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xo-reader2 stack: + xo-numeric + setup multi dispatch for *,/

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This commit is contained in:
Roland Conybeare 2026-02-18 21:47:02 -08:00
commit 911818e957
5 changed files with 106 additions and 8 deletions
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49
src/reader2/DProgressSsm.cpp
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@ -12,6 +12,8 @@
#include "ApplySsm.hpp"
#include "ParenSsm.hpp"
#include <xo/numeric/NumericPrimitives.hpp>
#include <xo/expression2/DApplyExpr.hpp>
#include <xo/expression2/detail/IExpression_DApplyExpr.hpp>
@ -118,15 +120,15 @@ namespace xo {
switch (tktype) {
case tokentype::tk_assign:
return optype::op_assign;
case tokentype::tk_plus:
case tokentype::tk_plus: // [+]
return optype::op_add;
case tokentype::tk_minus:
case tokentype::tk_minus: // [-]
return optype::op_subtract;
case tokentype::tk_star:
case tokentype::tk_star: // [*]
return optype::op_multiply;
case tokentype::tk_slash:
case tokentype::tk_slash: // [/]
return optype::op_divide;
case tokentype::tk_cmpeq:
case tokentype::tk_cmpeq: // [==]
return optype::op_equal;
case tokentype::tk_cmpne:
return optype::op_not_equal;
@ -297,12 +299,12 @@ namespace xo {
break;
case tokentype::tk_star:
case tokentype::tk_slash:
case tokentype::tk_minus:
case tokentype::tk_cmpeq:
this->on_operator_token(tk, p_psm);
return;
case tokentype::tk_slash:
case tokentype::tk_cmpne:
case tokentype::tk_type:
case tokentype::tk_lambda:
@ -1283,9 +1285,40 @@ namespace xo {
break;
case optype::op_divide:
// TODO: implement binary operator expression assembly
assert(false);
{
auto pm_obj = (with_facet<AGCObject>::mkobj
(&NumericPrimitives::s_div_gco_gco_pm));
auto fn_expr = (DConstant::make
(p_psm->expr_alloc(), pm_obj));
/* note:
* 1. don't assume we know lhs_ / rhs_ value types yet.
* perhaps have expression like
* f(..) * g(..)
* where f is the function that contains current ssm.
*
* 2. consequence: we need representation for
* polymorphic multiply on unknown numeric arguments.
*
* 3. TypeRef::dwim(..) is a placeholder.
* Plan to later provide abstract interpreter
* (ie compiler pass :) to drive type inference/unification
*
* 4. Alternatively could supply type-annotation syntax
* so human can assist inference; context here is we want
* to automate the boring stuff
*/
TypeRef tref = TypeRef::dwim
(TypeRef::prefix_type::from_chars("_div_gco"),
nullptr);
return DApplyExpr::make2(p_psm->expr_alloc(),
tref, fn_expr, lhs_, rhs_);
}
break;
case optype::op_subtract: /* editor bait: op_minus */
{
auto pm_obj = (with_facet<AGCObject>::mkobj