Ruby remove interpolation from string
I want to remove string interpolation for eval.
I have a lot of places with such code, so only one option is modifying the condition to unescape code.
I found a regexp that works well
"#{user.name}"[/[^#{}]+/]
as result, I have "user.name"
but such code removing curly braces in blocks as well
"#{[1,2,3].map { |el| el }.join(',')}"[/[^#{}]+/]
returns
"[1,2,3].map "
the expected result is:
"[1,2,3].map { |el| el }.join(',')"
Any ideas how to solve it?
ruby regex
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
add a comment |
I want to remove string interpolation for eval.
I have a lot of places with such code, so only one option is modifying the condition to unescape code.
I found a regexp that works well
"#{user.name}"[/[^#{}]+/]
as result, I have "user.name"
but such code removing curly braces in blocks as well
"#{[1,2,3].map { |el| el }.join(',')}"[/[^#{}]+/]
returns
"[1,2,3].map "
the expected result is:
"[1,2,3].map { |el| el }.join(',')"
Any ideas how to solve it?
ruby regex
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
Tryyour_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.
– Wiktor Stribiżew
Nov 20 '18 at 13:18
2
If the goal of this is to makeevalsafe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.
– Max
Nov 20 '18 at 14:26
add a comment |
I want to remove string interpolation for eval.
I have a lot of places with such code, so only one option is modifying the condition to unescape code.
I found a regexp that works well
"#{user.name}"[/[^#{}]+/]
as result, I have "user.name"
but such code removing curly braces in blocks as well
"#{[1,2,3].map { |el| el }.join(',')}"[/[^#{}]+/]
returns
"[1,2,3].map "
the expected result is:
"[1,2,3].map { |el| el }.join(',')"
Any ideas how to solve it?
ruby regex
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
I want to remove string interpolation for eval.
I have a lot of places with such code, so only one option is modifying the condition to unescape code.
I found a regexp that works well
"#{user.name}"[/[^#{}]+/]
as result, I have "user.name"
but such code removing curly braces in blocks as well
"#{[1,2,3].map { |el| el }.join(',')}"[/[^#{}]+/]
returns
"[1,2,3].map "
the expected result is:
"[1,2,3].map { |el| el }.join(',')"
Any ideas how to solve it?
ruby regex
ruby regex
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
asked Nov 20 '18 at 12:36
Ivan VerevkinIvan Verevkin
274
274
Tryyour_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.
– Wiktor Stribiżew
Nov 20 '18 at 13:18
2
If the goal of this is to makeevalsafe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.
– Max
Nov 20 '18 at 14:26
add a comment |
Tryyour_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.
– Wiktor Stribiżew
Nov 20 '18 at 13:18
2
If the goal of this is to makeevalsafe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.
– Max
Nov 20 '18 at 14:26
Try
your_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.– Wiktor Stribiżew
Nov 20 '18 at 13:18
Try
your_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.– Wiktor Stribiżew
Nov 20 '18 at 13:18
2
2
If the goal of this is to make
eval safe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.– Max
Nov 20 '18 at 14:26
If the goal of this is to make
eval safe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.– Max
Nov 20 '18 at 14:26
add a comment |
1 Answer
1
active
oldest
votes
You can use gsub and named regex in this case
> reg = Regexp.new('\#{(?<content>.+)}')
=> /#{(?<content>.+)}/
> str1.gsub(reg) { |match| $~[:content] }
=> "user.name"
> str2.gsub(reg) { |match| $~[:content] }
=> "[1,2,3].map { |el| el }.join(',')"
Your example didn't work well because [^smth] matches against any single character in the list, not the whole sentence.
BTW I'd like to warn you that regexp might fit for simple adjustments, but it will always have some edge cases. I'm not sure how the example above will behave on interpolation inside interpolation for example.
It's better to use proper lexer & parser for more complex cases.
Also, be very... very careful doing eval
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use gsub and named regex in this case
> reg = Regexp.new('\#{(?<content>.+)}')
=> /#{(?<content>.+)}/
> str1.gsub(reg) { |match| $~[:content] }
=> "user.name"
> str2.gsub(reg) { |match| $~[:content] }
=> "[1,2,3].map { |el| el }.join(',')"
Your example didn't work well because [^smth] matches against any single character in the list, not the whole sentence.
BTW I'd like to warn you that regexp might fit for simple adjustments, but it will always have some edge cases. I'm not sure how the example above will behave on interpolation inside interpolation for example.
It's better to use proper lexer & parser for more complex cases.
Also, be very... very careful doing eval
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
add a comment |
You can use gsub and named regex in this case
> reg = Regexp.new('\#{(?<content>.+)}')
=> /#{(?<content>.+)}/
> str1.gsub(reg) { |match| $~[:content] }
=> "user.name"
> str2.gsub(reg) { |match| $~[:content] }
=> "[1,2,3].map { |el| el }.join(',')"
Your example didn't work well because [^smth] matches against any single character in the list, not the whole sentence.
BTW I'd like to warn you that regexp might fit for simple adjustments, but it will always have some edge cases. I'm not sure how the example above will behave on interpolation inside interpolation for example.
It's better to use proper lexer & parser for more complex cases.
Also, be very... very careful doing eval
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
add a comment |
You can use gsub and named regex in this case
> reg = Regexp.new('\#{(?<content>.+)}')
=> /#{(?<content>.+)}/
> str1.gsub(reg) { |match| $~[:content] }
=> "user.name"
> str2.gsub(reg) { |match| $~[:content] }
=> "[1,2,3].map { |el| el }.join(',')"
Your example didn't work well because [^smth] matches against any single character in the list, not the whole sentence.
BTW I'd like to warn you that regexp might fit for simple adjustments, but it will always have some edge cases. I'm not sure how the example above will behave on interpolation inside interpolation for example.
It's better to use proper lexer & parser for more complex cases.
Also, be very... very careful doing eval
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
You can use gsub and named regex in this case
> reg = Regexp.new('\#{(?<content>.+)}')
=> /#{(?<content>.+)}/
> str1.gsub(reg) { |match| $~[:content] }
=> "user.name"
> str2.gsub(reg) { |match| $~[:content] }
=> "[1,2,3].map { |el| el }.join(',')"
Your example didn't work well because [^smth] matches against any single character in the list, not the whole sentence.
BTW I'd like to warn you that regexp might fit for simple adjustments, but it will always have some edge cases. I'm not sure how the example above will behave on interpolation inside interpolation for example.
It's better to use proper lexer & parser for more complex cases.
Also, be very... very careful doing eval
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
edited Nov 20 '18 at 14:04
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
answered Nov 20 '18 at 13:58
Alexey SuslyakovAlexey Suslyakov
5421614
5421614
add a comment |
add a comment |
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Try
your_str[/#({(?:[^{}]++|g<1>)*})/, 1].gsub(/[{}]/, ""), see demo.– Wiktor Stribiżew
Nov 20 '18 at 13:18
2
If the goal of this is to make
evalsafe, don't bother. You would basically need to implement a Ruby static analyzer to truly do that.– Max
Nov 20 '18 at 14:26