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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.
;; The base intermediate language for Seagull, before it is converted
;; to continuation-passing style. No static type checking at this
;; level. Analogous to Guile's Tree-IL.
(define-module (chickadee graphics seagull base)
#:use-module (chickadee graphics seagull utils)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:export (<constant>
make-constant
constant?
constant-source
constant-value
<lexical-reference>
make-lexical-reference
lexical-reference?
lexical-reference-source
lexical-reference-source-name
lexical-reference-name
<struct-reference>
make-struct-reference
struct-reference?
struct-reference-source
struct-reference-value
struct-reference-field
<array-reference>
make-array-reference
array-reference?
array-reference-source
array-reference-value
array-reference-index
<assignment>
make-assignment
assignment?
assignment-source
assignment-source-name
assignment-name
assignment-value
<values>
make-values
values?
values-source
values-expressions
<sequence>
make-sequence
sequence?
sequence-source
sequence-expressions
<let>
make-let
let?
let-source
let-source-names
let-names
let-expressions
let-body
<let-values>
make-let-values
let-values?
let-values-source
let-values-source-names
let-values-names
let-values-expressions
let-values-body
<conditional>
make-conditional
conditional?
conditional-source
conditional-predicate
conditional-consequent
conditional-alternate
<function>
make-function
function?
function-source
function-source-names
function-names
function-body
<primitive-call>
make-primitive-call
primitive-call?
primitive-call-source
primitive-call-name
primitive-call-arguments
<call>
make-call
call?
call-source
call-function
call-arguments
<discard>
make-discard
discard?
discard-source
base->sexp
sexp->base))
(define-record-type <constant>
(make-constant source value)
constant?
(source constant-source)
(value constant-value))
(define-record-type <lexical-reference>
(make-lexical-reference source source-name name)
lexical-reference?
(source lexical-reference-source)
(source-name lexical-reference-source-name)
(name lexical-reference-name))
(define-record-type <struct-reference>
(make-struct-reference source value field)
struct-reference?
(source struct-reference-source)
(value struct-reference-value)
(field struct-reference-field))
(define-record-type <array-reference>
(make-array-reference source value index)
array-reference?
(source array-reference-source)
(value array-reference-value)
(index array-reference-index))
(define-record-type <assignment>
(make-assignment source source-name name value)
assignment?
(source assignment-source)
(source-name assignment-source-name)
(name assignment-name)
(value assignment-value))
(define-record-type <values>
(make-values source expressions)
values?
(source values-source)
(expressions values-expressions))
(define-record-type <sequence>
(make-sequence source expressions)
sequence?
(source sequence-source)
(expressions sequence-expressions))
(define-record-type <let>
(make-let source source-names names expressions body)
let?
(source let-source)
(source-names let-source-names)
(names let-names)
(expressions let-expressions)
(body let-body))
(define-record-type <let-values>
(make-let-values source source-names names expressions body)
let-values?
(source let-values-source)
(source-names let-values-source-names)
(names let-values-names)
(expressions let-values-expressions)
(body let-values-body))
(define-record-type <conditional>
(make-conditional source predicate consequent alternate)
conditional?
(source conditional-source)
(predicate conditional-predicate)
(consequent conditional-consequent)
(alternate conditional-alternate))
(define-record-type <function>
(make-function source source-names names body)
function?
(source function-source)
(source-names function-source-names)
(names function-names)
(body function-body))
(define-record-type <primitive-call>
(make-primitive-call source name arguments)
primitive-call?
(source primitive-call-source)
(name primitive-call-name)
(arguments primitive-call-arguments))
(define-record-type <call>
(make-call source function arguments)
call?
(source call-source)
(function call-function)
(arguments call-arguments))
(define-record-type <discard>
(make-discard source)
discard?
(source discard-source))
(define (base->sexp exp)
(match exp
(($ <constant> _ value)
`(constant ,value))
(($ <lexical-reference> _ name _)
`(lexical-reference ,name))
(($ <struct-reference> _ value field)
`(struct-reference ,(base->sexp value) ,field))
(($ <array-reference> _ value index)
`(array-reference ,(base->sexp value) ,index))
(($ <assignment> _ name _ value)
`(assignment ,name ,(base->sexp value)))
(($ <values> _ exps)
`(values ,@(map base->sexp exps)))
(($ <sequence> _ exps)
`(sequence ,@(map base->sexp exps)))
(($ <let> _ names _ exps body)
`(let ,(zip names (map base->sexp exps)) ,(base->sexp body)))
(($ <let-values> _ names _ exps body)
`(let-values ,(zip names (map base->sexp exps)) ,(base->sexp body)))
(($ <conditional> _ predicate consequent alternate)
`(conditional ,(base->sexp predicate)
,(base->sexp consequent)
,(base->sexp alternate)))
(($ <function> _ names _ body)
`(function ,names ,(base->sexp body)))
(($ <primitive-call> _ op args)
`(primitive-call ,op ,@(map base->sexp args)))
(($ <call> _ function args)
`(call ,(base->sexp function) ,@(map base->sexp args)))
(($ <discard> _)
'(discard))))
;; Useful for tests.
(define (sexp->base exp)
(match exp
(('constant value)
(make-constant #f value))
(('lexical-reference (? symbol? name))
(make-lexical-reference #f name name))
(('struct-reference value (? symbol? field))
(make-struct-reference #f (sexp->base value) field))
(('array-reference value index)
(make-array-reference #f (sexp->base value) (sexp->base index)))
(('assignment (? symbol? name) value)
(make-assignment #f name name (sexp->base value)))
(('values exps ...)
(make-values #f (map sexp->base exps)))
(('sequence exps ...)
(make-sequence #f (map sexp->base exps)))
(('let ((names exps) ...) body)
(make-let #f names names (map sexp->base exps) (sexp->base body)))
(('let-values (((names ...) exps) ...) body)
(make-let-values #f names names (map sexp->base exps) (sexp->base body)))
(('conditional predicate consequent alternate)
(make-conditional #f
(sexp->base predicate)
(sexp->base consequent)
(sexp->base alternate)))
(('function (names ...) body)
(make-function #f names names (sexp->base body)))
(('primitive-call (? symbol? op) args ...)
(make-primitive-call #f op (map sexp->base args)))
(('call function args ...)
(make-call #f (sexp->base function) (map sexp->base args)))
(('discard)
(make-discard #f))))
(define (print-base exp port)
(format port "#<base ~a>" (base->sexp exp)))
(set-record-type-printer! <constant> print-base)
(set-record-type-printer! <lexical-reference> print-base)
(set-record-type-printer! <struct-reference> print-base)
(set-record-type-printer! <array-reference> print-base)
(set-record-type-printer! <assignment> print-base)
(set-record-type-printer! <values> print-base)
(set-record-type-printer! <sequence> print-base)
(set-record-type-printer! <let> print-base)
(set-record-type-printer! <let-values> print-base)
(set-record-type-printer! <conditional> print-base)
(set-record-type-printer! <function> print-base)
(set-record-type-printer! <primitive-call> print-base)
(set-record-type-printer! <call> print-base)
(set-record-type-printer! <discard> print-base)
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