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;;; Chickadee Game Toolkit
;;; Copyright © 2023 David Thompson <dthompson2@worcester.edu>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
(define-module (chickadee graphics seagull syntax)
#:use-module (chickadee graphics seagull utils)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:use-module (system syntax internal)
#:export (<syntax>
make-seagull-syntax
seagull-syntax?
seagull-syntax-source
seagull-syntax-expression
seagull-syntax->sexp
build-syntax
$gl
&seagull-syntax-error
seagull-syntax-error
seagull-syntax-error-syntax))
(define-record-type <syntax>
(make-seagull-syntax source exp)
seagull-syntax?
(source seagull-syntax-source)
(exp seagull-syntax-expression))
(define (seagull-syntax->sexp syntax)
(match (seagull-syntax-expression syntax)
((children ...)
(map seagull-syntax->sexp children))
(atom atom)))
(define (build-syntax src exp)
(match exp
((? seagull-syntax?)
exp)
((children ...)
(make-seagull-syntax src
(map (lambda (child)
(build-syntax src child))
children)))
(atom
(make-seagull-syntax src atom))))
;; Annotate seagull expressions with source information, producing
;; seagull-specific syntax objects that can't be confused with scheme
;; syntax objects.
(define-syntax $gl
(lambda (x)
(syntax-case x ()
((_ exp)
(with-syntax ((src (datum->syntax x (syntax-sourcev #'exp))))
#'(make-seagull-syntax src ($gl-recur exp)))))))
;; Helper macro to annotate nested expressions.
(define-syntax $gl-recur
(syntax-rules ()
((_ (item ...))
(list ($gl item) ...))
((_ atom)
'atom)))
(define &seagull-syntax-error
(make-exception-type '&seagull-syntax-error &error '(syntax)))
(define make-seagull-syntax-error
(record-constructor &seagull-syntax-error))
(define seagull-syntax-error-syntax
(exception-accessor &seagull-syntax-error
(record-accessor &seagull-syntax-error 'syntax)))
(define (seagull-syntax-error msg syntax origin)
(raise-exception
(make-exception
(make-seagull-syntax-error syntax)
(make-exception-with-origin origin)
(make-exception-with-message
(format #f "Syntax error at ~a: ~a"
(sourcev->string (seagull-syntax-source syntax))
msg))
(make-exception-with-irritants (list (seagull-syntax->sexp syntax))))))
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