runtime(erlang): Optimize operators and bitstring types
Commit:
https://github.com/vim/vim/commit/c6705b2c3ecbc44f751c961122f08b0a3d8d7b88
Author: Csaba Hoch <[email protected]>
Date: Mon Jun 15 18:59:22 2026 +0000
runtime(erlang): Optimize operators and bitstring types
This commit makes processing the erlangOperator and erlangBitType syntax
items faster.
- erlangOperator changes:
- Vim now parses erlangOperator faster because we define the operators
individually.
- The order of operators in erlangOperator had to be changed to make
the edge cases work the same as before (for example
erlangEqualsBinary).
- erlangBitType changes:
- Vim now parses erlangBitType faster because:
1. Now the long `\%(integer\|float\|...\)` sections are preceded by
"beginning of word" patterns (`\<`).
2. Now we use the old regexp engine (`\%#=1`).
Previously when an Erlang file contained long lines with erlangOperator
or erlangBitType patterns near the end, redrawing these lines was slow,
and typing at the end of the line was also slow.
For example, redrawing a 1787 characters long test line is now roughly
six times faster.
fixes: #5593
closes: #20524
Signed-off-by: Csaba Hoch <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>
diff --git a/runtime/syntax/erlang.vim b/runtime/syntax/erlang.vim
index bbb03d52c..71084ac1d 100644
--- a/runtime/syntax/erlang.vim
+++ b/runtime/syntax/erlang.vim
@@ -3,7 +3,7 @@
" Maintainer: Csaba Hoch <[email protected]>
" Contributor: Adam Rutkowski <[email protected]>
" Johannes Christ <[email protected]>
-" Last Update: 2025-Nov-12
+" Last Update: 2026-Jun-14
" License: Vim license
" URL: https://github.com/vim-erlang/vim-erlang-runtime
@@ -178,8 +178,38 @@ syn match erlangQuotedAtomModifier
'\\%(\o\{1,3}\|x\x\x\|x{\x\+}\|\^.\|.\)' con
syn match erlangModifier
'\$\%([^\]\|\\%(\o\{1,3}\|x\x\x\|x{\x\+}\|\^.\|.\)\)'
" Operators, separators
-syn match erlangOperator
'==\|=:=\|/=\|=/=\|<\|=<\|>\|>=\|=>\|:=\|?=\|++\|--\|=\|!\|<-\|+\|-\|\*\|\/'
+syn match erlangOperator '='
+syn match erlangOperator '+'
+syn match erlangOperator '-'
+syn match erlangOperator '*'
+syn match erlangOperator '/'
+syn match erlangOperator '<'
+syn match erlangOperator '>'
+syn match erlangOperator '!'
+syn match erlangOperator '=<'
+syn match erlangOperator '>='
+syn match erlangOperator '=>'
+syn match erlangOperator '=='
+syn match erlangOperator '=:='
+syn match erlangOperator '/='
+syn match erlangOperator '=/='
+syn match erlangOperator ':='
+syn match erlangOperator '?='
+syn match erlangOperator '++'
+syn match erlangOperator '--'
+syn match erlangOperator '<-'
+
+" erlangEqualsBinary makes the syntax reflect how Erlang parses the following:
+"
+" A=<<<"binary">>
+" Valid, same as: A =< <<"binary">>
+" A==<<"binary">>
+" Valid, same as: A == <<"binary">>
+" A=<<"binary">>
+" Invalid, parsed as: A =< <"binary">>. This is invalid because there are no
+" "<<" before the binary, only "<".
syn match erlangEqualsBinary '=<<\%(<\)\@!'
+
syn keyword erlangOperator div rem or xor bor bxor bsl bsr and band not bnot
andalso orelse
syn match erlangBracket '{\|}\|\[\|]\||\|||'
syn match erlangPipe '|'
@@ -207,7 +237,7 @@ syn region erlangQuotedRecord start=/#\s*'/ end=/'/
contains=erlangQuoted
syn match erlangShebang '^#!.*'
" Bitstrings
-syn match erlangBitType '\%(\/\%(\s\|
\|%.*
\)*\)\@<=\%(integer\|float\|binary\|bytes\|bitstring\|bits\|binary\|utf8\|utf16\|utf32\|signed\|unsigned\|big\|little\|native\|unit\)\%(\%(\s\|
\|%.*
\)*-\%(\s\|
\|%.*
\)*\%(integer\|float\|binary\|bytes\|bitstring\|bits\|binary\|utf8\|utf16\|utf32\|signed\|unsigned\|big\|little\|native\|unit\)\)*'
contains=erlangComment
+syn match erlangBitType '\%#=1\%(\/\%(\s\|
\|%.*
\)*\)\@<=\<\%(integer\|float\|binary\|bytes\|bitstring\|bits\|binary\|utf8\|utf16\|utf32\|signed\|unsigned\|big\|little\|native\|unit\)\%(\%(\s\|
\|%.*
\)*-\%(\s\|
\|%.*
\)*\<\%(integer\|float\|binary\|bytes\|bitstring\|bits\|binary\|utf8\|utf16\|utf32\|signed\|unsigned\|big\|little\|native\|unit\)\)*'
contains=erlangComment
" Constants and Directives
syn match erlangUnknownAttribute '^\s*-\%(\s\|
\|%.*
\)*\l[[:alnum:]_@]*' contains=erlangComment
--
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