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gpr-ts-mode.el
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;;; gpr-ts-mode.el --- Major mode for GNAT project files using Tree-Sitter -*- lexical-binding: t; -*-
;; Copyright (C) 2023-2025 Troy Brown
;; Author: Troy Brown <[email protected]>
;; Created: February 2023
;; Version: 0.7.3
;; Keywords: gpr gnat ada languages tree-sitter
;; URL: https://github.com/brownts/gpr-ts-mode
;; Package-Requires: ((emacs "29.1"))
;; This file is not part of GNU Emacs.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This package provides GNAT Project syntax highlighting, indentation
;; and navigation using Tree-Sitter. To use the `gpr-ts-mode' major
;; mode you will need the appropriate grammar installed. By default,
;; on mode startup if the grammar is not detected, you will be
;; prompted to automatically install it.
;;; Code:
(require 'cl-generic)
(require 'lisp-mnt)
(require 'treesit)
(eval-when-compile (require 'rx))
(declare-function treesit-available-p "treesit.c")
(declare-function treesit-induce-sparse-tree "treesit.c")
(declare-function treesit-language-available-p "treesit.c")
(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-node-check "treesit.c")
(declare-function treesit-node-child-by-field-name "treesit.c")
(declare-function treesit-node-child-count "treesit.c")
(declare-function treesit-node-end "treesit.c")
(declare-function treesit-node-eq "treesit.c")
(declare-function treesit-node-next-sibling "treesit.c")
(declare-function treesit-node-parent "treesit.c")
(declare-function treesit-node-prev-sibling "treesit.c")
(declare-function treesit-node-start "treesit.c")
(declare-function treesit-node-type "treesit.c")
(defgroup gpr-ts nil
"Major mode for GNAT Project files, using Tree-Sitter."
:group 'languages
:link '(emacs-library-link :tag "Source" "gpr-ts-mode.el")
:link `(url-link :tag "Website"
,(lm-website (locate-library "gpr-ts-mode.el")))
:link '(custom-manual "(gpr-ts-mode)Top")
:prefix "gpr-ts-mode-")
(defcustom gpr-ts-mode-imenu-categories
'(attribute package type variable with-clause)
"Configuration of Imenu categories."
:type '(repeat :tag "Categories"
(choice :tag "Category"
(const :tag "Attribute Declaration" attribute)
(const :tag "Package Declaration" package)
(const :tag "Project Declaration" project)
(const :tag "Type Declaration" type)
(const :tag "Typed Variable Declaration" typed-variable)
(const :tag "Untyped Variable Declaration" untyped-variable)
(const :tag "Typed and Untyped Variable Declaration" variable)
(const :tag "With Clause" with-clause)))
:group 'gpr-ts
:link '(custom-manual :tag "Imenu" "(gpr-ts-mode)Imenu")
:package-version '(gpr-ts-mode . "0.6.0"))
(defcustom gpr-ts-mode-imenu-category-name-alist
'((attribute . "Attribute")
(package . "Package")
(project . "Project")
(type . "Type")
(typed-variable . "Typed Variable")
(untyped-variable . "Untyped Variable")
(variable . "Variable")
(with-clause . "With Clause"))
"Configuration of Imenu category names."
:type '(alist :key-type (symbol :tag "Category")
:value-type (string :tag "Category Name"))
:group 'gpr-ts
:link '(custom-manual :tag "Imenu" "(gpr-ts-mode)Imenu")
:package-version '(gpr-ts-mode . "0.6.0"))
(defcustom gpr-ts-mode-indent-offset 3
"Indentation of statements."
:type 'integer
:group 'gpr-ts
:link '(custom-manual :tag "Indentation" "(gpr-ts-mode)Indentation")
:package-version '(gpr-ts-mode . "0.5.0"))
;;;###autoload(put 'gpr-ts-mode-indent-offset 'safe-local-variable #'integerp)
(defcustom gpr-ts-mode-indent-when-offset gpr-ts-mode-indent-offset
"Indentation of `when' relative to `case'."
:type 'integer
:group 'gpr-ts
:link '(custom-manual :tag "Indentation" "(gpr-ts-mode)Indentation")
:package-version '(gpr-ts-mode . "0.5.0"))
;;;###autoload(put 'gpr-ts-mode-indent-when-offset 'safe-local-variable #'integerp)
(defcustom gpr-ts-mode-indent-broken-offset (- gpr-ts-mode-indent-offset 1)
"Indentation for the continuation of a broken line."
:type 'integer
:group 'gpr-ts
:link '(custom-manual :tag "Indentation" "(gpr-ts-mode)Indentation")
:package-version '(gpr-ts-mode . "0.5.0"))
;;;###autoload(put 'gpr-ts-mode-indent-broken-offset 'safe-local-variable #'integerp)
(defcustom gpr-ts-mode-indent-exp-item-offset (- gpr-ts-mode-indent-offset 1)
"Indentation for the continuation of an expression."
