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|
;;; resolve.scm -- Skribilo reference resolution.
;;;
;;; Copyright 2005, 2006, 2008, 2009, 2018 Ludovic Court�s <ludo@gnu.org>
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.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 resolve)
:use-module (skribilo debug)
:use-module (skribilo ast)
:use-module (skribilo utils syntax)
:use-module (oop goops)
:use-module (srfi srfi-39)
:use-module (skribilo condition)
:use-module (srfi srfi-34)
:use-module (srfi srfi-35)
:use-module (ice-9 match)
:export (resolve! resolve-search-parent
resolve-counter resolve-parent resolve-ident
*document-being-resolved*))
(skribilo-module-syntax)
;;;
;;; Resolving nodes.
;;;
;; The document being resolved. Note: This is only meant to be used by the
;; compatibility layer in order to implement things like `find-markups'!
(define *document-being-resolved* (make-parameter #f))
(define *unresolved* (make-parameter #f))
(define-generic do-resolve!)
;;;; ======================================================================
;;;;
;;;; RESOLVE!
;;;;
;;;; This function iterates over an ast until all unresolved references
;;;; are resolved.
;;;;
;;;; ======================================================================
(define (resolve! ast engine env)
(with-debug 3 'resolve
(debug-item "ast=" ast)
(if (document? ast)
;; Bind nodes prior to resolution so that unresolved nodes can
;; lookup nodes by identifier using `document-lookup-node' or
;; `resolve-ident'.
(document-bind-nodes! ast))
(parameterize ((*unresolved* #f))
(let Loop ((ast ast))
(*unresolved* #f)
(let ((ast (do-resolve! ast engine env)))
(if (*unresolved*)
(begin
(debug-item "iterating over ast " ast)
(Loop ast))
ast))))))
;;;; ======================================================================
;;;;
;;;; D O - R E S O L V E !
;;;;
;;;; ======================================================================
(define-method (do-resolve! ast engine env)
ast)
(define-method (do-resolve! (ast <pair>) engine env)
(match ast
((? list?) ;proper list
(map (lambda (elt)
(do-resolve! elt engine env))
ast))
((head . tail) ;pair or improper list
(cons (do-resolve! head engine env)
(do-resolve! tail engine env)))))
(define-method (do-resolve! (node <node>) engine env)
(if (ast-resolved? node)
node
(let ((body (slot-ref node 'body))
(options (slot-ref node 'options))
(parent (slot-ref node 'parent))
(unresolved? (*unresolved*)))
(with-debug 5 'do-resolve<body>
(debug-item "body=" body)
(parameterize ((*unresolved* #f))
(when (eq? parent 'unspecified)
(let ((p (assq 'parent env)))
(slot-set! node 'parent
(and (pair? p) (pair? (cdr p)) (cadr p)))))
(when (pair? options)
(debug-item "unresolved options=" options)
(let ((resolved (map (match-lambda
((option value)
(list option
(do-resolve! value engine env))))
options)))
(slot-set! node 'options resolved)
(debug-item "resolved options=" options)))
(slot-set! node 'body (do-resolve! body engine env))
(slot-set! node 'resolved? (not (*unresolved*))))
(*unresolved* (or unresolved? (not (ast-resolved? node))))
node))))
(define-method (do-resolve! (node <container>) engine env0)
;; Similar to the NODE method, except that (i) children will get NODE as
;; their parent, and (ii) NODE may extend its environment, through its
;; `env' slot.
(if (ast-resolved? node)
node
(let ((body (slot-ref node 'body))
(options (slot-ref node 'options))
(env (slot-ref node 'env))
(parent (slot-ref node 'parent))
(unresolved? (*unresolved*)))
(with-debug 5 'do-resolve<container>
(debug-item "markup=" (markup-markup node))
(debug-item "body=" body)
(debug-item "env0=" env0)
(debug-item "env=" env)
(parameterize ((*unresolved* #f))
(when (eq? parent 'unspecified)
(let ((p (assq 'parent env0)))
(slot-set! node 'parent
(and (pair? p) (pair? (cdr p)) (cadr p)))))
(when (pair? options)
(let ((e (append `((parent ,node)) env0)))
(debug-item "unresolved options=" options)
(for-each (lambda (o)
(set-car! (cdr o)
(do-resolve! (cadr o)
engine e)))
options)
(debug-item "resolved options=" options)))
(let ((e `((parent ,node) ,@env ,@env0)))
(slot-set! node 'body (do-resolve! body engine e)))
(slot-set! node 'resolved? (not (*unresolved*))))
(*unresolved* (or unresolved? (not (ast-resolved? node))))
node))))
(define-method (do-resolve! (node <document>) engine env0)
(parameterize ((*document-being-resolved* node))
(next-method)
;; resolve the engine custom
(let* ((env (append `((parent ,node)) env0))
(resolved (map (match-lambda
((i a)
(debug-item "custom=" i " " a)
(list i (do-resolve! a engine env))))
(slot-ref engine 'customs))))
(slot-set! engine 'customs resolved))
node))
(define-method (do-resolve! (node <unresolved>) engine env)
(with-debug 5 'do-resolve<unresolved>
(debug-item "node=" node)
(let* ((p (assq 'parent env))
(parent (and (pair? p) (pair? (cdr p)) (cadr p))))
(slot-set! node 'parent parent)
(let* ((proc (slot-ref node 'proc))
(res (proc node engine env))
(loc (ast-loc node)))
;; Bind non-unresolved children of RES now so that unresolved
;; children of RES (if any) can look them up in the next `resolve!'
