astro/dist/runtime/server/render/queue/renderer.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { markHTMLString, escapeHTML } from "../../escape.js";
import { chunkToString } from "../common.js";
async function renderQueue(queue, destination) {
  const result = queue.result;
  const pool = queue.pool;
  const cache = queue.htmlStringCache;
  let batchBuffer = "";
  let i = 0;
  while (i < queue.nodes.length) {
    const node = queue.nodes[i];
    try {
      if (canBatch(node)) {
        const batchStart = i;
        while (i < queue.nodes.length && canBatch(queue.nodes[i])) {
          batchBuffer += renderNodeToString(queue.nodes[i]);
          i = i + 1;
        }
        if (batchBuffer) {
          const htmlString = cache ? cache.getOrCreate(batchBuffer) : markHTMLString(batchBuffer);
          destination.write(htmlString);
          batchBuffer = "";
        }
        if (pool) {
          for (let j = batchStart; j < i; j++) {
            pool.release(queue.nodes[j]);
          }
        }
      } else {
        await renderNode(node, destination, result);
        if (pool) {
          pool.release(node);
        }
        i = i + 1;
      }
    } catch (error) {
      throw error;
    }
  }
  if (batchBuffer) {
    const htmlString = cache ? cache.getOrCreate(batchBuffer) : markHTMLString(batchBuffer);
    destination.write(htmlString);
  }
}
function canBatch(node) {
  return node.type === "text" || node.type === "html-string";
}
function renderNodeToString(node) {
  switch (node.type) {
    case "text":
      return node.content ? escapeHTML(node.content) : "";
    case "html-string":
      return node.html || "";
    case "component":
    case "instruction": {
      return "";
    }
  }
}
async function renderNode(node, destination, result) {
  const cache = result._experimentalQueuedRendering?.htmlStringCache;
  switch (node.type) {
    case "text": {
      if (node.content) {
        const escaped = escapeHTML(node.content);
        const htmlString = cache ? cache.getOrCreate(escaped) : markHTMLString(escaped);
        destination.write(htmlString);
      }
      break;
    }
    case "html-string": {
      if (node.html) {
        const htmlString = cache ? cache.getOrCreate(node.html) : markHTMLString(node.html);
        destination.write(htmlString);
      }
      break;
    }
    case "instruction": {
      if (node.instruction) {
        destination.write(node.instruction);
      }
      break;
    }
    case "component": {
      if (node.instance) {
        let componentHtml = "";
        const componentDestination = {
          write(chunk) {
            if (chunk instanceof Response) return;
            componentHtml += chunkToString(result, chunk);
          }
        };
        await node.instance.render(componentDestination);
        if (componentHtml) {
          destination.write(componentHtml);
        }
      }
      break;
    }
  }
}
export {
  renderQueue
};