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;;; Copyright 2024 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; 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-library (qklib infix rule-set)
(export rule-set
rule-set?
rule-set-infix-ref
rule-set-prefix-ref
operator
operator?
operator-symbol
operator-prefix-symbol
operator-precedence
operator-left?
operator-prefix
operator-unit
unit
unit?
unit-value
unit-inv?
prefix
prefix?
prefix-symbol
prefix-fix?)
(import (scheme base)
(scheme case-lambda)
(only (srfi 128) make-eqv-comparator))
(cond-expand
((library (srfi srfi-146 hash)) ;; for guile-srfi-146
(import (only (srfi srfi-146 hash) hashmap-ref/default hashmap-unfold)))
((library (srfi 146 hash))
(import (only (srfi 146 hash) hashmap-ref/default hashmap-unfold))))
(begin
(define-record-type <rule-set>
(make-rule-set operator-hashmap prefix-hashmap)
rule-set?
(operator-hashmap rule-set-operator-hashmap)
(prefix-hashmap rule-set-prefix-hashmap))
(define (rule-set operator-list)
(make-rule-set (list->operator-hashmap operator-list)
(list->prefix-hashmap operator-list)))
(define (list->operator-hashmap ops)
(hashmap-unfold null?
(lambda (ops)
(values (operator-symbol (car ops))
(car ops)))
cdr
ops
(make-eqv-comparator)))
(define (list->prefix-hashmap ops)
(hashmap-unfold null?
(lambda (ops)
(let ((op (car ops)))
(values (operator-prefix-symbol op)
(car ops))))
cdr
ops
(make-eqv-comparator)))
(define (rule-set-infix-ref rule-set key)
(hashmap-ref/default (rule-set-operator-hashmap rule-set) key #f))
(define (rule-set-prefix-ref rule-set key)
(hashmap-ref/default (rule-set-prefix-hashmap rule-set) key #f))
(define-record-type <operator>
(make-operator symbol precedence left? unit prefix)
operator?
(symbol operator-symbol)
(precedence operator-precedence)
(left? operator-left?)
(unit operator-unit)
(prefix operator-prefix))
(define operator
(case-lambda
((symbol)
(operator symbol 0))
((symbol precedence)
(operator symbol precedence 'left))
((symbol precedence left-or-right)
(operator symbol precedence left-or-right #f))
((symbol precedence left-or-right unit)
(operator symbol precedence left-or-right unit #f))
((symbol precedence left-or-right unit prefix)
(unless (or (eq? 'left left-or-right)
(eq? 'right left-or-right))
(error "operator: The 3rd argument must be 'left or 'right" left-or-right))
(make-operator symbol precedence (eq? 'left left-or-right) unit prefix))))
(define (operator-prefix-symbol op)
(cond ((operator-prefix op) => prefix-symbol)
(else (operator-symbol op))))
(define-record-type <prefix>
(make-prefix symbol fix?)
prefix?
(symbol prefix-symbol)
(fix? prefix-fix?))
(define prefix
(case-lambda
((symbol)
(prefix symbol #f))
((symbol fix?)
(make-prefix symbol fix?))))
(define-record-type <unit>
(make-unit value inv?)
unit?
(value unit-value)
(inv? unit-inv?))
(define unit
(case-lambda
((value) (make-unit value #f))
((value inv?) (make-unit value inv?))))))
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