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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_Dafsa_h
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#define mozilla_Dafsa_h
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#include "stdint.h"
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#include "mozilla/Span.h"
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#include "nsStringFwd.h"
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namespace mozilla {
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/**
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* A deterministic acyclic finite state automaton suitable for storing static
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* dictionaries of tagged ascii strings. Consider using this if you have a very
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* large set of strings that need an associated enum value.
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*
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* Currently the string tag is limited by `make_dafsa.py` to a value of [0-4].
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* In theory [0-15] can easily be supported.
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*
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* See `make_dafsa.py` for more details.
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*/
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class Dafsa {
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public:
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using Graph = Span<const uint8_t>;
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/**
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* Initializes the DAFSA with a binary encoding generated by `make_dafsa.py`.
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*/
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explicit Dafsa(const Graph& aData) : mData(aData) {}
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~Dafsa() = default;
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/**
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* Searches for the given string in the DAFSA.
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*
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* @param aKey The string to search for.
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* @returns kKeyNotFound if not found, otherwise the associated tag.
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*/
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int Lookup(const nsACString& aKey) const;
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static const int kKeyNotFound;
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private:
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const Graph mData;
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};
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} // namespace mozilla
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#endif // mozilla_Dafsa_h
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