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string: optimize starts_with and ends_with

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yuyi 2020-02-19 22:18:09 +08:00 committed by GitHub
parent e4179c0008
commit 391da0ba07
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1 changed files with 12 additions and 5 deletions
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17
vlib/builtin/string.v
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@ -711,20 +711,27 @@ pub fn (s string) contains(p string) bool {
} }
pub fn (s string) starts_with(p string) bool { pub fn (s string) starts_with(p string) bool {
idx := s.index(p) or { if p.len > s.len {
return false return false
} }
return idx == 0 for i := 0; i < p.len; i++ {
if s[i] != p[i] {
return false
}
}
return true
} }
pub fn (s string) ends_with(p string) bool { pub fn (s string) ends_with(p string) bool {
if p.len > s.len { if p.len > s.len {
return false return false
} }
idx := s.last_index(p) or { for i := 0; i < p.len; i++ {
return false if p[i] != s[s.len - p.len + i] {
return false
}
} }
return idx == s.len - p.len return true
} }
// TODO only works with ASCII // TODO only works with ASCII