quoted.go

     1  // Copyright 2022 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 main
     6  
     7  import "fmt"
     8  
     9  // quotedSplit is a verbatim copy from cmd/internal/quoted.go:Split and its
    10  // dependencies (isSpaceByte). Since this package is built using the host's
    11  // Go compiler, it cannot use `cmd/internal/...`. We also don't want to export
    12  // it to all Go users.
    13  //
    14  // Please keep those in sync.
    15  func quotedSplit(s string) ([]string, error) {
    16  	// Split fields allowing '' or "" around elements.
    17  	// Quotes further inside the string do not count.
    18  	var f []string
    19  	for len(s) > 0 {
    20  		for len(s) > 0 && isSpaceByte(s[0]) {
    21  			s = s[1:]
    22  		}
    23  		if len(s) == 0 {
    24  			break
    25  		}
    26  		// Accepted quoted string. No unescaping inside.
    27  		if s[0] == '"' || s[0] == '\'' {
    28  			quote := s[0]
    29  			s = s[1:]
    30  			i := 0
    31  			for i < len(s) && s[i] != quote {
    32  				i++
    33  			}
    34  			if i >= len(s) {
    35  				return nil, fmt.Errorf("unterminated %c string", quote)
    36  			}
    37  			f = append(f, s[:i])
    38  			s = s[i+1:]
    39  			continue
    40  		}
    41  		i := 0
    42  		for i < len(s) && !isSpaceByte(s[i]) {
    43  			i++
    44  		}
    45  		f = append(f, s[:i])
    46  		s = s[i:]
    47  	}
    48  	return f, nil
    49  }
    50  
    51  func isSpaceByte(c byte) bool {
    52  	return c == ' ' || c == '\t' || c == '\n' || c == '\r'
    53  }
    54
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