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annotate cmd/sievemgr/internal/config/scanner.go @ 22:fc5e6970a0d5 default tip

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Add support for specifying an authorization identity on the command line
author Guido Berhoerster <guido+sievemgr@berhoerster.name>
date Wed, 17 Feb 2021 07:50:55 +0100
parents 4dff4c3f0fbb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5
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1 // Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name>
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2 //
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3 // Permission is hereby granted, free of charge, to any person obtaining
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4 // a copy of this software and associated documentation files (the
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5 // "Software"), to deal in the Software without restriction, including
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6 // without limitation the rights to use, copy, modify, merge, publish,
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7 // distribute, sublicense, and/or sell copies of the Software, and to
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8 // permit persons to whom the Software is furnished to do so, subject to
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9 // the following conditions:
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10 //
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11 // The above copyright notice and this permission notice shall be included
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12 // in all copies or substantial portions of the Software.
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13 //
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14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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17 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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18 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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19 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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20 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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21
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22 package config
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23
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24 import (
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25 "bufio"
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26 "fmt"
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27 "io"
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28 "strings"
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29 "unicode"
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30 )
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31
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32 type token int
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33
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34 const (
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35 tokenEOF token = -(iota + 1)
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36 tokenIllegal
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37 tokenIdent
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38 tokenNumber
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39 tokenString
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40 )
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41
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42 func (tok token) String() string {
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43 switch tok {
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44 case tokenIllegal:
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45 return "illegal"
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46 case tokenEOF:
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47 return "EOF"
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48 case tokenIdent:
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49 return "identifier"
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50 case tokenNumber:
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51 return "number"
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52 case tokenString:
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53 return "string"
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54 default:
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55 return "unknown"
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56 }
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57 }
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58
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59 func isWhitespaceRune(r rune) bool {
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60 return r == ' ' || r == '\t' || r == '\r' || r == '\n'
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61 }
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62
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63 func isIdentRune(r rune) bool {
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64 return r >= 'A' && r <= 'Z' || r >= 'a' && r <= 'z'
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65 }
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66
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67 func isNumberRune(r rune) bool {
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68 return r >= '0' && r <= '9'
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69 }
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70
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71 type scanner struct {
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72 br *bufio.Reader
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73 line int // line number for error messages
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74 r rune // last read rune
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75 rdSize int // last read size
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76 rdOffset int // offset from beginning of file
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77 }
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78
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79 func newScanner(br *bufio.Reader) *scanner {
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80 return &scanner{line: 1, br: br}
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81 }
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82
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83 func (s *scanner) read() error {
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84 var size int
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85 again:
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86 r, size, err := s.br.ReadRune()
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87 if err != nil {
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88 return err
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89 }
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90
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91 // skip over BOM at the beginning of the file
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92 if r == bom && s.rdOffset == 0 {
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93 s.rdOffset += size
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94 goto again
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95 }
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96
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97 if s.r == '\n' {
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98 s.line++
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99 }
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100
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101 s.r = r
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102 s.rdOffset += size
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103 s.rdSize = size
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104
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105 if r == unicode.ReplacementChar && size == 1 {
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106 return fmt.Errorf("illegal UTF-8 sequence")
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107 } else if r == 0 {
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108 return fmt.Errorf("illegal nul byte")
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109 }
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110 return nil
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111 }
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112
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113 func (s *scanner) unread() {
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114 if s.br.UnreadRune() != nil {
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115 return
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116 }
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117
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118 if b, _ := s.br.Peek(1); b[0] == '\n' {
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119 // moved back to the previous line
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120 s.line--
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121 }
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122
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123 s.r = 0
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124 s.rdOffset -= s.rdSize
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125 s.rdSize = 0
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126 }
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127
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parents:
diff changeset
128 func (s *scanner) skipWhitespace() error {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
129 for {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
130 if err := s.read(); err == io.EOF {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
131 break
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
132 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
133 return err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
134 } else if !isWhitespaceRune(s.r) {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
135 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
136 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
137 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
138 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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139 return nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
140 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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141
4dff4c3f0fbb Introduce configuration file where account information is specified
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parents:
diff changeset
142 func (s *scanner) scanIdent() (token, string, error) {
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parents:
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143 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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144 for {
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parents:
diff changeset
145 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
146 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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147 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
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148 return tokenIllegal, "", err
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parents:
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149 }
4dff4c3f0fbb Introduce configuration file where account information is specified
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diff changeset
150 if isIdentRune(s.r) {
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parents:
diff changeset
151 sb.WriteRune(s.r)
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parents:
diff changeset
152 } else if isWhitespaceRune(s.r) {
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parents:
diff changeset
153 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
154 break
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parents:
diff changeset
155 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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156 return tokenIllegal, "", fmt.Errorf("illegal rune in identifier: %q", s.r)
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parents:
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157 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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158 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
159 if sb.Len() == 0 {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
160 return tokenIllegal, "", fmt.Errorf("expected identifier, got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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161 }
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parents:
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162 return tokenIdent, sb.String(), nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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163 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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164
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parents:
diff changeset
165 func (s *scanner) scanNumber() (token, string, error) {
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parents:
diff changeset
166 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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167 for {
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parents:
diff changeset
168 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
169 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
170 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
171 return tokenIllegal, "", err
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
172 }
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parents:
diff changeset
173 if isNumberRune(s.r) {
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parents:
diff changeset
174 sb.WriteRune(s.r)
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parents:
diff changeset
175 } else if isWhitespaceRune(s.r) {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
176 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
177 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
178 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
179 return tokenIllegal, "", fmt.Errorf("illegal rune in number: %q", s.r)
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parents:
diff changeset
180 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
181 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
182 if sb.Len() == 0 {
4dff4c3f0fbb Introduce configuration file where account information is specified
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parents:
diff changeset
183 return tokenIllegal, "", fmt.Errorf("expected number, got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
184 }
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parents:
diff changeset
185 return tokenNumber, sb.String(), nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
186 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
187
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
188 func (s *scanner) scanString() (token, string, error) {
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parents:
diff changeset
189 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
190 return tokenIllegal, "", fmt.Errorf("unexpected EOF")
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
191 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
192 return tokenIllegal, "", err
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
193 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
194
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
195 if s.r != '"' {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
196 return tokenIllegal, "",
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
197 fmt.Errorf("expected '\"', got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
198 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
199
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
200 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
201 var inEscape bool
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
202 for {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
203 if err := s.read(); err == io.EOF {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
204 return tokenIllegal, "", fmt.Errorf("unterminated string")
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
205 } else if err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
206 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
207 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
208
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
209 if s.r == '\\' && !inEscape {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
210 inEscape = true
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
211 } else if s.r == '"' && !inEscape {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
212 break
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
213 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
214 sb.WriteRune(s.r)
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
215 inEscape = false
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
216 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
217 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
218
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
219 return tokenString, sb.String(), nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
220 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
221
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
222 func (s *scanner) scan() (token, string, error) {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
223 if err := s.skipWhitespace(); err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
224 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
225 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
226
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
227 if err := s.read(); err == io.EOF {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
228 return tokenEOF, "", nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
229 } else if err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
230 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
231 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
232 r := s.r
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
233 s.unread()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
234
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
235 switch {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
236 case isIdentRune(r):
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
237 return s.scanIdent()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
238 case isNumberRune(r):
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
239 return s.scanNumber()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
240 case r == '"':
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
241 return s.scanString()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
242 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
243 return tokenIllegal, string(r), nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
244 }