Ruby - Feature #12694: Want a String method to remove heading substr</h1> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-08-23T11:39:52Z</p> <ul></ul><p>IIRC, there were proposals of <code>lstrip</code> and <code>rstrip</code> enhancement.<br> I'd expect them to accept char class(es), than a sub-string.</p> <p>Note that <code>rb_str_index_m</code> accepts a <code>Regexp</code> too.<br> Calling <code>str_strlen</code> on it will segfault.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-08-23T12:01:43Z</p> <ul></ul><p>Thanks, I found an issue which is 3 years old <a href="https://bugs.ruby-lang.org/issues/6842" class="external">https://bugs.ruby-lang.org/issues/6842</a></p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-08-24T00:24:58Z</p> <ul><li><strong>Is duplicate of</strong> <i><a class="issue tracker-2 status-2 priority-4 priority-default" href="https://bugs.ruby-lang.org/issues/6842">Feature #6842</a>: Add Optional Arguments to String#strip</i> added</li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-08-24T05:34:49Z</p> <ul><li><strong>Status</strong> changed from <i>Open</i> to <i>Rejected</i></li></ul><p>I will continue this issue on <a href="https://bugs.ruby-lang.org/issues/6842" class="external">https://bugs.ruby-lang.org/issues/6842</a>, let me close.</p> <p>=> <a href="https://bugs.ruby-lang.org/issues/6842" class="external">https://bugs.ruby-lang.org/issues/6842</a> is too broad. Let us reopen this ticket, and talk about a way removing heading substr at this thread.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:39:57Z</p> <ul><li><strong>Status</strong> changed from <i>Rejected</i> to <i>Open</i></li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:42:02Z</p> <ul></ul><p>This method removes prefix string, so I propose <code>remove_prefix</code> or <code>deprefix</code> (means remove prefix).</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:42:34Z</p> <ul></ul><p>We discussed about this ticket on ruby development meeting.</p> <p>Python lstrip <a href="http://www.tutorialspoint.com/python/string_lstrip.htm" class="external">http://www.tutorialspoint.com/python/string_lstrip.htm</a> takes character classes as an argument, so providing a substring as an argument will introduce confusion.</p> <p>We need to think of new naming. What about <code>String#lchomp</code> or <code>String#remove_prefix</code> or <code>String#head_chop</code> for example?</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:44:46Z</p> <ul></ul><p>It seems python, perl does not have similar methods (which removes heading substr)</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:48:20Z</p> <ul><li><strong>Description</strong> updated (<a title="View differences" href="https://bugs.ruby-lang.org/journals/60392/diff?detail_id=42375">diff</a>)</li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:50:29Z</p> <ul><li><strong>Description</strong> updated (<a title="View differences" href="https://bugs.ruby-lang.org/journals/60393/diff?detail_id=42376">diff</a>)</li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T06:58:20Z</p> <ul><li><strong>Description</strong> updated (<a title="View differences" href="https://bugs.ruby-lang.org/journals/60395/diff?detail_id=42378">diff</a>)</li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-07T07:51:06Z</p> <ul></ul><p>PHP has ltrim and rtrim (which is an alias of chop), but they are for removing a character list, not removing a substring <a href="http://php.net/manual/en/function.ltrim.php" class="external">http://php.net/manual/en/function.ltrim.php</a></p> <pre><code>ltrim('foaofe', 'foa'); #=> 'e' </code></pre> <p>Elixir has trim_leading, but it looks different with what we want to do <a href="http://elixir-lang.org/docs/stable/elixir/String.html#trim_leading/2" class="external">http://elixir-lang.org/docs/stable/elixir/String.html#trim_leading/2</a></p> <pre><code>iex> String.trim_leading("__ abc _", "_") " abc _" iex> String.trim_leading("1 abc", "11") "1 abc" </code></pre> <p>Golang has the same one with what we want to do <a href="https://golang.org/pkg/strings/#TrimPrefix" class="external">https://golang.org/pkg/strings/#TrimPrefix</a> and TrimSuffix</p> <pre><code> var s = "Goodbye,, world!" s = strings.TrimPrefix(s, "Goodbye,") #=> , world </code></pre> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2016-09-13T07:10:03Z</p> <ul></ul><p>Naotoshi Seo wrote:</p> <blockquote> <p>Python lstrip <a href="http://www.tutorialspoint.com/python/string_lstrip.htm" class="external">http://www.tutorialspoint.com/python/string_lstrip.htm</a> takes character classes as an argument, so providing a substring as an argument will introduce confusion.