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annotate scanner.go @ 12:66b46b3d73be default tip

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author Guido Berhoerster <guido+managesieve@berhoerster.name>
date Tue, 09 Feb 2021 23:01:02 +0100
parents 6369453d47a3
children
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0
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1 // Copyright (C) 2020 Guido Berhoerster <guido+managesieve@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 managesieve
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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 "strconv"
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29 "strings"
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30 "unicode"
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31 )
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32
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33 const ReadLimit = 1 * 1024 * 1024 // 1 MiB
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34
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35 type tokenType int
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36
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37 const (
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38 tokenInvalid tokenType = iota
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39 tokenCRLF
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40 tokenLeftParenthesis
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41 tokenRightParenthesis
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42 tokenAtom
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43 tokenQuotedString
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44 tokenLiteralString
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45 )
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46
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47 type token struct {
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48 typ tokenType
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49 literal string
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50 }
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51
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52 func (t token) String() string {
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53 switch t.typ {
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54 case tokenInvalid:
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55 return "Invalid"
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56 case tokenLeftParenthesis:
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57 return "LeftParenthesis: " + t.literal
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58 case tokenRightParenthesis:
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59 return "RightParenthesis: " + t.literal
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60 case tokenAtom:
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61 return "Atom: " + t.literal
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62 case tokenCRLF:
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63 return fmt.Sprintf("CRLF: %q", t.literal)
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64 case tokenQuotedString:
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65 return fmt.Sprintf("QuotedString: %q", t.literal)
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66 case tokenLiteralString:
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67 return fmt.Sprintf("LiteralString: %q", t.literal)
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68 }
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69 return fmt.Sprintf("unknown token: %q", t.literal)
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70 }
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71
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72 type scanner struct {
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73 lr *io.LimitedReader // do not read from this, only for access to N
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74 br *bufio.Reader // wraps LimitReader
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75 }
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76
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77 func newScanner(r io.Reader) *scanner {
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78 lr := &io.LimitedReader{R: r, N: ReadLimit}
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79 br := bufio.NewReader(lr)
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80 return &scanner{lr, br}
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81 }
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82
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83 func (s *scanner) scanCRLF() (*token, error) {
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84 c, _, err := s.br.ReadRune()
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85 if err != nil {
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86 if err == io.EOF {
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87 err = io.ErrUnexpectedEOF
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88 }
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89 return nil, err
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90 }
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91 literal := string(c)
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92 // accept LF without CR
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93 if c == '\r' {
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94 c, _, err = s.br.ReadRune()
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95 if err != nil {
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96 if err == io.EOF {
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97 err = io.ErrUnexpectedEOF
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98 }
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99 return nil, err
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100 }
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101 literal += string(c)
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102 }
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103 if c != '\n' {
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104 return nil, ParserError(fmt.Sprintf(`expected '\n', got %q`, c))
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105 }
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106 return &token{typ: tokenCRLF, literal: literal}, nil
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107 }
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108
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109 func (s *scanner) scanParenthesis() (*token, error) {
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110 c, _, err := s.br.ReadRune()
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111 if err != nil {
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112 if err == io.EOF {
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113 err = io.ErrUnexpectedEOF
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114 }
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115 return nil, err
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116 }
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117 var typ tokenType
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118 if c == '(' {
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119 typ = tokenLeftParenthesis
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120 } else if c == ')' {
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121 typ = tokenRightParenthesis
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122 } else {
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123 return nil,
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124 ParserError(fmt.Sprintf("expected parenthesis, got %q",
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125 c))
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126 }
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127 return &token{typ: typ, literal: string(c)}, nil
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128 }
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129
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130 func isAtomRune(c rune) bool {
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131 return c == '!' ||
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132 (c >= 0x23 && c <= 0x27) ||
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133 (c >= 0x2a && c <= 0x5b) ||
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134 (c >= 0x5d && c <= 0x7a) ||
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135 (c >= 0x7c && c <= 0x7e)
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136 }
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137
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138 func (s *scanner) scanAtom() (*token, error) {
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139 var sb strings.Builder
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140 var c rune
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141 for {
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142 c, _, err := s.br.ReadRune()
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143 if err != nil {
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144 if err == io.EOF {
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145 err = io.ErrUnexpectedEOF
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146 }
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147 return nil, err