:type 'integer
:group 'gpr-ts
:link '(custom-manual :tag "Indentation" "(gpr-ts-mode)Indentation")
:package-version '(gpr-ts-mode . "0.5.0"))
;;;###autoload(put 'gpr-ts-mode-indent-exp-item-offset 'safe-local-variable #'integerp)
(defcustom gpr-ts-mode-indent-strategy 'declaration
"Indentation strategy to utilize."
:type '(choice :tag "Indentation Strategy"
(const :tag "Declaration" declaration)
(const :tag "Line" line))
:group 'gpr-ts
:link '(custom-manual :tag "Indentation" "(gpr-ts-mode)Indentation")
:package-version '(gpr-ts-mode . "0.6.0"))
(defcustom gpr-ts-mode-grammar "https://github.com/brownts/tree-sitter-gpr"
"Configuration for downloading and installing the tree-sitter language grammar.
Additional settings beyond the git repository can also be
specified. See `treesit-language-source-alist' for full details."
:type '(choice (string :tag "Git Repository")
(list :tag "All Options"
(string :tag "Git Repository")
(choice :tag "Revision" (const :tag "Default" nil) string)
(choice :tag "Source Directory" (const :tag "Default" nil) string)
(choice :tag "C Compiler" (const :tag "Default" nil) string)
(choice :tag "C++ Compiler" (const :tag "Default" nil) string)))
:group 'gpr-ts
:link '(custom-manual :tag "Grammar Installation" "(gpr-ts-mode)Grammar Installation")
:package-version '(gpr-ts-mode . "0.5.0"))
(defcustom gpr-ts-mode-grammar-install 'prompt
"Configuration for installation of tree-sitter language grammar library."
:type '(choice (const :tag "Automatically Install" auto)
(const :tag "Prompt to Install" prompt)
(const :tag "Do not install" nil))
:group 'gpr-ts
:link '(custom-manual :tag "Grammar Installation" "(gpr-ts-mode)Grammar Installation")
:package-version '(gpr-ts-mode . "0.5.0"))
(defcustom gpr-ts-mode-package-names
'(;; Intrinsic
"Binder" "Builder" "Clean" "Compiler" "Gnatls"
"Install" "Linker" "Naming" "Remote"
;; IDE related
"IDE" "Ant" "Make"
;; Extra tools
"Analyzer" "Check" "Codepeer" "Coverage" "DSA"
"Documentation" "Emulator" "GNATtest" "Format"
"Metrics" "Pretty_Printer" "Prove" "QGen"
"Stack" "Stub"
;; Legacy
"Cross_Reference" "Eliminate" "Finder"
"GNATstub" "Synchronize")
"List of known package names."
:type '(repeat string)
:group 'gpr-ts
:link '(custom-manual :tag "Syntax Highlighting" "(gpr-ts-mode)Syntax Highlighting")
:package-version '(gpr-ts-mode . "0.6.0"))
;;;###autoload(put 'gpr-ts-mode-package-names 'safe-local-variable #'list-of-strings-p)
(defvar gpr-ts-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?- ". 12" table)
(modify-syntax-entry ?= "." table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?\| "." table)
(modify-syntax-entry ?> "." table)
(modify-syntax-entry ?\' "." table)
(modify-syntax-entry ?\\ "." table)
(modify-syntax-entry ?\n ">" table)
table)
"Syntax table for `gpr-ts-mode'.")
(defun gpr-ts-mode--indent-recompute (symbol newval operation where)
"Recompute indentation variables when SYMBOL is changed.
SYMBOL is expected to be `gpr-ts-mode-indent-offset', and
OPERATION is queried to check that it is a `set' operation (as
defined by `add-variable-watcher'), otherwise nothing is updated.
Assuming the global value has not been updated by the user, the
indentation variables are updated using the NEWVAL of SYMBOL and
made buffer-local WHERE indicates a buffer-local modification of
SYMBOL, else the default value is updated instead."
(when (and (eq symbol 'gpr-ts-mode-indent-offset)
(eq operation 'set))
(dolist (indent-symbol '(gpr-ts-mode-indent-when-offset
gpr-ts-mode-indent-broken-offset
gpr-ts-mode-indent-exp-item-offset))
(let* ((valspec (or (custom-variable-theme-value indent-symbol)
(get indent-symbol 'standard-value)))
(cur-custom-value (eval (car valspec)))
;; This routine is invoked before SYMBOL is updated to
;; NEWVAL so we need to bind it to the new value so the
;; other indentation variables are evaluated using the
;; updated value.
