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Feature #7309

closed

HEREDOC end of line or similar

Added by eTM (Juergen Mangler) about 12 years ago. Updated almost 11 years ago.

Status:
Rejected
Assignee:
matz (Yukihiro Matsumoto)
Target version:
2.6
[ruby-core:49093]

Description

example: writing a dsl that expresses some facts

  increase "coding" experience one level until 'next summer'

This can right now be done in different ways

  • make the whole thing a string and parse it
  • increase.experience('coding').one_level.until('next summer')
  • increase "'coding' experience one level until 'next summer'"

Another nice alternative would be a heredoc type that operates to the end of the line (i couldn't find existing implementations for perl and ruby)

  Example1: increase <<* "coding" experience one level until "next summer"
  Example2: increase <<< "coding" experience one level until "next summer"

  def increase(str) # the rest of the line is passed as a string

Although it looks not very elegant for a DSL it would to the job. of course something more unobtrusive would be better, but i don't know how difficult this would be for the parser. e.g.:

  def increase(~str); end

  • When a method has ~ attribute it could automatically read the rest of the line as string when invoked (or when used with method call brackets to the closing bracket). Invoke like:

    increase "coding" experience one level until "next summer"

OR

  increase("coding" experience one level until "next summer")
  • ~ attributes always as last attribute: def increase(a,b,~str); end
    ** Invoke like: increase "val1", "val2", the rest is a string
    ** In this case the rest str should have a leading " "

Summary: First possibility (heredoc like) would allow for neat(er) looking dsl's. The second possibility (~attributes, not sure if this is doable) would allow for a VERY neat looking DSL's. Both for sure also would increase the interest in string parsing ;-)

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