我正在使用 Nokogiri 代码在 HTML 节点之间提取文本,当我读入文件列表时出现这些错误。我没有使用简单的嵌入式 HTML 得到错误。我想消除或抑制警告但不知道如何。警告出现在每个 block 的末尾:
extract.rb:18: warning: already initialized constant EXTRACT_RANGES
extract.rb:25: warning: already initialized constant DELIMITER_TAGS
这是我的代码:
#!/usr/bin/env ruby -wKU
require 'rubygems'
require 'nokogiri'
require 'fileutils'
source = File.open('/documents.txt')
source.readlines.each do |line|
line.strip!
if File.exists? line
file = File.open(line)
doc = Nokogiri::HTML(File.read(line))
# suggested by dan healy, stackoverflow
# Specify the range between delimiter tags that you want to extract
# triple dot is used to exclude the end point
# 1...2 means 1 and not 2
EXTRACT_RANGES = [
1...2
]
# Tags which count as delimiters, not to be extracted
DELIMITER_TAGS = [
"h1",
"h2",
"h3"
]
extracted_text = []
i = 0
# Change /"html"/"body" to the correct path of the tag which contains this list
(doc/"html"/"body").children.each do |el|
if (DELIMITER_TAGS.include? el.name)
i += 1
else
extract = false
EXTRACT_RANGES.each do |cur_range|
if (cur_range.include? i)
extract = true
break
end
end
if extract
s = el.inner_text.strip
unless s.empty?
extracted_text << el.inner_text.strip
end
end
end
end
print("\n")
puts line
print(",\n")
# Print out extracted text (each element's inner text is separated by newlines)
puts extracted_text.join("\n\n")
end
end
最佳答案
如果代码缩进得当,就会更容易注意到常量定义是在一个循环中完成的。
比较
source.readlines.each do |line|
# code
if true
# Wrongly indented code
# More
# Wrongly
# Indented
# Code
EXTRACT_RANGES = [
1...2
]
# Several more pages of code
end
end
与
source.readlines.each do |line|
# code
if true
# Correctly indented code
# What is a constant doing being defined
# this far indented?
# Oh no - it's in a loop!
EXTRACT_RANGES = [
1...2
]
# Several more pages of code
end
end
关于ruby - 已经初始化的常量警告,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7849410/