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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
#pragma once
#include "TokenSource.h"
#include "CommonTokenFactory.h"
namespace antlr4 {
/// Provides an implementation of <seealso cref="TokenSource"/> as a wrapper around a list
/// of <seealso cref="Token"/> objects.
///
/// If the final token in the list is an <seealso cref="Token#EOF"/> token, it will be used
/// as the EOF token for every call to <seealso cref="#nextToken"/> after the end of the
/// list is reached. Otherwise, an EOF token will be created.
class ANTLR4CPP_PUBLIC ListTokenSource : public TokenSource {
protected:
// This list will be emptied token by token as we call nextToken().
// Token streams can be used to buffer tokens for a while.
std::vector<std::unique_ptr<Token>> tokens;
private:
/// <summary>
/// The name of the input source. If this value is {@code null}, a call to
/// <seealso cref="#getSourceName"/> should return the source name used to create the
/// the next token in <seealso cref="#tokens"/> (or the previous token if the end of
/// the input has been reached).
/// </summary>
const std::string sourceName;
protected:
/// The index into <seealso cref="#tokens"/> of token to return by the next call to
/// <seealso cref="#nextToken"/>. The end of the input is indicated by this value
/// being greater than or equal to the number of items in <seealso cref="#tokens"/>.
size_t i;
private:
/// This is the backing field for <seealso cref="#getTokenFactory"/> and
/// <seealso cref="setTokenFactory"/>.
TokenFactory<CommonToken> *_factory = CommonTokenFactory::DEFAULT.get();
public:
/// Constructs a new <seealso cref="ListTokenSource"/> instance from the specified
/// collection of <seealso cref="Token"/> objects.
///
/// <param name="tokens"> The collection of <seealso cref="Token"/> objects to provide as a
/// <seealso cref="TokenSource"/>. </param>
/// <exception cref="NullPointerException"> if {@code tokens} is {@code null} </exception>
ListTokenSource(std::vector<std::unique_ptr<Token>> tokens);
ListTokenSource(const ListTokenSource& other) = delete;
ListTokenSource& operator = (const ListTokenSource& other) = delete;
/// <summary>
/// Constructs a new <seealso cref="ListTokenSource"/> instance from the specified
/// collection of <seealso cref="Token"/> objects and source name.
/// </summary>
/// <param name="tokens"> The collection of <seealso cref="Token"/> objects to provide as a
/// <seealso cref="TokenSource"/>. </param>
/// <param name="sourceName"> The name of the <seealso cref="TokenSource"/>. If this value is
/// {@code null}, <seealso cref="#getSourceName"/> will attempt to infer the name from
/// the next <seealso cref="Token"/> (or the previous token if the end of the input has
/// been reached).
/// </param>
/// <exception cref="NullPointerException"> if {@code tokens} is {@code null} </exception>
ListTokenSource(std::vector<std::unique_ptr<Token>> tokens_, const std::string &sourceName_);
virtual size_t getCharPositionInLine() override;
virtual std::unique_ptr<Token> nextToken() override;
virtual size_t getLine() const override;
virtual CharStream* getInputStream() override;
virtual std::string getSourceName() override;
template<typename T1>
void setTokenFactory(TokenFactory<T1> *factory) {
this->_factory = factory;
}
virtual TokenFactory<CommonToken>* getTokenFactory() override;
private:
void InitializeInstanceFields();
};
} // namespace antlr4
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