issue56777.go

     1  // compile
     2  
     3  // Copyright 2022 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package p
     8  
     9  func fn(setText []rune, negate bool) int {
    10  	ranges := []singleRange{}
    11  
    12  	if len(setText) > 0 {
    13  		fillFirst := false
    14  		l := len(setText)
    15  		if negate {
    16  			if setText[0] == 0 {
    17  				setText = setText[1:]
    18  			} else {
    19  				l++
    20  				fillFirst = true
    21  			}
    22  		}
    23  
    24  		if l%2 == 0 {
    25  			ranges = make([]singleRange, l/2)
    26  		} else {
    27  			ranges = make([]singleRange, l/2+1)
    28  		}
    29  
    30  		first := true
    31  		if fillFirst {
    32  			ranges[0] = singleRange{first: 0}
    33  			first = false
    34  		}
    35  
    36  		i := 0
    37  		for _, r := range setText {
    38  			if first {
    39  				// lower bound in a new range
    40  				ranges[i] = singleRange{first: r}
    41  				first = false
    42  			} else {
    43  				ranges[i].last = r - 1
    44  				i++
    45  				first = true
    46  			}
    47  		}
    48  	}
    49  
    50  	return len(ranges)
    51  }
    52  
    53  type singleRange struct {
    54  	first rune
    55  	last  rune
    56  }
    57
View as plain text