[NF] Improve toString functions.

- Implement toString for Variable, Algorithm and FlatModel.
- Improve formatting in Equation.toString and Statement.toString.

Belonging to [master]:
  - #2854

Compiler/NFFrontEnd/NFAlgorithm.mo

@@ -119,5 +119,12 @@ public
     end for;
   end foldExpList;
 
+  function toString
+    input Algorithm alg;
+    output String str;
+  algorithm
+    str := Statement.toStringList(alg.statements);
+  end toString;
+
   annotation(__OpenModelica_Interface="frontend");
 end NFAlgorithm;

Compiler/NFFrontEnd/NFEquation.mo

@@ -60,14 +60,15 @@ public
 
     function toString
       input Branch branch;
+      input String indent = "";
       output String str;
     algorithm
       str := match branch
         case BRANCH()
-          then Expression.toString(branch.condition) + " then\n" + toStringList(branch.body);
+          then Expression.toString(branch.condition) + " then\n" + toStringList(branch.body, indent + "  ");
 
         case INVALID_BRANCH()
-          then toString(branch.branch);
+          then toString(branch.branch, indent);
       end match;
     end toString;
 
@@ -643,63 +644,67 @@ public
 
   function toString
     input Equation eq;
+    input String indent = "";
     output String str;
   algorithm
     str := match eq
       local
         String s1, s2;
 
       case EQUALITY()
-        then Expression.toString(eq.lhs) + " = " + Expression.toString(eq.rhs);
+        then indent + Expression.toString(eq.lhs) + " = " + Expression.toString(eq.rhs) + ";";
 
       case CREF_EQUALITY()
-        then ComponentRef.toString(eq.lhs) + " = " + ComponentRef.toString(eq.rhs);
+        then indent + ComponentRef.toString(eq.lhs) + " = " + ComponentRef.toString(eq.rhs) + ";";
 
       case ARRAY_EQUALITY()
-        then Expression.toString(eq.lhs) + " = " + Expression.toString(eq.rhs);
+        then indent + Expression.toString(eq.lhs) + " = " + Expression.toString(eq.rhs) + ";";
 
       case CONNECT()
-        then "connect(" + Expression.toString(eq.lhs) + ", " + Expression.toString(eq.rhs) + ")";
+        then indent + "connect(" + Expression.toString(eq.lhs) + ", " + Expression.toString(eq.rhs) + ");";
 
       case FOR()
         algorithm
           s1 := if isSome(eq.range) then " in " + Expression.toString(Util.getOption(eq.range)) else "";
-          s2 := toStringList(eq.body);
+          s2 := toStringList(eq.body, indent + "  ");
         then
-          "for " + InstNode.name(eq.iterator) + s1 + " loop\n" + s2 + "end for";
+          indent + "for " + InstNode.name(eq.iterator) + s1 + " loop\n" + s2 + indent + "end for;";
 
       case IF()
-        then "if " + Branch.toString(listHead(eq.branches)) +
-             List.toString(listRest(eq.branches), Branch.toString, "", "elseif ", "\nelseif ", "", false) +
-             "\nend if";
+        then indent + "if " + Branch.toString(listHead(eq.branches)) +
+             List.toString(listRest(eq.branches), function Branch.toString(indent = indent), "",
+                           indent + "elseif ", "\n" + indent + "elseif ", "", false) +
+             indent + "end if;";
 
       case WHEN()
-        then "when " + Branch.toString(listHead(eq.branches)) +
-             List.toString(listRest(eq.branches), Branch.toString, "", "elsewhen ", "\nelsewhen ", "", false) +
-             "\nend when";
+        then indent + "when " + Branch.toString(listHead(eq.branches)) +
+             List.toString(listRest(eq.branches), function Branch.toString(indent = indent), "",
+                           indent + "elsewhen ", "\n" + indent + "elsewhen ", "", false) +
+             indent + "end when;";
 
       case ASSERT()
         then "assert(" + Expression.toString(eq.condition) + ", " +
-             Expression.toString(eq.message) + ", " + Expression.toString(eq.level) + ")";
+             Expression.toString(eq.message) + ", " + Expression.toString(eq.level) + ");";
 
       case TERMINATE()
-        then "terminate( " + Expression.toString(eq.message) + ")";
+        then "terminate( " + Expression.toString(eq.message) + ");";
 
       case REINIT()
-        then "reinit(" + Expression.toString(eq.cref) + ", " + Expression.toString(eq.reinitExp) + ")";
+        then "reinit(" + Expression.toString(eq.cref) + ", " + Expression.toString(eq.reinitExp) + ");";
 
       case NORETCALL()
-        then Expression.toString(eq.exp);
+        then Expression.toString(eq.exp) + ";";
 
       else "#UNKNOWN EQUATION#";
     end match;
   end toString;
 
   function toStringList
     input list<Equation> eql;
+    input String indent = "";
     output String str;
   algorithm
-    str := List.toString(eql, toString, "", "  ", "\n  ", "", false) + "\n";
+    str := List.toString(eql, function toString(indent = indent), "", "", "\n", "", false) + "\n";
   end toStringList;
 
 annotation(__OpenModelica_Interface="frontend");

