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xo-reader: wip: parsing lambda expressions [wip, non-functional]

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This commit is contained in:
Roland Conybeare 2024-08-17 01:09:17 -04:00
commit 0841fd7dbd
10 changed files with 289 additions and 5 deletions
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46
include/xo/reader/lambda_xs.hpp
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@ -10,14 +10,60 @@
namespace xo {
namespace scm {
/**
* lambda ( name(1) : type(1), ..., ) body-expr ;
* ^ ^ ^ ^
* | | | |
* lm_0 lm_1 lm_2 lm_3
*
* lm_0 --on_lambda_token()--> lm_1
* lm_1 --on_formal_arglist()--> lm_2
* lm_2 --on_expr()--> lm_3
* lm_3 --on_semicolon_token()--> (done)
**/
enum class lambdastatetype {
invalid = -1,
lm_0,
lm_1,
lm_2,
lm_3,
n_lambdastatetype
};
/** @class lambda_xs
* @brief parsing state-machine for a lambda-expression
*
**/
class lambda_xs : public exprstate {
public:
lambda_xs();
static std::unique_ptr<lambda_xs> make();
virtual void on_lambda_token(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_formal_arglist(const std::vector<rp<Variable>> & argl,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_expr(ref::brw<Expression> expr,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
virtual void on_semicolon_token(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr) override;
private:
/** parsing state-machine state **/
lambdastatetype lmxs_type_;
/** formal parameter list **/
std::vector<rp<Variable>> argl_;
/** body expression **/
rp<Expression> body_;
};
} /*namespace scm*/
} /*namespace xo*/