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xo-reader2: + ExpectSymbolSsm + SyntaxStateMachine.on_parsed_symbol

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This commit is contained in:
Roland Conybeare 2026-01-19 11:32:39 -05:00
commit 83ef04c250
28 changed files with 537 additions and 52 deletions
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17
xo-reader2/include/xo/reader2/ParserStack.hpp
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@ -6,7 +6,7 @@
#pragma once
#include "SyntaxStateMachine.hpp"
#include <xo/alloc2/Allocator.hpp>
#include <xo/arena/DArena.hpp>
#include <xo/facet/obj.hpp>
namespace xo {
@ -20,22 +20,31 @@ namespace xo {
**/
class ParserStack {
public:
using AAllocator = xo::mm::AAllocator;
using DArena = xo::mm::DArena;
public:
ParserStack(obj<ASyntaxStateMachine> ssm, ParserStack * parent);
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
**/
static ParserStack * push(ParserStack * stack,
obj<AAllocator> mm,
DArena & mm,
obj<ASyntaxStateMachine> ssm);
/** unwind effect of last call to @ref push **/
static ParserStack * pop(ParserStack * stack,
DArena & mm);
DArena::Checkpoint ckp() const noexcept { return ckp_; }
obj<ASyntaxStateMachine> top() const noexcept { return ssm_; }
ParserStack * parent() const noexcept { return parent_; }
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 **/