Class Lexer

source code

object --+
         |
        Lexer

Lexical analyzer

Lexer rules:
-----------
* Blank chars are usually ignored. Except from in quotes.
* Quote can be one-line: "quoted value", or multiline:
  '''quoted value1,
     quoted value2,
  '''
* New-line char ends commented line if any.
* Values can be provided as simple literals or quoted ones.
* If value contains spaces or any other non-alphanumeric values it is better
  to quote it or escape it using escapechar.
* Variable can take list of values, separated by comma
* Escaping can only be used in rval position.

Macros:
------
Macros are special internal variables that get expanded upon parsing.
Macro definition is similar to variable definition, but macro char
(default '&') is prepended to var name:
&macro = value
var = &macro