Parse the variable part to AST

source/Parser.def

@@ -46,6 +46,8 @@ TYPE
   PPAstTypeDeclaration = POINTER TO PAstTypeDeclaration;
 
   AstVariableDeclaration = RECORD
+    variable_name: Identifier;
+    variable_type: PAstTypeExpression
   END;
   PAstVariableDeclaration = POINTER TO AstVariableDeclaration;
   PPAstVariableDeclaration = POINTER TO PAstVariableDeclaration;
@@ -58,7 +60,7 @@ TYPE
   PAstModule = POINTER TO AstModule;
 
 PROCEDURE parse_type_expression(lexer: PLexer): PAstTypeExpression;
-PROCEDURE parse_type_declaration(lexer: PLexer): PAstTypeDeclaration;
 PROCEDURE parse_type_part(lexer: PLexer): PPAstTypeDeclaration;
+PROCEDURE parse_variable_part(lexer: PLexer): PPAstVariableDeclaration;
 
 END Parser.

source/Parser.mod

@@ -272,4 +272,56 @@ BEGIN
 
   RETURN result
 END parse_type_part;
+PROCEDURE parse_variable_declaration(lexer: PLexer): PAstVariableDeclaration;
+VAR
+  token: LexerToken;
+  result: PAstVariableDeclaration;
+BEGIN
+  ALLOCATE(result, TSIZE(AstVariableDeclaration));
+
+  token := lexer_current(lexer);
+  result^.variable_name := token.identifierKind;
+
+  token := transpiler_lex(lexer);
+
+  token := transpiler_lex(lexer);
+  result^.variable_type := parse_type_expression(lexer);
+
+  token := transpiler_lex(lexer);
+  RETURN result
+END parse_variable_declaration;
+PROCEDURE parse_variable_part(lexer: PLexer): PPAstVariableDeclaration;
+VAR
+  token: LexerToken;
+  result: PPAstVariableDeclaration;
+  current_declaration: PPAstVariableDeclaration;
+  declaration_count: CARDINAL;
+BEGIN
+  token := lexer_current(lexer);
+
+  ALLOCATE(result, TSIZE(PAstVariableDeclaration));
+  current_declaration := result;
+  declaration_count := 0;
+
+  IF token.kind = lexerKindVar THEN
+    token := transpiler_lex(lexer);
+
+    WHILE token.kind = lexerKindIdentifier DO
+      INC(declaration_count);
+
+      REALLOCATE(result, TSIZE(PAstVariableDeclaration) * (declaration_count + 1));
+      current_declaration := result;
+      INC(current_declaration, TSIZE(PAstVariableDeclaration) * (declaration_count - 1));
+
+      current_declaration^ := parse_variable_declaration(lexer);
+      token := transpiler_lex(lexer)
+    END
+  END;
+  IF declaration_count <> 0 THEN
+    INC(current_declaration, TSIZE(PAstVariableDeclaration))
+  END;
+  current_declaration^ := NIL;
+
+  RETURN result
+END parse_variable_part;
 END Parser.

source/Transpiler.mod

@@ -12,9 +12,9 @@ FROM Lexer IMPORT Lexer, LexerToken, lexer_current, lexer_lex, LexerKind;
 FROM Parser IMPORT AstModule, PAstModule, AstTypeExpressionKind,
   AstConstantDeclaration, PPAstConstantDeclaration,
   AstTypeDeclaration, PAstTypeDeclaration, PPAstTypeDeclaration,
-  AstVariableDeclaration, PPAstVariableDeclaration,
+  PAstVariableDeclaration, PPAstVariableDeclaration,
-  PAstTypeExpression, AstTypeExpression, PPAstTypeExpression, AstFieldDeclaration, PAstFieldDeclaration,
+  PAstTypeExpression, PPAstTypeExpression, AstFieldDeclaration, PAstFieldDeclaration,
-  parse_type_expression, parse_type_declaration, parse_type_part;
+  parse_type_expression, parse_variable_part, parse_type_part;
 
