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cmd/go: split out cmd/go/internal/str
This is one CL in a long sequence of changes to break up the go command from one package into a plausible group of packages. This sequence is concerned only with moving code, not changing or cleaning up code. There will still be more cleanup after this sequence. The entire sequence will be submitted together: it is not a goal for the tree to build at every step. For #18653. Change-Id: I63f578f5ac99c707b599ac5659293c46b275567d Reviewed-on: https://go-review.googlesource.com/36190 Reviewed-by: David Crawshaw <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // Copyright 2017 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| // Package str provides string manipulation utilities. | ||
| package str | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "unicode" | ||
| "unicode/utf8" | ||
| ) | ||
|
|
||
| // StringList flattens its arguments into a single []string. | ||
| // Each argument in args must have type string or []string. | ||
| func StringList(args ...interface{}) []string { | ||
| var x []string | ||
| for _, arg := range args { | ||
| switch arg := arg.(type) { | ||
| case []string: | ||
| x = append(x, arg...) | ||
| case string: | ||
| x = append(x, arg) | ||
| default: | ||
| panic("stringList: invalid argument of type " + fmt.Sprintf("%T", arg)) | ||
| } | ||
| } | ||
| return x | ||
| } | ||
|
|
||
| // toFold returns a string with the property that | ||
| // strings.EqualFold(s, t) iff toFold(s) == toFold(t) | ||
| // This lets us test a large set of strings for fold-equivalent | ||
| // duplicates without making a quadratic number of calls | ||
| // to EqualFold. Note that strings.ToUpper and strings.ToLower | ||
| // do not have the desired property in some corner cases. | ||
| func toFold(s string) string { | ||
| // Fast path: all ASCII, no upper case. | ||
| // Most paths look like this already. | ||
| for i := 0; i < len(s); i++ { | ||
| c := s[i] | ||
| if c >= utf8.RuneSelf || 'A' <= c && c <= 'Z' { | ||
| goto Slow | ||
| } | ||
| } | ||
| return s | ||
|
|
||
| Slow: | ||
| var buf bytes.Buffer | ||
| for _, r := range s { | ||
| // SimpleFold(x) cycles to the next equivalent rune > x | ||
| // or wraps around to smaller values. Iterate until it wraps, | ||
| // and we've found the minimum value. | ||
| for { | ||
| r0 := r | ||
| r = unicode.SimpleFold(r0) | ||
| if r <= r0 { | ||
| break | ||
| } | ||
| } | ||
| // Exception to allow fast path above: A-Z => a-z | ||
| if 'A' <= r && r <= 'Z' { | ||
| r += 'a' - 'A' | ||
| } | ||
| buf.WriteRune(r) | ||
| } | ||
| return buf.String() | ||
| } | ||
|
|
||
| // FoldDup reports a pair of strings from the list that are | ||
| // equal according to strings.EqualFold. | ||
| // It returns "", "" if there are no such strings. | ||
| func FoldDup(list []string) (string, string) { | ||
| clash := map[string]string{} | ||
| for _, s := range list { | ||
| fold := toFold(s) | ||
| if t := clash[fold]; t != "" { | ||
| if s > t { | ||
| s, t = t, s | ||
| } | ||
| return s, t | ||
| } | ||
| clash[fold] = s | ||
| } | ||
| return "", "" | ||
| } | ||
|
|
||
| // Contains reports whether x contains s. | ||
| func Contains(x []string, s string) bool { | ||
| for _, t := range x { | ||
| if t == s { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |
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