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[Identifier Escapes] Fix a corner case (#21)

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An escaped digit at the beginning of a selector should be
canonicalized as a hex escape.

See sass/dart-sass#485
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Natalie Weizenbaum 2018-09-26 21:05:52 -04:00 committed by GitHub
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6
accepted/identifier-escapes.changes.md
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@ -1,3 +1,9 @@
## Draft 3
* If a number is escaped at the beginning of an identifier, its canonical form
should be its hex escape rather than `\` followed by the character, since that
could be interpreted as a hex escape.
## Draft 2
* Include U+000D CARRIAGE RETURN and U+000C FORM FEED in the list of characters

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accepted/identifier-escapes.md
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@ -1,4 +1,4 @@
# Escapes in Identifiers: Draft 2
# Escapes in Identifiers: Draft 3
*([Issue](https://github.com/sass/sass/issues/1542), [Changelog](identifier-escapes.changes.md))*
@ -55,12 +55,16 @@ The canonical form of a code point is:
* a backslash followed by the code point's lowercase hex code followed by a
space if it's not printable or a newline; or
* a backslash followed by the code point's lowercase hex code followed by a
space if it's a digit at the beginning of an identifier; or
* a backslash followed by the literal code point.
For example, in SassScript:
* `ax`, `\61x`, and `\61 x` all parse to the unquoted string `ax`;
* `\7f x`, `\7fx`, and `\7Fx` all parse to the unquoted string `\7f x`; and
* `\31 x` and `\31x` parse to the unquoted string `\31 x`; and
* `\@x`, `\40x`, and `\0040x` all parse to the unquoted string `\@x`.
### Compatibility
@ -209,10 +213,12 @@ This production has the same grammar as [`escape`][escape] in CSS Syntax Level 3
* Otherwise, if `codepoint` is a [name code point][] and the `start` flag is
not set, return `character`.
* Otherwise, if `codepoint` is a [non-printable code point][], U+000A LINE
FEED, U+000D CARRIAGE RETURN, or U+000C FORM FEED:
* Otherwise, if `codepoint` is a [non-printable code point][], U+000A LINE FEED,
U+000D CARRIAGE RETURN, or U+000C FORM FEED; *or* if `codepoint` is a
[digit][] and the `start` flag is set:
[non-printable code point]: https://drafts.csswg.org/css-syntax-3/#non-printable-code-point
[digit]: https://drafts.csswg.org/css-syntax-3/#digit
* Let `code` be the lowercase hexadecimal representation of `codepoint`,
with no leading `0`s.
@ -220,3 +226,4 @@ This production has the same grammar as [`escape`][escape] in CSS Syntax Level 3
* Return `"\"` + `code` + `" "`.
* Otherwise, return `"\"` + `character`.