shithub: mc

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Fix up grammar to only accept valider patterns.

    We don't try to match arbitrary fucking expressions now.

--- a/parse/gram.y

+++ b/parse/gram.y

@@ -123,12 +123,12 @@

 %type <tydef> tydef

-%type <node> exprln retexpr expr atomicexpr literal asnexpr lorexpr landexpr borexpr

-%type <node> bandexpr cmpexpr unioncons addexpr mulexpr shiftexpr prefixexpr postfixexpr

+%type <node> exprln retexpr expr atomicexpr littok literal asnexpr lorexpr landexpr borexpr

+%type <node> bandexpr cmpexpr unionexpr addexpr mulexpr shiftexpr prefixexpr postfixexpr

 %type <node> funclit arraylit name block blockbody stmt label use

 %type <node> decl declbody declcore structelt

 %type <node> ifstmt forstmt whilestmt matchstmt elifs optexprln

-%type <node> pat match

+%type <node> pat unionpat match

 %type <node> castexpr

 %type <ucon> unionelt

@@ -394,16 +394,16 @@

         | castexpr

         ;

-castexpr: unioncons Tcast Toparen type Tcparen

+castexpr: unionexpr Tcast Toparen type Tcparen

             {$$ = mkexpr($1->line, Ocast, $1, NULL);

              $$->expr.type = $4;}

-        | unioncons 

+        | unionexpr 

         ;

 cmpop   : Teq | Tgt | Tlt | Tge | Tle | Tne ;

-unioncons

+unionexpr

         : Ttick Tident borexpr

             {$$ = mkexpr($1->line, Ocons, mkname($2->line, $2->str), $3, NULL);}

         | Ttick Tident

@@ -493,7 +493,10 @@

 literal : funclit       {$$ = $1;}

         | arraylit      {$$ = $1;}

-        | Tstrlit       {$$ = mkstr($1->line, $1->str);}

+        | littok        {$$ = $1;}

+        ;

+

+littok  : Tstrlit       {$$ = mkstr($1->line, $1->str);}

         | Tintlit       {$$ = mkint($1->line, strtol($1->str, NULL, 0));}

         | Tchrlit       {$$ = mkchar($1->line, *$1->str);} /* FIXME: expand escapes, unicode  */

         | Tfloatlit     {$$ = mkfloat($1->line, strtod($1->str, NULL));}

@@ -577,8 +580,15 @@

         | Tendln {$$ = NULL;}

         ;

-pat     : literal {$$ = mkexpr($1->line, Olit, $1, NULL);}

-        | unioncons {$$ = $1;}

+pat     : unionpat {$$ = $1;}

+        | littok {$$ = mkexpr($1->line, Olit, $1, NULL);}

+        | Tident {$$ = mkexpr($1->line, Ovar, mkname($1->line, $1->str), NULL);}

+        ;

+

+unionpat: Ttick Tident pat

+            {$$ = mkexpr($1->line, Ocons, mkname($2->line, $2->str), $3, NULL);}

+        | Ttick Tident

+            {$$ = mkexpr($1->line, Ocons, mkname($2->line, $2->str), NULL);}

         ;

 block   : blockbody Tendblk

-- 

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