 (* Calls lexer_lex() but skips the comments. *)
 PROCEDURE transpiler_lex(lexer: PLexer): LexerToken;
@@ -131,7 +131,9 @@ BEGIN
   WriteString(context^.output, 'MODULE ');
 
   (* Write the module name and end the line with a semicolon and newline. *)
-  token := transpiler_lex(context^.lexer);
+  IF token.kind <> lexerKindProgram THEN
+    token := transpiler_lex(context^.lexer);
+  END;
   transpile_module_name(context);
 
   token := transpiler_lex(context^.lexer);
@@ -145,7 +147,9 @@ BEGIN
   result^.constants := transpile_constant_part(context);
   result^.types := parse_type_part(context^.lexer);
   transpile_type_part(context, result^.types);
-  result^.variables := transpile_variable_part(context);
+
+  result^.variables := parse_variable_part(context^.lexer);
+  transpile_variable_part(context, result^.variables);
 
   transpile_procedure_part(context);
   transpile_statement_part(context);
@@ -316,40 +320,34 @@ BEGIN
     WriteLine(context^.output)
   END
 END transpile_type_part;
-PROCEDURE transpile_variable_declaration(context: PTranspilerContext);
+PROCEDURE transpile_variable_declaration(context: PTranspilerContext; declaration: PAstVariableDeclaration);
 VAR
-  token: LexerToken;
+  written_bytes: CARDINAL;
-  type_expression: PAstTypeExpression;
 BEGIN
   WriteString(context^.output, '  ');
-  token := lexer_current(context^.lexer);
+  written_bytes := WriteNBytes(context^.output, ORD(declaration^.variable_name[1]), ADR(declaration^.variable_name[2]));
-  write_current(context^.lexer, context^.output);
 
-  token := transpiler_lex(context^.lexer);
   WriteString(context^.output, ': ');
-  token := transpiler_lex(context^.lexer);
+
-  type_expression := parse_type_expression(context^.lexer);
+  transpile_type_expression(context, declaration^.variable_type);
-  transpile_type_expression(context, type_expression);
-  token := transpiler_lex(context^.lexer);
   write_semicolon(context^.output)
 END transpile_variable_declaration;
-PROCEDURE transpile_variable_part(context: PTranspilerContext): PPAstVariableDeclaration;
+PROCEDURE transpile_variable_part(context: PTranspilerContext; declarations: PPAstVariableDeclaration);
 VAR
-  token: LexerToken;
+  current_declaration: PPAstVariableDeclaration;
 BEGIN
-  token := lexer_current(context^.lexer);
+  IF declarations^ <> NIL THEN
-
-  IF token.kind = lexerKindVar THEN
     WriteString(context^.output, 'VAR');
     WriteLine(context^.output);
-    token := transpiler_lex(context^.lexer);
 
-    WHILE token.kind = lexerKindIdentifier DO
+    current_declaration := declarations;
-      transpile_variable_declaration(context);
+    WHILE current_declaration^ <> NIL DO
-      token := transpiler_lex(context^.lexer)
+      transpile_variable_declaration(context, current_declaration^);
-    END
+
-  END;
+      INC(current_declaration, TSIZE(PAstVariableDeclaration))
-  RETURN NIL
+    END;
+    WriteLine(context^.output)
+  END
 END transpile_variable_part;
 PROCEDURE transpile_procedure_heading(context: PTranspilerContext): LexerToken;
 VAR
@@ -593,7 +591,9 @@ VAR
 BEGIN
   token := transpile_procedure_heading(context);
   seen_constants := transpile_constant_part(context);
-  seen_variables := transpile_variable_part(context);
+
+  seen_variables := parse_variable_part(context^.lexer);
+  transpile_variable_part(context, seen_variables);
   transpile_statement_part(context);
 
   WriteString(context^.output, 'END ');