Change signature of tree-sitter font-lock functions

Change from

(START END NODE OVERRIDE &rest _)

to

(NODE OVERRIDE &rest _)

START and END aren't used frequently enough to justify.  If a
fontification function needs them, it can get them from NODE.

* doc/lispref/modes.texi (Parser-based Font Lock): Update manual.

* lisp/progmodes/js.el (js--fontify-template-string)
* lisp/progmodes/python.el (python--treesit-fontify-string)
(python--treesit-fontify-string-end): Change signature.

* lisp/treesit.el (treesit-font-lock-rules): Update docstring.
(treesit-font-lock-fontify-region): Remove START and END arguments.

4 files changed, 19 insertions, 20 deletions

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index 40d966ef17a..3c91893bbfd 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -3979,14 +3979,13 @@ with that face.
 
 @findex treesit-fontify-with-override
 Capture names can also be function names, in which case the function
-is called with 4 arguments: @var{start}, @var{end}, @var{node}, and
-@var{override}, where @var{start} and @var{end} are the start and end
-position of the node in buffer, @var{node} is the node itself, and
-@var{override} is the override property of the rule which captured
-this node.  (If this function wants to respect the @var{override}
-argument, it can use @code{treesit-fontify-with-override}.)  Beyond
-the 4 arguments presented, this function should accept more arguments
-as optional arguments for future extensibility.
+is called with 2 arguments: @var{node} and @var{override}, where
+@var{node} is the node itself, and @var{override} is the override
+property of the rule which captured this node.  (If this function
+wants to respect the @var{override} argument, it can use
+@code{treesit-fontify-with-override}.)  Beyond the 2 arguments
+presented, this function should accept more arguments as optional
+arguments for future extensibility.
 
 If a capture name is both a face and a function, the face takes
 priority.  If a capture name is neither a face nor a function, it is
diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index e50bc9017ca..76d4ec748a0 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -3573,19 +3573,19 @@ This function is intended for use in `after-change-functions'."
       @font-lock-constant-face)))
   "Tree-sitter font-lock settings.")
 
-(defun js--fontify-template-string (beg end node override &rest _)
+(defun js--fontify-template-string (node override &rest _)
   "Fontify template string but not substitution inside it.
 BEG, END, NODE refers to the template_string node.
 
 OVERRIDE is the override flag described in
 `treesit-font-lock-rules'."
-  (ignore end)
   ;; You would have thought that the children of the string node spans
   ;; the whole string.  No, the children of the template_string only
   ;; includes the starting "`", any template_substitution, and the
   ;; closing "`".  That's why we have to track BEG instead of just
   ;; fontifying each child.
-  (let ((child (treesit-node-child node 0)))
+  (let ((child (treesit-node-child node 0))
+        (beg (treesit-node-start node)))
     (while child
       (if (equal (treesit-node-type child) "template_substitution")
           (treesit-fontify-with-override
diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index f741688363e..46559db2cd1 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1015,7 +1015,7 @@ It makes underscores and dots word constituent chars.")
     "VMSError" "WindowsError"
     ))
 
-(defun python--treesit-fontify-string (_beg _end node override &rest _)
+(defun python--treesit-fontify-string (node override &rest _)
   "Fontify string.
 NODE is the leading quote in the string.  Do not fontify the initial
 f for f-strings.  OVERRIDE is the override flag described in
@@ -1035,7 +1035,7 @@ f for f-strings.  OVERRIDE is the override flag described in
       (cl-incf string-beg))
     (treesit-fontify-with-override string-beg string-end face override)))
 
-(defun python--treesit-fontify-string-end (_beg _end node &rest _)
+(defun python--treesit-fontify-string-end (node &rest _)
   "Mark the whole string as to-be-fontified.
 NODE is the ending quote of a string."
   (let ((string (treesit-node-parent node)))
diff --git a/lisp/treesit.el b/lisp/treesit.el
index b4f79dc1572..248c23bf888 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -503,12 +503,12 @@ Other keywords include:
 Capture names in QUERY should be face names like
 `font-lock-keyword-face'.  The captured node will be fontified
 with that face.  Capture names can also be function names, in
-which case the function is called with (START END NODE OVERRIDE),
-where START and END are the start and end position of the node in
-buffer, NODE is the tree-sitter node object, and OVERRIDE is the
-override option of that rule.  This function should accept more
-arguments as optional arguments for future extensibility.  If a
-capture name is both a face and a function, the face takes
+which case the function should have a signature (NODE OVERRIDE
+&rest _), where NODE is the tree-sitter node object, and OVERRIDE
+is the override option of that rule.  This function should accept
+more arguments as optional arguments for future extensibility.
+
+If a capture name is both a face and a function, the face takes
 priority.  If a capture name is not a face name nor a function
 name, it is ignored.
 
@@ -672,7 +672,7 @@ If LOUDLY is non-nil, display some debugging information."
                  ((facep face)
                   (treesit-fontify-with-override start end face override))
                  ((functionp face)
-                  (funcall face start end node override)))
+                  (funcall face node override)))
                 ;; Don't raise an error if FACE is neither a face nor
                 ;; a function.  This is to allow intermediate capture
                 ;; names used for #match and #eq.