golang.org/x/build@v0.0.0-20240506185731-218518f32b70/perf/app/parse.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 app
     6  
     7  import "strings"
     8  
     9  // parseQueryString splits a user-entered query into one or more perfdata server queries.
    10  // The supported query formats are:
    11  //
    12  //	prefix | one vs two  - parsed as "prefix", {"one", "two"}
    13  //	prefix one vs two    - parsed as "", {"prefix one", "two"}
    14  //	anything else        - parsed as "", {"anything else"}
    15  //
    16  // The vs and | separators must not be quoted.
    17  func parseQueryString(q string) (string, []string) {
    18  	var queries []string
    19  	var parts []string
    20  	var prefix string
    21  	quoting := false
    22  	for r := 0; r < len(q); {
    23  		switch c := q[r]; {
    24  		case c == '"' && quoting:
    25  			quoting = false
    26  			r++
    27  		case quoting:
    28  			if c == '\\' {
    29  				r++
    30  			}
    31  			r++
    32  		case c == '"':
    33  			quoting = true
    34  			r++
    35  		case c == ' ', c == '\t':
    36  			switch part := q[:r]; {
    37  			case part == "|" && prefix == "":
    38  				prefix = strings.Join(parts, " ")
    39  				parts = nil
    40  			case part == "vs":
    41  				queries = append(queries, strings.Join(parts, " "))
    42  				parts = nil
    43  			default:
    44  				parts = append(parts, part)
    45  			}
    46  			q = q[r+1:]
    47  			r = 0
    48  		default:
    49  			if c == '\\' {
    50  				r++
    51  			}
    52  			r++
    53  		}
    54  	}
    55  	if len(q) > 0 {
    56  		parts = append(parts, q)
    57  	}
    58  	if len(parts) > 0 {
    59  		queries = append(queries, strings.Join(parts, " "))
    60  	}
    61  	return prefix, queries
    62  }