golang.org/x/build@v0.0.0-20240506185731-218518f32b70/perfdata/query/query.go (about)

     1  // Copyright 2017 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 query provides tools for parsing a query.
     6  package query
     7  
     8  // SplitWords splits q into words using shell syntax (whitespace
     9  // can be escaped with double quotes or with a backslash).
    10  func SplitWords(q string) []string {
    11  	var words []string
    12  	word := make([]byte, len(q))
    13  	w := 0
    14  	quoting := false
    15  	for r := 0; r < len(q); r++ {
    16  		switch c := q[r]; {
    17  		case c == '"' && quoting:
    18  			quoting = false
    19  		case quoting:
    20  			if c == '\\' {
    21  				r++
    22  			}
    23  			if r < len(q) {
    24  				word[w] = q[r]
    25  				w++
    26  			}
    27  		case c == '"':
    28  			quoting = true
    29  		case c == ' ', c == '\t':
    30  			if w > 0 {
    31  				words = append(words, string(word[:w]))
    32  			}
    33  			w = 0
    34  		case c == '\\':
    35  			r++
    36  			fallthrough
    37  		default:
    38  			if r < len(q) {
    39  				word[w] = q[r]
    40  				w++
    41  			}
    42  		}
    43  	}
    44  	if w > 0 {
    45  		words = append(words, string(word[:w]))
    46  	}
    47  	return words
    48  }