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package js
// AsIdentifierName returns true if a valid identifier name is given.
func AsIdentifierName(b []byte) bool {
if len(b) == 0 || !identifierStartTable[b[0]] {
return false
}
i := 1
for i < len(b) {
if identifierTable[b[i]] {
i++
} else {
return false
}
}
return true
}
// AsDecimalLiteral returns true if a valid decimal literal is given.
func AsDecimalLiteral(b []byte) bool {
if len(b) == 0 || (b[0] < '0' || '9' < b[0]) && (b[0] != '.' || len(b) == 1) {
return false
} else if b[0] == '0' {
return len(b) == 1
}
i := 1
for i < len(b) && '0' <= b[i] && b[i] <= '9' {
i++
}
if i < len(b) && b[i] == '.' && b[0] != '.' {
i++
for i < len(b) && '0' <= b[i] && b[i] <= '9' {
i++
}
}
return i == len(b)
}
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