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package common
// UnsafeUTF8DecimalCodePointsToInt converts a slice containing
// a series of UTF-8 decimal code points into their integer rapresentation.
//
// It assumes input code points are in the range 48-57.
// Returns a pointer since an empty slice is equal to nil and not to the zero value of the codomain (ie., `int`).
func UnsafeUTF8DecimalCodePointsToInt(chars []uint8) int {
out := 0
ord := 1
for i := len(chars) - 1; i >= 0; i-- {
curchar := int(chars[i])
out += (curchar - '0') * ord
ord *= 10
}
return out
}
// RemoveBytes removes byte at given positions from data byte slice, starting from the given offset.
func RemoveBytes(data []byte, positions []int, offset int) []byte {
// We need a copy here to not modify original data
cp := append([]byte(nil), data...)
for i, pos := range positions {
at := pos - i - offset
cp = append(cp[:at], cp[(at+1):]...)
}
return cp
}
// EscapeBytes adds a backslash to \, ], " characters.
func EscapeBytes(value string) string {
res := ""
for i, c := range value {
// todo(leodido): generalize byte codes (the function should ideally accept a byte slice containing byte codes to escape)
if c == 92 || c == 93 || c == 34 {
res += `\`
}
res += string(value[i])
}
return res
}
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