Expression AST and parser

Deleted old AST.hs; old code shall re-appear.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/Language/SimpleShell/AST/Expr.hs b/src/Language/SimpleShell/AST/Expr.hs
new file mode 100644
index 0000000..0aaf16d
--- /dev/null
+++ b/src/Language/SimpleShell/AST/Expr.hs
@@ -0,0 +1,47 @@
+module Language.SimpleShell.AST.Expr
+  ( Expr(..)
+  , TypedExpr
+  , VarName
+  , FunName
+  )
+where
+
+
+import Language.SimpleShell.AST.SimpleType (SimpleType)
+
+import Data.Text (Text)
+
+
+type VarName = Text
+type FunName = Text
+
+
+-- | Pure expression (no side effects).
+data Expr
+  = IntLiteral Integer
+  | StrLiteral String
+  | BoolLiteral Bool
+  | Var VarName
+  | FunCall FunName [Expr]
+  | And Expr Expr
+  | Or  Expr Expr
+  | Not Expr
+  | Eq  Expr Expr
+  | Neq Expr Expr
+  | Gt  Expr Expr
+  | Ge  Expr Expr
+  | Lt  Expr Expr
+  | Le  Expr Expr
+  | Add Expr Expr
+  | Sub Expr Expr
+  | Mul Expr Expr
+  | Div Expr Expr
+  | UMinus Expr
+  | Concat Expr Expr
+  | Ternary Expr Expr Expr
+  | Length Expr
+  | IntCast Expr
+  | StrCast Expr
+ deriving (Show)
+
+type TypedExpr = (SimpleType, Expr)