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xo-interpreter2 stack: work on variable references [WIP]

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This commit is contained in:
Roland Conybeare 2026-02-05 10:44:11 -05:00
commit 4cd4328f07
6 changed files with 274 additions and 21 deletions
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12
include/xo/reader2/ExpectExprSsm.hpp Normal file
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@ -0,0 +1,12 @@
/** @file ExpectExprSsm.hpp
*
* @author Roland Conybeare, Feb 2026
**/
#pragma once
#include "DExpectExprSsm.hpp"
#include "ssm/ISyntaxStateMachine_DExpectExprSsm.hpp"
#include "ssm/IPrintable_DExpectExprSsm.hpp"
/* end ExpectExprSsm.hpp */

8
include/xo/reader2/ParserStateMachine.hpp
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@ -89,6 +89,9 @@ namespace xo {
/** get unique (within stringtable) string, beginning with @p prefix **/
const DUniqueString * gensym(std::string_view prefix);
/** get variable defn for @p symbolname, or else nullptr **/
Binding lookup_binding(std::string_view symbolname);
/** push nested local symtab while parsing the body of a lambda expression;
* restore previous symtab at the end of lambda-expression definition.
* See @ref pop_local_symtab
@ -229,6 +232,11 @@ namespace xo {
obj<AExpression>,
std::string_view expect_str);
/** report error - no binding for variable @p sym
**/
void error_unbound_variable(std::string_view ssm_name,
std::string_view sym);
///@}
private: