Text Function

A text function matches text at the cursor by a rule other than “these exact characters”. All three are written under the tex namespace.

Function	Matches
`order`	as many characters as the argument has, in any order
`oneof`	one character, from those in the argument
`icase`	the argument exactly, ignoring case

A = tex::order("ABC"); # "BCA" and "CAB" match; "ABD" does not
B = tex::oneof("ABC"); # one character: A, B or C
C = tex::icase("ABC"); # "abc", "AbC", "ABC"

Over a variable

The argument is a literal, or a variable holding one:

texvar word = "xml";
semvar names = "alpha", "beta";

A = tex::icase(word);    # whatever word holds, ignoring case
B = tex::icase(names);   # any member of the set, ignoring case

Writing word on its own already matches what it holds — that is how an XML end tag is made to repeat its start tag. The function only says how to match it.

A numvar is refused: it holds a number, and these match text.

Chaining

The calls chain, and each one narrows how the match is made:

D = tex::icase::oneof("aeiou");   # one vowel, either case