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148 }
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149 if isAtomRune(c) {
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150 sb.WriteRune(unicode.ToUpper(c))
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151 } else {
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152 s.br.UnreadRune()
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
153 break
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
154 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
155 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
156 if sb.Len() == 0 {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
157 return nil, ParserError(fmt.Sprintf("expected atom, got %q", c))
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
158 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
159 return &token{typ: tokenAtom, literal: sb.String()}, nil
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
160 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
161
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
162 func (s *scanner) scanQuotedString() (*token, error) {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
163 c, _, err := s.br.ReadRune()
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
164 if err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
165 if err == io.EOF {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
166 err = io.ErrUnexpectedEOF
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
167 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
168 return nil, err
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
169 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
170 if c != '"' {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
171 return nil, ParserError(fmt.Sprintf("expected '\"', got %q", c))
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
172 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
173 qs, err := s.br.ReadString('"')
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
174 if err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
175 if err == io.EOF {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
176 err = io.ErrUnexpectedEOF
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
177 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
178 return nil, err
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
179 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
180 return &token{typ: tokenQuotedString, literal: qs[:len(qs)-1]},
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
181 nil
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
182 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
183
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
184 func (s *scanner) scanLiteralString() (*token, error) {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
185 c, _, err := s.br.ReadRune()
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
186 if err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
187 if err == io.EOF {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
188 err = io.ErrUnexpectedEOF
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
189 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
190 return nil, err
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
191 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
192 if c != '{' {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
193 return nil, ParserError(fmt.Sprintf("expected '{', got %q", c))
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
194 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
195 nstr, err := s.br.ReadString('}')
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
196 if err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
197 if err == io.EOF {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
198 err = io.ErrUnexpectedEOF
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
199 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
200 return nil, err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
201 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
202 n, err := strconv.ParseUint(nstr[:len(nstr)-1], 10, 32)
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
203 if err != nil {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
204 return nil, ParserError("failed to parse literal string length: " + err.Error())
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
205 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
206 if n > uint64(s.lr.N) {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
207 return nil, ParserError(fmt.Sprintf("string too long: %d", n))
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
208 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
209
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
210 if _, err := s.scanCRLF(); err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
211 return nil, err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
212 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
213
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
214 b := make([]byte, n)
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
215 _, err = io.ReadFull(s.br, b)
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
216 ls := string(b)
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
217 if err != nil {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
218 if err == io.EOF {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
219 err = io.ErrUnexpectedEOF
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
220 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
221 return nil, err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
222 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
223
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
224 return &token{typ: tokenLiteralString, literal: ls}, nil
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
225 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
226
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
227 func (s *scanner) skipSpace() error {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
228 for {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
229 b, err := s.br.ReadByte()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
230 if err != nil {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
231 if err == io.EOF {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
232 err = io.ErrUnexpectedEOF
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
233 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
234 return err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
235 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
236
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
237 if b != ' ' {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
238 s.br.UnreadByte()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
239 break
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
240 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
241 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
242
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
243 return nil
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
244 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
245
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
246 func (s *scanner) scan() (*token, error) {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
247 if err := s.skipSpace(); err != nil {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
248 return nil, err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
249 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
250
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
251 buf, err := s.br.Peek(1)
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
252 if err != nil {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
253 if err == io.EOF {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
254 err = io.ErrUnexpectedEOF
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
255 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
256 return nil, err
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
257 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
258 b := buf[0]
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
259 switch {
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
260 case b == '\r':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
261 fallthrough
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
262 case b == '\n':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
263 return s.scanCRLF()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
264 case b == '"':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
265 return s.scanQuotedString()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
266 case b == '{':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
267 return s.scanLiteralString()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
268 case b == '(':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
269 fallthrough
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
270 case b == ')':
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
271 return s.scanParenthesis()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
272 case isAtomRune(rune(b)):
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
273 return s.scanAtom()
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
274 }
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
275 return nil, ParserError(fmt.Sprintf("invalid character: %q", b))
6369453d47a3 Initial revision
Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
diff changeset
276 }