/usr/lib/ruby/1.8/yaml/constants.rb is in libruby1.8 1.8.7.352-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Constants used throughout the library
#
module YAML
#
# Constants
#
VERSION = '0.60'
SUPPORTED_YAML_VERSIONS = ['1.0']
#
# Parser tokens
#
WORD_CHAR = 'A-Za-z0-9'
PRINTABLE_CHAR = '-_A-Za-z0-9!?/()$\'". '
NOT_PLAIN_CHAR = '\x7f\x0-\x1f\x80-\x9f'
ESCAPE_CHAR = '[\\x00-\\x09\\x0b-\\x1f]'
INDICATOR_CHAR = '*&!|\\\\^@%{}[]='
SPACE_INDICATORS = '-#:,?'
RESTRICTED_INDICATORS = '#:,}]'
DNS_COMP_RE = "\\w(?:[-\\w]*\\w)?"
DNS_NAME_RE = "(?:(?:#{DNS_COMP_RE}\\.)+#{DNS_COMP_RE}|#{DNS_COMP_RE})"
ESCAPES = %w{\x00 \x01 \x02 \x03 \x04 \x05 \x06 \a
\x08 \t \n \v \f \r \x0e \x0f
\x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17
\x18 \x19 \x1a \e \x1c \x1d \x1e \x1f
}
UNESCAPES = {
'a' => "\x07", 'b' => "\x08", 't' => "\x09",
'n' => "\x0a", 'v' => "\x0b", 'f' => "\x0c",
'r' => "\x0d", 'e' => "\x1b", '\\' => '\\',
}
#
# Default settings
#
DEFAULTS = {
:Indent => 2, :UseHeader => false, :UseVersion => false, :Version => '1.0',
:SortKeys => false, :AnchorFormat => 'id%03d', :ExplicitTypes => false,
:WidthType => 'absolute', :BestWidth => 80,
:UseBlock => false, :UseFold => false, :Encoding => :None
}
end
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