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;;; guile-syntax-highlight --- General-purpose syntax highlighter
;;; Copyright © 2023 David Thompson <davet@gnu.org>
;;;
;;; Guile-syntax-highlight is free software; you can redistribute it
;;; and/or modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 3 of the License, or (at your option) any later version.
;;;
;;; Guile-syntax-highlight 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 Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with guile-syntax-highlight. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Syntax highlighting for JavaScript.
;;
;;; Code:
(define-module (syntax-highlight javascript)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (syntax-highlight lexers)
#:export (lex-javascript))
(define %js-reserved-words
'("async" "await" "break" "case" "catch" "class" "const" "continue"
"debugger" "default" "delete" "do" "else" "export" "extends" "false"
"finally" "for" "function" "if" "import" "in" "instanceof" "let" "new"
"null" "return" "static" "super" "switch" "this" "throw" "true" "try"
"typeof" "var" "void" "while" "with" "yield"))
(define (js-reserved-word? str)
(any (cut string=? <> str) %js-reserved-words))
(define %js-operators
'(";" "," "." "?." "..." "#" "=" "+=" "-=" "*=" "/=" "%=" "<<=" ">>="
">>>=" "&=" "^=" "|=" "**=" "&&=" "||=" "??=" "?" ":" "||" "&&" "??"
"|" "^" "&" "~" "==" "===" "!=" "!==" "<=" ">=" "<" ">" "<<" ">>" ">>>"
"*" "/" "%" "!" "++" "--" "+" "-" ))
(define lex-js-operator
(lex-any* (map lex-string %js-operators)))
;; A rough approximation of characters that are allowed in Javascript
;; variables, numbers, etc.
(define char-set:js-identifier
(char-set-adjoin char-set:letter+digit #\$ #\_))
(define lex-js-identifier
(lex-char-set char-set:js-identifier))
;; TODO: Highlight regexp literals.
(define lex-javascript
(lex-consume
(lex-any (lex-char-set char-set:whitespace)
(lex-tag 'open (lex-any* (map lex-string '("(" "[" "{"))))
(lex-tag 'close (lex-any* (map lex-string '(")" "]" "}"))))
(lex-tag 'comment (lex-any (lex-delimited "//" #:until "\n")
(lex-delimited "/*" #:until "*/")
(lex-delimited "#!" #:until "\n")))
(lex-tag 'special (lex-filter js-reserved-word? lex-js-identifier))
(lex-tag 'operator lex-js-operator)
(lex-tag 'string (lex-any (lex-delimited "\"")
(lex-delimited "'")))
;; TODO: Highlight expressions within template literals.
(lex-tag 'template (lex-delimited "`"))
(lex-tag 'symbol lex-js-identifier))))
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