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Add negative-start rule #399

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Add negative-start rule #399

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c60f711
Add negative-start rule
eemeli Jun 19, 2023
f1166f5
Apply suggestions from code review
eemeli Jun 19, 2023
686e99c
Merge negative-start into unquoted-start
eemeli Jun 30, 2023
b8b0dfa
Update spec/message.abnf
eemeli Jul 2, 2023
dd3abc7
Merge branch 'main' into negativity
eemeli Sep 2, 2023
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5 changes: 3 additions & 2 deletions spec/message.abnf
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Expand Up @@ -36,11 +36,12 @@ quoted-char = %x0-5B ; omit \
/ %x7D-D7FF ; omit surrogates
/ %xE000-10FFFF

; based on https://www.w3.org/TR/xml/#NT-Nmtoken,
; but cannot start with U+002D HYPHEN-MINUS or U+003A COLON ":"
; literals that do not require quoting
; containing no whitespace and with a restricted range of characters
unquoted = unquoted-start *name-char
unquoted-start = name-start / DIGIT / "."
/ %xB7 / %x300-36F / %x203F-2040
/ "-" ( DIGIT / "." )


; reserve sigils for private-use by implementations
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8 changes: 5 additions & 3 deletions spec/syntax.md
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Expand Up @@ -605,9 +605,10 @@ Implementations MUST NOT distinguish between _quoted_ and _unquoted_ literals
that have the same sequence of code points.

_Unquoted_ literals have a much more restricted range that
is intentionally close to the XML's [Nmtoken](https://www.w3.org/TR/xml/#NT-Nmtoken),
with the restriction that it MUST NOT start with `-` or `:`,
as those would conflict with _function_ start characters.
is intentionally close to XML's [Nmtoken](https://www.w3.org/TR/xml/#NT-Nmtoken).
To make _unquoted_ literals distinct from _function_ names,
a literal MUST be quoted if it begins with a `:`
or if it begins with a `-` that is **not** followed by a `.` or a digit.

```abnf
literal = quoted / unquoted
Expand All @@ -621,6 +622,7 @@ quoted-char = %x0-5B ; omit \
unquoted = unquoted-start *name-char
unquoted-start = name-start / DIGIT / "."
/ %xB7 / %x300-36F / %x203F-2040
/ "-" ( DIGIT / "." )
```

### Names
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