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xo-reader2: corrections to toplevel SchematikaParser setup

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This commit is contained in:
Roland Conybeare 2026-01-18 20:23:00 -05:00
commit a8eb35bd1a
7 changed files with 93 additions and 34 deletions
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21
include/xo/reader2/ParserStateMachine.hpp
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@ -41,16 +41,28 @@ namespace xo {
const ParserResult & result() const noexcept { return result_; }
obj<AAllocator> expr_alloc() const noexcept { return expr_alloc_; }
/** true iff state machine is currently idle (at top-level) **/
bool is_at_toplevel() const noexcept;
/** true iff state machine currently has incomplete expression **/
bool has_incomplete_expr() const noexcept;
///@}
/** @defgroup scm-parserstatemachine-bookkeeping bookkeeping methods **/
///@{
/** establish toplevel @p ssm. Must have empty stack **/
void establish_toplevel_ssm(obj<ASyntaxStateMachine> ssm);
/** push syntax @p ssm onto @ref stack_ **/
void push_ssm(obj<ASyntaxStateMachine> ssm);
/** reset result to none **/
void reset_result() { result_ = ParserResult(); }
void reset_result();
/** reset after reporting error **/
void clear_error_reset();
///@}
@ -89,6 +101,7 @@ namespace xo {
///@}
private:
/** Arena for internal parsing stack.
* Must be owned exclusively because destructively
* modified as parser completes parsing of each sub-expression
@ -97,6 +110,12 @@ namespace xo {
**/
DArena parser_alloc_;
/** Checkpoint of toplevel parser allocator.
* Retore parser_alloc to this checkpoint to proceed
* after encountering a parsing error.
**/
DArena::Checkpoint parser_alloc_ckp_;
/** parser stack. Memory from @ref parser_alloc_ **/
ParserStack * stack_ = nullptr;