morph::ui::Environment Class Reference

What an evaluated expression reads: the interpreter implements it over its reactive values. More...

#include <expression.hpp>

Inheritance diagram for morph::ui::Environment:

Public Member Functions
	Environment (Environment const &)=delete
Environment &	operator= (Environment const &)=delete
	Environment (Environment &&)=delete
Environment &	operator= (Environment &&)=delete
virtual Value	ref (std::string_view head, std::span< std::string const > path) const =0
	Reads {"ref": "head.path"}.
virtual Value	row (std::span< std::string const > path) const =0
	Reads {"row": "path"}.
virtual Value	control (ExprKind form, std::string_view name) const =0
	Reads query, pending, error, result, errorKind or can.
virtual Value	pref (std::string_view point, std::span< std::string const > path) const =0
	Reads {"pref": "point.path"}.
virtual Value	client (ExprKind form, std::string_view name) const =0
	Reads env, session or host.
virtual FormatContext const &	formatting () const =0
	The formatting facts.
virtual void	report (std::string_view path, std::string_view reason) const =0
	Reports a runtime error of an expression.

Detailed Description

What an evaluated expression reads: the interpreter implements it over its reactive values.

Every read returns a value; a name the environment does not hold reads as null. report is the client's diagnostic channel: the evaluator reports each runtime error there, with the expression's path.

Definition at line 1066 of file expression.hpp.

Member Function Documentation

ref()

virtual Value morph::ui::Environment::ref ( std::string_view head, std::span< std::string const > path ) const

nodiscardpure virtual

Reads {"ref": "head.path"}.

Parameters

head	The first segment.
path	The segments after it.

Returns

The value.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

row()

virtual Value morph::ui::Environment::row ( std::span< std::string const > path ) const

nodiscardpure virtual

Reads {"row": "path"}.

Parameters

path	The field path inside the innermost row.

Returns

The value.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

control()

virtual Value morph::ui::Environment::control ( ExprKind form, std::string_view name ) const

nodiscardpure virtual

Reads query, pending, error, result, errorKind or can.

Parameters

form	The form.
name	The query or mutation.

Returns

The value: a bool for pending and can.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

pref()

virtual Value morph::ui::Environment::pref ( std::string_view point, std::span< std::string const > path ) const

nodiscardpure virtual

Reads {"pref": "point.path"}.

Parameters

point	The customization point.
path	The segments after it.

Returns

The value.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

client()

virtual Value morph::ui::Environment::client ( ExprKind form, std::string_view name ) const

nodiscardpure virtual

Reads env, session or host.

Parameters

form	The form.
name	The name read.

Returns

The value.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

formatting()

virtual FormatContext const & morph::ui::Environment::formatting ( ) const

nodiscardpure virtual

The formatting facts.

Returns

The context the display functions and t use.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

report()

virtual void morph::ui::Environment::report ( std::string_view path, std::string_view reason ) const

pure virtual

Reports a runtime error of an expression.

Parameters

path	The JSON Pointer of the expression node that failed.
reason	What went wrong.

Implemented in morph::ui::detail::host::ParamsEnv, morph::ui::detail::ScopeEnv, and morph::ui::StaticEnvironment.

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The documentation for this class was generated from the following file:

• morph/ui/expression.hpp