if c.isMapped() {
		return 0
	}
	return (c >> joinShift) & joinMask
}

func (c info) isModifier() bool {
	return c&(modifier|catSmallMask) == modifier
}

func (c info) isViramaModifier() bool {
	return c&(attributesMask|catSmallMask) == viramaModifier

	}
	st := stateStart
	for i := 0; ; {
		jt := x.joinType()
		if s[i:i+sz] == zwj {
			jt = joinZWJ
		} else if s[i:i+sz] == zwnj {
			jt = joinZWNJ
		}
		st = joinStates[st][jt]
		if x.isViramaModifier() {
			st = joinStates[st][joinVirama]
		}
		if i += sz; i == len(s) {
			break
		}
		v, sz = trie.lookupString(s[i:])
		x = info(v)
	}
	if st == stateFAIL || st == stateAfter {

	}
	st := stateStart
	for i := 0; ; {
		jt := x.joinType()
		if s[i:i+sz] == zwj {
			jt = joinZWJ
		} else if s[i:i+sz] == zwnj {
			jt = joinZWNJ
		}
		st = joinStates[st][jt]
		if x.isViramaModifier() {
			st = joinStates[st][joinVirama]
		}
		if i += sz; i == len(s) {
			break
		}
		v, sz = trie.lookupString(s[i:])
		x = info(v)
	}
	if st == stateFAIL || st == stateAfter {