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xo-expression: generalize envframestack + handle explicit lm retturn

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This commit is contained in:
Roland Conybeare 2025-07-28 13:16:09 -04:00
commit 4ab3a8499b
5 changed files with 56 additions and 30 deletions
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16
include/xo/expression/Environment.hpp
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@ -6,6 +6,7 @@
#pragma once
#include "xo/refcnt/Refcounted.hpp"
#include "Variable.hpp"
#include "binding_path.hpp"
#include "xo/indentlog/print/pretty.hpp"
@ -14,6 +15,13 @@ namespace xo {
namespace scm {
class Expression;
/** @class Environment
* @brief Abstract interface for tracking variable bindings
*
* When parsing (see xo-reader): rhs will always be a variable.
* When generating code (see xo-jit): rhs can be any expression,
* for example a Lambda.
**/
class Environment : public ref::Refcount {
public:
/** true if this is toplevel (global) environment.
@ -36,6 +44,14 @@ namespace xo {
**/
virtual bp<Expression> lookup_var(const std::string & vname) const = 0;
/** like @ref lookup_var but do not delegate to parent environment **/
virtual bp<Expression> lookup_local(const std::string & vname) const = 0;
/** create/replace local variable @p target.
* Narrow use case: intended for when Environment represents a top-level session environment
**/
virtual void upsert_local(bp<Variable> target) = 0;
virtual void print(std::ostream & os) const = 0;
virtual std::uint32_t pretty_print(const xo::print::ppindentinfo & ppii) const = 0;
};