140 lines
5 KiB
C++
140 lines
5 KiB
C++
/** @file DExpectExprSsm.hpp
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*
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* @author Roland Conybeare, Jan 2026
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**/
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#pragma once
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#include "ParserStateMachine.hpp"
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#include "syntaxstatetype.hpp"
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//#include <xo/arena/DArena.hpp>
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#include <xo/facet/obj.hpp>
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#include <xo/indentlog/print/ppindentinfo.hpp>
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namespace xo {
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namespace scm {
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class DExpectExprSsm {
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public:
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using TypeDescr = xo::reflect::TypeDescr;
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using DArena = xo::mm::DArena;
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using ppindentinfo = xo::print::ppindentinfo;
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public:
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explicit DExpectExprSsm(bool allow_defs,
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bool cxl_on_rightparen);
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static DExpectExprSsm * make(DArena & parser_mm,
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bool allow_defs,
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bool cxl_on_rightparen);
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static void start(DArena & parser_mm,
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bool allow_defs,
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bool cxl_on_rightparen,
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ParserStateMachine * p_psm);
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static void start(DArena & parser_mm,
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ParserStateMachine * p_psm);
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/** @defgroup scm-expectexpr-access-methods access methods **/
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///@{
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bool allow_defs() const noexcept { return allow_defs_; }
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bool cxl_on_rightbrace() const noexcept { return cxl_on_rightbrace_; }
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///@}
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/** @defgroup scm-expectexpr-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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/** text describing expected/allowed input to this ssm in current state.
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* Intended to drive error mesages
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**/
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std::string_view get_expect_str() const noexcept;
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/** operate state machine for this syntax on incoming symbol-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_symbol_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_def_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_if_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming colon token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_colon_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming singleassign token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_singleassign_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming f64 token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_f64_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax on incoming semicolon token @p tk,
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* overall parser state in @p p_psm
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**/
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void on_semicolon_token(const Token & tk,
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ParserStateMachine * p_psm);
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/** update state for this syntax after parsing a symbol @p sym;
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* 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 for this syntax after parsing a type-description @p td,
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* 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 for this syntax after parsing an expression @p expr,
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* 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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///@}
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/** @defgroup scm-define-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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/** if true: allow a define-expression here; otherwise reject **/
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bool allow_defs_ = false;
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/** if true: expecting either:
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* 1a. expression
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* 1b. right brace '}', in which case no expression
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* if false: expecting only:
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* 2a. expression
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**/
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bool cxl_on_rightbrace_ = false;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DExpectExprSsm.hpp */
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