From db69aab106ed01d78c788f5961daed1888e91a24 Mon Sep 17 00:00:00 2001
From: Matei6942 <mateigavra0@gmail.com>
Date: Sun, 2 Aug 2026 10:52:05 +0300
Subject: [PATCH 1/4] fix(syntax): avoid repeated log level scans

---
 assets/syntaxes/02_Extra/log.sublime-syntax | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/assets/syntaxes/02_Extra/log.sublime-syntax b/assets/syntaxes/02_Extra/log.sublime-syntax
index 0ce01f10..acd14216 100644
--- a/assets/syntaxes/02_Extra/log.sublime-syntax
+++ b/assets/syntaxes/02_Extra/log.sublime-syntax
@@ -38,19 +38,20 @@ contexts:
       scope: markup.underline.link.scheme.log
       push: url-host
   log_level_lines:
-    - match: (?=.*{{error}})
+    # Prevent retrying each lookahead at every position.
+    - match: \G(?=.*{{error}})
       push:
         - error_line_meta
         - main_pop_at_eol
-    - match: (?=.*{{warning}})
+    - match: \G(?=.*{{warning}})
       push:
         - warning_line_meta
         - main_pop_at_eol
-    - match: (?=.*{{info}})
+    - match: \G(?=.*{{info}})
       push:
         - info_line_meta
         - main_pop_at_eol
-    - match: (?=.*{{debug}})
+    - match: \G(?=.*{{debug}})
       push:
         - debug_line_meta
         - main_pop_at_eol

From 531d54b110d9b2311ab852e728ad1448d808ae03 Mon Sep 17 00:00:00 2001
From: Matei6942 <mateigavra0@gmail.com>
Date: Sun, 2 Aug 2026 10:52:39 +0300
Subject: [PATCH 2/4] docs: add changelog entry for #3876

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e0abc18..a2819429 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 - Syntax highlighting for Python files using uv as script runner in shebang #3689 (@janlarres)
 
 ## Bugfixes
+- Avoid repeated scans of long lines in Log syntax highlighting, see #3876 (@Matei02355)
 - Fix `--list-languages` respecting `--paging=never`, see #3828 (@cyphercodes)
 - Fix `--sanitize` passing through the bidi control characters U+200E, U+200F and U+061C, see #3862 (@lenamonj)
 - `--strip-ansi`: also strip 8-bit C1 introducers (U+0090, U+0098, U+009B, U+009D, U+009E, U+009F) and DCS/SOS/PM/APC sequence bodies, which previously passed through. See #3729 (@curious-rabbit)

From 3ca4a01be6bef5ba7c32c4cacc285e60bf66426e Mon Sep 17 00:00:00 2001
From: Matei6942 <mateigavra0@gmail.com>
Date: Mon, 10 Aug 2026 20:00:44 +0300
Subject: [PATCH 3/4] fix(syntax): use start-of-line anchor for log levels

---
 assets/syntaxes/02_Extra/log.sublime-syntax | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/assets/syntaxes/02_Extra/log.sublime-syntax b/assets/syntaxes/02_Extra/log.sublime-syntax
index acd14216..5a4a0e06 100644
--- a/assets/syntaxes/02_Extra/log.sublime-syntax
+++ b/assets/syntaxes/02_Extra/log.sublime-syntax
@@ -39,19 +39,19 @@ contexts:
       push: url-host
   log_level_lines:
     # Prevent retrying each lookahead at every position.
-    - match: \G(?=.*{{error}})
+    - match: ^(?=.*{{error}})
       push:
         - error_line_meta
         - main_pop_at_eol
-    - match: \G(?=.*{{warning}})
+    - match: ^(?=.*{{warning}})
       push:
         - warning_line_meta
         - main_pop_at_eol
-    - match: \G(?=.*{{info}})
+    - match: ^(?=.*{{info}})
       push:
         - info_line_meta
         - main_pop_at_eol
-    - match: \G(?=.*{{debug}})
+    - match: ^(?=.*{{debug}})
       push:
         - debug_line_meta
         - main_pop_at_eol

From cecbb80093a42690f8f432c37b5c279af2214615 Mon Sep 17 00:00:00 2001
From: Matei6942 <mateigavra0@gmail.com>
Date: Mon, 10 Aug 2026 20:56:35 +0300
Subject: [PATCH 4/4] fix(syntax): preserve log-level scopes in Syslog

---
 assets/syntaxes/02_Extra/log.sublime-syntax    | 18 ++++++++++++++++++
 assets/syntaxes/02_Extra/syslog.sublime-syntax | 12 +++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/assets/syntaxes/02_Extra/log.sublime-syntax b/assets/syntaxes/02_Extra/log.sublime-syntax
index 5a4a0e06..329da39d 100644
--- a/assets/syntaxes/02_Extra/log.sublime-syntax
+++ b/assets/syntaxes/02_Extra/log.sublime-syntax
@@ -55,6 +55,24 @@ contexts:
       push:
         - debug_line_meta
         - main_pop_at_eol
+  # For syntaxes that embed Log after consuming a prefix. Call this context once.
+  log_level_lines_at_current_position:
+    - match: (?=.*{{error}})
+      set:
+        - error_line_meta
+        - main_pop_at_eol
+    - match: (?=.*{{warning}})
+      set:
+        - warning_line_meta
+        - main_pop_at_eol
+    - match: (?=.*{{info}})
+      set:
+        - info_line_meta
+        - main_pop_at_eol
+    - match: (?=.*{{debug}})
+      set:
+        - debug_line_meta
+        - main_pop_at_eol
   log_levels:
     - match: '{{error}}'
       scope: markup.error.log
diff --git a/assets/syntaxes/02_Extra/syslog.sublime-syntax b/assets/syntaxes/02_Extra/syslog.sublime-syntax
index 01ed58db..7cc9580b 100644
--- a/assets/syntaxes/02_Extra/syslog.sublime-syntax
+++ b/assets/syntaxes/02_Extra/syslog.sublime-syntax
@@ -50,6 +50,17 @@ contexts:
     - match: (?=\])
       pop: true
   text:
+    - include: text_special
+    - match: ''
+      set: classify_log_text
+  classify_log_text:
+    - include: scope:text.log#log_level_lines_at_current_position
+    - match: ''
+      set: text_body
+  text_body:
+    - include: text_special
+    - include: scope:text.log
+  text_special:
     - match: $
       pop: true
     - match: '<\w+>'
@@ -62,4 +73,3 @@ contexts:
       escape: \)$
       escape_captures:
         0: punctuation.section.block.end.syslog
-    - include: scope:text.log