class Verse::Truncation
A class responsible for text truncation operations
Constants
- DEFAULT_LENGTH
- DEFAULT_TRAILING
Attributes
separator[R]
text[R]
trailing[R]
Public Class Methods
new(text, options = {})
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Initialize a Truncation
@param [String] text
the text to be truncated
@param [Hash] options
@option options [Symbol] :separator the character for splitting words @option options [Symbol] :trailing the character for ending sentence
@api public
# File lib/verse/truncation.rb, line 24 def initialize(text, options = {}) @text = text.dup.freeze @separator = options.fetch(:separator) { nil } @trailing = options.fetch(:trailing) { DEFAULT_TRAILING } end
truncate(text, truncate_at, options = {})
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Truncate a text at a given length
@see Verse::Truncation#truncate
@api public
# File lib/verse/truncation.rb, line 35 def self.truncate(text, truncate_at, options = {}) new(text, options).truncate(truncate_at, options) end
Public Instance Methods
truncate(truncate_at = DEFAULT_LENGTH, options = {})
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Truncate a text at a given length (defualts to 30)
@example
truncation = Verse::Truncation.new "The sovereignest thing on earth is parmacetti for an inward bruise." truncation.truncate # => "The sovereignest thing on ear…" truncate(20) # => "The sovereignest th…" truncate(20, separator: ' ' ) # => "The sovereignest…" truncate(40, trailing: '... (see more)' ) # => "The sovereignest thing on... (see more)"
@api public
# File lib/verse/truncation.rb, line 58 def truncate(truncate_at = DEFAULT_LENGTH, options = {}) if display_width(text) <= truncate_at.to_i || truncate_at.to_i.zero? return text.dup end trail = options.fetch(:trailing) { trailing } separation = options.fetch(:separator) { separator } width = display_width(text) sanitized_text = Sanitizer.sanitize(text) return text if width <= truncate_at length_without_trailing = truncate_at - display_width(trail) chars = to_chars(sanitized_text).to_a stop = chars[0, length_without_trailing].rindex(separation) slice_length = stop || length_without_trailing sliced_chars = chars[0, slice_length] original_chars = to_chars(text).to_a[0, 3 * slice_length] shorten(original_chars, sliced_chars, length_without_trailing).join + trail end
Protected Instance Methods
display_width(string)
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@api private
# File lib/verse/truncation.rb, line 113 def display_width(string) Unicode::DisplayWidth.of(Sanitizer.sanitize(string)) end
shorten(original_chars, chars, length_without_trailing)
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Perform actual shortening of the text
@return [String]
@api private
# File lib/verse/truncation.rb, line 87 def shorten(original_chars, chars, length_without_trailing) truncated = [] char_width = display_width(chars[0]) while length_without_trailing - char_width > 0 orig_char = original_chars.shift char = chars.shift break unless char while orig_char != char # consume ansi ansi = true truncated << orig_char orig_char = original_chars.shift end truncated << char char_width = display_width(char) length_without_trailing -= char_width end truncated << ["\e[0m"] if ansi truncated end
to_chars(text)
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@api private
# File lib/verse/truncation.rb, line 108 def to_chars(text) UnicodeUtils.each_grapheme(text) end