(gpr-ts-mode-indent-offset newval)
(new-custom-value (eval (car valspec))))
;; Only update if not globally modified by the user outside of
;; the customization system (e.g., via `set-default'), or the
;; symbol is already buffer local.
(when (or (eql cur-custom-value (default-value indent-symbol))
(and where (buffer-local-boundp indent-symbol where)))
(if where
(with-current-buffer where
(set (make-local-variable indent-symbol) new-custom-value))
(set-default indent-symbol new-custom-value)))))))
(add-variable-watcher 'gpr-ts-mode-indent-offset #'gpr-ts-mode--indent-recompute)
(defvar gpr-ts-mode--keywords
'("abstract" "all" "at"
"case"
"end" "extends" "external" "external_as_list"
"for"
"is"
"limited"
"null"
"others"
"package" ;"project"
"renames"
"type"
"use"
"when" "with")
"GPR keywords for tree-sitter font-locking.")
(defun gpr-ts-mode--anchor-first-sibling-matching (type)
"Position of first sibling of node whose type matches TYPE."
(lambda (_n parent &rest _)
(treesit-node-start
(car
(treesit-filter-child
parent
(lambda (n)
(equal (treesit-node-type n) type)))))))
(defun gpr-ts-mode--after-first-sibling-p (sibling)
"Determine if the location of node comes after SIBLING."
(lambda (_node parent bol &rest _)
(if-let* ((sibling-node
(gpr-ts-mode--first-child-matching parent sibling)))
(< (treesit-node-start sibling-node) bol))))
(defun gpr-ts-mode--before-first-sibling-p (sibling)
"Determine if the location of node comes before SIBLING."
(lambda (_node parent bol &rest _)
(if-let* ((sibling-node
(gpr-ts-mode--first-child-matching parent sibling)))
(> (treesit-node-start sibling-node) bol)
;; if it doesn't exist, node is before it
t)))
(defun gpr-ts-mode--between-siblings-p (first-sibling last-sibling)
"Determine if node is between FIRST-SIBLING and LAST-SIBLING."
(lambda (node parent bol &rest _)
(let ((after (gpr-ts-mode--after-first-sibling-p first-sibling))
(before (gpr-ts-mode--before-first-sibling-p last-sibling)))
(and (funcall after node parent bol)
(funcall before node parent bol)))))
(defun gpr-ts-mode--sibling-exists-p (sibling)
"Determine if SIBLING exists."
(lambda (_node parent _bol &rest _)
(gpr-ts-mode--first-child-matching parent sibling)))
(defun gpr-ts-mode--next-sibling (node parent bol &rest _)
"Determine next sibling in PARENT after this NODE or BOL."
(if node
(treesit-node-next-sibling node)
(car
(treesit-filter-child
parent
(lambda (n)
(> (treesit-node-start n) bol))))))
(defalias 'gpr-ts-mode--next-sibling-exists-p
'gpr-ts-mode--next-sibling)
(defun gpr-ts-mode--next-sibling-not-matching (type)
"Locate next sibling not matching TYPE."
(lambda (node parent bol &rest _)
(let ((sibling-node (gpr-ts-mode--next-sibling node parent bol)))
(while (and sibling-node
(equal (treesit-node-type sibling-node) type))
(setq sibling-node (treesit-node-next-sibling sibling-node)))
sibling-node)))
(defalias 'gpr-ts-mode--next-sibling-not-matching-exists-p
'gpr-ts-mode--next-sibling-not-matching)
(defun gpr-ts-mode--anchor-of-next-sibling-not-matching (type)
"Determine indentation anchor of next sibling not matching TYPE."
(lambda (node parent bol &rest _)
(let ((sibling-node
(funcall (gpr-ts-mode--next-sibling-not-matching type) node parent bol)))
(car (treesit-simple-indent sibling-node parent (treesit-node-start sibling-node))))))
(defun gpr-ts-mode--prev-sibling (node parent bol &rest _)
"Determine previous sibling in PARENT before this NODE or BOL."
(if node
(treesit-node-prev-sibling node)
(car
(reverse
(treesit-filter-child
parent
(lambda (n)
(< (treesit-node-start n) bol)))))))
(defun gpr-ts-mode--prev-sibling-matches-p (type)
"Check if previous sibling matches TYPE."
(lambda (node parent bol &rest _)
(if-let* ((prev (gpr-ts-mode--prev-sibling node parent bol)))
(string-equal (treesit-node-type prev) type))))
(defun gpr-ts-mode--prev-nonextra-sibling-matches-p (type)
"Check if previous non-extra sibling matches TYPE."
