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xo-reader2: support 0-argument apply-expressions

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This commit is contained in:
Roland Conybeare 2026-02-28 13:21:54 +11:00
commit 6795c1bc15
7 changed files with 138 additions and 77 deletions
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32
include/xo/reader2/DExpectExprSsm.hpp
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@ -22,21 +22,24 @@ namespace xo {
using ppindentinfo = xo::print::ppindentinfo;
public:
explicit DExpectExprSsm(bool allow_defs,
bool cxl_on_rightparen);
DExpectExprSsm(bool allow_defs,
bool cxl_on_rightbrace,
bool cxl_on_rightparen);
static DExpectExprSsm * _make(DArena & parser_mm,
bool allow_defs,
bool cxl_on_rightbrace);
bool cxl_on_rightbrace,
bool cxl_on_rightparen);
/** create fop referring to new DExpectExprSsm **/
static obj<ASyntaxStateMachine,DExpectExprSsm> make(DArena & parser_mm,
bool allow_defs,
bool cxl_on_rightbrace);
bool cxl_on_rightbrace,
bool cxl_on_rightparen);
static void start(DArena & parser_mm,
bool allow_defs,
static void start(bool allow_defs,
bool cxl_on_rightbrace,
bool cxl_on_rightparen,
ParserStateMachine * p_psm);
static void start(ParserStateMachine * p_psm);
@ -46,6 +49,7 @@ namespace xo {
static const char * ssm_classname() { return "DExpectExprSsm"; }
bool allow_defs() const noexcept { return allow_defs_; }
bool cxl_on_rightbrace() const noexcept { return cxl_on_rightbrace_; }
bool cxl_on_rightparen() const noexcept { return cxl_on_rightparen_; }
///@}
/** @defgroup scm-expectexpr-methods general methods **/
@ -57,6 +61,15 @@ namespace xo {
void on_leftparen_token(const Token & tk,
ParserStateMachine * p_psm);
/** update state for this syntax on incoming rightparen token @p tk,
* with overall parser state in @p p_psm.
*
* Generally treats as illegal, but cancels gracefully when
* @ref cxl_on_rightparen_ set.
**/
void on_rightparen_token(const Token & tk,
ParserStateMachine * p_psm);
/** update state for this syntax on incoming leftbrace token @p tk,
* with overall parser state in @p p_psm
**/
@ -165,8 +178,11 @@ namespace xo {
* 2a. expression
**/
bool cxl_on_rightbrace_ = false;
/** if true: expecting either:
* 1a. expression
* 1b. right paren ')', in which case no expression
**/
bool cxl_on_rightparen_ = false;
};
} /*namespace scm*/
} /*namespace xo*/