Class: ReVIEW::LineInput

Inherits:
Object show all
Defined in:
lib/review/lineinput.rb

Constant Summary collapse

INVALID_CHARACTER_PATTERN =

accept 0x09: TAB, 0x0a: LF, 0x0d: CR

/[\x00-\x08\x0b-\x0c\x0e-\x1f]/

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(f) ⇒ LineInput

Returns a new instance of LineInput.



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# File 'lib/review/lineinput.rb', line 19

def initialize(f)
  @input = f
  @buf = []
  @lineno = 0
  @eof_p = false
end

Instance Attribute Details

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/review/lineinput.rb', line 17

def lineno
  @lineno
end

Class Method Details

.from_string(string) ⇒ Object

Create LineInput from a string directly



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# File 'lib/review/lineinput.rb', line 27

def self.from_string(string)
  new(StringIO.new(string))
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/review/lineinput.rb', line 91

def each
  while line = gets
    yield line
  end
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/review/lineinput.rb', line 35

def eof?
  @eof_p
end

#gets ⇒ Object 



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# File 'lib/review/lineinput.rb', line 51

def gets
  unless @buf.empty?
    @lineno += 1
    return @buf.pop
  end
  return nil if @eof_p # to avoid ARGF blocking.

  line = @input.gets
  @eof_p = true unless line
  @lineno += 1
  invalid_char = lookup_invalid_char(line)
  if invalid_char
    raise SyntaxError, "found invalid control-sequence character (#{sprintf('%#x', invalid_char.codepoints[0])})."
  end

  line
end

#inspect ⇒ Object 



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# File 'lib/review/lineinput.rb', line 31

def inspect
  "#<#{self.class} file=#{@input.inspect} line=#{lineno}>"
end

#next? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/review/lineinput.rb', line 75

def next?
  peek ? true : false
end

#peek ⇒ Object 



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# File 'lib/review/lineinput.rb', line 69

def peek
  line = gets
  ungets(line) if line
  line
end

#skip_blank_lines ⇒ Object 



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# File 'lib/review/lineinput.rb', line 79

def skip_blank_lines
  n = 0
  while line = gets
    unless line.strip.empty?
      ungets(line)
      return n
    end
    n += 1
  end
  n
end

#skip_comment_lines ⇒ Object 



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# File 'lib/review/lineinput.rb', line 39

def skip_comment_lines
  n = 0
  while line = gets
    unless /\A\#@/.match?(line.strip)
      ungets(line)
      return n
    end
    n += 1
  end
  n
end

#until_match(re) ⇒ Object 



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# File 'lib/review/lineinput.rb', line 108

def until_match(re)
  while line = gets
    if re&.match?(line)
      ungets(line)
      return
    end
    yield line
  end
  nil
end

#while_match(re) ⇒ Object 



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# File 'lib/review/lineinput.rb', line 97

def while_match(re)
  while line = gets
    unless re&.match?(line)
      ungets(line)
      return
    end
    yield line
  end
  nil
end