Class: LineInput

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

Overview

Utility class for line-wise file parsing

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/bitclust/lineinput.rb', line 20

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

Class Method Details

.for_string(s) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 16

def LineInput.for_string(s)
  new(StringIO.new(s))
end

Instance Method Details

#eachObject


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# File 'lib/bitclust/lineinput.rb', line 103

def each
  while line = gets()
    yield line
  end
end

#eof?Boolean

Returns:

  • (Boolean)

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

def eof?
  @eof_p
end

#getblock(term_re) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 159

def getblock(term_re)
  buf = []
  until_terminator(term_re) do |line|
    buf.push line
  end
  buf
end

#getlines_until(re) ⇒ Object Also known as: break


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# File 'lib/bitclust/lineinput.rb', line 141

def getlines_until(re)
  buf = []
  until_match(re) do |line|
    buf.push line
  end
  buf
end

#getlines_while(re) ⇒ Object Also known as: span


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# File 'lib/bitclust/lineinput.rb', line 120

def getlines_while(re)
  buf = []
  while_match(re) do |line|
    buf.push line
  end
  buf
end

#getsObject


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# File 'lib/bitclust/lineinput.rb', line 43

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
  line
end

#gets_if(re, index = nil) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 84

def gets_if(re, index = nil)
  line = gets()
  if not line or not (re =~ line)
    ungets line
    return nil
  end
  return $~[index] if index
  line
end

#gets_unless(re) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 94

def gets_unless(re)
  line = gets()
  if not line or re =~ line
    ungets line
    return nil
  end
  line
end

#inspectObject


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

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

#linenoObject


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

def lineno
  @lineno
end

#next?Boolean

Returns:

  • (Boolean)

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# File 'lib/bitclust/lineinput.rb', line 68

def next?
  peek() ? true : false
end

#pathObject


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

def path
  @input.path
end

#peekObject


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# File 'lib/bitclust/lineinput.rb', line 62

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

#skip_blank_linesObject


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# File 'lib/bitclust/lineinput.rb', line 72

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

#ungets(line) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 55

def ungets(line)
  return unless line
  @lineno -= 1
  @buf.push line
  line
end

#until_match(re) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 130

def until_match(re)
  while line = gets()
    if re =~ line
      ungets line
      return
    end
    yield line
  end
  nil
end

#until_terminator(re) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 151

def until_terminator(re)
  while line = gets()
    return if re =~ line   # discard terminal line
    yield line
  end
  nil
end

#while_match(re) ⇒ Object


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# File 'lib/bitclust/lineinput.rb', line 109

def while_match(re)
  while line = gets()
    unless re =~ line
      ungets line
      return
    end
    yield line
  end
  nil
end