finl-charsub

Purpose

This is a Rust library for doing character replacement on strings. A standard character substitution definition file have a string of characters for the input substitution, followed by white space and then the replacement text. For example, the standard TeX input conventions can be reproduced using: ` ‘ `` “ ' ’ '' ” -- – --- — !` ¡ ?` ¿ ~ \u{a0} Escaping is handled following Rust conventions. If white space is to be used in the source or replacement text, it should be entered using escape codes (so \u{20}) to get a space. I wouldn't recommend that, however.

Another example showing Sylvio Levy's scheme for input of classical Greek with ASCII input:¹ `` a α 'a ά a ὰ ~a ᾶ

a ἀ 'a ἄ a ἂ ~a ἆ <a ἁ <'a ἅ <a ἃ <~a ἃ α| \u{1fb3} 'a| \u{1fb4} a| \u{1fb2} ~a| \u{1fb7} a| \u{1f80} 'a| \u{1f84} a| \u{1f82} ~a| \u{1f86}

This is not meant as a replacement for a shaping library, but as a supplement to it. In finl, charsubs will be applied before the shaping library is called but after all formatting commands

1. http://tug2.tug.org/TUGboat/tb09-1/tb20levy.pdf