664 lines
21 KiB
Scheme
664 lines
21 KiB
Scheme
;;; GNU info -> HTML gateway for the SU web server. -*- Scheme -*-
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;;; This file is part of the Scheme Untergrund Networking package.
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;;; Copyright (c) 1996 by Mike Sperber.
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;;; based on code with the same purpose by Gaebe Engelhart
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;;; For copyright information, see the file COPYING which comes with
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;;; the distribution.
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;;; (info-handler parse-info reference find-icon address) -> handler
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; This function creates a request handler that converts GNU info pages
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;;; on-the-fly. It is highly parameterizable to accomodate a wide
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;;; range of environments. The parameters specify how to find the
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;;; source code for the info pages, and how to generate certain
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;;; elements of the generated HTML output.
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;;;
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;;; PARSE-INFO specifies how to parse the URLs that end up in the
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;;; handler.
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;;; It can be:
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;;;
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;;; * a procedure which is called with the URL as its parameters.
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;;; It is expected to return with two values, FIND-ENTRY and
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;;; NODE-NAME. FIND-ENTRY, in turn, can be either a procedure
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;;; which gets passed the file name of an info node and is
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;;; supposed to return with an absolute name of same. If it is a
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;;; list, that list is taken as a list of directories in which to
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;;; search for the info files. NODE-NAME is supposed to be the
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;;; name of an info node of the form (<file>)<node>, extracted
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;;; from the URL.
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;;;
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;;; * a list, in which case that is taken as a list of
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;;; directories in which to search for the info files. The node
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;;; name of a node is extracted from the URL by just taking the
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;;; search component of the URL.
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;;;
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;;; * #f in which case the info path is taken from the environment
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;;; variable INFOPATH, and the node name extraction works as
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;;; above.
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;;;
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;;; REFERENCE specifies how to generate cross-references to other info
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;;; nodes. It can be:
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;;;
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;;; * a procedure which gets called with the URL of the info page
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;;; which contains the reference, and the node name of the node
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;;; to be referenced. The procedure is expected to return the
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;;; text for a link.
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;;;
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;;; * a string, in which case that is to be a prefix to which the
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;;; node name is simply appended to yield the new link.
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;;;
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;;; * #f in which case all references have the form
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;;; info?<node-name>.
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;;;
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;;; FIND-ICON specifies to to find the various icons used to decorate
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;;; info pages. It can be:
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;;;
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;;; * a procedure which gets passed one of the tags in
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;;; DEFAULT-ICON-ALIST and is supposed to return a link for the
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;;; appropriate icon (or #f if no icon is to be used)
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;;;
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;;; * a string which is taken as a prefix to which one of the
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;;; appropriate icon name from DEFAULT-ICON-ALIST is appended.
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;;; (Note that these icon names were stolen from the
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;;; cern-httpd-3.0 distribution at
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;;; http://www.w3.org/pub/WWW/Daemon/.)
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;;;
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;;; * a list which is taken as an alist of the same format as
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;;; DEFAULT-ICON-ALIST.
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;;;
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;;; * #f in which case no icons are used.
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;;;
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;;; ADDRESS a string to be appended at the bottom of all info pages
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;;;
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;;; To install a vanilla info handler for a prefix "info?" that looks
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;;; in the environment variable INFOPATH, just use something like
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;;; (info-handler #f #f #f "Generated by info-gateway")
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;;; TODO: write a CGI version of this
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(define-condition-type 'info-gateway-error '(error))
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(define info-gateway-error? (condition-predicate 'info-gateway-error))
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(define (info-gateway-error msg . irritants)
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(apply signal 'info-gateway-error msg irritants))
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(define default-icon-alist
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'((info . "infodoc.gif")
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(up . "up.gif")
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(next . "next.gif")
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(previous . "prev.gif")
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(menu . "menu.gif")))
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(define (info-handler parse-info reference find-icon address)
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(let ((icon-name
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(cond
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((procedure? find-icon) find-icon)
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((string? find-icon)
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(let ((alist
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(map (lambda (entry)
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(cons (car entry)
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(string-append find-icon (cdr entry))))
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default-icon-alist)))
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(lambda (tag)
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(cond ((assq tag alist) => cdr)
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(else #f)))))
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((list? find-icon)
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(lambda (tag)
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(cond ((assq tag find-icon) => cdr)
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(else #f))))
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(else (lambda (tag) #f))))
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(parse-info-url
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(cond
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((procedure? parse-info) parse-info)
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((list? parse-info) ; it's an info path
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(lambda (url)