(lambda (node parent bol &rest _)
(let ((prev (gpr-ts-mode--prev-sibling node parent bol)))
(while (and prev (treesit-node-check prev 'extra))
(setq prev (treesit-node-prev-sibling prev)))
(when prev
(string-equal (treesit-node-type prev) type)))))
(defun gpr-ts-mode--enclosing-compound (compound-info pos)
"Find enclosing compound, specified in COMPOUND-INFO, at POS.
COMPOUND-INFO is a list of compound node information. Each entry should
be of the form (FIRST-CHILD-NODE-TYPE . PROPS), where
FIRST-CHILD-NODE-TYPE is the type of the first child node of the
compound node. PROPS should have the form:
[KEYWORD VALUE]...
The following keywords are meaningful:
:compound-type
VALUE must be the type of the compound node. This is a required
property.
:predicate
VALUE must be a function which takes a candidate node (matching
FIRST-CHILD-NODE-TYPE) as well as the node at POS, if one exists, and
returns non-nil if the candidate is appropriate. This is an optional
property.
The returned node is the closest previous node matching
FIRST-CHILD-NODE-TYPE which is a child of the specified compound node
type and the compound node must enclose POS.
The returned node may also be the closest previous node matching
FIRST-CHILD-NODE-TYPE which is not a child of the specified compound
node. This is a suspected incomplete compound. When a predicate is
provided, it is used to disambiguate any usage of FIRST-CHILD-NODE-TYPE
elsewhere in the grammar and must return non-nil for the node to be
chosen."
(let* ((matches nil)
(node
(save-excursion
(goto-char pos)
(if-let* ((node (treesit-node-at pos)))
(and (<= (treesit-node-start node) pos)
(> (treesit-node-end node) pos)
node))))
(parent
(if node
(treesit-node-parent node)
(treesit-node-on pos pos))))
(while (and parent (not matches))
(setq matches
(treesit-induce-sparse-tree
parent
(lambda (candidate)
(when-let* (((< (treesit-node-start candidate) pos))
(type (treesit-node-type candidate))
(parent (treesit-node-parent candidate))
(parent-type (treesit-node-type parent))
(compound (cdr (assoc-string type compound-info)))
(compound-type (plist-get compound :compound-type)))
(if (string-equal parent-type compound-type)
(and (<= (treesit-node-start parent) pos)
(< pos (treesit-node-end parent)))
(let ((predicate (plist-get compound :predicate)))
(or (null predicate)
(funcall predicate candidate node))))))))
(setq parent (treesit-node-parent parent)))
(when matches
(caar (reverse matches)))))
(defun gpr-ts-mode--indent-error-recovery (op)
"Find indentation in the presence of syntax errors.
If OP is \\='anchor\\=', determine anchor. If OP is \\='offset\\=',
determine offset."
(lambda (node _parent bol &rest _)
(let ((node-type
(let ((type (treesit-node-type node)))
(when (and type (string-equal type "ERROR"))
;; Replace ERROR node with leaf node.
(setq node (treesit-node-at (treesit-node-start node)))
(setq type (treesit-node-type node)))
type))
anchor-node anchor-type)
;; look for enclosing parenthesis or declaration.
(let (force-compound prev-node prev-type)
(save-excursion
(goto-char bol)
(while (and (not anchor-node)
(not force-compound)
(not (bobp)))
(when prev-node
(goto-char (treesit-node-start prev-node)))
(skip-chars-backward " \t\n" (point-min))
(setq prev-node (if (bobp) nil (treesit-node-at (1- (point))))
prev-type (treesit-node-type prev-node))
(cond
;; parenthesis
((and prev-type (string-equal prev-type "("))
(let ((end
(ignore-error scan-error
(scan-lists (treesit-node-start prev-node) 1 0))))
(when (or (null end)
(> end bol))
;; End parenthesis either not found (i.e.,
;; unbalanced) or it was after bol, so it encloses
;; bol.
(if (and node (member node-type '("project" "package" "case")))
(setq force-compound t) ; Recovery point
(setq anchor-node prev-node
anchor-type prev-type)))))
;; declaration
((and (or (null prev-type)
(member prev-type '(";" "=>"))
(and (string-equal prev-type "is")
;; Only consider the "is" keyword as a
;; declaration separator when it's part of a
;; compound (e.g., project_declaration),
;; otherwise ignore it when it isn't (e.g.,
;; typed_string_declaration).
