66 lines
1.1 KiB
C++
66 lines
1.1 KiB
C++
#ifndef EXPR_HH
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#define EXPR_HH
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#include "../tokenizer.hh"
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#include <memory>
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#include <string>
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#include <variant>
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struct Expr;
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using ExprPtr = std::shared_ptr<Expr>;
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struct Binary {
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Binary(ExprPtr left, Token op, ExprPtr right) : left{left}, op{op}, right{right} {};
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ExprPtr left;
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Token op;
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ExprPtr right;
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};
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struct Grouping {
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Grouping(ExprPtr expr) : expression{expr} {};
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ExprPtr expression;
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};
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struct Literal {
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Literal(Object value) : value{value} {};
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Object value;
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};
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struct Unary {
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Unary(Token op, ExprPtr right) : op{op}, right{right} {};
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Token op;
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ExprPtr right;
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};
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enum class ExprType {
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BINARY,
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GROUPING,
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LITERAL,
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UNARY,
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};
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using Expression = std::variant<Binary, Grouping, Literal, Unary>;
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struct Expr {
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Expr(ExprType type, Expression value) : type{type}, value{value} {}
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ExprType type;
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Expression value;
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};
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template <typename T>
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Expr make_expr(T value);
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class AstPrinter {
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public:
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std::string print(const Expr &expr);
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private:
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std::string parenthesize(const std::string &name, std::vector<Expr> exprs);
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};
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#endif
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