ExprArg.zu

#
# The Zimbu compiler written in Zimbu
#
# ExprArg class: arguments for expressions.
#
# Copyright 2010 Bram Moolenaar  All Rights Reserved.
# Licensed under the Apache License, Version 2.0.  See the LICENSE file or
# obtain a copy at: http://www.apache.org/licenses/LICENSE-2.0

IMPORT "Declaration.zu"
IMPORT "Type.zu"

CLASS ExprArg @items=public                   # TODO: restrict visibility
  Declaration $dest      # destination, including desired type of result

  bool   $stringConvert  # convert int/bool/status to string
  bool   $exactMatch     # no conversion between class and object, func and
                         # funcRef, etc.
  int    $undef          # count undefined types

  bool   $top            # Toplevel expression: RHS of assignment or function
                         # argument.

  NEW(Declaration dest, bool stringConvert)
    $dest = dest
    $stringConvert = stringConvert
  }

  # Create a new object without a destination type set.
  NEW(bool stringConvert)
    $stringConvert = stringConvert
  }

  FUNC $destType() Type
    IF $dest == NIL
      RETURN NIL
    }
    RETURN $dest.type
  }

  FUNC $copy() ExprArg
    ExprArg r = NEW($dest, $stringConvert)
    r.exactMatch = $exactMatch
    r.undef = $undef
    r.top = $top
    RETURN r
  }
}