How to resolve the algorithm Read a configuration file step by step in the Mathematica/Wolfram Language programming language

Published on 22 June 2024 08:30 PM

How to resolve the algorithm Read a configuration file step by step in the Mathematica/Wolfram Language programming language

Table of Contents

Problem Statement

The task is to read a configuration file in standard configuration file format, and set variables accordingly. For this task, we have a configuration file as follows:

For the task we need to set four variables according to the configuration entries as follows:

We also have an option that contains multiple parameters. These may be stored in an array.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Read a configuration file step by step in the Mathematica/Wolfram Language programming language

In the first part is defined a function CreateVar which takes two arguments, x and y, and creates a variable x with the value y.The second parameter y is optional, and defaults to "True". The function checks if the value of y contains a comma. If it does, it splits the string y by the comma and creates a list with the resulting values. It then assigns the list to the variable x. If y does not contain a comma, it simply assigns the string to x.

In the second part is defined a function ImportConfig which takes one argument, configfile, which is the path to a config file. This function reads the config file and creates variables according to the content of the config file.

The function first imports the config file as a list of strings. It then removes any whitespace from the strings and filters out any empty strings or strings that start with "#" or ";". These characters are typically used to denote comments in config files.

The function then splits each string by the first space character, resulting in a pair of strings. The first string is the variable name, and the second string is the value of the variable. If the second string is empty, the variable is set to the boolean value True.

The function then calls the CreateVar function on each pair of strings, which creates the variables in the Wolfram Language.

Finally, the function ImportConfig is called on the file specified by the variable file. This will read the config file and create the variables according to the content of the file.

Source code in the wolfram programming language

ClearAll[CreateVar, ImportConfig];
CreateVar[x_, y_String: "True"] := Module[{},
  If[StringFreeQ[y, ","]
   ,
   ToExpression[x <> "=" <> y]
   ,
   ToExpression[x <> "={" <> StringJoin@Riffle[StringSplit[y, ","], ","] <> "}"]
   ]
  ]
ImportConfig[configfile_String] := Module[{data},
  (*data = ImportString[configfile, "List", "Numeric" -> False];*)
  data=Import[configfile,"List","Numeric"\[Rule]False];

  data = StringTrim /@ data;
  data = Select[data, # =!= "" &];
  data = Select[data, ! StringMatchQ[#, "#" | ";" ~~ ___] &];
  data = If[! StringFreeQ[#, " "], StringSplit[#, " ", 2], {#}] & /@ data;

  CreateVar @@@ data;
 ]
ImportConfig[file]


  

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