lexical_grammar.txt

## Literals

<escaped_character>  = \" | \\ | \/ | \b | \f | \n | \r | \t  
<character>          = any ASCII character except ", \, and the control characters | <escaped_character>  
<characters>         = <character> <character>*  
<string>             = "" | " <characters> "
<zero>               = 0
<positive_digit>     = [1..9]
<digit>              = <zero> | <positive_digit>
<digits>             = <digit> <digit>*
<integer>            = <zero> | <positive_digit> <digit>*
<fractional_part>    = . <digits>
<exponent_part>      = (E | e) (+ | - | ε) <positive_digit> <digit>*
<decimal>            = (<fractional_part> | <zero> <fractional_part>) (<exponent_part> | ε) |
                       <integer> <fractional_part> |
                       <integer> <exponent_part>
<letter>             = [a-zA-Z]
<operator>           = + | - | * | / | = | > | < | ! | & | % | ~ | $ | ^
<operator_extended>  = <operator> | <operator> = | && | ||
<delimiter>          = { | [ | ( | } | ] | ) | : | ,
<identifier>         = (<letter> | _) (<letter> | <digit> | <operator> | _)*
<newline>            = \n | \r\n
<comment>            = // <character>* <newline>

## Keywords

<abstract>           = abstract
<as>                 = as
<class>              = class
<else>               = else
<extends>            = extends
<false>              = false
<final>              = final
<func>               = func
<for>                = for
<if>                 = if
<in>                 = in
<lazy>               = lazy
<let>                = let
<new>                = new
<null>               = null
<override>           = override
<private>            = private
<protected>          = protected
<return>             = return
<super>              = super
<to>                 = to
<this>               = this
<true>               = true
<var>                = var
<while>              = while