455 lines
15 KiB
C++
455 lines
15 KiB
C++
/** @file DIfElseSsm.cpp
|
|
*
|
|
* @author Roland Conybeare, Jul 2025
|
|
**/
|
|
|
|
#include "DIfElseSsm.hpp"
|
|
#include "ssm/ISyntaxStateMachine_DIfElseSsm.hpp"
|
|
#include "ssm/IPrintable_DDefineSsm.hpp"
|
|
#include "DExpectExprSsm.hpp"
|
|
#include <xo/expression2/detail/IPrintable_DIfElseExpr.hpp>
|
|
#include <xo/printable2/Printable.hpp>
|
|
#include <xo/facet/FacetRegistry.hpp>
|
|
//#include "exprstatestack.hpp"
|
|
//#include "parserstatemachine.hpp"
|
|
//#include "expect_expr_xs.hpp"
|
|
//#include "xo/indentlog/print/ppdetail_atomic.hpp"
|
|
|
|
namespace xo {
|
|
using xo::print::APrintable;
|
|
using xo::facet::FacetRegistry;
|
|
using xo::facet::with_facet;
|
|
using xo::reflect::typeseq;
|
|
|
|
namespace scm {
|
|
// ----- ifexprstatetype -----
|
|
|
|
const char *
|
|
ifexprstatetype_descr(ifexprstatetype x) {
|
|
switch (x) {
|
|
case ifexprstatetype::invalid: return "invalid";
|
|
case ifexprstatetype::if_0: return "if_0";
|
|
case ifexprstatetype::if_1: return "if_1";
|
|
case ifexprstatetype::if_2: return "if_2";
|
|
case ifexprstatetype::if_3: return "if_3";
|
|
case ifexprstatetype::if_4: return "if_4";
|
|
case ifexprstatetype::if_5: return "if_5";
|
|
case ifexprstatetype::if_6: return "if_6";
|
|
case ifexprstatetype::N: break;
|
|
}
|
|
|
|
return "ifexprstatetype?";
|
|
}
|
|
|
|
std::ostream &
|
|
operator<<(std::ostream & os, ifexprstatetype x) {
|
|
os << ifexprstatetype_descr(x);
|
|
return os;
|
|
}
|
|
|
|
// ----- DIfElseSsm -----
|
|
|
|
DIfElseSsm::DIfElseSsm(DIfElseExpr * ifelse_expr) : ifstate_{ifexprstatetype::if_0},
|
|
if_expr_{ifelse_expr}
|
|
{}
|
|
|
|
DIfElseSsm *
|
|
DIfElseSsm::_make(DArena & mm,
|
|
DIfElseExpr * ifelse_expr)
|
|
{
|
|
void * mem = mm.alloc(typeseq::id<DIfElseSsm>(),
|
|
sizeof(DIfElseSsm));
|
|
|
|
return new (mem) DIfElseSsm(ifelse_expr);
|
|
}
|
|
|
|
obj<ASyntaxStateMachine,DIfElseSsm>
|
|
DIfElseSsm::make(DArena & mm,
|
|
DIfElseExpr * ifelse_expr)
|
|
{
|
|
return obj<ASyntaxStateMachine,DIfElseSsm>(_make(mm, ifelse_expr));
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::start(DArena & parser_mm,
|
|
obj<AAllocator> expr_mm,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
DArena::Checkpoint ckp = parser_mm.checkpoint();
|
|
|
|
DIfElseExpr * if_expr = DIfElseExpr::_make_empty(expr_mm);
|
|
|
|
auto ssm = DIfElseSsm::make(parser_mm, if_expr);
|
|
|
|
p_psm->push_ssm(ckp, ssm);
|
|
|
|
// note: triggers poly dispatch
|
|
p_psm->on_token(Token::if_token());
|
|
}
|
|
|
|
syntaxstatetype
|
|
DIfElseSsm::ssm_type() const noexcept
|
|
{
|
|
return syntaxstatetype::ifelseexpr;
|
|
}
|
|
|
|
std::string_view
|
|
DIfElseSsm::get_expect_str() const noexcept
|
|
{
|
|
/**
|
|
* if test-expr then then-expr else else-expr ;
|
|
* ^ ^ ^ ^ ^ ^ ^
|
|
* | | | | | | |
|
|
* | if_1 if_2 if_3 if_4 if_5 if_6
|
|
* if_0
|
|
*
|
|
