* [PATCH v2 2/2] scripts: Add SRFI documentation HTML -> Texinfo snarfer.
2023-12-13 4:22 ` [PATCH v2 0/2] Add 'snarfi' guild script to convert SRFI HTML specifications to Texinfo Maxim Cournoyer
2023-12-13 4:22 ` [PATCH v2 1/2] .dir-locals: Add indentation rule for sxml-match syntax Maxim Cournoyer
@ 2023-12-13 4:22 ` Maxim Cournoyer
1 sibling, 0 replies; 3+ messages in thread
From: Maxim Cournoyer @ 2023-12-13 4:22 UTC (permalink / raw)
To: guile-devel; +Cc: mirai, Maxim Cournoyer
* module/scripts/snarfi.scm: New file.
* am/bootstrap.am (SOURCES): Register it.
* NEWS: Add news entry.
---
Changes in v2:
- Add support for HTML table -> Texinfo @multitable
- Only splice "Specification" section if necessary
- Preserve spliced section leading text instead of discarding it
- Various bug fixes
- Use SPDX/REUSE for license/copyright notices
LICENSES/LGPL-3.0-or-later.txt | 304 +++++++++++++
am/bootstrap.am | 1 +
module/scripts/snarfi.scm | 752 +++++++++++++++++++++++++++++++++
3 files changed, 1057 insertions(+)
create mode 100644 LICENSES/LGPL-3.0-or-later.txt
create mode 100644 module/scripts/snarfi.scm
diff --git a/LICENSES/LGPL-3.0-or-later.txt b/LICENSES/LGPL-3.0-or-later.txt
new file mode 100644
index 000000000..513d1c01f
--- /dev/null
+++ b/LICENSES/LGPL-3.0-or-later.txt
@@ -0,0 +1,304 @@
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+If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
+
+13. Use with the GNU Affero General Public License.
+Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
+
+14. Revised Versions of this License.
+The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program.
+
+Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version.
+
+15. Disclaimer of Warranty.
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
+
+You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/am/bootstrap.am b/am/bootstrap.am
index a71946958..8782a7a82 100644
--- a/am/bootstrap.am
+++ b/am/bootstrap.am
@@ -307,6 +307,7 @@ SOURCES = \
scripts/api-diff.scm \
scripts/read-rfc822.scm \
scripts/snarf-guile-m4-docs.scm \
+ scripts/snarfi.scm \
scripts/autofrisk.scm \
scripts/scan-api.scm \
\
diff --git a/module/scripts/snarfi.scm b/module/scripts/snarfi.scm
new file mode 100644
index 000000000..3f0f7978a
--- /dev/null
+++ b/module/scripts/snarfi.scm
@@ -0,0 +1,752 @@
+;;; snarfi --- Snarf SRFI HTML specifications into Texinfo doc
+
+;;; SPDX-FileCopyrightText: 2023 Free Software Foundation, Inc.
+;;;
+;;; SPDX-License-Identifier: LGPL-3.0-or-later
+
+;;; Author: Maxim Cournoyer <maxim.cournoyer@gmail.com>
+
+;;; Commentary:
+
+;;; Usage: guild snarfi srfi-spec.html
+
+;;; This script takes the a SRFI HTML source file as input, parses it
+;;; and processes it to output a Texinfo that can be used as a starting
+;;; point to properly document a SRFI into Guile.
+;;;
+;;; Requirements: guile-lib (for htmlprag)
+
+;;; Tested with:
+;;; - srfi-48.html
+;;; - srfi-64.html
+;;; - srfi-151.html
+;;; - srfi-160.html
+;;; - srfi-178.html
+;;; - srfi-209.html
+
+;;; Code:
+
+(define-module (scripts snarfi)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 pretty-print)
+ #:use-module (ice-9 regex)
+ #:use-module (ice-9 string-fun)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-2)
+ #:use-module (srfi srfi-9)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-69)
+ #:use-module (sxml apply-templates)
+ #:use-module (sxml fold)
+ #:use-module ((sxml xpath) #:renamer (lambda (s)
+ (if (eq? 'filter s)
+ 'xfilter
+ s)))
+ #:use-module (sxml match)
+ #:autoload (htmlprag) (html->shtml)
+ #:export (snarfi))
+
+(define %summary "Snarf SRFI HTML specifications into Texinfo doc")
+
+(define (usage)
+ "Display usage text."
