104 lines
3.3 KiB
EmacsLisp
104 lines
3.3 KiB
EmacsLisp
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;;; gsexp.el --- GraphQl as S-expressions -*- lexical-binding:t -*-
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;; Copyright (C) 2016-2026 Jonas Bernoulli
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;; Author: Jonas Bernoulli <emacs.ghub@jonas.bernoulli.dev>
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;; Homepage: https://github.com/magit/ghub
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;; Keywords: tools
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;; SPDX-License-Identifier: GPL-3.0-or-later
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;; This file is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published
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;; by the Free Software Foundation, either version 3 of the License,
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;; or (at your option) any later version.
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;;
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this file. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library encodes S-expressions as GraphQl documents. Currently
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;; it is rather incomplete and only intended for use by `ghub-graphql'
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;; but I might fill the gaps and add documentation eventually. I am
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;; not in a hurry though.
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;;; Code:
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(require 'cl-lib)
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(require 'compat)
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(defvar gsexp-one-variable-per-line nil)
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(defun gsexp-encode (document)
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(gsexp--pp (gsexp--encode-field document)))
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(defun gsexp--encode-field (field)
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(cond
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((stringp field)
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field)
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((symbolp field)
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(symbol-name field))
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((listp (car field))
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(concat (format "%s: " (caar field))
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(gsexp--encode-field (cons (car (cdar field))
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(cdr field)))))
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((concat
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(pcase (pop field)
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(`[] "")
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((and (pred symbolp) op) (symbol-name op))
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(`[,op] (symbol-name op))
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(`[,op ,name] (format "%s %s" op name)))
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(and (vectorp (car field))
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(format " (%s%s)"
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(if gsexp-one-variable-per-line "\n" "")
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(mapconcat #'gsexp--encode-argument
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(append (pop field) nil)
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(if gsexp-one-variable-per-line ",\n" ","))))
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(and field
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(format " {\n%s\n}"
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(mapconcat #'gsexp--encode-field field "\n")))))))
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(cl-defun gsexp--encode-argument ((argument value))
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(format "%s: %s" argument (gsexp--encode-value value)))
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(defun gsexp--encode-value (value)
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(cond
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((numberp value)
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(number-to-string value))
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((symbolp value) ; including variables, enums, booleans and null
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(symbol-name value))
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((stringp value)
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(prin1-to-string value))
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((vectorp value)
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(format "(%s)" (mapconcat #'gsexp--encode-value value "")))
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((listp value)
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(format "{%s}" (mapconcat
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(pcase-lambda (`(,name ,value))
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(format "%s: %s" name (gsexp--encode-value value)))
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value ", ")))
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((error "Invalid field value: %S" value))))
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(defun gsexp--pp (string)
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(with-temp-buffer
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(save-excursion
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(insert string))
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(while (< (point) (point-max))
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(unless (and (bolp) (eolp))
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(save-excursion
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(let ((level (car (syntax-ppss (line-beginning-position)))))
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(when (looking-at "\\s-*\\s)")
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(decf level))
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(indent-line-to (* 2 level)))))
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(forward-line 1))
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(buffer-string)))
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;;; _
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(provide 'gsexp)
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;;; gsexp.el ends here
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