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;;; guile-aws --- Scheme DSL for the AWS APIs
;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; Guile-AWS is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published
;;; by the Free Software Foundation, either version 3 of the License,
;;; or (at your option) any later version.
;;;
;;; Guile-AWS 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (language aws spec)
#:use-module (aws base)
#:use-module (aws utils json)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-2)
#:use-module (system base language)
#:export (aws))
(define %shape-specs (list))
(define (primitive? exp)
(member (assoc-ref exp "type")
'("string"
"blob"
"boolean"
"timestamp"
"integer" "long"
"double" "float"
"list")))
(define (primitive-type-checker exp)
"Return an S-expression representation of a type checking procedure
for a shape expression EXP with a primitive data type. Throw an error
if this is not a primitive data type."
(match (assoc-ref exp "type")
("string"
(let ((enum (and=> (assoc-ref exp "enum")
vector->list))
(min (assoc-ref exp "min"))
(max (assoc-ref exp "max")))
`(lambda (value)
(and (string? value)
,(if enum
`(member value ',enum)
#true)
,(if (or min max)
`(let ((len (string-length value)))
(and ,(if min `(>= len ,min) #true)
,(if max `(<= len ,max) #true)))
#true)))))
("blob" 'bytevector?)
("boolean" 'boolean?)
("timestamp" 'date?)
((or "integer" "long")
`(lambda (value)
(let ((min ,(assoc-ref exp "min"))
(max ,(assoc-ref exp "max")))
(and (integer? value)
(if min (>= value min) #t)
(if max (<= value max) #t)))))
((or "double" "float") 'real?)
("list"
(let ((member-spec (assoc-ref exp "member")))
(if member-spec
`(lambda (value)
(let ((shape ',(string->symbol (assoc-ref member-spec "shape"))))
(and (list? value)
(every (lambda (item)
(and=> (aws-name item)
(cut eq? <> shape)))
value))))
'list?)))
("map"
`(lambda (value)
(let ((key-shape
',(string->symbol (assoc-ref (assoc-ref exp "key") "shape")))
(value-shape
',(string->symbol (assoc-ref (assoc-ref exp "value") "shape"))))
(and (list? value)
(every (match-lambda
((key . value)
(and (and=> (aws-name key)
(cut eq? <> key-shape))
(and=> (aws-name value)
(cut eq? <> value-shape))))
(_ #f))
value)))))
;; Not a primitive type.
(unknown
(error (format #f "unknown primitive type: ~a~%" unknown)))))
(define (compile-member-args members required)
(append-map (match-lambda
((name . spec)
(let ((slot-name (string->symbol name)))
(if (member name required)
`((,slot-name
(error (format #f "~a: required value missing."
,name))))
(list (list slot-name ''__unspecified__))))))
members))
(define (compile-shape-stubs exp)
"Compile an AWS shape expression EXP to a stub."
(match exp
((name . spec)
;; Record shape spec for later type checking
(set! %shape-specs
(acons (string->symbol name)
(alist-delete "documentation" spec)
%shape-specs))
`(define ,(string->symbol name) #f))))
(define (compile-shape exp)
"Compile an AWS shape expression EXP."
(define required
(or (and=> (assoc-ref exp "required") vector->list)
'()))
(define members (assoc-ref exp "members"))
(define structure? (string=? (assoc-ref exp "type") "structure"))
(match exp
((name . spec)
(let ((scm-name (string->symbol name)))
(if structure?
`(begin
(define ,scm-name
(lambda* (#:key ,@(compile-member-args members required))
,(assoc-ref spec "documentation")
;; Type checks
,@(map (match-lambda
((name . spec)
(let ((key-name (string->symbol name)))
`(unless (eq? ,key-name '__unspecified__)
(ensure ,key-name
',(string->symbol (assoc-ref spec "shape")))))))
members)
(aws-structure
',scm-name
(list ,@(map (match-lambda
((name . spec)
`(aws-member #:name ',(string->symbol name)
#:shape ',(and=> (assoc-ref spec "shape") string->symbol)
#:location ,(assoc-ref spec "location")
#:location-name ,(assoc-ref spec "locationName")
#:documentation ,(assoc-ref spec "documentation")
#:value ,(string->symbol name))))
members)))))
(export ,scm-name))
`(begin
(define ,scm-name
(aws-shape #:aws-name ',scm-name
#:primitive?
,(and (primitive?
(alist-delete "documentation" spec)) #t)
#:type-checker
,(primitive-type-checker
(alist-delete "documentation" spec))
#:location
',(and=> (assoc-ref spec "location") string->symbol)
#:location-name
,(assoc-ref spec "locationName")
#:documentation
,(assoc-ref spec "documentation")))
(export ,scm-name)))))))
(define (compile-operation exp)
"Compile an AWS operation expression EXP."
(match exp
((name . spec)
`(begin
(define ,(string->symbol name)
(aws-operation
operation->request
#:name ,name
#:input-type
',(and=> (assoc-ref spec "input")
(lambda (input)
(and=> (assoc-ref input "shape") string->symbol)))
#:output-type
',(and=> (assoc-ref spec "output")
(lambda (output)
(and=> (assoc-ref output "shape") string->symbol)))
#:http
;; This includes things like "method", "requestUri", and "responseCode"
',(assoc-ref spec "http")
#:documentation
,(assoc-ref spec "documentation")))
(export ,(string->symbol name))))))
(define (compile-scheme exp env opts)
(and-let* ((meta (assoc-ref exp "metadata"))
(module-name (string->symbol (assoc-ref meta "uid"))))
(values `(begin
(define-module (aws api ,module-name)
#:use-module (aws base)
#:use-module (aws request)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module ((srfi srfi-19) #:select (date?))
#:use-module (srfi srfi-26)
#:use-module ((rnrs bytevectors) #:select (bytevector?)))
(define-public api-documentation
,(assoc-ref exp "documentation"))
(define api-metadata
',(map (lambda (key)
`(,(string->symbol key) . ,(assoc-ref meta key)))
(map car meta)))
(define operation->request
(make-operation->request api-metadata))
;; Define all shapes first so that we don't have to do
;; a topological sort. In the next step the shapes are
;; redefined.
,@(map compile-shape-stubs (assoc-ref exp "shapes"))
,@(map compile-shape (assoc-ref exp "shapes"))
,@(map compile-operation (assoc-ref exp "operations")))
env env)))
(define-language aws
#:title "AWS JSON specification language"
#:reader (lambda (port env)
(if (eof-object? (peek-char port))
(read-char port)
(read-json port)))
#:compilers `((scheme . ,compile-scheme))
#:printer write)
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