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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 "ProxyErrorListener.h"
#include "support/Casts.h"
#include "atn/SerializedATNView.h"
#include "internal/Synchronization.h"
namespace antlr4 {
class ANTLR4CPP_PUBLIC Recognizer {
public:
static constexpr size_t EOF = std::numeric_limits<size_t>::max();
Recognizer();
Recognizer(Recognizer const&) = delete;
virtual ~Recognizer();
Recognizer& operator=(Recognizer const&) = delete;
virtual std::vector<std::string> const& getRuleNames() const = 0;
/**
* Get the vocabulary used by the recognizer.
*
* @return A {@link Vocabulary} instance providing information about the
* vocabulary used by the grammar.
*/
virtual dfa::Vocabulary const& getVocabulary() const = 0;
/// <summary>
/// Get a map from token names to token types.
/// <p/>
/// Used for XPath and tree pattern compilation.
/// </summary>
virtual std::map<std::string_view, size_t> getTokenTypeMap();
/// <summary>
/// Get a map from rule names to rule indexes.
/// <p/>
/// Used for XPath and tree pattern compilation.
/// </summary>
virtual std::map<std::string, size_t> getRuleIndexMap();
virtual size_t getTokenType(std::string_view tokenName);
/// <summary>
/// If this recognizer was generated, it will have a serialized ATN
/// representation of the grammar.
/// <p/>
/// For interpreters, we don't know their serialized ATN despite having
/// created the interpreter from it.
/// </summary>
virtual atn::SerializedATNView getSerializedATN() const {
throw "there is no serialized ATN";
}
/// <summary>
/// For debugging and other purposes, might want the grammar name.
/// Have ANTLR generate an implementation for this method.
/// </summary>
virtual std::string getGrammarFileName() const = 0;
/// Get the ATN interpreter (in fact one of it's descendants) used by the recognizer for prediction.
/// @returns The ATN interpreter used by the recognizer for prediction.
template <class T>
T* getInterpreter() const {
return antlrcpp::downCast<T *>(_interpreter);
}
/**
* Set the ATN interpreter used by the recognizer for prediction.
*
* @param interpreter The ATN interpreter used by the recognizer for
* prediction.
*/
void setInterpreter(atn::ATNSimulator *interpreter);
/// What is the error header, normally line/character position information?
virtual std::string getErrorHeader(RecognitionException *e);
/** How should a token be displayed in an error message? The default
* is to display just the text, but during development you might
* want to have a lot of information spit out. Override in that case
* to use t.toString() (which, for CommonToken, dumps everything about
* the token). This is better than forcing you to override a method in
* your token objects because you don't have to go modify your lexer
* so that it creates a new Java type.
*
* @deprecated This method is not called by the ANTLR 4 Runtime. Specific
* implementations of {@link ANTLRErrorStrategy} may provide a similar
* feature when necessary. For example, see
* {@link DefaultErrorStrategy#getTokenErrorDisplay}.
*/
virtual std::string getTokenErrorDisplay(Token *t);
/// <exception cref="NullPointerException"> if {@code listener} is {@code null}. </exception>
virtual void addErrorListener(ANTLRErrorListener *listener);
virtual void removeErrorListener(ANTLRErrorListener *listener);
virtual void removeErrorListeners();
virtual ProxyErrorListener& getErrorListenerDispatch();
// subclass needs to override these if there are sempreds or actions
// that the ATN interp needs to execute
virtual bool sempred(RuleContext *localctx, size_t ruleIndex, size_t actionIndex);
virtual bool precpred(RuleContext *localctx, int precedence);
virtual void action(RuleContext *localctx, size_t ruleIndex, size_t actionIndex);
size_t getState() const { return _stateNumber; }
// Get the ATN used by the recognizer for prediction.
virtual const atn::ATN& getATN() const = 0;
/// <summary>
/// Indicate that the recognizer has changed internal state that is
/// consistent with the ATN state passed in. This way we always know
/// where we are in the ATN as the parser goes along. The rule
/// context objects form a stack that lets us see the stack of
/// invoking rules. Combine this and we have complete ATN
/// configuration information.
/// </summary>
void setState(size_t atnState) { _stateNumber = atnState; }
virtual IntStream* getInputStream() = 0;
virtual void setInputStream(IntStream *input) = 0;
virtual TokenFactory<CommonToken>* getTokenFactory() = 0;
template<typename T1>
void setTokenFactory(TokenFactory<T1> *input);
protected:
atn::ATNSimulator *_interpreter; // Set and deleted in descendants (or the profiler).
// Mutex to manage synchronized access for multithreading.
internal::Mutex _mutex;
private:
static std::map<const dfa::Vocabulary*, std::map<std::string_view, size_t>> _tokenTypeMapCache;
static std::map<std::vector<std::string>, std::map<std::string, size_t>> _ruleIndexMapCache;
ProxyErrorListener _proxListener; // Manages a collection of listeners.
size_t _stateNumber;
void InitializeInstanceFields();
};
} // namespace antlr4
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