abstract class Novika::Capabilities::ISystem

Included Modules

Extended Modules

Novika::ICapabilityClass

Direct Known Subclasses

Novika::Capabilities::Impl::System

Defined in:

novika/capabilities/system.cr

Class Method Summary

.id : String
.on_by_default? : Bool
.purpose : String

Instance Method Summary

#append_echo(engine, form : Form)
Enquotes and appends form to the standard output stream.
#bye(engine, code : Decimal)
Ends the program with the given exit code.
#inject(into target : Block)
Injects the vocabulary of this capability into the target block.
#monotonic(engine) : Decimal
Returns a reading from the monotonic clock, in milliseconds.
#nap(engine, millis : Decimal)
Sleeps for the given amount of milliseconds.
#readline(engine, prompt : Form) : Tuple(Quote | Nil, Boolean)
Enquotes and prints prompt to STDOUT.
#readline_star(engine, config : PromptConfig) : Tuple(Quote | Nil, Boolean)
Extended (contextful) version of #readline.
#report_error(engine, error : Error)
Reports abound an error to the standard error stream.

Instance methods inherited from module `Novika::ICapability`

Constructor methods inherited from module `Novika::ICapability`

Class Method Detail

def self.id : String #

def self.on_by_default? : Bool #

def self.purpose : String #

Instance Method Detail

abstract def append_echo(engine, form : Form) #

Enquotes and appends form to the standard output stream.

abstract def bye(engine, code : Decimal) #

Ends the program with the given exit code.

def inject(into target : Block) #

Description copied from module Novika::ICapability

Injects the vocabulary of this capability into the target block.

abstract def monotonic(engine) : Decimal #

Returns a reading from the monotonic clock, in milliseconds.

abstract def nap(engine, millis : Decimal) #

Sleeps for the given amount of milliseconds.

abstract def readline(engine, prompt : Form) : Tuple(Quote | Nil, Boolean) #

Enquotes and prints prompt to STDOUT. Waits for the user to answer, enquotes the answer (if any) and returns it together with a status boolean.

If the user answered with EOF (e.g. CTRL-D), status bool is false and answer quote is nil. Else, answer quote contains the answer and status bool is true.

abstract def readline_star(engine, config : PromptConfig) : Tuple(Quote | Nil, Boolean) #

Extended (contextful) version of #readline.

abstract def report_error(engine, error : Error) #

Reports abound an error to the standard error stream.

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