Writing Files in Modelica

Here’s the translation of the Go code to Modelica, with explanations in Markdown format suitable for Hugo:

Writing files in Modelica follows similar patterns to those used for reading.

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

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

algorithm
  // To start, here's how to write a string to a file.
  Files.writeFile("dat1.txt", "hello\nModelica\n");
  
  // For more granular writes, open a file for writing.
  Files.open("dat2.txt", "w");
  
  // It's good practice to close the file when we're done.
  when terminal() then
    Files.close("dat2.txt");
  end when;
  
  // You can write strings as you'd expect.
  Streams.print("some", "dat2.txt");
  Streams.print("\n", "dat2.txt");
  
  // Another way to write a string.
  Streams.print("writes\n", "dat2.txt");
  
  // Modelica doesn't have a direct equivalent to Go's Sync(),
  // but Files.flush() can be used to ensure all data is written.
  Files.flush("dat2.txt");
  
  // Modelica doesn't have a built-in buffered writer,
  // but you can implement your own buffering if needed.
  Streams.print("buffered\n", "dat2.txt");
  
  // Again, use Files.flush() to ensure all data is written.
  Files.flush("dat2.txt");

end WriteFiles;

Try running the file-writing code.

$ modelica WriteFiles.mo
$ ./WriteFiles

Then check the contents of the written files.

$ cat dat1.txt
hello
Modelica

$ cat dat2.txt
some
writes
buffered

In Modelica, file operations are handled differently compared to many other programming languages. The language provides utilities for file operations through the Modelica.Utilities.Files and Modelica.Utilities.Streams packages.

Note that Modelica doesn’t have the concept of byte slices or direct byte writing as in some other languages. Instead, it primarily deals with strings when writing to files.

Also, Modelica doesn’t have an exact equivalent to Go’s defer statement. However, we can use the when terminal() construct to ensure that files are closed when the simulation ends.

Modelica’s approach to file I/O is more high-level and abstracted compared to languages like Go. It doesn’t provide as fine-grained control over the writing process, but it offers a simpler interface for basic file operations.

Next, we’ll look at applying some of these file I/O ideas to input and output streams.

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Writing Files in Modelica