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xo-reader: feat: mvp lambda parsing [untested]

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This commit is contained in:
Roland Conybeare 2024-08-17 13:26:57 -04:00
commit 1628d8f44c
5 changed files with 134 additions and 27 deletions
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47
include/xo/reader/expect_formal_arglist_xs.hpp
View file

@ -11,34 +11,63 @@
namespace xo {
namespace scm {
/**
* ( name(1) : type(1) , ..., )
* ^ ^ ^ ^ ^
* | | | | |
* | | | | argl_1b
* | argl_1a | argla
* argl_0 argl_1b
*
* argl_0 --on_leftparen_token()--> argl_1a
* argl_1a --on_formal()--> argl_1b
* argl_1b -+-on_comma_token()--> argl_1a
* \-on_rightparen_token()--> (done)
**/
enum class formalarglstatetype {
invalid = -1,
argl_0,
argl_1,
argl_1a,
argl_1b,
n_formalarglstatetype,
};
extern const char *
formalarglstatetype_descr(formalarglstatetype x);
inline std::ostream &
operator<< (std::ostream & os, formalarglstatetype x) {
os << formalarglstatetype_descr(x);
return os;
}
/** @class expect_formal_arglist
* @brief parser state-machine for a formal parameter list
*
* ( name(1) : type(1), ..., )
* ^
* |
* argl_0
**/
class expect_formal_arglist_xs : public exprstate {
public:
using Variable = xo::ast::Variable;
public:
expect_formal_arglist_xs();
static std::unique_ptr<expect_formal_arglist_xs> make();
const std::vector<formal_arg> & argl() const { return argl_; }
virtual void on_leftparen_token(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_formal(const rp<Variable> & formal,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_comma_token(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_rightparen_token(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void print(std::ostream & os) const override;
private:
/** parsing state-machine state **/
@ -46,7 +75,7 @@ namespace xo {
/** populate with (parmaeter-name, parameter-type) list
* as they're encountered
**/
std::vector<formal_arg> argl_;
std::vector<rp<Variable>> argl_;
};
} /*namespace scm*/
} /*namespace xo*/

7
include/xo/reader/expect_formal_xs.hpp
View file

@ -17,6 +17,9 @@ namespace xo {
* | formal_1
* formal_0
*
* formal_0 --on_symbol()--> formal_1
* formal_1 --on_colon_token()--> formal_2
* formal_2 --on_typedescr()--> (done)
**/
enum class formalstatetype {
invalid = -1,
@ -44,6 +47,8 @@ namespace xo {
public:
expect_formal_xs() = default;
static std::unique_ptr<expect_formal_xs> make();
virtual void on_symbol(const std::string & symbol_name,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
@ -68,7 +73,7 @@ namespace xo {
private:
/** parsing state-machine state **/
formalstatetype formalxs_type_;
formalstatetype formalxs_type_ = formalstatetype::formal_0;
/** populate with {parameter-name, parameter-type}
* as they're encountered
**/