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// Copyright 2013 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <map>
#include <memory>
#include <optional>
#include <string>
#include "InputCommon/ControllerInterface/CoreDevice.h"
namespace ciface::ExpressionParser
{
enum TokenType
{
TOK_WHITESPACE,
TOK_INVALID,
TOK_EOF,
TOK_LPAREN,
TOK_RPAREN,
TOK_NOT,
TOK_CONTROL,
TOK_LITERAL,
TOK_VARIABLE,
TOK_BAREWORD,
TOK_COMMENT,
TOK_HOTKEY,
// Binary Ops:
TOK_BINARY_OPS_BEGIN,
TOK_AND = TOK_BINARY_OPS_BEGIN,
TOK_OR,
TOK_ADD,
TOK_SUB,
TOK_MUL,
TOK_DIV,
TOK_MOD,
TOK_ASSIGN,
TOK_LTHAN,
TOK_GTHAN,
TOK_COMMA,
TOK_XOR,
TOK_BINARY_OPS_END,
};
class Token
{
public:
TokenType type;
std::string data;
// Position in the input string:
std::size_t string_position = 0;
std::size_t string_length = 0;
explicit Token(TokenType type_);
Token(TokenType type_, std::string data_);
bool IsBinaryOperator() const;
};
enum class ParseStatus
{
Successful,
// Note that the expression could still work in this case (be valid and return a value)
SyntaxError,
// Will return the default value
EmptyExpression,
};
class Lexer
{
public:
std::string expr;
std::string::iterator it;
explicit Lexer(std::string expr_);
ParseStatus Tokenize(std::vector<Token>& tokens);
private:
template <typename F>
std::string FetchCharsWhile(F&& func)
{
std::string value;
while (it != expr.end() && func(*it))
{
value += *it;
++it;
}
return value;
}
std::string FetchDelimString(char delim);
std::string FetchWordChars();
Token GetDelimitedLiteral();
Token GetVariable();
Token GetFullyQualifiedControl();
Token GetBareword(char c);
Token GetRealLiteral(char c);
Token PeekToken();
Token NextToken();
};
class ControlQualifier
{
public:
bool has_device;
Core::DeviceQualifier device_qualifier;
// Makes no distinction between input and output
std::string control_name;
ControlQualifier() : has_device(false) {}
operator std::string() const
{
if (has_device)
return device_qualifier.ToString() + ":" + control_name;
else
return control_name;
}
void FromString(const std::string& str)
{
const auto col_pos = str.find_last_of(':');
has_device = (str.npos != col_pos);
if (has_device)
{
device_qualifier.FromString(str.substr(0, col_pos));
control_name = str.substr(col_pos + 1);
}
else
{
device_qualifier.FromString("");
control_name = str;
}
}
};
class ControlEnvironment
{
public:
using VariableContainer = std::map<std::string, std::shared_ptr<ControlState>>;
ControlEnvironment(const Core::DeviceContainer& container_, const Core::DeviceQualifier& default_,
VariableContainer& vars)
: m_variables(vars), container(container_), default_device(default_)
{
}
std::shared_ptr<Core::Device> FindDevice(const ControlQualifier& qualifier) const;
Core::Device::Input* FindInput(const ControlQualifier& qualifier) const;
Core::Device::Output* FindOutput(const ControlQualifier& qualifier) const;
// Returns an existing variable by the specified name if already existing. Creates it otherwise.
std::shared_ptr<ControlState> GetVariablePtr(const std::string& name);
void CleanUnusedVariables();
private:
VariableContainer& m_variables;
const Core::DeviceContainer& container;
const Core::DeviceQualifier& default_device;
};
class Expression
{
public:
virtual ~Expression() = default;
virtual ControlState GetValue() const = 0;
virtual void SetValue(ControlState state) = 0;
virtual int CountNumControls() const = 0;
virtual void UpdateReferences(ControlEnvironment& finder) = 0;
};
class ParseResult
{
public:
static ParseResult MakeEmptyResult();
static ParseResult MakeSuccessfulResult(std::unique_ptr<Expression>&& expr);
static ParseResult MakeErrorResult(Token token, std::string description);
ParseStatus status = ParseStatus::EmptyExpression;
std::unique_ptr<Expression> expr;
// Used for parse errors:
// TODO: This should probably be moved elsewhere:
std::optional<Token> token;
std::optional<std::string> description;
private:
ParseResult() = default;
};
ParseResult ParseExpression(const std::string& expr);
ParseResult ParseTokens(const std::vector<Token>& tokens);
void RemoveInertTokens(std::vector<Token>* tokens);
} // namespace ciface::ExpressionParser
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