90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
/** @file paren_xs.hpp
|
|
*
|
|
* Author: Roland Conybeare
|
|
**/
|
|
|
|
#pragma once
|
|
|
|
#include "exprstate.hpp"
|
|
//#include <cstdint>
|
|
|
|
namespace xo {
|
|
namespace scm {
|
|
enum class parenexprstatetype {
|
|
invalid = -1,
|
|
|
|
lparen_0,
|
|
lparen_1,
|
|
|
|
n_parenexprstatetype,
|
|
};
|
|
|
|
/** @class paren_xs
|
|
* @brief state machine for handling parentheses in expressions
|
|
**/
|
|
class paren_xs : public exprstate {
|
|
public:
|
|
paren_xs();
|
|
virtual ~paren_xs() = default;
|
|
|
|
static const paren_xs * from(const exprstate * x) { return dynamic_cast<const paren_xs *>(x); }
|
|
|
|
static std::unique_ptr<paren_xs> lparen_0();
|
|
|
|
virtual bool admits_definition() const override;
|
|
virtual bool admits_symbol() const override;
|
|
virtual bool admits_colon() const override;
|
|
virtual bool admits_semicolon() const override;
|
|
virtual bool admits_singleassign() const override;
|
|
virtual bool admits_leftparen() const override;
|
|
virtual bool admits_rightparen() const override;
|
|
virtual bool admits_f64() const override;
|
|
|
|
// virtual void on_f64(..) override
|
|
virtual void on_def(exprstatestack * p_stack) override;
|
|
|
|
virtual void on_expr(ref::brw<Expression> expr,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_symbol(const std::string & symbol,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_typedescr(TypeDescr td,
|
|
exprstatestack * /*p_stack*/,
|
|
rp<Expression> * /*p_emit_expr*/) override;
|
|
|
|
virtual void on_symbol_token(const token_type & tk,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * p_emit_expr) override;
|
|
virtual void on_colon_token(const token_type & tk,
|
|
exprstatestack * p_stack) override;
|
|
virtual void on_semicolon_token(const token_type & tk,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * /*p_emit_expr*/) override;
|
|
virtual void on_singleassign(exprstatestack * p_stack) override;
|
|
virtual void on_leftparen(exprstatestack * p_stack,
|
|
rp<Expression> * /*p_emit_expr*/) override;
|
|
virtual void on_rightparen(exprstatestack * p_stack,
|
|
rp<Expression> * /*p_emit_expr*/) override;
|
|
virtual void on_f64(const token_type & tk,
|
|
exprstatestack * p_stack,
|
|
rp<Expression> * /*p_emit_expr*/) override;
|
|
|
|
virtual void print(std::ostream & os) const override;
|
|
|
|
private:
|
|
/**
|
|
* ( foo ... )
|
|
* ^
|
|
* |
|
|
* lparen_0
|
|
**/
|
|
parenexprstatetype parenxs_type_;
|
|
/** populate expression (representing parenthesized value) here **/
|
|
rp<Expression> gen_expr_;
|
|
};
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
|
|
/** end paren_xs.hpp **/
|