133 lines
4.8 KiB
C++
133 lines
4.8 KiB
C++
/** @file define_xs.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "xo/expression/DefineExpr.hpp"
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#include "xo/expression/ConvertExpr.hpp"
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#include "exprstate.hpp"
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#include "xo/indentlog/print/ppdetail_atomic.hpp"
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//#include <cstdint>
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namespace xo {
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namespace scm {
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/**
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* def foo : f64 = 1 ;
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* ^ ^ ^ ^ ^ ^ ^ ^
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* | | | | | | | (done)
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* | | | | | | def_6:expect_rhs_expression:expr_progress
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* | | | | | def_5:expect_rhs_expression
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* | | | | def_4
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* | | | def_3:expect_type
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* | | def_2
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* | def_1:expect_symbol
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* def_0
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* expect_toplevel_expression_sequence
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*
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* def_0 --on_def_token()--> def_1
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* def_1 --on_symbol()--> def_2
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* def_2 --on_colon_token()--> def_3
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* --on_singleassign_token()--> def_5
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* def_3 --on_typedescr()--> def_4
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* def_4 --on_singleassign_token()--> def_5
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* def_5 --on_expr()--> def_6
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* def_6 --on_semicolon_token()--> (done)
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*
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* def_1:expect_symbol: got 'def' keyword, symbol to follow
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* def_1: got symbol name
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* def_3:expect_symbol got (optional) colon, type name to follow
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* def_4: got symbol type
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* def_6:expect_rhs_expression got (optional) equal sign, value to follow
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* (done): definition complete, pop exprstate from stack
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*
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**/
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enum class defexprstatetype {
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invalid = -1,
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def_0,
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def_1,
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def_2,
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def_3,
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def_4,
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def_5,
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def_6,
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n_defexprstatetype,
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};
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extern const char * defexprstatetype_descr(defexprstatetype x);
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std::ostream &
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operator<<(std::ostream & os, defexprstatetype x);
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/** @class define_xs
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* @brief state to provide parsing of a define-expression
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**/
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class define_xs : public exprstate {
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public:
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using DefineExprAccess = xo::ast::DefineExprAccess;
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using ConvertExprAccess = xo::ast::ConvertExprAccess;
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public:
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define_xs(rp<DefineExprAccess> def_expr);
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virtual ~define_xs() = default;
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static const define_xs * from(const exprstate * x) { return dynamic_cast<const define_xs *>(x); }
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static void start(parserstatemachine * p_psm);
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defexprstatetype defxs_type() const { return defxs_type_; }
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/** @return expected input in current state **/
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virtual const char * get_expect_str() const override;
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virtual void on_expr(bp<Expression> expr,
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parserstatemachine * p_psm) override;
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virtual void on_expr_with_semicolon(bp<Expression> expr,
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parserstatemachine * p_psm) override;
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virtual void on_symbol(const std::string & symbol_name,
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parserstatemachine * p_psm) override;
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virtual void on_typedescr(TypeDescr td,
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parserstatemachine * p_psm) override;
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virtual void on_def_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_colon_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_semicolon_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_singleassign_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_rightparen_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_i64_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_f64_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void print(std::ostream & os) const override;
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private:
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static std::unique_ptr<define_xs> make();
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private:
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defexprstatetype defxs_type_;
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/** scaffold a define-expression here **/
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rp<DefineExprAccess> def_expr_;
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/** scafford a convert-expression here.
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* May be nested within a def_expr
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**/
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rp<ConvertExprAccess> cvt_expr_;
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};
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} /*namespace scm*/
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#ifndef ppdetail_atomic
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namespace print {
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PPDETAIL_ATOMIC(xo::scm::defexprstatetype);
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}
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#endif
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} /*namespace xo*/
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/** end define_xs.hpp **/
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