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xo-reader: fix+prep: setup for associative behaviore

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This commit is contained in:
Roland Conybeare 2024-08-15 00:14:55 -04:00
commit bba6898ee1
2 changed files with 106 additions and 32 deletions
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28
include/xo/reader/progress_xs.hpp
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@ -6,6 +6,7 @@
#pragma once
#include "exprstate.hpp"
#include <iostream>
//#include <cstdint>
namespace xo {
@ -22,6 +23,15 @@ namespace xo {
n_optype
};
extern const char *
optype_descr(optype x);
inline std::ostream &
operator<< (std::ostream & os, optype x) {
os << optype_descr(x);
return os;
}
/** @class progress_xs
* @brief state machine for parsing a schematica runtime-value-expression
**/
@ -74,11 +84,25 @@ namespace xo {
virtual void print(std::ostream & os) const override;
private:
/** populate an expression here **/
rp<Expression> gen_expr_;
/** assemble expression representing
* value of
* @code
* f(lhs_, rhs_)
* @endcode
*
* where f determined by @ref op_type_
**/
rp<Expression> assemble_expr();
private:
/** populate an expression here, may be followed by an operator **/
rp<Expression> lhs_;
/** infix operator, if supplied **/
optype op_type_ = optype::invalid;
/** populate an expression here, following infix operator */
rp<Expression> rhs_;
};
} /*namespace scm*/
} /*namespace xo*/