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[ABNF] Fix/improve handling of line terminators.

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Prohibit line terminators inside string literals. (This does not prohibit
escapes for line feed and/or carriage return; it prohibits actual line feeds and
carriage returns, which would break the string literal across lines.)

Explicate line terminators in block comments, so that an accurate line count can
be obtained more readily from the CSTs. (This is more relevant to the ACL2
formal development than to the Rust implementation, which does not have explicit
CSTs.)

Also reorder slightly some rules within the file.
This commit is contained in:
Alessandro Coglio 2022-06-11 15:56:49 -07:00
parent e8bff31356
commit 894e0af225
1 changed files with 30 additions and 20 deletions
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50
docs/grammar/abnf-grammar.txt
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@ -39,31 +39,40 @@ double-quote = %x22 ; "
single-quote = %x27 ; '
not-star = %x0-29 / %x2B-7F / safe-nonascii ; anything but *
not-star-or-slash = %x0-29 / %x2B-2E / %x30-7F / safe-nonascii
; anything but * or /
not-line-feed-or-carriage-return = %x0-9 / %xB-C / %xE-7F / safe-nonascii
; anything but <LF> or <CR>
not-double-quote-or-backslash = %x0-21 / %x23-5B / %x5D-7F / safe-nonascii
; anything but " or \
line-terminator = line-feed / carriage-return / carriage-return line-feed
whitespace = space / horizontal-tab / line-terminator
not-line-feed-or-carriage-return =
%x0-9 / %xB-C / %xE-7F / safe-nonascii
; anything but <LF> or <CR>
not-star-or-line-feed-or-carriage-return =
%x0-9/ %xB-C / %xD-29 / %x2B-7F / safe-nonascii
; anything but * or <LF> or <CR>
not-star-or-slash-or-line-feed-or-carriage-return =
%x0-9 / %xB-C / %xD-29 / %x2B-2E / %x30-7F / safe-nonascii
; anything but * or / or <LF> or <CR>
not-double-quote-or-backslash-or-line-feed-or-carriage-return =
%x0-9 / %xB-C / %xD-21 / %x23-5B / %x5D-7F / safe-nonascii
; anything but " or \ or <LF> or <CR>
comment = block-comment / end-of-line-comment
block-comment = "/*" rest-of-block-comment
rest-of-block-comment = "*" rest-of-block-comment-after-star
/ not-star rest-of-block-comment
rest-of-block-comment =
"*" rest-of-block-comment-after-star
/ not-star-or-line-feed-or-carriage-return rest-of-block-comment
/ line-terminator rest-of-block-comment
rest-of-block-comment-after-star = "/"
/ "*" rest-of-block-comment-after-star
/ not-star-or-slash rest-of-block-comment
rest-of-block-comment-after-star =
"/"
/ "*" rest-of-block-comment-after-star
/ not-star-or-slash-or-line-feed-or-carriage-return rest-of-block-comment
/ line-terminator rest-of-block-comment
end-of-line-comment = "//" *not-line-feed-or-carriage-return
@ -154,10 +163,11 @@ unicode-character-escape = %s"\u{" 1*6hexadecimal-digit "}"
string-literal = double-quote *string-literal-element double-quote
string-literal-element = not-double-quote-or-backslash
/ simple-character-escape
/ ascii-character-escape
/ unicode-character-escape
string-literal-element =
not-double-quote-or-backslash-or-line-feed-or-carriage-return
/ simple-character-escape
/ ascii-character-escape
/ unicode-character-escape
integer-literal = unsigned-literal
/ signed-literal