+ (format #t "Usage: snarfi SRFI-SPEC.HTML
+Snarf Texinfo documentation from SRFI-SPEC.HTML, the HTML source file
+of a SRFI specification.
+
+-h, --help print this help message
+"))
+
+(define (section-of-interest? node entered?)
+ "XPath predicate to check if a h1 header is of interest.
+ENTERED? tracks whether we've already entered a section of interest."
+ (sxml-match node
+ ((h1 ,title)
+ (member title '("Abstract" "Rationale" "Specification")))
+ (,otherwise
+ entered?)))
+
+(define (find-heading-by-text text tree)
+ "Return the heading node by its TEXT."
+ (find (lambda (node)
+ (and (pair? node)
+ (member (car node) '(h1 h2 h3 h4 h5 h6))
+ (string=? text (last node))))
+ tree))
+
+(define (node->level node)
+ "Return the heading level of NODE, else #f."
+ (and-let* ((h (cond ((pair? node) (car node))
+ ((symbol? node) node)
+ (else #f)))
+ (h* (symbol->string h))
+ (m (string-match "^h([0-6])$" h*)))
+ (string->number (match:substring m 1))))
+
+(define (decrement-heading node)
+ "Decrement heading level of NODE, if a heading, else leave it untouched."
+ (sxml-match node
+ ((h2 ,value)
+ `(h1 ,value))
+ ((h3 ,value)
+ `(h2 ,value))
+ ((h4 ,value)
+ `(h3 ,value))
+ ((h5 ,value)
+ `(h4 ,value))
+ ((h6 ,value)
+ `(h5 ,value))
+ (,other other)))
+
+(define (section->children-max-depth heading tree)
+ "Return the maximum depth of children sections found in HEADING."
+ (unless (pair? heading)
+ (error "heading must be a pair, e.g. '(h1 \"Title\")"))
+
+ (define heading-level (node->level heading))
+
+ (let loop ((depth 0)
+ (rest tree)
+ (entered? #f))
+ (match rest
+ (() depth)
+ ((node . tail)
+ (let* ((level (node->level node))
+ (at-section? (equal? heading node))
+ (leaving-section? (and entered?
+ (and level (<= level heading-level)))))
+ (loop (if (and level (> level depth))
+ level
+ depth)
+ (if leaving-section?
+ '() ;done
+ tail)
+ (if entered?
+ (not leaving-section?) ;leave section?
+ at-section?)))))))
+
+(define (splice-children heading tree)
+ "Discard any HEADING section a symbol like e.g. 'h1' or '(h2 \"Some
+Section\"), promoting its children sections in its place."
+ (unless (or (pair? heading)
+ (symbol? heading))
+ (error "heading must be a symbol or a pair"))
+
+ (define heading-level (node->level heading))
+
+ (let loop ((result '())
+ (rest tree)
+ (entered? #f))
+ (match rest
+ (() (reverse result))
+ ((node . tail)
+ (let* ((level (node->level node))
+ (at-section? (if (pair? heading)
+ (equal? heading node)
+ ;; heading is a symbol
+ (and (pair? node)
+ (eq? heading (car node)))))
+ (leaving-section? (and entered?
+ (and level (<= level heading-level)))))
+ (loop (cond
+ (at-section? ;skip section
+ (cons*
+ `(*COMMENT*
+ ,(format #f "\
+TODO: Review (delete/relocate) the following text (if any)
+orphaned by splicing the `~a' node." heading))
+ result))
+ (entered? ;decrement child headings
+ (cons (decrement-heading node) result))
+ (else ;leave untouched
+ (cons node result)))
+ tail
+ (if entered?
+ (not leaving-section?) ;leave section?
+ at-section?))))))) ;enter section
+
+\f
+;;;
+;;; HTML conversion related.
+;;;
+
+(define (dl->@table node)
+ "Transform a <dl> SHTML NODE into a Texinfo @table."
+ (define (dl-node->alist node)
+ (let loop ((result '())
+ (current-terms '())
+ (current-descriptions '())
+ (rest (sxml-match node
+ ((dl . ,rest)
+ rest)
+ (,other (error "expected dl node, got" node)))))
+ (match rest
+ (()
+ ;; Produce last entry.
+ (reverse (cons (cons (reverse current-terms)
+ (reverse current-descriptions))
+ result)))
+ (((? string?) . rest)
+ ;; Disregard any interspersed strings, which are typically used
+ ;; for spacing purposes.
