Strikethrough syntax
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pieterhpieterh wrote on 18 Feb 2010 12:14

New strikethrough syntax

This is a design sketch for a new strikethrough syntax that fixes an old design error in the syntax, where double hyphen is used both for strikethrough and for em-dash.

  1. We add a new strikethrough command '==' that works like the current strikethrough but does not conflict with em-dashes.
  2. We change the way the old strikethrough works to make it safe with em-dashes and yet remain backwards compatible with most existing strikethrough.
  3. We deprecate the old strikethrough and discourage its use.

To make the old strikethrough safe, we restrict it to a specific case:
This is a design sketch for a new strikethrough syntax that fixes an old design error in the syntax, where double hyphen is used both for strikethrough and for em-dash.

  1. We add a new strikethrough command '==' that works like the current strikethrough but does not conflict with em-dashes.
  2. We change the way the old strikethrough works to make it safe with em-dashes and yet remain backwards compatible with most existing strikethrough.
  3. We deprecate the old strikethrough and discourage its use.

To make the old strikethrough safe, we restrict it to a specific case:

  • The opening -- must have a space, start of the line, or other non-word character before it, and must be immediately followed by a word character.
  • The closing -- must have a space, end of the line, or other non-word character after it, and must immediately follow a word character.

Examples:

This syntax Produces this text
This--is a--string This—is a—string
This--is a string-- This—is a string—
This -- is a -- string This — is a — string
This --is a-- string This is a string
This --is a string-- This is a string

Thus existing strikethrough of whole words (the most common case) will still work, while em-dashes that use either the space or no-space style will display correctly.


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This will generate another "error" By michal-frackowiak 1 Comments 09 Mar 2010 13:01
I don't like en-dash By Brunhilda 6 Comments 18 Feb 2010 22:42

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