Checking availability of nested parameters in json config files.

JsonPreprocessor/CJsonPreprocessor.py

@@ -178,6 +178,7 @@ def __init__(self, syntax: CSyntaxType = CSyntaxType.json , currentCfg : dict =
         self.syntax = syntax
         self.currentCfg = currentCfg
         self.lUpdatedParams = []
+        self.lNestedParams = []
 
 
     def __sNormalizePath(self, sPath : str) -> str:
@@ -501,7 +502,16 @@ def jsonLoad(self, jFile : str, masterFile : bool = True):
         except Exception as reason:
             raise Exception(f"Could not read json file '{jFile}' due to: '{reason}'!")
 
-
+        for line in sJsonData.splitlines():
+            if re.match('\s*\"\s*.+\"\s*:\s*.+', line.lower()):
+                key_value = re.split('\"\s*:\s*', line)
+                if re.match('^\s*\${\s*', key_value[0].lower()):
+                    key_value[0] = re.sub('^\s*\"', '', key_value[0])
+                    self.lNestedParams.append(key_value[0])
+                if re.match('^.*\s*\${\s*', key_value[1].lower()):
+                    key_value[1] = re.sub('^\s*\"\s*(.+)\s*\"\s*,*\s*$', '\\1', key_value[1])
+                    self.lNestedParams.append(key_value[1])
+
         currentDir = os.getcwd()
         os.chdir(jsonPath)
 
@@ -524,6 +534,19 @@ def jsonLoad(self, jFile : str, masterFile : bool = True):
         if masterFile:
             for k, v in oJson.items():
                 globals().update({k:v})
+
+            # Checking availability of nested parameters before updating and replacing.
+            for param in self.lNestedParams:
+                parseNestedParam = self.__nestedParamHandler(param)
+                tmpParseNestedParam = re.sub('\\${\s*(.*?)\s*}', '\\1', parseNestedParam)
+                sExec = "value = " + tmpParseNestedParam if isinstance(tmpParseNestedParam, str) else \
+                        "value = " + str(tmpParseNestedParam)
+                try:
+                    ldict = {}
+                    exec(sExec, globals(), ldict)
+                except:
+                    raise Exception(f"The variable '{tmpParseNestedParam}' is not available!")
+
             oJson = self.__updateAndReplaceNestedParam(oJson)
 
         return oJson

JsonPreprocessor/version.py

@@ -18,6 +18,6 @@
 #
 # Version and date of JsonPreprocessor
 #
-VERSION      = "0.1.3"
-VERSION_DATE = "05.07.2022"
+VERSION      = "0.1.4"
+VERSION_DATE = "14.09.2022"