# 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
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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from m5.util import code_formatter

from slicc.generate import html
from slicc.symbols.StateMachine import StateMachine
from slicc.symbols.Type import Type
from slicc.util import Location

class SymbolTable(object):
    def __init__(self):
        self.sym_vec = []
        self.sym_map_vec = [ {} ]
        self.machine_components = {}

        pairs = {}
        pairs["enumeration"] = "yes"
        MachineType = Type(self, "MachineType", Location("init", 0), pairs)
        self.newSymbol(MachineType)

        pairs = {}
        pairs["primitive"] = "yes"
        pairs["external"] = "yes"
        void = Type(self, "void", Location("init", 0), pairs)
        self.newSymbol(void)

    def __repr__(self):
        return "[SymbolTable]" # FIXME

    def newSymbol(self, sym):
        self.registerSym(str(sym), sym)
        self.sym_vec.append(sym)

    def registerSym(self, id, sym):
        # Check for redeclaration (in the current frame only)
        if id in self.sym_map_vec[-1]:
            sym.error("Symbol '%s' redeclared in same scope.", id)

        # FIXME - warn on masking of a declaration in a previous frame
        self.sym_map_vec[-1][id] = sym

    def find(self, ident, types=None):
        for sym_map in reversed(self.sym_map_vec):
            try:
                symbol = sym_map[ident]
            except KeyError:
                continue

            if types is not None:
                if not isinstance(symbol, types):
                    symbol.error("Symbol '%s' is not of types '%s'.",
                                 symbol,
                                 types)

            return symbol

        return None

    def newMachComponentSym(self, symbol):
        # used to cheat-- that is, access components in other machines
        machine = self.find("current_machine", StateMachine)
        if machine:
            self.machine_components[str(machine)][str(symbol)] = symbol

    def newCurrentMachine(self, sym):
        self.registerGlobalSym(str(sym), sym)
        self.registerSym("current_machine", sym)
        self.sym_vec.append(sym)

        self.machine_components[str(sym)] = {}

    @property
    def state_machine(self):
        return self.find("current_machine", StateMachine)

    def pushFrame(self):
        self.sym_map_vec.append({})

    def popFrame(self):
        assert len(self.sym_map_vec) > 0
        self.sym_map_vec.pop()

    def registerGlobalSym(self, ident, symbol):
        # Check for redeclaration (global frame only)
        if ident in self.sym_map_vec[0]:
            symbol.error("Symbol '%s' redeclared in global scope." % ident)

        self.sym_map_vec[0][ident] = symbol

    def getAllType(self, type):
        for symbol in self.sym_vec:
            if isinstance(symbol, type):
                yield symbol

    def writeCodeFiles(self, path):
        code = code_formatter()
        code('''
/** Auto generated C++ code started by $__file__:$__line__ */

#include "mem/ruby/slicc_interface/RubySlicc_includes.hh"
''')
        for symbol in self.sym_vec:
            if isinstance(symbol, Type) and not symbol.isPrimitive:
                code('#include "mem/protocol/${{symbol.c_ident}}.hh"')

        code.write(path, "Types.hh")

        for symbol in self.sym_vec:
            symbol.writeCodeFiles(path)

    def writeHTMLFiles(self, path):
        machines = list(self.getAllType(StateMachine))
        if len(machines) > 1:
            name = "%s_table.html" % machines[0].ident
        else:
            name = "empty.html"

        code = code_formatter()
        code('''
<html>
<head>
<title>$path</title>
</head>
<frameset rows="*,30">
    <frame name="Table" src="$name">
    <frame name="Status" src="empty.html">
</frameset>
</html>
''')
        code.write(path, "index.html")

        code = code_formatter()
        code("<HTML></HTML>")
        code.write(path, "empty.html")

        for symbol in self.sym_vec:
            symbol.writeHTMLFiles(path)

__all__ = [ "SymbolTable" ]