# Copyright (c) 2011 Advanced Micro Devices, Inc.
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from slicc.ast.TypeFieldAST import TypeFieldAST
from slicc.symbols import Event, State

class TypeFieldStateAST(TypeFieldAST):
    def __init__(self, slicc, field_id, perm_ast, pairs_ast):
        super(TypeFieldStateAST, self).__init__(slicc, pairs_ast)

        self.field_id = field_id
        self.perm_ast = perm_ast
        if not (perm_ast.type_ast.ident == "AccessPermission"):
            self.error("AccessPermission enum value must be specified")
        self.pairs_ast = pairs_ast

    def __repr__(self):
        return "[TypeFieldState: %r]" % self.field_id

    def generate(self, type):
        if not str(type) == "State":
            self.error("State Declaration must be of type State.")

        # Add enumeration
        if not type.addEnum(self.field_id, self.pairs_ast.pairs):
            self.error("Duplicate enumeration: %s:%s" % (type, self.field_id))

        # Fill machine info
        machine = self.symtab.state_machine

        if not machine:
            self.error("State declaration not part of a machine.")
        s = State(self.symtab, self.field_id, self.location, self.pairs)
        machine.addState(s)

        type.statePermPairAdd(s, self.perm_ast.value)