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detailed parser error reporting [wip - 1 example]

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This commit is contained in:
Roland Conybeare 2025-07-19 21:09:57 -05:00
commit 65a83cd77c
19 changed files with 256 additions and 84 deletions
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19
xo-reader/src/reader/parser.cpp
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@ -30,7 +30,7 @@ namespace xo {
// ----- parser -----
parser::parser()
: xs_stack_{}, env_stack_{}
: xs_stack_{}, env_stack_{}, result_{}
{
/* top-level environment. initially empty */
rp<LocalEnv> toplevel_env = LocalEnv::make_empty();
@ -46,25 +46,23 @@ namespace xo {
void
parser::begin_interactive_session() {
/* note: not using emit expr here */
parserstatemachine psm(&xs_stack_,
&env_stack_,
nullptr /*p_emit_expr*/);
&result_);
exprseq_xs::start(exprseqtype::toplevel_interactive, &psm);
}
void
parser::begin_translation_unit() {
/* note: not using emit expr here */
parserstatemachine psm(&xs_stack_,
&env_stack_,
nullptr /*p_emit_expr*/);
&result_);
exprseq_xs::start(exprseqtype::toplevel_batch, &psm);
}
rp<Expression>
const parser_result &
parser::include_token(const token_type & tk)
{
constexpr bool c_debug_flag = true;
@ -81,15 +79,11 @@ namespace xo {
log && log(xtag("top", xs_stack_.top_exprstate()));
rp<Expression> retval;
parserstatemachine psm(&xs_stack_, &env_stack_, &retval);
parserstatemachine psm(&xs_stack_, &env_stack_, &result_);
xs_stack_.top_exprstate().on_input(tk, &psm);
log && log(xtag("retval", retval));
return retval;
return result_;
} /*include_token*/
void
@ -97,6 +91,7 @@ namespace xo {
{
xs_stack_.reset_to_toplevel();
env_stack_.reset_to_toplevel();
result_ = parser_result::none();
} /*discard_current_state*/
void