feat: restore gateway HMR and add WRN formatting

2026-07-13 14:54:03 +05:30
parent 3b46c69601
commit cff420a29e
71 changed files with 727 additions and 119 deletions
@@ -0,0 +1,117 @@
+"use strict";
+
+const VOID_ELEMENTS = new Set([
+  "area",
+  "base",
+  "br",
+  "col",
+  "embed",
+  "hr",
+  "img",
+  "input",
+  "link",
+  "meta",
+  "param",
+  "source",
+  "track",
+  "wbr",
+]);
+
+/** Count structural curly braces while ignoring quoted strings and line comments. */
+function curlyDelta(line, state) {
+  let delta = 0;
+  let quote = null;
+  let escaped = false;
+
+  for (let index = 0; index < line.length; index++) {
+    const char = line[index];
+    const next = line[index + 1];
+
+    if (state.blockComment) {
+      if (char === "*" && next === "/") {
+        state.blockComment = false;
+        index++;
+      }
+      continue;
+    }
+    if (state.template) {
+      if (!escaped && char === "`") state.template = false;
+      escaped = !escaped && char === "\\";
+      if (char !== "\\") escaped = false;
+      continue;
+    }
+    if (quote) {
+      if (!escaped && char === quote) quote = null;
+      escaped = !escaped && char === "\\";
+      if (char !== "\\") escaped = false;
+      continue;
+    }
+    if (char === "/" && next === "*") {
+      state.blockComment = true;
+      index++;
+    } else if (char === "/" && next === "/") {
+      break;
+    } else if (char === "`") {
+      state.template = true;
+    } else if (char === '"' || char === "'") {
+      quote = char;
+    } else if (char === "{") {
+      delta++;
+    } else if (char === "}") {
+      delta--;
+    }
+  }
+  return delta;
+}
+
+/** Return the net nesting introduced by HTML-like tags on this line. */
+function htmlDelta(line) {
+  let delta = 0;
+  const tags = line.matchAll(/<\s*(\/?)\s*([A-Za-z][\w:-]*)\b[^>]*>/g);
+  for (const match of tags) {
+    const full = match[0];
+    const closing = match[1] === "/";
+    const name = match[2].toLowerCase();
+    if (closing) delta--;
+    else if (!VOID_ELEMENTS.has(name) && !/\/\s*>$/.test(full)) delta++;
+  }
+  return delta;
+}
+
+function leadingClosers(line) {
+  let count = /^\s*}/.test(line) ? 1 : 0;
+  const tags = line.match(/^\s*((?:<\/\s*[A-Za-z][\w:-]*\s*>\s*)+)/);
+  if (tags) count += [...tags[1].matchAll(/<\//g)].length;
+  return count;
+}
+
+/**
+ * Format WRN source conservatively: normalize structural indentation and
+ * trailing whitespace without rewriting expressions, HTML, CSS, or JS.
+ */
+function formatWrn(text, options = {}) {
+  const tabSize = Math.max(1, Number(options.tabSize) || 2);
+  const unit = options.insertSpaces === false ? "\t" : " ".repeat(tabSize);
+  const hadFinalNewline = /\r?\n$/.test(text);
+  const lines = text.replace(/\r\n/g, "\n").split("\n");
+  if (hadFinalNewline) lines.pop();
+
+  let depth = 0;
+  const state = { blockComment: false, template: false };
+  const formatted = lines.map((original) => {
+    const line = original.trimEnd();
+    if (!line.trim()) return "";
+
+    // Preserve multiline template-string content because its whitespace can be data.
+    const wasTemplate = state.template;
+    const trimmed = line.trimStart();
+    const indent = Math.max(0, depth - leadingClosers(trimmed));
+    const output = wasTemplate ? line : unit.repeat(indent) + trimmed;
+    depth = Math.max(0, depth + curlyDelta(trimmed, state) + htmlDelta(trimmed));
+    return output;
+  });
+
+  return formatted.join("\n") + (hadFinalNewline ? "\n" : "");
+}
+
+module.exports = { formatWrn };