Class: Pegex::Grammar::Atoms

Inherits:
Object
  • Object
show all
Defined in:
lib/pegex/grammar/atoms.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Atoms

Returns a new instance of Atoms.



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# File 'lib/pegex/grammar/atoms.rb', line 4

def initialize
  @atoms = {
    # Default whitespace rules for that use '~'
    'ws'      => '<WS>',
    'ws1'     => '<ws>*',
    'ws2'     => '<ws>+',

    # Special rules
    'ALWAYS'  => '',
    'NEVER'   => '(?!)',

    # Basics
    'ALL'     => '[\s\S]',    # Every char (including newline and space)
    'ANY'     => '.',         # Any char (except newline)
    'SPACE'   => '\ ',        # ASCII space char
    'TAB'     => '\t',        # Horizontal tab
    'WS'      => '\s',        # Whitespace
    'NS'      => '\S',        # Not Space
    'NL'      => '\n',        # Newline
    'BREAK'   => '\n',        # Line break (more readable alias for NL)
    'CR'      => '\r',        # Carriage return
    'EOL'     => '\r?\n',     # Unix/DOS line ending
    'DOS'     => '\r\n',      # Windows/DOS line ending
    'EOS'     => '\z',        # End of stream/string/file

    # Common character classes
    'WORD'    => '\w',
    'BLANK'   => '[\ \t]',
    'ALPHA'   => '[a-zA-Z]',
    'LOWER'   => '[a-z]',
    'UPPER'   => '[A-Z]',
    'DIGIT'   => '[0-9]',
    'OCTAL'   => '[0-7]',
    'HEX'     => '[0-9a-fA-F]',
    'ALNUM'   => '[a-zA-Z0-9]',
    'CONTROL' => '[\x00-\x1f]',
    'HICHAR'  => '[\x7f-\x{ffff}]',

    # Ranges - for use inside character classes
    'WORDS'   => '0-9A-Za-z_',
    'BLANKS'  => '\ \t',
    'ALPHAS'  => 'a-zA-Z',
    'LOWERS'  => 'a-z',
    'UPPERS'  => 'A-Z',
    'DIGITS'  => '0-9',
    'OCTALS'  => '0-7',
    'HEXS'    => '0-9a-fA-F',
    'ALNUMS'  => 'a-zA-Z0-9',
    'CONTROLS' => '\x00-\x1f',
    'HICHARS' => '\x7f-\x{ffff}',

    # Paired punctuation
    'SINGLE'  => "'",
    'DOUBLE'  => '"',
    'GRAVE'   => '`',
    'LPAREN'  => '\(',
    'RPAREN'  => '\)',
    'LCURLY'  => '\{',
    'RCURLY'  => '\}',
    'LSQUARE' => '\[',
    'RSQUARE' => '\]',
    'LANGLE'  => '<',
    'RANGLE'  => '>',

    # Other ASCII punctuation
    'BANG'    => '!',
    'AT'      => '\@',
    'HASH'    => '\#',
    'DOLLAR'  => '\$',
    'PERCENT' => '%',
    'CARET'   => '\^',
    'AMP'     => '&',
    'STAR'    => '\*',
    'TILDE'   => '\~',
    'UNDER'   => '_',
    'DASH'    => '\-',
    'PLUS'    => '\+',
    'EQUAL'   => '=',
    'PIPE'    => '\|',
    'BACK'    => '\\\\',
    'COLON'   => ':',
    'SEMI'    => ';',
    'COMMA'   => ',',
    'DOT'     => '\.',
    'QMARK'   => '\?',
    'SLASH'   => '/',

    # Special rules for named control chars
    'BS'      => '\x08',    # Backspace
    'FF'      => '\x12',    # Formfeed
  }
end

Instance Attribute Details

#atoms ⇒ Object

Returns the value of attribute atoms.



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# File 'lib/pegex/grammar/atoms.rb', line 2

def atoms
  @atoms
end