From 14ad0667bf25351e522faa7d9fbb3ff31619d92e Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Wed, 14 Oct 2020 19:35:12 +0530
Subject: add support for vectors a

---
 src/Evaluator.hs |  9 +++++----
 src/Parser.hs    | 14 ++++++++++++--
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/Evaluator.hs b/src/Evaluator.hs
index b0171ba..8a5274f 100644
--- a/src/Evaluator.hs
+++ b/src/Evaluator.hs
@@ -16,10 +16,11 @@ apply fn args = maybe
     (lookup fn primitives)
 
 eval :: Expr -> LispResult Expr
-eval v@(StringLiteral s)     = return v
-eval v@(IntLiteral i)        = return v
-eval v@(BoolLiteral b)       = return v
-eval v@(FloatLiteral f)      = return v
+eval v@(StringLiteral s) = return v
+eval v@(IntLiteral i)    = return v
+eval v@(BoolLiteral b)   = return v
+eval v@(FloatLiteral f)  = return v
+eval v@(Vector xs)       = liftM Vector $ mapM eval xs
 -- handle quotes as literals
 eval (List[Id "quote", val])      = return val
 eval (List[Id "quasiquote", val]) = undefined
diff --git a/src/Parser.hs b/src/Parser.hs
index dc754d3..69197b8 100644
--- a/src/Parser.hs
+++ b/src/Parser.hs
@@ -15,6 +15,7 @@ import           Text.ParserCombinators.Parsec
 -- TODO: add character literals: \#a \#b \#c \#space \#newline
 -- TODO: add support for complex numbers, oct and hex numbers
 data Expr = List [Expr]
+          | Vector [Expr]
           | DottedList [Expr] Expr
           | StringLiteral String
           | IntLiteral Integer
@@ -55,8 +56,15 @@ parseFloat = do
     let fval = characteristic ++ "." ++ mantissa
     return $ (FloatLiteral . read) $ maybe fval (:fval) sign
 
+parseVector :: Parser Expr
+parseVector = do
+    string "#(" >> optionalWhiteSpace
+    x <- sepEndBy parseLispValue whiteSpace
+    optionalWhiteSpace >> char ')'
+    return $ Vector x
+
 symbol :: Parser Char
-symbol = oneOf "!#$%&|*+:/-=<?>@^_~"
+symbol = oneOf "!$%&|*+:/-=<?>@^_~"
 
 parseId :: Parser Expr
 parseId = do
@@ -95,9 +103,10 @@ parseLispValue =
     <|> parseQuote
     <|> parseQuasiquote
     <|> parseUnquote
+    <|> parseVector
     -- handles lists and dotted lists
     <|> do
-        char '(' >> spaces
+        char '(' >> optionalWhiteSpace
         x <- sepEndBy parseLispValue whiteSpace
         spaces
         t <- optionMaybe $ char '.' >> space >> parseLispValue
@@ -111,6 +120,7 @@ showLispList = unwords . map show
 instance Show Expr where
     show (DottedList xs x)   = "(" ++ showLispList xs ++ " . " ++ show x ++ ")"
     show (List xs)           = "(" ++ showLispList xs ++ ")"
+    show (Vector xs)         = "#(" ++ showLispList xs ++ ")"
     show (StringLiteral s)   = "\"" ++ s ++ "\""
     show (IntLiteral n)      = show n
     show (FloatLiteral n)    = show n
-- 
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