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xo-interpreter: handle assignment expressions

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This commit is contained in:
Roland Conybeare 2025-11-25 14:31:05 -05:00
commit fc2c9a5629
4 changed files with 33 additions and 2 deletions
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3
include/xo/reader/exprstate.hpp
View file

@ -172,6 +172,9 @@ namespace xo {
/** handle incoming '=' token **/
virtual void on_singleassign_token(const token_type & tk,
parserstatemachine * p_psm);
/** handle incoming ':=' token **/
virtual void on_assign_token(const token_type & tk,
parserstatemachine * p_psm);
/** handle incoming '(' token **/
virtual void on_leftparen_token(const token_type & tk,
parserstatemachine * p_psm);

6
include/xo/reader/progress_xs.hpp
View file

@ -97,7 +97,7 @@ namespace xo {
bp<Expression> expr2,
parserstatemachine * p_psm) const;
virtual const char * get_expect_str() const override;
virtual const char * get_expect_str() const final override;
virtual void on_expr(bp<Expression> expr,
parserstatemachine * p_psm) override;
@ -116,6 +116,8 @@ namespace xo {
parserstatemachine * p_psm) override;
virtual void on_singleassign_token(const token_type & tk,
parserstatemachine * p_psm) override;
virtual void on_assign_token(const token_type & tk,
parserstatemachine * p_psm) final override;
virtual void on_leftparen_token(const token_type & tk,
parserstatemachine * p_psm) override;
virtual void on_rightparen_token(const token_type & tk,
@ -129,7 +131,7 @@ namespace xo {
/* entry point for an infix operator token */
virtual void on_operator_token(const token_type & tk,
parserstatemachine * p_psm) override;
parserstatemachine * p_psm) final override;
virtual void on_bool_token(const token_type & tk,
parserstatemachine * p_psm) override;

17
src/reader/exprstate.cpp
View file

@ -216,6 +216,20 @@ namespace xo {
this->illegal_input_on_token(c_self_name, tk, exp, p_psm);
}
void
exprstate::on_assign_token(const token_type & tk,
parserstatemachine * p_psm)
{
constexpr bool c_debug_flag = true;
scope log(XO_DEBUG(c_debug_flag));
constexpr const char * c_self_name = "exprstate::on_assign_token";
const char * exp = get_expect_str();
this->illegal_input_on_token(c_self_name, tk, exp, p_psm);
}
void
exprstate::on_leftparen_token(const token_type & tk,
parserstatemachine * p_psm)
@ -445,6 +459,9 @@ namespace xo {
return;
case tokentype::tk_assign:
this->on_assign_token(tk, p_psm);
return;
case tokentype::tk_yields:
assert(false);
break;

9
src/reader/progress_xs.cpp
View file

@ -434,6 +434,13 @@ namespace xo {
this->illegal_input_on_token(c_self_name, tk, exp, p_psm);
}
void
progress_xs::on_assign_token(const token_type & tk,
parserstatemachine * p_psm)
{
this->on_operator_token(tk, p_psm);
}
void
progress_xs::on_leftparen_token(const token_type & tk,
parserstatemachine * p_psm)
@ -573,6 +580,8 @@ namespace xo {
optype
tk2op(const tokentype & tktype) {
switch (tktype) {
case tokentype::tk_assign:
return optype::op_assign;
case tokentype::tk_plus:
return optype::op_add;
case tokentype::tk_minus: