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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # jsonparser-ls 2 | JSON Parser written in LotusScript or VBA 3 | 4 | Here is an example how to use JSONParser. 5 | 6 | Dim parser As JSONParser 7 | Dim jsonObj As JSONObject 8 | Dim jsonArr As JSONArray 9 | Dim jsonString As String 10 | 11 | Set parser = New JSONParser 12 | 13 | 'object 14 | jsonString = |{"array":[1, 2 , 300.56 ] , "boolean":true,"null":null,"number":123,"object":{"a":"b","c":"d","arr":["12","23",34.56],"e":"f","ho":true},"string":"Hello World"}| 15 | Set jsonObj = parser.parse(jsonString) 16 | 'test 17 | Print jsonObj.HasItem("array") 'true 18 | Print jsonObj.HasItem("array1") 'false 19 | print jsonObj.GetItem("array").Items(2) '300.56 20 | print IsNull(jsonObj.GetItem("null")) 'true 21 | print jsonObj.GetItem("number") '123 22 | print jsonObj.GetItem("object").getItem("c") 'd 23 | print jsonObj.GetItem("object").getItem("ho") 'true 24 | print jsonObj.GetItem("object").getItem("arr").Items(2) '34.56 25 | 26 | 'array 27 | jsonString = |[{a:1,b:true,_dd:null},12,"13",true,{}]| 28 | Set jsonArr = parser.parse(jsonString) 29 | 'test 30 | print jsonArr.Items(0).getItem("b") 'true 31 | print jsonArr.Items(1) '12 32 | print jsonArr.Items(2) '13 33 | print jsonArr.Items(3) 'true 34 | print TypeName(jsonArr.Items(4)) '"JSONOBJECT" 35 | -------------------------------------------------------------------------------- /json.ls: -------------------------------------------------------------------------------- 1 | Option Public 2 | Option Declare 3 | 4 | Class JSONParser 5 | Private m_length As long 6 | Private m_decimalSep As String 7 | 8 | Sub New() 9 | End Sub 10 | 11 | Private Property Get getDecimalSep As String 12 | Dim session As NotesSession 13 | Dim international As NotesInternational 14 | 15 | If m_decimalSep = "" Then 16 | Set session = New NotesSession() 17 | Set international = session.International 18 | m_decimalSep = international.DecimalSep 19 | End If 20 | 21 | getDecimalSep = m_decimalSep 22 | End Property 23 | 24 | private Property Get length As long 25 | length = m_length 26 | End Property 27 | 28 | Function parse(jsonString As string) As variant 29 | Dim res As Variant 30 | Dim index1 As long 31 | Dim index2 As Long 32 | 33 | m_length = Len(jsonString) 34 | 35 | index1 = InStr(jsonString, "{") 36 | index2 = InStr(jsonString, "[") 37 | 38 | If index1 > 0 And (index1 < index2 or index2 = 0) Then 39 | Set res = parseObject(jsonString, index1 + 1) 40 | ElseIf index2 > 0 And (index2 < index1 Or index1 = 0) Then 41 | Set res = parseArray(jsonString, index2 + 1) 42 | End If 43 | 44 | Set parse = res 45 | End Function 46 | 47 | Private Function parseObject(jsonString As String, index As long) As JSONObject 48 | Dim res As JSONObject 49 | Dim propertyValue As Variant 50 | Dim propertyName As String 51 | Dim objectEnd As long 52 | Dim nextPair As long 53 | 54 | Set res = New JSONObject() 55 | 56 | nextPair = InStr(index, jsonString, ":") 57 | objectEnd = InStr(index, jsonString, "}") 58 | While nextPair < objectEnd And nextPair > 0 And objectEnd > 0 59 | propertyName = findPropertyName(jsonString, index) 60 | index = InStr(index, jsonString, ":") 61 | index = index + 1 62 | 63 | Call renderValue(jsonString, index, propertyValue) 64 | Call res.AddItem(propertyName, propertyValue) 65 | 66 | nextPair = InStr(index, jsonString, ":") 67 | objectEnd = InStr(index, jsonString, "}") 68 | Wend 69 | 70 | index = objectEnd + 1 71 | 72 | Set parseObject = res 73 | End Function 74 | 75 | Private Function parseArray(jsonString As String, index As Long) As JSONArray 76 | Dim res As JSONArray 77 | Dim propertyValue As Variant 78 | Dim arrString As string 79 | Dim arrEnd As Long 80 | Dim nextVal As Long 81 | 82 | Set res = New JSONArray() 83 | 84 | 'empty array 85 | arrEnd = InStr(index, jsonString, "]") 86 | If arrEnd > 0 Then 87 | arrString = Mid(jsonString, index, arrEnd - index) 88 | If Trim(arrString) = "" Then 89 | Set parseArray = res 90 | Exit Function 91 | End If 92 | End If 93 | 94 | nextVal = InStr(index, jsonString, ",") 95 | Do 96 | Call renderValue(jsonString, index, propertyValue) 97 | If Not IsEmpty(propertyValue) Then 98 | Call res.AddItem(propertyValue) 99 | End If 100 | 101 | nextVal = InStr(index, jsonString, ",") 102 | arrEnd = InStr(index, jsonString, "]") 103 | Loop While nextVal < arrEnd And nextVal > 0 And arrEnd > 0 104 | 105 | index = arrEnd + 1 106 | 107 | Set parseArray = res 108 | End Function 109 | 110 | Private Function renderValue(jsonString As String, index As long, propertyValue As Variant) As Variant 111 | Dim char As String 112 | Dim i As long 113 | 114 | For i = index To length 115 | char = Mid(jsonString, i, 1) 116 | 117 | If char = {"} Then 118 | index = i 119 | propertyValue = findElementString(jsonString, index) 120 | i = length 121 | ElseIf char Like {#} Or char = {-} Then 