GitHub: fix GH-225
With Ruby 3.0.2 and csv 3.2.1, the file
```ruby
require "csv"
File.open("example.tsv", "w") { |f| f.puts("foo\t\tbar") }
CSV.read("example.tsv", col_sep: "\t", strip: true)
```
produces the error
```
lib/csv/parser.rb:935:in `parse_quotable_robust': TODO: Meaningful
message in line 1. (CSV::MalformedCSVError)
```
However, the CSV in this example is not malformed; instead, ambiguous
options were provided to the parser. It is not obvious (to me) whether
the string should be parsed as
- `["foo\t\tbar"]`,
- `["foo", "bar"]`,
- `["foo", "", "bar"]`, or
- `["foo", nil, "bar"]`.
This commit adds code that raises an exception when this situation is
encountered. Specifically, it checks if the column separator either ends
with or starts with the characters that would be stripped away.
This commit also adds unit tests and updates the documentation.
cc317dd42d
* Do not loop forever when skip_lines regexp matches zero length with anchors
* Remove needless white spaces
* Add missing eos check in skip_needless_lines
* Simplify test
3b15d4a3e8
This includes performance improvements and backward incompatibility
fixes.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67560 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This includes performance improvement especially writing. Writing is
about 2 times faster.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