;; run. (XXX: This largely duplicates `document-bind-nodes!'.)
(let loop ((node res)
(doc (ast-document node)))
(if (ast? node)
(ast-loc-set! node loc))
(cond ((document? node)
;; Bind NODE in its parent's document. This is so
;; that (i) a sub-document is bound in its parent
;; document, and (ii) a node within a sub-document
;; is bound in this sub-document.
(document-bind-node! doc node)
(loop (markup-body node) node))
((markup? node)
(document-bind-node! doc node)
(loop (markup-body node) doc))
((node? node)
(loop (node-body node) doc))
((pair? node)
(for-each (lambda (n) (loop n doc)) node))
((command? node)
(loop (command-body node) doc))))
(debug-item "res=" res)
(*unresolved* #t)
res))))
(define-method (do-resolve! (node <handle>) engine env)
node)
(define-method (do-resolve! (node <command>) engine env)
(with-debug 5 'do-resolve<command>
(debug-item "node=" node)
(let ((p (assq 'parent env)))
(slot-set! node 'parent (and (pair? p) (pair? (cdr p)) (cadr p))))
(slot-set! node 'body
(do-resolve! (command-body node) engine env))
node))
;;;; ======================================================================
;;;;
;;;; RESOLVE-PARENT
;;;;
;;;; ======================================================================
(define (resolve-parent n e)
(with-debug 5 'resolve-parent
(debug-item "n=" n)
(cond
((not (is-a? n <ast>))
(let ((c (assq 'parent e)))
(if (pair? c)
(cadr c)
n)))
((eq? (slot-ref n 'parent) 'unspecified)
(raise (condition (&ast-orphan-error (ast n)))))
(else
(slot-ref n 'parent)))))
;;;; ======================================================================
;;;;
;;;; RESOLVE-SEARCH-PARENT
;;;;
;;;; ======================================================================
(define (resolve-search-parent n e pred)
(with-debug 5 'resolve-search-parent
(debug-item "node=" n)
(debug-item "searching=" pred)
(let ((p (resolve-parent n e)))
(debug-item "parent=" p " "
(if (is-a? p <markup>) (slot-ref p 'markup) "???"))
(cond
((pred p) p)
((is-a? p <unresolved>) p)
((not p) #f)
(else (resolve-search-parent p e pred))))))
;;;; ======================================================================
;;;;
;;;; RESOLVE-COUNTER
;;;;
;;;; ======================================================================
;;FIXME: factoriser
(define (resolve-counter n e cnt val . opt)
(let ((c (assq (symbol-append cnt '-counter) e)))
(if (not (pair? c))
(if (or (null? opt) (not (car opt)) (null? e))
(raise (condition (&ast-orphan-error (ast n))))
(begin
(set-cdr! (last-pair e)
(list (list (symbol-append cnt '-counter) 0)
(list (symbol-append cnt '-env) '())))
(resolve-counter n e cnt val)))
(let* ((num (cadr c)))
(let ((c2 (assq (symbol-append cnt '-env) e)))
(set-car! (cdr c2) (cons (resolve-parent n e) (cadr c2))))
(cond
((integer? val)
(set-car! (cdr c) val)
(car val))
((not val)
val)
(else
(set-car! (cdr c) (+ 1 num))
(+ 1 num)))))))
;;;
;;; `resolve-ident'.
;;;
;;; This function kind of sucks because the document where IDENT is to be
;;; searched is not explictly passed. Thus, using `document-lookup-node' is
;;; recommended instead of using this function.
;;;
(define (resolve-ident ident markup n e)
;; Search for a node with identifier IDENT and markup type MARKUP. N is
;; typically an `<unresolved>' node and the node lookup should be performed
;; in its parent document. E is the "environment" (an alist).
(with-debug 4 'resolve-ident
(debug-item "ident=" ident)
(debug-item "markup=" markup)
(debug-item "n=" (if (markup? n) (markup-markup n) n))
(if (not (string? ident))
(raise (condition (&invalid-argument-error ;; type error
(proc-name "resolve-ident")
(argument ident))))
(let* ((doc (ast-document n))
(result (and doc (document-lookup-node doc ident))))
(if (or (not markup)
(and (markup? result) (eq? (markup-markup result) markup)))
result
#f)))))
;;; Local Variables:
;;; coding: latin-1
;;; End:
|
