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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 (lookup-engine-class 'lout)
:options '(:inline?)
:before "{ "
:action (lambda (node engine)
(display (if (markup-option node :inline?)
"@E { "
"@Eq { "))
(let ((eq (markup-body node)))
;;(fprint (current-error-port) "eq=" eq)
(output eq engine)))
:after " } }")
(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))
;; Note: We could use `pmatrix' here but it precludes line-breaking
;; within equations.
(open-par `(if need-paren? "{ @VScale ( }" ""))
(close-par `(if need-paren? "{ @VScale ) }" "")))
`(markup-writer ',(symbol-append 'eq: sym)
(lookup-engine-class 'lout)
:action (lambda (node engine)
(let loop ((operands (markup-body node)))
(if (null? operands)
#t
(let* ((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 " { "
,(if parentheses?
open-par
"")))
(output op engine)
(display (string-append ,(if parentheses?
close-par
"")
" }"))
(if (pair? (cdr operands))
(display ,(string-append " "
lout-name
" ")))
(loop (cdr operands)))))))))
;; `+' 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 * "times")
(simple-lout-markup-writer - "-")
(simple-lout-markup-writer / "over" #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 "("))
(output first engine)
(if parentheses? (display ")"))
(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 "(")
(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 ")"))))
;;;
;;; 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 " on { ")
(output sub engine)
(display " } ")))
(display " } "))))
;;; arch-tag: 2a1410e5-977e-4600-b781-3d57f4409b35
|
