class Pegparse::LineCounter
count line number and indent level
Public Class Methods
new()
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# File lib/pegparse/line_counter.rb, line 4 def initialize @line_start_pos = [0] @line_start_pos_noindent = [0] @farthest_pos = 0 end
Public Instance Methods
indent(pos)
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get indent level for the line including pos @param pos [Integer] @return [Integer]
# File lib/pegparse/line_counter.rb, line 57 def indent(pos) line_count, * = position(pos) @line_start_pos_noindent[line_count] - @line_start_pos[line_count] end
memo(pos, str)
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update with partial string @param pos [Integer] position of str relative to whole input @param str [String] partial string
# File lib/pegparse/line_counter.rb, line 13 def memo(pos, str) return if pos + str.size < @farthest_pos raise ArgumentError if pos > @farthest_pos row, * = position(pos) str.each_byte.with_index do |ch, index| if ch == ' '.ord || ch == "\t".ord # 既知のインデントより後ろに空白が続いている場合、インデントの深さを増やす if (pos + index) == (@line_start_pos_noindent[row]) @line_start_pos_noindent[row] += 1 end end if ch == "\n".ord next_line_start_pos = pos + index + 1 if @line_start_pos.last < next_line_start_pos @line_start_pos << next_line_start_pos @line_start_pos_noindent << next_line_start_pos end row += 1 end end if @farthest_pos < pos + str.size @farthest_pos = pos + str.size end end
position(pos)
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get line number and char offset for pos @param pos [Integer] @return [Array]
# File lib/pegparse/line_counter.rb, line 42 def position(pos) if pos >= @line_start_pos.last line_count = @line_start_pos.size - 1 else after_pos_line_head = @line_start_pos.bsearch_index{|x| x > pos} line_count = after_pos_line_head - 1 end char_count = pos - @line_start_pos[line_count] [line_count, char_count] end