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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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21
include/xo/reader2/DApplySsm.hpp
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@ -30,12 +30,13 @@ namespace xo {
* apply_0 --on_expr()--> apply_1
* apply_1 --on_leftparen()--> apply_2
* apply_2 --on_expr()--> apply_3
* --on_rightparen()--> (done)
* apply_3 --on_comma()--> apply_2
* --on_rightparen()-> (done)
* --on_rightparen()--> (done)
*
* apply_0: start
* apply_1: leftparen following expr allows parser to recognize apply
* apply_2: expect next argument
* apply_2: expect next argument, or rightparent to continue
* apply_3: got argument, expect comma or rightparen to continue
* (done): apply complete, pop exprstate from stack
*
@ -129,6 +130,15 @@ namespace xo {
void on_leftparen_token(const Token & tk,
ParserStateMachine * p_psm);
/** handle rightparen token @p tk for this ssm,
* with overall parser state in @p p_psm.
*
* Rightparen will complete apply-expression,
* terminating this syntax.
**/
void on_rightparen_token(const Token & tk,
ParserStateMachine * p_psm);
///@}
/** @defgroup ssm-applyssm-facet syntaxstatemachine facet methods **/
///@{
@ -177,9 +187,14 @@ namespace xo {
///@}
private:
/** @defgroup ssm-applyssm-mpl-methods **/
/** @defgroup ssm-applyssm-impl-methods **/
///@{
/** create final apply-expression for this syntax,
* using @p mm for memory
**/
obj<AExpression> assemble_expr(obj<AAllocator> mm);
///@}
private: