rfc:flexible_heredoc_nowdoc_syntaxes

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rfc:flexible_heredoc_nowdoc_syntaxes [2017/09/27 10:43]
tpunt
rfc:flexible_heredoc_nowdoc_syntaxes [2018/04/13 19:59]
nikic Implementation landed
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   * Date: 2017-09-16   * Date: 2017-09-16
   * Author: Thomas Punt, tpunt@php.net   * Author: Thomas Punt, tpunt@php.net
-  * Status: Draft+  * Status: Implemented (in PHP 7.3)
   * First Published at: https://wiki.php.net/rfc/flexible_heredoc_nowdoc_syntaxes   * First Published at: https://wiki.php.net/rfc/flexible_heredoc_nowdoc_syntaxes
  
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 { {
  echo <<<END  echo <<<END
-  a+   a
  END;  END;
 } }
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 These whitespace constraints have been included because mixing tabs and spaces for indentation is harmful to legibility. These whitespace constraints have been included because mixing tabs and spaces for indentation is harmful to legibility.
 +
 +Ultimately, the purpose of stripping leading whitespace is to allow for the body of the heredoc and nowdoc to be indented to the same level as the surrounding code, without causing unnecessary (and perhaps undesirable) whitespace to prepend each line of the body text. Without this, developers may choose to de-indent the body text to prevent leading whitespace, which leads us back to the current situation of having indentation levels of code ruined by these syntaxes.
  
 ==== Closing Marker New Line ==== ==== Closing Marker New Line ====
  
-Currently, in order to terminate a heredoc or nowdoc, a new line **must** be used after the closing marker (with the option +Currently, in order to terminate a heredoc or nowdoc, a new line **must** be used after the closing markerRemoving this requirement will change code from:
-Removing the closing marker requirement will change code from:+
 <code php> <code php>
 stringManipulator(<<<END stringManipulator(<<<END
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 </code> </code>
  
-This change was actually brought up in a previous RFC ([[rfc:heredoc-scanner-loosening|PHP RFC: Loosening heredoc/nowdoc scanner]]). One of the big gotchas that it mentioned, however, was that if the ending marker was found at the start of a line, then regardless of whether it was apart of another word, it would still be considered as the ending marker. For example, the following would not work:+This change was actually brought up in a previous RFC ([[rfc:heredoc-scanner-loosening|PHP RFC: Loosening heredoc/nowdoc scanner]]). One of the big gotchas that it mentioned, however, was that if the ending marker was found at the start of a line, then regardless of whether it was a part of another word, it would still be considered as the ending marker. For example, the following would not work (due to ''ENDING'' containing ''END''):
 <code php> <code php>
 $values = [<<<END $values = [<<<END
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   * the colliding marker begins at the start of a line in the text   * the colliding marker begins at the start of a line in the text
-  * the colliding marker can be seen as standalone+  * the colliding marker can be seen as standalone, valid symbol name
  
-The changes proposed in this RFC therefore comes down to whether you believe developers are responsible enough to choose non-colliding markers. I firmly believe that since we give developers the power to choose their own markers, then they should be responsible enough to choose markers that do not collide with the inner multiline text+The changes proposed by this RFC therefore come down to whether you believe developers are responsible enough to choose non-colliding markers. I firmly believe that since we give developers the power to choose their own markers, then they should be responsible enough to choose markers that do not collide with the inner multiline text.
- +
-Therefore, I believe the tradeoff of making the heredoc and nowdoc syntaxes more flexible in return for requiring developers to actually choose good marker names is a tradeoff worth making.+
  
 So to quickly reiterate, the changes proposed by this RFC will enable for code such as the following: So to quickly reiterate, the changes proposed by this RFC will enable for code such as the following:
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 ===== Proposed Voting Choices ===== ===== Proposed Voting Choices =====
  
-There will be two votes, both requiring a 2/3 majority. The first will be regarding whether the closing marker should be able to be indented. The second will be whether the closing marker should remove the new line requirement. These votes are orthogonal to one-another (it doesn't matter if one fails).+There will be two votes, both requiring a 2/3 majority. The first will be regarding whether the closing marker can be indented. The second will be whether the closing marker should remove the new line requirement. These votes are orthogonal to one-another (if one fails and the other passes, then the other still passes). 
 + 
 +Voting starts on 2017.11.01 and ends on 2017.11.15. 
 + 
 +<doodle title="Allow for the closing marker to be indented and for the leading whitespace to be stripped?" auth="tpunt" voteType="single" closed="true"> 
 +   * Yes 
 +   * No 
 +</doodle> 
 +'''' 
 +<doodle title="Remove the trailing new line requirement from the closing marker?" auth="tpunt" voteType="single" closed="true"> 
 +   * Yes 
 +   * No 
 +</doodle>
  
 ===== Patches and Tests ===== ===== Patches and Tests =====
rfc/flexible_heredoc_nowdoc_syntaxes.txt · Last modified: 2018/04/13 19:59 by nikic