Re: In D, lexically, which are the chars that can follow $, exactly ?

[Basile B. via Digitalmars-d-learn]

On Sunday, 13 March 2016 at 14:55:36 UTC, Marc Schütz wrote:

On Sunday, 13 March 2016 at 14:07:31 UTC, Basile B. wrote:
'$' is only valid in an indexExpression 
(https://dlang.org/spec/grammar.html#IndexExpression),

so it can only be followed by

- ' '
- ']'
-  operators , usually '-' but also '/', '+', '>>' etc

Is that right ?

I'd like to relax the lexical rule for C.E static macros which 
currently is


- "^\$\w*[a-zA-Z]$", so for example "$a1A" is valid and "$a1" 
is not.


But it looks like for example "$)" or "$}" wouldn't be 
ambiguous since it's not possible in D.


I don't know what C.E is, but `$` is an expansion of 
`PrimaryExpression`, which means it can (syntactically) appear 
anywhere a `PrimaryExpression` is allowed. For example, this 
compiles:


void main() {
int[] a;
a[0 .. ($)] = 0;
}


Then the C.E macros syntax can't be enhanced. At least the 
current is not ambiguous.


The thing is that a macro is substitued automatically/dynamically 
so the requirement is that nothing that's syntaxically valid in D 
must replacable.

Re: In D, lexically, which are the chars that can follow $, exactly ?

[Marc Schütz via Digitalmars-d-learn]

On Sunday, 13 March 2016 at 14:07:31 UTC, Basile B. wrote:
'$' is only valid in an indexExpression 
(https://dlang.org/spec/grammar.html#IndexExpression),

so it can only be followed by

- ' '
- ']'
-  operators , usually '-' but also '/', '+', '>>' etc

Is that right ?

I'd like to relax the lexical rule for C.E static macros which 
currently is


- "^\$\w*[a-zA-Z]$", so for example "$a1A" is valid and "$a1" 
is not.


But it looks like for example "$)" or "$}" wouldn't be 
ambiguous since it's not possible in D.


I don't know what C.E is, but `$` is an expansion of 
`PrimaryExpression`, which means it can (syntactically) appear 
anywhere a `PrimaryExpression` is allowed. For example, this 
compiles:


void main() {
int[] a;
a[0 .. ($)] = 0;
}

In D, lexically, which are the chars that can follow $, exactly ?

[Basile B. via Digitalmars-d-learn]

'$' is only valid in an indexExpression 
(https://dlang.org/spec/grammar.html#IndexExpression),

so it can only be followed by

- ' '
- ']'
-  operators , usually '-' but also '/', '+', '>>' etc

Is that right ?

I'd like to relax the lexical rule for C.E static macros which 
currently is


- "^\$\w*[a-zA-Z]$", so for example "$a1A" is valid and "$a1" is 
not.


But it looks like for example "$)" or "$}" wouldn't be ambiguous 
since it's not possible in D.