golang.org/x/text@v0.14.0/internal/colltab/weighter_test.go (about)

     1  // Copyright 2014 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 colltab
     6  
     7  // testWeighter is a simple Weighter that returns weights from a user-defined map.
     8  type testWeighter map[string][]Elem
     9  
    10  func (t testWeighter) Start(int, []byte) int       { return 0 }
    11  func (t testWeighter) StartString(int, string) int { return 0 }
    12  func (t testWeighter) Domain() []string            { return nil }
    13  func (t testWeighter) Top() uint32                 { return 0 }
    14  
    15  // maxContractBytes is the maximum length of any key in the map.
    16  const maxContractBytes = 10
    17  
    18  func (t testWeighter) AppendNext(buf []Elem, s []byte) ([]Elem, int) {
    19  	n := len(s)
    20  	if n > maxContractBytes {
    21  		n = maxContractBytes
    22  	}
    23  	for i := n; i > 0; i-- {
    24  		if e, ok := t[string(s[:i])]; ok {
    25  			return append(buf, e...), i
    26  		}
    27  	}
    28  	panic("incomplete testWeighter: could not find " + string(s))
    29  }
    30  
    31  func (t testWeighter) AppendNextString(buf []Elem, s string) ([]Elem, int) {
    32  	n := len(s)
    33  	if n > maxContractBytes {
    34  		n = maxContractBytes
    35  	}
    36  	for i := n; i > 0; i-- {
    37  		if e, ok := t[s[:i]]; ok {
    38  			return append(buf, e...), i
    39  		}
    40  	}
    41  	panic("incomplete testWeighter: could not find " + s)
    42  }