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Join/Split with arbitrary single-char dlimiter
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| def join(strings, delimiter) | |
| raise ArgumentError, "Invalid delimiter \"\\\"" if delimiter == "\\" | |
| strings.map do |s| | |
| s.gsub(/(\\|#{Regexp.escape(delimiter)})/, '\\\\\1') | |
| end.join(delimiter) | |
| end | |
| def split(string, delimiter) | |
| raise ArgumentError, "Invalid delimiter \"\\\"" if delimiter == "\\" | |
| strings = [] | |
| token = nil | |
| literal = false | |
| string.chars.each do |char| | |
| token ||= "" | |
| if literal | |
| token += char | |
| literal = false | |
| next | |
| end | |
| case char | |
| when "\\" | |
| literal = true | |
| when delimiter | |
| strings << token | |
| token = "" | |
| else | |
| token += char | |
| end | |
| end | |
| raise ArgumentError, "dangling escape" if literal | |
| strings << token unless token.nil? | |
| strings | |
| end |
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| require_relative './delim' | |
| # { delimiter => { string => array , ... }, ... } | |
| # for each string/array pair S/A: | |
| # - join(A) == S | |
| # - split(S) == A | |
| test_cases = { | |
| ":" => { | |
| "" => [], | |
| "foo" => ["foo"], | |
| ":" => ["", ""], | |
| "foo:bar" => ["foo", "bar"], | |
| 'foo\:bar' => ["foo:bar"], | |
| "foo:" => ["foo", ""], | |
| "foo:bar:" => ["foo", "bar", ""], | |
| ':foo\::\:bar:\:::' => ["", "foo:", ":bar", ":", "", ""], | |
| "\\\\:foo" => ["\\", "foo"], | |
| "\\\\\\:foo" => ["\\:foo"], | |
| "foo\\\\\\:\\\\bar" => ["foo\\:\\bar"] | |
| }, | |
| # Regex character | |
| "|" => { | |
| "" => [], | |
| "foo" => ["foo"], | |
| "|" => ["", ""], | |
| "foo|bar" => ["foo", "bar"], | |
| 'foo\|bar' => ["foo|bar"], | |
| "foo|" => ["foo", ""], | |
| "foo|bar|" => ["foo", "bar", ""], | |
| '|foo\||\|bar|\|||' => ["", "foo|", "|bar", "|", "", ""], | |
| "\\\\|foo" => ["\\", "foo"], | |
| "\\\\\\|foo" => ["\\|foo"], | |
| "foo\\\\\\|\\\\bar" => ["foo\\|\\bar"] | |
| }, | |
| " " => { | |
| "" => [], | |
| "foo" => ["foo"], | |
| " " => ["", "", "", ""], | |
| ' \ ' => ["", " ", ""], | |
| "this is a test" => ["this", "is", "a", "test"], | |
| %q[\ this\ is a\ test\ ] => [" this is", "a test "] | |
| }, | |
| "\n" => { | |
| "" => [], | |
| "\n" => ["", ""], | |
| "foo\nbar" => ["foo", "bar"], | |
| "foo\\\nbar" => ["foo\nbar"], | |
| "\nfoo\\\nbar\n" => ["", "foo\nbar", ""] | |
| } | |
| } | |
| test_cases.each do |delimiter, cases| | |
| cases.each do |str, arr| | |
| got = split(str, delimiter) | |
| if got != arr | |
| puts "split(#{str.inspect}, #{delimiter.inspect}): Got #{got.inspect}, want #{arr.inspect}" | |
| end | |
| end | |
| cases.each do |str, arr| | |
| got = join(arr, delimiter) | |
| if got != str | |
| puts "join(#{arr.inspect}, #{delimiter.inspect}): Got #{got.inspect}, want #{str.inspect}" | |
| end | |
| end | |
| end |
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