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Non-ASCII chars in identifiers aren't supported yet #111

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Merged
merged 2 commits into from
Oct 13, 2017
Merged

Non-ASCII chars in identifiers aren't supported yet #111

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Non-ASCII chars in identifiers aren't supported yet
brauliobz Sep 5, 2017
0e4342e
Removed unstable commented out text
brauliobz Oct 13, 2017
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26 changes: 7 additions & 19 deletions src/identifiers.md
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Expand Up @@ -2,32 +2,20 @@

> **<sup>Lexer:<sup>**
> IDENTIFIER :
> &nbsp;&nbsp; &nbsp;&nbsp; XID_start XID_continue<sup>\*</sup>
> &nbsp;&nbsp; | `_` XID_continue<sup>+</sup>
> &nbsp;&nbsp; &nbsp;&nbsp; [`a`-`z` `A`-`Z`]&nbsp;[`a`-`z` `A`-`Z` `0`-`9` `_`]<sup>\*</sup>
> &nbsp;&nbsp; | `_` [`a`-`z` `A`-`Z` `0`-`9` `_`]<sup>+</sup>

An identifier is any nonempty Unicode[^non_ascii_idents] string of the following form:
An identifier is any nonempty ASCII[^non_ascii_idents] string of the following form:

Either

* The first character has property [`XID_start`]
* The remaining characters have property [`XID_continue`]
* The first character is a letter
* The remaining characters are alphanumeric or `_`

Or

* The first character is `_`
* The identifier is more than one character, `_` alone is not an identifier
* The remaining characters have property [`XID_continue`]
* The remaining characters are alphanumeric or `_`

that does _not_ occur in the set of [keywords].

> **Note**: [`XID_start`] and [`XID_continue`] as character properties cover the
> character ranges used to form the more familiar C and Java language-family
> identifiers.



[`XID_start`]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Start%3A%5D&abb=on&g=&i=
[`XID_continue`]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Continue%3A%5D&abb=on&g=&i=
[keywords]: keywords.html
[^non_ascii_idents]: Non-ASCII characters in identifiers are currently feature
gated. This is expected to improve soon.
[^non_ascii_idents] Non-ASCII characters in identifiers are currently feature-gated. See [issue #28979](https://github.com/rust-lang/rust/issues/28979).