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- ;;; Mudsync --- Live hackable MUD
- ;;; Copyright © 2017 Christine Lemmer-Webber <cwebber@dustycloud.org>
- ;;;
- ;;; This file is part of Mudsync.
- ;;;
- ;;; Mudsync 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.
- ;;;
- ;;; Mudsync 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 Mudsync. If not, see <http://www.gnu.org/licenses/>.
- ;;; SCRUBL: S-exps Craftily/Crappily Rendering Underlying Basic Language
- ;;; a micro-"skribe-like" system (kinda ugly tho)
- ;;; Turns quasiquoted structures into something rendered.
- ;;;
- ;;; This is an immutable interface but it does use mutation under the
- ;;; hood for expediency.
- ;;; To make a new scrubl that extends an existing scrubl, use the exported
- ;;; scrubl-extend-fields.
- (define-module (mudsync scrubl)
- #:use-module (ice-9 match)
- #:use-module (srfi srfi-9)
- #:use-module (sxml simple)
- #:use-module (oop goops)
- #:use-module (ice-9 vlist)
- #:use-module (ice-9 vlist)
- #:use-module (ice-9 hash-table)
- #:use-module (web uri)
- #:export (make-scrubl
- scrubl? scrubl-extend-fields
- scrubl-write
- scrubl-sxml scrubl-sxml-simple-field))
- (define (order-symlist-args symlist-args)
- "Orders the args in a symlist so keyword pairs are at the end"
- (define new-args
- (let lp ((remaining symlist-args)
- (args '())
- (kwargs '()))
- (match remaining
- ('() (cons (reverse args)
- kwargs))
- (((? keyword? kw) val rest ...)
- (lp rest
- args
- (cons* kw val kwargs)))
- ((arg rest ...)
- (lp rest
- (cons arg args)
- kwargs)))))
- new-args)
- (define-record-type <scrubl>
- (%make-scrubl field-writers meta-write)
- scrubl?
- (field-writers scrubl-field-writers)
- (meta-write scrubl-meta-write))
- (define (make-scrubl field-writers meta-write)
- (%make-scrubl (alist->hashq-table field-writers)
- meta-write))
- (define (scrubl-extend-fields scrubl new-field-writers)
- "Returns a new <scrubl> instance extending SCRUBL's field-writers with
- NEW-FIELD-WRITERS."
- (define new-writers
- (let ((new-table (make-hash-table)))
- ;; Add old fields from hashq
- (hash-for-each
- (lambda (key val)
- (hashq-set! new-table key val))
- (scrubl-field-writers scrubl))
- ;; Now add the new fields
- (for-each
- (match-lambda
- ((key . val)
- (hashq-set! new-table key val)))
- new-field-writers)
- new-table))
- (%make-scrubl new-writers (scrubl-meta-write scrubl)))
- (define (scrubl-write scrubl obj . args)
- "Write out OBJ via SCRUBL
- Pass in optional extra ARGS to the main META-WRITE"
- (apply (scrubl-meta-write scrubl) scrubl obj args))
- (define* (scrubl-write-obj scrubl obj)
- (match obj
- (((? symbol? sym) args ...)
- (let* ((field-writers (scrubl-field-writers scrubl))
- (field-writer (hashq-ref field-writers sym))
- (ordered-args (order-symlist-args args)))
- (when (not field-writer)
- (throw 'scrubl-unknown-field
- #:field sym
- #:args args))
- (apply field-writer scrubl ordered-args)))
- ((items ...)
- (map (lambda (item)
- (scrubl-write-obj scrubl item))
- items))
- (any-obj any-obj)))
- ;;; SXML scrubl writer
- (define (scrubl-sxml-write scrubl obj)
- (call-with-output-string
- (lambda (p)
- (sxml->xml
- (scrubl-write-obj scrubl obj)
- p))))
- (define (scrubl-sxml-simple-field sym)
- (lambda (scrubl args)
- ;; sxml handles inlining automatically in case we have nested
- ;; lists of strings, so we don't have to worry about that...
- (cons sym (map (lambda (arg)
- (scrubl-write-obj scrubl arg))
- args))))
- (define (scrubl-sxml-pre scrubl args)
- `(span (@ (class "pre-ish"))
- ,args))
- ;; @@: For a text-only interface, we could put links at end of rendered
- ;; text, similar to how orgmode does.
- (define (scrubl-sxml-anchor scrubl args)
- (define (maybe-uri->string obj)
- (if (uri? obj)
- (uri->string obj)
- obj))
- (match args
- (((= maybe-uri->string href) body1 body ...)
- `(a (@ (href ,href))
- ,body1 ,@body))))
- (define scrubl-sxml
- (make-scrubl `((p . ,(scrubl-sxml-simple-field 'p))
- (strong . ,(scrubl-sxml-simple-field 'strong))
- (bold . ,(scrubl-sxml-simple-field 'strong))
- (b . ,(scrubl-sxml-simple-field 'strong))
- (em . ,(scrubl-sxml-simple-field 'em))
- (i . ,(scrubl-sxml-simple-field 'em))
- (br . ,(scrubl-sxml-simple-field 'br))
- (anchor . ,scrubl-sxml-anchor)
- (a . ,scrubl-sxml-anchor)
- (pre . ,scrubl-sxml-pre) ;; "pre" style whitespace handling.
- (ul . ,(scrubl-sxml-simple-field 'ul))
- (li . ,(scrubl-sxml-simple-field 'li)))
- scrubl-sxml-write))
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