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xo-XXX -> .xo-XXX (prep subrepo)

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Roland Conybeare 2026-06-06 22:00:54 -04:00
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xo-reader2/include/xo/reader2/ParserStack.hpp
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/** @file ParserStack.hpp
*
* @author Roland Conybeare, Jan 2026
**/
#pragma once
#include "SyntaxStateMachine.hpp"
#include <xo/alloc2/GCObjectVisitor.hpp>
#include <xo/arena/DArena.hpp>
#include <xo/facet/obj.hpp>
#include <xo/indentlog/print/pretty.hpp>
namespace xo {
namespace scm {
/** @brief A stack of expression state machines
*
* Each state machine is dedicated to a particular syntax instance.
* The innermost machine is in xsm; machines for surrounding expressions
* are in progressively removed frames reached via parent links.
**/
class ParserStack {
public:
//using ACollector = xo::mm::ACollector;
using AGCObjectVisitor = xo::mm::AGCObjectVisitor;
using VisitReason = xo::mm::VisitReason;
using DArena = xo::mm::DArena;
using ppindentinfo = xo::print::ppindentinfo;
public:
ParserStack(DArena::Checkpoint ckp,
obj<ASyntaxStateMachine> ssm,
ParserStack * parent);
/** create new top of stack for syntax @p ssm, using memory from @p mm.
* previous stack given by @p parent.
* Checkpoint @p ckp will refer to stack _before_ allocating @p ssm
**/
static ParserStack * push(ParserStack * stack,
DArena::Checkpoint ckp,
DArena & mm,
obj<ASyntaxStateMachine> ssm);
/** unwind effect of last call to @ref push **/
static ParserStack * pop(ParserStack * stack,
DArena & mm);
static constexpr bool is_gc_eligible() { return false; }
DArena::Checkpoint ckp() const noexcept { return ckp_; }
obj<ASyntaxStateMachine> top() const noexcept { return ssm_; }
ParserStack * parent() const noexcept { return parent_; }
/** regular printing **/
void print(std::ostream & os) const;
/** pretty-printer support **/
bool pretty(const ppindentinfo & ppii) const;
void visit_gco_children(VisitReason reason,
obj<AGCObjectVisitor> gc) noexcept;
private:
/** stack pointer: top of stack just before this instance created **/
DArena::Checkpoint ckp_;
/** top of parsing stack: always non-null **/
obj<ASyntaxStateMachine> ssm_;
/** remainder of parsing stack excluding top **/
ParserStack * parent_ = nullptr;
};
inline std::ostream & operator<< (std::ostream & os, const ParserStack * x) {
if (x) {
x->print(os);
} else {
os << "nullptr";
}
return os;
}
} /*namespace scm*/
namespace print {
/** pretty printer in <xo/indentlog/print/pretty.hpp> relies on this specialization
* to handle ParserResult instances
**/
template <>
struct ppdetail<xo::scm::ParserStack*> {
static inline bool print_pretty(const ppindentinfo & ppii, const xo::scm::ParserStack * p) {
if (p)
return p->pretty(ppii);
else
return ppii.pps()->print_upto("nullptr");
}
};
}
} /*namespace xo*/
/* end ParserStack.hpp */