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package main
import (
"regexp"
"strings"
)
// AllCaps is a regex to test if a string identifier is made of
// all upper case letters.
var allCaps = regexp.MustCompile("^[A-Z0-9]+$")
// popCount counts number of bits 'set' in mask.
func popCount(mask uint) uint {
m := uint32(mask)
n := uint(0)
for i := uint32(0); i < 32; i++ {
if m&(1<<i) != 0 {
n++
}
}
return n
}
// pad makes sure 'n' aligns on 4 bytes.
func pad(n int) int {
return (n + 3) & ^3
}
// splitAndTitle takes a string, splits it by underscores, capitalizes the
// first letter of each chunk, and smushes'em back together.
func splitAndTitle(s string) string {
// If the string is all caps, lower it and capitalize first letter.
if allCaps.MatchString(s) {
return strings.Title(strings.ToLower(s))
}
// If the string has no underscores, capitalize it and leave it be.
if i := strings.Index(s, "_"); i == -1 {
return strings.Title(s)
}
// Now split the name at underscores, capitalize the first
// letter of each chunk, and smush'em back together.
chunks := strings.Split(s, "_")
for i, chunk := range chunks {
chunks[i] = strings.Title(strings.ToLower(chunk))
}
return strings.Join(chunks, "")
}
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