Ruby 截断字符串的部分以限制整个字符串'；红宝石中的s长度
假设要生成如下所示的动态页面标题： “这都是一个梦想，我以前读过臭名昭著的B.I.G.的《多汁》中的《WordUp杂志》 例如，艺术家“SONG_NAME”中的“歌词” 但是，您的标题总共只能包含69个字符，此模板有时会生成更长的标题 解决此问题的一种策略是将整个字符串截断为69个字符。但是，更好的方法是先截断字符串中不太重要的部分。即，您的算法可能如下所示：Ruby 截断字符串的部分以限制整个字符串'；红宝石中的s长度,ruby,string,Ruby,String,假设要生成如下所示的动态页面标题： “这都是一个梦想，我以前读过臭名昭著的B.I.G.的《多汁》中的《WordUp杂志》 例如，艺术家“SONG_NAME”中的“歌词” 但是，您的标题总共只能包含69个字符，此模板有时会生成更长的标题 解决此问题的一种策略是将整个字符串截断为69个字符。但是，更好的方法是先截断字符串中不太重要的部分。即，您的算法可能如下所示： 截断歌词，直到整个字符串都是我有一个类似的问题，就是截断标题，把它们放到tweet中。最后我把所有的东西都放在一个数组中并加入它。代码是
message = [lyrics, " from ", song_name, " by ", artist]
[0, 2, 4].each do |index|
length = message.join.length
message[index] = message[index][0...(69-length)]
end
message = message.join
您可能还希望在截断时附加省略号，以便人们知道它已被截断。这是一个相当完整的实现
#!/usr/bin/ruby
MIN_WORD_SIZE = 10
MAX_STRING_SIZE = 55 # 69 - 14 characters for punctuation spacing and conjunctions
def smart_trunc_words(lyrics, artist, title)
words = [lyrics, artist, title]
words.each_index do |idx|
total_length = words.to_s.length
if ( words[idx].length > MIN_WORD_SIZE and total_length > MAX_STRING_SIZE )
other_words = total_length - words[idx].length
max_word_size = [MAX_STRING_SIZE - other_words, MIN_WORD_SIZE].max
words[idx] = truncate_word words[idx], max_word_size
end
end
words
end
def truncate_word(word, sub_size)
# Enhance by adding ellipses here or break on a word boundary
word[0, sub_size]
end
def smart_trunc(lyrics, artist, title)
lyrics, artist, title = smart_trunc_words lyrics, artist, title
'"%s" from "%s" by %s' % [lyrics, title, artist]
end
test_data = [
[ "It was all a dream, I used to read word up magazine", "The Notorious B.I.G", "Juicy"],
[ "Ground Control to Major Tom, your circuits dead there's something wrong", "David Bowie", "Space Oddity"],
[ "Back Home they'll be thinking about us", "The England world cup squad (1970)" , "Back Home"],
[ "I'm the new cancer", "Panic at the disco", "Theres A Good Reason These Tables Are Numbered Honey, You Just Havent Thought Of It Yet"],
[ "Short lyrics", "short band", "short song"],
[ "VeryLongLyrics VeryLongLyrics VeryLongLyrics VeryLongLyrics VeryLongLyrics",
"VeryLongBandName VeryLongBandName VeryLongBandName VeryLongBandName VeryLongBandName",
"VeryLongTitle VeryLongTitle VeryLongTitle VeryLongTitle VeryLongTitle"]
]
test_data.each do |td|
lyrics = td[0]
artist = td[1]
title = td[2]
puts 'Original string : "%s" from "%s" by %s' % [lyrics, title, artist]
puts "New string : #{smart_trunc lyrics, artist, title}"
end