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module Lrama
class Lexer
class Location
attr_reader :grammar_file, :first_line, :first_column, :last_line, :last_column
def initialize(grammar_file:, first_line:, first_column:, last_line:, last_column:)
@grammar_file = grammar_file
@first_line = first_line
@first_column = first_column
@last_line = last_line
@last_column = last_column
end
def ==(other)
self.class == other.class &&
self.grammar_file == other.grammar_file &&
self.first_line == other.first_line &&
self.first_column == other.first_column &&
self.last_line == other.last_line &&
self.last_column == other.last_column
end
def partial_location(left, right)
offset = -first_column
new_first_line = -1
new_first_column = -1
new_last_line = -1
new_last_column = -1
_text.each.with_index do |line, index|
new_offset = offset + line.length + 1
if offset <= left && left <= new_offset
new_first_line = first_line + index
new_first_column = left - offset
end
if offset <= right && right <= new_offset
new_last_line = first_line + index
new_last_column = right - offset
end
offset = new_offset
end
Location.new(
grammar_file: grammar_file,
first_line: new_first_line, first_column: new_first_column,
last_line: new_last_line, last_column: new_last_column
)
end
def to_s
"#{path} (#{first_line},#{first_column})-(#{last_line},#{last_column})"
end
def generate_error_message(error_message)
<<~ERROR.chomp
#{path}:#{first_line}:#{first_column}: #{error_message}
#{line_with_carets}
ERROR
end
def line_with_carets
<<~TEXT
#{text}
#{carets}
TEXT
end
private
def path
grammar_file.path
end
def blanks
(text[0...first_column] or raise "#{first_column} is invalid").gsub(/[^\t]/, ' ')
end
def carets
blanks + '^' * (last_column - first_column)
end
def text
@text ||= _text.join("\n")
end
def _text
@_text ||=begin
range = (first_line - 1)...last_line
grammar_file.lines[range] or raise "#{range} is invalid"
end
end
end
end
end
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