Results for: "String#[]"

‘foo #{bar}` ^^^^^^^^^^^^

‘foo #{bar}` ^^^^^^^^^^^^

A field representing the trailing comments.

Enumerator::Chain is a subclass of Enumerator, which represents a chain of enumerables that works as a single enumerator.

This type of objects can be created by Enumerable#chain and Enumerator#+.

Enumerator::ArithmeticSequence is a subclass of Enumerator, that is a representation of sequences of numbers with common difference. Instances of this class can be generated by the Range#step and Numeric#step methods.

The class can be used for slicing Array (see Array#slice) or custom collections.

Fiddle::Pointer is a class to handle C pointers

FIXME: This isn’t documented in Nutshell.

Since MonitorMixin.new_cond returns a ConditionVariable, and the example above calls while_wait and signal, this class should be documented.

This class is used as a return value from ObjectSpace::reachable_objects_from.

When ObjectSpace::reachable_objects_from returns an object with references to an internal object, an instance of this class is returned.

You can use the type method to check the type of the internal object.

OpenSSL::Digest allows you to compute message digests (sometimes interchangeably called “hashes”) of arbitrary data that are cryptographically secure, i.e. a Digest implements a secure one-way function.

One-way functions offer some useful properties. E.g. given two distinct inputs the probability that both yield the same output is highly unlikely. Combined with the fact that every message digest algorithm has a fixed-length output of just a few bytes, digests are often used to create unique identifiers for arbitrary data. A common example is the creation of a unique id for binary documents that are stored in a database.

Another useful characteristic of one-way functions (and thus the name) is that given a digest there is no indication about the original data that produced it, i.e. the only way to identify the original input is to “brute-force” through every possible combination of inputs.

These characteristics make one-way functions also ideal companions for public key signature algorithms: instead of signing an entire document, first a hash of the document is produced with a considerably faster message digest algorithm and only the few bytes of its output need to be signed using the slower public key algorithm. To validate the integrity of a signed document, it suffices to re-compute the hash and verify that it is equal to that in the signature.

You can get a list of all digest algorithms supported on your system by running this command in your terminal:

openssl list -digest-algorithms

Among the OpenSSL 1.1.1 supported message digest algorithms are:

• SHA224, SHA256, SHA384, SHA512, SHA512-224 and SHA512-256

• SHA3-224, SHA3-256, SHA3-384 and SHA3-512

• BLAKE2s256 and BLAKE2b512

Each of these algorithms can be instantiated using the name:

digest = OpenSSL::Digest.new('SHA256')

“Breaking” a message digest algorithm means defying its one-way function characteristics, i.e. producing a collision or finding a way to get to the original data by means that are more efficient than brute-forcing etc. Most of the supported digest algorithms can be considered broken in this sense, even the very popular MD5 and SHA1 algorithms. Should security be your highest concern, then you should probably rely on SHA224, SHA256, SHA384 or SHA512.

Hashing a file

data = File.binread('document')
sha256 = OpenSSL::Digest.new('SHA256')
digest = sha256.digest(data)

Hashing several pieces of data at once

data1 = File.binread('file1')
data2 = File.binread('file2')
data3 = File.binread('file3')
sha256 = OpenSSL::Digest.new('SHA256')
sha256 << data1
sha256 << data2
sha256 << data3
digest = sha256.digest

Reuse a Digest instance

data1 = File.binread('file1')
sha256 = OpenSSL::Digest.new('SHA256')
digest1 = sha256.digest(data1)

data2 = File.binread('file2')
sha256.reset
digest2 = sha256.digest(data2)

Subclasses ‘BadAlias` for backwards compatibility

This class works in conjunction with Psych::Parser to build an in-memory parse tree that represents a YAML document.

Example

parser = Psych::Parser.new Psych::TreeBuilder.new
parser.parse('--- foo')
tree = parser.handler.root

See Psych::Handler for documentation on the event methods used in this class.

Raised when OLE query failed.

WIN32OLE::Variable objects represent OLE variable information.

WIN32OLE::Variant objects represents OLE variant.

Win32OLE converts Ruby object into OLE variant automatically when invoking OLE methods. If OLE method requires the argument which is different from the variant by automatic conversion of Win32OLE, you can convert the specified variant type by using WIN32OLE::Variant class.

param = WIN32OLE::Variant.new(10, WIN32OLE::VARIANT::VT_R4)
oleobj.method(param)

WIN32OLE::Variant does not support VT_RECORD variant. Use WIN32OLE::Record class instead of WIN32OLE::Variant if the VT_RECORD variant is needed.

Subclass of Zlib::Error. This error is raised when the zlib stream is currently in progress.

For example:

inflater = Zlib::Inflate.new
inflater.inflate(compressed) do
  inflater.inflate(compressed) # Raises Zlib::InProgressError
end

Zlib:Inflate is the class for decompressing compressed data. Unlike Zlib::Deflate, an instance of this class is not able to duplicate (clone, dup) itself.