Conveniently turn a string into a tuple.
BRA2KET | = | { '['=>']', '('=>')', '{'=>'}', '<'=>'>' } |
[]= | -> | store |
Alias for []=. | ||
succ | -> | succ1 |
Interpolate. Provides a means of extenally using Ruby string interpolation mechinism.
try = "hello" str = "\#{try}!!!" String.interpolate{ str } #=> "hello!!!" NOTE: The block neccessary in order to get then binding of the caller.
CREDIT: Trans
Removes occurances of a string or regexp.
"HELLO HELLO" - "LL" #=> "HEO HEO"
CREDIT: Benjamin David Oakes
Treats self and path as representations of pathnames, joining thme together as a single path.
'home'/'trans' #=> 'home/trans'
Binary XOR of two strings.
puts "\000\000\001\001" ^ "\000\001\000\001" puts "\003\003\003" ^ "\000\001\002"
produces
"\000\001\001\000" "\003\002\001"
Centers each line of a string.
The default alignment separation is a new line ("\n"). This can be changed as can be the padding string which defaults to a single space (’ ’).
s = <<-EOS This is a test and so on EOS puts s.align_center(14)
produces
This is a test and so on
CREDIT: Trans
Align a string to the left.
The default alignment separation is a new line ("\n"). This can be changed as can be the padding string which defaults to a single space (’ ’).
s = <<-EOS This is a test and so on EOS puts s.align_left(20, "\n", '.')
produces
This is a test...... and................. so on...............
CREDIT: Trans
Align a string to the right.
The default alignment separation is a new line ("\n"). This can be changed as can be the padding string which defaults to a single space (’ ’).
s = <<-EOS This is a test and so on EOS puts s.align_right(14)
produces
This is a test and so on
CREDIT: Trans
Return a new string embraced by given brakets. If only one bracket char is given it will be placed on either side.
"wrap me".bracket('{') #=> "{wrap me}" "wrap me".bracket('--','!') #=> "--wrap me!"
CREDIT: Trans
Upacks string into bytes.
Note, this is not 100% compatible with 1.8.7+ which returns an enumerator instead of an array.
Return true if the string is capitalized, otherwise false.
"THIS".capitalized? #=> true "This".capitalized? #=> true "this".capitalized? #=> false
CREDIT: Phil Tomson
Returns an Enumerator for iterating over each line of the string, stripped of whitespace on either side.
Compare method that takes length into account. Unlike #<=>, this is compatible with succ.
"abc".cmp("abc") #=> 0 "abcd".cmp("abc") #=> 1 "abc".cmp("abcd") #=> -1 "xyz".cmp("abc") #=> 1
CREDIT: Peter Vanbroekhoven
Matches any whitespace (including newline) and replaces with a single space
@example
<<-QUERY.compress_lines SELECT name FROM users QUERY => "SELECT name FROM users"
Breaks a string up into an array based on a regular expression. Similar to scan, but includes the matches.
s = "<p>This<b>is</b>a test.</p>" s.divide( /\<.*?\>/ )
produces
["<p>This", "<b>is", "</b>a test.", "</p>"]
CREDIT: Trans
Return true if the string is lowercase (downcase), otherwise false.
"THIS".downcase? #=> false "This".downcase? #=> false "this".downcase? #=> true
CREDIT: Phil Tomson
Yields a single-character string for each character in the string. When $KCODE = ‘UTF8’, multi-byte characters are yielded appropriately.
Levenshtein distance algorithm implementation for Ruby, with UTF-8 support.
The Levenshtein distance is a measure of how similar two strings s and t are, calculated as the number of deletions/insertions/substitutions needed to transform s into t. The greater the distance, the more the strings differ.
The Levenshtein distance is also sometimes referred to as the easier-to-pronounce-and-spell ‘edit distance’.
Calculate the Levenshtein distance between two strings self and +str2+. self and +str2+ should be ASCII, UTF-8, or a one-byte-per character encoding such as ISO-8859-*.
The strings will be treated as UTF-8 if $KCODE is set appropriately (i.e. ‘u’). Otherwise, the comparison will be performed byte-by-byte. There is no specific support for Shift-JIS or EUC strings.
When using Unicode text, be aware that this algorithm does not perform normalisation. If there is a possibility of different normalised forms being used, normalisation should be performed beforehand.
CREDIT: Paul Battley
Does a string end with the given suffix?
"hello".end_with?("lo") #=> true "hello".end_with?("to") #=> false
CREDIT: Lucas Carlson, Blaine Cook
Expands tabs to n spaces. Non-destructive. If n is 0, then tabs are simply removed. Raises an exception if n is negative.
"\t\tHey".expand_tab(2) #=> " Hey"
Thanks to GGaramuno for a more efficient algorithm. Very nice.
CREDIT: Gavin Sinclair, Noah Gibbs, GGaramuno
Returns a new string with all new lines removed from adjacent lines of text.
s = "This is\na test.\n\nIt clumps\nlines of text." s.fold
produces
"This is a test.\n\nIt clumps lines of text. "
One arguable flaw with this, that might need a fix: if the given string ends in a newline, it is replaced with a single space.
CREDIT: Trans
Like index but returns an array of all index locations. The reuse flag allows the trailing portion of a match to be reused for subsquent matches.
"abcabcabc".index_all('a') #=> [0,3,6] "bbb".index_all('bb', false) #=> [0] "bbb".index_all('bb', true) #=> [0,1]
TODO: Culd probably be defined for Indexable in general too.
Provides a margin controlled string.
x = %Q{ | This | is | margin controlled! }.margin
NOTE: This may still need a bit of tweaking.
TODO: describe its limits and caveats and edge cases
CREDIT: Trans
Translate a (class or module) name to a suitable method name.
