New rules implemented. The build works unmodified.
Tests still running but most work.
Examples: you will need to look closely.
//////////////////////////////////////////////////////
// test new pattern rules
proc showx (x:opt[int])
{
match x with
| Some a => println$ a;
| None => println$ "None";
endmatch;
}
proc showx2 (x:opt[int])
{
match x with
| Some ?a => println$ a;
| #None => println$ "None";
endmatch;
}
showx (Some 1);
showx (None[int]);
showx2 (Some 2);
showx2 (None[int]);
proc showy (x:opt[opt[int]])
{
match x with
| Some (Some a) => println$ "Some (Some "+str a+"))";
| Some #None => println$ "Some None";
| None => println$ "None";
endmatch;
}
showy (Some (Some 22));
showy (Some None[int]);
showy (None[opt[int]]);
//////////////////////////////
This is implemented and supposed to work but doesn't parse:
//////////////////////
open class My
{
union MyOpt[T] = | MyNone | MySome of T;
}
proc showz (x:MyOpt[MyOpt[int]])
{
match x with
| MySome (MySome a) => println$ "MySome (MySome "+str a+"))";
| MySome My::MyNone => println$ "MySome MyNone";
| MyNone => println$ "MyNone";
endmatch;
}
showz (MySome (MySome 22));
showz (MySome MyNone[int]);
showz (MyNone[MyOpt[int]]);
//////////////////////
this line gives an error:
~/felix>build/release/bin/flx --test=build/release tp
/Users/johnskaller/felix/tp.flx: line 49, cols 14 to 13
48: | MySome (MySome a) => println$ "MySome (MySome "+str a+"))";
49: | MySome My::MyNone => println$ "MySome MyNone";
*
50: | MyNone => println$ "MyNone";
Fatal error: exception Dyp.Syntax_errorThe idea here is simply that
MyOpt::MyNone, being a really
qualified name with :: in it, cannot be a pattern match variable,
which has to be a simple identifier.
The distinction is made in these grammar rules:
sargument_pattern := sname =># "`(pat_as ,_sr (pat_any ,_sr) ,_1)";
sargument_pattern := sreally_qualified_name =># "`(pat_const_ctor ,_sr ,_1)";
and the first case works. So I'm not clear why the second case doesn't also.
The expression grammar reads:
//$ Qualified name.
sreally_qualified_name := squalified_name "::" ssimple_name_parts =>#
"`(ast_lookup (,_1 ,(first _3) ,(second _3)))";
squalified_name := sreally_qualified_name =># '_1';
squalified_name := ssimple_name_parts =>#
"`(ast_name ,_sr ,(first _1) ,(second _1))";
ssimple_name_parts := sname =># "`(,_1 ())";
ssimple_name_parts := sname "[" sexpr "]" =># "`(,_1 ,(mkl _3))";
and I think this has to be right (or all hell would break loose).
--
john skaller
[email protected]
http://felix-lang.org
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