72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/** @file lambda_xs.hpp
|
|
*
|
|
* Author: Roland Conybeare
|
|
**/
|
|
|
|
#pragma once
|
|
|
|
#include "exprstate.hpp"
|
|
//#include <cstdint>
|
|
|
|
namespace xo {
|
|
namespace scm {
|
|
/**
|
|
* lambda ( name(1) : type(1), ..., ) body-expr ;
|
|
* ^ ^ ^ ^
|
|
* | | | |
|
|
* lm_0 lm_1 lm_2 lm_3
|
|
*
|
|
* lm_0 --on_lambda_token()--> lm_1
|
|
* lm_1 --on_formal_arglist()--> lm_2
|
|
* lm_2 --on_expr()--> lm_3
|
|
* lm_3 --on_semicolon_token()--> (done)
|
|
**/
|
|
enum class lambdastatetype {
|
|
invalid = -1,
|
|
|
|
lm_0,
|
|
lm_1,
|
|
lm_2,
|
|
lm_3,
|
|
|
|
n_lambdastatetype
|
|
};
|
|
|
|
/** @class lambda_xs
|
|
* @brief parsing state-machine for a lambda-expression
|
|
*
|
|
**/
|
|
class lambda_xs : public exprstate {
|
|
public:
|
|
lambda_xs();
|
|
|
|
static std::unique_ptr<lambda_xs> make();
|
|
|
|
virtual void on_lambda_token(const token_type & tk,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_formal_arglist(const std::vector<rp<Variable>> & argl,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_expr(ref::brw<Expression> expr,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_semicolon_token(const token_type & tk,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
|
|
private:
|
|
/** parsing state-machine state **/
|
|
lambdastatetype lmxs_type_;
|
|
|
|
/** formal parameter list **/
|
|
std::vector<rp<Variable>> argl_;
|
|
|
|
/** body expression **/
|
|
rp<Expression> body_;
|
|
};
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
|
|
/** end lambda_xs.hpp **/
|