Class: Flexr::Regexp::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/flexr/regexp/parser.rb

Constant Summary collapse

ESCAPES = 
{
  "n" => 0x0a, "t" => 0x09, "r" => 0x0d, "f" => 0x0c,
  "v" => 0x0b, "a" => 0x07, "e" => 0x1b, "0" => 0
}.freeze
PROPERTY_ALIASES = 
{
  "digit" => "Nd", "alpha" => "Alphabetic", "alnum" => "Alnum",
  "word" => "Word", "space" => "Space"
}.freeze
POSIX_CLASSES = 
%w[alnum alpha blank cntrl digit graph lower print punct space upper xdigit].freeze
LITERAL_ESCAPES = 
(%w[. [ ] { } ( ) * + ? | ^ $ \\ / - #] + [" "]).freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, options: 0, encoding: Encoding::UTF_8, unicode: false) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/flexr/regexp/parser.rb', line 19

def initialize(source, options: 0, encoding: Encoding::UTF_8, unicode: false)
  @source = source
  @options = options
  @encoding = encoding
  @unicode = unicode
  @index = 0
  @class_depth = 0
  offset = 0
  @byte_offsets = [0]
  source.each_char do |character|
    offset += character.bytesize
    @byte_offsets << offset
  end
end

Instance Attribute Details

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/flexr/regexp/parser.rb', line 17

def source
  @source
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/flexr/regexp/parser.rb', line 34

def parse
  node = parse_expression
  raise_syntax("unexpected `#{current}`") unless eof?
  validate_anchor_positions(node)
  node
end