+ (loop result current-terms current-descriptions rest))
+ ((('dt term ...) . rest)
+ (let ((texi-term (string-join (map html->texinfo term) "")))
+ (if (null? current-descriptions)
+ (loop result
+ (cons texi-term current-terms)
+ current-descriptions rest)
+ ;; Produce last table item/description pair, if description was
+ ;; set.
+ (loop (cons (cons (reverse current-terms)
+ (reverse current-descriptions)) result)
+ (list texi-term) '() rest))))
+ ((('dd description ...) . rest)
+ (when (null? current-terms)
+ (error "malformed dl HTML"))
+ (loop result current-terms
+ (cons (string-join (map html->texinfo description) "")
+ current-descriptions)
+ rest)))))
+
+ (format #f "\
+@table @asis
+~{~a~}\
+@end table~%" (map (match-lambda
+ ;; Each dl "row" can have multiple terms and descriptions.
+ ((terms . descriptions)
+ (match terms
+ ((term term* ..1)
+ (format #f "\
+@item ~a
+~{@itemx ~a~^~%~}
+~{~a~}~%~%" term term* descriptions))
+ ((term)
+ (format #f "\
+@item ~a
+~{~a~}~%~%" term descriptions)))))
+ (dl-node->alist node))))
+
+;;; Data abstraction to store a table cell.
+(define-record-type <table-cell>
+ (make-table-cell value header?)
+ table-cell?
+ (value table-cell-value)
+ (header? table-cell-header?))
+
+(define (table->multitable node)
+ "Transform an HTML table NODE into a Texinfo multitable string."
+ (define (td-or-th->table-cell node)
+ (sxml-match node
+ ((td ,value ...)
+ (make-table-cell (string-join (map html->texinfo value) "")
+ #f))
+ ((th ,value ...)
+ (make-table-cell (string-join (map html->texinfo value) "")
+ #t))))
+
+ (define (tr->table-cells node)
+ (sxml-match node
+ ((tr ,td-or-th ...)
+ (map td-or-th->table-cell td-or-th))))
+
+ (define (table-data->column-widths data)
+ ;; Return the maximum width found for each column in a table's DATA.
+ (let loop ((data data)
+ (column-widths (make-hash-table)))
+ (if (null? data)
+ (sort (hash-table->alist column-widths)
+ (lambda (x x*)
+ (< (car x) (car x*))))
+ (let lp ((index 0)
+ (cells (car data))
+ (column-widths column-widths))
+ (if (null? cells)
+ (loop (cdr data) column-widths)
+ (let ((current-max-width (hash-table-ref/default
+ column-widths index 0))
+ (cell (car cells)))
+ (hash-table-set! column-widths index
+ (max (string-length (table-cell-value cell))
+ current-max-width))
+ (lp (1+ index) (cdr cells) column-widths)))))))
+
+ (define (column-widths->multitable-column-fractions column-widths)
+ (let* ((columns-count (length column-widths))
+ (widths (map cdr column-widths))
+ (total-width (reduce + 0 widths))
+ (format-string (string-join (make-list columns-count "~1,2f") " ")))
+ (format #f "@columnfractions ~?" format-string
+ (map (lambda (w)
+ (/ w total-width))
+ widths))))
+
+ (let* ((table-data (sxml-match node
+ ((table ,tr ...)
+ (map tr->table-cells tr))))
+ (column-widths (table-data->column-widths table-data))
+ (column-fractions (column-widths->multitable-column-fractions
+ column-widths))
+ (table-content (string-join ;join table rows
+ (map (lambda (row)
+ (string-append
+ (if (any table-cell-header? row)
+ "@headitem "
+ "@item ")
+ (string-join ;join table cells
+ (map table-cell-value row)
+ " @tab ")))
+ table-data)
+ "\n")))
+ (string-append "@multitable " column-fractions "\n"
+ table-content "\n@end multitable")))
+
+(define* (html->texinfo node #:key srfi deffn?)
+ "A HTML node to Texinfo converter, applied recursively to NODE, with the
+SRFI string prefix, e.g. \"SRFI 151\", used to produce unique @node for
+sections. DEFFN? indicates whether conversion rules for use with
+'@deffn' nodes should be used."
+ (sxml-match node
+ ((h1 ,value)
+ (format #f "
+@node ~a ~a
+@subsubsection ~a ~a~%~%" srfi (string-replace-substring value "," "")
+srfi value))
+ ((h2 ,value)
+ (format #f "~%@subsubheading ~a~%~%"
+ value))
+ ;; Procedure definitions in the style of SRFI 151.
