124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
/** @file progress_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 <iostream>
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//#include <cstdint>
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namespace xo {
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namespace scm {
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/* represent an infix operator */
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enum class optype {
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invalid = -1,
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op_add,
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op_subtract,
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op_multiply,
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op_divide,
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n_optype
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};
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extern const char *
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optype_descr(optype x);
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extern int
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precedence(optype x);
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inline std::ostream &
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operator<< (std::ostream & os, optype x) {
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os << optype_descr(x);
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return os;
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}
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/** @class progress_xs
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* @brief state machine for parsing a schematica runtime-value-expression
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**/
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class progress_xs : public exprstate {
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public:
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progress_xs(rp<Expression> valex, optype op);
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virtual ~progress_xs() = default;
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static const progress_xs * from(const exprstate * x) {
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return dynamic_cast<const progress_xs *>(x);
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}
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static void start(rp<Expression> valex,
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optype optype,
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exprstatestack * p_stack);
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static void start(rp<Expression> valex,
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exprstatestack * p_stack);
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bool admits_f64() 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_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_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_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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/* entry point for an infix operator token */
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virtual void on_operator_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<progress_xs> make(rp<Expression> valex,
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optype optype = optype::invalid);
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private:
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/** assemble expression representing
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* value of
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* @code
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* f(lhs_, rhs_)
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* @endcode
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*
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* where f determined by @ref op_type_
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**/
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rp<Expression> assemble_expr();
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private:
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/** populate an expression here, may be followed by an operator **/
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rp<Expression> lhs_;
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/** infix operator, if supplied **/
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optype op_type_ = optype::invalid;
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/** populate an expression here, following infix operator */
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rp<Expression> rhs_;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/** end progress_xs.hpp **/
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