Keep the good work coming!

BTW, I’ve been taking advantage of your Pin-yin tone tool and hope it’ll make it more comprehendable for my readers. Big thanks!

http://toshuo.com/scripts/canto-tonetool.js

I think I may end up re-writing the whole thing after I get home from work tonight, though. The fact that the “h” can be separated from the vowel with the tonemark means that I’ll have to completely change the tones, mvowel, and ngvowel arrays.

Yes, it can. E.g. number 5 (五 is ng5)

>>3)What are the rules for adding the “h” for fifth, sixth, and seventh tones if the syllable is a dipthong?

As in my previous comment, “h” is inserted after the diphthong but before the final. m, n, ng, k, p, t.

i is part of the diphtong, not final (e.g. paai)

All possible syllables are in the attached spreadsheet on the Chinese forums.

is converted to júng léhui cham tà chìn báak dòhk。

This is our pattern:
ma1 ma2 ma3 ma4 ma5 ma6 ma7
mà mā má ma máh màh mah

léhui is incorrect - should be léuih, but dòhk is good - H is inserted at the end of a final (could be one vowel or a diphtong) but before the final - -t, -p, -n, ng, etc.

Thanks for the effort, I’ll try to check a bit more later. Could I have a look at the codes, please? (canto-tonetool.js)