// Copyright 2017-2020 The Verible Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Contains a suite of functions for comparing to SyntaxTrees

#ifndef VERIBLE_COMMON_TEXT_TREE_COMPARE_H_
#define VERIBLE_COMMON_TEXT_TREE_COMPARE_H_

#include <functional>

#include "common/text/symbol.h"
#include "common/text/token_info.h"

namespace verible {

using TokenComparator = std::function<bool(const TokenInfo&, const TokenInfo&)>;

// Compares two SyntaxTrees. Two trees are equal if they have the same
// structure and every TokenInfo is equal under compare_tokens.
bool EqualTrees(const Symbol* lhs, const Symbol* rhs,
                const TokenComparator& compare_tokens);
// Compare two syntax trees exactly, using TokenInfo equality.
bool EqualTrees(const Symbol* lhs, const Symbol* rhs);

// Compares two tree using the EqualTrees with the EqualByEnum function
bool EqualTreesByEnum(const Symbol* lhs, const Symbol* rhs);

// compare two trees using EqualTrees with the EqualByEnumString function
bool EqualTreesByEnumString(const Symbol* lhs, const Symbol* rhs);

// Compare two TokenInfo by their enum
bool EqualByEnum(const TokenInfo& lhs, const TokenInfo& rhs);

// Compare two TokenInfo by both enum and text
bool EqualByEnumString(const TokenInfo& lhs, const TokenInfo& rhs);

}  // namespace verible

#endif  // VERIBLE_COMMON_TEXT_TREE_COMPARE_H_