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xo-expression xo-reader: type unifier + misc improvements

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This commit is contained in:
Roland Conybeare 2025-07-26 17:28:41 -04:00
commit 75b74918b7
31 changed files with 1005 additions and 76 deletions
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98
xo-reader/src/reader/lambda_xs.cpp
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@ -5,6 +5,7 @@
#include "exprstatestack.hpp"
#include "expect_formal_arglist_xs.hpp"
#include "expect_expr_xs.hpp"
#include "expect_type_xs.hpp"
#include "xo/expression/Lambda.hpp"
namespace xo {
@ -20,6 +21,8 @@ namespace xo {
case lambdastatetype::lm_1: return "lm_1";
case lambdastatetype::lm_2: return "lm_2";
case lambdastatetype::lm_3: return "lm_3";
case lambdastatetype::lm_4: return "lm_4";
case lambdastatetype::lm_5: return "lm_5";
default: break;
}
@ -47,9 +50,11 @@ namespace xo {
lambda_xs::get_expect_str() const
{
/*
* lambda (x : f64) { ... } ;
* ^ ^ ^ ^
* | | | lm_3
* lambda (x : f64) : f64 { ... } ;
* ^ ^ ^ ^ ^ ^
* | | | | | lm_5
* | | | | lm_4:expect_expression
* | | | lm_3
* | | lm_2
* | lm_1:
* expect_expression
@ -63,8 +68,12 @@ namespace xo {
case lambdastatetype::lm_1:
return "lambda-params";
case lambdastatetype::lm_2:
return "lambda-body";
return "colon|lambda-body";
case lambdastatetype::lm_3:
return "type";
case lambdastatetype::lm_4:
return "lambda-body";
case lambdastatetype::lm_5:
return "semicolon";
}
@ -94,24 +103,12 @@ namespace xo {
p_psm->push_envframe(local_env_);
expect_expr_xs::start(p_psm);
//expect_expr_xs::start(p_psm);
} else {
exprstate::on_formal_arglist(argl, p_psm);
}
}
void
lambda_xs::on_expr(bp<Expression> expr,
parserstatemachine * p_psm)
{
if (lmxs_type_ == lambdastatetype::lm_2) {
this->lmxs_type_ = lambdastatetype::lm_3;
this->body_ = expr.promote();
} else {
exprstate::on_expr(expr, p_psm);
}
}
void
lambda_xs::on_expr_with_semicolon(bp<Expression> expr,
parserstatemachine * p_psm)
@ -120,11 +117,74 @@ namespace xo {
this->on_semicolon_token(token_type::semicolon(), p_psm);
}
void
lambda_xs::on_colon_token(const token_type & tk,
parserstatemachine * p_psm)
{
constexpr const char * c_self_name = "lambda_xs::on_colon_token";
if (lmxs_type_ == lambdastatetype::lm_2) {
this->lmxs_type_ = lambdastatetype::lm_3;
expect_type_xs::start(p_psm);
/* control reenters via .on_typedescr() */
} else {
this->illegal_input_on_token(c_self_name, tk, this->get_expect_str(), p_psm);
}
}
void
lambda_xs::on_leftbrace_token(const token_type & tk,
parserstatemachine * p_psm)
{
constexpr const char * c_self_name = "lambda_xs::on_leftbrace_token";
if (lmxs_type_ == lambdastatetype::lm_2)
this->lmxs_type_ = lambdastatetype::lm_4;
if (lmxs_type_ == lambdastatetype::lm_4) {
expect_expr_xs::start(p_psm);
/* want { to start expr sequence, that finishes on matching } */
p_psm->on_leftbrace_token(token_type::leftbrace());
} else {
this->illegal_input_on_token(c_self_name, tk, this->get_expect_str(), p_psm);
}
}
void
lambda_xs::on_typedescr(TypeDescr td,
parserstatemachine * p_psm)
{
constexpr const char * c_self_name = "lambda_xs::on_typedescr";
if (lmxs_type_ == lambdastatetype::lm_3) {
this->lmxs_type_ = lambdastatetype::lm_4;
this->explicit_return_td_ = td;
expect_expr_xs::start(p_psm);
/* control reenters via .on_expr() or .on_expr_with_semicolon() */
} else {
this->illegal_input_on_type(c_self_name, td, this->get_expect_str(), p_psm);
}
}
void
lambda_xs::on_expr(bp<Expression> expr,
parserstatemachine * p_psm)
{
constexpr const char * c_self_name = "lambda_xs::on_expr";
if (lmxs_type_ == lambdastatetype::lm_4) {
this->lmxs_type_ = lambdastatetype::lm_5;
this->body_ = expr.promote();
} else {
this->illegal_input_on_expr(c_self_name, expr, this->get_expect_str(), p_psm);
}
}
void
lambda_xs::on_semicolon_token(const token_type & tk,
parserstatemachine * p_psm)
{
if (lmxs_type_ == lambdastatetype::lm_3) {
if (lmxs_type_ == lambdastatetype::lm_5) {
/* done! */
std::unique_ptr<exprstate> self = p_psm->pop_exprstate();
@ -134,7 +194,7 @@ namespace xo {
/* top env frame recorded arguments to this lambda */
p_psm->pop_envframe();
rp<Lambda> lm = Lambda::make_from_env(name, local_env_, body_);
rp<Lambda> lm = Lambda::make_from_env(name, local_env_, explicit_return_td_, body_);
p_psm->top_exprstate().on_expr(lm, p_psm);
p_psm->top_exprstate().on_semicolon_token(tk, p_psm);