122 | index = i 123 | propertyValue = findElementNumber(jsonString, index) 124 | i = length 125 | ElseIf char Like {[tfn]} Then 126 | index = i 127 | propertyValue = findElementLiteral(jsonString, index) 128 | i = length 129 | ElseIf char = "{" Then 130 | index = i 131 | Set propertyValue = parseObject(jsonString, index) 132 | i = length 133 | ElseIf char = "[" Then 134 | index = i + 1 135 | Set propertyValue = parseArray(jsonString, index) 136 | i = length 137 | End If 138 | Next 139 | End Function 140 | 141 | Private Function findElementNumber(jsonString As string, index As long) As variant 142 | Dim res As variant 143 | Dim elementEnd As String 144 | Dim char As string 145 | Dim i As long 146 | 147 | elementEnd = |, ]}| 'to catch: close bracket, comma, space or } 148 | For i = index To length 149 | char = Mid(jsonString, i, 1) 150 | 151 | If InStr(elementEnd, char) Then 152 | res = Mid(jsonString, index, i - index) 153 | index = i 154 | i = length 155 | End If 156 | Next 157 | 158 | If InStr(res, ".") And getDecimalSep()<>"." Then 159 | res = Replace(res, ".", getDecimalSep()) 160 | End If 161 | 162 | findElementNumber = cdbl(res) 163 | End Function 164 | 165 | Private Function findElementLiteral(jsonString As String, index As long) As Variant 166 | Dim res As string 167 | Dim elementEnd As String 168 | Dim char As String 169 | Dim i As long 170 | 171 | elementEnd = |, ]}| 'to catch: close bracket, comma, space or } 172 | For i = index To length 173 | char = Mid(jsonString, i, 1) 174 | 175 | If InStr(elementEnd, char) Then 176 | res = Mid(jsonString, index, i - index) 177 | index = i 178 | i = length 179 | End If 180 | Next 181 | 182 | Select Case res: 183 | Case "null": 184 | findElementLiteral = null 185 | Case "true": 186 | findElementLiteral = true 187 | Case "false": 188 | findElementLiteral = false 189 | End Select 190 | End Function 191 | 192 | 'find element in json string 193 | Private Function findElementString(jsonString As String, index As long) As String 194 | Dim res As String 195 | Dim prevIndex2 As string 196 | Dim index1 As long 197 | Dim index2 As long 198 | 199 | index1 = InStr(index, jsonString, {"}) 200 | If index1 = 0 Then Exit Function 201 | 202 | index2 = index1 203 | Do 204 | index2 = InStr(index2 + 1, jsonString, {"}) 205 | prevIndex2 = Mid(jsonString, index2 - 1, 1) 206 | Loop While prevIndex2 = "\" 207 | 208 | res = Mid(jsonString, index1 + 1, index2 - index1 - 1) 209 | 210 | index = index2 + 1 211 | 212 | findElementString = res 213 | End Function 214 | 215 | 'find property name 216 | Private Function findPropertyName(jsonString As String, index As long) As String 217 | Dim res As String 218 | Dim propertyNameEnd As String 219 | Dim char As String 220 | Dim i As long 221 | 222 | 'property start with character 223 | For i = index To length 224 | char = Mid(jsonString, i, 1) 225 | 226 | If char Like {[a-zA-Z_]} Then 227 | res = char 228 | index = i + 1 229 | i = length 230 | End If 231 | Next 232 | 233 | 'rest of property could be characters and numbers etcx 234 | propertyNameEnd = | :"'| 235 | For i = index To length 236 | char = Mid(jsonString, i, 1) 237 | 238 | If InStr(propertyNameEnd, char) Then 239 | index = i 240 | i = length 241 | Else 242 | res = res + char 243 | End If 244 | Next 245 | 246 | findPropertyName = res 247 | End Function 248 | End Class 249 | Class JSONObject 250 | Private m_items List As Variant 251 | 252 | Sub New() 253 | End Sub 254 | 255 | Public Property Get Items As Variant 256 | Items = Me.m_items 257 | End Property 258 | 259 | Public Sub AddItem(itemName As String, itemVal As Variant) 260 | If IsObject(itemVal) Then 261 | Set me.m_items(itemName) = itemVal 262 | Else 263 | me.m_items(itemName) = itemVal 264 | End If 265 | End Sub 266 | 267 | Public Function HasItem(itemName As String) As Variant 268 | HasItem = IsElement(m_items(itemName)) 269 | End Function 270 | 271 | Public Function GetItem(itemName As String) As Variant 272 | If HasItem(itemName) Then 273 | If IsObject(me.Items(itemName)) Then 274 | Set GetItem = me.Items(itemName) 275 | Else 276 | GetItem = me.Items(itemName) 277 | End If 278 | Else 279 | GetItem = Null 280 | End If 281 | End Function 282 | End Class 283 | 284 | Class JSONArray 285 | Private m_items() As Variant 286 | Private m_size As long 287 | 288 | Sub New() 289 | End Sub 290 | 291 | Public Property Get Items As Variant 292 | Items = Me.m_items 293 | End Property 294 | 295 | Public Property Get Size As long 296 | Size = Me.m_size 297 | End Property 298 | 299 | Public Sub AddItem(itemVal As Variant) 300 | m_size = m_size + 1 301 | ReDim Preserve m_items(0 To m_size - 1) As Variant 302 | 303 | If IsObject(itemVal) Then 304 | Set m_items(Size - 1) = itemVal 305 | Else 306 | m_items(Size - 1) = itemVal 307 | End If 308 | End Sub 309 | End Class 310 | --------------------------------------------------------------------------------