(let ((keywords (cons "project" gpr-ts-mode--keywords))
(compound-keywords '("project" "package" "case"))
(keyword-node prev-node)
(keyword-type prev-type))
(save-excursion
(while (and keyword-node
(or (treesit-node-eq keyword-node prev-node)
(not (member keyword-type keywords))))
(goto-char (treesit-node-start keyword-node))
(skip-chars-backward " \t\n")
(if (bobp)
(setq keyword-node nil)
(setq keyword-node (treesit-node-at (1- (point)))
keyword-type (treesit-node-type keyword-node)))))
(and keyword-node
(member keyword-type compound-keywords))))))
(let (next-node next-type)
(save-excursion
(skip-chars-forward " \t\n")
(setq next-node (if (eobp) nil (treesit-node-at (point)))
next-type (treesit-node-type next-node))
(while (and next-type
(string-equal next-type "comment"))
(goto-char (treesit-node-end next-node))
(skip-chars-forward " \t\n")
(setq next-node (if (eobp) nil (treesit-node-at (point)))
next-type (treesit-node-type next-node)))
(if next-node
(if (>= (treesit-node-start next-node) bol)
;; bol is either a newline or a comment,
;; so anchor to the compound.
(setq force-compound t)
(setq anchor-node next-node
anchor-type next-type))
(setq force-compound t)))))))))
;; look for enclosing compound
(unless anchor-node
(setq anchor-node
(gpr-ts-mode--enclosing-compound
'(("project" . ( :compound-type "project_declaration"
:predicate
;; Don't anchor to a "project" keyword
;; used in an attribute reference.
(lambda (anchor &optional _node)
(let* ((next (treesit-node-next-sibling anchor))
(next-type (treesit-node-type next)))
(or (null next-type)
(not (string-equal next-type "'")))))))
("package" . ( :compound-type "package_declaration"
:predicate
;; Don't allow a nested "package".
;; This is an indication of an
;; incomplete package declaration
;; prior to the start of another
;; package declaration.
(lambda (_anchor &optional node)
(or (null node)
(let ((type (treesit-node-type node)))
(not (string-equal type "package")))))))
("case" . ( :compound-type "case_construction"))
("when" . ( :compound-type "case_item")))
bol)
anchor-type (treesit-node-type anchor-node)))
(if (null anchor-node)
(pcase op
((or (pred null) 'anchor)
(when treesit--indent-verbose
(message "Error recovery anchor: %s" anchor-node))
(pos-bol))
('offset 0))
(pcase op
((or (pred null) 'anchor)
(when treesit--indent-verbose
(message "Error recovery anchor: %s" anchor-node))
(if (string-equal anchor-type "project")
;; Anchor at beginning of line to account for possible
;; qualifier prefixes (e.g., "abstract")
(save-excursion
(goto-char (treesit-node-start anchor-node))
(forward-line 0)
(treesit-node-start (treesit-node-at (point))))
(treesit-node-start anchor-node)))
('offset
;; Determine nodes after anchor and before bol
(let ((zero-offset-types
(append '(";" "project")
(seq-difference
gpr-ts-mode--keywords
'("external" "external_as_list"))))
nodes-before)
(save-excursion
(goto-char (treesit-node-end anchor-node))
(while (< (point) bol)
(skip-chars-forward " \t\n" bol)
(when (< (point) bol)
(let ((node (treesit-node-at (point))))
;; Find largest complete node starting at point.
(setq node
(or
(treesit-parent-while
node
(lambda (n)
(and
(not (string-equal (treesit-node-type n) "ERROR"))
(= (treesit-node-start n) (point)))))
node))
(push (treesit-node-type node) nodes-before)
(goto-char (treesit-node-end node))))))
(setq nodes-before (reverse nodes-before))
(pcase anchor-type
("when"
(cond
((member "=>" nodes-before) gpr-ts-mode-indent-offset)
(t gpr-ts-mode-indent-broken-offset)))
("case"
(cond
((and (member "is" nodes-before)
(not (member "end" nodes-before))
(or (null node) (not (string-equal node-type "end"))))
gpr-ts-mode-indent-when-offset)
((and node (member node-type zero-offset-types))
0)
(t gpr-ts-mode-indent-broken-offset)))
((or "package" "project")
(cond
((and (member "is" nodes-before)
(not (member "end" nodes-before))
(or (null node) (not (string-equal node-type "end"))))
gpr-ts-mode-indent-offset)
((and node (member node-type zero-offset-types))
0)
(t gpr-ts-mode-indent-broken-offset)))
("("
(if (and node-type (string-equal node-type ")"))
0
(let ((next-node anchor-node))
(while (and next-node
(or (treesit-node-eq next-node anchor-node)
;; skip comments
(string-equal (treesit-node-type next-node) "comment")))
(save-excursion
(goto-char (treesit-node-end next-node))
(skip-chars-forward " \t\n" bol)
(if (>= (point) bol)
(setq next-node nil)
(setq next-node (treesit-node-at (point))))))
(if next-node
(let ((anchor-column
(save-excursion
(goto-char (treesit-node-start anchor-node))
(current-column))))
(save-excursion
(goto-char (treesit-node-start next-node))
(- (current-column) anchor-column)))
1))))
(_ ; declaration
(if (and node (member node-type zero-offset-types))
0
gpr-ts-mode-indent-broken-offset))))))))))
(defun gpr-ts-mode--anchor-of-indent-error-recovery ()
"Determine indentation anchor of error recovery point."
