# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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from slicc.ast.ExprAST import ExprAST

class MemberExprAST(ExprAST):
    def __init__(self, slicc, expr_ast, field):
        super(MemberExprAST, self).__init__(slicc)

        self.expr_ast = expr_ast
        self.field = field

    def __repr__(self):
        return "[MemberExprAST: %r.%r]" % (self.expr_ast, self.field)

    def generate(self, code):
        return_type, gcode = self.expr_ast.inline(True)
        fix = code.nofix()

        if str(return_type) == "TBE" or ("interface" in return_type and return_type["interface"] == "AbstractCacheEntry"):
            code("(*$gcode).m_${{self.field}}")
        else:
            code("($gcode).m_${{self.field}}")

        code.fix(fix)

        # Verify that this is a valid field name for this type
        if self.field not in return_type.data_members:
            self.error("Invalid object field: " +
                       "Type '%s' does not have data member %s" % \
                       (return_type, self.field))

        # Return the type of the field
        return return_type.data_members[self.field].type
