From 20e1c2e0059ed9ba366126c1d7637cef19dfd7ce Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 5 Dec 2020 20:10:26 +0530
Subject: email: Support remaining obsolete specification.

* email/email.scm (obs-phrase-list, obs-utext, obs-unstruct,
obs-optional): New macros.
(unstructured, in-reply-to, references, keywords, optional-field):
Include obsolete patterns.
---
 email/email.scm | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/email/email.scm b/email/email.scm
index e624a98..da2abf9 100644
--- a/email/email.scm
+++ b/email/email.scm
@@ -229,13 +229,25 @@
 (define-peg-pattern phrase body
   obs-phrase)
 
+(define-peg-pattern obs-phrase-list body
+  (and (? (or phrase cfws))
+       (* (and "," (or phrase cfws)))))
+
+(define-peg-pattern obs-utext body
+  (or "\x00" obs-no-ws-ctl vchar))
+
+(define-peg-pattern obs-unstruct body
+  (* (or (and (* "\n") (* "\r")
+              (* (and obs-utext (* "\n") (* "\r"))))
+         fws)))
 
 ;; ABNF modified to ignore leading whitespace
 ;; ABNF modified to allow for blank lines in folded field
 (define-peg-pattern unstructured body
-  (and (ignore (? fws))
-       (* (and (? fws) (? vchar)))
-       (ignore (* wsp))))
+  (or (and (ignore (? fws))
+           (* (and (? fws) (? vchar)))
+           (ignore (* wsp)))
+      obs-unstruct))
 
 ;;; Date and time specification
 
@@ -511,14 +523,20 @@
        (ignore ">") (ignore (? cfws))))
 
 (define-field-pattern message-id "Message-ID" msg-id)
-(define-field-pattern in-reply-to "In-Reply-To" (+ msg-id))
-(define-field-pattern references "References" (+ msg-id))
+(define-field-pattern in-reply-to "In-Reply-To"
+  (+ msg-id)
+  (* (or phrase msg-id)))
+(define-field-pattern references "References"
+  (+ msg-id)
+  (* (or phrase msg-id)))
 
 ;;; Informational fields
 
 (define-field-pattern subject "Subject" unstructured)
 (define-field-pattern comments "Comments" unstructured)
-(define-field-pattern keywords "Keywords" (and phrase (* (and "," phrase))))
+(define-field-pattern keywords "Keywords"
+  (and phrase (* (and "," phrase)))
+  obs-phrase-list)
 
 ;;; Resent fields
 
@@ -563,8 +581,12 @@
 (define-peg-pattern field-name all
   (+ ftext))
 
+(define-peg-pattern obs-optional body
+  (and field-name (ignore (and (* wsp) ":")) unstructured crlf))
+
 (define-peg-pattern optional-field all
-  (and field-name (ignore ":") unstructured crlf))
+  (or (and field-name (ignore ":") unstructured crlf)
+      obs-optional))
 
 ;;; MIME version
 
-- 
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