Compiler/NFFrontEnd/NFFlatModel.mo

@@ -34,7 +34,15 @@ encapsulated uniontype NFFlatModel
   import Algorithm = NFAlgorithm;
   import Variable = NFVariable;
 
+protected
+  import Statement = NFStatement;
+  import IOStream;
+
+  import FlatModel = NFFlatModel;
+
+public
   record FLAT_MODEL
+    String name;
     list<Variable> variables;
     list<Equation> equations;
     list<Equation> initialEquations;
@@ -43,5 +51,59 @@ encapsulated uniontype NFFlatModel
     Option<SCode.Comment> comment;
   end FLAT_MODEL;
 
+  function toString
+    input FlatModel flatModel;
+    output String str;
+  protected
+    IOStream.IOStream s;
+  algorithm
+    s := IOStream.create(getInstanceName(), IOStream.IOStreamType.LIST());
+
+    s := IOStream.append(s, "class " + flatModel.name + "\n");
+    s := toString2(flatModel.variables, function Variable.toString(indent = "  "), "", s);
+    s := toString2(flatModel.initialEquations, function Equation.toString(indent = "  "), "initial equation", s);
+    s := toString2(flatModel.equations, function Equation.toString(indent = "  "), "equation", s);
+
+    for alg in flatModel.initialAlgorithms loop
+      s := toString2(alg.statements, function Statement.toString(indent = "  "), "initial algorithm", s);
+    end for;
+
+    for alg in flatModel.algorithms loop
+      s := toString2(alg.statements, function Statement.toString(indent = "  "), "algorithm", s);
+    end for;
+
+    s := IOStream.append(s, "end " + flatModel.name + ";\n");
+
+    str := IOStream.string(s);
+    IOStream.delete(s);
+  end toString;
+
+protected
+  function toString2<T>
+    input list<T> elements;
+    input FuncT toStringFunc;
+    input String header;
+    input output IOStream.IOStream s;
+
+    partial function FuncT
+      input T element;
+      output String str;
+    end FuncT;
+  algorithm
+    if listEmpty(elements) then
+      return;
+    end if;
+
+    if not stringEmpty(header) then
+      s := IOStream.append(s, header);
+      s := IOStream.append(s, "\n");
+    end if;
+
+    for e in elements loop
+      s := IOStream.append(s, toStringFunc(e));
+      s := IOStream.append(s, "\n");
+    end for;
+  end toString2;
+
   annotation(__OpenModelica_Interface="frontend");
 end NFFlatModel;

Compiler/NFFrontEnd/NFFlatten.mo

@@ -145,9 +145,9 @@ algorithm
         alg := listReverseInPlace(sections.algorithms);
         ialg := listReverseInPlace(sections.initialAlgorithms);
       then
-        FlatModel.FLAT_MODEL(vars, eql, ieql, alg, ialg, cmt);
+        FlatModel.FLAT_MODEL(name, vars, eql, ieql, alg, ialg, cmt);
 
-    else FlatModel.FLAT_MODEL(vars, {}, {}, {}, {}, cmt);
+      else FlatModel.FLAT_MODEL(name, vars, {}, {}, {}, {}, cmt);
   end match;
 
   execStat(getInstanceName() + "(" + name + ")");

Compiler/NFFrontEnd/NFStatement.mo

@@ -420,58 +420,60 @@ public
 
   function toString
     input Statement stmt;
+    input String indent = "";
     output String str;
   algorithm
     str := match stmt
       local
         String s1, s2;
 
       case ASSIGNMENT()
-        then Expression.toString(stmt.lhs) + " := " + Expression.toString(stmt.rhs);
+        then indent + Expression.toString(stmt.lhs) + " := " + Expression.toString(stmt.rhs) + ";";
 
       case FUNCTION_ARRAY_INIT()
-        then "array init " + stmt.name;
+        then indent + "array init " + stmt.name;
 
       case FOR()
         algorithm
           s1 := if isSome(stmt.range) then " in " + Expression.toString(Util.getOption(stmt.range)) else "";
-          s2 := toStringList(stmt.body);
+          s2 := toStringList(stmt.body, indent + "  ");
         then
-          "for " + InstNode.name(stmt.iterator) + s1 + " loop\n" + s2 + "end for";
+          indent + "for " + InstNode.name(stmt.iterator) + s1 + " loop\n" + s2 + indent + "end for;";
 
       case IF()
-        then branchString(listHead(stmt.branches), "if", true) +
-             stringDelimitList(list(branchString(b, "if", false) for b in listRest(stmt.branches)), "\n") +
-             "\nend if";
+        then branchString(listHead(stmt.branches), "if", indent, true) +
+             stringDelimitList(list(branchString(b, "if", indent, false) for b in listRest(stmt.branches)), "\n") +
+             indent + "end if;";
 
