Should "Literal" in syntactical grammar instead of lexical grammar?

Brendan Eich brendan at mozilla.org
Tue Feb 28 22:04:29 PST 2012


程劭非 wrote:
> Thank you for the comments.
>
> There might be no normative significance but I mean there is no way to
> put the "Literal" production in a lexer. If a lexer produce token with
> type ”Literal“, syntactical parser will not be able to decide to use
> it as a ”Literal“ or a ”StringLiteral“.

Good point.

>
> So I think keeping this rule in current location might confuse the
> ones who want to implement this spec.

Agreed.

/be

>
> Thanks,
> Shaofei Cheng
>
> 2012/2/28 Brendan Eich <brendan at mozilla.org <mailto:brendan at mozilla.org>>
>
>     Indeed this has come up before:
>
>     https://mail.mozilla.org/pipermail/es5-discuss/2011-January/003900.html
>
>     No one replied then, alas.
>
>     There's no normative significance, as Michael Dyck conjectured. It
>     seems we could move Literal. Perhaps Waldemar or Allen has a
>     preference. At this point I am ok with letting the traditional
>     location of Literal stand.
>
>     /be
>
>     程劭非 wrote:
>
>         Hi, everyone,
>
>         I'm working a on ES parser recently and noticed something
>         might be wrong about the symbol “Literal”.
>
>         Since “Literal” and “StringLiteral" "NumericLiteral" appears
>         in lexical grammar , I believe “Literal” should be a
>         non-terminal symbol. Also there is no other rule using
>         “Literal” in lexical grammar. As all above I think the
>         following description is a syntactical grammar rule instead of
>         a lexical grammar rule:
>         /Literal /*::
>         ***/NullLiteral/
>
>         /BooleanLiteral
>         NumericLiteral
>         StringLiteral/
>         /RegularExpressionLiteral/
>
>
>         So my suggest is moving the description from Annex A.1 to
>         Annex A.3
>
>
>
>         Thanks,
>         Shaofei Cheng
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