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xo-parser: refactor: xtract exprstatestack from parser

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This commit is contained in:
Roland Conybeare 2024-08-01 10:32:23 +10:00
commit a5bd857efd
2 changed files with 76 additions and 28 deletions
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52
src/parser/parser.cpp
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@ -625,10 +625,10 @@ namespace xo {
os << ">";
}
// ----- parser -----
// ----- exprstatestack -----
exprstate &
parser::top_exprstate() {
exprstatestack::top_exprstate() {
std::size_t z = stack_.size();
if (z == 0) {
@ -640,7 +640,7 @@ namespace xo {
}
void
parser::push_exprstate(const exprstate & exs) {
exprstatestack::push_exprstate(const exprstate & exs) {
std::size_t z = stack_.size();
stack_.resize(z+1);
@ -649,16 +649,33 @@ namespace xo {
}
void
parser::pop_exprstate() {
exprstatestack::pop_exprstate() {
std::size_t z = stack_.size();
if (z > 0)
stack_.resize(z-1);
}
void
exprstatestack::print(std::ostream & os) const {
os << "<exprstatestack"
<< xtag("size", stack_.size())
<< std::endl;
for (std::size_t i = 0, z = stack_.size(); i < z; ++i) {
os << " [" << z-i-1 << "] "
<< stack_[i]
<< std::endl;
}
os << ">" << std::endl;
}
// ----- parser -----
void
parser::begin_translation_unit() {
this->push_exprstate
xs_stack_.push_exprstate
(exprstate::expect_toplevel_expression_sequence());
}
@ -668,7 +685,7 @@ namespace xo {
constexpr bool c_debug_flag = true;
scope log(XO_DEBUG(c_debug_flag));
if (stack_.empty()) {
if (xs_stack_.empty()) {
throw std::runtime_error(tostr("parser::include_token",
": parser not expecting input"
"(call parser.begin_translation_unit()..?)",
@ -676,7 +693,7 @@ namespace xo {
}
/* stack_ is non-empty */
expraction action = this->top_exprstate().on_input(tk);
expraction action = xs_stack_.top_exprstate().on_input(tk);
/* loop until reach parsing state that requires more input */
for (;;) {
@ -690,23 +707,25 @@ namespace xo {
return action.expr_ir().expr();
case expractiontype::pop:
this->pop_exprstate();
xs_stack_.pop_exprstate();
if (stack_.empty()) {
if (xs_stack_.empty()) {
throw std::runtime_error(tostr("parser::include_token",
": pop leaves empty stack"));
}
action = this->top_exprstate().on_exprir(action.expr_ir());
action = (xs_stack_
.top_exprstate()
.on_exprir(action.expr_ir()));
break;
case expractiontype::push1:
this->push_exprstate(action.push_exs1());
xs_stack_.push_exprstate(action.push_exs1());
return nullptr;
case expractiontype::push2:
this->push_exprstate(action.push_exs1());
this->push_exprstate(action.push_exs2());
xs_stack_.push_exprstate(action.push_exs1());
xs_stack_.push_exprstate(action.push_exs2());
return nullptr;
case expractiontype::invalid:
@ -721,14 +740,9 @@ namespace xo {
void
parser::print(std::ostream & os) const {
os << "<parser"
<< xtag("stack", stack_.size())
<< std::endl;
for (std::size_t i = 0, z = stack_.size(); i < z; ++i) {
os << " [" << i << "] "
<< stack_[i]
<< std::endl;
}
xs_stack_.print(os);
os << ">" << std::endl;
}