外部文件替換列表

Question

我需要傳遞一個字符串對外部文件，該文件包含要在每次出現時執行的替換列表。

的替代文件看起來像這樣（我願意在結構上的建議，它可以是一個CSV，YAML一個，等...）

"ipsum" "foobar" 
"elit" "" 
"sit amet" "2312" 

我的Ruby代碼應該是這樣實現的這樣的：

mystring = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam quis elit augue. Nulla tempus magna nec ligula dapibus malesuada. Fusce at orci augue, sit amet suscipit sem. Suspendisse potenti." 

newstring = mystring.somemagichappenshere 

而且newstring值應爲"Lorem foobar dolor 2312, consectetur adipiscing . Aliquam quis augue. Nulla tempus magna nec ligula dapibus malesuada. Fusce at orci augue, 2312 suscipit sem. Suspendisse potenti."

我應該如何實現呢？

Answer 1

使用CSV替換值：

require 'csv' 
str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam quis elit augue. Nulla tempus magna nec ligula dapibus malesuada. Fusce at orci augue, sit amet suscipit sem. Suspendisse potenti." 

replacements = "ipsum,foobar 
elit, 
sit amet,2312" 
#construct a hash from the csv: 
transform_table = Hash[CSV.parse(replacements)] 
#Take the keys from the hash and use them for a regular expression: 
re = Regexp.union(transform_table.keys) 
#Do all substituions in one go: 
p str.gsub(re, transform_table) 

Answer 2

這是很簡單的

1. 讀取文件
2. 迭代文件中的每一行，每個條目使用mystring.gsub!(find, replace)用替換