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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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78
src/reader2/DApplySsm.cpp
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@ -116,7 +116,7 @@ namespace xo {
case applyexprstatetype::invalid: return "invalid";
case applyexprstatetype::apply_0: return "expr";
case applyexprstatetype::apply_1: return "lparen";
case applyexprstatetype::apply_2: return "expr";
case applyexprstatetype::apply_2: return "expr|rparen";
case applyexprstatetype::apply_3: return "comma|rparen";
case applyexprstatetype::N: break;
}
@ -134,6 +134,9 @@ namespace xo {
case tokentype::tk_leftparen:
this->on_leftparen_token(tk, p_psm);
return;
case tokentype::tk_rightparen:
this->on_rightparen_token(tk, p_psm);
return;
case tokentype::tk_symbol:
case tokentype::tk_def:
case tokentype::tk_if:
@ -147,7 +150,6 @@ namespace xo {
case tokentype::tk_i64:
case tokentype::tk_bool:
case tokentype::tk_invalid:
case tokentype::tk_rightparen:
case tokentype::tk_leftbracket:
case tokentype::tk_rightbracket:
case tokentype::tk_leftbrace:
@ -186,7 +188,25 @@ namespace xo {
if (applystate_ == applyexprstatetype::apply_1) {
this->applystate_ = applyexprstatetype::apply_2;
DExpectExprSsm::start(p_psm);
DExpectExprSsm::start(false /*!allow_defs*/,
false /*!cxl_on_rightbrace*/,
true /*cxl_on_rightparen*/,
p_psm);
return;
}
Super::on_token(tk, p_psm);
}
void
DApplySsm::on_rightparen_token(const Token & tk,
ParserStateMachine * p_psm)
{
if (applystate_ == applyexprstatetype::apply_2) {
obj<AExpression> apply = this->assemble_expr(p_psm->expr_alloc());
p_psm->pop_ssm();
p_psm->on_parsed_expression(apply);
return;
}
@ -226,28 +246,7 @@ namespace xo {
args_expr_v_->push_back(expr_gco);
if (tk.tk_type() == tokentype::tk_rightparen) {
// begin assemble_expr()..
std::uint32_t n_args = args_expr_v_->size();
DApplyExpr * apply
= (DApplyExpr::scaffold
(mm,
TypeRef::dwim(TypeRef::prefix_type::from_chars("apply"),
nullptr),
fn_expr_,
n_args));
for (std::uint32_t i_arg = 0; i_arg < n_args; ++i_arg) {
auto arg_expr
= args_expr_v_->at(i_arg).to_facet<AExpression>();
apply->assign_arg(i_arg, arg_expr);
}
// ..end assemble_expr()
obj<AExpression,DApplyExpr> apply_ex(apply);
obj<AExpression> apply_ex = this->assemble_expr(p_psm->expr_alloc());
p_psm->pop_ssm();
p_psm->on_parsed_expression(apply_ex);
@ -266,6 +265,35 @@ namespace xo {
Super::on_parsed_expression_with_token(expr, tk, p_psm);
}
obj<AExpression>
DApplySsm::assemble_expr(obj<AAllocator> mm)
{
// begin assemble_expr()..
std::uint32_t n_args = args_expr_v_->size();
DApplyExpr * apply
= (DApplyExpr::scaffold
(mm,
TypeRef::dwim(TypeRef::prefix_type::from_chars("apply"),
nullptr),
fn_expr_,
n_args));
for (std::uint32_t i_arg = 0; i_arg < n_args; ++i_arg) {
auto arg_expr
= args_expr_v_->at(i_arg).to_facet<AExpression>();
apply->assign_arg(i_arg, arg_expr);
}
// ..end assemble_expr()
obj<AExpression,DApplyExpr> apply_ex(apply);
return apply_ex;
}
#ifdef NOT_YET
void
apply_xs::on_expr(bp<Expression> expr,