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xo-reader: prep: virtual-ize exprstate methods

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This commit is contained in:
Roland Conybeare 2024-08-07 16:05:21 -04:00
commit e58f1ac62d
1 changed files with 38 additions and 42 deletions
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76
include/xo/reader/parser.hpp
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@ -82,6 +82,7 @@ namespace xo {
: exs_type_{exs_type},
gen_expr_{std::move(candidate_expr)},
def_expr_{std::move(def_expr)} {}
virtual ~exprstate() = default;
static std::unique_ptr<exprstate> expect_toplevel_expression_sequence() {
return std::make_unique<exprstate>(exprstate(exprstatetype::expect_toplevel_expression_sequence, nullptr, nullptr));
@ -110,59 +111,59 @@ namespace xo {
/** true iff this parsing state admits a 'def' keyword
* as next token
**/
bool admits_definition() const;
virtual bool admits_definition() const;
/** true iff this parsing state admits a symbol as next token **/
bool admits_symbol() const;
virtual bool admits_symbol() const;
/** true iff this parsing state admits a colon as next token **/
bool admits_colon() const;
virtual bool admits_colon() const;
/** true iff this parsing state admits a semicolon as next token **/
bool admits_semicolon() const;
virtual bool admits_semicolon() const;
/** true iff this parsing state admits a singleassign '=' as next token **/
bool admits_singleassign() const;
virtual bool admits_singleassign() const;
/** true iff this parsing state admits a leftparen '(' as next token **/
bool admits_leftparen() const;
virtual bool admits_leftparen() const;
/** truee iff this parsing state admits a rightparen ')' as next token **/
bool admits_rightparen() const;
virtual bool admits_rightparen() const;
/** true iff this parsing state admits a 64-bit floating point literal token **/
bool admits_f64() const;
virtual bool admits_f64() const;
/** update exprstate in response to incoming token @p tk,
* forward instructions to parent parser
**/
void on_input(const token_type & tk, exprstatestack * p_stack, rp<Expression> * p_emit_expr);
/** update exprstate in response to a successfully-parsed subexpression **/
void on_expr(ref::brw<Expression> expr,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_expr(ref::brw<Expression> expr,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
/** update exprstate when expecting a symbol **/
void on_symbol(const std::string & symbol,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_symbol(const std::string & symbol,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
/** update exprstate when expeccting a typedescr **/
void on_typedescr(TypeDescr td,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_typedescr(TypeDescr td,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
/** print human-readable representation on @p os **/
void print(std::ostream & os) const;
virtual void print(std::ostream & os) const;
private:
void on_def(exprstatestack * p_stack);
void on_symbol(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
void on_colon(exprstatestack * p_stack);
void on_semicolon(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
void on_singleassign(exprstatestack * p_stack);
void on_leftparen(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
void on_rightparen(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
void on_f64(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
protected:
virtual void on_def(exprstatestack * p_stack);
virtual void on_symbol(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_colon(exprstatestack * p_stack);
virtual void on_semicolon(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_singleassign(exprstatestack * p_stack);
virtual void on_leftparen(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_rightparen(exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
virtual void on_f64(const token_type & tk,
exprstatestack * p_stack,
rp<Expression> * p_emit_expr);
private:
protected:
/**
* def foo : f64 = 1 ;
* ^ ^ ^ ^ ^ ^ ^ ^
@ -193,11 +194,6 @@ namespace xo {
* May be nested within a def_expr
**/
rp<ConvertExprAccess> cvt_expr_;
#ifdef NOT_YET
/* polymorphic state here */
std::unique_ptr<exprstateaux> state_;
#endif
}; /*exprstate*/
inline std::ostream &