+ ((p (tt ,proc) . ,rest) (guard (and (string-prefix? "(" proc)
+ (member '(tt ")") rest)))
+ (node->definitions node #:style-hint 'srfi-151))
+ ;; Procedure definitions in the '<pre>' style of SRFI 64.
+ ((pre "(" (b ,proc) . ,rest) (guard (or (member ")" rest)
+ (member ")\n" rest)
+ (member "])\n" rest)
+ (member " ...)\n" rest)))
+ (node->definitions node #:style-hint 'srfi-64-pre))
+ ;; Procedure definitions in the '<code>' style of SRFI 64. The
+ ;; signature usually looks like (p (code "(" (b "proc") ...)), but
+ ;; since there can be trailing text describing the code element, we
+ ;; use the following catchall pattern with a guard:
+ ((p . ,rest) (guard (find (match-lambda
+ (('code "(" ('b proc) . rest)
+ #t)
+ (('code "(" ('var proc) . rest)
+ #t)
+ (_ #f))
+ rest))
+ (node->definitions node #:style-hint 'srfi-64-code))
+ ((p . ,rest) (guard (find (match-lambda
+ (('code (and (? string?)
+ (? (cut string-prefix? "(" <>)))
+ . rest)
+ (any (lambda (x)
+ (and (string? x)
+ (string-contains x ") ->")))
+ rest))
+ (_ #f))
+ rest))
+ (node->definitions node #:style-hint 'srfi-160-code))
+ ((p (code ,proc) . ,rest) (guard (and (string? proc)
+ (string-prefix? "(" proc)
+ (member '(code ")") rest)))
+ (node->definitions node #:style-hint 'srfi-178-code))
+ ((p . ,rest) (guard (find (match-lambda
+ (('code proc . rest)
+ (and (string? proc)
+ (string-prefix? "(" proc)
+ (any (cut string-suffix? ") -" <>)
+ (filter string? rest))))
+ (_ #f))
+ rest))
+ (node->definitions node #:style-hint 'srfi-178-code-with-return-type))
+ ((p ,(node) ...)
+ (string-join `("\n" ,@node "\n") ""))
+ ((small ,(node) ...)
+ (format #f "~{~a~}" node))
+ ((pre ,(node) ...)
+ (format #f "~%@lisp
+~{~a~}@end lisp~%" node))
+ ((a (@ (href ,href)) ,title ...)
+ (format #f "@url{~a, ~{~a~^ ~}}" href (map string-trim-both title)))
+ ((b ,value)
+ (format #f "@b{~a}" value))
+ ((blockquote ,(node) ...)
+ (format #f "~{~a~}" node))
+ ((br) "\n")
+ ((code (var ,value))
+ (format #f "@var{~a}" value))
+ ((code ,(node) ...)
+ (format #f "@code{~{~a~}}" node))
+ ((*COMMENT* ,value)
+ (string-append "@c " (string-replace-substring
+ (string-trim-both value) "\n" "\n@c ")
+ "\n\n"))
+ ((dfn ,value)
+ (format #f "@dfn{~a}" value))
+ ((*ENTITY* "additional" "copy")
+ "@copyright{}")
+ ((*ENTITY* "additional" "mdash")
+ "---") ;em dash
+ ((*ENTITY* "additional" "nbsp")
+ "@tie{}") ;non-breakable space
+ ((*ENTITY* "additional" "rArr") ;rightwards double arrow
+ "@U{21D2}")
+ ((*ENTITY* "additional-char" ,value)
+ (format #f "@U{~x}" (string->number value)))
+ ((i ,(node) ...)
+ (format #f "@i{~{~a~}}" node))
+ ((q ,value)
+ (format #f "``~a''" value))
+ ((em ,(node) ...)
+ (guard deffn?)
+ (format #f "~{~a~^ ~}" node))
+ ((em ,(node) ...)
+ (guard (not deffn?))
+ (format #f "@emph{~{~a~}}" node))
+ ((dl . ,rest)
+ (dl->@table node))
+ ((hr) "\n")
+ ((address ,(node) ...)
+ (string-join node ""))
+ ((table . ,rest)
+ (table->multitable (cons 'table rest)))
+ ((ol (li ,(node) ...) ...)
