Results for: "OptionParser"

JSON#parse!

Calls

parse(source, opts)

with source and possibly modified opts.

Differences from JSON.parse:

Option max_nesting, if not provided, defaults to false, which disables checking for nesting depth.
Option allow_nan, if not provided, defaults to true.

Psych::parse

Parse a YAML string in yaml. Returns the Psych::Nodes::Document. filename is used in the exception message if a Psych::SyntaxError is raised.

Raises a Psych::SyntaxError when a YAML syntax error is detected.

Example:

Psych.parse("---\n - a\n - b") # => #<Psych::Nodes::Document:0x00>

begin
  Psych.parse("--- `", filename: "file.txt")
rescue Psych::SyntaxError => ex
  ex.file    # => 'file.txt'
  ex.message # => "(file.txt): found character that cannot start any token"
end

See Psych::Nodes for more information about YAML AST.

Gem::configuration

The standard configuration object for gems.

Gem::configuration=

Use the given configuration object (which implements the ConfigFile protocol) as the standard configuration object.

URI::parse

Returns a new URI object constructed from the given string uri:

URI.parse('https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top')
# => #<URI::HTTPS https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top>
URI.parse('http://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top')
# => #<URI::HTTP http://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top>

It’s recommended to first ::escape string uri if it may contain invalid URI characters.

Prism::parse

Mirror the Prism.parse API by using the serialization API.

DateTime#second_fraction

Returns the fractional part of the second in range (Rational(0, 1)…Rational(1, 1)):

DateTime.new(2001, 2, 3, 4, 5, 6.5).sec_fraction # => (1/2)

Set#proper_superset?

Returns true if the set is a proper superset of the given set.

TracePoint#raised_exception

Returns the exception raised on the :raise event or rescued on the :rescue event.

FileUtils::have_option?

Returns true if method mid accepts the given option opt, false otherwise; the arguments may be strings or symbols:

FileUtils.have_option?(:chmod, :noop) # => true
FileUtils.have_option?('chmod', 'secure') # => false

FileUtils::options_of

Returns an array of the string keyword name for method mid; the argument may be a string or a symbol:

FileUtils.options_of(:rm) # => ["force", "noop", "verbose"]
FileUtils.options_of('mv') # => ["force", "noop", "verbose", "secure"]

Prism::dump_options

Convert the given options into a serialized options string.

JSON#merge_dump_options

No documentation available

SyntaxSuggest::use_prism_parser?

SyntaxSuggest.use_prism_parser? [Private]

Tells us if the prism parser is available for use or if we should fallback to ‘Ripper`

Gem::Command#create_option_parser

Creates an option parser and fills it in with the help info for the command.

Thread::abort_on_exception

Returns the status of the global “abort on exception” condition.

The default is false.

When set to true, if any thread is aborted by an exception, the raised exception will be re-raised in the main thread.

Can also be specified by the global $DEBUG flag or command line option -d.

Thread::abort_on_exception=

When set to true, if any thread is aborted by an exception, the raised exception will be re-raised in the main thread. Returns the new state.

Thread.abort_on_exception = true
t1 = Thread.new do
  puts  "In new thread"
  raise "Exception from thread"
end
sleep(1)
puts "not reached"

This will produce:

In new thread
prog.rb:4: Exception from thread (RuntimeError)
 from prog.rb:2:in `initialize'
 from prog.rb:2:in `new'
 from prog.rb:2

Thread::report_on_exception

Returns the status of the global “report on exception” condition.

The default is true since Ruby 2.5.

All threads created when this flag is true will report a message on $stderr if an exception kills the thread.

Thread.new { 1.times { raise } }

will produce this output on $stderr:

#<Thread:...> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
        2: from -e:1:in `block in <main>'
        1: from -e:1:in `times'

This is done to catch errors in threads early. In some cases, you might not want this output. There are multiple ways to avoid the extra output:

If the exception is not intended, the best is to fix the cause of the exception so it does not happen anymore.
If the exception is intended, it might be better to rescue it closer to where it is raised rather then let it kill the Thread.
If it is guaranteed the Thread will be joined with Thread#join or Thread#value, then it is safe to disable this report with Thread.current.report_on_exception = false when starting the Thread. However, this might handle the exception much later, or not at all if the Thread is never joined due to the parent thread being blocked, etc.

Thread::report_on_exception=

Returns the new state. When set to true, all threads created afterwards will inherit the condition and report a message on $stderr if an exception kills a thread:

Thread.report_on_exception = true
t1 = Thread.new do
  puts  "In new thread"
  raise "Exception from thread"
end
sleep(1)
puts "In the main thread"