Emit a scalar with value and tag
Called with encoding when the YAML stream starts. This method is called once per stream. A stream may contain multiple documents.
See the constants in Psych::Parser for the possible values of encoding.
Called when the document starts with the declared version, tag_directives, if the document is implicit.
version will be an array of integers indicating the YAML version being dealt with, tag_directives is a list of tuples indicating the prefix and suffix of each tag, and implicit is a boolean indicating whether the document is started implicitly.
Given the following YAML:
%YAML 1.1 %TAG ! tag:tenderlovemaking.com,2009: --- !squee
The parameters for start_document must be this:
version # => [1, 1] tag_directives # => [["!", "tag:tenderlovemaking.com,2009:"]] implicit # => false
Called when a sequence is started.
anchor is the anchor associated with the sequence or nil. tag is the tag associated with the sequence or nil. implicit a boolean indicating whether or not the sequence was implicitly started. style is an integer indicating the list style.
See the constants in Psych::Nodes::Sequence for the possible values of style.
Here is a YAML document that exercises most of the possible ways this method can be called:
--- - !!seq [ a ] - &pewpew - b
The above YAML document consists of three lists, an outer list that contains two inner lists. Here is a matrix of the parameters sent to represent these lists:
# anchor tag implicit style [nil, nil, true, 1 ] [nil, "tag:yaml.org,2002:seq", false, 2 ] ["pewpew", nil, true, 1 ]
Called when a map starts.
anchor is the anchor associated with the map or nil. tag is the tag associated with the map or nil. implicit is a boolean indicating whether or not the map was implicitly started. style is an integer indicating the mapping style.
See the constants in Psych::Nodes::Mapping for the possible values of style.
Here is a YAML document that exercises most of the possible ways this method can be called:
---
k: !!map { hello: world }
v: &pewpew
hello: world
The above YAML document consists of three maps, an outer map that contains two inner maps. Below is a matrix of the parameters sent in order to represent these three maps:
# anchor tag implicit style [nil, nil, true, 1 ] [nil, "tag:yaml.org,2002:map", false, 2 ] ["pewpew", nil, true, 1 ]
Handles start_document events with version, tag_directives, and implicit styling.
Start a document emission with YAML version, tags, and an implicit start.
Start emitting a sequence with anchor, a tag, implicit sequence start and end, along with style.
Start emitting a YAML map with anchor, tag, an implicit start and end, and style.
Enumerate all values in this registry path.
For each value it yields key, type and data.
key is a String which contains name of key. type is a type contant kind of Win32::Registry::REG_* data is the value of this key.
Delete a registry value named name. We can not delete the ‘default’ value.
Guesses the type of the data which have been inputted into the stream. The returned value is either BINARY, ASCII, or UNKNOWN.
Duplicates the deflate stream.
See Zlib::GzipReader documentation for a description.
Returns true if stat is readable by the real user id of this process.
File.stat("testfile").readable_real? #=> true
If stat is writable by others, returns an integer representing the file permission bits of stat. Returns nil otherwise. The meaning of the bits is platform dependent; on Unix systems, see stat(2).
m = File.stat("/tmp").world_writable? #=> 511 sprintf("%o", m) #=> "777"
Make an internal copy of the source buffer. Updates to the copy will not affect the source buffer.
source = IO::Buffer.for("Hello World") # => # #<IO::Buffer 0x00007fd598466830+11 EXTERNAL READONLY SLICE> # 0x00000000 48 65 6c 6c 6f 20 57 6f 72 6c 64 Hello World buffer = source.dup # => # #<IO::Buffer 0x0000558cbec03320+11 INTERNAL> # 0x00000000 48 65 6c 6c 6f 20 57 6f 72 6c 64 Hello World
Read from buffer a value of type at offset. buffer_type should be one of symbols:
:U8: unsigned integer, 1 byte
:S8: signed integer, 1 byte
:u16: unsigned integer, 2 bytes, little-endian
:U16: unsigned integer, 2 bytes, big-endian
:s16: signed integer, 2 bytes, little-endian
:S16: signed integer, 2 bytes, big-endian
:u32: unsigned integer, 4 bytes, little-endian
:U32: unsigned integer, 4 bytes, big-endian
:s32: signed integer, 4 bytes, little-endian
:S32: signed integer, 4 bytes, big-endian
:u64: unsigned integer, 8 bytes, little-endian
:U64: unsigned integer, 8 bytes, big-endian
:s64: signed integer, 8 bytes, little-endian
:S64: signed integer, 8 bytes, big-endian
:f32: float, 4 bytes, little-endian
:F32: float, 4 bytes, big-endian
:f64: double, 8 bytes, little-endian
:F64: double, 8 bytes, big-endian
A buffer type refers specifically to the type of binary buffer that is stored in the buffer. For example, a :u32 buffer type is a 32-bit unsigned integer in little-endian format.
string = [1.5].pack('f') # => "\x00\x00\xC0?" IO::Buffer.for(string).get_value(:f32, 0) # => 1.5
Similar to get_value, except that it can handle multiple buffer types and returns an array of values.
string = [1.5, 2.5].pack('ff') IO::Buffer.for(string).get_values([:f32, :f32], 0) # => [1.5, 2.5]
Write to a buffer a value of type at offset. type should be one of symbols described in get_value.
buffer = IO::Buffer.new(8) # => # #<IO::Buffer 0x0000555f5c9a2d50+8 INTERNAL> # 0x00000000 00 00 00 00 00 00 00 00 buffer.set_value(:U8, 1, 111) # => 1 buffer # => # #<IO::Buffer 0x0000555f5c9a2d50+8 INTERNAL> # 0x00000000 00 6f 00 00 00 00 00 00 .o......
Note that if the type is integer and value is Float, the implicit truncation is performed:
buffer = IO::Buffer.new(8) buffer.set_value(:U32, 0, 2.5) buffer # => # #<IO::Buffer 0x0000555f5c9a2d50+8 INTERNAL> # 0x00000000 00 00 00 02 00 00 00 00 # ^^ the same as if we'd pass just integer 2
Write values of buffer_types at offset to the buffer. buffer_types should be an array of symbols as described in get_value. values should be an array of values to write.
buffer = IO::Buffer.new(8) buffer.set_values([:U8, :U16], 0, [1, 2]) buffer # => # #<IO::Buffer 0x696f717561746978+8 INTERNAL> # 0x00000000 01 00 02 00 00 00 00 00 ........