falcor-path-syntax/spec/language.md

Parser for Falcor Path Syntax

```javascript
// The formal specification of the path-syntax interface provided in falcor.
// The top level spec for the path-syntax
```
###### Top Level
```javascript
<path-syntax> ::= ( <identifier> | <indexer> ) ( .<identifier> | <indexer> )*
```

###### Indexer
```javascript
<indexer> ::= [ <inner-indexer> ]
<inner-indexer> ::= <extended-indentifier> | <range> | <routed-token>
<range> ::= <index>(..|...)<index>
<routed-token> ::= { <inner-routed-token> }
```

###### Identifier
```javascript
<extended-identifier> ::= <index> | <quoted-identifier>
<quoted-identifier> ::= ' <single-quote-escape> ' | " <double-quote-escape> "
```

###### Literals
```javascript
<index> ::= 0-9  
<escape> ::= \  
<single-quote-escape> ::= (<identifier-all>|\')*  
<double-quote-escape> ::= (<identifier-all>|\")*  
<identifier> ::= [a-Z_$]a-Z_$0-9  
<identifier-all> ::= .*  
<inner-routed-token> ::= ranges | integers | keys  
```