(gpr-ts-mode--indent-error-recovery 'anchor))
(defun gpr-ts-mode--offset-of-indent-error-recovery ()
"Determine indentation offset of error recovery point."
(gpr-ts-mode--indent-error-recovery 'offset))
(defun gpr-ts-mode--offset-of-next-sibling-not-matching (type)
"Determine indentation offset of next sibling not matching TYPE."
(lambda (node parent bol &rest _)
(let ((sibling-node
(funcall (gpr-ts-mode--next-sibling-not-matching type) node parent bol)))
(cdr (treesit-simple-indent sibling-node parent (treesit-node-start sibling-node))))))
(defun gpr-ts-mode--anchor-next-sibling (node parent bol &rest _)
"Determine location of next sibling after NODE in PARENT or BOL."
(treesit-node-start
(gpr-ts-mode--next-sibling node parent bol)))
(defun gpr-ts-mode--anchor-prev-sibling-matching (sibling-type)
"Locate previous sibling matching SIBLING-TYPE."
(lambda (_node parent bol &rest _)
(treesit-node-start
(car
(last
(treesit-filter-child
parent
(lambda (n)
(and
(equal (treesit-node-type n) sibling-type)
(< (treesit-node-start n) bol)))))))))
(defun gpr-ts-mode--first-child-matching (parent type)
"Find first child of PARENT matching TYPE.
Return nil if no child of that type is found."
;; NOTE: `treesit-filter-child' uses `treesit-node-next-sibling'
;; which doesn't traverse parser-inserted "missing" nodes (seems
;; like a bug), so filter the nodes manually.
(seq-find
(lambda (n)
(string-equal (treesit-node-type n) type))
(treesit-node-children parent)))
(cl-defgeneric gpr-ts-mode-indent (strategy)
"Indent according to STRATEGY."
(error "Unknown indentation strategy: %s" strategy))
(cl-defmethod gpr-ts-mode-indent ((_strategy (eql line)))
"Indent according to line STRATEGY."
(treesit-indent))
(cl-defmethod gpr-ts-mode-indent ((_strategy (eql declaration)))
"Indent according to declaration STRATEGY."
(let ((initial-point-column (current-column))
(initial-indentation-column (current-indentation))
(region
(save-excursion
(forward-line 0)
(skip-chars-forward " \t")
(unless (looking-at (rx (* whitespace) eol) t)
(let* ((node (treesit-node-at (point)))
(root (treesit-buffer-root-node))
(candidate
(treesit-parent-until
node
(lambda (node)
(or (treesit-node-eq node root)
(string-equal (treesit-node-type node) "ERROR")
(gpr-ts-mode--declaration-p node)))
'include-node)))
(when (and (gpr-ts-mode--declaration-p candidate)
(not (treesit-search-subtree candidate "ERROR")))
;; Prevent interpreting a project declaration "end"
;; next to an incomplete package declaration as a
;; valid package declaration by checking if the names
;; match.
(unless
(and (gpr-ts-mode--package-declaration-p candidate)
(not (gpr-ts-mode--package-declaration-names-match-p candidate)))
(cons (treesit-node-start candidate)
(treesit-node-end candidate)))))))))
(if region
(progn
(treesit-indent-region (car region) (cdr region))
;; Move point if it was in the indentation.
(when (<= initial-point-column
initial-indentation-column)
(back-to-indentation)))
(treesit-indent))))
(defun gpr-ts-mode--indent-line ()
"Indent according to `gpr-ts-mode-indent-strategy'."
(gpr-ts-mode-indent gpr-ts-mode-indent-strategy))
(defvar gpr-ts-mode--indent-rules
`((gpr
;; Non-Parent-driven indentation
;; Indent empty lines immediately following a case_item as part
;; of the case_item. This allows additional lines to keep being
;; added to the case_item without causing indentation to jump
;; after each newline.
((and no-node
(gpr-ts-mode--prev-nonextra-sibling-matches-p "case_item"))
(gpr-ts-mode--anchor-first-sibling-matching "case_item")
gpr-ts-mode-indent-offset)
;; Error recovery rules.
((or (parent-is "ERROR")
(node-is "ERROR")
(gpr-ts-mode--prev-sibling-matches-p "ERROR"))
(gpr-ts-mode--anchor-of-indent-error-recovery)
(gpr-ts-mode--offset-of-indent-error-recovery))
;; Normal indentation rules.
