89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
/** @file paren_xs.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "exprstate.hpp"
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//#include <cstdint>
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namespace xo {
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namespace scm {
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enum class parenexprstatetype {
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invalid = -1,
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lparen_0,
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lparen_1,
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n_parenexprstatetype,
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};
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/** @class paren_xs
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* @brief state machine for handling parentheses in expressions
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**/
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class paren_xs : public exprstate {
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public:
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paren_xs();
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virtual ~paren_xs() = default;
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static const paren_xs * from(const exprstate * x) { return dynamic_cast<const paren_xs *>(x); }
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static void start(exprstatestack * p_stack);
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bool admits_f64() const;
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bool admits_rightparen() const;
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virtual void on_expr(ref::brw<Expression> expr,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr) override;
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virtual void on_symbol(const std::string & symbol,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr) override;
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virtual void on_typedescr(TypeDescr td,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/) override;
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virtual void on_def_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_symbol_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr) override;
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virtual void on_colon_token(const token_type & tk,
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exprstatestack * p_stack) override;
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virtual void on_semicolon_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * /*p_emit_expr*/) override;
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virtual void on_singleassign_token(const token_type & tk,
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exprstatestack * p_stack) override;
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virtual void on_leftparen_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * /*p_emit_expr*/) override;
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virtual void on_rightparen_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * /*p_emit_expr*/) override;
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virtual void on_f64_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * /*p_emit_expr*/) override;
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virtual void print(std::ostream & os) const override;
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private:
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static std::unique_ptr<paren_xs> make();
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private:
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/**
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* ( foo ... )
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* ^
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* |
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* lparen_0
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**/
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parenexprstatetype parenxs_type_;
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/** populate expression (representing parenthesized value) here **/
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rp<Expression> gen_expr_;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/** end paren_xs.hpp **/
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