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fold.go (935B)

      1 // Copyright 2016 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package cases
      6 
      7 import "golang.org/x/text/transform"
      8 
      9 type caseFolder struct{ transform.NopResetter }
     10 
     11 // caseFolder implements the Transformer interface for doing case folding.
     12 func (t *caseFolder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
     13 	c := context{dst: dst, src: src, atEOF: atEOF}
     14 	for c.next() {
     15 		foldFull(&c)
     16 		c.checkpoint()
     17 	}
     18 	return c.ret()
     19 }
     20 
     21 func (t *caseFolder) Span(src []byte, atEOF bool) (n int, err error) {
     22 	c := context{src: src, atEOF: atEOF}
     23 	for c.next() && isFoldFull(&c) {
     24 		c.checkpoint()
     25 	}
     26 	return c.retSpan()
     27 }
     28 
     29 func makeFold(o options) transform.SpanningTransformer {
     30 	// TODO: Special case folding, through option Language, Special/Turkic, or
     31 	// both.
     32 	// TODO: Implement Compact options.
     33 	return &caseFolder{}
     34 }