</p> </blockquote> <p>"character classes" may be confusing. "a list of characters" might be more precise. There are many classes of characters that can't be expressed easily with a list. In particular because Python lstrip doesn't accept hyphens to group characters.</p> <p>One way to deal with this would be to allow a Regexp that selects a single character, and apply this repeatedly. But we don't have any such concept yet.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-05-25T12:24:00Z</p> <ul></ul><p>I've created a PR <a href="https://github.com/ruby/ruby/pull/1632" class="external">https://github.com/ruby/ruby/pull/1632</a> with a name String#<strong>remove_prefix</strong>.<br> I will merge if the name is acceptable.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-05-31T12:37:38Z</p> <ul></ul><blockquote> <p><code>str.sub(/^#{Regexp.escape(substr)}/, '') #=> 'def'</code></p> </blockquote> <p>I think <code>^</code> should be <code>\A</code> in description of this ticket. (and maybe in handle_tag_name_mixin.rb of fluentd too)</p> <p>Which is expected?: first prefix of string only or prefix of each line</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-05-31T12:41:05Z</p> <ul></ul><p>\A is correct. I updated the description, thanks.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-05-31T12:46:12Z</p> <ul><li><strong>Description</strong> updated (<a title="View differences" href="https://bugs.ruby-lang.org/journals/65197/diff?detail_id=45276">diff</a>)</li></ul> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-16T06:11:30Z</p> <ul></ul><p>I'd pick the name <code>delete_prefix</code>.</p> <p>Matz.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-16T06:26:10Z</p> <ul></ul><p>Thanks! I've changed the name to delete_prefix. <a href="https://github.com/ruby/ruby/pull/1632" class="external">https://github.com/ruby/ruby/pull/1632</a></p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-16T14:14:33Z</p> <ul></ul><p>sonots (Naotoshi Seo) wrote:</p> <blockquote> <p>Thanks! I've changed the name to delete_prefix. <a href="https://github.com/ruby/ruby/pull/1632" class="external">https://github.com/ruby/ruby/pull/1632</a></p> </blockquote> <p>do we need a delete_suffix too or is that done via another method?</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-16T14:23:38Z</p> <ul></ul><p>We have String#chomp to delete suffix, but it would be nice to have the method for symmetry.<br> I will create another thread to discuss about it.</p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-16T14:31:04Z</p> <ul></ul><p>I made a ticket for String#delete_suffix <a href="https://bugs.ruby-lang.org/issues/13665" class="external">https://bugs.ruby-lang.org/issues/13665</a></p> </article> <article> <h1>Ruby - Feature #12694: Want a String method to remove heading substr</h1> <p>2017-06-21T07:43:31Z</p> <ul><li><strong>Status</strong> changed from <i>Open</i> to <i>Closed</i></li></ul><p>Applied in changeset trunk|r59132.</p> <hr> <p>string.c: add String#delete_prefix and String#delete_prefix!<br> to remove leading substr [Feature <a class="issue tracker-2 status-5 priority-4 priority-default closed" title="Feature: Want a String method to remove heading substr (Closed)" href="https://bugs.ruby-lang.org/issues/12694">#12694</a>] [fix GH-1632]</p> <ul> <li> <p>string.c (rb_str_delete_prefix_bang): add a new method<br> to remove prefix destuctively.</p> </li> <li> <p>string.c (rb_str_delete_prefix): add a new method<br> to remove prefix non-destuctively.</p> </li> <li> <p>test/ruby/test_string.rb: add tests.</p> </li> </ul> </article> </main></body></html>