# HG changeset patch
# User unc0rr
# Date 1320351142 -10800
# Node ID 13262c6e5027840c59bf5a4ff98f4821b958067f
# Parent  a93cb9ca9fda289aa50a17e1c4bb14fdf01420f7
Starting pas2C using library called 'pretty'

diff -r a93cb9ca9fda -r 13262c6e5027 tools/pas2c.hs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/pas2c.hs	Thu Nov 03 23:12:22 2011 +0300
@@ -0,0 +1,67 @@
+module Pas2C where
+
+import PascalParser
+import Text.PrettyPrint.HughesPJ
+import Data.Maybe
+
+
+pascal2C :: PascalUnit -> Doc
+pascal2C (Unit unitName interface implementation init fin) = implementation2C implementation
+
+
+implementation2C :: Implementation -> Doc
+implementation2C (Implementation uses tvars) = typesAndVars2C tvars
+
+
+typesAndVars2C :: TypesAndVars -> Doc
+typesAndVars2C (TypesAndVars ts) = vcat $ map tvar2C ts
+
+
+tvar2C :: TypeVarDeclaration -> Doc
+tvar2C (FunctionDeclaration (Identifier name) (Identifier returnType) Nothing) = 
+    text $ maybeVoid returnType ++ " " ++ name ++ "();"
+
+    
+tvar2C (FunctionDeclaration (Identifier name) (Identifier returnType) (Just phrase)) = 
+    text (maybeVoid returnType ++ " " ++ name ++ "()") 
+    $$
+    phrase2C phrase
+tvar2C _ = empty
+
+
+phrase2C :: Phrase -> Doc
+phrase2C (Phrases p) = braces . nest 4 . vcat . map phrase2C $ p
+phrase2C (ProcCall (Identifier name) params) = text name <> parens (hsep . punctuate (char ',') . map expr2C $ params) <> semi
+phrase2C (IfThenElse (expr) phrase1 mphrase2) = text "if" <> parens (expr2C expr) $$ (braces . nest 4 . phrase2C) phrase1 <+> elsePart
+    where
+    elsePart | isNothing mphrase2 = empty
+             | otherwise = text "else" $$ (braces . nest 4 . phrase2C) (fromJust mphrase2)
+phrase2C (Assignment (Identifier name) expr) = text name <> text " = " <> expr2C expr <> semi
+phrase2C (WhileCycle expr phrase) = text "while" <> parens (expr2C expr) $$ nest 4 (phrase2C phrase)
+phrase2C (SwitchCase expr cases mphrase) = text "switch" <> parens (expr2C expr) <> text "of" $$ (nest 4 . vcat . map case2C) cases
+    where
+    case2C :: (Expression, Phrase) -> Doc
+    case2C (e, p) = text "case" <+> parens (expr2C e) <> char ':' <> nest 4 (phrase2C p $$ text "break;")
+{-
+        | RepeatCycle Expression Phrase
+        | ForCycle
+        | SwitchCase Expression [(Expression, Phrase)] (Maybe Phrase)
+        | Assignment Identifier Expression
+        -}
+phrase2C _ = empty
+
+
+expr2C :: Expression -> Doc
+expr2C (Expression s) = text s
+expr2C (FunCall (Identifier name) params) = text name <> parens (hsep . punctuate (char ',') . map expr2C $ params)
+expr2C (BinOp op expr1 expr2) = (expr2C expr1) <+> op2C op <+> (expr2C expr2)
+{-    | FunCall Identifier [Expression]
+    | PrefixOp String Expression
+    | BinOp String Expression Expression
+    -}            
+expr2C _ = empty
+
+op2C = text
+
+maybeVoid "" = "void"
+maybeVoid a = a