Function document 

fn document(
    tokens: &mut TokenSlice<'_, Token>,
    receiver: &mut dyn EventReceiver,
    error: &mut dyn ErrorSink,
)

Parse a TOML Document

Only the order of Events is validated and not Event content nor semantics like duplicate keys.

toml = expression *( newline expression )

expression =  ws [ comment ]
expression =/ ws keyval ws [ comment ]
expression =/ ws table ws [ comment ]

;; Key-Value pairs

keyval = key keyval-sep val

key = simple-key / dotted-key
simple-key = quoted-key / unquoted-key

quoted-key = basic-string / literal-string
dotted-key = simple-key 1*( dot-sep simple-key )

dot-sep   = ws %x2E ws  ; . Period
keyval-sep = ws %x3D ws ; =

val = string / boolean / array / inline-table / date-time / float / integer

;; Array

array = array-open [ array-values ] ws-comment-newline array-close

array-open =  %x5B ; [
array-close = %x5D ; ]

array-values =  ws-comment-newline val ws-comment-newline array-sep array-values
array-values =/ ws-comment-newline val ws-comment-newline [ array-sep ]

array-sep = %x2C  ; , Comma

;; Table

table = std-table / array-table

;; Standard Table

std-table = std-table-open key std-table-close

;; Inline Table

inline-table = inline-table-open [ inline-table-keyvals ] inline-table-close

inline-table-keyvals = keyval [ inline-table-sep inline-table-keyvals ]

;; Array Table

array-table = array-table-open key array-table-close