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(values parse-info
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(unescape-uri (http-url-query url)))))
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(else
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(let ((info-path
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((infix-splitter ":")
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(or (getenv "INFOPATH")
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(begin
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(format (current-error-port)
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"~%Warning: environment variable INFOPATH is unset.~%")
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"")))))
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(lambda (url)
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(values info-path
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(unescape-uri (http-url-query url))))))))
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(make-reference
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(cond
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((procedure? reference) reference)
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((string? reference)
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(lambda (url node-name)
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(string-append reference node-name)))
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(else
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(lambda (url node-name)
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(string-append "info?" node-name))))))
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(lambda (path req)
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(let ((request-method (request-method req)))
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(cond
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((string=? request-method "GET")
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(with-fatal-error-handler
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(lambda (c decline)
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(cond
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((info-gateway-error? c)
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(apply http-error (status-code bad-gateway) req
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(condition-stuff c)))
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((http-error? c)
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(apply http-error (car (condition-stuff c)) req
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(cddr (condition-stuff c))))
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(else
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(decline))))
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(make-response
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(status-code ok)
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#f
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(time)
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"text/html"
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'()
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(make-writer-body
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(lambda (out options)
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(emit-prolog out)
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(receive (find-entry node-name) (parse-info-url (request-url req))
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(display-node node-name
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(file-finder find-entry)
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(referencer make-reference (request-url req) out)
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icon-name
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out))
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(with-tag out address ();; this is outside the html element?
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(write-string address out)))))))
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((or (string=? request-method "HEAD")
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(string=? request-method "POST"))
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(make-error-response (status-code method-not-allowed) req
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"GET"))
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(else
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(make-error-response (status-code not-implemented) req)))))))
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(define split-header-line
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(let ((split (infix-splitter (make-regexp "(, *)|( +)|( *\t *)")))
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(split-field (infix-splitter (make-regexp ": *"))))
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(lambda (l)
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(let ((fields (map split-field (split l))))
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(define (search-field regexp)
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(cond
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((find (lambda (field)
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(string-match regexp (car field)))
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fields)
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=> cadr)
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(else #f)))
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(values (search-field "[F|f]ile")
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(search-field "[N|n]ode")
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(search-field "[U|u]p")
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(search-field "[P|p]rev(ious)?")
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(search-field "[N|n]ext"))))))
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(define (replace-if-empty-string s v)
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(if (zero? (string-length s))
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v
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s))
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(define (string-newline->space s)
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(string-map (lambda (c)
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(if (char=? c #\newline)
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#\space
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c))
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s))
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(define (parse-node-name node-name)
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(cond
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((string-match "^\\((.*)\\)(.*)$" (string-newline->space node-name))
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=> (lambda (match)
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(values
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(replace-if-empty-string (match:substring match 1) #f)
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(replace-if-empty-string (match:substring match 2) "Top"))))
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(else (values #f (string-newline->space node-name)))))
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(define (unparse-node-name file node)
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(let* ((ext (file-name-extension file))
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(file (if (string=? ext ".info")
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(file-name-sans-extension file)
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file)))
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(receive (file node) (if (and (string=? "dir" file)
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(not (string=? "" node))
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(not (string=? "Top" node)))
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(values node "Top")
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(values file node))
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(string-append "(" file ")" node))))
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(define (display-icon file alt out)
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(emit-tag out 'img
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(cons 'src file)
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(cons 'alt alt)
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(cons 'align "bottom")))
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(define (referencer make-reference old-entry out)
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(lambda (file node-name label . maybe-icon)
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(receive (node-file node) (parse-node-name node-name)
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(let ((file (or node-file file)))
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(with-tag out a ((href (make-reference
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old-entry
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(escape-uri (unparse-node-name file node)))))
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(if (and (not (null? maybe-icon))
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(car maybe-icon))
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(display-icon (car maybe-icon) (cadr maybe-icon) out))
