Convert various input as features into a simple list, for input as a sequence in e.g.
tokens_compound.
features2list(features)the input features, one of:
character vector, whose elements will be split on whitespace;
list of characters, consisting of a list of token patterns, separated by white space;
tokens object;
dictionary object;
collocations object.
an unnamed list of features, with each element of the list a character vector with the split sequence.