((and (parent-is "case_construction")
(gpr-ts-mode--between-siblings-p "is" "end"))
parent
gpr-ts-mode-indent-when-offset)
;; general indentation for package and project declaration bodies.
((and (or (parent-is "project_declaration")
(parent-is "package_declaration"))
(gpr-ts-mode--between-siblings-p "is" "end"))
parent
gpr-ts-mode-indent-offset)
;; general indentation for comment.
;;
;; NOTE: Indent to where next non-comment sibling would be
;; indented. This may not be aligned to sibling if sibling isn't
;; properly indented, however it prevents a two-pass indentation
;; when region is indented, since comments won't have to be
;; reindented once sibling becomes properly aligned.
((and (node-is "comment")
(gpr-ts-mode--next-sibling-not-matching-exists-p "comment"))
(gpr-ts-mode--anchor-of-next-sibling-not-matching "comment")
(gpr-ts-mode--offset-of-next-sibling-not-matching "comment"))
((and (node-is ")")
(gpr-ts-mode--sibling-exists-p "("))
(gpr-ts-mode--anchor-first-sibling-matching "(")
0)
;; top-level
((parent-is ,(rx bos "project" eos)) column-0 0)
;; with_declaration
((and (parent-is "with_declaration")
(gpr-ts-mode--between-siblings-p "with" ";")
(gpr-ts-mode--after-first-sibling-p "string_literal"))
(gpr-ts-mode--anchor-first-sibling-matching "string_literal")
0)
;; expression / expression_list
((and (parent-is "expression_list")
(gpr-ts-mode--after-first-sibling-p "expression"))
(gpr-ts-mode--anchor-first-sibling-matching "expression")
0)
((parent-is "expression_list")
(gpr-ts-mode--anchor-first-sibling-matching "(")
1)
((parent-is ,(rx bos "expression" eos))
parent
gpr-ts-mode-indent-exp-item-offset)
((or (parent-is ,(rx bos "project_reference" eos))
(parent-is ,(rx bos "variable_reference" eos)))
parent
0)
((node-is "expression_list")
parent
gpr-ts-mode-indent-broken-offset)
((node-is ,(rx bos "expression" eos))
parent
gpr-ts-mode-indent-broken-offset)
;; typed_string_declaration
((and (parent-is "typed_string_declaration")
(gpr-ts-mode--between-siblings-p "(" ")")
(gpr-ts-mode--after-first-sibling-p "string_literal"))
(gpr-ts-mode--anchor-first-sibling-matching "string_literal")
0)
((and (parent-is "typed_string_declaration")
(gpr-ts-mode--between-siblings-p "(" ")"))
(gpr-ts-mode--anchor-first-sibling-matching "(")
1)
;; attribute_reference / attribute_declaration
((and (or (parent-is "attribute_reference")
(parent-is "attribute_declaration"))
(gpr-ts-mode--between-siblings-p "(" ")"))
(gpr-ts-mode--anchor-first-sibling-matching "(")
1)
;; attribute_declaration
((and (parent-is "attribute_declaration")
(node-is "("))
(gpr-ts-mode--anchor-first-sibling-matching "identifier")
gpr-ts-mode-indent-broken-offset)
;; case_construction / case_item / discrete_choice_list
((parent-is "discrete_choice_list")
parent
0)
((node-is "discrete_choice_list")
parent
gpr-ts-mode-indent-broken-offset)
((parent-is "case_item")
parent-bol
gpr-ts-mode-indent-offset)
((match "variable_reference" "case_construction")
parent-bol
gpr-ts-mode-indent-broken-offset)
;; general indentation for newline.
;;
;; NOTE: Indent to where next non-comment sibling would be
;; indented. This may not be aligned to sibling if sibling isn't
;; properly indented, however it prevents a two-pass indentation
;; when region is indented, since comments won't have to be
;; reindented once sibling becomes properly aligned.
((and no-node
(gpr-ts-mode--next-sibling-not-matching-exists-p "comment"))
(gpr-ts-mode--anchor-of-next-sibling-not-matching "comment")
(gpr-ts-mode--offset-of-next-sibling-not-matching "comment"))
;; variable_declaration
((node-is ,(rx bos (or ":" ":=") eos))
parent
gpr-ts-mode-indent-broken-offset)
;; name (e.g., identifier . identifier)
((parent-is ,(rx bos "name" eos))
parent
0)
;; name, identifier, string_literal and string_literal_at.