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(emit-text label out))))))
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(define node-prologue (ascii->char 31))
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(define node-epilogue-regexp
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(make-regexp
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(string-append (regexp-quote (string node-prologue))
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"|"
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(regexp-quote (string (ascii->char 12))))))
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(define (string-starts-with-char? s c)
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(and (not (zero? (string-length s)))
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(char=? c (string-ref s 0))))
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(define (node-prologue? s)
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(string-starts-with-char? s node-prologue))
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(define (node-epilogue? s)
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(regexp-exec node-epilogue-regexp s))
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;; Document title
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(define (display-title file node up previous next
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display-reference icon-name out)
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(define (maybe-display-header header icon alt)
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(if header
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(begin
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(newline out)
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(with-tag out b ()
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(display-reference file header header icon alt)))))
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(emit-title out (string-append "Info Node: "
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(unparse-node-name file node)))
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(with-tag out h1 ()
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(emit-tag out 'img
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(cons 'src (icon-name 'info))
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(cons 'alt "Info Node")
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(cons 'align 'bottom))
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(write-string (unparse-node-name file node) out))
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(emit-tag out 'hr)
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(maybe-display-header next (icon-name 'next) "[Next]")
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(maybe-display-header previous (icon-name 'previous) "[Previous]")
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(maybe-display-header up (icon-name 'up) "[Up]")
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(if (or next previous up)
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(emit-tag out 'hr)))
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;; Text
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;; Dealing with cross references
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;; info sucks
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(define xref-marker-regexp (make-regexp "\\*[Nn]ote([ \n]|$)"))
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(define xref-regexp (make-regexp "\\*[Nn]ote *([^:]*): *([^\t\n,.;:?!]*)"))
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(define max-xref-lines 3)
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(define complete-line
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(let ((split-xref-markers (field-splitter xref-marker-regexp))
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(split-xrefs (field-splitter xref-regexp))
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(cr (string #\newline)))
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(lambda (line port)
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(let loop ((line line) (count max-xref-lines))
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(let ((xref-markers (split-xref-markers line))
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(xrefs (split-xrefs line)))
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(if (= (length xref-markers) (length xrefs))
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line
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(if (zero? count)
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(info-gateway-error "invalid cross reference")
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(let ((new-line (read-line port)))
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(if (eof-object? new-line)
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(info-gateway-error
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"unexpected end of info file inside cross reference"))
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(loop (string-append line cr new-line) (- count 1))))))))))
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(define (display-xref xref file display-reference out)
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(let* ((match (regexp-exec xref-regexp xref))
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(note (match:substring match 1))
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(node-name (match:substring match 2))
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(node-name (if (string=? "" node-name) note node-name))
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(node-name (substring node-name
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(string-skip node-name char-set:whitespace)
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(string-length node-name))))
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(emit-text "See " out)
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(display-reference file node-name note)))
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(define display-text
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(let ((split-xrefs (infix-splitter xref-regexp #f 'split)))
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(lambda (line port file display-reference out)
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(let* ((line (complete-line line port))
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(components (split-xrefs line)))
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;; in components, every 2nd element is a cross reference
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;; also, it always has odd length or length zero
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(if (not (null? components))
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(let loop ((components components))
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(emit-text (car components) out)
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(if (not (null? (cdr components)))
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(begin
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(display-xref (cadr components) file display-reference out)
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(loop (cddr components))))))
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(newline out)))))
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;; Menus
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(define menu-regexp (make-regexp "^\\* +Menu:"))
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(define menu-item-regexp (make-regexp "^\\* +"))
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(define (char-splitter c)
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(lambda (s)
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(cond ((string-index s c)
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=> (lambda (i)
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(values (substring s 0 i)
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(substring s (+ 1 i) (string-length s)))))
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(else (values s "")))))
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(define colon-split (char-splitter #\:))
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(define (display-menu-item-header line port file display-reference icon-name out)
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(let ((menu-line-split (infix-splitter menu-item-regexp)))
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(receive (note rest) (colon-split (cadr (menu-line-split line)))
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(receive (node-name text)
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(cond
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((string-match ": *(.*)" rest)
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=> (lambda (match)
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(values note (match:substring match 1))))
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((string-match "^ *([^.]*)\\.? *(.*)" rest)
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=> (lambda (match)
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(values (match:substring match 1)
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(match:substring match 2))))
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(else
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(info-gateway-error "invalid menu item")))
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(emit-tag out 'dt)
