Method iterSubstrings

src/SpannedString.ts:196–238

()

    }

    *iterSubstrings(): IterableIterator<[string, T[]]> {
        const activeSpansById = new Map<number, Span<T>>();

        function getActiveAttributes() {
            return (
                Array.from(activeSpansById.values())
                    // Attributes should be returned in the order they were
                    // applied.
                    .sort((a, b) => a.id - b.id)
                    .map((span) => span.attribute)
            );
        }

        let lastIndex = 0;
        for (let spanIndex = 0; spanIndex <= this._string.length; spanIndex++) {
            const spans = this._spanMarkers[spanIndex];

            if (spans === undefined || spans.length === 0) {
                continue;
            }

            if (spanIndex > lastIndex) {
                yield [
                    this._string.slice(lastIndex, spanIndex),
                    getActiveAttributes(),
                ];
            }

            for (const span of spans) {
                if (span.isStart) {
                    activeSpansById.set(span.id, span);
                } else {
                    activeSpansById.delete(span.id);
                }
            }

            lastIndex = spanIndex;
        }

        if (lastIndex < this._string.length) {
            yield [this._string.slice(lastIndex), getActiveAttributes()];
        }
    }
}