Re: Potential flaw in grammar

ken Koch wrote:

> I've been looking over the grammar to test out a parser I've been
> building. I think i may have discovered a small flaw in the grammar
> definition for string literals.
> 
> The problem is in the definition of heredoc-string-literal and
> nowdoc-string literal. The relevant definitions:
> 
> from https://github.com/php/php-langspec/blob/master/spec/19-grammar.md#string-literals:
> 
>  heredoc-string-literal::
>     hd-start-identifier   new-line   hd-char-sequenceopt  new-line
> hd-end-identifier  ;opt   new-line
> 
>   hd-start-identifier::
>     name
> 
>   hd-end-identifier::
>     name
> 
>   nowdoc-string-literal::
>     hd-start-identifier  '  new-line  hd-char-sequenceopt   new-line
> hd-end-identifier  ;opt   new-line

That's a problem with the rendering of the markdown (maybe the markdown
needs some escaping); the raw markdown[1] seems to be correct.

A similar problem can be seen for the relational operators[2]--some of
them seem to be missing.

[1]
<https://raw.githubusercontent.com/php/php-langspec/master/spec/19-grammar.md>
[2]
<https://github.com/php/php-langspec/blob/master/spec/10-expressions.md#user-content-relational-operators>

-- 
Christoph M. Becker