* if_0 --on_if_token()--> if_1
|
|
* if_1 --on_expr()--> if_2
|
|
* if_2 --on_then_token()--> if_3
|
|
* if_3 --on_expr()--> if_4
|
|
* if_4 --on_else_token()--> if_5
|
|
* --on_semicolon_token()--> (done)
|
|
* if_5 --on_expr()-->if_6
|
|
* if_6 --on_semicolon_token()--> (done)
|
|
**/
|
|
switch (this->ifstate_) {
|
|
case ifexprstatetype::invalid:
|
|
case ifexprstatetype::N:
|
|
assert(false); // unreachable
|
|
break;
|
|
case ifexprstatetype::if_0:
|
|
return "if";
|
|
case ifexprstatetype::if_1:
|
|
return "expression";
|
|
case ifexprstatetype::if_2:
|
|
return "then";
|
|
case ifexprstatetype::if_3:
|
|
return "expression";
|
|
case ifexprstatetype::if_4:
|
|
return "else|semicolon";
|
|
case ifexprstatetype::if_5:
|
|
return "expression";
|
|
case ifexprstatetype::if_6:
|
|
return "semicolon";
|
|
}
|
|
|
|
return "?expect";
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::on_token(const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()), xtag("tk", tk));
|
|
|
|
switch (tk.tk_type()) {
|
|
case tokentype::tk_symbol:
|
|
case tokentype::tk_def:
|
|
break;
|
|
case tokentype::tk_if:
|
|
this->on_if_token(tk, p_psm);
|
|
return;
|
|
case tokentype::tk_then:
|
|
this->on_then_token(tk, p_psm);
|
|
return;
|
|
case tokentype::tk_else:
|
|
this->on_else_token(tk, p_psm);
|
|
return;
|
|
case tokentype::tk_semicolon:
|
|
this->on_semicolon_token(tk, p_psm);
|
|
return;
|
|
case tokentype::tk_colon:
|
|
case tokentype::tk_singleassign:
|
|
case tokentype::tk_string:
|
|
case tokentype::tk_f64:
|
|
case tokentype::tk_i64:
|
|
case tokentype::tk_bool:
|
|
case tokentype::tk_invalid:
|
|
case tokentype::tk_leftparen:
|
|
case tokentype::tk_rightparen:
|
|
case tokentype::tk_leftbracket:
|
|
case tokentype::tk_rightbracket:
|
|
case tokentype::tk_leftbrace:
|
|
case tokentype::tk_rightbrace:
|
|
case tokentype::tk_leftangle:
|
|
case tokentype::tk_rightangle:
|
|
case tokentype::tk_lessequal:
|
|
case tokentype::tk_greatequal:
|
|
case tokentype::tk_dot:
|
|
case tokentype::tk_comma:
|
|
case tokentype::tk_doublecolon:
|
|
case tokentype::tk_assign:
|
|
case tokentype::tk_yields:
|
|
case tokentype::tk_plus:
|
|
case tokentype::tk_minus:
|
|
case tokentype::tk_star:
|
|
case tokentype::tk_slash:
|
|
case tokentype::tk_cmpeq:
|
|
case tokentype::tk_cmpne:
|
|
case tokentype::tk_type:
|
|
case tokentype::tk_lambda:
|
|
case tokentype::tk_let:
|
|
case tokentype::tk_in:
|
|
case tokentype::tk_end:
|
|
case tokentype::N:
|
|
break;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_token(tk, p_psm);
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::on_if_token(const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
log && log("ifstate", ifstate_);
|
|
|
|
if (ifstate_ == ifexprstatetype::if_0) {
|
|
this->ifstate_ = ifexprstatetype::if_1;
|
|
|
|
DExpectExprSsm::start(p_psm);
|
|
return;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_token(tk, p_psm);
