+ fullblown parser using parboiled2

[maqdev]

Features:

• full JSON constants parser (numbers, strings, objects, etc)
• standard operators (with precedence)
• built-in functions
• provides AST for more agile implementation and evaluation
• supports identifiers with namespace (.) and backtick escaping like abc
• accepts binders Value context to access external data
• allows to extend with external functions

[maqdev]

Я существующий парсер пока не трогал.