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# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
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from slicc.ast.AST import AST
from slicc.symbols import Var


class FormalParamAST(AST):
    def __init__(self, slicc, type_ast, ident, default=None, qualifier=""):
        super().__init__(slicc)
        self.type_ast = type_ast
        self.ident = ident
        self.default = default
        self.qualifier = qualifier

    def __repr__(self):
        return f"[FormalParamAST: {self.ident}]"

    @property
    def name(self):
        return self.ident

    def generate(self):
        type = self.type_ast.type
        param = f"param_{self.ident}"

        # Add to symbol table
        v = Var(
            self.symtab, self.ident, self.location, type, param, self.pairs
        )
        self.symtab.newSymbol(v)

        # Qualifier is always a pointer for TBE table and Cache entries.
        # It's expected to be left unspecified or specified as ptr.
        qualifier = self.qualifier
        if str(type) == "TBE" or (
            "interface" in type and (type["interface"] == "AbstractCacheEntry")
        ):
            if qualifier not in ["", "PTR"]:
                self.warning(
                    "Parameter '%s' is always pointer. "
                    "%s qualifier ignored" % (self.ident, qualifier)
                )
            qualifier = "PTR"

        # default
        if qualifier == "":
            qualifier = "CONST_REF"

        if qualifier == "PTR":
            return type, f"{type.c_ident}* {param}"
        elif qualifier == "REF":
            return type, f"{type.c_ident}& {param}"
        elif qualifier == "CONST_REF":
            return type, f"const {type.c_ident}& {param}"
        else:
            self.error(f"Invalid qualifier for param '{self.ident}'")