+ (format #f "~%@enumerate
+~{@item~%~{~a~}~^~%~%~}
+@end enumerate~%" node))
+ ((ul (li ,(node) ...) ...)
+ (format #f "~%@itemize
+~{@item~%~{~a~}~^~%~%~}
+@end itemize~%" node))
+ ((sup ,value)
+ (format #f "@sup{~a}" value))
+ ((sub ,value)
+ (format #f "@sub{~a}" value))
+ ((tt ,value ...)
+ (format #f "@code{~{~a~}}" value))
+ ((var ,value)
+ (format #f "@var{~a}" value))
+ (,other other)))
+
+(define (process-args args)
+ "Process the arguments to have them in the format expected by Texinfo's
+@deffn, stripping extraneous metadata. SRFI is a string such as \"SRFI
+64\", used to prefix Texinfo nodes."
+ (reverse
+ ;; Convert SHTML to Texinfo, and coalesce brackets into arguments.
+ (match (fold
+ (lambda (node tree) ;fhere
+ (let ((new (string-replace-substring
+ (html->texinfo node #:deffn? #t)
+ ;; Strip closing quote (SRFI 160).
+ ") -> " "-> ")))
+ (match tree
+ (("[" . rest)
+ (cons (string-append "[" new) rest))
+ (("[[" . rest)
+ (cons (string-append "[[" new) rest))
+ (("]" . (s . tail))
+ (cons* new (string-append s "]") tail))
+ ;; SRFI 160.
+ (((and (? string? s1) (? (cut string-prefix? "]]" <>)))
+ . (s2 . tail))
+ (cons* new (string-trim-both (string-drop s1 2))
+ (string-append s2 "]]") tail))
+ (((and (? string? s1) (? (cut string-prefix? "]" <>)))
+ . (s2 . tail))
+ (cons* new (string-trim-both (string-drop s1 1))
+ (string-append s2 "]") tail))
+ ;; SRFI 178.
+ (((and (? string? s1) (? (cut string-suffix? "[" <>)))
+ . tail)
+ (cons* (string-append "[" new)
+ (string-append (string-trim-both
+ (string-drop-right s1 1)))
+ tail))
+ (() (cons new tree))
+ (other (cons new other)))))
+ '()
+ args)
+ ;; Post-process for a potential trailing ']'.
+ (("]" . (s . tail))
+ (cons (string-append s "]") tail))
+ (((and (? string? s1) (? (cut string-prefix? "]]" <>))) . (s2 . tail))
+ (cons* (string-trim-both (string-drop s1 2))
+ (string-append s2 "]]") tail))
+ (((and (? string? s1) (? (cut string-prefix? "]" <>))) . (s2 . tail))
+ (cons* (string-trim-both (string-drop s1 1))
+ (string-append s2 "]") tail))
+ (other other))))
+
+(define (sanitize-definitions-node node)
+ "Recursively sanitize arguments, removing extraneous white space."
+ (first (foldts
+ (lambda (seed node) ;fdown
+ '())
+ (lambda (seed kid-seed node) ;fup
+ (sxml-match node
+ ((*ENTITY* "additional" "nbsp")
+ seed) ;discard
+ ((i ,value)
+ (cons value seed))
+ ((var ,value)
+ (cons value seed))
+ (,other
+ (cons (reverse kid-seed) seed))))
+ (lambda (seed node) ;fhere
+ (let ((node (if (string? node)
+ (string-trim-both node)
+ node)))
+ (match node
+ ((or "..." "…")
+ (cons "@dots{}" seed))
+ ((and (? string?) (? string-null?))
+ seed) ;discard node
+ (other
+ (cons node seed)))))
+ '()
+ node)))
+
+(define* (node->definitions node #:key style-hint)
+ "Convert NODE, an SHTML expression assumed to contain
+procedure definitions, to Texinfo. STYLE-HINT may be used to provide a
+hint about which HTML scheme is being used to format the definitions."
+ ;; This is messy because SRFIs appear to all use their own special
+ ;; variant to format procedure/syntax definitions.
+ (pk 'style-hint style-hint)
+ (pk 'node node)
+ (let ((node (sanitize-definitions-node node)))
+
+ (define (deffn proc args continued?)