((or (node-is ,(rx bos "name" eos))
(node-is "identifier")
(node-is "string_literal")
(parent-is "string_literal_at"))
parent
gpr-ts-mode-indent-broken-offset)
;; keywords / semicolon / project / project qualifier
((or (node-is ,(eval `(rx bos (or ,@gpr-ts-mode--keywords ";") eos)))
(match ,(rx bos "project" eos) "project_declaration")
(parent-is "project_qualifier"))
parent
0)
;; non-expression opening parenthesis
((node-is "(") parent gpr-ts-mode-indent-broken-offset)
;; trivial recovery for unexpected broken line
(catch-all prev-line 0)))
"Tree-sitter indent rules for `gpr-ts-mode'.")
(defvar gpr-ts-mode--font-lock-settings
(treesit-font-lock-rules
;; Attributes
:language 'gpr
:feature 'attribute
'((attribute_reference (identifier) @font-lock-property-use-face))
;; Brackets
:language 'gpr
:feature 'bracket
'((["(" ")"]) @font-lock-bracket-face)
;; Comments
:language 'gpr
:feature 'comment
'((comment) @font-lock-comment-face)
;; Definition
:language 'gpr
:feature 'definition
'((package_declaration name: (identifier) @font-lock-function-name-face)
((package_declaration endname: (identifier) @font-lock-function-name-face)
@package-declaration
(:pred gpr-ts-mode--package-declaration-names-match-p @package-declaration))
(typed_string_declaration name: (identifier) @font-lock-type-face)
(variable_declaration name: (identifier) @font-lock-variable-name-face)
(attribute_declaration name: (identifier) @font-lock-property-name-face))
;; Delimiters
:language 'gpr
:feature 'delimiter
'(["," "." ":" ";"] @font-lock-delimiter-face)
;; Functions
:language 'gpr
:feature 'function
:override 'prepend
'((builtin_function_call name: _ @font-lock-function-call-face))
;; Keywords
:language 'gpr
:feature 'keyword
`(([,@gpr-ts-mode--keywords] @font-lock-keyword-face)
(project_declaration "project" @font-lock-keyword-face)
((project_qualifier) @font-lock-keyword-face))
;; Numeric literals
:language 'gpr
:feature 'number
'((numeric_literal) @font-lock-number-face)
;; Package
:language 'gpr
:feature 'package
'((package_declaration
[ origname: (name (identifier) @font-lock-function-call-face :anchor)
basename: (name (identifier) @font-lock-function-call-face :anchor)])
((variable_reference (name (identifier) @font-lock-function-call-face))
(:pred gpr-ts-mode--package-name-p @font-lock-function-call-face)))
;; String literals
:language 'gpr
:feature 'string
'((string_literal) @font-lock-string-face)
;; Types
:language 'gpr
:feature 'type
'((variable_declaration type: (name (identifier) @font-lock-type-face :anchor)))
;; Variables
:language 'gpr
:feature 'variable
:override t
'((variable_reference (name (identifier) @font-lock-variable-use-face :anchor) :anchor))
;; Operators
:language 'gpr
:feature 'operator
'([":=" "&" "|" "=>"] @font-lock-operator-face)
;; Syntax errors
:language 'gpr
:feature 'error
:override t
'((ERROR) @font-lock-warning-face))
"Font-lock settings for `gpr-ts-mode'.")
(defun gpr-ts-mode--package-name-p (node)
"Check if NODE identifier matches a known package name."
(let ((identifier (treesit-node-text node t)))
(seq-find
(apply-partially #'string-equal-ignore-case identifier)
gpr-ts-mode-package-names)))
(defun gpr-ts-mode--package-declaration-names-match-p (node)
"Check if names match in package declaration NODE."
(when (gpr-ts-mode--package-declaration-p node)
(let ((name (treesit-node-child-by-field-name node "name"))
(endname (treesit-node-child-by-field-name node "endname")))
(string-equal-ignore-case (treesit-node-text name t)
(treesit-node-text endname t)))))
;;; Imenu
(defun gpr-ts-mode--tree-text
(node &optional ignored-types region-beg-type region-end-type)
"Extract text found within the tree of NODE.
IGNORED-TYPES specifies a list of node types within the tree to ignore.
REGION-BEG-TYPE specifies the type of the first child node of NODE to
begin text extraction (exclusive). REGION-END-TYPE specifies the first
child node of NODE to end text extraction (exclusive). When
REGION-BEG-TYPE or REGION-END-TYPE are nil, the region is expanded to
the beginning or end of NODE respectively.
The extracted text will retain its text properties and the text of the
nodes will be uniformly spaced with the exception of parenthesis and
periods."
(let* ((beg (when region-beg-type
(treesit-node-end
(gpr-ts-mode--first-child-matching node region-beg-type))))
(end (when region-end-type
(treesit-node-start
(gpr-ts-mode--first-child-matching node region-end-type))))
(tree (treesit-induce-sparse-tree
node