bug#61142: 29.0.60; java-ts-mode - Wrong indentation for the body of multiple lines conditions

[Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Theodor Thornhill <theo@thornhill.no> writes:

> 太阳 <zjyzhaojiyang@hotmail.com> writes:
>
>> After reading treesit's manual, I found that we can use `n-p-gp` as the matcher
>> and `grand-parent` as the anchor to match the body of `if` (and `while`, which
>> has a similar issue).
>>
>> I mean a rule looks like the following:
>>
>> ```
>> ((n-p-gp nil "block" "if_statement") grand-parent java-ts-mode-indent-offset)
>> ```
>>
>>
>
>
> Thanks!  We have a mechanism in place for this, see
> 'c-ts-common-statement-offset' in 'c-ts-common.el'.  I didn't get to it
> yet, but I'll try to look at it this evening, unless you want to?  See
> c-ts-mode for examples of how to use it, if you're interested!
>
> Theo

Hi again!

Can you test this patch for me?

@Eli: Is this ok for emacs-29?  I'd love to add some test for this, but
now they are on the master branch.  What is the common procedure to move
stuff from master branch to the release branch?  I _can_ just add some
test to the master branch, but it would be nice to have them on emacs-29
too :-)

Theo


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From 18beb67646446363cec98e4074822b9fcf270d12 Mon Sep 17 00:00:00 2001
From: Theodor Thornhill <theo@thornhill.no>
Date: Sun, 5 Feb 2023 08:49:08 +0100
Subject: [PATCH] Use c-ts-common-statement-offset in java-ts-mode

* lisp/progmodes/java-ts-mode.el (java-ts-mode--indent-rules): Add new
matchers to enable c-ts-common machinery.
(java-ts-mode): Add regexps.
* lisp/progmodes/c-ts-common.el (c-ts-common-statement-offset): Fix
typo.
---
 lisp/progmodes/c-ts-common.el  |  2 +-
 lisp/progmodes/java-ts-mode.el | 34 +++++++++++++++++++++++++---------
 2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/lisp/progmodes/c-ts-common.el b/lisp/progmodes/c-ts-common.el
index 8729cae4ba..188734badb 100644
--- a/lisp/progmodes/c-ts-common.el
+++ b/lisp/progmodes/c-ts-common.el
@@ -285,7 +285,7 @@ c-ts-common-statement-offset
   "This anchor is used for children of a statement inside a block.
 
 This function basically counts the number of block nodes (i.e.,
-brackets) (defined by `c-ts-mode--indent-block-type-regexp')
+brackets) (defined by `c-ts-common-indent-block-type-regexp')
 between NODE and the root node (not counting NODE itself), and
 multiply that by `c-ts-common-indent-offset'.
 
diff --git a/lisp/progmodes/java-ts-mode.el b/lisp/progmodes/java-ts-mode.el
index b9f7894095..1b6f2ba8b3 100644
--- a/lisp/progmodes/java-ts-mode.el
+++ b/lisp/progmodes/java-ts-mode.el
@@ -70,22 +70,24 @@ java-ts-mode--syntax-table
 (defvar java-ts-mode--indent-rules
   `((java
      ((parent-is "program") point-min 0)
-     ((node-is "}") (and parent parent-bol) 0)
+     ((match "}" "element_value_array_initializer")
+      parent-bol 0)
+     ((node-is "}") point-min c-ts-common-statement-offset)
      ((node-is ")") parent-bol 0)
      ((node-is "]") parent-bol 0)
      ((and (parent-is "comment") c-ts-common-looking-at-star)
       c-ts-common-comment-start-after-first-star -1)
      ((parent-is "comment") prev-adaptive-prefix 0)
      ((parent-is "text_block") no-indent)
-     ((parent-is "class_body") parent-bol java-ts-mode-indent-offset)
+     ((parent-is "class_body") point-min c-ts-common-statement-offset)
      ((parent-is "array_initializer") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "annotation_type_body") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "interface_body") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "constructor_body") parent-bol java-ts-mode-indent-offset)
+     ((parent-is "annotation_type_body") point-min c-ts-common-statement-offset)
+     ((parent-is "interface_body") point-min c-ts-common-statement-offset)
+     ((parent-is "constructor_body") point-min c-ts-common-statement-offset)
      ((parent-is "enum_body_declarations") parent-bol 0)
-     ((parent-is "enum_body") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "switch_block") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "record_declaration_body") parent-bol java-ts-mode-indent-offset)
+     ((parent-is "enum_body") point-min c-ts-common-statement-offset)
+     ((parent-is "switch_block") point-min c-ts-common-statement-offset)
+     ((parent-is "record_declaration_body") point-min c-ts-common-statement-offset)
      ((query "(method_declaration (block _ @indent))") parent-bol java-ts-mode-indent-offset)
      ((query "(method_declaration (block (_) @indent))") parent-bol java-ts-mode-indent-offset)
      ((parent-is "local_variable_declaration") parent-bol java-ts-mode-indent-offset)
@@ -118,7 +120,7 @@ java-ts-mode--indent-rules
      ((parent-is "case_statement") parent-bol java-ts-mode-indent-offset)
      ((parent-is "labeled_statement") parent-bol java-ts-mode-indent-offset)
      ((parent-is "do_statement") parent-bol java-ts-mode-indent-offset)
-     ((parent-is "block") (and parent parent-bol) java-ts-mode-indent-offset)))
+     ((parent-is "block") point-min c-ts-common-statement-offset)))
   "Tree-sitter indent rules.")
 
 (defvar java-ts-mode--keywords
@@ -300,6 +302,20 @@ java-ts-mode
   (c-ts-common-comment-setup)
 
   ;; Indent.
+  (setq-local c-ts-common-indent-block-type-regexp
+              (rx (or "class_body"
+                      "\\`array_initializer"
+                      "annotation_type_body"
+                      "interface_body"
+                      "interface_constructor_body"
+                      "enum_body"
+                      "switch_block"
+                      "record_declaration_body"
+                      "block")))
+  (setq-local c-ts-common-indent-bracketless-type-regexp
+              (rx (or "if_statement" "do_statement"
+                      "for_statement" "while_statement")))
+  (setq-local c-ts-common-indent-offset 'java-ts-mode-indent-offset)
   (setq-local treesit-simple-indent-rules java-ts-mode--indent-rules)
 
   ;; Electric
-- 
2.34.1