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A Grammar for JSON which specifies which tokens should be discarded
Feed this to -[PKParserFactory parserFromGrammar:assembler:] along with a reference
to an assembler (a call back delegate), and it will return a PKParser object which can
parse strings conforming to this language/grammar.
The when the returned parser is used, the provided assembler will receive method callbacks like:
whenever a grammar production of the corresponding name has been matched.
Each callback method must accept a single PKAssembly argument. The provided assembly
will contain information about the progress made on the the string currently being parsed.
Also the assembly's stack will contain the tokens parsed so far in the current statement.
@start = Empty | array | object;
object = '{' objectContent '}'!;
objectContent = Empty | actualObject;
actualObject = property commaProperty*;
commaProperty = ','! property;
property = QuotedString ':'! val; // NOTE: property names are quoted in JSON
array = '[' arrayContent ']'!;
arrayContent = Empty | actualArray;
actualArray = val commaValue*;
commaValue = ','! val;
val = null | true | false | array | object | Number | QuotedString;
null = 'null'!;
true = 'true'!;
false = 'false'!;