Class: Puppet::Pops::Parser::Locator::AbstractLocator

Inherits:
Puppet::Pops::Parser::Locator show all
Defined in:
lib/puppet/pops/parser/locator.rb

Direct Known Subclasses

Locator19, LocatorForChars

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Puppet::Pops::Parser::Locator

#char_length, #char_offset, locator, #offset_on_line

Constructor Details

#initialize(string, file, index = nil) ⇒ AbstractLocator

Create a locator based on a content string, and a boolean indicating if ruby version support multi-byte strings or not.



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# File 'lib/puppet/pops/parser/locator.rb', line 135

def initialize(string, file, index = nil)
  @string = string.freeze
  @file = file.freeze
  @prev_offset = nil
  @prev_line = nil
  @line_index = index
  compute_line_index if index.nil?
end

Instance Attribute Details

#file ⇒ Object (readonly) 



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# File 'lib/puppet/pops/parser/locator.rb', line 130

def file
  @file
end

#line_index ⇒ Object 



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# File 'lib/puppet/pops/parser/locator.rb', line 125

def line_index
  @line_index
end

#prev_line ⇒ Object 



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# File 'lib/puppet/pops/parser/locator.rb', line 128

def prev_line
  @prev_line
end

#prev_offset ⇒ Object 



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# File 'lib/puppet/pops/parser/locator.rb', line 127

def prev_offset
  @prev_offset
end

#string ⇒ Object 



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# File 'lib/puppet/pops/parser/locator.rb', line 126

def string
  @string
end

Instance Method Details

#ary_bsearch_i(ary, value) ⇒ Object

Returns the index of the smallest item for which the item > the given value This is a min binary search. Although written in Ruby it is only slightly slower than the corresponding method in C in Ruby 2.0.0 - the main benefit to use this method over the Ruby C version is that it returns the index (not the value) which means there is not need to have an additional structure to get the index (or record the index in the structure). This saves both memory and CPU. It also does not require passing a block that is called since this method is specialized to search the line index.



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# File 'lib/puppet/pops/parser/locator.rb', line 165

def ary_bsearch_i(ary, value)
  low = 0
  high = ary.length
  mid = nil
  smaller = false
  satisfied = false
  v = nil

  while low < high do
      mid = low + ((high - low) / 2)
      v = (ary[mid] > value)
      if v == true
        satisfied = true
        smaller = true
      elsif !v
        smaller = false
      else
        raise TypeError, "wrong argument, must be boolean or nil, got '#{v.class}'"
      end

      if smaller
        high = mid
      else
        low = mid + 1;
      end
  end

  return nil if low == ary.length
  return nil if !satisfied
  return low
end

#compute_line_index ⇒ Object

Common impl for 18 and 19 since scanner is byte based



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# File 'lib/puppet/pops/parser/locator.rb', line 198

def compute_line_index
  scanner = StringScanner.new(string)
  result = [0] # first line starts at 0
  while scanner.scan_until(/\n/)
    result << scanner.pos
  end
  self.line_index = result.freeze
end

#line_for_offset(offset) ⇒ Object

Returns the line number (first line is 1) for the given offset



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# File 'lib/puppet/pops/parser/locator.rb', line 208

def line_for_offset(offset)
  if prev_offset == offset
    # use cache
    return prev_line
  end
  if line_nbr = ary_bsearch_i(line_index, offset)
    # cache
    prev_offset = offset
    prev_line = line_nbr
    return line_nbr
  end
  # If not found it is after last
  # clear cache
  prev_offset = prev_line = nil
  return line_index.size
end

#pos_on_line(offset) ⇒ Object

Returns the position on line (first position on a line is 1)



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# File 'lib/puppet/pops/parser/locator.rb', line 145

def pos_on_line(offset)
  offset_on_line(offset) +1
end

#to_location_hash(reported_offset, end_offset) ⇒ Object 



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# File 'lib/puppet/pops/parser/locator.rb', line 149

def to_location_hash(reported_offset, end_offset)
  pos        = pos_on_line(reported_offset)
  offset     = char_offset(reported_offset)
  length     = char_length(reported_offset, end_offset)
  start_line = line_for_offset(reported_offset)
  { :line => start_line, :pos => pos, :offset => offset, :length => length}
end