121 lines
3.1 KiB
TypeScript
121 lines
3.1 KiB
TypeScript
"use client";
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import { useCallback, useEffect, useMemo, useRef, useState } from "react";
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import { Typography } from "poyraz-ui/atoms";
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type TocHeading = {
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id: string;
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text: string;
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level: 2 | 3;
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};
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function parseHeadings(markdown: string): TocHeading[] {
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const headings: TocHeading[] = [];
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const lines = markdown.split("\n");
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for (const line of lines) {
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const match = /^(#{2,3})\s+(.+)$/.exec(line.trim());
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if (!match) continue;
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const level = match[1].length as 2 | 3;
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const raw = match[2].replace(/\*\*/g, "").replace(/\*/g, "").trim();
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const id = raw
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.toLowerCase()
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.replace(/[^a-zçğıöşü0-9\s-]/g, "")
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.replace(/\s+/g, "-")
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.replace(/-+/g, "-")
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.replace(/^-|-$/g, "");
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if (id && raw) {
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headings.push({ id, text: raw, level });
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}
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}
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return headings;
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}
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type BlogTocProps = {
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markdown: string;
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onNavigate?: () => void;
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};
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export function BlogToc({ markdown, onNavigate }: BlogTocProps) {
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const headings = useMemo(() => parseHeadings(markdown), [markdown]);
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const [activeId, setActiveId] = useState("");
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const rafRef = useRef(0);
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const handleClick = useCallback((id: string) => {
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const target = document.getElementById(id);
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if (!target) return;
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target.scrollIntoView({ behavior: "smooth", block: "start" });
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setActiveId(id);
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onNavigate?.();
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}, [onNavigate]);
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useEffect(() => {
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if (headings.length === 0) return;
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const OFFSET = 120;
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const updateActive = () => {
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let current = "";
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for (const heading of headings) {
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const el = document.getElementById(heading.id);
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if (!el) continue;
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const top = el.getBoundingClientRect().top;
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if (top <= OFFSET) {
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current = heading.id;
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}
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}
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if (current) {
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setActiveId(current);
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}
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};
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const onScroll = () => {
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cancelAnimationFrame(rafRef.current);
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rafRef.current = requestAnimationFrame(updateActive);
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};
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window.addEventListener("scroll", onScroll, { passive: true });
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const timer = setTimeout(updateActive, 300);
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return () => {
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window.removeEventListener("scroll", onScroll);
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cancelAnimationFrame(rafRef.current);
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clearTimeout(timer);
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};
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}, [headings]);
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if (headings.length < 2) return null;
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return (
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<nav aria-label="İçindekiler" className="space-y-1">
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<Typography variant="small" className="mb-2 font-semibold text-foreground">
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İçindekiler
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</Typography>
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{headings.map((heading, index) => (
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<button
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key={`${heading.id}-${index}`}
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type="button"
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onClick={() => handleClick(heading.id)}
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className={[
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"block w-full cursor-pointer truncate border-l-2 text-left text-xs leading-relaxed transition-colors",
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heading.level === 3 ? "pl-5" : "pl-3",
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activeId === heading.id
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? "border-red-600 text-red-600"
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: "border-transparent text-muted-foreground hover:text-foreground",
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].join(" ")}
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>
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{heading.text}
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</button>
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))}
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</nav>
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);
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}
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