From a16f8d760a3c454717fd92b1b373d034cb4ebea7 Mon Sep 17 00:00:00 2001
From: Mingun <Alexander_Sergey@mail.ru>
Date: Mon, 26 Jul 2021 00:00:06 +0500
Subject: [PATCH] source-map: Add mapping for the rule names to the names of
 the parse functions

---
 lib/compiler/passes/generate-js.js | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 48e6bd1a..a54340ed 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -127,7 +127,11 @@ function wrapInSourceNode(prefix, chunk, location, suffix, name) {
 // Generates parser JavaScript code.
 function generateJS(ast, options) {
   // These only indent non-empty lines to avoid trailing whitespace.
-  function indent2(code) { return code.replace(/^(.+)$/gm, "  $1"); }
+  function indent2(code) {
+    return code instanceof SourceNode
+      ? code
+      : code.replace(/^(.+)$/gm, "  $1");
+  }
 
   function l(i) { return "peg$c" + i; } // |literals[i]| of the abstract machine
   function r(i) { return "peg$r" + i; } // |classes[i]| of the abstract machine
@@ -578,7 +582,13 @@ function generateJS(ast, options) {
 
     const code = compile(rule.bytecode);
 
-    parts.push("function " + name(rule.name) + "() {");
+    parts.push(wrapInSourceNode(
+      "  function ",
+      name(rule.name),
+      rule.nameLocation,
+      "() {\n",
+      rule.name
+    ));
 
     if (options.trace) {
       parts.push("  var startPos = peg$currPos;");