Class: Ramekin::Scanner

Inherits:
Object
  • Object
show all
Defined in:
lib/ramekin/scanner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/ramekin/scanner.rb', line 5

def initialize(str)
  @str = str
  @cache = {}
  @pos = 0
  @match = nil
end

Instance Attribute Details

#match ⇒ Object (readonly)

Returns the value of attribute match.



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# File 'lib/ramekin/scanner.rb', line 3

def match
  @match
end

#pos ⇒ Object

Returns the value of attribute pos.



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# File 'lib/ramekin/scanner.rb', line 4

def pos
  @pos
end

Instance Method Details

#[](k) ⇒ Object 



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# File 'lib/ramekin/scanner.rb', line 40

def [](k)
  @match && @match[k]
end

#captures ⇒ Object 



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# File 'lib/ramekin/scanner.rb', line 44

def captures
  @match && @match.captures
end

#eos? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ramekin/scanner.rb', line 36

def eos?
  @pos >= @str.size
end

#inspect ⇒ Object 



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# File 'lib/ramekin/scanner.rb', line 12

def inspect
  prev = @str[@pos-5...@pos]
  prev = "...#{prev}" if @pos > 5
  prev = "#{prev} " unless prev.empty?

  post = @str[@pos+1...@pos+5]
  post = "#{post}..." unless @pos+5 >= @str.length
  post = " #{post}" unless post.empty?

  "Scanner([#{@pos}] #{prev}>#{@str[@pos]}<#{post})"
end

#peek(n = 1) ⇒ Object 



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# File 'lib/ramekin/scanner.rb', line 32

def peek(n=1)
  @str[@pos...@pos+n]
end

#scan(re) ⇒ Object 



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# File 'lib/ramekin/scanner.rb', line 24

def scan(re)
  anchored = anchored_re(re)

  @match = anchored.match(@str, @pos)
  @pos = @match.end(0) if @match
  @match
end