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# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
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from slicc.ast.DeclAST import DeclAST
from slicc.ast.TypeAST import TypeAST
from slicc.symbols import Func, Type, Var

class InPortDeclAST(DeclAST):
    def __init__(self, slicc, ident, msg_type, var_expr, pairs, statements):
        super().__init__(slicc, pairs)

        self.ident = ident
        self.msg_type = msg_type
        self.var_expr = var_expr
        self.statements = statements
        self.queue_type = TypeAST(slicc, "InPort")

    def __repr__(self):
        return "[InPortDecl: %s]" % self.ident

    def generate(self):
        symtab = self.symtab
        void_type = symtab.find("void", Type)

        machine = symtab.state_machine
        if machine is None:
            self.error("InPort declaration not part of a machine.")

        code = self.slicc.codeFormatter()
        queue_type = self.var_expr.generate(code)
        if not queue_type.isInPort:
            self.error("The inport queue's type must have the 'inport' " + \
                       "attribute.  Type '%s' does not have this attribute.",
                       queue_type)

        type = self.queue_type.type
        self.pairs["buffer_expr"] = self.var_expr
        in_port = Var(self.symtab, self.ident, self.location, type, str(code),
                      self.pairs, machine)
        symtab.newSymbol(in_port)

        symtab.pushFrame()
        param_types = []

        # Check for Event
        type = symtab.find("Event", Type)
        if type is None:
            self.error("in_port decls require 'Event' enumeration defined")
        param_types.append(type)

        # Check for Address
        type = symtab.find("Addr", Type)
        if type is None:
            self.error("in_port decls require 'Addr' type to be defined")

        param_types.append(type)

        if machine.EntryType != None:
            param_types.append(machine.EntryType)
        if machine.TBEType != None:
            param_types.append(machine.TBEType)

        # Add the trigger method - FIXME, this is a bit dirty
        pairs = { "external" : "yes" }
        trigger_func_name = "trigger"
        for param in param_types:
            trigger_func_name += "_" + param.ident
        func = Func(self.symtab, trigger_func_name, "trigger", self.location,
                    void_type, param_types, [], "", pairs)
        symtab.newSymbol(func)

        # Add the stallPort method - this hacks reschedules the controller
        # for stalled messages that don't trigger events
        func = Func(self.symtab, "stallPort", "stallPort", self.location,
                    void_type, [], [], "", pairs)
        symtab.newSymbol(func)

        param_types = []
        # Check for Event2
        type = symtab.find("Event", Type)
        if type is None:
            self.error("in_port decls require 'Event' enumeration")

        param_types.append(type)

        # Check for Address2
        type = symtab.find("Addr", Type)
        if type is None:
            self.error("in_port decls require 'Addr' type to be defined")

        param_types.append(type)

        if self.statements is not None:
            rcode = self.slicc.codeFormatter()
            rcode.indent()
            rcode.indent()
            self.statements.generate(rcode, None, in_port=in_port)
            in_port["c_code_in_port"] = str(rcode)

        symtab.popFrame()

        # Add port to state machine
        machine.addInPort(in_port)