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xo-expression xo-reader: parser improvements, prep type inf/unify

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This commit is contained in:
Roland Conybeare 2025-07-28 09:12:41 -04:00
commit f3fde735da
18 changed files with 274 additions and 45 deletions
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37
xo-expression/src/expression/GeneralizedExpression.cpp
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@ -6,6 +6,43 @@
namespace xo {
namespace ast {
namespace {
using xo::scm::prefix_type;
prefix_type exprtype2prefix(exprtype x)
{
switch (x) {
case exprtype::invalid: assert(false); break;
case exprtype::constant: return prefix_type::from_chars("k");
case exprtype::primitive: return prefix_type::from_chars("pm");
case exprtype::define: return prefix_type::from_chars("def");
case exprtype::assign: return prefix_type::from_chars("=");
case exprtype::apply: return prefix_type::from_chars("@");
case exprtype::lambda: return prefix_type::from_chars("lm");
case exprtype::variable: return prefix_type::from_chars("var");
case exprtype::ifexpr: return prefix_type::from_chars("if");
case exprtype::sequence: return prefix_type::from_chars("seq");
case exprtype::convert: return prefix_type::from_chars("cvt");
case exprtype::n_expr: assert(false); break;
}
return prefix_type::from_chars("?expr");
}
}
GeneralizedExpression::GeneralizedExpression(exprtype extype,
TypeDescr valuetype)
: extype_{extype},
valuetype_ref_{type_ref::dwim(exprtype2prefix(extype), valuetype)}
{}
GeneralizedExpression::GeneralizedExpression(exprtype extype,
prefix_type prefix,
TypeDescr valuetype)
: extype_{extype},
valuetype_ref_{type_ref::dwim(prefix, valuetype)}
{}
std::string
GeneralizedExpression::display_string() const {
return tostr(*this);