+ (unless proc
+ (error "expected a string for 'proc', got" proc))
+ (format #f "~%@deffn~:[~;x~] {Scheme Procedure} ~{~a ~^~}~%"
+ continued? (process-args (cons proc args))))
+
+ (if (eq? 'srfi-160-code style-hint)
+ ;; Definitions in SRFI 160 are special in that no grouping
+ ;; information can be inferred, and a return value and SRFI
+ ;; annotation are added at the end.
+ (match node
+ ((p ('code (and (? string? proc) (? (cut string-prefix? "(" <>)))
+ . rest) srfi ...)
+ (string-append (deffn (string-trim-both (string-drop proc 1))
+ (append rest srfi) #f)
+ "\
+@c FIXME: Check deffn category and adjust '@end deffn' location
+@end deffn\n\n")))
+
+ (let loop ((result '())
+ (doc '())
+ (rest (cdr node))
+ (continued? #f)
+ (proc #f)
+ (args '()))
+
+ (pk 'called-loop-with-proc proc)
+ (match rest
+ (()
+ (pk 'closing-deffn-on-empty-list)
+ (pk 'doc doc)
+ ;; The (p (code (b procedure) args ... doc ...)) style used by
+ ;; SRFI-64 allows to correctly close the definition.
+ (let ((result (if (null? doc) ;srfi-64 <code> trailing doc
+ (cons "\
+@c FIXME: Check deffn category and adjust '@end deffn' location
+@end deffn\n\n" result)
+ (cons* "@end deffn\n"
+ (html->texinfo `(p ,@(reverse doc)))
+ result))))
+ (string-join (cons "\n" (reverse result)) "")))
+ ((head . tail)
+ (pk 'GOT-HEAD head 'REST tail)
+ (match head
+ ("(" ;skip opening parenthesis
+ (loop result doc tail continued? proc args)) ;no-op
+ ;; SRFI 64 <code> procedure definition node.
+ (('code "(" ((or 'b 'var) p) . rest)
+ (pk 'setting-proc p)
+ ;; Dump accumulated leading documentation, if any.
+ (let ((result (if (null? doc)
+ result
+ (cons (html->texinfo `(p ,@(reverse doc)))
+ result))))
+ (if proc
+ ;; New continued procedure.
+ (loop result '() (append rest tail) #t p '())
+ (loop result '() (append rest tail) continued? p '()))))
+ (('code (and (? string? p)
+ (? (cut string-prefix? "(" <>))) . rest)
+ ;; SRFI 178 style.
+ (pk 'setting-proc p)
+ ;; Dump accumulated leading documentation, if any.
+ (let ((result (if (null? doc)
+ result
+ (cons (html->texinfo `(p ,@(reverse doc)))
+ result)))
+ (p (string-trim-right (string-drop p 1))))
+ (if proc
+ ;; New continued procedure.
+ (loop result '() (append rest tail) #t p '())
+ (loop result '() (append rest tail) continued? p '()))))
+ ((or ('tt ")") ")" ")\n" "])" "])\n" " ...)" " ...)\n"
+ ('code ")")) ;end
+ (let* ((args (if (and (string? head) (string-index head #\]))
+ (cons "]" args)
+ args))
+ (args* (if (and (string? head)
+ (string-prefix? " ..." head))
+ (cons " ..." args)
+ args)))
+ (pk 'calling-deffn-in-end)
+ (loop (cons (deffn proc (reverse args*) continued?) result)
+ doc
+ tail
+ #t ;mark next definitions as continued
+ #f '())))
+ ((and (? string?) (? (cut string-suffix? ") -" <>))) ;end
+ ;; Definition ended but there is a trailing returned type
+ ;; annotation (e.g. "-> bitvector") to add as an argument.
+ (let* ((tail-length (length tail))
+ (args `(,@(if (>= tail-length 2)
+ (list (second tail))
+ '())
+ "->"
+ ,(string-drop-right head 3)
+ ,@args)))
+ (pk 'calling-deffn-in-end)
+ (loop (cons (deffn proc (reverse args) continued?) result)
+ doc
+ (if (>= tail-length 2)
+ (drop tail 2)
+ tail)
+ #t ;mark next definitions as continued
+ #f '())))
+ (('tt (and (? string?) (? (cut string-prefix? "(" <>)) p))
+ (when proc
+ (error "unexpected proc encountered while already defined" p))
+ (let ((p (string-trim-right (string-drop p 1))))
+ (pk 'setting-proc p)
+ (loop result doc tail continued? p '())))
+ (('b p) ;for SRFI 64 <pre>
+ (pk 'setting-proc p)
+ ;; Dump accumulated leading documentation, if any.