       case WHEN()
-        then branchString(listHead(stmt.branches), "when", true) +
-             stringDelimitList(list(branchString(b, "when", false) for b in listRest(stmt.branches)), "\n") +
-             "\nwhen if";
+        then branchString(listHead(stmt.branches), "when", indent, true) +
+             stringDelimitList(list(branchString(b, "when", indent, false) for b in listRest(stmt.branches)), "\n") +
+             indent + "when if;";
 
       case ASSERT()
-        then "assert(" + Expression.toString(stmt.condition) + ", " +
-             Expression.toString(stmt.message) + ", " + Expression.toString(stmt.level) + ")";
+        then indent + "assert(" + Expression.toString(stmt.condition) + ", " +
+             Expression.toString(stmt.message) + ", " + Expression.toString(stmt.level) + ");";
 
       case TERMINATE()
-        then "terminate( " + Expression.toString(stmt.message) + ")";
+        then indent + "terminate( " + Expression.toString(stmt.message) + ");";
 
       case NORETCALL()
-        then Expression.toString(stmt.exp);
+        then indent + Expression.toString(stmt.exp) + ";";
 
       case WHILE()
-        then "while " + Expression.toString(stmt.condition) + " then\n" +
-             toStringList(stmt.body) + "\nend while";
+        then indent + "while " + Expression.toString(stmt.condition) + " then\n" +
+             toStringList(stmt.body, indent + "  ") + "\nend while;";
 
-      case RETURN() then "return";
-      case BREAK() then "break";
-      else "#UNKNOWN STATEMENT#";
+      case RETURN() then indent + "return;";
+      case BREAK() then indent + "break;";
+      else indent + "#UNKNOWN STATEMENT#";
     end match;
   end toString;
 
   function branchString
     input tuple<Expression, list<Statement>> branch;
     input String stmtType;
+    input String indent;
     input Boolean firstBranch;
     output String str;
   protected
@@ -480,15 +482,16 @@ public
   algorithm
     (cond, body) := branch;
 
-    str := (if firstBranch then stmtType elseif Expression.isTrue(cond) then "else" else "else" + stmtType) +
-           " " + Expression.toString(cond) + "then\n" + toStringList(body);
+    str := indent + (if firstBranch then stmtType elseif Expression.isTrue(cond) then "else" else "else" + stmtType) +
+      " " + Expression.toString(cond) + " then\n" + toStringList(body, indent + "  ");
   end branchString;
 
   function toStringList
     input list<Statement> stmtl;
+    input String indent = "";
     output String str;
   algorithm
-    str := List.toString(stmtl, toString, "", " " , "\n  ", "", false) + "\n";
+    str := List.toString(stmtl, function toString(indent = indent), "", "", "\n", "", false) + "\n";
   end toStringList;
 
 annotation(__OpenModelica_Interface="frontend");

Compiler/NFFrontEnd/NFVariable.mo

@@ -41,6 +41,7 @@ encapsulated uniontype NFVariable
 
 protected
   import Variable = NFVariable;
+  import IOStream;
 
 public
   record VARIABLE
@@ -89,5 +90,55 @@ public
     output Boolean isEmpty = Type.isEmptyArray(variable.ty);
   end isEmptyArray;
 
+  function toString
+    input Variable var;
+    input String indent = "";
+    output String str;
+  protected
+    IOStream.IOStream s;
+    Boolean first;
+  algorithm
+    s := IOStream.create(getInstanceName(), IOStream.IOStreamType.LIST());
+
+    s := IOStream.append(s, indent);
+
+    if var.visibility == Visibility.PROTECTED then
+      s := IOStream.append(s, "protected ");
+    end if;
+
+    s := IOStream.append(s, Component.Attributes.toString(var.attributes, var.ty));
+    s := IOStream.append(s, Type.toString(var.ty));
+    s := IOStream.append(s, " ");
+    s := IOStream.append(s, ComponentRef.toString(var.name));
+
+    if not listEmpty(var.typeAttributes) then
+      s := IOStream.append(s, "(");
+
+      first := true;
+      for a in var.typeAttributes loop
+        if first then
+          first := false;
+        else
+          s := IOStream.append(s, ", ");
+        end if;
+
+        s := IOStream.append(s, Util.tuple21(a));
+        s := IOStream.append(s, " = ");
+        s := IOStream.append(s, Binding.toString(Util.tuple22(a)));
+      end for;
+
+      s := IOStream.append(s, ")");
+    end if;
+
+    if Binding.isBound(var.binding) then
+      s := IOStream.append(s, " = ");
+      s := IOStream.append(s, Binding.toString(var.binding));
+    end if;
+
+    s := IOStream.append(s, ";");
+    str := IOStream.string(s);
+    IOStream.delete(s);
+  end toString;
+
   annotation(__OpenModelica_Interface="frontend");
 end NFVariable;