On 29/12/10 02:56, Gavin Barraclough wrote:
Hi,
In the definition of OctalEscapeSequence, and in the accompanying semantics, it
is required at numerous points that the subsequent character is not a
DecimalDigit:
OctalEscapeSequence ::
OctalDigit [lookahead ∉ DecimalDigit]
ZeroToThree OctalDigit [lookahead ∉ DecimalDigit]
FourToSeven OctalDigit
ZeroToThree OctalDigit OctalDigit
In these cases it would seem to make more sense to require that the subsequent character
is not an OctalDigit. For example, implementations supporting this additional syntax the
string literal "\019" is permitted (with '\01' matching the rule 'ZeroToThree
OctalDigit').
As such, I think throughout B.1.2. it would make more sense to replace
DecimalDigit with OctalDigit.
Additionally, I believe it would also be helpful to redefine the following rule
(in section B.1.2):
EscapeCharacter ::
SingleEscapeCharacter
DecimalDigit
x
u
Again, replacing DecimalDigit with OctalDigit. This would add documentation
reflecting the fact that in addition to permitting octal escapes
implementations commonly permit '\8\ and '\9' to be handled as
NonEscapeCharacter sequences in string literals.
This has been raised on the list before, most recently at
<https://mail.mozilla.org/pipermail/es5-discuss/2010-February/003490.html>.
Also, with regards to that, see
<https://mail.mozilla.org/pipermail/es-discuss/2010-November/012168.html>.
(I'll follow up on that sometime soon!).
--
Geoffrey Sneddon — Opera Software
<http://gsnedders.com/>
<http://www.opera.com/>
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