Philip TAYLOR (Webmaster, Ret'd) wrote:

Yes, that is the right approach, but implementing it successfully
requires use of \uccode & \uppercase, or \lccode and \lowercase,
and the \uppercase/lowercase primitives are, in general, very
poorly understood. Perhaps easier is to make use of the fact
that Michael has \XeTeXinterchartoks available to him :

I failed to notice the existence of \newXeTeXintercharclass;
here is an improved version :

                \documentclass {minimal}
                \usepackage {fontspec}
                \setmainfont {Comic Sans MS}
                \newfontfamily \Latinfont {Comic Sans MS}
                \newfontfamily \Cherokeefont {Code2000}
                \newXeTeXintercharclass \Cherokeeclass
                \newcount \n
                \def \TreatCherokeeCharactersSpecially
                        {\n = "13A0
                         \loop
                                \XeTeXcharclass \n = \Cherokeeclass \relax
                         \ifnum\n < "13FF
                                \advance \n by 1 \relax
                         \repeat
                         \XeTeXinterchartokenstate = 1
                         \XeTeXinterchartoks 0 \Cherokeeclass = {\Cherokeefont}
                         \XeTeXinterchartoks \Cherokeeclass 0 = {\Latinfont}
                         \XeTeXinterchartoks 255 \Cherokeeclass = 
{\Cherokeefont}
                         \XeTeXinterchartoks \Cherokeeclass 255 = {\Latinfont}
                        }
                \begin {document}
                The Cherokee alphabet is a Syllabary.
                
                ᏌᏊ: Sah-Gwoo (the "g" here is a bit hard, more like a "k", but 
not that hard)
                
                ᏍᎪᎯ: Skoh-Hee (the "k" here is a bit soft, more like a "g", but 
not that soft)
                
                \TreatCherokeeCharactersSpecially
                
                The Cherokee alphabet is a Syllabary.
                
                ᏌᏊ: Sah-Gwoo (the "g" here is a bit hard, more like a "k", but 
not that hard)
                
                ᏍᎪᎯ: Skoh-Hee (the "k" here is a bit soft, more like a "g", but 
not that soft)
                
                \end {document}

** Phil.


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