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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 44f463e359
9 changed files with 55 additions and 43 deletions
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6
include/xo/reader/parserstatemachine.hpp
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@ -59,13 +59,13 @@ namespace xo {
void upsert_var(bp<Variable> x);
/** @return available variable bindings in current parsing state **/
bp<LocalEnv> top_envframe() const;
bp<Environment> top_envframe() const;
/** @return frame @p i levels from the top **/
bp<LocalEnv> lookup_envframe(std::size_t i) const;
bp<Environment> lookup_envframe(std::size_t i) const;
/** push frame @p x (with new variable bindings) onto environment stack **/
void push_envframe(const rp<LocalEnv> & x);
/** @return pop innermost environment frame and return it **/
rp<LocalEnv> pop_envframe();
rp<Environment> pop_envframe();
/** @return number of stacked environment frames **/
size_t env_stack_size() const { return env_stack_.size(); }