    const searchStart = input.indexOf('(') + 1;
    const searchEnd = input.length - 1;
    let numStart = -1;
    let unitStart = -1;

    const push = (matchEnd: number) => {
        const numEnd = unitStart > -1 ? unitStart : matchEnd;
        const $num = input.slice(numStart, numEnd);
        let n = parseFloat($num);
        const r = range[numbers.length];
        if (unitStart > -1) {
            const unit = input.slice(unitStart, matchEnd);
            const u = units[unit];
            if (u != null) {
                n *= r / u;
            }
        }
        if (r > 1) {
            n = Math.round(n);
        }
        numbers.push(n);
        numStart = -1;
        unitStart = -1;
    };

    for (let i = searchStart; i < searchEnd; i++) {
        const c = input.charCodeAt(i);
        const isNumChar = (c >= C_0 && c <= C_9) || c === C_DOT || c === C_PLUS || c === C_MINUS || c === C_e;
        const isDelimiter = c === C_SPACE || c === C_COMMA || c === C_SLASH;
        if (isNumChar) {
            if (numStart === -1) {
                numStart = i;
            }
        } else if (numStart > -1) {
            if (isDelimiter) {
                push(i);
            } else if (unitStart === -1) {
                unitStart = i;
            }
        }
    }
    if (numStart > -1) {
        push(searchEnd);
    }
    return numbers;
}

const rgbRange = [255, 255, 255, 1];
const rgbUnits = {'%': 100};