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;;; lout.scm -- Lout implementation of the `eq' package.
;;;
;;; Copyright 2005, 2006 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program 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 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.
(define-module (skribilo package eq lout)
:use-module (skribilo package eq)
:use-module (skribilo ast)
:autoload (skribilo output) (output)
:use-module (skribilo writer)
:use-module (skribilo engine)
:use-module (skribilo lib)
:use-module (skribilo utils syntax)
:use-module (skribilo utils keywords) ;; `the-options', etc.
:use-module (ice-9 optargs))
(fluid-set! current-reader %skribilo-module-reader)
;;;
;;; Initialization.
;;;
(when-engine-is-instantiated (lookup-engine-class 'lout)
(lambda (lout class)
(let ((includes (engine-custom lout 'includes)))
;; Append the `eq' include file
(engine-custom-set! lout 'includes
(string-append includes "\n"
"@SysInclude { eq }\n")))))
;;;
;;; Simple markup writers.
;;;
(markup-writer 'eq-display (lookup-engine-class 'lout)
:before "\n@BeginAlignedDisplays\n"
:after "\n@EndAlignedDisplays\n")
(markup-writer 'eq (lookup-engine-class 'lout)
:options '(:inline? :align-with :div-style :mul-style)
:before (lambda (node engine)
(let* ((parent (ast-parent node))
(displayed? (is-markup? parent 'eq-display)))
(format #t "~a{ "
(if (and displayed? (not (*embedded-renderer*)))
"\n@IAD " ""))))
:action (lambda (node engine)
(display (if (inline-equation? node)
"@E { "
"@Eq { "))
(let ((eq (markup-body node)))
;;(fprint (current-error-port) "eq=" eq)
(output eq engine)))
:after " } }")
;; Scaled parenthesis. We could use `pmatrix' here but it precludes
;; line-breaking within equations.
(define %left-paren "{ Base @Font @VScale \"(\" }")
(define %right-paren "{ Base @Font @VScale \")\" }")
(define (div-style->lout style)
(case style
((over) "over")
((fraction) "frac")
((div) "div")
((slash) "slash")
(else
(error "unsupported div style" style))))
(define (mul-style->lout style)
(case style
((space) "")
((cross) "times")
((asterisk) "*")
((dot) "cdot")
(else
(error "unsupported mul style" style))))
(define-macro (simple-lout-markup-writer sym . args)
(let* ((lout-name (if (null? args)
(symbol->string sym)
(car args)))
(parentheses? (if (or (null? args) (null? (cdr args)))
#t
(cadr args)))
(precedence (operator-precedence sym))
(open-par (if parentheses?
`(if need-paren? %left-paren "")
""))
(close-par (if parentheses?
`(if need-paren? %right-paren "")
"")))
`(markup-writer ',(symbol-append 'eq: sym)
(lookup-engine-class 'lout)
:action (lambda (node engine)
(let* ((lout-name ,(if (string? lout-name)
lout-name
`(,lout-name node
engine)))
(eq (ast-parent node))
(eq-parent (ast-parent eq)))
(let loop ((operands (markup-body node))
(first? #t))
(if (null? operands)
#t
(let* ((align?
(and first?
(is-markup? eq-parent 'eq-display)
(eq? ',sym
(markup-option eq :align-with))))
(op (car operands))
(eq-op? (equation-markup? op))
(need-paren?
(and eq-op?
(>= (operator-precedence
(equation-markup-name->operator
(markup-markup op)))
,precedence)))
(column (port-column (current-output-port))))
;; Work around Lout's limitations...
(if (> column 1000) (display "\n"))
(display (string-append " { " ,open-par))
(output op engine)
(display (string-append ,close-par " }"))
(if (pair? (cdr operands))
(display (string-append " "
(if align? "^" "")
lout-name
" ")))
(loop (cdr operands) #f)))))))))
;; `+' and `*' have higher precedence than `-', `/', `=', etc., so their
;; operands do not need to be enclosed in parentheses. OTOH, since we use a
;; horizontal bar of `/', we don't need to parenthesize its arguments.
(simple-lout-markup-writer +)
(simple-lout-markup-writer - "-")
(simple-lout-markup-writer *
(lambda (n e)
;; Obey either the per-node `:mul-style' or the
;; top-level one.
(mul-style->lout
(or (markup-option n :mul-style)
(let ((eq (ast-parent n)))
(markup-option eq :mul-style))))))
(simple-lout-markup-writer /
(lambda (n e)
;; Obey either the per-node `:div-style' or the
;; top-level one.
(div-style->lout
(or (markup-option n :div-style)
(let ((eq (ast-parent n)))
(markup-option eq :div-style)))))
#f)
(simple-lout-markup-writer =)
(simple-lout-markup-writer <)
(simple-lout-markup-writer >)
(simple-lout-markup-writer <=)
(simple-lout-markup-writer >=)
(define-macro (binary-lout-markup-writer sym lout-name)
`(markup-writer ',(symbol-append 'eq: sym) (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((body (markup-body node)))
(if (= (length body) 2)
(let* ((first (car body))
(second (cadr body))
(parentheses? (equation-markup? first)))
(display " { { ")
(if parentheses? (display %left-paren))
(output first engine)
(if parentheses? (display %right-paren))
(display ,(string-append " } " lout-name " { "))
(output second engine)
(display " } } "))
(skribe-error ,(symbol-append 'eq: sym)
"wrong number of arguments"
body))))))
(binary-lout-markup-writer expt "sup")
(binary-lout-markup-writer in "element")
(binary-lout-markup-writer notin "notelement")
(markup-writer 'eq:apply (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((func (car (markup-body node))))
(output func engine)
(display %left-paren)
(let loop ((operands (cdr (markup-body node))))
(if (null? operands)
#t
(begin
(output (car operands) engine)
(if (not (null? (cdr operands)))
(display ", "))
(loop (cdr operands)))))
(display %right-paren))))
(markup-writer 'eq:limit (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((body (markup-body node))
(var (markup-option node :var))
(limit (markup-option node :limit)))
(display "{ lim from { ")
(output var engine)
(display " --> ")
(output limit engine)
(display (string-append " } } @VContract { " %left-paren))
(output body engine)
(display (string-append %right-paren " } ")))))
(markup-writer 'eq:combinations (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((of (markup-option node :of))
(among (markup-option node :among)))
(display " ` { matrix atleft { lpar } atright { rpar } { ")
(display "row col { ")
(output of engine)
(display " } row col { ")
(output among engine)
(display " } } } `\n"))))
;;;
;;; Sums, products, integrals, etc.
;;;
(define-macro (range-lout-markup-writer sym lout-name)
`(markup-writer ',(symbol-append 'eq: sym) (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((from (markup-option node :from))
(to (markup-option node :to))
(body (markup-body node)))
(display ,(string-append " { big " lout-name
" from { "))
(output from engine)
(display " } to { ")
(output to engine)
(display " } { ")
(output body engine)
(display " } } ")))))
(range-lout-markup-writer sum "sum")
(range-lout-markup-writer product "prod")
(markup-writer 'eq:script (lookup-engine-class 'lout)
:action (lambda (node engine)
(let ((body (markup-body node))
(sup (markup-option node :sup))
(sub (markup-option node :sub)))
(display " { { ")
(output body engine)
(display " } ")
(if sup
(begin
(display (if sub " supp { " " sup { "))
(output sup engine)
(display " } ")))
(if sub
(begin
(display (if sup " on { " " sub { "))
(output sub engine)
(display " } ")))
(display " } "))))
;;; arch-tag: 2a1410e5-977e-4600-b781-3d57f4409b35
|
