155 lines
5.7 KiB
C++
155 lines
5.7 KiB
C++
/** @file DToplevelSeqSsm.hpp
|
|
*
|
|
* @author Roland Conybeare, Jan 2026
|
|
**/
|
|
|
|
#pragma once
|
|
|
|
#include "DSyntaxStateMachine.hpp"
|
|
#include "syntaxstatetype.hpp"
|
|
#include <xo/facet/obj.hpp>
|
|
|
|
namespace xo {
|
|
namespace scm {
|
|
enum class exprseqtype {
|
|
/** toplevel interactive sequence.
|
|
* allows: rvalue expressions
|
|
**/
|
|
toplevel_interactive,
|
|
/** toplevel non-interactive sequence.
|
|
* allows:
|
|
**/
|
|
toplevel_batch,
|
|
/** counts number of valid enums **/
|
|
N
|
|
};
|
|
|
|
const char * exprseqtype_descr(exprseqtype x);
|
|
|
|
inline std::ostream & operator<<(std::ostream & os, exprseqtype x) {
|
|
os << exprseqtype_descr(x);
|
|
return os;
|
|
}
|
|
|
|
/** @class DToplevelSeqSsm
|
|
* @brief state machine for parsing a sequence of expression
|
|
*
|
|
* Similar to exprseq_xs in xo-expresion
|
|
**/
|
|
class DToplevelSeqSsm : public DSyntaxStateMachine<DToplevelSeqSsm> {
|
|
public:
|
|
using Super = DSyntaxStateMachine<DToplevelSeqSsm>;
|
|
using TypeDescr = xo::reflect::TypeDescr;
|
|
using AAllocator = xo::mm::AAllocator;
|
|
using DArena = xo::mm::DArena;
|
|
using ppindentinfo = xo::print::ppindentinfo;
|
|
|
|
public:
|
|
explicit DToplevelSeqSsm(exprseqtype ty);
|
|
|
|
/** start interactive top-level session **/
|
|
static void establish_interactive(DArena & mm,
|
|
ParserStateMachine * p_psm);
|
|
/** start non-interactive top-level session **/
|
|
static void establish_batch(DArena & mm,
|
|
ParserStateMachine * p_psm);
|
|
|
|
public:
|
|
static const char * ssm_classname() { return "DToplevelSeqSsm"; }
|
|
|
|
/** @defgroup scm-exprseq-ssm-facet syntaxstatemachine facet methods **/
|
|
///@{
|
|
|
|
/** identifies the ssm implemented here **/
|
|
syntaxstatetype ssm_type() const noexcept;
|
|
|
|
/** text describing expected/allowed input to this ssm in current state.
|
|
* Intended to drive error mesages
|
|
**/
|
|
std::string_view get_expect_str() const noexcept;
|
|
|
|
/** operate state machine for this syntax on incoming token @p tk
|
|
* with overall parser state in @p p_psm
|
|
**/
|
|
void on_token(const Token & tk,
|
|
ParserStateMachine * p_psm);
|
|
|
|
/** operate state machine for this syntax on incoming symbol token @p tk
|
|
* with overall parser state in @p p_psm
|
|
**/
|
|
void on_symbol_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_def_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming lamdba token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_lambda_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_if_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming string token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_string_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming f64 token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_f64_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming i64 token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_i64_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming bool token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_bool_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on incoming leftparen token @p tk,
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_leftparen_token(const Token & tk, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on parsed expression @p expr
|
|
* from nested ssm.
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_parsed_expression(obj<AExpression> expr, ParserStateMachine * p_psm);
|
|
|
|
/** update state for this syntax on parsed expression @p expr
|
|
* followed by token @p tk from nested ssm.
|
|
* overall parser state in @p p_psm
|
|
**/
|
|
void on_parsed_expression_with_token(obj<AExpression> expr,
|
|
const Token & tk,
|
|
ParserStateMachine * p_psm);
|
|
|
|
///@}
|
|
/** @defgroup scm-exprseq-printable-facet printable facet methods **/
|
|
///@{
|
|
|
|
/** pretty-printing driver; combine layout+printing **/
|
|
bool pretty(const ppindentinfo & ppii) const;
|
|
|
|
///@}
|
|
|
|
private:
|
|
/** sequence type. accept rvalue expressions when
|
|
* this is toplevel_interactive.
|
|
* Always accept definitions and declarations.
|
|
**/
|
|
exprseqtype seqtype_;
|
|
};
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
/* end DToplevelSeqSsm.hpp */
|