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(display-reference file node-name note (icon-name 'menu) "*")
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(newline out)
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(if (and (not (string=? "" text))
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(not (string=? "." text)))
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(begin
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(emit-tag out 'dd)
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(display-text text port file display-reference out)))))))
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(define (display-menu line port file display-reference icon-name out)
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(emit-close-tag out 'pre)
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(with-tag out dl ()
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(let loop ((line line))
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(if (eof-object? line)
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(info-gateway-error "unexpected end of info file"))
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(display-menu-item-header line port file display-reference icon-name out)
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(let finish-item-loop ()
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(if (eof-object? line)
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(info-gateway-error "unexpected end of info file"))
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(let ((line (read-line port)))
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(cond
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((or (eof-object? line)
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(node-epilogue? line)
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(string=? "" line))
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(emit-tag out 'pre)
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(dispatch-line line port file display-reference icon-name out))
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((regexp-exec menu-item-regexp line)
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(loop line))
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(else
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(display-text line port file display-reference out)
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(finish-item-loop))))))))
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;; Central dispatch
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(define (dispatch-line line port file display-reference icon-name out)
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(cond
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((or (eof-object? line) (node-epilogue? line)) #f)
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((string=? "" line) (emit-p out) #t)
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((regexp-exec menu-regexp line) #t) ;; this should probably be expanded
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((regexp-exec menu-item-regexp line)
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(display-menu line port file display-reference icon-name out))
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(else
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(display-text line port file display-reference out) #t)))
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(define (display-body port file display-reference icon-name out)
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(let loop ()
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(let ((line (read-line port)))
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(if (dispatch-line line port file display-reference icon-name out)
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(loop)))))
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(define (display-node node-name find-file display-reference icon-name out)
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(receive (file node) (parse-node-name node-name)
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(receive (port file-header node-header up-header prev-header next-header)
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(find-node file node find-file)
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(with-tag out html (xmlnsdecl-attr)
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(with-tag out head ()
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(display-title file node-header up-header
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prev-header next-header
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display-reference icon-name
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out))
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(with-tag out body ()
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(with-tag out pre ()
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(display-body port file display-reference icon-name out))))
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(close-input-port port))))
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;; Finding nodes
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(define (ensure-node-prologue port msg)
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(let ((line (read-line port)))
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(if (or (eof-object? line)
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(not (node-prologue line)))
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(info-gateway-error "invalid info file" msg))))
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(define (ensure-regexp-line port regexp msg)
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(let ((line (read-line port)))
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(if (or (eof-object? line)
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(not (string-match regexp line)))
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(info-gateway-error "invalid info file" msg))))
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(define (ensure-tag-table-node port)
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(ensure-regexp-line port "^Tag Table:" "no tag table"))
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(define (ensure-indirect-tag-table-header port)
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(ensure-regexp-line port "^\\(Indirect\\)" "no indirect tag"))
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(define split-indirection (infix-splitter (make-regexp " *: *")))
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(define (parse-indirection line)
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(let ((l (split-indirection line)))
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(if (null? (cdr l))
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(info-gateway-error "invalid indirection entry in info file")
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(let ((file (car l))
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(seek-pos (string->number (cadr l))))
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(if (not seek-pos)
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(info-gateway-error "invalid indirection entry in info file"))
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(cons file seek-pos)))))
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(define (read-indirection-table port)
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(let loop ((table '()))
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(info-gateway-error "invalid info file"))
|
|
(if (node-epilogue? line)
|
|
(reverse table)
|
|
(loop (cons (parse-indirection line) table))))))
|
|
|
|
(define tag-seek-separator (ascii->char 127))
|
|
|
|
(define parse-tag
|
|
(let ((split (infix-splitter (make-regexp ", *")))
|
|
(split-field (infix-splitter ": "))
|
|
(split-node-info
|
|
(infix-splitter (string tag-seek-separator))))
|
|
|
|
(define (barf)
|
|
(info-gateway-error "invalid tag entry in info file"))
|
|
|
|
(lambda (line)
|
|
(let* ((fields (map split-field (split line)))
|
|
(file (cond
|
|
((assoc "File" fields)
|
|
=> (lambda (p)
|
|
(if (null? (cdr p)) (barf))
|
|
(cadr p)))
|
|
(else #f))))
|
|
(cond
|
|
((assoc "Node" fields)
|
|
=> (lambda (p)
|
|
(if (null? (cdr p)) (barf))
|
|
(let ((s (split-node-info (cadr p))))
|
|
(if (null? (cdr p)) (barf))
|
|
(let* ((node (car s))
|
|
(seek (string->number (cadr s))))
|
|
(if (not seek) (barf))
|
|
(values node file seek)))))
|
|
(else (barf)))))))
|
|
|
|
(define (find-tag node port)
|
|
(let loop ()
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(info-gateway-error "invalid info file"))
|
|
(if (regexp-exec node-epilogue-regexp line)
|
|
(http-error (status-code not-found) #f "node not found"))
|
|
(receive (entry-node file seek) (parse-tag line)
|
|
(if (string=? node entry-node)
|
|
(cons file seek)
|
|
(loop))))))
|
|
|
|
(define (find-indirection-entry seek-pos indirection-table)
|
|
(let loop ((table indirection-table))
|
|
(if (null? table)
|
|
(http-error (status-code not-found) #f "node not found"))
|
|
(let* ((entry (car table))
|
|
(pos (cdr entry)))
|
|
(if (and (>= seek-pos pos)
|
|
(or (null? (cdr table))
|
|
(let* ((next-entry (cadr table))
|
|
(next-pos (cdr next-entry)))
|
|
(< seek-pos next-pos))))
|
|
entry
|
|
(loop (cdr table))))))
|
|
|
|
(define (file-finder with)
|
|
(cond ((procedure? with) with)
|
|
((list? with)
|
|
(lambda (file)
|
|
(find-info-file file with)))))
|
|
|
|
(define (find-node-port-with-tag-entry node tag-entry ? find-file)
|
|
(let* ((port (if (input-port? ?) ? #f))
|
|
(indirection-table (if port #f ?))
