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ast.h
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ast.h
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#pragma once
#include "formula.h"
#include <cmath>
#include <string>
#include <variant>
#include <memory>
#include <unordered_map>
#include <map>
#include <stack>
#include <set>
namespace Ast {
enum UnaryOperator {
PLUS,
MINUS
};
char ToString(UnaryOperator op);
enum BinaryOperator {
ADD,
SUB,
MUL,
DIV
};
using CellParam = std::optional<Position>;
using CellParamPtr = std::shared_ptr<CellParam>;
char ToString(BinaryOperator op);
struct Literal {
std::string value;
double AsDouble() const {
return std::stod(value);
}
};
class Parentheses;
using ParenthesesPtr = std::unique_ptr<Parentheses>;
class UnaryOp;
using UnaryOpPtr = std::unique_ptr<UnaryOp>;
class BinaryOp;
using BinaryOpPtr = std::unique_ptr<BinaryOp>;
class Node;
class Node : std::variant<Literal, CellParamPtr, ParenthesesPtr, UnaryOpPtr, BinaryOpPtr> {
private:
enum ParenthesesRestrictions {
ALL,
LEFT,
RIGHT,
NONE
};
static constexpr ParenthesesRestrictions UNARY_RESTRICTIONS[4] { ALL, ALL, NONE, NONE };
static Ast::Node SimplifyUnaryParentheses(Ast::Node child);
static constexpr ParenthesesRestrictions BINARY_RESTRICTIONS[4][4] {
{NONE, NONE, NONE, NONE}, // ADD
{RIGHT, RIGHT, NONE, NONE}, // SUB
{ALL, ALL, NONE, NONE}, // MUL
{ALL, ALL, RIGHT, RIGHT} // DIV
};
static Ast::Node SimplifyBinaryParentheses(BinaryOperator parent_op, Ast::Node child, bool left);
public:
using variant::variant;
//region node type checkers
bool IsLiteral() const {
return std::holds_alternative<Ast::Literal>(*this);
}
bool IsCell() const {
return std::holds_alternative<Ast::CellParamPtr>(*this);
}
bool IsParentheses() const {
return std::holds_alternative<ParenthesesPtr>(*this);
}
bool IsUnaryOp() const {
return std::holds_alternative<UnaryOpPtr>(*this);
}
bool IsBinaryOp() const {
return std::holds_alternative<BinaryOpPtr>(*this);
}
//endregion
//region node type converters
const Literal& AsLiteral() const {
return std::get<Ast::Literal>(*this);
}
const CellParam& AsCell() const {
return *std::get<Ast::CellParamPtr>(*this);
}
Parentheses& AsMutableParentheses();
const Parentheses& AsParentheses() const;
UnaryOp& AsMutableUnaryOp();
const UnaryOp& AsUnaryOp() const;
BinaryOp& AsMutableBinaryOp();
const BinaryOp& AsBinaryOp() const;
//endregion
//region static initializers
static Ast::Node OfLiteral(std::string literal);
static Ast::Node OfCellParamPtr(CellParamPtr id);
static Ast::Node OfParentheses(Ast::Node token);
static Ast::Node Unary(Ast::Node token, UnaryOperator op);
static Ast::Node UnaryMinus(Ast::Node token);
static Ast::Node UnaryPlus(Ast::Node token);
static Ast::Node Binary(Ast::Node lhs, Ast::Node rhs, BinaryOperator op);
static Ast::Node BinaryAdd(Ast::Node lhs, Ast::Node rhs);
static Ast::Node BinarySub(Ast::Node lhs, Ast::Node rhs);
static Ast::Node BinaryMul(Ast::Node lhs, Ast::Node rhs);
static Ast::Node BinaryDiv(Ast::Node lhs, Ast::Node rhs);
//endregion
IFormula::Value Evaluate(const ISheet& sheet) const;
std::string BuildExpression() const;
};
class Parentheses {
private:
Ast::Node content_;
public:
explicit Parentheses(Ast::Node&& content): content_(std::move(content)) {}
Ast::Node Extract() {
return std::move(content_);
}
const Ast::Node& GetContent() const {
return content_;
}
};
class UnaryOp {
private:
const Ast::Node token_;
const UnaryOperator op_;
public:
UnaryOp(Ast::Node&& token, UnaryOperator op): token_(std::move(token)), op_(op) {}
const Ast::Node& GetToken() const {
return token_;
}
UnaryOperator GetOp() const {
return op_;
}
};
class BinaryOp {
private:
Ast::Node lhs_;
Ast::Node rhs_;
BinaryOperator op_;
public:
BinaryOp(
Ast::Node&& lhs,
Ast::Node&& rhs,
BinaryOperator op
) : lhs_(std::move(lhs)), rhs_(std::move(rhs)), op_(op) {}
const Ast::Node& GetLhs() const {
return lhs_;
}
const Ast::Node& GetRhs() const {
return rhs_;
}
BinaryOperator GetOp() const {
return op_;
}
};
class CellParamCache {
private:
std::map<int, std::map<int, CellParamPtr>> cell_params_;
public:
const CellParamPtr& GetOrInsert(Position position);
size_t HandleInsertedRows(int before, int count);
size_t HandleInsertedCols(int before, int count);
std::pair<size_t, size_t> HandleDeletedRows(int start, int count);
std::pair<size_t, size_t> HandleDeletedCols(int start, int count);
std::vector<Position> GetReferencedCells() const;
};
class Tree {
private:
Ast::Node root_;
CellParamCache cell_cache_;
public:
Tree(
Ast::Node root,
CellParamCache cell_cache
) : root_(std::move(root)), cell_cache_(std::move(cell_cache)) {}
IFormula::Value Evaluate(const ISheet& sheet) const {
return root_.Evaluate(sheet);
}
std::string BuildExpression() const {
return root_.BuildExpression();
}
std::vector<Position> GetReferencedCells() const {
return cell_cache_.GetReferencedCells();
}
size_t HandleInsertedRows(int before, int count) {
return cell_cache_.HandleInsertedRows(before, count);
}
size_t HandleInsertedCols(int before, int count) {
return cell_cache_.HandleInsertedCols(before, count);
}
std::pair<size_t, size_t> HandleDeletedRows(int first, int count) {
return cell_cache_.HandleDeletedRows(first, count);
}
std::pair<size_t, size_t> HandleDeletedCols(int first, int count) {
return cell_cache_.HandleDeletedCols(first, count);
}
};
class TreeBuilder {
private:
std::stack<Ast::Node> node_stack_;
CellParamCache cell_cache_;
public:
TreeBuilder& AddLiteral(std::string literal);
TreeBuilder& AddCell(const std::string& cell_name);
TreeBuilder& AddParentheses();
TreeBuilder& AddUnaryOp(UnaryOperator op);
TreeBuilder& AddBinaryOp(BinaryOperator op);
Ast::Tree Build();
};
}