Emacs syntax highlighting and file-type detection

misc/emacs/README.md

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+# QL syntax highlighting and file-type detection for Emacs
+
+To install, add this directory to the `load-path` and add load the mode in the Emacs init file.
+
+Example:
+
+```elisp
+;  ~/.emacs, ~/.emacs.el, or ~/.emacs.d/init.el
+
+; ...
+
+(add-to-list 'load-path "~/ql/misc/emacs")
+(require 'ql-mode-base)
+
+; ...
+```

misc/emacs/ql-mode-base.el

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+;;; ql-mode-base.el --- A major mode for editing QL files
+
+;;; Commentary:
+;;
+;; A basic major mode for editing QL files, a more advanced major
+;; mode is available for internal use at Semmle.
+;;
+;; Provides syntax highlightning, comment support, and a mode-specific
+;; keymap.
+
+;;; Code:
+
+(defconst ql--at-type-regex "\\_<@\\w+\\>")
+(defconst ql--predicate-regex "\\(\\_<\\w+\\(\\+\\|\\*\\)?\\_>\\)\\s-*(")
+(defconst ql--primitive-type-regex (regexp-opt '("int" "string" "float" "boolean" "date") 'symbols))
+(defconst ql--annotation-regex (regexp-opt '("abstract" "cached" "external" "final" "transient" "library" "private" "deprecated" "override" "query" "pragma" "language" "bindingset") 'words))
+(defconst ql--annotation-arg-regex (regexp-opt '("inline" "noinline" "nomagic" "noopt" "monotonicAggregates") 'words))
+(defconst ql--keywords
+  '("and" "any" "as" "asc" "avg" "boolean" "by" "class" "concat" "count" "date" "desc" "else" "exists" "extends" "false" "float" "forall" "forex" "from" "if" "implies" "import" "in" "instanceof" "int" "max" "min" "module" "not" "none" "or" "order" "predicate" "rank" "result" "select" "strictconcat" "strictcount" "strictsum" "string" "sum" "super" "then" "this" "true" "where"
+    )
+  )
+
+(defconst ql--highlights
+  `((,ql--predicate-regex 1 'font-lock-function-name-face)
+    (,ql--primitive-type-regex . 'font-lock-type-face)
+    (,ql--at-type-regex 0 'font-lock-type-face)
+    (,ql--annotation-regex . 'font-lock-preprocessor-face)
+    (,ql--annotation-arg-regex . 'font-lock-keyword-face))
+  )
+
+(defvar ql-mode-base-map
+  (let ((map (make-sparse-keymap)))
+    map)
+  "Keymap for `ql-mode-base'.")
+
+(defvar ql-mode-base-hook nil "Hook run after entering ql-mode-base.")
+
+(define-generic-mode
+    ql-mode-base
+
+  ;; comments
+  nil
+
+  ;; keywords
+  ql--keywords
+
+  ;; other things to highlight
+  ql--highlights
+
+  ;; auto mode alist
+  '("\\.qll?$")
+
+  ;; other function to run
+  (list (lambda ()
+          (use-local-map ql-mode-base-map)
+
+          (modify-syntax-entry ?_ "w" (syntax-table))
+          ;; // Comments (style a)
+          (modify-syntax-entry ?\/ ". 124" (syntax-table))
+          (modify-syntax-entry ?\n "> " (syntax-table))
+          ;; /* Comments (style b) */
+          (modify-syntax-entry ?* ". 23b" (syntax-table))
+          (modify-syntax-entry ?@ "_" (syntax-table))
+
+          (set (make-local-variable 'comment-start) "//")
+          (set (make-local-variable 'comment-start-skip) "// ")
+
+          (run-hooks 'ql-mode-base-hook)
+
+          ))
+  "A basic major mode for QL files")
+
+(provide 'ql-mode-base)
+;;; ql-mode-base.el ends here