{"id":216,"date":"2016-06-14T18:16:15","date_gmt":"2016-06-14T18:16:15","guid":{"rendered":"http:\/\/arnoldvanhofwegen.com\/blog\/?p=216"},"modified":"2016-06-14T14:00:55","modified_gmt":"2016-06-14T14:00:55","slug":"new-red-release-in-sight-a-try-to-help","status":"publish","type":"post","link":"https:\/\/arnoldvanhofwegen.com\/blog\/new-red-release-in-sight-a-try-to-help\/","title":{"rendered":"New Red release in sight! A try to help!"},"content":{"rendered":"

A new release of the Red programming language is in the making. Many improvements are added as always.<\/p>\n

With this post I will try to push the cart a little on in the right direction.<\/p>\n

After I have made ENTAB and DETAB native functions, that wait on publishing to the mainline I wanted to write a blog article about how I did that. But shortly after I saw a similar task on the Trello Board<\/a>. The functions ENLINE and DELINE. Seems also pretty straightforward.<\/p>\n

What is enline\/deline? Let’s look at the help.<\/p>\n

ENLINE:
\nR3:
\nUSAGE:
\nENLINE series<\/code><\/p>\n

DESCRIPTION:
\nConverts string terminators to native OS format, e.g. LF to CRLF.
\nENLINE is a native value.<\/p>\n

ARGUMENTS:
\nseries — (modified) (any-string! block!)<\/p>\n

R2:
\nUSAGE:
\nENLINE series \/with end-of-line<\/p>\n

DESCRIPTION:
\nConverts standard string terminators to current OS format, e.g. LF to CRLF. (Modifies)
\nENLINE is a function value.<\/p>\n

ARGUMENTS:
\nseries -- (Type: any-string block)<\/p>\n

REFINEMENTS:
\n\/with -- Specifies alternate line termination.
\nend-of-line -- (Type: char string)
\n<\/code><\/p>\n

DELINE:
\nR3:
\nUSAGE:
\nDELINE string \/lines<\/p>\n

DESCRIPTION:
\nConverts string terminators to standard format, e.g. CRLF to LF.
\nDELINE is a native value.<\/p>\n

ARGUMENTS:
\nstring -- (modified) (any-string!)<\/p>\n

REFINEMENTS:
\n\/lines -- Return block of lines (works for LF, CR, CR-LF endings) (no modify)
\n<\/code><\/p>\n

R2:
\nUSAGE:
\nDELINE string \/lines<\/p>\n

DESCRIPTION:
\nConverts string terminators to standard format, e.g. CRLF to LF. (Modifies)
\nDELINE is a function value.<\/p>\n

ARGUMENTS:
\nstring -- (Type: any-string)<\/p>\n

REFINEMENTS:
\n\/lines -- Convert to block of lines (does not modify)
\n<\/code><\/p>\n

Does not appear to be too difficult?
\nEnline:<\/p>\n

    \n
  1. get the OS, so we know what line terminator we want in the end<\/li>\n
  2. replace\/all line terminators to OS-line terminator<\/li>\n<\/ol>\n

    Deline<\/p>\n

      \n
    1. get the OS line terminator<\/li>\n
    2. change all OS line terminators to standard line terminator.<\/li>\n<\/ol>\n

      Next step.<\/p>\n

      Let’s peek at how it is done in R3 source?<\/p>\n

      The natives are found here<\/a>.
      \nBut these are more like functions to separate the handling of ASCII and unicode strings, calling other functions in turn.
      \nThe functions that we are really looking for are       here<\/a>.<\/p>\n

      When we look closely we see that the UNI and BYTE functions are practically the same except for the type of characters used.
      \nBecause Red handles these differences internally within the string manipulating functions we will not need two different versions.<\/p>\n

      Functions in string.reds that are candidate functions we can use
      \n
      \nappend-char
      \noverwrite-char
      \ninsert-char
      \nremove-char
      \npoke-char
      \nfind (an action in string.reds)
      \n<\/code><\/p>\n

      There is also some information in the Rebol cookbook<\/a>.<\/p>\n

      Here we learn the line terminators of OS for free<\/p>\n