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;;; guile-cloudformation --- Scheme DSL for CloudFormation templates
;;; Copyright © 2018 David Thompson <davet@gnu.org>
;;;
;;; Guile-CloudFormation 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-CloudFormation 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 cloudformation spec)
#:use-module (aws cloudformation utils)
#:use-module (aws cloudformation utils json)
#:use-module (ice-9 match)
#:use-module (ice-9 pretty-print)
#:use-module (srfi srfi-1)
#:use-module (system base language)
#:export (cloudformation))
(define (property-type-name? name)
(number? (string-index name #\.)))
(define (classify sym)
"Add < and > around SYM to form a conventional class name."
(symbol-append '< sym '>))
(define (compile-property-slots properties)
(define (update-type-string->symbol s)
(match s
("Conditional" 'conditional)
("Immutable" 'immutable)
("Mutable" 'mutable)))
(define (primitive-type-checker type)
(match type
("String" 'string?)
("Boolean" 'boolean?)
((or "Integer" "Long") 'integer?)
("Double" 'real?)
("Timestamp" 'date?)
;; TODO: deal with this
("Json" '(const #t))))
(define (type-checker pspec)
(cond
;; Primitive types
((assoc-ref pspec "PrimitiveType") =>
primitive-type-checker)
;; Primitive lists/maps
((assoc-ref pspec "PrimitiveItemType") =>
(lambda (item-type)
(match (assoc-ref pspec "Type")
("List"
`(lambda (items)
(every (lambda (item)
(type-check ,(primitive-type-checker item-type)
item))
items)))
("Map"
`(lambda (items)
(every (match-lambda
((key . value)
(and (or (string? key) (symbol? key))
(,(primitive-type-checker item-type) value)))
(_ #f))
items))))))
;; Composite lists/maps
((assoc-ref pspec "ItemType")
(match (assoc-ref pspec "Type")
("List"
'(lambda (items) (every valid? items)))
("Map"
'(lambda (items)
(every (match-lambda
((key . value)
(and (or (string? key) (symbol? key))
(valid? value)))
(_ #f))
items)))))
;; Composite types
((assoc-ref pspec "Type")
'valid?)
;; Uh oh!
(else
(error "cannot compute type checker for property specification:" pspec))))
(map (match-lambda
((pname . pspec)
(let* ((boolean? (equal? (assoc-ref pspec "PrimitiveType")
"Boolean"))
(slot-name-base (aws-string->symbol pname))
;; Make boolean property names more
;; Scheme-like by using a question mark
;; at the end.
(slot-name (if boolean?
(symbol-append slot-name-base '?)
slot-name-base)))
`(,slot-name
#:init-keyword ,(symbol->keyword slot-name)
#:accessor ,slot-name
#:cfn-property
(make <cloudformation-property>
#:documentation-url ,(assoc-ref pspec "Documentation")
#:name ,pname
#:required? ,(assoc-ref pspec "Required")
#:type-checker ,(type-checker pspec)
#:update-type ',(update-type-string->symbol
(assoc-ref pspec "UpdateType")))))))
properties))
(define (strip-namespace s)
(match (delete "" (string-split s #\:))
((_ _ x) x)
((x) x)))
(define (compile-property-type exp)
(match exp
((name . spec)
(let* ((sym (aws-string->symbol (strip-namespace name)))
(class-name (classify sym)))
`(begin
(define-class ,class-name (<cloudformation-object>)
,@(compile-property-slots (assoc-ref spec "Properties"))
#:cfn-name ,name
#:documentation-url ,(assoc-ref spec "Documentation"))
(export ,class-name
;; Export all slot getter methods.
,@(map (match-lambda
((pname . _)
(aws-string->symbol pname)))
(assoc-ref spec "Properties"))))))))
(define (compile-resource-type exp)
(define (primitive-type-string->symbol type)
(match type
;; TODO: Handle JSON in a special way?
((or "Json" "String") 'string)
("Boolean" 'boolean)
("Integer" 'integer)))
(define (compile-attributes attributes)
(if attributes
(map (match-lambda
((name . spec)
`(cons ',(aws-string->symbol name)
(make <cloudformation-attribute>
#:name ,name
#:primitive-type
',(primitive-type-string->symbol
;; TODO: Handle attribute arrays
(or (assoc-ref spec "PrimitiveType")
(assoc-ref spec "PrimitiveItemType")))))))
attributes)
'()))
(match exp
((name . spec)
(let* ((sym (aws-string->symbol
(strip-namespace name)))
(class-name (classify sym)))
`(begin
(define-class ,class-name (<cloudformation-resource>)
,@(compile-property-slots (assoc-ref spec "Properties"))
#:cfn-name ,name
#:documentation-url ,(assoc-ref spec "Documentation")
#:attributes
(list ,@(compile-attributes (assoc-ref spec "Attributes"))))
(export ,class-name
;; Export all slot getter methods.
,@(map (match-lambda
((aws-name . _)
(aws-string->symbol aws-name)))
(assoc-ref spec "Properties"))))))))
(define (compile-scheme exp env opts)
(let ((module-suffix (string->symbol (assoc-ref exp "ModuleSuffix")))
(version (assoc-ref exp "ResourceSpecificationVersion")))
(values `(begin
(define-module (aws cloudformation ,module-suffix)
#:use-module (aws cloudformation utils)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19))
,@(if version
`((define-public cloudformation-specification-version
,version))
'())
,@(map compile-property-type (assoc-ref exp "PropertyTypes"))
,@(map compile-resource-type (assoc-ref exp "ResourceTypes")))
env env)))
(define-language cloudformation
#:title "AWS Cloudformation"
#:reader (lambda (port env)
(if (eof-object? (peek-char port))
(read-char port)
(read port)))
#:compilers `((scheme . ,compile-scheme))
#:printer write)
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