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;;; eval.scm -- Skribilo evaluator.
;;;
;;; Copyright 2005, 2006, 2009, 2012, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo 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.
;;;
;;; Skribilo 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 Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo evaluator)
#:export (evaluate-ast-from-port
evaluate-document evaluate-document-from-port
load-document include-document *load-options*)
#:autoload (skribilo parameters) (*verbose* *document-path*)
#:use-module (skribilo engine)
#:autoload (skribilo reader) (*document-reader*)
#:autoload (skribilo verify) (verify)
#:autoload (skribilo resolve) (resolve!)
#:autoload (skribilo module) (*skribilo-user-module*))
(use-modules (skribilo utils syntax)
(skribilo condition)
(skribilo debug)
(skribilo output)
(skribilo lib)
(ice-9 optargs)
(srfi srfi-1)
(srfi srfi-13)
(srfi srfi-34)
(srfi srfi-35)
(srfi srfi-39))
(skribilo-module-syntax)
;;;
;;; %EVALUATE
;;;
(define (%evaluate expr module)
;; Evaluate EXPR in the current module. EXPR is an arbitrary S-expression
;; that may contain calls to the markup functions defined in a markup
;; package such as `(skribilo package base)', e.g., `(bold "hello")'.
(eval expr module))
;;;
;;; EVALUATE-AST-FROM-PORT
;;;
(define* (evaluate-ast-from-port port :key (reader (*document-reader*))
(module (*skribilo-user-module*)))
;; Evaluate code from PORT in MODULE, reading it with READER, and return an
;; AST (resulting from the last form evaluated). The returned AST is
;; unresolved and unverified.
(save-module-excursion
(lambda ()
(with-debug 10 'evaluate-ast-from-port
(set-current-module module)
(let loop ((exp (reader port))
(result #f))
(debug-item "exp=" exp)
(if (eof-object? exp)
result
(loop (reader port)
(%evaluate exp (current-module)))))))))
;;;
;;; EVALUATE-DOCUMENT
;;;
(define* (evaluate-document a e :key (env '()))
;; Argument A must denote an AST of something like that, not just an
;; S-exp.
(with-debug 2 'evaluate-document
(debug-item "a=" a " e=" (engine-ident e))
(let ((a2 (resolve! a e env)))
(debug-item "resolved a=" a)
(let ((a3 (verify a2 e)))
(debug-item "verified a=" a3)
(output a3 e)))))
;;;
;;; EVALUATE-DOCUMENT-FROM-PORT
;;;
(define* (evaluate-document-from-port port engine
:key (env '())
(reader (*document-reader*))
(module (*skribilo-user-module*)))
(with-debug 2 'evaluate-document-from-port
(debug-item "engine=" engine)
(debug-item "reader=" reader)
(let ((e (if (symbol? engine) (lookup-engine engine) engine)))
(debug-item "e=" e)
(if (not (engine? e))
(raise (condition (&invalid-argument-error
(proc-name 'evaluate-document-from-port)
(argument e))))
(let ((ast (evaluate-ast-from-port port :reader reader
:module module)))
(evaluate-document ast engine :env env))))))
;;;
;;; LOAD-DOCUMENT
;;;
;; Options that may make sense to a specific back-end or package.
(define-public *load-options* (make-parameter '()))
;; List of the names of files already loaded.
(define *loaded-files* (make-parameter '()))
(define* (load-document file
:key engine path
(module (*skribilo-user-module*))
(reader (*document-reader*))
:allow-other-keys
:rest opt)
(with-debug 4 'load-document
(debug-item " engine=" engine)
(debug-item " path=" path)
(debug-item " opt=" opt)
(let* ((ei (*current-engine*))
(path (append (cond
((not path) (*document-path*))
((string? path) (list path))
((not (and (list? path) (every string? path)))
(raise (condition (&invalid-argument-error
(proc-name 'load-document)
(argument path)))))
(else path))
%load-path))
(filep (search-path path file)))
(unless (and (string? filep) (file-exists? filep))
(raise (condition (&file-search-error
(file-name file)
(path path)))))
;; Pass the additional options to the back-end and/or packages being
;; used.
(parameterize ((*load-options* opt))
;; Load this file if not already done
;; FIXME: Shouldn't we remove this logic? -- Ludo'.
(unless (member filep (*loaded-files*))
(cond
((> (*verbose*) 1)
(format (current-error-port) " [loading file: ~S ~S]\n" filep opt))
((> (*verbose*) 0)
(format (current-error-port) " [loading file: ~S]\n" filep)))
;; Load it
(with-input-from-file filep
(lambda ()
(set-correct-file-encoding!)
(evaluate-document-from-port (current-input-port) ei
:module module
:reader reader)))
(*loaded-files* (cons filep (*loaded-files*))))))))
;;;
;;; INCLUDE-DOCUMENT
;;;
(define* (include-document file :key (path (*document-path*))
(reader (*document-reader*))
(module (current-module)))
(unless (every string? path)
(raise (condition (&invalid-argument-error (proc-name 'include-document)
(argument path)))))
(let ((full-path (search-path path file)))
(unless (and (string? full-path) (file-exists? full-path))
(raise (condition (&file-search-error
(file-name file)
(path path)))))
(when (> (*verbose*) 0)
(format (current-error-port) " [including file: ~S]\n" full-path))
(with-input-from-file full-path
(lambda ()
(set-correct-file-encoding!)
(save-module-excursion
(lambda ()
(set-current-module module)
(let Loop ((exp (reader (current-input-port)))
(res '()))
(if (eof-object? exp)
(if (and (pair? res) (null? (cdr res)))
(car res)
(reverse! res))
(Loop (reader (current-input-port))
(cons (%evaluate exp module) res))))))))))
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