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## JSON parser for CMake Module JSONParser.cmake contains macro `sbeParseJson` to parse JSON string stored in given variable (second argument). Macro fills given variable (first argument) with list of all names in JSON string. For each name it creates variable and sets the value from JSON string. To clear created variables use macro `sbeClearJson`. > **Module does not validate given JSON string. If given JSON is malformed, the macro gives unpredictable result.** ### Example JSON to parse: ``` json {"menu": { "header": "SVG Viewer", "items": [ {"id": "Open"}, {"id": "OpenOld", "label": null }, {"id": "OpenNew", "label": "Open New"}, null, {"id": "ZoomIn", "label": ["Zoom In", "Zoom At"] }, {"id": "ZoomOut", "label": { "short": ["zo", "zout"], "long":"Zoom Out" } }, {"id": "OriginalView", "label": "Original View"}, null ], "elements" : ["one", "two", { "number":"three", "Desc": "Number" }, null ] }} ``` Let assume that above JSON is stored in variable `jsonTest` in CMake script. It can be parsed with following lines of code. ``` cmake include(JSONParser.cmake) # name of variable not string itself is passed to macro sbeParseJson sbeParseJson(example jsonTest) # Now you can use parsed variables. foreach(var ${example}) message("${var} = ${${var}}") endforeach() # when you want to access concrete JSON object, use the names in JSON, the array indexes for JSON object MUST be given after '_' # e.g if you want to store value of object 'id' of first element of array 'items' in object 'menu' set(FirstItemId ${example.menu.items_0.id}) # e.g if you want to store 1-th element of array 'short' in object 'label' of 5-th element of array items in object menu set(ShortLabel ${example.menu.items_5.label.short_0}) # When you are done, clean parsed variables sbeClearJson(example) ``` Macro `sbeParseJson` creates following variables and its values (`variable name` = `value`). ``` example.menu.header = SVG Viewer example.menu.items = 0;1;2;3;4;5;6;7 example.menu.items_0.id = Open example.menu.items_1.id = OpenOld example.menu.items_1.label = null example.menu.items_2.id = OpenNew example.menu.items_2.label = Open New example.menu.items_3 = null example.menu.items_4.id = ZoomIn example.menu.items_4.label = 0;1 example.menu.items_4.label_0 = Zoom In example.menu.items_4.label_1 = Zoom At example.menu.items_5.id = ZoomOut example.menu.items_5.label.short = 0;1 example.menu.items_5.label.short_0 = zo example.menu.items_5.label.short_1 = zout example.menu.items_5.label.long = Zoom Out example.menu.items_6.id = OriginalView example.menu.items_6.label = Original View example.menu.items_7 = null example.menu.elements = 0;1;2;3 example.menu.elements_0 = one example.menu.elements_1 = two example.menu.elements_2.number = three example.menu.elements_2.Desc = Number example.menu.elements_3 = null ```