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GNOME Calculator ... a library in the making

Submitted by Roy Schestowitz on Saturday 5th of January 2019 04:19:59 PM Filed under
GNOME

GNOME calculator is a handy little application. Long story short, it is a calculator application for GNOME as you all know. Written (and rewritten) for GNOME, it includes lexer, parser, and evaluation of expressions, plus a GTK+-based user interface to access the features of the calculation engine. This "engine" currently lives inside the projects' tree lib folder, and is used as a static library for the application. The library seemed fairly well split from the user interface, but it turned out there is a dependency on gtk textview, because of a mathematical equation subclassing Gtk.SourceBuffer (from gtktextview library) for easier handling, which is a subclass of Gtk.TextBuffer (from gtk+). So gtk+ is a transitive dependency of the calculator library. Moreso, the library also has a direct dependency on gtk+ due to having a reference to a Gtk.TextTag for "marking" the answer part of the equation to be able to reuse it and/or find it programatically in the text view or visually by marking it with bold characters.

With all these stated, you can see that if you would like to build a simple console application for evaluating expressions using this library, you would have to pull in gtk and gtksourceview as a dependency, which might not be the best thing to do.

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