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export enum VowelHeight {
Open,
NearOpen,
OpenMid,
Mid,
CloseMid,
NearClose,
Close,
}
export enum VowelDepth {
Front,
Central,
Back,
}
export interface VowelFeatures {
height: VowelHeight;
depth: VowelDepth;
round: boolean;
long: boolean;
nasal: boolean;
}
export function vowelFeaturesToIpa(features: VowelFeatures): string {
const ipa = () => {
switch (features.height) {
case VowelHeight.Open:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'ɶ' : 'a';
case VowelDepth.Central:
return features.round ? 'ɞ' : 'ä';
case VowelDepth.Back:
return features.round ? 'ɒ' : 'ɑ';
}
case VowelHeight.NearOpen:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'ɶ' : 'æ';
case VowelDepth.Central:
return features.round ? 'ɞ' : 'ɐ';
case VowelDepth.Back:
return features.round ? 'ɒ' : 'ɑ';
}
case VowelHeight.OpenMid:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'œ' : 'ɛ';
case VowelDepth.Central:
return features.round ? 'ɞ' : 'ɜ';
case VowelDepth.Back:
return features.round ? 'ɒ' : 'ɑ';
}
case VowelHeight.Mid:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'ø̞' : 'e̞';
case VowelDepth.Central:
return features.round ? 'ɵ' : 'ə';
case VowelDepth.Back:
return features.round ? 'o̞' : 'ɤ̞';
}
case VowelHeight.CloseMid:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'ø' : 'e';
case VowelDepth.Central:
return features.round ? 'ɵ' : 'ɘ';
case VowelDepth.Back:
return features.round ? 'o' : 'ɤ';
}
case VowelHeight.NearClose:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'ʏ' : 'ɪ';
case VowelDepth.Central:
return features.round ? 'ʉ' : 'ɨ';
case VowelDepth.Back:
return features.round ? 'u' : 'ʊ';
}
case VowelHeight.Close:
switch (features.depth) {
case VowelDepth.Front:
return features.round ? 'y' : 'i';
case VowelDepth.Central:
return features.round ? 'ʉ' : 'ɨ';
case VowelDepth.Back:
return features.round ? 'u' : 'ɯ';
}
default:
throw new Error(`bad vowel height: ${features.height}`);
}
};
const nasal = features.nasal ? '̃' : '';
const vlong = features.long ? 'ː' : '';
return ipa() + nasal + vlong;
}
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