lit, grp, svar, dq, ddq, varb, sq, dsq.

returns varname (no '$') and ok (whether this is a valid varname expansion).

holds control structures: '(' ')' 'for' 'while' etc.

holds real commands.

` (quote-context) (has-subs).

$[ (internals not parsed).

$" (can-extend) (has-subs) (for quotecontext, uses WordTypeDQ).

$( (quote-context) (has-subs).

$(( (internals not parsed).

" (quote-context) (can-extend) (has-subs).

$' (can-extend).

contains other words e.g.

if then else elif fi do done case esac while until for in { } ! (( [[.

(can-extend).

single: & ; | ( ) < > \n multi(2): && || ;; << >> <& >& <> >| (( multi(3): <<- ('((' requires special processing).

(( (internals not parsed).

can-extend: WordTypeLit, WordTypeSimpleVar, WordTypeVarBrace, WordTypeDQ, WordTypeDDQ, WordTypeSQ, WordTypeDSQ.

simplevar $ (can-extend).

' (can-extend).

${ (quote-context) (can-extend) (internals not parsed).