String Formatting in Modelica

model StringFormatting
  record Point
    Integer x;
    Integer y;
  end Point;

  function main
    Point p;
  algorithm
    p := Point(1, 2);
    
    // Modelica doesn't have built-in string formatting like Go's Printf.
    // We'll use the Modelica.Utilities.Strings package for some operations.
    
    // Basic structure printing
    Modelica.Utilities.Streams.print("struct1: " + String(p.x) + "," + String(p.y));
    
    // Type printing
    Modelica.Utilities.Streams.print("type: Point");
    
    // Boolean printing
    Modelica.Utilities.Streams.print("bool: " + String(true));
    
    // Integer printing
    Modelica.Utilities.Streams.print("int: " + String(123));
    
    // Binary representation (custom function needed)
    Modelica.Utilities.Streams.print("bin: " + integerToBinary(14));
    
    // Character printing
    Modelica.Utilities.Streams.print("char: " + String(ASCII(33)));
    
    // Hexadecimal printing (custom function needed)
    Modelica.Utilities.Streams.print("hex: " + integerToHex(456));
    
    // Float printing
    Modelica.Utilities.Streams.print("float1: " + String(78.9));
    
    // Scientific notation (custom function needed)
    Modelica.Utilities.Streams.print("float2: " + realToScientific(123400000.0));
    
    // String printing
    Modelica.Utilities.Streams.print("str1: \"string\"");
    
    // Quoted string
    Modelica.Utilities.Streams.print("str2: \"\\\"string\\\"\"");
    
    // Hex representation of string (custom function needed)
    Modelica.Utilities.Streams.print("str3: " + stringToHex("hex this"));
    
    // Pointer concept doesn't exist in Modelica
    
    // Width formatting (custom function needed)
    Modelica.Utilities.Streams.print("width1: " + formatWidth(12, 6) + formatWidth(345, 6));
    
    // Float width formatting (custom function needed)
    Modelica.Utilities.Streams.print("width2: " + formatFloatWidth(1.2, 6, 2) + formatFloatWidth(3.45, 6, 2));
    
    // String width formatting (custom function needed)
    Modelica.Utilities.Streams.print("width4: " + formatStringWidth("foo", 6) + formatStringWidth("b", 6));
    
    // Modelica doesn't have a direct equivalent to Sprintf, but we can use string concatenation
    String s;
    s := "sprintf: a " + "string";
    Modelica.Utilities.Streams.print(s);
    
    // Modelica doesn't have a direct equivalent to Fprintf, but we can use Modelica.Utilities.Streams.print
    Modelica.Utilities.Streams.print("io: an error");
  end main;
  
  // Custom functions (implementations not provided)
  function integerToBinary
    input Integer i;
    output String s;
  end integerToBinary;
  
  function integerToHex
    input Integer i;
    output String s;
  end integerToHex;
  
  function realToScientific
    input Real r;
    output String s;
  end realToScientific;
  
  function stringToHex
    input String str;
    output String s;
  end stringToHex;
  
  function formatWidth
    input Integer i;
    input Integer width;
    output String s;
  end formatWidth;
  
  function formatFloatWidth
    input Real r;
    input Integer width;
    input Integer precision;
    output String s;
  end formatFloatWidth;
  
  function formatStringWidth
    input String str;
    input Integer width;
    output String s;
  end formatStringWidth;
  
end StringFormatting;

This Modelica code demonstrates string formatting concepts similar to those in the original Go example. However, it’s important to note that Modelica doesn’t have built-in string formatting capabilities as extensive as Go’s. Many of the formatting operations would require custom implementations, which are indicated by the custom function declarations at the end of the model.

Modelica uses the Modelica.Utilities.Streams.print function for output, which is similar to Go’s fmt.Println. For more complex formatting, you would need to implement custom functions or use string concatenation.

Some concepts from the Go example, such as pointers, don’t have direct equivalents in Modelica and are omitted. The binary, hexadecimal, and scientific notation representations would require custom implementations in Modelica.

To run this Modelica code, you would typically use a Modelica simulation environment, which would compile and execute the model. The exact commands would depend on the specific Modelica tool you’re using.

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String Formatting in Modelica