Reading Files in Modelica

Here’s the translation of the Go code for reading files into Modelica, along with explanations in Markdown format suitable for Hugo:

Reading and writing files are basic tasks needed for many Modelica programs. First we’ll look at some examples of reading files.

model ReadingFiles
  import Modelica.Utilities.Files;
  import Modelica.Utilities.Streams;

  function check
    input Boolean condition;
    input String message;
  algorithm
    assert(condition, message);
  end check;

algorithm
  // Perhaps the most basic file reading task is
  // reading a file's entire contents into memory.
  protected
    String content;
  algorithm
    content := Streams.readFile("/tmp/dat");
    Modelica.Utilities.Streams.print(content);

  // You'll often want more control over how and what
  // parts of a file are read. For these tasks, use
  // the Streams.readLine function.
  protected
    Integer lineNumber;
    String line;
  algorithm
    lineNumber := 1;
    while true loop
      (line, endOfFile) := Streams.readLine("/tmp/dat", lineNumber);
      if endOfFile then
        break;
      end if;
      Modelica.Utilities.Streams.print("Line " + String(lineNumber) + ": " + line);
      lineNumber := lineNumber + 1;
    end while;

  // The Streams package doesn't provide direct control over
  // seeking to specific positions in a file. If you need this
  // functionality, you might need to implement it yourself or
  // use external C functions.

  // There is no direct equivalent to bufio in Modelica,
  // but the Streams functions already handle buffering internally.

  // Modelica doesn't require explicit file closing, as it's handled
  // automatically when the model execution ends.

end ReadingFiles;

To run this model:

$ echo "hello" > /tmp/dat
$ echo "modelica" >> /tmp/dat
$ modelica ReadingFiles.mo
hello
modelica
Line 1: hello
Line 2: modelica

Modelica’s file I/O capabilities are more limited compared to Go’s, and some concepts like seeking or buffered I/O don’t have direct equivalents. However, the Modelica.Utilities.Streams package provides the basic functionality for reading files.

Next, we’ll look at writing files in Modelica.

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Reading Files in Modelica