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::on_then_token(const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
log && log("ifstate", ifstate_);
|
|
|
|
if (ifstate_ == ifexprstatetype::if_2) {
|
|
this->ifstate_ = ifexprstatetype::if_3;
|
|
|
|
DExpectExprSsm::start(p_psm);
|
|
return;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_token(tk, p_psm);
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::on_else_token(const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
log && log("ifstate", ifstate_);
|
|
|
|
if (ifstate_ == ifexprstatetype::if_4) {
|
|
this->ifstate_ = ifexprstatetype::if_5;
|
|
|
|
DExpectExprSsm::start(p_psm);
|
|
return;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_token(tk, p_psm);
|
|
}
|
|
|
|
#ifdef NOT_YET
|
|
void
|
|
if_else_xs::finish_and_continue(parserstatemachine * p_psm)
|
|
{
|
|
rp<IfExprAccess> if_expr = this->if_expr_;
|
|
std::unique_ptr<exprstate> self = p_psm->pop_exprstate();
|
|
|
|
if (this->ifxs_type_ == ifexprstatetype::if_4) {
|
|
/* if no else-branch, then if-expr can't have valuetype */
|
|
if_expr->assign_valuetype(nullptr);
|
|
}
|
|
|
|
p_psm->top_exprstate().on_expr(if_expr, p_psm);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
DIfElseSsm::finish_and_continue(ParserStateMachine * p_psm)
|
|
{
|
|
p_psm->pop_ssm();
|
|
|
|
// rp<IfExprAccess> if_expr = this->if_expr_;
|
|
// std::unique_ptr<exprstate> self = p_psm->pop_exprstate();
|
|
|
|
p_psm->on_parsed_expression(if_expr_);
|
|
}
|
|
|
|
#ifdef NOT_YET
|
|
void
|
|
if_else_xs::on_rightbrace_token(const token_type & tk,
|
|
parserstatemachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
this->finish_and_continue(p_psm);
|
|
p_psm->on_rightbrace_token(tk);
|
|
}
|
|
|
|
#endif
|
|
|
|
void
|
|
DIfElseSsm::on_semicolon_token(const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
log && log("ifstate", ifstate_);
|
|
|
|
switch (ifstate_) {
|
|
case ifexprstatetype::invalid:
|
|
case ifexprstatetype::N:
|
|
// unreachable
|
|
assert(false);
|
|
break;
|
|
|
|
case ifexprstatetype::if_0:
|
|
case ifexprstatetype::if_1:
|
|
case ifexprstatetype::if_2:
|
|
case ifexprstatetype::if_3:
|
|
case ifexprstatetype::if_5:
|
|
break;
|
|
case ifexprstatetype::if_4:
|
|
case ifexprstatetype::if_6:
|
|
this->finish_and_continue(p_psm);
|
|
return;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_token(tk, p_psm);
|
|
}
|
|
|
|
#ifdef NOT_YET
|
|
void
|
|
if_else_xs::on_expr(bp<Expression> expr,
|
|
parserstatemachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
log && log(xtag("ifxs_type", ifxs_type_));
|
|
|
|
switch (this->ifxs_type_) {
|
|
case ifexprstatetype::invalid:
|
|
case ifexprstatetype::if_0:
|
|
case ifexprstatetype::n_ifexprstatetype:
|
|
assert(false); // unreachable
|
|
return;
|
|
case ifexprstatetype::if_1:
|
|
if_expr_->assign_test(expr.promote());
|
|
