implementation module Sil.Error

import StdFile
import StdString

import Text

import Sil.Syntax
import Sil.Types
import Sil.Util.Parser

:: ErrorPosition =
	{ ep_line :: Int
	}

instance toString ErrorPosition
where
	toString ep = ep.ep_line <+ ":\t"

instance toString Error
where
	toString (P_Invalid                     w tk)  = "Invalid token '" <+ tk <+ "' while parsing a " <+ w <+ "."
	toString (P_Expected                    s)     = "Expected " <+ s <+ "."
	toString (T_IllegalApplication          ft et) = "Cannot apply a " <+ et <+ " to a " <+ ft <+ "."
	toString (T_IllegalField                f t)   = "Illegal field '" <+ f <+ "' on type " <+ t <+ "."
	toString (T_TooHighTupleArity           i)     = "Too high tuple arity " <+ i <+ " (maximum is 32)."
	toString  Ck_NoMainFunction                    = "Error: no main function."
	toString (Ck_MainFunctionInvalidType  p t)     = p <+ "Error: function 'main' should not have arguments has type " <+ t <+ "."
	toString (Ck_DuplicateFunctionName    p n)     = p <+ "Error: multiply defined: '" <+ n <+ "'."
	toString (Ck_DuplicateLocalName       p f arg) = p <+ "Error: multiply defined: '" <+ arg <+ "' in '" <+ f <+ "'."
	toString (Ck_ReturnExpressionFromVoid p f)     = p <+ "Type error: an expression was returned from void function '" <+ f <+ "'."
	toString (Ck_NoReturnFromNonVoid      p f)     = p <+ "Type error: no return from non-void function '" <+ f <+ "'."
	toString (Ck_LocalVoid                  f l)   = "Type error: local variable '" <+ l <+ "' in '" <+ f <+ "' cannot have type Void."
	toString (Ck_BasicGlobal              p g)     = p <+ "Error: global variable '" <+ g <+ "' cannot have a basic type."
	toString (C_UndefinedName               n)     = "Undefined name '" <+ n <+ "'."
	toString (C_UndefinedField              f)     = "Undefined field '" <+ f <+ "'."
	toString  C_VariableLabel                      = "Variable stored at label."
	toString  C_FunctionOnStack                    = "Function stored on the stack."
	toString (C_CouldNotDeduceType          e)     = "Could not deduce type of '" <+ e <+ "'."
	toString (C_TypeMisMatch                t e u) = "Type mismatch: expected " <+ t <+ " for '" <+ e <+ "'; had " <+ u <+ "."
	toString (C_BasicInitWithoutValue       n)     = "Basic value '" <+ n <+ "' must have an initial value."
	toString (UnknownError                  e)     = "Unknown error: " <+ e <+ "."

instance <<< Error where <<< f e = f <<< toString e <<< "\r\n"

errpos :: (Positioned a) -> ErrorPosition
errpos p = {ep_line=p.pos_line}