157 lines
5.5 KiB
C++
157 lines
5.5 KiB
C++
/** @file DExpectFormalArglistSsm.hpp
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*
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* @author Roland Conybeare, Aug 2024
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**/
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#pragma once
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#include "SyntaxStateMachine.hpp"
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#include <xo/object2/DArray.hpp>
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#include <xo/arena/DArena.hpp>
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#ifdef NOT_YET
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#include "exprstate.hpp"
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#include "formal_arg.hpp"
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#include <vector>
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#endif
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namespace xo {
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namespace scm {
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/**
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* ( name(1) : type(1) , ..., )
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* ^ ^ ^ ^ ^
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* | | | | |
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* | | | | argl_1b
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* | argl_1a | argl_1a
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* argl_0 argl_1b
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*
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* argl_0 --on_leftparen_token()--> argl_1a
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* argl_1a --on_formal()--> argl_1b
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* argl_1b -+-on_comma_token()--> argl_1a
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* \-on_rightparen_token()--> (done)
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**/
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enum class formalarglstatetype {
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invalid = -1,
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argl_0,
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argl_1a,
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argl_1b,
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n_formalarglstatetype,
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};
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extern const char *
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formalarglstatetype_descr(formalarglstatetype x);
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inline std::ostream &
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operator<< (std::ostream & os, formalarglstatetype x) {
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os << formalarglstatetype_descr(x);
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return os;
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}
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/** @class expect_formal_arglist
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* @brief parser state-machine for a formal parameter list
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**/
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class DExpectFormalArglistSsm {
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public:
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using DArena = xo::mm::DArena;
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using TypeDescr = xo::reflect::TypeDescr;
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using ppindentinfo = xo::print::ppindentinfo;
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using size_type = std::uint32_t;
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public:
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DExpectFormalArglistSsm(DArray * argl);
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/** create instance, using memory from @parser_mm **/
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static obj<ASyntaxStateMachine,DExpectFormalArglistSsm> make(DArena & parser_mm);
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static DExpectFormalArglistSsm * _make(DArena & parser_mm);
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static void start(ParserStateMachine * p_psm);
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/** @defgroup scm-expectformalarglistssm-methods general methods **/
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///@{
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/** update state on incoming token @p tk, with overall parser state in @p psm **/
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void on_leftparen_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state on incoming token @p tk, with overall parser state in @p psm **/
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void on_comma_token(const Token & tk,
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ParserStateMachine * p_psm);
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///@}
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/** @defgroup scm-expectformalarglistssm-ssm-facet syntaxstatemachine facet methods **/
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///@{
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/** identifies the ssm implemented here **/
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syntaxstatetype ssm_type() const noexcept;
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/** mnemonic for expected input (for this ssm) in current state **/
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std::string_view get_expect_str() const;
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/** update state on incoming token @p tk,
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* with overall parser state in @p p_psm
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**/
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void on_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state on parsed symbol @p sym emitted by nested ssm,
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* with overall parser state in @p p_psm
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**/
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void on_parsed_symbol(std::string_view sym,
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ParserStateMachine * p_psm);
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/** update state on parsed typedescr @p td emitted by nested ssm,
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* with overall parser state in @p p_psm
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**/
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void on_parsed_typedescr(TypeDescr td,
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ParserStateMachine * p_psm);
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/** update state to consume parsed param (name,type) emitted by
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* nested ssm, with overall parser state in @p p_psm
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**/
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void on_parsed_formal(const DUniqueString * param_name,
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TypeDescr param_type,
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ParserStateMachine * p_psm);
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/** update state on parsed expression emitted by nested ssm
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* with overall parser state in @p p_psm
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**/
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void on_parsed_expression(obj<AExpression> expr,
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ParserStateMachine * p_psm);
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/** update state on parsed expression, along with following semicolon,
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* emitted by nested ssm with overall parser state in @p p_psm
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**/
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void on_parsed_expression_with_semicolon(obj<AExpression> expr,
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ParserStateMachine * p_psm);
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#ifdef NOT_YET
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virtual void on_comma_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_rightparen_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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#endif
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///@}
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/** @defgroup scm-expectformalarglistssm-printable-facet printable facet methods **/
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///@{
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bool pretty(const ppindentinfo & ppii) const;
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///@}
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private:
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/** parsing state-machine state **/
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formalarglstatetype fastate_ = formalarglstatetype::argl_0;
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/** populate with (parmaeter-name, parameter-type) list
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* as they're encountered.
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*
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* Not using flexible array here since we don't know size at construction time
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**/
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DArray * argl_ = nullptr;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DExpectFormalArglistSsm.hpp */
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