Function highlightCode

packages/web/src/lib/codeHighlight.ts:38–127

(
    languageName: string,
    input: string,
    highlighter: Highlighter,
    highlightRanges: { from: number; to: number }[] = [],
    callback: (
        text: string,
        style: string | null,
        from: number,
        to: number,
    ) => Output,
)

};

export async function highlightCode<Output>(
    languageName: string,
    input: string,
    highlighter: Highlighter,
    highlightRanges: { from: number; to: number }[] = [],
    callback: (
        text: string,
        style: string | null,
        from: number,
        to: number,
    ) => Output,
): Promise<Output[]> {
    const parser = await getCodeParserByLanguageName(languageName);

    const convertRangeToHighlightedSubranges = (
        from: number,
        to: number,
        classes: string | null,
        cb: (from: number, to: number, classes: string | null) => void,
    ) => {
        type HighlightRange = {
            from: number;
            to: number;
            isHighlighted: boolean;
        };

        const highlightClasses = classes
            ? `${classes} searchMatch-selected`
            : 'searchMatch-selected';

        let currentRange: HighlightRange | null = null;
        for (let i = from; i < to; i++) {
            const isHighlighted = isIndexHighlighted(i, highlightRanges);

            if (currentRange) {
                if (currentRange.isHighlighted === isHighlighted) {
                    currentRange.to = i + 1;
                } else {
                    cb(
                        currentRange.from,
                        currentRange.to,
                        currentRange.isHighlighted ? highlightClasses : classes,
                    );

                    currentRange = { from: i, to: i + 1, isHighlighted };
                }
            } else {
                currentRange = { from: i, to: i + 1, isHighlighted };
            }
        }

        if (currentRange) {
            cb(
                currentRange.from,
                currentRange.to,
                currentRange.isHighlighted ? highlightClasses : classes,
            );
        }