+ (let ((result (if (null? doc)
+ result
+ (cons (html->texinfo `(p ,@doc)) result))))
+ (if proc
+ (loop result '() tail #t p '()) ;new continued procedure
+ (loop result '() tail continued? p '()))))
+ (('br) ;continued?
+ (pk 'got-br)
+ (if (eq? 'srfi-64-code style-hint)
+ ;; For SRFI 64 <code> style definitions, this should be a
+ ;; no-op.
+ (loop result doc tail continued? proc args)
+ (loop result doc tail #t #f '())))
+ (other
+ (pk 'got-arg other)
+ (if proc
+ (loop result doc tail continued? proc (cons other args))
+ ;; The argument was seen after proc definition was
+ ;; closed; preserve it as documentation.
+ (begin (pk 'keeping-as-doc other)
+ (loop result (cons other doc)
+ tail continued? proc args)))))))))))
+
+(define (snarfi . args)
+ "snarf documentation from the first argument, a srfi html spec source
+file assumed to follow the basic structure of the SRFI template (see:
+https://srfi.schemers.org/srfi-template.html)."
+ (match args
+ (((or "-h" "--help"))
+ (usage))
+ ((file)
+ (let* ((shtml (call-with-input-file file
+ (cut html->shtml <> #:strict? #t)))
+ (title (first ((sxpath '(// html head title *text*)) shtml)))
+ (srfi (and=> (string-match "SRFI [[:digit:]]+" title)
+ match:substring))
+ (body (first ((sxpath '(// html body)) shtml)))
+ (content-level (or (node->level
+ (find-heading-by-text "Abstract" body))
+ (error "could not locate 'Abstract' section")))
+ (body* (if (> content-level 1)
+ (splice-children (pk 'splicing-with (string->symbol
+ (format #f "h~a" (1- content-level))))
+ body)
+ body))
+ (content (let loop ((result '())
+ (rest body*)
+ (entered? #f))
+ (match rest
+ (() (reverse result))
+ ((node . tail)
+ (if (section-of-interest? node entered?)
+ (loop (cons node result) tail #t)
+ (loop result tail #f))))))
+ (specification-max-depth (section->children-max-depth
+ '(h1 "Specification") content))
+ (content* (if (> specification-max-depth 2)
+ (splice-children '(h1 "Specification") content)
+ content))
+ ;; Sanitize the SHTML to remove spurious "\r\n" or "\n"
+ ;; strings, which would otherwise prevent some of the
+ ;; template patterns to match. Also make some safe
+ ;; substitutions.
+ (scontent (foldts
+ (lambda (seed node) ; fdown
+ '())
+ (lambda (seed kid-seed node) ; fup
+ (match node
+ (('@ ('id id))
+ ;; IDs may appear anywhere and break pattern
+ ;; matching; skip them.
+ seed)
+ (other (cons (reverse kid-seed) seed))))
+ (lambda (seed tree) ; fhere
+ (let ((tree (if (string? tree)
+ ((compose
+ ;; Do not end sentences when
+ ;; using the 'e.g.' latin
+ ;; locution abbreviation.
+ (cut string-replace-substring <>
+ "e.g." "e.g.@:")
+ (cut string-replace-substring <>
+ "E.g." "E.g.@:")
+ ;; Use @dots{} for ellipses.
+ (cut string-replace-substring <>
+ "..." "@dots{}")
+ ;; Double all '@'s, for Texinfo.
+ (cut string-replace-substring <>
+ "@" "@@"))
+ tree)
+ tree)))
+ (match tree
+ ((and (? string?)
+ (? (cut string-match
+ "^(\\.?\r?\n|[[:space:]]+)$" <>)))
+ seed) ;skip white space atoms
+ (other (cons tree seed)))))
+ '()
+ content*))
+ (_ (begin (pk 'scontent) (pretty-print scontent)))
+ (templates `((*any* . ,(cut html->texinfo <> #:srfi srfi))))
+ (texi (apply-templates scontent templates)))
+ (pretty-print (string-replace-substring (string-append "\
+@node " srfi "
+@subsection " title "
+@cindex " srfi "
+
+" (string-join texi "")
+"
+") "\r\n" "\n")
+ #:display? #t)))
+ (_ (usage))))
+
+(define main snarfi)
+
+;;; snarfi ends here
--
2.41.0
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