Mercurial > projects > managesieve
annotate parser.go @ 9:c2d5f9cfbb5a v0.8.1 version-0.8.1
Release version 0.8.1
author | Guido Berhoerster <guido+managesieve@berhoerster.name> |
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date | Wed, 03 Feb 2021 13:21:32 +0100 |
parents | 6369453d47a3 |
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rev | line source |
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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 "strings" |
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26 ) |
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27 |
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28 type response int |
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29 |
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30 const ( |
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31 responseInvalid response = iota |
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32 responseOk |
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33 responseNo |
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34 responseBye |
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35 ) |
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36 |
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37 func lookupResponse(s string) response { |
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38 switch s { |
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39 case "OK": |
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40 return responseOk |
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41 case "NO": |
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42 return responseNo |
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43 case "BYE": |
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44 return responseBye |
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45 } |
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46 return responseInvalid |
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47 } |
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48 |
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49 type reply struct { |
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50 lines [][]*token |
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51 resp response |
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52 code string |
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53 codeArgs []string |
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54 msg string |
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55 } |
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56 |
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57 func parseCapabilities(r *reply) (map[string]string, error) { |
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58 capa := make(map[string]string) |
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59 for _, tokens := range r.lines { |
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60 var k, v string |
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61 if tokens[0].typ != tokenQuotedString && |
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62 tokens[0].typ != tokenLiteralString { |
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63 return nil, ParserError("failed to parse capability name: expected string") |
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64 } |
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65 k = strings.ToUpper(tokens[0].literal) |
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66 |
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67 if len(tokens) > 1 { |
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68 if tokens[1].typ != tokenQuotedString && |
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69 tokens[1].typ != tokenLiteralString { |
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70 return nil, ParserError("failed to parse capability value: expected string") |
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71 } |
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72 v = tokens[1].literal |
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73 } |
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74 capa[k] = v |
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75 } |
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76 return capa, nil |
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77 } |
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78 |
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79 type parser struct { |
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80 s *scanner |
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81 } |
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82 |
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83 func (p *parser) isResponseLine(tokens []*token) bool { |
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84 return tokens[0].typ == tokenAtom && |
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85 lookupResponse(tokens[0].literal) != responseInvalid |
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86 } |
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87 |
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88 func (p *parser) parseResponseLine(tokens []*token) (*reply, error) { |
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89 var i int |
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90 next := func() (*token, bool) { |
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91 if i >= len(tokens) { |
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92 return nil, false |
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93 } |
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94 tok := tokens[i] |
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95 i++ |
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96 return tok, true |
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97 } |
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98 |
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99 // response |
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100 tok, cont := next() |
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101 r := &reply{resp: lookupResponse(tok.literal)} |
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102 |
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103 // code starts with left parenthesis |
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104 tok, cont = next() |
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105 if !cont { |
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106 // only response without code and/or message |
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107 return r, nil |
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108 } |
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109 if tok.typ == tokenLeftParenthesis { |
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110 // code atom |
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111 tok, cont = next() |
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112 if !cont || tok.typ != tokenAtom { |
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113 return nil, ParserError("failed to parse response code: expected atom") |
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114 } |
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115 r.code = tok.literal |
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116 |
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117 // followed by zero or more string arguments |
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118 for { |
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119 tok, cont = next() |
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120 if !cont { |
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121 return nil, ParserError("failed to parse response code: unexpected end of line") |
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122 } |
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123 if tok.typ != tokenQuotedString && |
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124 tok.typ != tokenLiteralString { |
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125 break |
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126 } |
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127 r.codeArgs = append(r.codeArgs, tok.literal) |
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128 } |
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129 |
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130 // terminated by a right parenthesis |
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131 if tok.typ != tokenRightParenthesis { |
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132 return nil, ParserError("failed to parse response code: expected right parenthesis") |
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133 } |
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134 |
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135 tok, cont = next() |
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136 if !cont { |
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137 // response with code but no message |
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138 return r, nil |
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139 } |
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140 } |
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141 |
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142 // message string |
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143 if tok.typ != tokenQuotedString && |
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144 tok.typ != tokenLiteralString { |
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145 return nil, ParserError("failed to parse response message: expected string") |
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146 } |
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147 r.msg = strings.TrimSpace(tok.literal) |
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148 |
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149 // end of line |
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150 if _, cont = next(); cont { |
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151 return nil, ParserError("failed to parse response line: unexpected trailing data") |
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152 } |
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153 |
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154 return r, nil |
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155 } |
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156 |
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157 func (p *parser) readLine() ([]*token, error) { |
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158 tokens := make([]*token, 0) |
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159 for { |
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160 tok, err := p.s.scan() |
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161 if err != nil { |
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162 return nil, err |
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163 } |
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164 if tok.typ == tokenCRLF { |
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165 break |
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166 } |
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167 tokens = append(tokens, tok) |
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168 } |
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169 |
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170 return tokens, nil |
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171 } |
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172 |
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173 func (p *parser) readReply() (*reply, error) { |
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174 var r *reply |
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175 var lines [][]*token = make([][]*token, 0, 1) |
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176 for { |
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177 tokens, err := p.readLine() |
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178 if err != nil { |
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179 return nil, err |
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180 } |
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181 if len(tokens) == 0 { |
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182 return nil, ParserError("unexpected empty line") |
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183 } |
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184 // check for response tokens |
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185 if p.isResponseLine(tokens) { |
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186 r, err = p.parseResponseLine(tokens) |
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187 if err != nil { |
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188 return nil, err |
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189 } |
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190 r.lines = lines |
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191 break |
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192 } |
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193 lines = append(lines, tokens) |
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194 } |
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195 |
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196 return r, nil |
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197 } |