From a024bea6b4498c1e5dd8c1614932ef3d901c8804 Mon Sep 17 00:00:00 2001
From: Paul Bakker <p-bakker@users.noreply.github.com>
Date: Thu, 9 Nov 2023 17:20:54 +0100
Subject: [PATCH] Support hashbang (#1417)

Support hashbang syntax at the start of a script
---
 src/org/mozilla/javascript/TokenStream.java              | 9 +++++++++
 .../org/mozilla/javascript/tests/Test262SuiteTest.java   | 1 -
 testsrc/test262.properties                               | 5 +++--
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/org/mozilla/javascript/TokenStream.java b/src/org/mozilla/javascript/TokenStream.java
index 15ad0ae5a0..2e5292d5ba 100644
--- a/src/org/mozilla/javascript/TokenStream.java
+++ b/src/org/mozilla/javascript/TokenStream.java
@@ -1117,6 +1117,15 @@ final int getToken() throws IOException {
                 return Token.STRING;
             }
 
+            if (c == '#'
+                    && cursor == 1
+                    && peekChar() == '!'
+                    && !this.parser.calledByCompileFunction) {
+                // #! hashbang: only on the first line of a Script, no leading whitespace
+                skipLine();
+                return Token.COMMENT;
+            }
+
             switch (c) {
                 case ';':
                     return Token.SEMI;
diff --git a/testsrc/org/mozilla/javascript/tests/Test262SuiteTest.java b/testsrc/org/mozilla/javascript/tests/Test262SuiteTest.java
index 6c6e9e4be7..61c2e6c8eb 100644
--- a/testsrc/org/mozilla/javascript/tests/Test262SuiteTest.java
+++ b/testsrc/org/mozilla/javascript/tests/Test262SuiteTest.java
@@ -111,7 +111,6 @@ public class Test262SuiteTest {
                             "String.prototype.matchAll",
                             "Symbol.matchAll",
                             "tail-call-optimization",
-                            "hashbang",
                             "u180e"));
 
     static {
diff --git a/testsrc/test262.properties b/testsrc/test262.properties
index b381849907..fccf6b8a1e 100644
--- a/testsrc/test262.properties
+++ b/testsrc/test262.properties
@@ -2762,8 +2762,9 @@ language/block-scope 68/145 (46.9%)
     syntax/redeclaration/var-redeclaration-attempt-after-function.js
     syntax/redeclaration/var-redeclaration-attempt-after-generator.js
 
-language/comments 36/52 (69.23%)
-    hashbang 29/29 (100.0%)
+language/comments 9/52 (17.31%)
+    hashbang/function-constructor.js
+    hashbang/module.js {unsupported: [module]}
     mongolian-vowel-separator-multi.js {unsupported: [u180e]}
     mongolian-vowel-separator-single.js {unsupported: [u180e]}
     mongolian-vowel-separator-single-eval.js {unsupported: [u180e]}