====== Lexical structure ======

Lexical structure of the language is very close to the JavaScript with some minor additions (e.g. ''const'' and ''type'' constructions).

===== Identifiers =====
Identifiers (nmtokens) start with a alphabetic character, '_' or '$' followed by any number of alphabetic characters, '_', '$' or digits ([0-9]). 
<code>
nmtoken -> [a-zA-Z_$]+[a-zA-Z_$0-9]*
</code>


===== Keywords =====
TIScript uses following identifiers as reserved words:  
<code>
type        function    var         if          else     
while       return      for         break       continue 
do          switch      case        default     null     
super       new         try         catch       finally  
throw       typeof      instanceof  in          property 
const       get         set         like
</code>

===== Operators =====
The following operators are supported by the language:
<code>
<=    ==    !=    >=    <<    >>    &&    ||    
++    --    +=    -=    *=    /=    %=    &=
|=    ^=    <<=   >>=   %>    <%    ===   !==
+     -     *     /     ^     |     &
</code>
===== Special tokens =====
Tokens that have special meaning:
<code>
..   []   {}   #   :  ?
</code>


===== Literals =====
TIScript accepts integer numbers, floating point numbers, stings literals, symbols, regexp literals, stream expressions and binary literals.
<code>
integer-literal -> [0-9]+ | '0x' [0-9A-Fa-f]+ | ''' [.] '''
  float-literal -> [0-9]+ '.' [0-9]+
  float-literal -> [0-9]+ '.' 'e'|'E' '+'|'-' [0-9]+
 string-literal -> '"' [.]* '"'
 symbol-literal -> '#' [a-zA-Z_$0-9-]*
 regexp-literal -> '/' <single line regular expression> ['/ig'] ';'
 stream-literal -> '%>' <text> '<%'
 binary-literal -> '*' [A–Za–z0–9+/=]+ ';'
</code>
Examples:
<code>
            34 - Integer
    0xAFED1234 - Integer
           'f' - Integer, code point value
          1.52 - Float 
          1.e2 - Float
         1.e-2 - Float
"Hello world!" - String
          #foo - Symbol
</code>


===== Comments =====
Comment is a sequence of characters ignored by compiler. There are two types of comments:
  * Single line comment: 
<code>'//' <text-no-crlf> end-of-line</code>
  * Multi line comment: 
<code>'/*' <text> '*/'</code>