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xo-reader2 stack: top-level lambda w/ apply parses

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This commit is contained in:
Roland Conybeare 2026-02-05 15:45:40 -05:00
commit ca1370570b
46 changed files with 329 additions and 191 deletions
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26
include/xo/reader2/ParserStateMachine.hpp
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@ -9,6 +9,7 @@
#include <xo/expression2/DGlobalSymtab.hpp>
#include <xo/expression2/DLocalSymtab.hpp>
#include <xo/expression2/DVariable.hpp>
#include <xo/expression2/VarRef.hpp>
#include <xo/expression2/StringTable.hpp>
#include <xo/tokenizer2/Token.hpp>
#include <xo/object2/DArray.hpp>
@ -89,8 +90,8 @@ 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);
/** get variable reference for @p symbolname in current context, or else nullptr **/
DVarRef * lookup_varref(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.
@ -141,17 +142,6 @@ namespace xo {
**/
void on_parsed_expression(obj<AExpression> expr);
/** update state to respond to parsed expression @p expr
* (from nested parsing state), with trailing semicolon.
*
* Need to distinguish cases like:
* 6 // ; allowed
* f(6 // ) allowed ; forbidden
* 6 + // ) forbidden ; forbidden
*
**/
void on_parsed_expression_with_semicolon(obj<AExpression> expr);
/** update state to respond to parsed expression @p expr
* (from nested parsing state), with trailing token @p tk.
*
@ -232,6 +222,16 @@ namespace xo {
obj<AExpression>,
std::string_view expect_str);
/** report illegal parsed expression @p expr from nested ssm @p ssm_name,
* presented with immediately-following input token @p tk
* Introducing as placeholder; not clear if this will be reachable
* in full parser
**/
void illegal_parsed_expression_with_token(std::string_view ssm_name,
obj<AExpression> expr,
const Token & tk,
std::string_view expect_str);
/** report error - no binding for variable @p sym
**/
void error_unbound_variable(std::string_view ssm_name,