Class: Maps::Parser

Inherits:
Object
  • Object
show all
Includes:
Grammar
Defined in:
lib/rookout/processor/paths/canopy/maps.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Grammar

#_read___, #_read_apostrophe_string, #_read_atom, #_read_boolean_, #_read_chr, #_read_comp_expression, #_read_comp_expression_ex, #_read_float_, #_read_func_call, #_read_func_call_access, #_read_list, #_read_map_access, #_read_namespace, #_read_null_, #_read_number, #_read_opt_, #_read_string, #_read_undefined_, #_read_unicode_set, #_read_unicode_set_with_numbers, #_read_variable, #_read_variable_access

Constructor Details

#initialize(input, actions, types) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rookout/processor/paths/canopy/maps.rb', line 2796

def initialize(input, actions, types)
  @input = input
  @input_size = input.size
  @actions = actions
  @types = types
  @offset = 0
  @cache = Hash.new { |h,k| h[k] = {} }
  @failure = 0
  @expected = []
end

Class Method Details

.format_error(input, offset, expected) ⇒ Object 



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# File 'lib/rookout/processor/paths/canopy/maps.rb', line 2819

def self.format_error(input, offset, expected)
  lines, line_no, position = input.split(/\n/), 0, 0
  while position <= offset
    position += lines[line_no].size + 1
    line_no += 1
  end
  message, line = "Line #{line_no}: expected #{expected * ", "}\n", lines[line_no - 1]
  message += "#{line}\n"
  position -= line.size + 1
  message += " " * (offset - position)
  return message + "^"
end

Instance Method Details

#parse ⇒ Object

Raises:



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# File 'lib/rookout/processor/paths/canopy/maps.rb', line 2807

def parse
  tree = _read_comp_expression
  if tree != FAILURE and @offset == @input_size
    return tree
  end
  if @expected.empty?
    @failure = @offset
    @expected << "<EOF>"
  end
  raise ParseError, Parser.format_error(@input, @failure, @expected)
end