|
|
(seek-pos (cdr tag-entry))
|
|
(indirection-entry
|
|
(and indirection-table
|
|
(find-indirection-entry seek-pos indirection-table)))
|
|
(seek-pos (if indirection-entry
|
|
(- seek-pos (cdr indirection-entry))
|
|
seek-pos))
|
|
;; that's what the documentation says ...
|
|
(seek-pos (if (>= seek-pos 1000)
|
|
(- seek-pos 1000)
|
|
0))
|
|
(file (or (car tag-entry)
|
|
(and indirection-entry
|
|
(car indirection-entry))))
|
|
(port (if file
|
|
(begin
|
|
(if port (close-input-port port))
|
|
(open-input-file (find-file file)))
|
|
port)))
|
|
(seek port seek-pos)
|
|
port))
|
|
|
|
(define (find-node file node find-file)
|
|
(if (not file)
|
|
(http-error (status-code not-found) #f
|
|
"no file in info node specification"))
|
|
|
|
(let* ((fname (find-file file))
|
|
(port (open-input-file fname)))
|
|
(let loop ((port port))
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(http-error (status-code not-found) #f "info node not found"))
|
|
(if (node-prologue? line)
|
|
(let ((header (read-line port)))
|
|
(if (eof-object? header)
|
|
(info-gateway-error "invalid info file"))
|
|
(cond
|
|
|
|
((string-match "^Indirect:" header)
|
|
(let ((indirection-table
|
|
(read-indirection-table port)))
|
|
(ensure-tag-table-node port)
|
|
(ensure-indirect-tag-table-header port)
|
|
(let ((tag-entry (find-tag node port)))
|
|
(close-input-port port)
|
|
(loop (find-node-port-with-tag-entry
|
|
node tag-entry indirection-table find-file)))))
|
|
|
|
((string-match "^Tag Table:" header)
|
|
(let ((tag-entry (find-tag node port)))
|
|
(loop (find-node-port-with-tag-entry
|
|
node tag-entry port find-file))))
|
|
|
|
((string-match "^File:" header)
|
|
(receive
|
|
(file-header node-header up-header prev-header next-header)
|
|
(split-header-line header)
|
|
(if (string=? node-header node)
|
|
(values port
|
|
file-header node-header
|
|
up-header prev-header next-header)
|
|
(loop port))))
|
|
(else (loop port))))
|
|
(loop port))))))
|
|
|
|
;; Finding files
|
|
|
|
(define (info-file-alternative-names file)
|
|
(receive (dir base ext) (parse-file-name file)
|
|
(let* ((base
|
|
(cond ((string-match "(.*)-info$" base)
|
|
=> (lambda (match)
|
|
(match:substring match 1)))
|
|
(else base)))
|
|
(base-ci (string-map char-downcase base))
|
|
(alts-1 (if (string=? base base-ci)
|
|
(list base)
|
|
(list base base-ci)))
|
|
(alts (append alts-1
|
|
(map (lambda (base)
|
|
(string-append base ".info"))
|
|
alts-1)))
|
|
(alts (append alts
|
|
(map (lambda (base)
|
|
(string-append base "-info"))
|
|
alts-1)))
|
|
(alts (map (lambda (f) (string-append dir f)) alts))
|
|
(alts (cons file alts)))
|
|
alts)))
|
|
|
|
(define (find-info-file file info-path)
|
|
(let ((alts (info-file-alternative-names file)))
|
|
(let path-loop ((path info-path))
|
|
(if (null? path)
|
|
(http-error (status-code not-found) #f "info file not found"))
|
|
(let alt-loop ((alts alts))
|
|
(if (null? alts)
|
|
(path-loop (cdr path))
|
|
(let ((try (string-append (file-name-as-directory (car path))
|
|
(car alts))))
|
|
(if (file-exists? try)
|
|
try
|
|
(alt-loop (cdr alts)))))))))
|