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General Purpose PostScript Generating Utility

7.6.4 Inheriting from Other Style Sheets

It is possible to extend an existing style. The syntax is:

ancestors are ancestor_1[, ancestor_2...] end ancestors

where ancestor1 etc. are style sheet keys.

For semantics, the rules are the following:

• the ancestors are read in order;

• the definition of the current style is read last;

• it is always the last item read which wins (last defined alphabets, case sensitivity, keywords, operators and sequences).

As an example, both C++ and Objective C style sheets extend the C style sheet:

style "Objective C" is #[...] ancestors are c end ancestors #[...] end style

To the biggest surprise of the author, mutually dependent style sheets do work!