Class: Vita::NoteScanner

Inherits:
Object
  • Object
show all
Defined in:
lib/vita/note_scanner.rb

Defined Under Namespace

Classes: Match

Constant Summary collapse

CONTEXT_BOUNDARY = 
/(?<=\A|[.!?])|\n\n|\z/
NOT_WHITESPACE = 
/\S/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ NoteScanner

Returns a new instance of NoteScanner.



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# File 'lib/vita/note_scanner.rb', line 10

def initialize(string)
  @string = string
end

Instance Attribute Details

#string ⇒ Object (readonly)

Returns the value of attribute string.



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# File 'lib/vita/note_scanner.rb', line 8

def string
  @string
end

Instance Method Details

#flatten_newlines(string) ⇒ Object 



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# File 'lib/vita/note_scanner.rb', line 38

def flatten_newlines(string)
  string.tr("\n", " ")
end

#scan(regexp) ⇒ Object 



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# File 'lib/vita/note_scanner.rb', line 14

def scan(regexp)
  matches = string.to_enum(:scan, regexp).map { Regexp.last_match }

  matches.map do |match|
    link_text = match[0]
    match_start, match_end = match.offset(0)

    prev_context_boundary = string.rindex(CONTEXT_BOUNDARY, match_start)
    next_context_boundary = string.index(CONTEXT_BOUNDARY, match_end)

    context_start = string.index(NOT_WHITESPACE, prev_context_boundary)
    context_end = string.rindex(NOT_WHITESPACE, next_context_boundary)

    context_around_match = string[context_start..context_end]

    Match.new(
      position: match_start,
      text: link_text,
      context: flatten_newlines(context_around_match),
      context_position: match_start - context_start
    )
  end
end