My::CoolClass.name.methodize => "my__cool_class"
Converts a string to module name representation.
This is essentially camelcase. It also converts ’/’ to ’::’ which is useful for converting paths to namespaces.
Examples
"method_name".modulize #=> "MethodName" "method/name".modulize #=> "Method::Name"
Like scan but returns MatchData ($~) rather then matched string ($&).
CREDIT: Trans
‘Natural order’ comparison of strings, e.g.
"my_prog_v1.1.0" < "my_prog_v1.2.0" < "my_prog_v1.10.0"
which does not follow alphabetically. A secondary parameter, if set to true, makes the comparison case insensitive.
"Hello.10".natcmp("Hello.1") #=> -1 TODO: Invert case flag?
CREDIT: Alan Davies, Martin Pool
Returns n characters of the string. If n is positive the characters are from the beginning of the string. If n is negative from the end of the string.
Alternatively a replacement string can be given, which will replace the n characters.
str = "this is text" str.nchar(4) #=> "this" str.nchar(4, 'that') #=> "that" str #=> "that is text"
Returns an Enumerator for iterating over each line of the string, void of the termining newline character, in contrast to lines which retains it.
Return a new string embraced by given quotes. If no quotes are specified, then assumes single quotes.
"quote me".quote #=> "'quote me'" "quote me".quote(2) #=> "\"quote me\""
CREDIT: Trans
Like index_all but returns an array of Ranges.
"abc123abc123".range_all('abc') #=> [0..2, 6..8] TODO: Add offset, perhaps ?
CREDIT: Trans
Returns an array of ranges mapping the characters per line.
"this\nis\na\ntest".range_of_line #=> [0..4, 5..7, 8..9, 10..13]
CREDIT: Trans
Apply a set of rules (regular expression matches) to the string.
The rules must be applied in order! So we cannot use a hash because the ordering is not guaranteed! we use an array instead.
The array containing rule-pairs (match, write).
The rewritten string.
CREDIT: George Moschovitis
Breaks a string up into an array based on a regular expression. Similar to scan, but includes the matches.
s = "<p>This<b>is</b>a test.</p>" s.shatter( /\<.*?\>/ )
produces
["<p>", "This", "<b>", "is", "</b>", "a test.", "</p>"]
CREDIT: Trans
A fuzzy matching mechanism. Returns a score from 0-1, based on the number of shared edges. To be effective, the strings must be of length 2 or greater.
"Alexsander".fuzzy_match( "Aleksander" ) #=> 0.9
The way it works:
"alexsander" -> [ alexsander, alexsand, alexsan ... lexsand ... san ... an, etc ] "aleksander" -> [ aleksander, aleksand ... etc. ]
Above example, once reduced -> [ ale, sander ]
Still a bit rough. Any suggestions for improvement are welcome.
CREDIT: Derek Lewis.
This is basically the same as store, but it acts like slice! when given only one argument.
Essentlay slice, but writes rather than reads.
a = "HELLO" a.splice("X", 1) a #=> "HXLLO" a = "HELLO" a.splice(1) #=> "E" a #=> "HLLO"
CREDIT: Trans
Does a string start with the given prefix?
"hello".start_with?("he") #=> true "hello".start_with?("to") #=> false
CREDIT: Lucas Carlson, Blaine Cook
Allows succ to take n step increments.
"abc".succ #=> "abd" "abc".succ(4) #=> "abg" "abc".succ(24) #=> "aca"
CREDIT: Trans
Preserves relative tabbing. The first non-empty line ends up with n spaces before nonspace.
CREDIT: Gavin Sinclair
Interpret common affirmative string meanings as true, otherwise false. Balnk sapce and case are ignored. The following strings that will return true:
<tt>true</tt>,<tt>yes</tt>,<tt>on</tt>,<tt>t</tt>,<tt>1</tt>,<tt>y</tt>,<tt>==</tt>
Examples:
"true".to_b #=> true "yes".to_b #=> true "no".to_b #=> false "123".to_b #=> false
Turns a string into a regular expression. By default it will escape all characters. Use false argument to turn off escaping.
"[".to_rx #=> /\[/
CREDIT: Trans
Translates a string in the form on a set of numerical and/or alphanumerical characters separated by non-word characters (eg \W+) into a Tuple. The values of the tuple will be converted to integers if they are purely numerical.
'1.2.3a'.to_t #=> [1,2,"3a"]
It you would like to control the interpretation of each value as it is added to the tuple you can supply a block.
'1.2.3a'.to_t { |v| v.upcase } #=> ["1","2","3A"]
This method calls Tuple.cast_from_string.
Return a new string embraced by given brakets. If only one bracket char is given it will be placed on either side.
"{unwrap me}".debracket('{') #=> "unwrap me" "--unwrap me!".debracket('--','!') #=> "unwrap me!"
CREDIT: Trans
Is the string upcase/uppercase?
"THIS".upcase? #=> true "This".upcase? #=> false "this".upcase? #=> false
CREDIT: Phil Tomson
Upcase first letter.
NOTE: One might argue that this method should behave the same as +upcase+ and rather this behavior should be in place of +captialize+. Probably so, but since Matz has already defined +captialize+ the way it is, this name seems most fitting to the missing behavior.
Prepend an "@" to the beginning of a string to make a instance variable name. This also replaces non-valid characters with underscores.
Word wrap a string not exceeding max width.
puts "this is a test".word_wrap(4)
produces
this is a test
This is basic implementation of word wrap, but smart enough to suffice for most use cases.
CREDIT: Gavin Kistner, Dayne Broderson
As with word_wrap, but modifies the string in place.
CREDIT: Gavin Kistner, Dayne Broderson