* bug#73877: 30; rust-ts-mode: highlight the possible type suffix of number literals
@ 2024-10-19 10:56 Christophe TROESTLER
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From: Christophe TROESTLER @ 2024-10-19 10:56 UTC (permalink / raw)
To: 73877
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Hi,
In order to make Rust number literals such as 1usize, 1.0_f64,... more legible, the type suffix should be highlighted. The attached patch to rust-ts-mode does that.
Best,
Christophe
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From e1cf2f8c59f2abd75688721d08653327c5427da9 Mon Sep 17 00:00:00 2001
From: Christophe Troestler <Christophe.Troestler@umons.ac.be>
Date: Fri, 18 Oct 2024 23:50:06 +0200
Subject: [PATCH] rust-ts-mode: highlight the possible type suffix of number
literals
Content-Type: text/plain; charset="utf-8"
---
lisp/progmodes/rust-ts-mode.el | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/lisp/progmodes/rust-ts-mode.el b/lisp/progmodes/rust-ts-mode.el
index 571ffa9b220..0454c46261f 100644
--- a/lisp/progmodes/rust-ts-mode.el
+++ b/lisp/progmodes/rust-ts-mode.el
@@ -116,6 +116,12 @@ rust-ts-mode--indent-rules
((parent-is "use_list") parent-bol rust-ts-mode-indent-offset)))
"Tree-sitter indent rules for `rust-ts-mode'.")
+(defconst rust-ts-mode--number-types
+ (regexp-opt '("u8" "i8" "u16" "i16" "u32" "i32" "u64"
+ "i64" "u128" "i128" "usize" "isize" "f32" "f64"))
+ "Regexp that matches any suffix on number litterals as documented
+at https://doc.rust-lang.org/reference/tokens.html#suffixes")
+
(defvar rust-ts-mode--builtin-macros
'("concat_bytes" "concat_idents" "const_format_args"
"format_args_nl" "log_syntax" "trace_macros" "assert" "assert_eq"
@@ -221,7 +227,8 @@ rust-ts-mode--font-lock-settings
:language 'rust
:feature 'number
- '([(float_literal) (integer_literal)] @font-lock-number-face)
+ '([(float_literal) (integer_literal)]
+ @rust-ts-mode--fontify-number-literal)
:language 'rust
:feature 'operator
@@ -365,6 +372,22 @@ 'rust-ts-mode--fontify-pattern
(treesit-node-start id) (treesit-node-end id)
'font-lock-variable-name-face override start end)))))))
+(defun rust-ts-mode--fontify-number-literal (node override start stop &rest _)
+ "Fontify number literals, highlighting the optional type if present"
+ (let* ((beg (treesit-node-start node))
+ (end (treesit-node-end node)))
+ (save-excursion
+ (goto-char end)
+ (if (looking-back rust-ts-mode--number-types beg)
+ (let* ((ty (match-beginning 0))
+ (nb (if (eq (char-before ty) ?_) (1- ty) ty)))
+ (treesit-fontify-with-override
+ ty end 'font-lock-type-face override start stop)
+ (treesit-fontify-with-override
+ beg nb 'font-lock-number-face override start stop))
+ (treesit-fontify-with-override
+ beg end 'font-lock-number-face override start stop)))))
+
(defun rust-ts-mode--defun-name (node)
"Return the defun name of NODE.
Return nil if there is no name or if NODE is not a defun node."
--
2.45.2
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2024-10-19 10:56 bug#73877: 30; rust-ts-mode: highlight the possible type suffix of number literals Christophe TROESTLER
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