ifxs_type_ = ifexprstatetype::if_2;
|
|
return;
|
|
case ifexprstatetype::if_2:
|
|
/** error: expecting 'then' **/
|
|
break;
|
|
case ifexprstatetype::if_3:
|
|
if_expr_->assign_when_true(expr.promote());
|
|
ifxs_type_ = ifexprstatetype::if_4;
|
|
return;
|
|
case ifexprstatetype::if_4:
|
|
/** error: expecting 'else' or ';' **/
|
|
break;
|
|
case ifexprstatetype::if_5:
|
|
if_expr_->assign_when_false(expr.promote());
|
|
ifxs_type_ = ifexprstatetype::if_6;
|
|
return;
|
|
case ifexprstatetype::if_6:
|
|
/** error: expecting ';' **/
|
|
break;
|
|
}
|
|
|
|
constexpr const char* c_self_name = "if_else_xs::on_expr";
|
|
const char * exp = get_expect_str();
|
|
|
|
this->illegal_input_on_expr(c_self_name, expr, exp, p_psm);
|
|
}
|
|
|
|
#endif
|
|
|
|
void
|
|
DIfElseSsm::on_parsed_expression(obj<AExpression> expr,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
log && log(xtag("ifstate", ifstate_));
|
|
|
|
// if (ifstate_ == ...) { .... return; }
|
|
|
|
switch (ifstate_) {
|
|
case ifexprstatetype::invalid:
|
|
case ifexprstatetype::N:
|
|
assert(false);
|
|
break;
|
|
case ifexprstatetype::if_0:
|
|
// should be unreachable
|
|
break;
|
|
case ifexprstatetype::if_1:
|
|
if_expr_.data()->assign_test(expr);
|
|
this->ifstate_ = ifexprstatetype::if_2;
|
|
return;
|
|
case ifexprstatetype::if_2:
|
|
// error: expecting "then" token here
|
|
break;
|
|
case ifexprstatetype::if_3:
|
|
if_expr_.data()->assign_when_true(expr);
|
|
this->ifstate_ = ifexprstatetype::if_4;
|
|
return;
|
|
case ifexprstatetype::if_4:
|
|
// error: expecting "else" or ";"
|
|
break;
|
|
case ifexprstatetype::if_5:
|
|
if_expr_.data()->assign_when_false(expr);
|
|
this->ifstate_ = ifexprstatetype::if_6;
|
|
return;
|
|
case ifexprstatetype::if_6:
|
|
// error: expecting ";"
|
|
break;
|
|
}
|
|
|
|
DSyntaxStateMachine<DIfElseSsm>::on_parsed_expression(expr, p_psm);
|
|
}
|
|
|
|
void
|
|
DIfElseSsm::on_parsed_expression_with_token(obj<AExpression> expr,
|
|
const Token & tk,
|
|
ParserStateMachine * p_psm)
|
|
{
|
|
scope log(XO_DEBUG(p_psm->debug_flag()));
|
|
|
|
// TODO: may consider allowing if-else to terminate on other particular tokens
|
|
// e.g. ')'
|
|
|
|
if ((tk.tk_type() == tokentype::tk_then)
|
|
|| (tk.tk_type() == tokentype::tk_else)
|
|
|| (tk.tk_type() == tokentype::tk_semicolon))
|
|
{
|
|
this->on_parsed_expression(expr, p_psm);
|
|
this->on_token(tk, p_psm);
|
|
return;
|
|
}
|
|
|
|
Super::on_parsed_expression_with_token(expr, tk, p_psm);
|
|
}
|
|
|
|
bool
|
|
DIfElseSsm::pretty(const ppindentinfo & ppii) const
|
|
{
|
|
auto expr
|
|
= FacetRegistry::instance().variant<APrintable,
|
|
AExpression>(if_expr_);
|
|
assert(expr.data());
|
|
(void)expr;
|
|
|
|
return ppii.pps()->pretty_struct
|
|
(ppii,
|
|
"DIfElseSsm",
|
|
refrtag("ifstate", ifstate_),
|
|
refrtag("if_expr", expr));
|
|
}
|
|
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|