Add Bool builtin type, branches, and some more stuff

* obj::Bool builtin type is used for truthiness and decision-making * Branches are compiled and seem to be working for basic integer comparison * Updated version of Shredder to what is current as of writing * CheckTruth VM instruction that will explicitly set the condition flag * Probably some other stuff Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
2020-11-06 16:57:25 -08:00
parent 692bb521ec
commit be9a659159
17 changed files with 435 additions and 78 deletions
--- a/src/syn/parser.y
+++ b/src/syn/parser.y
@@ -104,7 +104,7 @@ AccessExpr -> Result<Expr>:
    ;

 FunExpr -> Result<Expr>:
-        AtomExpr { $1 }
+        IfExpr { $1 }
    |   'fn' '(' FunParams ')' '{' Body '}' { Ok(FunExpr::new_expr($3?, $6?)) }
    ;

@@ -118,6 +118,31 @@ FunParamsTail -> Result<Vec<String>>:
    |   Ident { Ok(vec![$1?]) }
    ;

+IfExpr -> Result<Expr>:
+        AtomExpr { $1 }
+    |   'if' Expr '{' Body '}' Elif El {
+        Ok(IfExpr::new_expr(
+            CondBody { cond: $2?, body: $4?, },
+            $6?,
+            $7?,
+        ))
+    }
+    ;
+
+Elif -> Result<Vec<CondBody>>:
+        Elif 'elif' Expr '{' Body '}' {
+            let mut head = $1?;
+            head.push(CondBody { cond: $3?, body: $5? });
+            Ok(head)
+        }
+    |   { Ok(Vec::new()) }
+    ;
+
+El -> Result<Option<Body>>:
+        'el' '{' Body '}' { $3.map(Some) }
+    |   { Ok(None) }
+    ;
+
 AtomExpr -> Result<Expr>:
        Atom { $1.map(Expr::Atom) }
    |   '(' Expr ')' { $2 }