Counts symbols for each Symbol type.
This method is only for MRI developers interested in performance and memory usage of Ruby programs.
If the optional argument, result_hash, is given, it is overwritten and returned. This is intended to avoid probe effect.
Note: The contents of the returned hash is implementation defined. It may be changed in future.
This method is only expected to work with C Ruby.
On this version of MRI, they have 3 types of Symbols (and 1 total counts).
* mortal_dynamic_symbol: GC target symbols (collected by GC) * immortal_dynamic_symbol: Immortal symbols promoted from dynamic symbols (do not collected by GC) * immortal_static_symbol: Immortal symbols (do not collected by GC) * immortal_symbol: total immortal symbols (immortal_dynamic_symbol+immortal_static_symbol)
Counts nodes for each node type.
This method is only for MRI developers interested in performance and memory usage of Ruby programs.
It returns a hash as:
{:NODE_METHOD=>2027, :NODE_FBODY=>1927, :NODE_CFUNC=>1798, ...}
If the optional argument, result_hash, is given, it is overwritten and returned. This is intended to avoid probe effect.
Note: The contents of the returned hash is implementation defined. It may be changed in future.
This method is only expected to work with C Ruby.
Counts all objects grouped by type.
It returns a hash, such as:
{
:TOTAL=>10000,
:FREE=>3011,
:T_OBJECT=>6,
:T_CLASS=>404,
# ...
}
The contents of the returned hash are implementation specific. It may be changed in future.
The keys starting with :T_ means live objects. For example, :T_ARRAY is the number of arrays. :FREE means object slots which is not used now. :TOTAL means sum of above.
If the optional argument result_hash is given, it is overwritten and returned. This is intended to avoid probe effect.
h = {} ObjectSpace.count_objects(h) puts h # => { :TOTAL=>10000, :T_CLASS=>158280, :T_MODULE=>20672, :T_STRING=>527249 }
This method is only expected to work on C Ruby.
Load yaml in to a Ruby data structure. If multiple documents are provided, the object contained in the first document will be returned. filename will be used in the exception message if any exception is raised while parsing. If yaml is empty, it returns the specified fallback return value, which defaults to false.
Raises a Psych::SyntaxError when a YAML syntax error is detected.
Example:
Psych.load("--- a") # => 'a' Psych.load("---\n - a\n - b") # => ['a', 'b'] begin Psych.load("--- `", filename: "file.txt") rescue Psych::SyntaxError => ex ex.file # => 'file.txt' ex.message # => "(file.txt): found character that cannot start any token" end
When the optional symbolize_names keyword argument is set to a true value, returns symbols for keys in Hash objects (default: strings).
Psych.load("---\n foo: bar") # => {"foo"=>"bar"} Psych.load("---\n foo: bar", symbolize_names: true) # => {:foo=>"bar"}
Raises a TypeError when ‘yaml` parameter is NilClass
NOTE: This method *should not* be used to parse untrusted documents, such as YAML documents that are supplied via user input. Instead, please use the safe_load method.
Dump Ruby object to a JSON string.
Insert text into the line at the current cursor position.
See GNU Readline’s rl_insert_text function.
Raises NotImplementedError if the using readline library does not support.
Combine two Adler-32 check values in to one. alder1 is the first Adler-32 value, adler2 is the second Adler-32 value. len2 is the length of the string used to generate adler2.
Combine two CRC-32 check values in to one. crc1 is the first CRC-32 value, crc2 is the second CRC-32 value. len2 is the length of the string used to generate crc2.
Returns whether or not automatic compaction has been enabled.
Updates automatic compaction mode.
When enabled, the compactor will execute on every major collection.
Enabling compaction will degrade performance on major collections.
Returns the Base64-encoded version of bin. This method complies with “Base 64 Encoding with URL and Filename Safe Alphabet” in RFC 4648. The alphabet uses ‘-’ instead of ‘+’ and ‘_’ instead of ‘/’. Note that the result can still contain ‘=’. You can remove the padding by setting padding as false.
Returns the Base64-decoded version of str. This method complies with “Base 64 Encoding with URL and Filename Safe Alphabet” in RFC 4648. The alphabet uses ‘-’ instead of ‘+’ and ‘_’ instead of ‘/’.
The padding character is optional. This method accepts both correctly-padded and unpadded input. Note that it still rejects incorrectly-padded input.
Start a dRuby server locally.
The new dRuby server will become the primary server, even if another server is currently the primary server.
uri is the URI for the server to bind to. If nil, the server will bind to random port on the default local host name and use the default dRuby protocol.
front is the server’s front object. This may be nil.
config is the configuration for the new server. This may be nil.
See DRbServer::new.
Start a dRuby server locally.
The new dRuby server will become the primary server, even if another server is currently the primary server.
uri is the URI for the server to bind to. If nil, the server will bind to random port on the default local host name and use the default dRuby protocol.
front is the server’s front object. This may be nil.
config is the configuration for the new server. This may be nil.
See DRbServer::new.
Stop the local dRuby server.
This operates on the primary server. If there is no primary server currently running, it is a noop.
Stop the local dRuby server.
This operates on the primary server. If there is no primary server currently running, it is a noop.
Copies a file system entry src to dest. If src is a directory, this method copies its contents recursively. This method preserves file types, c.f. symlink, directory… (FIFO, device files and etc. are not supported yet)
Both of src and dest must be a path name. src must exist, dest must not exist.
If preserve is true, this method preserves owner, group, and modified time. Permissions are copied regardless preserve.
If dereference_root is true, this method dereference tree root.
If remove_destination is true, this method removes each destination file before copy.
Copies a file system entry src to dest. If src is a directory, this method copies its contents recursively. This method preserves file types, c.f. symlink, directory… (FIFO, device files and etc. are not supported yet)
Both of src and dest must be a path name. src must exist, dest must not exist.
If preserve is true, this method preserves owner, group, and modified time. Permissions are copied regardless preserve.
If dereference_root is true, this method dereference tree root.
If remove_destination is true, this method removes each destination file before copy.
Copies file contents of src to dest. Both of src and dest must be a path name.
Copies file contents of src to dest. Both of src and dest must be a path name.
Returns an Array of methods names which have the option opt.
p FileUtils.collect_method(:preserve) #=> ["cp", "cp_r", "copy", "install"]