@scalar/code-highlight/dist/rehype-alert/rehype-alert.js

Central methods and themes for code highlighting in Scalar projects

import { visit } from "unist-util-visit";
const ALERT_TYPES = ["note", "tip", "important", "warning", "caution", "success"];
function isWhitespace(node) {
  return node.type === "text" && typeof node.value === "string" && /^\s*$/.test(node.value);
}
function rehypeAlert() {
  return (tree) => {
    visit(tree, "element", (node, index, parent) => {
      if (node.tagName !== "blockquote" || typeof index !== "number" || !parent || parent.type !== "root") {
        return;
      }
      const headIndex = node.children.findIndex((child) => !isWhitespace(child));
      if (headIndex === -1) {
        return;
      }
      const head = node.children[headIndex];
      if (!head || head.type !== "element" || head.tagName !== "p") {
        return;
      }
      const text = head.children[0];
      if (!text || text.type !== "text" || !text.value.startsWith("[!")) {
        return;
      }
      const end = text.value.indexOf("]");
      if (end === -1) {
        return;
      }
      const alertType = text.value.slice(2, end).toLowerCase();
      if (!ALERT_TYPES.includes(alertType)) {
        return;
      }
      if (end + 1 === text.value.length) {
        const next = head.children[1];
        if (next) {
          if (next.type !== "element" || next.tagName !== "br") {
            return;
          }
          if (!head.children[2]) {
            return;
          }
          head.children = head.children.slice(2);
          const node2 = head.children[0];
          if (node2 && node2.type === "text" && node2.value.charAt(0) === "\n") {
            node2.value = node2.value.slice(1);
          }
        } else {
          const skipped = headIndex + 1 < node.children.length && isWhitespace(node.children[headIndex + 1]);
          const nextIndex = skipped ? headIndex + 2 : headIndex + 1;
          if (nextIndex >= node.children.length || node.children[nextIndex]?.type !== "element") {
            return;
          }
          node.children = node.children.slice(nextIndex);
        }
      } else if (text.value.charAt(end + 1) === "\n" && // Check if the next character is a newline or a non-whitespace character
      (end + 2 === text.value.length || !/^\s*$/.test(text.value.slice(end + 2)))) {
        text.value = text.value.slice(end + 2);
      } else {
        text.value = text.value.replace(/^\s*\[!.*?\]\s*/, "");
      }
      const contentChildren = [];
      for (let i = headIndex; i < node.children.length; i++) {
        const child = node.children[i];
        if (child?.type === "element" && child.tagName === "p" && child.children) {
          contentChildren.push(...child.children);
        } else {
          contentChildren.push(child);
        }
      }
      parent.children[index] = {
        type: "element",
        tagName: "div",
        properties: { className: ["markdown-alert", `markdown-alert-${alertType}`] },
        children: [
          {
            type: "element",
            tagName: "div",
            properties: { className: ["markdown-alert-icon"] },
            children: []
          },
          {
            type: "element",
            tagName: "div",
            properties: { className: ["markdown-alert-content"] },
            children: [{ type: "text", value: " " }, ...contentChildren]
          }
        ]
      };
    });
  };
}
export {
  rehypeAlert
};
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