Errors from removed tags
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Anatol Broder
Mar 8, 2015, 11:21:37 PM3/8/15
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I want to make a basic validation of HTML files using parsing errors
from Nokogiri. Some tags are always invalid, so I remove them. But the
errors still here after removing the corresponding invalid tag. This
code is where I’m stuck.
```ruby
require "nokogiri"
doc = Nokogiri::HTML "<svg xmlns=http://www.w3.org/2000/svg />"
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body><svg xmlns="http://www.w3.org/2000/svg"></svg></body></html>
# Errors: [#<Nokogiri::XML::SyntaxError: Tag svg invalid>]
doc.xpath("//svg").each(&:unlink)
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body></body></html>
# Errors: [#<Nokogiri::XML::SyntaxError: Tag svg invalid>]
```
The best solution I can figure out is to reparse the modified document.
```ruby
require "nokogiri"
doc = Nokogiri::HTML "<svg xmlns=http://www.w3.org/2000/svg />"
doc.xpath("//svg").each(&:unlink)
doc = Nokogiri::HTML doc.to_html
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body></body></html>
# Errors: []
```
How would you get errors from the modified document? What is the most
efficient way to do it?
from Nokogiri. Some tags are always invalid, so I remove them. But the
errors still here after removing the corresponding invalid tag. This
code is where I’m stuck.
```ruby
require "nokogiri"
doc = Nokogiri::HTML "<svg xmlns=http://www.w3.org/2000/svg />"
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body><svg xmlns="http://www.w3.org/2000/svg"></svg></body></html>
# Errors: [#<Nokogiri::XML::SyntaxError: Tag svg invalid>]
doc.xpath("//svg").each(&:unlink)
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body></body></html>
# Errors: [#<Nokogiri::XML::SyntaxError: Tag svg invalid>]
```
The best solution I can figure out is to reparse the modified document.
```ruby
require "nokogiri"
doc = Nokogiri::HTML "<svg xmlns=http://www.w3.org/2000/svg />"
doc.xpath("//svg").each(&:unlink)
doc = Nokogiri::HTML doc.to_html
puts "Document: #{doc}", "Errors: #{doc.errors}"
# Document: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# <html><body></body></html>
# Errors: []
```
How would you get errors from the modified document? What is the most
efficient way to do it?
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