Class: Decode::Syntax::Rewriter

Inherits:
Object
  • Object
show all
Defined in:
lib/decode/syntax/rewriter.rb

Overview

Provides text rewriting functionality with match-based substitutions.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text) ⇒ Rewriter

Initialize a new rewriter.



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# File 'lib/decode/syntax/rewriter.rb', line 12

def initialize(text)
  @text = text
  @matches = []
end

Instance Attribute Details

#matches ⇒ Object (readonly)

Returns the value of attribute matches.



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# File 'lib/decode/syntax/rewriter.rb', line 21

def matches
  @matches
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/decode/syntax/rewriter.rb', line 18

def text
  @text
end

#The matches to apply.(matchestoapply.) ⇒ Object (readonly) 



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# File 'lib/decode/syntax/rewriter.rb', line 21

attr :matches

#The text to rewrite.(texttorewrite.) ⇒ Object (readonly) 



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# File 'lib/decode/syntax/rewriter.rb', line 18

attr :text

Instance Method Details

#<<(match) ⇒ Object

Add a match to the rewriter.



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# File 'lib/decode/syntax/rewriter.rb', line 25

def << match
  @matches << match
  return self
end

#apply(output = []) ⇒ Object

Apply all matches to generate the rewritten output.



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# File 'lib/decode/syntax/rewriter.rb', line 37

def apply(output = [])
  offset = 0
  
  @matches.sort.each do |match|
    if match.offset > offset
      output << text_for(offset...match.offset)
      
      offset = match.offset
    elsif match.offset < offset
      # Match intersects last output buffer.
      next
    end
    
    offset += match.apply(output, self)
  end
  
  if offset < @text.size
    output << text_for(offset...@text.size)
  end
  
  return output
end

#link_to(definition, text) ⇒ Object

Generate a link to a definition.



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# File 'lib/decode/syntax/rewriter.rb', line 63

def link_to(definition, text)
  "[#{text}]"
end

#text_for(range) ⇒ Object

Returns a chunk of raw text with no formatting.



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# File 'lib/decode/syntax/rewriter.rb', line 31

def text_for(range)
  @text[range] || ""
end